Power plants – Pressure fluid source and motor – Pulsator
Patent
1988-05-24
1990-04-24
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
60569, 60591, 745021, 350637, F15B 702
Patent
active
049189204
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a hydraulic remote control device for at least one adjustable and/or lockable controlled member mounted on a support, such as a rear view mirror, particularly an external rear view mirror for an automobile vehicle, whose orientation it is desired to adjust from the driver's seat inside the vehicle, the hydraulic remote control device according to the invention also being utilizable to adjust the position of other members requiring positioning by pivoting, particularly about two axes at right angles to one another.
Among the numerous known constructions of devices arranged for this purpose, the invention relates more precisely to hydraulic remote control devices of the type comprising: comprising: a flexible walled deformable bag containing a hydraulic fluid, having a variable volume chamber, and receiver, positioning transmitter of at least one hydraulic circuit is mechanically deformed by the manual actuation of the control member, in such manner that hydraulic fluid contained therein is transferred to at least one of the receivers connected thereto, and the receivers mechanically connect the controlled member to its support in order to modify the position of the controlled member relative to its support in response to the operations of the control member.
A device of this kind is described in the European Patent Application published under No. 0152 219, which lists the very important advantages provided by a device of this kind in comparison with previous constructions of the prior art comprising transmissions by levers, linkages or rod systems, movement transmissions utilizing cables, or else electric motors, these advantages being briefly outlined below. Arrangements using levers, although generally fairly simple in construction, do not make it possible to control the external rear view mirror situated on the passenger's side from the driver's seat, because the required path is not a straight line; the disadvantages of these arrangements are therefore connected with the presence of bends, the considerable weight of linkages, and friction, which makes such embodiments usually scarcely progressive. Arrangements comprising three movement transmission cables are easier to instal than lever arrangements, but they do not make it possible to control the orientation of the external rear view mirror on the passenger's side because, as the result of friction, the effective length of the control cables is limited to about 50 centimeters, while beyond that length the operating forces increase very substantially and have the consequence that the control device is scarcely progressive and is very difficult to adjust. Finally, devices using electric motors make it possible to control all the external rear view mirrors on the vehicle from the driver's seat, irrespective of the path followed by the electric wires between these rear view mirrors and the parts of the instrument panel and/or supports disposed inside the vehicle and accessible to the driver; however, the major disadvantage of arrangements of this kind is the cost of the electric motors and the space which they require in the rear view mirrors.
In the different examples of embodiment of the hydraulic control device which are described in the aforesaid European patent application, the manually actuated control member is always a manipulator handle or stick pivotally mounted or articulated on the cover of a casing containing the flexible walled chambers of the positioning transmitters. The manipulator handle or stick is always mechanically connected to at least one rigid member, which is likewise mounted inside the casing, in such a manner that the pivoting movements made by the user with the manipulator handle or stick are transmitted with or without stepping down of the transmission ratio to at least one of said internal rigid members, which has or have the effect of compressing at least one flexible walled deformable bag of the positioning transmitters.
The hydraulic remote control device forming the object of the abovement
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patent: 4768871 (1988-09-01), Mittelhauser et al.
Britax (GECO) S.A.
Look Edward K.
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