Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Position responsive
Patent
1977-02-11
1979-02-13
Cohen, Irwin C.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Position responsive
91 31, 91186, 91189R, 91395, 91421, F01B 104, F15B 1306, F15B 1522
Patent
active
041389280
ABSTRACT:
This invention is directed to fluid actuated apparatus for automatically restricting the flow of fluid in conduits leading to and/or from fluid actuated cylinder means for causing pivotal movement of a member, such as the turret carrying the boom and bucket of a backhoe, so that the speed of pivotal movement of the member is rapid during one portion of its pivotal movement but is automatically reduced during a predetermined portion of its subsequent pivotal movement, thereby minimizing failures of the components of the member and the fluid system and improving the braking action for reducing the speed of pivotal movement of the member. In one embodiment, both the flow of fluid to the operative fluid actuated cylinder and the flow of fluid from the inoperative fluid actuated cylinder are restricted substantially simultaneously by fluid restricting means so that the linear velocities of the rods of both cylinders are reduced substantially simultaneously by the fluid restricting means. The apparatus also includes a restricting valve means which includes fluid restricting piston means. The fluid restricting piston means is free from springs, cams and cam rollers and is economical to manufacture and to maintain.
REFERENCES:
patent: 1283179 (1918-10-01), Hennebohle
patent: 1902018 (1933-03-01), Davis
patent: 2169470 (1939-08-01), Miller et al.
patent: 2735404 (1956-02-01), Komph, Sr.
patent: 3120157 (1964-02-01), Mello
patent: 3407946 (1968-10-01), Pilch
patent: 3835751 (1974-09-01), Cowan
Cohen Irwin C.
Thompson Robert L.
Ware Machine Service Inc.
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