Patent Grant
7287300
The present invention relates to a portable vacuum system and more specifically to a backpack mounted portable vacuum system.
Portable vacuum systems, namely, backpack mounted vacuum systems, are well known in the art. For example, U.S. Pat. No. 1,047,164 provides for a backpack mounted cotton picking machine having a vacuum mounted to the backpack and a battery located in a battery compartment on a waist belt. A wire connects the battery with the vacuum to supply power thereto.
U.S. Pat. No. 4,748,712 teaches a backpack mounted vacuum cleaner system with a rechargeable battery that can be removed and replaced. Alternatively, the system can have both a rechargeable battery and an electrical plug for connecting with an external power source. A blower motor is connected to the battery or plug to spin the fan in the blower and pull debris-laden air through a cloth separation means. The cloth separation means retains the collected debris for subsequent removal.
U.S. Pat. No. 5,267,371 teaches a backpack mounted vacuum cleaner system having a lower casing designed to be releasably mounted to an upper casing. The lower casing is a debris collector. An air entry port supplies dirt laden air tangentially to the interior surface of the lower casing. The air entry port may be located on either the right or left side of the system. A centrifugal force is applied to the dirt-laden air causing it to rotate within chamber. The larger and heavier dirt is deposited in the lower portion of the lower casing. The air moves upwardly where it passes through the motor and then through an exit port designed to direct air away from the operator. A HEPA type filter may be located in the exit port.
U.S. Pat. No. 6,066,211 teaches a handheld, battery-powered electric vacuum cleaner system having a battery pouch attached to a belt. The battery pouch is used for holding a rechargeable and replaceable battery. A power cord connects the battery to the motor portion of the vacuum cleaner.
U.S. Pat. No. 6,568,026 provides for a backpack mounted vacuum system. A canister is removably attached to the bottom portion of the backpack. The canister collects debris from the air stream and contains a filter. A vacuum motor is located in the upper portion of the backpack, thus drawing air through the hose, into the canister, through the filter and then out the top of the vacuum through outlets.
U.S. Pat. No. 6,553,610 provides for a modular backpack vacuum system. The device comprises a filter unit and a motor unit that are designed to be releasably attached to each other. The patent states that multiple filter units could be used for different purposes. For example, one filter unit could have a HEPA filter or another could have a wet/dry filter. Depending on the application, the filter unit could be selected and attached to the motor unit. The filter unit can be attached to the motor unit with pins, compression fittings, band fittings and/or screw type threads. Use of a standard electrical connection, or rechargeable batteries, as a power source is generally disclosed.
U.S. Pat. No. 6,647,586 discloses a portable vacuum system that can be configured to wear as a backpack. A power source, such as a set of rechargeable batteries, may be used to power the vacuum motor. The motor, power source and debris bag are contained within either a semi-rigid or rigid enclosure. A collapsible debris wand is connected to the backpack.
The prior art described above all suffers from the same disadvantage. Namely, the prior art designs fail to provide a sufficient debris laden fluid path into the debris-collecting portion of the system. The debris laden fluid paths provided the systems described above are likely to clog thus reducing the efficiency of the vacuum system.
The prior art systems also are not designed to reduce strain and fatigue to the operator. More specifically, the handle portions of the prior art vacuum systems do not facilitate control over, or operation of, the floor brush and the vacuum system.
In light of these disadvantages, a backpack mounted vacuum system which is designed to reduce the likelihood of clogs and increase operator efficiency is needed.
The present invention is directed toward a portable vacuum system having a filter portion and a motor portion. The filter portion houses at least one filter and has a first vertical axis. The motor portion houses a motor and has a second vertical axis. The motor portion is preferably connected to the filter portion such that the first vertical axis is horizontally offset from the second vertical axis.
At least two debris inlets are attached to the filter portion. Preferably, the debris inlets communicate debris in the debris fluid path tangentially into an interior portion of the filter portion.
A flexible vacuum hose is attached to either one of the two debris inlets. The vacuum hose is connected to a debris wand that is held by the operator to position the floor head over areas to be cleaned. More specifically, the debris wand has a handle with a trigger selectively biased to interrupt an electrical circuit between the motor and a power source.
The above, as well as other advantages of the present invention, will become readily apparent to those skilled in the art from the following detailed description when considered in the light of the accompanying drawings in which:
It is to be understood that the invention may assume various alternative orientations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions, directions or other physical characteristics relating to the embodiments disclosed are not to be considered as limiting, unless the claims expressly state otherwise.
In the preferred embodiment, at least two battery pack compartments 32 are releasably secured to the waist strap 28. One or more rechargeable or non-rechargeable batteries 34 are located within the compartments 32. At least one wire 36 electrically connects the batteries 34 within the compartments 32 to the vacuum system 24 to provide electrical power to the vacuum system 24 as described in more detail below.
By way of example only, the batteries 34 may be nickel metal hydride batteries electrically connected in series. Preferably, a plurality of nickel metal hydride batteries are connected in series to provide sufficient voltage for a sufficient amount of time to run the vacuum system 24. Those skilled in the art will appreciate that other types of batteries may also be used.
Referring now to
In the preferred embodiment depicted in
At least two debris inlets 50 are integrally formed with the filter portion 40. Preferably, the at least two debris inlets 50 are located on an upper, rear portion 52 of the filter portion 40, although those skilled in the art will appreciate that they can be located anywhere on the filter portion 40. In
In the preferred embodiment, the debris inlets 50 are in fluid communication with a substantially cylindrical interior portion 54 of the filter portion 40. As seen in
As best seen in
The filter portion 40 and the motor portion 38 are designed to engage with one another so that the first vertical axis 42 is offset from the second vertical axis 44 by a predetermined distance 68, as schematically depicted in
The shield 82 is preferably located at least partially around the filter 80. The shield 82 reduces, or prevents, debris from becoming lodged within the pleats 84 of the filter 80 from the tangentially positioned debris inlets 50 during operation of the vacuum system 24. The shield 82 may be located around the entire perimeter of the filter 80, as depicted in
The filter 80 preferably has an upper surface 88 with an upstanding portion 90. The upstanding portion 90 may be continuous about the upper surface 88 or it may be divided into sections. The upstanding portion 90 is designed to freely fit within a complementary shaped recess 92 in the filter portion 40. Preferably, the upstanding portion 90 is freely engaged with the complementary shaped recess 92 so that the filter 80 can be easily and readily removed for cleaning, maintenance, repair or replacement. The above-described engagement of the filter 80 and the filter portion 40 also facilitates alignment of the canister 60 and filter 80 with the filter portion 40. Those skilled in the art will appreciate that that mechanical devices can be used in addition to, or separately from, the frictional engagement to selectively secure the filter 80 within the filter portion 40.
One or more gaskets (not shown) may be located between the upper surface 88 of the filter 80 and the filter portion 40 to prevent, or reduce, debris from escaping. In one embodiment, the gasket is secured to the filter portion 40.
An electric vacuum motor 94 is mounted within the motor portion 38, as depicted in
The filter 80 fits within the canister 60 and functions to prevent, or reduce, the collected debris from escaping from the canister 60. The filter 80 is selectively removable from the canister 60 so that it can be removed and the debris can be emptied from the canister 60.
At least one electrical receptacle 100 is located on an outside surface 102 of the motor portion 40. The electrical receptacle 100 is electrically connected to the motor 94 for supplying electric current. As shown in
In one embodiment of the present invention, at least one perforated plate 106 is located in an upper portion 108 of the motor portion 38. The plate 106 supports at least one open cell foam pack 110 that is used to reduce motor and wind noise from the vacuum system 24. Those skilled in the art will appreciate that other materials may also be used to reduce motor and wind noise and filter the fluid stream. By way of example only, the foam pack 110 may be removed and a HEPA filter may be located in its place.
Continuing to refer to
In the preferred embodiment, at least one gasket 124 is located between the cover 112 and the motor portion 38. The gasket 124 reduces, or prevents, air from escaping between the motor portion 38 and the cover 112.
The cover 112 preferably has at least one integrally formed exhaust vent 126 to direct exhausted air away from the operator. Additional exhaust vents may be used having other shapes and locations than that depicted without departing from the scope of the present invention.
A flexible, air tight vacuum hose 128, as known to those skilled in the art, includes a first end 130 for connecting with either of the two debris inlets 50 and a second end 132 for connecting with a handle 134. A preferred embodiment of the handle 134 is depicted in
The housing 136, as well as the filter portion 40, the motor portion 38 and the cover 112, is preferably rotomolded. As known to those skilled in the art, the rotomolding process typically starts with a cast or fabricated mold. The mold is placed in a rotomolding machine that has at least a loading area, a heating area and cooling area.
Pre-measured plastic resin, such as a high-density polyethylene, is loaded into the mold, then the mold is moved into a heating area where it is slowly rotated about its vertical axis and its horizontal axis. The melting resin sticks to the hot mold and coats every surface evenly. The mold continues to rotate in the cooling area so the formed part retains a uniform wall thickness, if that is desired.
When the part is adequately cooled, it is released from the mold. The rotational speed, heating and cooling times are all controlled throughout the process and may be adjusted based on the design of the product.
In the preferred embodiment, the housing 136 is rotomolded directly to the wand 142. Preferably, the wand 142 is constructed of a metal material, such as an aluminum alloy, although other materials, such as plastic, may be used without departing from the scope of the present invention. It is also preferred that the wand 142 have at least one portion selectively slidable within another portion to provide a telescoping function as known to those skilled in the art. A powered or non-powered floor head 144 is removably attached to the end of the wand 142 for sweeping over and/or agitating a floor surface.
In a preferred embodiment depicted in
It has been found that by selectively engaging the vacuum system 24 with the trigger 140, battery life is significantly prolonged. It has also been found that by positioning the operator's hand directly on the wand 142 in the area of the handle 134, increased control over the floor head 144 is achieved.
A method of operating the portable vacuum system 20 includes connecting the electrical receptacle 100 to a power source, such as a wall outlet. A standard extension cord can be used to connect the wall outlet with the electrical receptacle 100. Alternatively, the wire 36 connecting the batteries 34 within at least one of the battery compartments 32 to the motor 94 may be used to supply electricity to the motor 94.
In the preferred embodiment, an operator secures the harness system 22, with the vacuum system 24 attached, to his or her back. The operator attaches the first end 130 of the hose 128 to one of the debris inlet 50. Preferably, the operator attaches the first end 130 to the debris inlet 50 that is closest to the hand in which he or she will hold the wand 142. The debris inlet 50 that is not attached to the hose 128 is blocked with a selectively removable cover (not shown).
The operator positions the floor head 144 adjacent or over a spot to be cleaned and engages the trigger 140. Preferably, the operator is grasping the wand 142 so that his or her fingers are below the wand 142 and at least one finger is positioned on the trigger 140. The operator urges the trigger 140 toward the wand 142 thus completing the electrical circuit between the wall outlet or batteries 34 and the electric motor 94.
Energizing the electric motor 94 causes the vacuum fan 98 to spin creating a source of vacuum within the system 24. The source of vacuum draws debris from the floor through the floor head 144 and through the wand 142 and hose 128. The debris enters the debris inlet 50 of the filter portion 40 where at least the tangential orientation of the inlet 50 to the filter portion 40 and the cylindrical shape of the interior portion 54 creates a cyclonic debris path 78 circumferentially in the space between the interior portion 54 of the filter portion 40 and the filter 80, and/or the filter shield 82, as the case may be. In the preferred embodiment, debris in the debris path 78 contacts the filter shield 82 causing the debris to lose velocity. Heavier debris particles, or debris particles with a diminished velocity, fall to the bottom of the filter portion 40 in a downward spiral; other smaller debris particles in the debris path 78 are drawn into the filter 80 where they are removed.
The vacuum fan 98 draws air, cleaned of debris, upwardly through the fluid channel 86 of the filter 80, through the filter portion 40 and through the motor portion 38. The air passes through the foam pack 110 and it is exhausted through the exhaust vent 126. Alternatively, if the HEPA filter is used, the air passes through the HEPA filter and then it is exhausted through the exhaust vent 126.
Additionally circuitry and electrical components, such as one or more microprocessors, may be added to monitor the electrical power remaining in the batteries 34. By way of example only, an electrical component that emits an audible tone can be used to alert the operator of the near depletion of a battery 34. Additionally, an electrical component to automatically cut electrical power to the motor 94 may be added if the component senses that the battery 34 is being depleted beyond a pre-determined point. A pressure differential sensor, as known to those skilled in the art, may also be added to the system 20. The sensor is designed to alert the operator when the canister 60 is full and needs to be emptied. Lights, horns, or other audio and/or visual indicators may be used in association with the sensor.
The system 24 may also have one or more control boards to automatically switch the system 24 from AC to DC power, and vice versa. The control board(s) are designed to sense when AC power is applied and automatically electrically disconnect the batteries 34, if they are still connected.
In accordance with the provisions of the patent statutes, the present invention has been described in what is considered to represent its preferred embodiments. However, it should be noted that the invention can be practiced otherwise than as specifically illustrated and described without departing from its spirit or scope.
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| Number | Date | Country | |
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| 20060005346 A1 | Jan 2006 | US |
