Patent Grant
9422679
(Not Applicable)
(Not Applicable)
(Not Applicable)
This invention relates generally to painting equipment for spray painting lines and traffic control indicia on pavement and more particularly relates to a glass bead dispensing apparatus for applying reflective glass beads onto a freshly painted line. The invention provides cost savings, improved convenience and enhanced operation of a walk behind, wheeled line striper, which is a machine in common use throughout the world. The invention also provides a glass bead dispensing apparatus that is easily demountable from the line striper for alternative use as a hand held bead dispenser.
Most painting contractors, who paint lines and traffic control indicia on pavement, use one of a few walk behind, wheeled line stripers purchased from two major manufacturers of these machines. An example is illustrated in
Although the sprayer can be fixed to the line striper, the sprayer of most line stripers is a demountable paint spray gun that is supported in a spray gun cradle. The line striper has a movable sprayer operator that moves the spray gun trigger to initiate spraying when the painter, who is walking or riding behind the line striper, actuates the hand trigger at the rear of the line striper. The cradle also allows the paint spray gun to be detached from the cradle so that the painter can use the spray gun to manually paint indicia other than stripes on the pavement. For example, a painting contract may include not only the painting of lines but may additionally include painting lane turning arrows, words or handicap parking symbols using stencils. The detachability of the paint spray gun allows the use of a single spray gun, which is conveniently available and easily accessible to the painter, for both manually painting such indicia and then returning the paint spray gun to the line striper to resume painting lines.
Many painting contracts require the application of glass beads to the paint in order to make the painted lines and traffic indicia reflect light from vehicles or other light sources. The beads must be applied while the paint surface is tacky or wet so they will adhere to the paint. In an attempt to provide this function for line painting, glass bead dispensers have been mounted to prior art line stripers aft of the paint sprayer. An example is shown in U.S. Pat. No. 6,478,507. [Because line stripers are vehicles that move across pavement when performing their painting operation, the terms front, back, rear, fore, forward and aft are used to describe relative positions and orientations and have meanings that are equivalent to the manner those words are applied to automobiles and boats]
In order to support both the paint sprayer and the glass bead dispenser on the line striper, line stripers have a horizontal support bar to which the paint spray gun cradle and the glass bead dispenser are mounted. This horizontal support bar extends in a fore/aft orientation, parallel to the line of travel of the striper. The sprayer is mounted forward of the bead dispenser so that glass beads from the dispenser can fall onto a freshly painted stripe as the line striper moves along the pavement. Ordinarily, the horizontal support bar can be raised and lowered in order to raise and lower the sprayer. Because the paint is sprayed from the sprayer nozzle in a diverging fan pattern, the width of the painted line can be increased and decreased by respectively raising and lowering the support bar and with it the sprayer.
Although the prior art line sprayers perform their intended function well, they also have some important deficiencies and problems which the present invention solves. Generally, the present invention provides enhanced cost benefits added convenience and avoidance of some operational and maintenance problems.
One deficiency of the prior art line stripers is that the glass bead dispenser is permanently mounted to the line striper. The result is that a painting contractor must either buy a second, hand-held bead dispenser or dispense glass beads onto freshly painted indicia from his or her hand or a hand held container. However, dispensing glass beads from the hand results in a bead distribution that is irregular and leaves areas of insufficient concentration and therefore less reflectivity. Casting glass beads onto the paint from the height of a human hand above the pavement permits a wind to carry many of the beads onto unpainted surfaces of the pavement. Those beads are wasted and cannot practically be retrieved.
Therefore, there is a need for a glass bead dispensing apparatus that can be quickly and easily demounted from the line striper, converted to a manual bead dispenser, used to apply glass beads to traffic indicia that were hand painted with a stencil and then quickly and easily returned to the line striper. The ease and timing for making these conversions are important because the painter wants to spend as little time as possible detaching, assembling or reattaching tools because doing so extends the time required for completing performance of the paint contract.
Another shortcoming of prior art line stripers is that their glass bead dispensers are not vertically adjustable independently of their sprayer. Although line stripers permit the horizontal support bar to be vertically adjusted to raise and lower the sprayer in order to widen or narrow the sprayed line, their bead dispenser, which is mounted to that horizontal support bar, is raised and lowered with the support bar. Consequently, when the horizontal support bar is raised, the bead dispenser is also raised to a greater height above the pavement. That greater height allows a wind to blow the dispensed beads farther from the painted line where they fall on unpainted surfaces of the pavement. This also leaves areas of insufficient bead concentration and less reflectivity Therefore, there is a need for a bead dispenser that can be raised and lowered independently of the horizontal support bar so that, when the support bar is raised, the bead dispenser can be lowered down to a more desirable lower height above the pavement where the dispensed beads are less susceptible to deflection by the wind.
Yet another problem with the prior art presents a dilemma to a designer who applies the prior art to the design of a line striper. Bead dispensers have a bead container with a horizontal exit slot near their bottom and a gate that pivots between a position blocking the exit slot and a position away from the exit slot to permit glass beads to pour out through the exit slot onto a freshly painted line. Some prior art line stripers have their bead dispenser oriented on the line striper with their gate on their upstream side of the dispenser facing forward toward the paint sprayer. Other line stripers have their bead dispenser oriented on the line striper with the gate on their downstream stream side facing aft away from the paint sprayer. However, each orientation presents a different problem but the invention solves both.
If a line striper of the prior art has its bead dispenser gate on the forward side of the bead dispenser so that it faces upstream toward the paint sprayer, suspended paint droplets that have not contacted the pavement are blown by a wind onto the bead dispenser. This overspray accumulates on the bead container of the dispenser and its gate, which is open during spraying. Particularly troublesome is the accumulation of paint on interfacing surfaces between the gate and the dispenser container in the area around the exit slot. Paint accumulated on these surfaces interferes with the dispenser's operation, for example by causing the gate to stick closed or causing any gasket material on the gate to stick to the bead container when the gate is closed and be torn away when it is opened.
Other line stripers of the prior art have their bead dispensers oriented in the opposite direction so their bead dispenser gate is on the aft side of the bead dispenser facing downstream away from the paint sprayer. In this aft-facing orientation, the bead container acts as a shield which avoids the above-described overspray problem but adds a new problem. If the pavement has an uneven surface such as hills, ledges or a protruding stone, the bottom of the gate can scrape or drag along the pavement. This frictional engagement with the pavement pulls the gate open. That is not a significant problem while spraying a line because whenever the painter, who is walking behind the striper, has actuated the trigger handle on the line striper, the bead dispenser is already opened. So paint is applied to the pavement and beads are applied onto the undried paint with little or no undesirable consequence.
However, scraping the gate along the pavement becomes a problem with a prior art line sprayer if the scraping happens when the line sprayer is being moved from the end of a line into position for painting the next line. It is obviously undesirable for paint to be sprayed onto an unintended area of the pavement while moving the line sprayer from one line to the next line. The painter must stop painting and clean that paint off the pavement. However, with prior art line sprayers, if the gate drags along the pavement and is pulled open while the line sprayer is moving between locations of desired paint applications, the movement of the gate to its open position also triggers the sprayer and causes paint to be sprayed. The result is that paint is sprayed onto the pavement at an unwanted location and continues to be sprayed until the gate rises above the pavement and closes. The reason for this unwanted spray is that the prior art has a fixed length, solid rigid rod that links the sprayer trigger to the bead dispenser gate for opening the gate when the sprayer is actuated. The problem with the prior art is that the trigger of the sprayer and the gate of the bead dispenser move in unison regardless of which is forced to its open position.
Therefore, there is a need for a bead dispenser apparatus that allows the bead dispenser gate to face downstream so it is shielded by the bead container but will not cause the paint sprayer to be accidentally actuated if the bead gate is inadvertently scraped open by a high spot on the pavement.
Another inadequacy of prior art line stripers is that the fore and aft distance of their bead dispenser from the sprayer cannot be adjusted or varied because their bead dispenser is fixed to the horizontal support bar. A painter may want to change the distance of the bead dispenser from the sprayer in order to apply the beads sooner after a paint with highly volatile solvent is applied to a hot pavement in order to control the paint drying time until the beads are applied to the paint. Also, the painter may want to move the bead dispenser farther from the sprayer on a windy day to minimize the overspray that blows onto the bead dispenser. Unfortunately, even if an owner of a line striper wished to vary that distance, the distance cannot be varied because of the rigid actuating link connected to the bead dispenser. Any fore and aft relocation of the prior art bead dispenser would result in the gate of the bead dispenser failing to open or would result in it being permanently held open at all times. Therefore, there is a need for a bead dispensing apparatus that permits the bead dispenser to be adjustably moved closer or farther from the sprayer.
Additionally, since the bead dispensing apparatus of the present invention is an after-market product that is installed on the line striper by the painter, there is a need for a bead dispenser that does not require that it be mounted at a critically precise location on the line striper's horizontal support bar but rather can be attached anywhere within a wide range of fore and aft locations.
The glass bead dispensing apparatus has a glass bead container with a laterally oriented exit slot, a gate opening and closing the exit slot and an upstanding support post. An aft mounting block is attachable to the horizontal support bar of the line striper and the support post of the bead dispenser is vertically, adjustable and fixable to the aft mounting block in a selected vertical adjustment. A bead gate actuation cable has its aft end attached to the bead dispenser for opening the gate in response to a tension force applied to an opposite forward end of the gate actuation cable. The forward end of the gate actuation cable is removably attachable to a forward mounting block that is also attachable to the horizontal support bar. The forward end of the gate actuation cable is drivingly linked to a sprayer operator so that the sprayer operator applies a tension force upon the gate actuation cable for opening the bead gate when the sprayer operator actuates the sprayer. For use as a hand held bead dispenser, the gate actuation cable and the bead dispenser are easily and quickly removed from the line striper. After removal, a handle bar is attachable to the upstanding support post of the bead dispenser and has a hand-actuable lever that connects to the forward end of the gate actuation cable for manually opening the bead gate.
In describing the preferred embodiment of the invention which is illustrated in the drawings, specific terminology will be resorted to for the sake of clarity. However, it is not intended that the invention be limited to the specific term so selected and it is to be understood that each specific term includes all technical equivalents which operate in a similar manner to accomplish a similar purpose.
U.S. Provisional Application No. 61/915,833 filed 13 Dec. 2013 is herein incorporated by reference.
Line Striper and it's Paint Sprayer
Referring to
The paint spray gun 12 is actuated by a conventional spray gun trigger 24 to initiate spraying when moved in one direction (upward in
The sprayer actuation cable 32 has the forward end of its outer conduit seating in a conduit fitting 34 that in turn is attached to a conduit fitting support 35 fixed to the horizontal support bar 22. The core of the actuation cable 32 is attached to a core fitting 38 that is fixed to the top of the upwardly extending lever arm 31 of the paint sprayer operator 26. The opposite end of the actuation cable 32 is connected to a hand trigger 40 (
Forward and Aft Mounting Blocks
The aft mounting block 44 is attached to the horizontal support bar 22 aft of the forward mounting block 42. Its purpose is to removably support a glass bead dispenser at a desired location as will be subsequently described. One convenient feature of the invention is that once the mounting blocks 42 and 44 are attached to the horizontal support bar 22, neither of them needs to be removed when the glass bead dispenser is temporarily removed for hand application of glass beads.
Glass Bead Dispenser
The glass bead dispenser 50 and the manner of attaching it to the aft mounting block 44 are illustrated in
For controlling the outflow of glass beads, the bead dispenser 50 has a bead dispenser gate 56 that is movable between a position blocking the exit slot and a position opening the exit slot. The gate 56 has a gate operator 58 which is a lever mounted at a central pivot axis 60 to the bead container 52 for moving the gate 56 between its opened and closed positions. The lower lever arm 57 of the gate operator 58 is attached to the gate 56 below the pivot axis 60. The upper lever arm 59 of the gate operator 58 extends upward above the pivot axis 60 for connection to the aft end of a gate actuation cable 72 that opens the gate 56 and is described below. The gate 56 also has a pliant material forming a gasket 62 for making a tighter seal against the bead exit slot. A spring 64 biases the gate operator 58 in a direction of rotation that closes the gate 56 against the bead exit slot. For mounting the aft end of the gate actuation cable 72, an actuation cable conduit mounting arm 65 is attached to the bead container 52 and is spaced from the gate operator 58. As will be seen, the core of the gate actuation cable 72 is attached to the gate operator 58 so that a tension force applied to the opposite end of the core pulls the gate operator 58 in a direction of rotation that opens the gate 56.
An upstanding bead container support post 66 is fixed to the top of the bead container 52 for attachment to the aft mounting block 44. For this purpose, the aft mounting block 44 additionally has a second hole oriented with its axis in a vertical orientation, in the operable attached orientation of the aft mounting block, for receiving the upstanding support post 66 of the bead dispenser 50. The vertical hole or opening is a guide surface for maintaining the bead dispenser support post 66 in a vertical orientation while allowing the support post 66, along with the entire bead dispenser 52, to be vertically adjusted and then fixed at a selected height above the pavement without any need to move the horizontal support bar 22. This also permits the entire bead dispenser 52 to be easily removed for use as a hand held bead dispenser.
Horizontal adjustment of the distance from the sprayer 12 to the bead dispenser 50 is possible by mounting the bead dispenser 50 to a slidable, aft mounting block 44. Vertical adjustment of the bead dispenser 50 to a selected height above the pavement, rapid removal of the bead dispenser 50 from the line striper for use as a hand held bead dispenser, rapid attachment of the bead dispenser 50 to a handle and rapid replacement of the bead dispenser 50 on the line striper are all made possible by the manner of fixing the position of the bead dispenser support post 66 in the aft mounting block 44. A series of diametrically oriented holes 68 are vertically spaced at 1 inch intervals along the bead dispenser support post 66. A horizontal hole through the aft mounting block 44 can be aligned with any of the holes 68 through the support post 66 by vertically sliding the support post 66 along the vertical hole through the aft mounting block 44. When the horizontal holes are brought into registration, a linchpin 70 is inserted through the holes to retain the support post 66 in the selected position in the aft mounting block 44. For vertical adjustment of the height of the bead dispenser 50 above the pavement after the horizontal support bar 22 has been raised or lowered, the linchpin 70 is removed, the support post 66 is vertically slid through the vertical hole in the aft mounting block 44 and the linchpin 70 is reinserted with the bead dispenser 50 at a selected height. For removal of the bead dispenser 50 from the aft mounting block 44, the linchpin 70 is withdrawn from its aligned horizontal holes and then the bead dispenser support post 66 along with the entire bead dispenser 50 is lowered out of the aft mounting block 44. As will subsequently be described, the bead dispenser 50 is also quickly mounted to a tubular handle by aligning similar holes in the handle with one of the holes 68 through the bead dispenser support post 66 and inserting the linchpin 70.
Actuation Connection from Sprayer to Bead Dispenser
Of critical importance for obtaining several of the improvements of the invention is that an actuation cable, rather than a rigid link, is a part of the mechanical drive connection from the paint sprayer operator 26 to the bead dispenser gate operator 58 for opening the gate 56 when the sprayer operator 26 actuates the sprayer 12 to begin spraying. Actuation cables are themselves well known in the prior art. They consist of a core, usually in the form of a stranded wire and a surrounding conduit through which the core slides. Conduit end fittings receive the opposite ends of the conduit and are attached to respective conduit mounting arms to fix the ends of the conduit in stationery positions. Conduit mounting arms have a hole through which the conduit end fitting is inserted. The conduit end fittings are sometimes provided with a radial slot that runs lengthwise for insertion of the core into the conduit end fitting. A core connector (sometimes called a head, such as a barrel head) is secured to each of the opposite ends of the core. When the core connector at one end is moved to apply a tension force on the core, the core slides through the conduit and the core connector at the opposite end is moved.
The glass bead dispenser gate 56 is connected to the paint sprayer operator 26 in a manner that accomplishes three goals: (1) opening the bead gate 56 when the sprayer operator 26 initiates spraying; (2) closing the gate when the sprayer operator 26 stops the spraying; and (3) not actuating the sprayer operator 26 if the gate 56 is unintentionally forced open, such as by being pulled open as a result of being scraped or dragged along the pavement. The principal components of the drive connection between the paint sprayer operator 26 and the bead dispenser gate 56 are (1) the gate actuation cable 72 that is connected at its aft end 74 to the bead dispenser 50 and (2) a mechanical drive link connected between the forward end of the gate actuation cable 72 and the sprayer operator 26. The mechanical drive link is supported on the forward mounting block 42 and is arranged to cause the sprayer operator 26 to apply a tension force upon the core 76 for opening the bead gate 56 when the sprayer operator 26 actuates the sprayer 12 and for releasing the tension force when the sprayer operator 26 pivots to stop the spraying.
Looking at these components in more detail, the aft end of the gate actuation cable 72 has a conduit fitting 82 that is attached to the actuation cable mounting arm 65 of the bead dispenser 50. The core 76 of the gate actuation cable 72 extends through the bead gate bias spring 64 into attachment to the upper lever arm 59 of the bead gate operator 58. Consequently, if a tension force is applied to the opposite forward end of the core 76 of the gate actuation cable 72 and the tension force pulls the core 76 forward, that forward movement pulls the upper lever arm 59 of the gate operator 58 forward and opens the bead gate 56. However, an important observation to remember is that, if the bead gate 56 is dragged along the pavement and pulled open, no force is transmitted through the gate actuation cable 72. Instead, the resulting forward movement of the upper lever arm 59 of the gate operator 58 merely pushes (applies a compression force) on the core 76. The pushed core cannot overcome the friction in the actuation cable 72 and the friction and forces applied to the mechanical linkages at the forward end of the bead gate actuation cable 72. So instead, the pushed core 76 simply bends or droops into a smooth curve within the gate bias spring 64 with no translation of the core 76 inside its conduit. So no force is transmitted forward that would actuate the paint sprayer and cause an unintended application of paint to the pavement.
Referring principally to
The mechanical drive link connecting the forward end of the gate actuation cable 72 to the sprayer operator 26 comprises (1) a direction-reversing bell crank 84 and (2) a sprayer operator connecting link 86 connecting the bell crank 84 to the sprayer operator 26. The direction-reversing bell crank 84 is pivotally mounted by a pivot axle 88 that is fixed to the forward mounting block 42. The preferred bell crank 84 includes a lever arm 90 that, in operable connection on the pavement line striper, extends upward from the pivot axle 88. A second lever arm 92 of the bell crank 84 extends downward from the pivot axle 88. Most preferably, the direction-reversing bell crank 84 is a 180° bell crank that is a simple lever having its lever arms extending in 180° opposite directions
In order to removably attach the forward end of the actuation cable core 76 to the upper lever arm 90, a slot 94 bifurcates the upper end of the direction reversing bell crank 84 into two branches. A cross bore 96 extends through the two branches and across the slot 94 for receipt of a forward core fitting, preferably a barrel head connector 98, that is swedged or swaged onto the core 76 of the bead gate actuation cable 72. A radial slot 97 in at least one of the bifurcated branches permits passage of the core 76 into or out of the slot 94 for manual insertion or removal of the barrel head connector 98 into or out of the cross bore 96.
This arrangement allows for the very rapid and easy removal of the forward end of the bead gate actuation cable 72 from the forward mounting block. The previously described manipulations lift the core 76 out of the conduit end fitting 80 and then the forward core fitting 98 is slid laterally from the direction-reversing bell crank 84. The now free forward end of the bead gate actuation cable 72 is available for connection for manual bead application.
The sprayer operator connecting link 86 is connected so that a direction of rotation of the sprayer operator 26 that actuates the trigger 24 of the sprayer 12, also applies a tension on the dispenser gate actuation cable 72. The preferred sprayer operator connecting link 86 is pivotally connected to the lower lever arm 92 of the direction-reversing bell crank 84 and pivotally connected at the connecting link's opposite end to the paint sprayer operator 26. Preferably, the sprayer operator connecting link 86 is pivotally connected to the upwardly extending lever arm 31 of the sprayer operator 26 above the pivot axis 28 of the sprayer operator 26. The most preferred sprayer operator connecting link 86 is a shaft bent out in opposite directions at right angles at its ends. One bent out end is pivotally connected to a hole in the paint sprayer operator 26 and the opposite bent out end is pivotally connected to a hole near the lower end of the direction reversing bell crank 84.
Handle Bar for Manual Application of Glass Beads
The upper end 104 of the handle bar 100 is bent into a cane-like crook shape to permit a comfortable and secure grip by the painter. A hand-actuable lever 106, that is like a bicycle brake engagement lever, is attached to the upper end 104 in position for actuation by the painter. The hand-actuable lever 106 has an actuation cable mounting arm 108 to which is mounted an actuation cable conduit end fitting 110. The forward end of the actuation cable 72 (upper end when on the handle bar 100) is removably attachable to the actuation cable conduit end fitting 110 on the cable conduit mounting arm 108 of the handle bar 100 in the same manner as described above. Similarly, the forward core fitting 98 is removably attachable to the hand-actuable lever 106. Consequently, when the painter squeezes and pivots the hand-actuable lever 106, a tension force is applied to the actuation cable 72 to open the bead gate 56. Releasing the lever 106 allows the bead gate to be closed by its biasing spring 64.
It should be apparent that the length of the actuation cable should be at least long enough to allow adjustment of the fore and aft location of the bead dispenser along the horizontal support bar 22. The core of the actuation cable needs to be at least as long as the distance from the top end of the direction reversing bell crank 84 to the bead dispenser gate operator 58. However, the position of the bead dispenser 50 along the horizontal support bar is not critical. The proper opening and closing functions of the bead gate 56 are not affected by the position. As a result, no critical adjustment is required.
This detailed description in connection with the drawings is intended principally as a description of the presently preferred embodiments of the invention, and is not intended to represent the only form in which the present invention may be constructed or utilized. The description sets forth the designs, functions, means, and methods of implementing the invention in connection with the illustrated embodiments. It is to be understood, however, that the same or equivalent functions and features may be accomplished by different embodiments that are also intended to be encompassed within the spirit and scope of the invention and that various modifications may be adopted without departing from the invention or scope of the following claims.
This application claims the benefit of U.S. Provisional Application No. 61/915,833 filed 13 Dec. 2013.
| Number | Name | Date | Kind |
|---|---|---|---|
| 3687371 | Swager | Aug 1972 | A |
| 4624602 | Kieffer et al. | Nov 1986 | A |
| 4877348 | Opie | Oct 1989 | A |
| 5302207 | Jurcisin | Apr 1994 | A |
| 5368232 | Schroeder | Nov 1994 | A |
| 5947385 | Lanerd et al. | Sep 1999 | A |
| 6478507 | Schroeder et al. | Nov 2002 | B2 |
| 7237783 | Kieffer et al. | Jul 2007 | B2 |
| 7673815 | Schroeder et al. | Mar 2010 | B2 |
| 8061295 | Zimmerman | Nov 2011 | B2 |
| Entry |
|---|
| Graco Inc, Instructions-Parts List, Kit, Beads Dispenser, 1999, pp. 1-8, 308940J, Graco Inc., Minneapolis, MN. |
| Titan Wagner Striper (photo of). |
| Number | Date | Country | |
|---|---|---|---|
| 61915833 | Dec 2013 | US |
