US3612359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand operated multiload grease gun
Assignee: Individual
•
Filing: 1969-09-02
•
Granted: 1971-10-12
•
Expires: 1989-09-02
Abstract
Abstract A hand-operated grease gun adapted to use grease in either bulk form or cartridge form includes a grease container having a cylindrical barrel and a cylindrical sidewall of reduced diameter formed integrally with the barrel portion of the container and connected to it by means of a peripheral shoulder which defines a number of curved slots which admit passage through the container wall in an axial direction. A plunger assembly is mounted within the container for reciprocation therein; and it includes a flexible, resilient sealing means for selectively sealing either with the interior surface of the barrel or a grease cartridge, if it is used. Latch members are connected to the plunger assembly for moving with it; and as it is retracted into the rear portion of the container, the latch members pass through the slots in the shoulder of the barrel to extend exterior of and adjacent to the rear cylindrical sidewall of reduced diameter. Each of the latch members includes a laterally projecting finger so that when the plunger assembly is rotated, the latch members hold the plunger assembly in its retracted state for receiving a grease cartridge.
Inventors
- 👤 Edwin P Sundholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:21
CPC Classifications
F; F16; F16N; F16N3/00; F16N3/10; F16N3/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
177 words
In a hand-operated gun adapted to receive grease in bulk or cartridge form, including a grease container having a forward and a rear end with a cylindrical barrel at its forward end, wherein the improvement comprises: said container defining at its rear end a cylindrical sidewall of reduced diameter connected to said barrel by means of a peripheral connecting shoulder defining slot means admitting passage through said container in an axial direction; and a plunger assembly adapted for reciprocation within said container and including flexible resilient sealing means for sealing engagement with said barrel, and latch means connected to said plunger assembly for moving therewith including rearwardly projecting shank means extending axially and rearwardly of said container for passing through said slot means when said plunger is drawn to the rear of said container and extending exterior of and adjacent to said rear cylindrical sidewall of reduced diameter and adapted to selectively lock with said shoulder, said reduced cylindrical wall portion of said container having an axial dimension longer than the axial dimension of said latch means.
Claim 2
Dependent Claim
177 words
In a hand-operated gun adapted to receive grease in bulk or cartridge form, including a grease container having a forward and a rear end with a cylindrical barrel at its forward end, wherein the improvement comprises: said container defining at its rear end a cylindrical sidewall of reduced diameter connected to said barrel by means of a peripheral connecting shoulder defining slot means admitting passage through said container in an axial direction; and a plunger assembly adapted for reciprocation within said container and including flexible resilient sealing means for sealing engagement with said barrel, and latch means connected to said plunger assembly for moving therewith including rearwardly projecting shank means extending axially and rearwardly of said container for passing through said slot means when said plunger is drawn to the rear of said container and extending exterior of and adjacent to said rear cylindrical sidewall of reduced diameter and adapted to selectively lock with said shoulder, said reduced cylindrical wall portion of said container having an axial dimension longer than the axial dimension of said latch means.
Claim 3
Dependent Claim
36 words
The structure of claim 1 wherein said grease container further comprises an inwardly inclined frustoconical wall member interposed between said shoulder and said barrel for guiding said latch means into said slot means on said shoulder.
Claim 4
Dependent Claim
165 words
In a hand-operated grease gun the combination of a grease container having a forward cylindrical barrel, a rear cylindrical sidewall of lesser diameter than said barrel and said rear sidewall and defining at least one slot admitting passage in a direction parallel to the axis of said container; and a plunger assembly including sealing means for sealingly engaging the interior surface of said barrel and rearwardly extending latch means connected to said sealing means and adapted to pass through said slot in said container and adjacent the exterior surface of said rear sidewall thereof for engaging the exterior surface of said shoulder flange when said plunger assembly is rotated to hold said plunger assembly in a retracted position, said rear cylindrical sidewall of said container extended rearwardly beyond the furthest projection of said latch means and immediately inward thereof to protect the same against accidental dislodgment or deformation and to prevent the occurrence of projecting edges when the plunger assembly is held in retracted position.
Claim 5
Dependent Claim
165 words
In a hand-operated grease gun the combination of a grease container having a forward cylindrical barrel, a rear cylindrical sidewall of lesser diameter than said barrel and said rear sidewall and defining at least one slot admitting passage in a direction parallel to the axis of said container; and a plunger assembly including sealing means for sealingly engaging the interior surface of said barrel and rearwardly extending latch means connected to said sealing means and adapted to pass through said slot in said container and adjacent the exterior surface of said rear sidewall thereof for engaging the exterior surface of said shoulder flange when said plunger assembly is rotated to hold said plunger assembly in a retracted position, said rear cylindrical sidewall of said container extended rearwardly beyond the furthest projection of said latch means and immediately inward thereof to protect the same against accidental dislodgment or deformation and to prevent the occurrence of projecting edges when the plunger assembly is held in retracted position.
Claim 6
Dependent Claim
37 words
The structure of claim 3 wherein said container includes a frustoconical surface between said barrel and said shoulder flange for guiding said latch means into said slot and through said container when said plunger assembly is retracted.
Claim 7
Dependent Claim
55 words
The structure of claim 3 wherein said container comprises a first integral part providing said barrel and shoulder flange, and a second integral part providing said rear sidewall of reduced diameter and a transverse end plate defining a central aperture for receiving and guiding a plunger rod on which said plunger assembly is slidably mounted.
Claim 8
Dependent Claim
56 words
The structure of claim 3 wherein said container comprises a first integrally formed part providing said barrel, said shoulder flange and said rear sidewall of reduced diameter, and a second part providing a transverse end plate secured to said rear sidewall for receiving and guiding a plunger rod on which said plunger assembly is slidably mounted.
References Cited (Backward Citations)
US2361126A
Cited
US2714474A
Cited
US2790424A
Cited
US2759640A
Cited
US2815151A
Cited
US3059980A
Cited
US3430735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |