Oil pump

Details Oil pump Oil pump

1986-10-31

1989-01-31

Smith, Leonard E.

Pumps

Plural pumps with individual or relative control

Distributor adjustment

417492, 184 33, F04B 1902

Patent

active

048012530

ABSTRACT:
Instead of a hand-operated oil pump for supplying extra oil to the chain of a motor saw, two pumps according to the invention are disposed on the same shaft. The first one works always, while the second one can be switched on and off. The switching is effected by choking the feed of oil partly or completely to the second one. Both the pumps are controllable by decreasing the piston stroke.

REFERENCES:
patent: 895666 (1908-08-01), Nelson
patent: 904557 (1908-11-01), Nelson
patent: 1472947 (1923-11-01), Tharp
patent: 3704080 (1972-11-01), Cross
patent: 3763962 (1973-10-01), Gottlieb
patent: 3776369 (1973-12-01), Schrack
patent: 3844380 (1974-10-01), Batson
patent: 4008003 (1977-02-01), Pinkerton
patent: 4020760 (1977-05-01), Bryer
patent: 4043711 (1977-08-01), Seino
patent: 4094382 (1978-06-01), Lee
patent: 4231716 (1980-11-01), Kubota
patent: 4636147 (1987-01-01), Schweitzer

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