Motors: expansible chamber type – With motive fluid valve – Contracting chamber exhaust valve controlled by expanding...
Patent
1992-02-06
1993-11-09
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Contracting chamber exhaust valve controlled by expanding...
91426, 91447, 60468, F15B 1108, F15B 1304
Patent
active
052592936
ABSTRACT:
In a hydraulic control device (S) comprising a double-acting hydraulic consumer (V) which is actuable by pressure via two working conduits (4, 5) and secured in at least one working direction by a load holding valve (H) which is hydraulically openable and closable in a controlled way, further comprising a control pressure conduit (12) which is connected to a control connection of the load holding valve and selectively actuable, as well as a damping throttle (13) arranged in control pressure conduit (12), there is provided a valve (15, 15', 15", 15'", 15.sup.IV) which during the controlled closing movement of load holding valve (H, 6) is automatically responsive to a delay of the controlled closing movement which is caused by the instantaneous viscosity of the pressure medium and/or a too tight setting of damping throttle (13) and is critical as to the after-running of hydraulic consumer (V) under a load (F), with the valve switching in such a case to passage and bypassing damping throttle (13). The valve offsets the effect of a pressure medium which is too cold, and/or a setting of the damping throttle that is too tight for an intended damping action with respect to a controlled closing of the load holding valve, and it ensures the rapid closing of the load holding valve as is required for stopping and holding the load, in particular during a safety shut-off operation.
REFERENCES:
patent: 4323095 (1982-04-01), Acerbi
patent: 4531449 (1985-07-01), Reith
patent: 4732076 (1988-03-01), Ewald
patent: 4854221 (1989-08-01), Tardy
patent: 4953639 (1990-09-01), Hammer et al.
National Fluid Association, Graphic Symbols For Fluid Power Diagrams Oct. 67, p. 12.
Pippenger, Fluid-Power Controls, 1959, p. 65.
Heilmeier & Weinlein Fabrik fuer Oel-Hydraulik GmbH & Co. KG
Look Edward K.
Nguyen Hoang
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