US3655101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plunger assembly for hand grease guns
Assignee: Superior Manufacturing Co
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Filing: 1970-05-15
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Granted: 1972-04-11
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Expires: 1990-05-15
Abstract
Abstract A plunger assembly is provided for slidable engagement with the plunger rod in hand grease guns, which grease guns are adapted to use both cartridge-packed grease and bulk-loaded grease. The plunger, in cross section, is of essentially W-shaped configuration and comprises a sleeve having a bore formed therethrough for slidably receiving the rod. A transverse web is carried by the forward portion of the sleeve and extends radially outwardly and, at its periphery, is attached to an interior support section which extends outwardly and rearwardly of the web to proximate the inside diameter of the grease barrel. An annular flexing and sealing wall is carried by the periphery of the support section and extends outwardly to beyond the inner diameter of the grease barrel and then forwardly and inwardly to a position forward of the sleeve and inward of the inner diameter of a grease cartridge. An annular lip is formed on the inner side of the wall and engages washer means between the lip and the forward portions of the transverse web.
Inventors
- 👤 Chester Dorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:40
CPC Classifications
F; F16; F16N; F16N3/00; F16N3/10; F16N3/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
276 words
In a hand grease gun of the kind including a cylindrical grease barrel with a forward end and a rearward end, and a rod extending along the longitudinal axis thereof, the grease gun being adapted to use both cartridge-packed and bulk-filled greases, the improvement consisting of a plunger assembly; said plunger assembly comprising: a. a sleeve having a forward end and a rearward end and having a bore formed therethrough for slidably receiving the rod; b. a transverse web carried by the forward portion of said sleeve and extending radially outwardly of said sleeve; c. an interior support section attached to the periphery of said transverse web and extending radially outwardly and rearwardly of said transverse web to proximate the inner diameter of the grease barrel; d. an annular flexing and sealing wall carried by the periphery of said support section and extending outwardly thereof to slightly beyond the inner diameter of the grease barrel, said wall then extending forwardly of said forward end of said sleeve and inwardly of the inner diameter of a grease cartridge adapted for insertion in the grease barrel; e. an annular lip formed on the inner side of said wall forwardly of the forward end of said sleeve; f. washer means of circular configuration having a diameter substantially equal to the inside diameter of the annular wall rearward of said annular lip engaged on the forward side thereof by the rearward portion of said annular lip and on the rearward side thereof by the forward side of said transverse web, said washer means having a bore aligned with said bore in said sleeve formed therethrough for slidably receiving the rod.
Claim 2
Dependent Claim
276 words
In a hand grease gun of the kind including a cylindrical grease barrel with a forward end and a rearward end, and a rod extending along the longitudinal axis thereof, the grease gun being adapted to use both cartridge-packed and bulk-filled greases, the improvement consisting of a plunger assembly; said plunger assembly comprising: a. a sleeve having a forward end and a rearward end and having a bore formed therethrough for slidably receiving the rod; b. a transverse web carried by the forward portion of said sleeve and extending radially outwardly of said sleeve; c. an interior support section attached to the periphery of said transverse web and extending radially outwardly and rearwardly of said transverse web to proximate the inner diameter of the grease barrel; d. an annular flexing and sealing wall carried by the periphery of said support section and extending outwardly thereof to slightly beyond the inner diameter of the grease barrel, said wall then extending forwardly of said forward end of said sleeve and inwardly of the inner diameter of a grease cartridge adapted for insertion in the grease barrel; e. an annular lip formed on the inner side of said wall forwardly of the forward end of said sleeve; f. washer means of circular configuration having a diameter substantially equal to the inside diameter of the annular wall rearward of said annular lip engaged on the forward side thereof by the rearward portion of said annular lip and on the rearward side thereof by the forward side of said transverse web, said washer means having a bore aligned with said bore in said sleeve formed therethrough for slidably receiving the rod.
Claim 3
Dependent Claim
33 words
The plunger assembly of claim 1 wherein said sleeve, said transverse web, said support section, said annular wall, and said annular lip are of integral molded construction and are formed from resilient material.
Claim 4
Dependent Claim
24 words
The plunger assembly of claim 2 wherein said annular wall is relatively more flexible and resilient than said support section and said annular lip.
Claim 5
Dependent Claim
92 words
The plunger assembly of claim 3 wherein said annular flexing and sealing wall extends arcuately forwarDly and outwardly of said support section to slightly beyond the inner diameter of the grease barrel and then arcuately forwardly and inwardly to proximate the inner diameter of a grease cartridge adapted for insertion in the grease barrel proximate the lateral plane of the forward end of said sleeve; said wall then extends forwardly to said rearward portion of said annular lip and then obliquely forwardly and inwardly to the forwardmost portion of said annular wall.
Claim 6
Dependent Claim
34 words
The plunger assembly of claim 4, wherein said support section extends rearwardly of said rearward end of said sleeve and wherein an annular void is provided between said support section and said annular wall.
Claim 7
Dependent Claim
29 words
The plunger assembly of claim 5 wherein the diameter of said washer means is substantially equal to the outside diameter of the annular wall at the forwardmost portion thereof.
Claim 8
Dependent Claim
22 words
The plunger assembly of claim 6 wherein a retainer engages the forward, outer portion of said sleeve rearwardly of said transverse web.
Claim 9
Dependent Claim
13 words
The plunger assembly of claim 7, wherein the retainer is of frusto-conical configuration.
Claim 10
Dependent Claim
20 words
The plunger assembly of claim 8, wherein an annular spring support extends outwardly of the forward edge of said retainer.
Claim 11
Dependent Claim
50 words
The plunger assembly of claim 9, wherein said washer means comprises: a rearward circular washer; a forward circular washer having a raised central portion and having notches formed through said central portion communicating with said bore; said washers being superposed and affixed together with said raised central portion extending forwardly.
Claim 12
Dependent Claim
35 words
The plunger assembly of claim 5, wherein at least one aperture is formed through said washer means radially outwardly of said transverse web such that grease can pass through said aperture into said annular void.
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |