US3780830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cartridge-type grease guns
Assignee: K P MANUF Inc
•
Filing: 1972-04-24
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Granted: 1973-12-25
•
Expires: 1992-04-24
Abstract
Abstract An improved grease gun of the plunger type which uses replaceable grease cartridges. The grease gun consists of a cylindrical container adapted to receive an open ended cylindrical grease cartridge. The plunger is spring biased to urge grease from the cartridge into a discharging device of the piston displacement type. The plunger is guideably carried within the cylindrical container by an elongated rod having a handle portion projecting rearwardly from the container. To insure proper insertion of the plunger into the rearward open end of the grease cartridge, abutment means are disposed at an intermediate point on the elongated rod and movable therewith. Insertion of a fresh grease cartridge into the cylindrical container from its forward end causes the plunger to seat on the cartridge mouth. With the gun assembled for use, forward movement of the rod causes the abutment means to engage and force the plunger into a proper position within the cartridge mouth.
Inventors
- 👤 R Helgerud
- 👤 E Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:59
CPC Classifications
F; F16; F16N; F16N3/00; F16N3/10; F16N3/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
164 words
A grease gun comprising: a. a cylindrical container having forward and rearward ends and adapted to receive an open ended cylindrical grease cartridge; b. discharge means including an outlet associated with the forward end of the cylindrical container for receiving grease from the cartridge and operable to discharge a quantity of grease to said outlet; c. an elongated rod disposed in the cylindrical container and longitudinally movable therein, one end of the elongated rod projecting beyond the rearward end of the cylindrical container; d. plunger means slidably disposed on the elongated rod and constructed for sealable slidable movement in the cartridge to force grease therefrom; e. means for urging the plunger means toward the forward end of the cylindrical container; f. and means disposed at an intermediate point on the elongated rod rearwardly of the plunger means and movable therewith for abuttably engaging and forcing the plunger means into the rearward open end of the grease cartridge with forward movement of the elongated rod.
Claim 2
Dependent Claim
164 words
A grease gun comprising: a. a cylindrical container having forward and rearward ends and adapted to receive an open ended cylindrical grease cartridge; b. discharge means including an outlet associated with the forward end of the cylindrical container for receiving grease from the cartridge and operable to discharge a quantity of grease to said outlet; c. an elongated rod disposed in the cylindrical container and longitudinally movable therein, one end of the elongated rod projecting beyond the rearward end of the cylindrical container; d. plunger means slidably disposed on the elongated rod and constructed for sealable slidable movement in the cartridge to force grease therefrom; e. means for urging the plunger means toward the forward end of the cylindrical container; f. and means disposed at an intermediate point on the elongated rod rearwardly of the plunger means and movable therewith for abuttably engaging and forcing the plunger means into the rearward open end of the grease cartridge with forward movement of the elongated rod.
Claim 3
Dependent Claim
30 words
The grease gun defined by claim 1, wherein said intermediate point is disposed to effect abutting engagement of the plunger means with the elongated rod in its approximate operating position.
Claim 4
Dependent Claim
23 words
The grease gun defined by claim 1, wherein the means for abuttably engaging the plunger means comprises a protuberance on the elongated rod.
Claim 5
Dependent Claim
38 words
The grease gun defined by claim 1, wherein the means for abuttably engaging the plunger means comprises a sleeve member affixed to the elongated rod, the forward end of the sleeve member being disposed at said intermediate point.
Claim 6
Dependent Claim
18 words
The grease gun defined by claim 1, wherein the discharge means is removably connected to the cylindrical container.
Claim 7
Dependent Claim
35 words
The grease gun defined by claim 1, wherein the discharge means comprises a cylinder commonly communicating with the cylindrical container and the outlet, and a manually operable piston sealably and slidably disposed in the cylinder.
Claim 8
Dependent Claim
22 words
The grease gun definEd by claim 1, wherein the elongated rod further comprises a handle disposed on the rearward projecting end thereof.
Claim 9
Dependent Claim
27 words
The grease gun defined by claim 1, and further comprising means for venting air entrapped in the cylindrical container between the grease cartridge and the discharge means.
Claim 10
Dependent Claim
28 words
The grease gun defined in claim 8, wherein the venting means comprises a vent hole disposed in the wall of the cylindrical container at the forward end thereof.
Claim 11
Dependent Claim
29 words
The grease gun defined by claim 1, and further comprising a removable cap member covering the rearward end of the cylindrical container, the elongated rod projecting through said cap.
Claim 12
Dependent Claim
25 words
The grease gun defined by claim 10, wherein the urging means comprises a coil spring compressibly disposed between the plunger means and the removable cap.
References Cited (Backward Citations)
US2409619A
Cited
US2915226A
Cited
US3174657A
Cited
GB992344A
Cited
US3300100A
Cited
US3409185A
Cited
US3612359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |