Patent Application
20150033496
Embodiments of the present invention are generally related to a surface treatment apparatus, such as for cleaning a floor. More specifically, one embodiment of the present invention is a floor treatment apparatus that provides a standing or sitting location for the operator and can operate in tight spaces.
Embodiments of the present invention also generally relate to floor cleaning apparatus that employ a sweeper or scrubber assembly that possess a vacuum's ability to capture small particles and/or debris and/or fluid that produces a lower noise output than typical commercially available apparatus.
Embodiments of the present invention are also generally related to floor cleaning machines. More specifically, one embodiment of the present invention is a floor cleaning machine that includes a steering mechanism with a flexible portion. The flexible portion accommodates movement of a housing to which it is associated to allow easy access to interior portions of the device.
Cleaning machines are used extensively for cleaning flooring surfaces comprised of tile, stone, brick, wood, concrete, carpets and other common surfaces. Maintaining the cleanliness of these surfaces, especially in high volume areas in commercial, industrial, institutional and public buildings is an ongoing and time consuming process. The present invention relates to a highly maneuverable floor cleaning or treatment apparatus (“treatment apparatus”) that supports an operator during use. More specifically, some embodiments of the present invention are adapted to clean, sweep, vacuum, burnish, wax, etc. (“treat”) a floored surface, wherein the operator is supported by the cleaning device increasing efficiency and productivity of the cleaning operation. As used, “floored surface”, or more generally “surface”, encompasses areas covered by concrete, tile, carpet, wood, plastic, stone, turf or any other substance known in the art. The prior devices address many issues that arise with cleaning such floored surfaces. Before the present invention, no one device could address many, if not all, of the issues that arise in cleaning various surfaces in various environments at any point in time.
In the past, building maintenance staff and others often treat surfaces, such as tiled hallways or restroom floors, using traditional mop and bucket techniques. The bucket may include a detachable mop ringer and may be positioned on caster wheels to facilitate easy movement. Depending on the cleanliness of the equipment, a worker may make a good start in treating a floor using the mop and bucket approach. However, soon the mop and fluid in the bucket becomes soiled or otherwise contaminated by germs and/or bacteria. From that point on, each time the worker plunges the mop into the bucket and rings the mop, both the mop and cleaning fluid become more dirty/contaminated.
The basic cleaning problems associated with the prior art mop & bucket approach to cleaning surfaces have generally been addressed in the art, as shown in U.S. Pat. No. 6,206,980 to Robinson, entitled “Multi-functional Cleaning Machine,” which is fully incorporated herein by reference. This type of cleaning machine includes a manually propelled wheeled body with two tanks, one concentrated chemical receptacle, a vacuum and blower motor and a fluid pumping system. Typically, such equipment includes only a single motor used for both vacuuming soiled fluid and blowing air that can dry a cleaned surface. While such equipment is maneuverable and is an improvement over the earlier mop and bucket technology, the system is still labor intensive and slow. Productivity of cleaning professionals, when using these types of systems is decreased over what it might be with other types of systems that are available.
Productivity concerns have been addressed in the art by the creation of certain walk behind floor treatment apparatus. These apparatus typically have a scrub deck at the machine's front and a squeegee at its rear. The squeegee has the ability to “swing” or follow the path of the scrub deck as the machine changes direction. This type of equipment is more efficient in cleaning large surface areas than either the mop and bucket or the manually propelled devices. However, the distance between the scrub deck and squeegee is relatively great. Also, walk behinds typically have relatively wide squeegees. These characteristics limit such machine's maneuverability and limit the doorways they can easily pass through. Typical 3′ doorway allows a machine with no more than a 33″ squeegee to fit through without removal.
Small walk behind floor cleaning apparatus typically include a scrub deck in the middle of the machine and squeegees at the machine's rear. In this configuration the squeegee has little or no ability to swing or follow the path of the scrub deck as the machine changes direction. Small rider scrubbers typically have relatively narrow squeegees, and rely on “side squeegees” (unvacuumized squeegee blades) adjacent to the scrub deck to direct the water into the path of the main (vacuumized) squeegee. The problem with these side squeegees is they do not perform well for long and leave a film of water in turns because the vacuumized squeegee does not follow the true path of the scrub deck, only the path of the side squeegees (which leave the film of water). Finally, side squeegee are typically heavy rubber blades and have significant down pressure applied to them to direct the water this makes them expensive and causes significant “drag” which increases the work for the propel unit and limits battery run time. While more maneuverable than larger walk behind floor treatment machines, the small machines rarely clean as well as the larger machines.
Further, known cleaning machines do not provide adequate onboard storage for cleaning supplies, tools, etc. Likewise, prior art machines rarely provide a flexible approach to adding storage facilities for trash and the like when the need for such arises. Machinery that addresses these issues is therefore needed.
Self-propelled cleaning devices are generally also well known in the field and are employed to treat large floored surfaces, such as tiled, concrete or carpeted floors found in hospitals, department stores, schools, gyms, etc. These devices provide the operator with seating from which he/she can control operation of the device. These devices are ideal for cleaning large, open areas because they can contain large amounts of waste fluids and/or debris without having to repeatedly perform time consuming fluid replacement or debris removal. Because these devices provide the user with seating, the user does not become prematurely fatigued, increasing overall worker productivity. These large ride-on machines are not particularly well-suited for cleaning smaller, more confined floor surfaces, which are often found in hallways, small rooms, or even large rooms which have many obstacles.
As is known in the art, smaller self-propelled cleaning devices are also in existence that are ideal for cleaning the smaller rooms and hallways. However, smaller devices are usually pushed or pulled by an operator. Hence, the major drawback of these devices is they often rely on operator strength to maneuver the device. Even if the device is self-propelled, it often employs manual steering. After a long shift of walking behind a treatment device, the operator is bound to become fatigued, wherein his or her attention will deviate from the task at hand, possibly resulting in uneven treatment to the floored area. Thus, a subsequent crew may have to return and retouch certain areas not accurately treated during the first operation. Human errors related to the time a surface is exposed to a brush, may occur when the operator lingers over a single area for extended period of time. This situation is never good for a floor surface. The devices in the art are also difficult to maneuver and often are not adapted to operate around tight corners, wherein pre or post cleaning operations must be performed, thus increasing the time and expense of the entire task.
As known in the art, floor cleaning apparatus are comprised of a chassis supported by a plurality of wheels, one of which is steerable to control the path of the machine. The chassis also accommodates a cleaning assembly, such as a brush, a sweeper, a squeegee, a burnisher, etc. The chassis also supports tanks used to hold water, cleaning fluids, and spent cleaning fluids suctioned from the surface being cleaned. Floor cleaning apparatus also often possess a receptacle or bag for holding collected dust and debris. The majority of the components associated with the cleaning machine are surrounded by at least one housing that protects the internal components from the environment and prevents individuals working around the machine from touching the often hot internal components. As floor cleaning apparatus are sometimes used in tight spaces, such as bathrooms and hallways, it is often desirable to make floor cleaning apparatus as compact as possible.
It is also desirable to provide floor cleaning machines that allow for easy access to internal componentry for maintenance and repair. The desire for easy access is often at odds with the desire to provide a compact apparatus. Prior art machines are constructed so the internal volume is minimized, providing a compact machine, but leaving virtually no easy access to internal componentry. To address this disadvantage, some prior art machines utilize removable segments to the housing that cover internal components. Often, however, external components, such as steering wheels, control panels, external storage tanks, etc., must be removed prior to removal of these housing segments. Removal of the external componentry and the housing segments technology is time consuming, costly, and increases the chance that the machine will be damaged or a component of the machine will be lost.
Some known floor cleaning apparatus also employ a rotating sweeper broom (“sweeper”) to lift debris from a floor. Generally, a cylindrical sweeper rotates about an axis parallel to the floor and which may be located between front and rear wheels of the apparatus. Floor cleaning apparatus also typically include a vacuum system that establishes a directional airstream adjacent to the broom to direct debris into a hopper where heavier debris is precipitated from the airstream. Lighter debris, especially dust, is then typically directed to a vacuum bag.
To enhance the suctioning effect provided by the vacuum, the sweeper may be in a housing situated between the front and rear wheels. The housing typically includes one or more flaps or seals that surround the sweeper that defines a skirt with a lower edge that contacts the floor. The flaps or seals are flexible or hinged to the chassis to allow debris to enter the assembly and be swept up by the sweeper. The flaps or seals also prevent the sweeper from throwing debris and dust as it rotates.
Some other floor cleaning apparatus treat the floor with a cleaning solution with at least one scrubber brush. In some apparatus, the cleaning solution is deposited onto the floor and a pair of rotating disk brushes are used to scrub the floor. Wastewater, which includes entrained debris, is then typically suctioned by a vacuum squeegee located behind or adjacent to the brushes.
One example of a floor cleaning apparatus is disclosed in U.S. Pat. No. 5,093,955 to Blehert et al. (“Blehert I”) entitled “Combined Sweeper and Scrubber.”Blehert I discloses a floor cleaning apparatus that can be set either to a sweeper mode or a scrubbing mode. Blehert I provides a single cylindrical rotary brush, a brush housing mounted on a frame, a solution tank and a removable debris hopper. When in the sweeping mode, a vacuum operating with an air circuit draws air from around the brush and through a filter. When in a scrubbing mode, the vacuum operates to recover dirty scrubbing solution from the rear of the apparatus through a squeegee located aft of the brush.
U.S. Pat. No. 6,041,471 to Charky et al. (“Charky”) entitled “Mobile Walk-Behind Sweeper” discloses a mobile sweeper for cleaning dust and collecting garbage from surfaces. Charky employs a plurality of brushes that direct dust to a collection point where a vacuum blower suctions the debris into a collection container.
U.S. Pat. No. 4,819,676 to Blehert et al. (“Blehert II”) entitled “Combination Sweeping and Scrubbing System and Method,” discloses an apparatus that comprises a sweeping assembly that can be converted into a scrubbing unit and vice versa. The sweeping assembly includes a removable hopper. Cylindrical brushes are also provided that operate in either the sweeping or scrubbing mode.
U.S. Pat. No. 4,580,313 to Blehert (“Blehert III”) entitled “Walk Behind Floor Maintenance Machine” discloses a floor treatment apparatus that has a plurality of wheels, a removal hopper, and a rotatable brush. A removable filter housing is also contemplated and has a prismatic shape. The design of the filter housing is such that a means for vibrating the filter is needed to dislodge particles. The cylindrical brushes of Blehert III are not enclosed within the housing.
Thus it is a long felt need to provide a floor treatment apparatus that employs one or more of the inventions set forth herein.
It is one aspect of the present invention to provide a floor treatment apparatus that is easy to maneuver. More specifically, one embodiment of the present invention is constructed of a chassis section that includes an enclosure that houses at least a portion of the internal components of the treatment device and a location for installation of devices used during cleaning operations. One embodiment of the present invention provides a standing, leaning or sitting location for the operator. Another embodiment of the present invention is equipped with a powered steering device that allows for greater maneuverability in areas with tight corners, ensuring that more flooring surface is treated without having to perform pre- or post-treatment operations. More specifically, one embodiment of the present invention is equipped with a self-propelled wheel and an easy to use steering device to provide increased maneuverability around obstacles. One embodiment of the present invention employs at least one wheel that provides thrust and/or steering capability. Yet another embodiment of the present invention employs wheels that are substantially centered under the chassis such that the entire apparatus is generally capable of 360° rotation without substantially traversing in any other direction, thus allowing it to treat tight corners of a surface. It is another aspect of the present invention to provide a cleaning apparatus that is cost effective to manufacture. Various aspects of the invention shall now be described in more detail.
The floor treatment apparatus includes a housing that protects and houses the internal workings of the apparatus. The housing is supported by a chassis that also provides a location for interconnection of auxiliary treatment devices used to treat a floor. One embodiment of the present invention employs a housing constructed of rigid plastic, metal, or other common materials used in the art. The chassis of this embodiment also supports an operator platform. Alternative embodiments of the present invention employ a foldable, removable or stationary operator seat supported by the chassis. Other safety features such as pads or safety belts may be employed, which makes the working environment safer and more comfortable.
It is yet another aspect of the present invention is a floor treatment apparatus that provides a housing and chassis with a small envelope. More specifically, one embodiment of the present invention is small enough to fit into and through tight spaces. Often facilities that employ the apparatus of the present invention include narrow doorways, aisles, and elevators. Further, some older buildings retrofitted to comply with the Americans with Disabilities Act have elevators of minimal volume and lifting capability. To fit into small elevators, the housing and chassis is designed to have the smallest practical envelope, a distinct advantage over the prior art. Also, the apparatus of one embodiment of the present invention includes components that are easily removable or adjustable to reduce the profile of the apparatus. The embodiments of the present invention may be used in various structures.
The housing of one embodiment houses a fluid pump assembly and a vacuum assembly. The housing also may conceal at least two tanks, one for retaining a base cleaning fluid, such as water, and a second for retaining spent cleaning solution, dry debris, etc. The apparatus may also include one or more concentrated cleaning chemical receptacles designed to hold concentrated cleaning chemicals. The receptacles are preferably stored within a lockable housing, adding safety to the overall apparatus. These agents can be added to a base cleaning fluid just prior to application to a surface and as desired to facilitate cleaning of various surfaces.
Indeed, the internal components of the floor cleaning machine, such as pumps, vacuums, storage tanks, tubes, electrical hardware, batteries, etc. can all be stored within a housing of some embodiments, which generally defines the outer envelope of the floor cleaning device. The housing can direct cooling air around certain components of the floor cleaning device, protects individuals from gaining accidental access to hazardous areas of the floor cleaning device and protects internal components of the floor cleaning device from environmental damage. In one embodiment of the present invention, the housing may be comprised of a primary housing directly interconnected to the chassis. The primary housing may have a plurality of removable segments that allow selective access to the interior of the floor cleaning device or may be of one piece construction that surrounds all internal components of the floor cleaning machine. The primary housing may be removable from the chassis in many ways known in the art. A front housing may be rotatably interconnected to at least one of the primary housing or the chassis and is capable of transitioning away from the primary housing or chassis to allow access to internal components covered thereby, both from above and from the front of the floor cleaning machine. Finally, a rear housing may be provided that may also be rotatably interconnected to the chassis and/or primary housing. The housing segment may also be selectively rotatable from the primary housing to allow access to internal components covered thereby, both from the rear and top of the floor cleaning machine. The front housing of one embodiment of the present invention accommodates various controls associated with the floor cleaning machine. These controls may indicate the cleaning and spent fluid in the tanks, control power, battery life, etc.
The rear housing of one embodiment of the present invention may accommodate a tank that stores at least one of clean water or waste water. In one embodiment, the tank is capped prior to rotating it away from the primary housing to avoid spillage of the tank contents. One advantage of some embodiments of the present invention described, is that a compact floor cleaning machine is provided that allows for easy and selective access to internal components of the machine without having to remove the machine housing, a timely and costly process.
Another aspect of the present invention is to provide a floor treatment apparatus that is easy to operate and maneuver. More specifically, one embodiment of the present invention is equipped with a steering mechanism that allows for inputs from the operator to be efficiently communicated to the steering wheels of the floor treatment apparatus. Alternatively, other steering means may facilitate maneuverability of the treatment apparatus, such as joy sticks, touch screens, buttons, remote control elements, etc.
It is still yet another aspect of the present invention to provide a floor treatment apparatus adapted to efficiently clean areas with tight corners. More specifically, one embodiment of the present invention is adapted to generally perform 360° turns without appreciable lateral motion. This embodiment of the present invention is equipped with a turning mechanism generally under the center of the chassis with two powered exterior wheels adjacent thereto that provide power to the chassis to pivot around the centered wheel. The powered exterior wheels may be independently controlled by joy sticks, wherein movement thereof sends directional inputs to each wheel. One embodiment of the invention is equipped with at least one joy stick wherein forward deflection will impart forward motion, rearward deflection will impart rearward motion, and a side-to-side deflection will cause the apparatus to turn. Alternatively, two joy sticks may be used in a similar manner, wherein rearward deflection of the left joy stick and forward deflection of the right joy stick will cause a left turn, and depending on the placement of the powered wheels, perhaps a 360° left hand turn.
Another embodiment of the present invention utilizes a steering wheel, handle bars, a yoke, or similar apparatus for steering. Embodiments may also include a power-assisted steering mechanism.
The steering shaft of one embodiment of the present invention can also move as the housing rotates without requiring disconnection from the steering mechanism or removal of the steering wheel. The shaft of one embodiment includes a stationary rigid portion that is slidably interconnected to a flexible portion that selectively slides over the rigid portion and flexes when the front housing is rotated away from the primary housing. In other embodiments, the shaft flexibility alone is enough to provide for needed housing rotation. More specifically, in order to also accommodate the movement of the shaft, a slip fitting is preferably interconnected to the flexible portion to allow the steering shaft to separate from the chassis, by sliding over the rigid portion, while remaining interconnected to the steering mechanism.
It is another aspect of the present invention to provide a floor treatment apparatus powered by commonly used power plants. More specifically, one embodiment of the present invention employs an electric motor to power the apparatus. The electric motor may be powered by batteries, solar energy or an electrical cord attached to a permanent power source. Alternatively, the present invention may be powered by an internal combustion engine. Other propulsion means may also be employed by the present invention without departing from its scope, as appreciated by one skilled in the art.
As briefly mentioned above, preferably at least one tank is provided that provides a solution directed towards the flooring surface to be cleaned to facilitate treatment. The tank may be constructed with multiple compartments wherein waste water from the surface is contained prior to disposal. More specifically, one embodiment of the present invention employs a tank that includes a movable membrane. In this configuration, the clean water and/or cleaning solution is deposited on a surface and agitated. Dirty water is next suctioned up and deposited back into a portion of the tank, thereby moving a membrane accordingly to accept the dirty water. Such a configuration is disclosed in U.S. Pat. No. 4,759,094, which is incorporated in its entirety herein by this reference. A similar selectively expandable fluid storage area can be created by utilizing a collapsible structure, which is placed inside of the primary fluid tank. This type of arrangement is disclosed in U.S. Pat. No. 4,196,492, which is also incorporated herein in its entirety by this reference.
Clean water can come from an outside source such as a hose, rather than be stored on board the device. However, to facilitate maneuverability and usability of the present invention, it is envisioned that the chassis will house or hold at least one fluid tank and perhaps a plurality thereof.
In one type of floor treatment apparatus, fluid from a chemical receptacles flows through a tube to a chemical selector, which may include a metering valve. The selector preferably has a positive shut-off position, wherein fluid is prevented from flowing through the selector regardless of the fluid pressure in a fluid line. The selector responds to input from an operator selection of one of the several cleaning chemicals. Once a chemical is selected, it may flow through the chemical selector and appropriate amounts thereof may be provided to one of many inlets to a mixing tee. The chemical allowed to flow may be adjusted by a metering valve built into the selector or separate from the selector, in a known fashion. A base cleaning fluid, such as water, may flow from a fluid tank and through a separate tube to a second leg of a mixing tee. The cleaning fluid and concentrated cleaning chemical are then mixed within the mixing tee to create a cleaning solution. That solution may then be passed through the selector outlet to a pressure pump, wherein the cleaning solution may be pressurized and communicated via appropriate tubing to a dispensing device. The pump, which draws fluid to and through the selector, also preferably includes a bypass system to facilitate regulation of pump pressure. Use of the pump to draw fluid is preferred as it does not create unwanted pressures in the fluid lines and the system, in general, is not subject to gravity feeding of fluid.
A solution may be applied to a surface using any type of dispensing device. In a preferred embodiment, the dispensing device or associated solution lines or tubes include an adjustable valve, which may adjust the pressure and flow of solution allowed to exit the dispensing device. Because of the adjustability, the apparatus may be utilized as a pre-cleaner for various carpet treatments, including spotting or other treatments.
By use of the chemical selector, two or more receptacles of floor treatment chemicals may be fluidly connected to a mixing tee. In operation, a user can create many cleaning solutions without the need for adding receptacles or switching chemical feed lines from one receptacle to another or without changing metering tips that are easily misplaced, incorrectly interconnected, or damaged. The treatment process is safer because there is less chemical handling. Similarly, use of a metering valve will allow the operator to create a very precise floor treatment solution.
It is preferred that one-way check valves be used throughout the apparatus. For instance, check valves may be included in: delivery lines that supply cleaning chemicals to the metering tee; lines that supply water to the metering tee; lines that supply cleaning solution to the pump; lines that supply cleaning solution to the spray gun; or in the metering tee, itself. The check valves prevent reversal of fluid and prevent contamination of one fluid with another.
The floor treatment apparatus also may include a modular blower assembly. The blower assembly may be hand-held and operate completely apart from the overall floor cleaning machine. The blower assembly may dry areas physically separate from where the apparatus is stored. Because the blower assembly possibly is separate from the apparatus, it may also be used for other blowing functions, such as blowing leaves, grass, dirt or other debris. The blower assembly may be used with a detachable hand nozzle, a flexible nozzle, an extension wand, etc., thereby increasing the overall flexibility of the blower assembly. The blower assembly may utilize an integrated on/off switch and be powered by electricity supplied by any typical extension cord, including the power source of the apparatus. The blower may be configured to be stored on the apparatus in one of many convenient ways. It will be appreciated by one skilled in the art that having a modular blower assembly is very beneficial to the overall functionality of a multifunctional floor treatment apparatus.
Another aspect of one embodiment of the present invention is that the chassis includes bins, trays, bays and other storage devices preferably within easy reach of the operator. The storage devices provide the operator with substantial flexibility when cleaning a large building or area that has many types of surfaces that may need treatment.
Also, the apparatus provides for modular trash/supply bins that may be added to or removed from the apparatus quickly and easily so the machine can be configured for one of many floor treatment activities.
It is yet another aspect of the present invention to provide a floor treatment apparatus equipped with a secondary fluid pump that supplies fluid to the main fluid pump prior to ignition. More specifically, one embodiment of the present invention includes a secondary, or priming pump, which is activated prior to the activation of the main fluid pump. Often it is desirable to introduce fluid into a main fluid pump prior to that pump's activation, expelling trapped air that may cause damage to the main fluid pump motor from vapor lock or cavitation, for example. This priming process may be conducted manually, but that is time consuming, wherein the user manually adds fluid to the pump or bleeds the air therefrom. Alternatively, and preferably, one embodiment of the present invention is equipped with a secondary pump activated for a brief moment when the fluid discharge apparatus is initially activated ensuring the main fluid pump will be substantially free of trapped air upon activation.
It is another aspect of the present invention to provide a floor treatment apparatus that includes a squeegee adjacent to the floor cleaning machine, both generally in the middle of the machine. The squeegee swings, or follows the path of the floor and does not rely on unvacuumized side squeegees to channel water to the main vacuumized squeegee. Thus, it offers as good or better fluid pick-up when the apparatus is turning than is capable with a walk behind scrubber, and far superior than typical small riders since it does not rely on smearing side squeegees. One embodiment of the present invention, employs a squeegee that pivots about the steering axis with a linkage supported by a roller and track mechanism. The absence of side squeegees mean less drag and better use of available energy. In addition, some embodiments of the present invention include an adjustable squeegee, a skirt or a shroud that minimally contacts the floor, thus reducing drag and sparing battery charge. Alternatively, some embodiments of the present invention include stops that contact the floor, without marring the same.
Various aspects of the inventions discussed briefly above combine to provide an effective and efficient tool, useful in the treatment of numerous areas in and around commercial, industrial, institutional and public buildings. Moreover, due to the aspects of the present invention, a sanitation maintenance worker may clean a room or facility more efficiently than previously possible. The present invention may be used in various cleaning operations such as burnishing, vacuuming, scrubbing, sanding, waxing, sweeping, sealing, painting, polishing, etc. To accomplish these tasks, embodiments of the floor treatment apparatus of the present invention may be equipped with various combinations of floor treatment devices or apparatus. More specifically, one embodiment of the present invention is equipped with a plurality of brushes and squeegees to agitate and collect debris from a flooring surface. Suction mechanisms may be employed such that fluids and/or dry particulate matter are transferred into a container. It is also envisioned that one embodiment of the present invention includes at least one solution applicator positioned adjacent to the scrub brushes, wherein solution is injected onto the surface after, or prior to, agitation by the brushes. The debris-entrained solution is then collected by the squeegee and subsequently vacuumed into the holding tank or expelled out of the chassis to an outside reservoir. The brushes and/or solution used in this embodiment may be adapted to clean, sweep, paint, burnish, sand, strip, varnish or wax a floor. It will be appreciated by one skilled in the art that any type of solution adapted to treat any flooring surface may be employed without departing from the scope of the present invention.
It is yet another aspect of the present invention to provide a floor treatment apparatus that can be used in various floor maintenance operations. More specifically, one embodiment of the present invention is adapted for interconnection to a plurality of devices to perform a variety of floor treatment operations. It is envisioned that one embodiment of the present invention be capable of quick removal of certain treatment devices such that different devices may be then added to quickly change the scope of the apparatus, providing a device adapted to scrub, clean carpets, wax floors, burnish floors, remove wax or varnish from floors, vacuum, etc. Thus, it is contemplated, that this system may be used for a plurality of cleaning or floor treatment operations.
It is yet another aspect of the present invention to provide a highly mobile floor treatment apparatus that can include a car washer assembly. As appreciated by those skilled in the art, if so configured, the device could include a car washer wand connected to appropriate pumps and could be utilized to pre-clean heavily soiled areas before final cleaning with the device.
It is still another aspect of the present invention to provide a floor treatment apparatus that does not require direct contact with an operator to perform its tasks. More specifically, one embodiment of the present invention is adapted to be remote controlled. This embodiment of the present invention is equipped with remote control mechanisms and software known in the art, such as taught by U.S. Pat. No. 6,625,843 to Kim et al., which is incorporated in its entirety herein. In addition, this embodiment of the present invention may be equipped with the plurality of cameras such that offsite monitoring and control may be performed. In a related embodiment of the present invention, software is installed in the floor treatment apparatus such that human contact or monitoring is not required. More specifically, one embodiment of the present invention is adapted to learn its environment as it operates in an area such that remote controlling is not required. Alternatively, it is well within the scope of this invention to preprogram the dimension of floored surfaces into the smart treatment device, wherein the device is parameterized with the surface dimensions before the task is initiated. Apparatus are known in the art, such as the Roomba™ device by iRobot Corporation, aspects of which are described in U.S. Pat. Nos. 6,594,844 and 6,535,793, which are both incorporated in their entirety herein.
It is another aspect of the present invention to provide a floor treatment apparatus that is safe and comfortable to use. More specifically, one embodiment of the present invention includes an operator platform. This platform allows the operator to stand on the machine during the treatment operation, thus increasing productivity and lowering the chances of injury or fatigue to the operator. In another embodiment of the present invention, a seat is provided wherein the operator may comfortably sit while completing his or her task. Other safety and comfort features such as rails, pads, and belts, may be provided depending on the needs of the operator.
It is another aspect of the present invention to provide a floor treatment apparatus that employs a scrubber and sweeper assembly (“cleaning assembly”). The cleaning assembly includes a front brush and a rear brush partially enclosed by a housing that, with the aid of a vacuum motor, directs air between the front brush and the second brush and into a hopper. The suction provided by the vacuum motor directs particle- and debris-laden air into the hopper wherein smaller particles are suctioned directly into a vacuum bag. The vacuum pressure provided by the vacuum motor is maintained by a seal or flap associated with the undercarriage of the apparatus. The hopper of one embodiment of the present invention also includes a screen that captures larger particles while allowing dust and smaller particles to pass therethrough to be suctioned into the vacuum bag. The hopper is removable, which allows the user to clear the larger particles from the apparatus.
It is, thus, another aspect of the present invention to provide an apparatus capable of cleaning small particles and large particles. More specifically, the front brush and the rear brush are located under the brush housing. The rear brush is also located near a curved rear wall of the hopper. This configuration allows air and debris to enter the front portion of the cleaning assembly, flow between the rotating brushes, flow behind the curved wall, and flow into the hopper. As one skilled in the art will appreciate, this configuration allows for the capture of particles of various sizes, from the small, i.e., dust, to larger particles of about 0.75 inches. Larger particles of 8 to 10 inches of length may be captured by some embodiments of the present invention. In one embodiment of the present invention, the brushes are cylindrical and rotate about a longitudinal axis parallel to the floor. As mentioned above, a flap or seals may be positioned about the brushes to seal the housing, which enhances suction pressure and facilitates the airflow described above. The flaps may be made of any material, but are preferably made of a compliant material, such as rubber. In one embodiment of the present invention, the rearward flap also functions as a squeegee.
It is another aspect of the present invention to provide a debris tray that also employs a screen that captures larger items. More specifically, the removable debris tray of the hopper of one embodiment of the present invention is tapered wherein a lowermost portion is associated with a vacuum hose associated with the vacuum bag. The hopper also includes a screen that is positioned above the debris tray such that debris-laden air passes through the screen and into the tray, where larger debris will be trapped by the screen and prevented from entering the vacuum hose. As is well known in the art, the smaller debris will be deposited into the vacuum bag. The debris tray is removable, which allows the larger particles to be cleared from the cleaning assembly periodically. The screen prevents jamming of the vacuum hose, which is an advantage over prior art apparatus that did not capture larger debris or that captured larger debris only to inadvertently suck them into the vacuum system, which could damage the vacuum hose, vacuum motor or other components of the system.
It is yet another aspect of the present invention to provide an apparatus that has a retractable attachment hose. More specifically, one embodiment of the present invention includes an auxiliary vacuum hose interconnected to the vacuum bag by way of a valve. In normal operations, vacuum pressure provided by the vacuum motor suctions debris pulled by the cleaning apparatus. Alternatively, when the attachment hose is employed, the valve closes the vacuum hose associated with the cleaning apparatus and provides vacuum pressure to the attachment hose. The attachment hose may be associated with a hose roller that maintains the curvature of the hose to prevent kinking and the associated airflow reduction. Furthermore, some embodiments of the present invention provide a hose with bellows or other elongation mechanisms. In one embodiment of the present invention, the hose roller is actuated when the operator switches the apparatus to the primary floor cleaning mode.
It is thus another aspect of embodiments of the present invention to provide a floor treatment apparatus comprising: a chassis having a front surface, a rear surface, a left surface, a right surface and a lower surface, the chassis supporting a clean fluid tank, a spent fluid tank, an electric drive motor associated with a drive wheel and a plurality of batteries associated with the electric drive motor, and a vacuum motor; wherein the vacuum motor is operably connected to the one or more of the batteries and is part of a vacuum assembly comprising at least one hose running from the vacuum assembly to a member associated with a squeegee, and a second hose running from the vacuum assembly to the spent fluid tank; a first wheel operably interconnected to the lower surface adjacent to the left surface and located closer to the rear surface than the front surface; a second wheel operably interconnected to the lower surface adjacent the right surface and located closer to the rear surface than the front surface; wherein the first wheel and the second wheel are not interconnected; wherein the drive wheel is operably interconnected to the lower surface and located closer to the front surface than the rear surface; a multi-part housing comprising a primary housing, a front housing portion, and a rear housing portion, the multi-part housing having a plurality of hand holds are formed integral with the multi-part housing; wherein at least the primary housing portion is associated with the chassis; a steering wheel operably interconnected by a shaft to an assembly associated with the drive wheel wherein the steering wheel is associated with the front housing portion that hingedly rotates relative to the primary housing, the front housing portion includes a control panel, and the steering wheel maintaining a static position relative to the control panel when the front housing portion is rotated away from the primary housing; wherein the rear housing portion is located adjacent the chassis rear surface and is substantially connected to at least one of the primary housing and the chassis by one or more hinge members such that the rear housing portion hingedly rotates relative to the primary housing about an axis parallel to an axis extending between a center of the first wheel and a center of the second wheel, and one or more of the hinge members are connected closer to the chassis lower surface than to a top portion of the primary housing portion; wherein the spent fluid tank is fixedly connected to the rear housing portion and rotates with the rear housing portion; a platform which is substantially associated with the rear housing portion and located substantially between at least a portion of the right surface of one of the chassis or the multi-part housing and at least a portion of the left surface of one of the chassis or the multi-part housing and extending from at least a portion of the rear surface of one of the chassis or the multi-part housing, wherein a portion of the platform is positioned substantially adjacent to the axis extending between the center of the first wheel and the center of the second wheel and at least a portion of the platform penetrates a three-dimensional cylindrical volume that is defined by an outer surface of the first wheel and the second wheel, and the platform includes at least one of a left sidewall, a right sidewall, and a back wall that extend above a surface that receives an operator's feet; wherein the platform includes a switch in operable communication with a hand operated speed range switch and the electric drive motor, the switch operable to control locomotion of the apparatus within a selected speed range, and an operator presence device which is operatively connected to and which selectively interrupts operation of the switch; a brake which is operative to perform a braking function when the switch is disengaged; a scrub brush, wherein the scrub brush and the squeegee are operably connected to and located substantially adjacent to the lower surface of the chassis; and wherein the apparatus rotates 360 degrees without substantially moving in other directions.
It is another aspect of embodiments of the present invention to provide a floor treatment apparatus comprising: a multi-part enclosure comprising a primary enclosure, a front enclosure portion, and a rear enclosure portion, the multi-part enclosure having front surface, a rear surface, an upper surface, a lower surface, a left surface, and a right surface; a first wheel operably interconnected to the lower surface adjacent to the left surface and located closer to the rear surface than the front surface; a second wheel operably interconnected to the lower surface adjacent the right surface and located closer to the rear surface than the front surface; a platform located closer to the lower surface than the upper surface and substantially between at least a portion of the right surface and at least a portion of the left surface, and extending from a portion of the rear surface, wherein a portion of the platform is positioned substantially adjacent to an axis extending between a center of the first wheel and a center of the second wheel; a floor treatment assembly operably connected to the lower surface of the enclosure; a power source positioned substantially within the enclosure; an electric monowheel drive motor associated with the power source; a third wheel associated with the electric monowheel drive motor and operably connected adjacent the lower surface of the enclosure; a steering mechanism associated with the third wheel; a steering wheel operably interconnected by a shaft to the steering mechanism wherein the steering wheel is associated with the front enclosure portion that hingedly rotates relative to the primary enclosure, the front enclosure portion includes a control panel, and the steering wheel maintaining a static position relative to the control panel when the front enclosure portion is rotated away from the primary enclosure; and wherein the rear enclosure portion is capable of selective rotation about an axis parallel to the axis extending between the center of the first wheel and the center of the second wheel.
It is yet another aspect of embodiments of the present invention to provide a floor treatment apparatus comprising: a multi-part housing comprising a primary housing, a front housing portion, and a rear housing portion, the multi-part housing having front surface, a rear surface, an upper surface, a lower surface, a left surface, and a right surface; a first wheel operably interconnected to the lower surface adjacent to the left surface and located closer to the rear surface than the front surface; a second wheel operably interconnected to the lower surface adjacent the right surface and located closer to the rear surface than the front surface; a platform located closer to the lower surface than the upper surface and substantially between at least a portion of the right surface and at least a portion of the left surface, and extending from a portion of the rear surface, wherein a portion of the platform is positioned substantially proximate to an axis extending between the first wheel and the second wheel; a steering wheel operably interconnected by a shaft to an assembly associated with a drive wheel wherein the steering wheel is associated with the front housing portion that hingedly rotates relative to the primary housing, the front housing portion includes a control panel, and the steering wheel maintaining a static position relative to the control panel when the front housing portion is rotated away from the primary housing; a floor treatment assembly operably connected to a chassis that is associated with the multi-part housing; and wherein the rear housing portion is capable of selective rotation.
It is still yet another aspect of embodiments of the present invention to provide a floor treatment apparatus comprising: a multi-part housing comprising a primary housing, a front housing portion, and a rear housing portion, the multi-part housing having front surface, a rear surface, an upper surface, a lower surface, a left surface, and a right surface; a platform that extends substantially between at least a portion of the right surface, at least a portion of the left surface and at least a portion of the rear surface, the platform having a throttle and an operator presence device operatively connected to and which selectively interrupts operation of the throttle; a third wheel operably connected adjacent the lower surface of the multi-part housing; a steering wheel operably interconnected by a shaft to the steering mechanism wherein the steering wheel is associated with the front housing portion that hingedly rotates relative to the primary housing, the front housing portion includes a control panel, and the steering wheel maintaining a static position relative to the control panel when the front housing portion is rotated away from the primary housing; a floor treating device connected adjacent to the lower surface of the multi-part housing; a debris collection device connected adjacent to the lower surface of the multi-part housing; and wherein the rear housing portion is capable of selective rotation about an axis parallel to the axis extending between the center of the first wheel and the center of the second wheel.
The Summary of the Invention is neither intended nor should it be construed as representing the full extent and scope of the present invention. Moreover, references made to “the present invention” or aspects thereof should be understood to mean certain embodiments of the present invention and should not be construed as limiting all embodiments to a particular description. The present invention is set forth in various levels of detail in the Summary of the Invention, and in the attached drawings and the Detailed Description of the Invention and no limitation as to the scope of the present invention is intended by either the inclusion or non-inclusion of elements, components, etc. in this Summary of the Invention. Additional aspects of the present invention will become more readily apparent from the Detail Description, particularly when taken with the drawings.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description of the invention given above and the detailed description of the drawings given below, serve to explain the principles of these inventions.
To assist in the understanding of one embodiment of the present invention the following list of components and associated numbering found in the drawings is provided herein:
It should be understood that the drawings are not necessarily to scale. In certain instances, details that are not necessary for an understanding of the invention or that render other details difficult to perceive may have been omitted. It should be understood, of course, that the invention is not necessarily limited to the particular embodiments illustrated herein.
Referring now to
The cleaning assembly 22 also includes a hopper 66 partially comprising a rear wall 70 and a bottom wall 74. Airflow is directed by the brushes around the curved wall 62 into the hopper assembly 66. The hopper assembly 66 includes a screen 78 that allows smaller particles and debris to pass to a center opening 86, but prevents passing larger debris from reaching the opening 86. In one embodiment of the present invention, the screen 78 comprises a plurality of fins 82 angled such that the airflow and carried debris is directed to a center opening 86 of the screen assembly 78 and which is in fluid communication with the vacuum hose 90. To increase vacuum, and in some embodiments to help to provide the air path 50 shown, a flap 94 may be provided around at least three sides of the cleaning assembly 22.
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In one embodiment, the shaft 278 is hexagonal and cooperates with a hexagonal opening in the slip fitting 270 to allow rotation of the steering wheel 226 to be translated to the steerable shaft 222 to allow the rotation of the steerable front wheel 214. One skilled in the art will appreciate, however, that any configuration that provides rotational locking between the slip fitting 270 and the shaft 278 that would allow for rotation of the shaft 278 upon rotation of the slip fitting 270 is within the scope of the disclosure.
The flexible portion 274 may be constructed of nylon impregnated rubber or any other compliant or flexible material. Alternatively, a wire overwrapped flexible bellows member may be used instead of a composite rubber member. Further, to facilitate rotational translation of the steering wheel 226 to the steering mechanism 218, the flexible portion 274 may comprise a rubber tube wrapped by a flexible metal coil. Additionally, one of skill in the art will appreciate that a bellows system may be used wherein the slip fitting 270 is omitted and the bellows would be directly interconnected to the steering mechanism 218 and would allow for bending of the steering shaft 222 and selective elongation thereof only if needed. One skilled in the art will appreciate the systems that may achieve the goal of providing at least one of flexibility in the steering assembly and/or elongation to accommodate the moving of the front housing.
In one embodiment of the present invention the flexible portion 274 is made of steel reinforced rubber and is about 22 inches long. In some embodiments, the steering shaft 278 is 9 inches long and has a hexagonal exterior configuration that fits into a hexagonal opening of the slip fitting 270. One skilled in the art will also appreciate that the shaft 278 may be hollow such that the slip fitting 270 fits within the shaft 278, for example.
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The housing 308 also includes a plurality of wheels 318 operably interconnected to the bottom surface 310 to enable steering and provide stability. It is contemplated that the operator 306 will stand on the platform 304 and steer the apparatus 302 with either a steering wheel 320 or other type of steering mechanism, such as a joy stick 322. Such an embodiment of the present invention enables the floor surface to be cleaned or otherwise treated more efficiently, since the operator 6 does not have to push or pull an often heavy apparatus. In addition, because the human component of powering or otherwise moving the apparatus 302 is omitted, more consistent flooring treatment is achieved, saving materials and reducing costs of the entire cleaning operation.
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The housing 308 is constructed of any material, but preferably hard plastic will be used to reduce the weight of the apparatus 302. A plurality of wheels 318 are operably interconnected to the rear of the apparatus 302 to provide stability and perhaps power for locomotion. In addition, a squeegee 316 is often included and it is adapted to extract or funnel water or debris to a location where it is extracted via vacuum into a container generally, but not always, located at least partially inside the housing 308 (which as explained can be connected to a rear housing). Further, this embodiment of the present invention (
In the illustrated embodiment, the operator 306 can control the apparatus 302 with a plurality of joy sticks 322. Hand grips 324 are provided on the sides of the operator 306 to increase safety. Further, this embodiment of the present invention employs powered wheels 326 that allow the entire system to rotate on a single vertical axis without substantially transitioning in other directions. More specifically, this embodiment of the present invention can perform a 360° turn, which aids cleaning of tight spaces. Other disclosed embodiments of the invention also can rotate 360° without moving substantially in other directions.
An alternate embodiment of the present invention that is used for burnishing is shown in
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The squeegee 316 of one embodiment of the present invention is provided with a plurality of wheels 318 that interface with the floor to maintain the vertical clearance of the squeegee assembly. Side rollers may be provided that prevent the squeegee 306 from contacting a vertical surface, such as a wall. These wheels and various portions of the squeegee assembly may be selectively adjustable such that the width of the squeegee 316 and the placement of the wheels 318 (squeegee height) may be altered at will.
The swing arm 336 connects to a pivot 342 that utilizes the momentum of the squeegee 316 to swing it from the apparatus 302. However, one skilled in the art will appreciate other methods of transitioning the squeegee 316 from the floor treatment apparatus 302 may be utilized without departing from the scope of the invention. More specifically, a motorized system may be employed that is in communication with the steering system of the vehicle such that rotation of the steering wheel will swing the squeegee 316 away from the apparatus 302 in a predetermined manner.
An actuation system that selectively raises the squeegee 316 from the floor may also be included as shown in
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Embodiments of the present invention also include hand grips 324 adjacent to the control panel 376 to provide support for the operator. More specifically, during tight turns the inertial forces acting upon an individual may cause an operator to fall. Hand grips 324, which may be integrated onto the chassis of the apparatus, will give the operator a place to hold onto the device for added comfort and provide an additional safety feature. In addition they provide support when operating control switches located adjacent to handle grip.
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The operator presence switch 380 of one embodiment of the present invention is designed to act as a safety feature that interrupts the throttle pedal when not depressed. This ensures that the operator has both feet positioned on the platform when the machine is in use. Upon deactivation of the switch, for example if the operator removes a foot from the switch, a neutral mode may be engaged such that no power or forward or rearward motion of the device is possible. In addition, the operator presence switch 380 may ensure sufficient weight is maintained on the platform as a safety feature.
In the typical use, the platform switch is in operable connection with the platform, such that it is activated when the operator stands on the platform. The operator must then engage a reset device, preferably on the control panel, to initiate motion. The purpose of the platform switch and reset switch acts as a safety feature such that the machine does not immediately move when the operator steps on to the peddle platform. Upon deactivation of the switch, for example if the operator steps from the apparatus, a neutral mode may be engaged such that no power and forward or rearward motion is possible.
The throttle 382 of some embodiments of the present invention is adapted to selectively increase or decrease the speed of the apparatus depending on the desires of the operator. More specifically, various speed ranges may be included: neutral, first, second, third, reverse, etc. (or slow, medium, fast, etc.). In some embodiments, cleaning operations are performed at slow speeds, while transportation from location to location is performed at higher speeds. When the operator sets the speed range to first, for example, the activation of the throttle 382 will propel the apparatus within that speed range, such that it cannot transition from the first range to the second range without a manual shift of the range. Embodiments of the present invention include a hand speed range selector, wherein the throttle 382 turns the desired speed range to an activated mode. The neutral mode may also be set by the operator, wherein no amount of throttle 382 engagement will increase the speed of the apparatus. In addition, as mentioned briefly above, when the operator removes his or her foot from the operator presence switch 380, the apparatus automatically disengages the throttle. One skilled in the art will appreciate however, that a throttle 382 may be provided that provides selective speed increments, such as employed on an automobile, without departing from the scope of the invention.
Embodiments of the present invention also include a braking mechanism. For example, when an operator removes his or her foot from the operator presence switch 380, throttle, or disengages the platform switch, a braking mechanism may be employed such that any motion of the apparatus automatically or gradually ceases. The braking mechanism may be electro mechanical, mechanical or hydraulic. Alternatively, the foot brake may be provided adjacent to the throttle 382 or operator presence switch 380 that provides the same halting capability. Further, hand or emergency brakes may be employed adjacent to the control panel of the apparatus.
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Although not shown, a filter may be in fluid communication with the fluid pump. This filter is designed to capture any debris that may adversely affect the operation of the pump. On many cleaning machines, the filter is placed in a hard to access location, such that repair or monitoring is very difficult. Thus, one embodiment of the present invention includes a filter situated on the outer surface of the housing, perhaps on the control panel. Thus, the operator has ample opportunity to monitor the integrity of the filter and make quick repairs when necessary.
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In addition, the main storage tank 351 may be made out of a formable material such that exhaust channels 394 may be machined or molded into the main storage tank 351. The channels 394 direct the exhaust air from the vacuum 392 to an exit muffler of the apparatus. The channels 394 also act as a baffle to remove noise energy from the exhaust gases, thus making the entire system quieter.
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Further, some embodiments of the present invention are provided with tip over stops adjacent to the front corners of the apparatus. The stops may be replaceable and ensure that the apparatus does not tip over during tight turns. The tip over stops are generally constructed out of a material harmless to flooring, such as Teflon, silicone, rubber, plastic, etc. In addition, one skilled in the art will appreciate that rollers may be employed that are situated a predetermined distance from the floor to perform the same function.
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While various embodiments of the present invention have been described in detail, it is apparent that modifications and alterations of those embodiments will occur to those skilled in the art. However, it is to be expressly understood that such modifications and alterations are within the scope and spirit of the present invention, as set forth in the following claims. Further, the invention(s) described herein is capable of other embodiments and of being practiced or of being carried out in various ways. In addition, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.
This application is a continuation of U.S. patent application Ser. No. 14/133,248, filed Dec. 18, 2013, which is a continuation of U.S. patent application Ser. No. 12/912,554, filed Oct. 26, 2010, which is a continuation-in-part of U.S. patent application Ser. No. 11/868,353, filed Oct. 5, 2007, now U.S. Pat. No. 8,245,345, which is a continuation of U.S. patent application Ser. No. 11/059,663, filed Feb. 15, 2005, now U.S. Pat. No. 7,533,435, which is a continuation-in-part of abandoned U.S. patent application Ser. No. 10/737,027, filed Dec. 15, 2003, which is a continuation-in-part of abandoned U.S. patent application Ser. No. 10/438,485, filed May 14, 2003, and which claims the benefit of U.S. Provisional Patent Application Nos. 60/545,153 and 60/627,606, filed Feb. 11, 2004 and Nov. 12, 2004, respectively, the entire disclosures of which are incorporated by reference herein. U.S. patent application Ser. No. 12/912,554 also being a continuation-in-part of abandoned U.S. patent application Ser. No. 11/253,100, filed Oct. 17, 2005, the entire disclosure of which is incorporated by reference herein. U.S. patent application Ser. No. 12/912,554 also being a continuation-in-part of abandoned U.S. patent application Ser. No. 11/352,191, filed Feb. 9, 2006, the entire disclosure of which is incorporated by reference herein. U.S. patent application Ser. No. 12/912,554 also being a continuation-in-part of abandoned U.S. patent application Ser. No. 11/351,653, filed Feb. 9, 2006, the entire disclosure of which is incorporated by reference herein. U.S. patent application Ser. No. 12/912,554 also being a continuation-in-part of U.S. patent application Ser. No. 12/511,704, filed Jul. 29, 2009, now U.S. Pat. No. 8,302,240, the entire disclosure of which is incorporated by reference herein. U.S. patent application Ser. No. 14/133,248 is also a continuation-in-part of U.S. patent application Ser. No. 13/964,046, filed Aug. 10, 2013, which is a continuation of U.S. patent application Ser. No. 13/888,140, filed May 6, 2013, now U.S. Pat. No. 8,528,142, the entire disclosure of which is incorporated by reference herein. This application is related to U.S. Pat. No. 5,555,596, entitled “Floor cleaning apparatus”; U.S. Pat. No. 5,485,653, entitled “Floor cleaning apparatus”; U.S. Pat. No. 5,628,086, entitled “Floor cleaning apparatus with Squeegee Mounting System”; and U.S. Pat. No. 5,608,947, entitled “Floor cleaning apparatus with Pre-Filter”; the entire disclosures of which are incorporated by reference herein.
| Number | Date | Country | |
|---|---|---|---|
| 60545153 | Feb 2004 | US | |
| 60627606 | Nov 2004 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 14133248 | Dec 2013 | US |
| Child | 14504263 | US | |
| Parent | 12912554 | Oct 2010 | US |
| Child | 14133248 | US | |
| Parent | 11059663 | Feb 2005 | US |
| Child | 11868353 | US | |
| Parent | 13888140 | May 2013 | US |
| Child | 13964046 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11868353 | Oct 2007 | US |
| Child | 12912554 | US | |
| Parent | 10737027 | Dec 2003 | US |
| Child | 11059663 | US | |
| Parent | 10438485 | May 2003 | US |
| Child | 10737027 | US | |
| Parent | 11253100 | Oct 2005 | US |
| Child | 12912554 | US | |
| Parent | 11352191 | Feb 2006 | US |
| Child | 11253100 | US | |
| Parent | 11351653 | Feb 2006 | US |
| Child | 11352191 | US | |
| Parent | 12511704 | Jul 2009 | US |
| Child | 11351653 | US | |
| Parent | 13964046 | Aug 2013 | US |
| Child | 14133248 | US |
