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US 4,235,377 AGranted
Portable paint spraying device
AssigneeThe Wooster Brush Company
InventorsHoward C. Davis, Donald L. Cooper
Life of this patent
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AssigneeThe Wooster Brush Company
InventorsHoward C. Davis, Donald L. Cooper
Estimating the term…
A portable pump spraying device includes a container for the liquid to be sprayed, a housing positioned above the container having a spraying chamber, a pumping unit to elevate the liquid to the spraying chamber, and a rotating disc in the spraying chamber to attenuate and impel the liquid by centrifugal force through an egress port in the housing. Interceptor baffles within the spraying chamber finely trim the liquid spray as it leaves the egress port and direct the excess liquid back to a reservoir for recirculation. The pumping unit includes a rod that is reciprocated by an eccentric on the rotating shaft on which the disc is mounted. The rod acts as a piston which on its suction stroke withdraws liquid from the container and on its compression stroke discharges the withdrawn liquid and forces it through a nozzle onto the disc in the spraying chamber. In one form of the invention, the volume of liquid being pumped by the pumping unit may be varied for varying the amount of liquid being sprayed without varying the speed of the pump drive motor and thus the speed of the disc driven thereby.
A portable pump spraying device comprising a container for the liquid to be sprayed, a housing removably connected to said container, said housing containing a spraying chamber with an egress slot therein, pump means for delivering liquid to said spraying chamber from said container, a vertically oriented disc in said spraying chamber, drive means for rotating said disc, and means for directing the liquid delivered to said spraying chamber by said pump means onto said vertically oriented disc, the rotation of said disc being operative by centrifugal force to impel a portion of the liquid directed thereon through said egress slot as a spray, and interceptor means within said spraying chamber to define the spray pattern angle and assist in returning excess liquid to said container for recirculation by said pump means, said egress slot being substantially vertical, including trailing and leading edges, and said interceptor means including a baffle positioned adjacent said trailing edge of said egress slot, said baffle extending both above and below said trailing edge and across the peripheral edge of said disc to trim the lower edge of the spray pattern and intercept the attenuated liquid in the region of said trailing edge of said egress slot for return to said container, thereby to keep liquid from dripping onto the external surfaces of said housing and disc adjacent the trailing edge of said slot, said interceptor means including a second baffle between the first baffle and said slot for finely trimming the lower edge of the spray pattern previously cut by said first baffle.
A portable pump spraying device comprising a container for the liquid to be sprayed, a housing removably connected to said container, said housing containing a spraying chamber with an egress slot therein, pump means for delivering liquid to said spraying chamber from said container, a vertically oriented disc in said spraying chamber, drive means for rotating said disc, and means for directing the liquid delivered to said spraying chamber by said pump means onto said vertically oriented disc, the rotation of said disc being operative by centrifugal force to impel a portion of the liquid directed thereon through said egress slot as a spray, and interceptor means within said spraying chamber to define the spray pattern angle and assist in returning excess liquid to said container for recirculation by said pump means, said interceptor means including a baffle positioned adjacent said leading edge of said egress slot, said baffle having a generally transversely extending interceptor portion which projects from one side of said disc to the other adjacent the leading edge of said slot to intercept the liquid that is flung off said disc outwardly of said transversely extending interceptor portion for trimming the upper edge of the spray pattern, said baffle being generally fan shaped, including an angularly disposed upper leg portion behind said disc for collecting excess liquid in the upper portion of said spray chamber behind said disc and a vertically oriented leg portion extending around and downwardly below said drive means for directing the excess liquid back to the container.
A portable pump spraying device comprising a container for the liquid to be sprayed, a housing removably connected to said container, said housing containing a spraying chamber with an egress slot therein, pump means for delivering liquid to said spraying chamber from said container, a vertically oriented disc in said spraying chamber, drive means for rotating said disc, and means for directing the liquid delivered to said spraying chamber by said pump means onto said vertically oriented disc, the rotation of said disc being operative by centrifugal force to impel a portion of the liquid directed thereon through said egress slot as a spray, and interceptor means within said spraying chamber to define a generally vertically extending spray pattern angle and assist in returning excess liquid to said container for recirculation by said pump means, said interceptor means including a baffle positioned adjacent said leading edge of said egress slot, said baffle having a generally transversely extending interceptor portion which projects from one side of said disc to the other adjacent the leading edge of said slot to intercept the liquid that is flung off said disc outwardly of said transversely extending interceptor portion for trimming the upper edge of the spray pattern, and a downwardly extending portion adjacent one side of said disc extending around and downwardly below said drive means for collecting excess liquid in the upper portion of said spray chamber and directing the excess liquid back to the container.
A portable pump spraying device comprising a container for the liquid to be sprayed, a housing removably connected to said container, said housing containing a spraying chamber with an egress slot therein, pump means for delivering liquid to said spraying chamber from said container, a vertically oriented disc in said spraying chamber, drive means for rotating said disc, and means for directing the liquid delivered to said spraying chamber by said pump means onto said vertically oriented disc, the rotation of said disc being operative by centrifugal force to impel a portion of the liquid directed thereon through said egress slot as a spray, and interceptor means within said spraying chamber to define a generally vertically extending spray pattern angle and assist in returning excess liquid to said container for recirculation by said pump means, said interceptor means including baffle means positioned adjacent said leading edge of said egress slot on opposite sides of said disc, each said baffle means extending around and downwardly below said drive means for collecting excess liquid in the upper portion of said spray chamber and directing the excess liquid back to the container.
A portable pump spraying device comprising a container for the liquid to be sprayed, a housing removably connected to said container, said housing containing a spraying chamber with an egress slot therein, pump means for delivering liquid to said spraying chamber from said container, a vertically oriented disc in said spraying chamber, drive means for rotating said disc, and means for directing the liquid delivered to said spraying chamber by said pump means onto said vertically oriented disc, the rotation of said disc being operative by centrifugal force to impel a portion of the liquid directed thereon through said egress slot as a spray, said drive means including a motor positioned in a drive chamber in said housing, an output shaft extending from said motor into said spraying chamber, said disc being rotatably mounted on said output shaft, said pump means including means for converting the rotary motion of said output shaft and disc to reciprocal movement of a piston in said pump means, said piston being operative to withdraw liquid from said container during the suction stroke and deliver the withdrawn liquid through a delivery tube to said spraying chamber during the compression stroke, said delivery tube extending into said spraying chamber and terminating in axially spaced relation to said disc for directing the pumped liquid against one face of said disc, and means for varying the length of stroke of said piston to vary the amount of liquid being pumped by said pump means without varying the speed of said motor so that the rate of rotation of said disc remains substantially constant, said means for converting comprising an eccentric mounted on said output shaft in said drive chamber, and said means for varying the length of stroke of said piston comprising a connector member having a slot therein for receipt of said eccentric, said eccentric causing translating movement of said connector member during rotation of said eccentric, means mounting said connector member for pivotal movement about a pivot point radially spaced from said eccentric and the centerline of said piston, and means for moving said pivot point toward and away from the centerline of said piston, the bottom dead center and top dead center of said eccentric being slightly off center with respect to the centerline of said piston on opposite sides thereof, whereby the closer said pivot point is to said centerline the shorter the stroke of said piston and vice versa.
A portable pump spraying device comprising a container for the liquid to be sprayed, a housing removably connected to said container, said housing containing a spraying chamber with an egress slot therein, pump means for delivering liquid to said spraying chamber from said container, a vertically oriented disc in said spraying chamber, drive means for rotating said disc, and means for directing the liquid delivered to said spraying chamber by said pump means onto said vertically oriented disc, the rotation of said disc being operative by centrifugal force to impel a portion of the liquid directed thereon through said egress slot as a spray, and interceptor means within said spraying chamber to define a generally vertically extending spray pattern angle and assist in returning excess liquid to said container for recirculation by said pump means, said interceptor means including baffle means positioned adjacent said leading edge of said egress slot, said baffle means having an interceptor portion which projects from one side of said disc to the other adjacent the leading edge of said slot to intercept the liquid that is flung off said disc outwardly of said interceptor portion for trimming the upper edge of the spray pattern, and which also extends downwardly adjacent one side of said disc for collecting excess liquid in the upper portion of said spray chamber and directing the excess liquid back to the container.
A portable pump paint spraying device comprising a container for the paint to be sprayed, a housing removably connected to said container, said housing containing a spraying chamber with a vertically oriented egress slot therein, pump means for delivering paint to said spraying chamber from said container, a vertically oriented disc in said spraying chamber, drive means for rotating said disc, and means for directing the paint delivered to said spraying chamber by said pump means onto said vertically oriented disc, the rotation of said disc being operative by centrifugal force to impel a portion of the paint directed thereon through said egress slot as a spray, said drive means including an electric motor positioned in a drive chamber in said housing, and an output shaft extending from said motor into said spraying chamber, said disc being rotatably mounted on said output shaft, said pump means also being driven by said output shaft for delivering paint through a delivery tube to said spraying chamber, said delivery tube extending into said spraying chamber and terminating in axially spaced relation to said disc for directing the pumped paint against one face of said disc, and interceptor means within said spraying chamber to define a generally vertically extending spray pattern angle and assist in returning excess paint to said container for recirculation by said pump means, said interceptor means including baffle means positioned adjacent said leading edge of said egress slot, said baffle means having an interceptor portion which projects from one side of said disc to the other adjacent the leading edge of said slot to intercept the paint that is flung off said disc outwardly of said interceptor portion for trimming the upper edge of the spray pattern, and which also extends downwardly adjacent one side of said disc for collecting excess paint in the upper portion of said spray chamber and directing the excess paint back to the container.
A portable pump paint spraying device comprising a container for the paint to be sprayed, a housing removably connected to said container, said housing containing a spraying chamber with an egress slot therein, pump means for delivering paint to said spraying chamber from said container, a vertically oriented disc in said spraying chamber, means for directing the paint delivered to said spraying chamber by said pump means onto said disc, and drive means for simultaneously rotating said disc and driving said pump means, the rotation of said disc being operative by centrifugal force to impel a portion of the paint directed thereon through said egress slot as a spray, said drive means including an electric motor means positioned in a drive chamber in said housing, and an output shaft extending from said motor means into said spraying chamber, said disc being rotatably mounted on said output shaft, an eccentric mounted on said output shaft, a piston for said pump means reciprocally driven by rotation of said eccentric, said piston being operative to withdraw paint from said container during the suction stroke and deliver the withdrawn paint through a delivery tube to said spraying chamber during the compression stroke, said delivery tube extending into said spraying chamber and terminating in a nozzle in axially spaced relation to said disc for directing the pumped paint against one face of said disc, said pump means including a passage through which the paint is pumped for discharge into said delivery tube, said passage and delivery tube defining a substantially straight flow path from said container for the paint to said spraying chamber to minimize power requirements and facilitate pumping of paints of different types and viscosities, said electric motor means being a relatively small, low power electric motor having little inertia, the axial spacing between said nozzle and disc being such that when the power to said motor means is interrupted, the pressure of said pump means immediately drops off such that there is no longer sufficient pressure to direct a stream of paint out said nozzle with sufficient velocity to shoot across the space between said nozzle and disc and impinge upon said disc when said disc is substantially vertically oriented.
Dependencies are inferred from the claim text.