US4511065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manually actuated pump having pliant piston
Assignee: Individual
•
Filing: 1983-06-08
•
Granted: 1985-04-16
•
Expires: 2003-06-08
Abstract
Abstract A dispensing pump of the pressure accumulating type includes an assembly of a pump body and a separate piston member, the body including a closure cap for securing the assembly in fluid tight communication with the opening of a container of flowable product to be dispensed, a plunger/accumulator forming a variable volume pump chamber together with the piston and being reciprocable relative thereto, and a plunger head surrounding the plunger. The plunger has a vent seal for opening and closing a vent chamber defined around the piston. The closure cap is of a hard and durable material, while the separate piston is softer and more compliant which gives its lip seal good definition which avoids pump chamber leakage as it precisely conforms to the inner diameter of the plunger and to any irregularities thereof. Likewise, the plunger head is of a rigid and durable material, while the plunger is softer and more compliant so that its vent seal will better conform to the vent chamber wall, which it slidingly engages, to avoid leakage of product through the closed vent chamber. The piston has an inlet valve thereon which may be of a wide variety of types.
Inventors
- 👤 Douglas F. Corsette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:48
CPC Classifications
B; B05; B05B; B05B11/00; B05B11/01; B05B11/10; B05B11/1042; B05B11/1059; B05B11/0005; B05B11/0062; B05B11/0064; B05B11/0037; B05B11/0039; B05B11/0044; B05B11/1001; B05B11/1004; B05B11/1021; B05B11/1022; B05B11/1038; B05B11/104; B05B11/1061; B05B11/1063; B05B11/1073; B05B11/1074; F; F16; F16K; F16K15/00; F16K15/14; F16K15/16; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7834; Y10T137/7837; Y10T137/7879; Y10T137/7888; Y10T137/7891
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
325 words
A pressure accumulating dispensing pump comprising, an assembly comprising a pump body and a separate piston member, said body including a closure cap for securing said assembly in fluid tight communication with the opening of a container of flowable product to be dispensed, said assembly having a container vent opening therein, and said piston sealingly engaging said body and lying along the central axis thereof, plunger means comprising an annular plunger resiliently urged into a fully raised position and mounted for reciprocation on said piston member to define therewith a variable volume pump chamber, said piston member including an inlet valve, said plunger means further comprising a plunger head slideably disposed on said plunger and having a discharge passage adapted to be opened and closed by said plunger upon changes in pressure within said chamber upon reciprocation of said head, said assembly and said plunger head having cooperating means for limiting said head at said fully raised position, said piston having an annular lip seal in sealing engagement with said plunger, said assembly further comprising a cylindrical wall spaced from and surrounding said piston member to therewith define a vent chamber which includes said vent opening, an annular vent seal on said plunger means in sealing engagement with an inner surface of said wall for closing said vent chamber while said plunger is in its raised position and during an initial downstroke reciprocation thereof, said vent seal being further adapted to open said vent chamber upon a further downstroke reciprocation of said plunger, said plunger head and said body each being of a first material having a predetermined hardness for durability and strength, and said piston and said plunger each being of a second material which is softer and more compliant than said first material, for thereby enhancing said sealing engagements between said lip seal and said plunger and between said vent seal and said wall, to positively prevent leakage of product from said chambers.
Claim 2
Dependent Claim
325 words
A pressure accumulating dispensing pump comprising, an assembly comprising a pump body and a separate piston member, said body including a closure cap for securing said assembly in fluid tight communication with the opening of a container of flowable product to be dispensed, said assembly having a container vent opening therein, and said piston sealingly engaging said body and lying along the central axis thereof, plunger means comprising an annular plunger resiliently urged into a fully raised position and mounted for reciprocation on said piston member to define therewith a variable volume pump chamber, said piston member including an inlet valve, said plunger means further comprising a plunger head slideably disposed on said plunger and having a discharge passage adapted to be opened and closed by said plunger upon changes in pressure within said chamber upon reciprocation of said head, said assembly and said plunger head having cooperating means for limiting said head at said fully raised position, said piston having an annular lip seal in sealing engagement with said plunger, said assembly further comprising a cylindrical wall spaced from and surrounding said piston member to therewith define a vent chamber which includes said vent opening, an annular vent seal on said plunger means in sealing engagement with an inner surface of said wall for closing said vent chamber while said plunger is in its raised position and during an initial downstroke reciprocation thereof, said vent seal being further adapted to open said vent chamber upon a further downstroke reciprocation of said plunger, said plunger head and said body each being of a first material having a predetermined hardness for durability and strength, and said piston and said plunger each being of a second material which is softer and more compliant than said first material, for thereby enhancing said sealing engagements between said lip seal and said plunger and between said vent seal and said wall, to positively prevent leakage of product from said chambers.
Claim 3
Dependent Claim
31 words
The pump according to claim 1, wherein said piston member comprises a hollow piston defining an inlet passage and further comprises said cylindrical wall in sealed engagement with said pump body.
Claim 4
Dependent Claim
53 words
The pump according to claim 1, wherein said pump body further includes an upstanding tubular post lying along said axis and having an inlet passage, said piston comprising an axially movable sleeve member on said post for opening and closing said inlet passage in response to changes in pressure within said pump chamber.
Claim 5
Dependent Claim
42 words
The pump according to claim 3, wherein said post has a conical wall at its upper end with inlet ports therein, and said inlet valve comprises an annular flange of frustoconical configuration matching said conical wall for opening and closing said ports.
Claim 6
Dependent Claim
32 words
The pump according to claim 4, wherein said post has an annular stop shoulder, the lower end of said sleeve sealingly engaging said shoulder in a valve closing position of said sleeve.
Claim 7
Dependent Claim
15 words
The pump according to claim 3, wherein said pump body further includes said cylindrical wall.
Claim 8
Dependent Claim
60 words
The pump according to claim 1, wherein said pump body further includes an upstanding tubular post lying along said axis and having an inlet passage, said piston comprising a sleeve member mounted on said post against axial movement, an upper end of said post defining a valve seat, and said inlet valve comprising an annular resilient valve having ports therein.
Claim 9
Dependent Claim
44 words
The pump according to claim 7, wherein said post and the lower end of said sleeve have sealingly engaging conical surfaces which flare outwardly from said central axis for sealing said pump chamber against entry of air during the suction stroke of said plunger.
Claim 10
Dependent Claim
53 words
The pump according to claim 1, wherein said pump body further includes an upstanding post lying along said axis and having an inlet passage, said piston comprising a sleeve member fixed on said post, an upper end of said post defining a valve seat, and said inlet valve comprising a flexible flap valve.
Claim 11
Dependent Claim
34 words
The pump according to claim 7, wherein said sleeve engages said post to define an annular packing seal for sealing said pump chamber against entry of air during the suction stroke of said plunger.
Claim 12
Dependent Claim
13 words
The pump according to claim 9, wherein said piston includes said cylindrical wall.
Claim 13
Dependent Claim
37 words
The pump according to claim 7, wherein said piston includes said cylindrical wall and a lock ring, said piston being rotatably mounted on said post, and said sleeve engaging said post to define an annular packing seal.
Claim 14
Dependent Claim
53 words
The pump according to claim 2, wherein annular overlapping flanges extend radially from said cylindrical wall and from said pump body, an annular groove provided in one of said flanges receiving an annular tongue provided in the other of said flanges and defining said sealed engagement between said piston and said pump body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |