Patent US3704811A successfully refreshed from Google Patents.
US3704811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable sandblaster
Assignee: Creative Ideas Inc
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Filing: 1970-07-24
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Granted: 1972-12-05
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Expires: 1990-07-24
Abstract
Abstract Particulate material is dispensed from a portable supply container by application of positive pressure in the open space of the container above the material to fluidize the same, and simultaneously, applying a vacuum through a venturi nozzle. The pressurized fluid for feeding the venturi nozzle and for fluidizing the particulate material preferably originates from a single source, a self-contained propellant tank positioned inside the supply container. An expansion chamber is provided at one end of the venturi nozzle and a dispensing orifice is positioned at the other end. Interconnecting transfer means between the expansion chamber and the open space may be a restricted passage or an open interface; in the latter embodiment a stream splitting lip being formed by said one end of said nozzle. A modified embodiment may be operated in either the upright or inverted position by providing alternative dispensing apertures in the top of the supply container for cooperation with a coupling stopper; sealing and transfer stoppers being positioned to automatically close off the unused aperture and supply pressure to the open space of the container.
Inventors
- 👤 Joseph T Harden Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:53
CPC Classifications
B; B24; B24C; B24C3/00; B24C3/02; B24C3/06; B05; B05B; B05B7/00; B05B7/14; B05B7/1404; B05B7/1472; B05B7/1481; B05B7/1486; B05B7/24; B05B7/2402; B05B7/2405; B05B7/2424; B05B7/2427; B65; B65D; B65D83/00; B65D83/14; B65D83/60; B65D83/66
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
227 words
A portable dispenser for particulate material comprising a container for holding a supply of said material, a supply passage extending into said container, a source of pressurized propellant fluid, a venturi nozzle connected to said source at one end and defining a dispensing orifice at the other end, said supply passage being connected to said venturi nozzle at a point of vacuum to create a dispensing operation by sucking said material through said supply passage and by projecting the same at a high velocity and final expansion out said orifice, an expansion chamber at the upstream end of said venturi nozzle to permit said propellant fluid to initially expand prior to entering the restricted portion of said venturi nozzle, a restricted passage upstream of said expansion chamber and valve means upstream of said passage to regulate the flow of said propellant fluid, said passage terminating in a restricted orifice opening into said chamber ejecting high velocity propellant fluid into the same for the initial expansion, and transfer means for interconnecting said pressurized source at said expansion chamber with said container to provide a positive pressure to said material, said pressure being sufficient to flow through said material and to thereby fluidize said material in said container and said supply passage for assisting in the material movement to said nozzle to enhance the efficiency of the dispensing operation.
Claim 2
Dependent Claim
227 words
A portable dispenser for particulate material comprising a container for holding a supply of said material, a supply passage extending into said container, a source of pressurized propellant fluid, a venturi nozzle connected to said source at one end and defining a dispensing orifice at the other end, said supply passage being connected to said venturi nozzle at a point of vacuum to create a dispensing operation by sucking said material through said supply passage and by projecting the same at a high velocity and final expansion out said orifice, an expansion chamber at the upstream end of said venturi nozzle to permit said propellant fluid to initially expand prior to entering the restricted portion of said venturi nozzle, a restricted passage upstream of said expansion chamber and valve means upstream of said passage to regulate the flow of said propellant fluid, said passage terminating in a restricted orifice opening into said chamber ejecting high velocity propellant fluid into the same for the initial expansion, and transfer means for interconnecting said pressurized source at said expansion chamber with said container to provide a positive pressure to said material, said pressure being sufficient to flow through said material and to thereby fluidize said material in said container and said supply passage for assisting in the material movement to said nozzle to enhance the efficiency of the dispensing operation.
Claim 3
Dependent Claim
26 words
The portable dispenser of claim 1 wherein said source of pressurized fluid includes a self-contained tank in said container and a propellant fluid in said tank.
Claim 4
Dependent Claim
33 words
The portable dispenser of claim 2 wherein said interconnecting transfer means includes a restricted passage directly communicating between said expansion chamber and an open space above the supply of material in said container.
Claim 5
Dependent Claim
31 words
The portable dispenser of claim 1 wherein said interconnecting transfer means includes an open interface between an open space above the supply of material in said container and said expansion chamber.
Claim 6
Dependent Claim
59 words
The portable dispenser of claim 4 wherein said pressurized source includes an intermediate restricted orifice to provide a defined stream of fluid upstream of and directed toward said venturi nozzle and said venturi nozzle includes a lip at said one end to intercept said stream of fluid and to split the same between said nozzle and said open space.
Claim 7
Dependent Claim
22 words
The portable dispenser of claim 1 wherein said expansion chamber, venturi nozzle and dispensing orifice are formed as an integral dispensing head.
Claim 8
Dependent Claim
54 words
The portable dispenser of claim 6 wherein said dispensing head is pivotally mounted on said container at a pivot axis spaced from said valve, said valve being connected to said expansion chamber and being operable to an open position when depressed, and means for pivoting said head toward said valve to operate the same.
Claim 9
Dependent Claim
154 words
A portable dispenser for particulate material capable of adaptation for operation in inverted and upright positions comprising a container for holding a supply of said material having a top formed thereon, a first aperture formed in said top communicating with the space formed above said material when said container is in the upright position, a second aperture formed in said top spaced a selected distance from said first aperture, a dip tube mounted in said second aperture and opening adjacent the bottom of said container, a dispensing head assembly for fitting on said top to dispense said material, a source of pressurized fluid and coupling means on said head assembly adapted to connect said soUrce of pressurized fluid with said head assembly and to selectively engage said first or second aperture to permit withdrawal of said material from the top or the bottom of said container in either the inverted or upright positions, respectively.
Claim 10
Dependent Claim
154 words
A portable dispenser for particulate material capable of adaptation for operation in inverted and upright positions comprising a container for holding a supply of said material having a top formed thereon, a first aperture formed in said top communicating with the space formed above said material when said container is in the upright position, a second aperture formed in said top spaced a selected distance from said first aperture, a dip tube mounted in said second aperture and opening adjacent the bottom of said container, a dispensing head assembly for fitting on said top to dispense said material, a source of pressurized fluid and coupling means on said head assembly adapted to connect said soUrce of pressurized fluid with said head assembly and to selectively engage said first or second aperture to permit withdrawal of said material from the top or the bottom of said container in either the inverted or upright positions, respectively.
Claim 11
Dependent Claim
27 words
The portable dispenser defined in claim 8 wherein said source of pressurized fluid includes a self-contained tank in said container and a propellant fluid in said tank.
Claim 12
Dependent Claim
49 words
The portable dispenser of claim 9 wherein is further provided first and second sealing stopper means spaced from said coupling means a distance equal to the selected space between said apertures so as to occupy the one of said apertures not in use by said coupling means for dispensing.
Claim 13
Dependent Claim
51 words
The portable dispenser of claim 10 wherein is further provided first and second transfer passages in communication with said pressurized source and extending to said first and second stopper means, respectively, to provide positive pressure to the space formed above said material of said container for assisting in the dispensing operation.
Claim 14
Dependent Claim
50 words
The portable dispenser of claim 11 wherein is further provided first and second depressions in said top spaced to the outside of said apertures the selected distance to receive the sealing stopper means not being utilized to cooperate with one of said apertures and to block off said transfer passages.
Claim 15
Dependent Claim
74 words
The portable dispenser of claim 10 wherein is provided a third aperture in said top communicating with said pressurized source, second coupling means for connecting said source to said dispensing head assembly, said first coupling means and said first and second sealing stopper means being positioned on a radial arc with respect to said second coupling means, whereby the same pressure source may be utilized for both modes of operation of said head assembly.
Claim 16
Dependent Claim
88 words
The portable dispenser of claim 9 wherein is provided an expansion chamber formed in said head assembly, a propellant dispensing head positioned in said expansion chamber, said dispensing head having a fluid transfer stem, a valve on said propellant tank to release said propellant through said transfer stem, a venturi nozzle communicating on one side with said expansion chamber and terminating on the opposite side in a dispensing orifice, said coupling means being connected to said venturi nozzle at a point of vacuum to create a dispensing operation.
Claim 17
Dependent Claim
68 words
The portable dispenser of claim 14 wherein is provided a winged operator lever in said head member, rod means engaging the top of said dispensing head, said winged operator lever being pivotally mounted on said operating rod and having lateral wings extending to the opposite sides of said dispensing head assembly, whereby simultaneous engagement by both hands of the operator is required to initiate operation of said dispenser.
Claim 18
Dependent Claim
34 words
The portable dispenser of claim 8 wherein is further provided deformable latch means to secure said dispensing head assembly and said container together in an operative condition for use in either of said positions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |