Machine element or mechanism – Control lever and linkage systems – Variable output force
Patent
1978-03-10
1980-01-29
Scott, Samuel
Machine element or mechanism
Control lever and linkage systems
Variable output force
G05G 104
Patent
active
041855183
ABSTRACT:
The invention comprises an actuating lever assembly for the actuation of an adjustable member in a mechanical assembly, in particular, an adjustable member in a heating and ventilating assembly in a motor vehicle the lever assembly comprising: a support frame including a support surface and a guide means arranged substantially parallel to, and spaced apart from, said support surface; a movable actuating lever supported in said frame, one end of said actuating lever having a curved shape engageable with said support surface in such a manner that said actuating lever is both supported by, and can roll relative to, said support surface, between predetermined limits, on the application of force to the other end of said lever; guide means on said lever adjacent the center of curvature of said curved end and slidably engageable with said guide means on said support frame; and a connection point on said lever for the attachment thereto of a mechanical linkage between said adjustable member and said lever, which connection point is situated on said lever between said lever guide means and said curved end of the lever so that the ratio of the force applied to the other, free, end of the lever to the force applied at the connection point is at least 1:1.5 and varies continually as the lever is moved between said predetermined limits. The invention primarily produces a means of varying the force transmitted by the lever assembly during actuation of the lever. An important subsidiary feature of the invention is that it is possible to arrange that the free end of the actuating lever moves along a substantially rectilinear path as the lever moves from one of said predetermined limits in the assembly to the other of said predetermined limits in the assembly.
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General Motors Corporation
Phillips R. L.
Ratliff, Jr. Wesley S.
Scott Samuel
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