Lubrication – Lubricators – Force feed
Patent
1975-01-16
1976-02-17
Pinkham, Richard C.
Lubrication
Lubricators
Force feed
184 28, 222378, F16N 312, F16N 1308
Patent
active
039386236
ABSTRACT:
A grease gun having a hollow cylindrical body closed at one end and threadedly engaged at the other end with a removable delivery nozzle. Within the cylindrical body there is a central push rod having one end extending through a central aperture in the closed end thereof which is slidably retained to a plunger within the body by means of a locking ring, and a barrel spring around the push rod adapted to be compressed during retraction of the push rod and its associated plunger. The push rod comprises a circumferentially recessed groove between the locking ring and exposed end and an elongated detent portion in spaced relation to the circumferentially recessed groove near the exposed end. The removable delivery nozzle includes a central bore and a check valve therein adapted to be biased by the pressure of the grease in the cylindrical body in order to permit the passage of the grease therefrom into the removable delivery nozzle. A lock slide lever having a central aperture with a laterally reduced extension is slidably secured to the closed end of the cylindrical body, said laterally reduced extension being adapted to engage into the circumferentially reduced groove of the push rod when the push rod is retracted to the reduced groove position, and into the elongated detent portion of said push rod when it is in normal release position to control the stroke of the push rod. The closed end of the cylindrical body is provided with a vent hole for expulsion of entrapped air from the cylindrical body during the retraction of the push rod, and the removable delivery nozzle is provided with an orifice adapted to receive the male grease fitting of the part or apparatus which is being lubricated. A spring may be inserted between the closed end and a handle on the exposed end of the push rod to return the push rod after a power stroke, and a finger grip fastened to the cylinder body for one-handed operation.
REFERENCES:
patent: 1036205 (1912-08-01), Faul
patent: 1231442 (1917-06-01), Smith
patent: 1646477 (1927-10-01), Davis et al.
patent: 1721817 (1929-07-01), Goodman
patent: 2094423 (1937-09-01), Bernhardt
Vallender Leonard J.
Winston Richard C.
Kramer Arnold W.
Pinkham Richard C.
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