Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1996-12-09
1998-02-24
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
744248B, B60T 811
Patent
active
057205310
ABSTRACT:
A variable pitch screw driver system includes a rotatable drive nut powered by a motor actuator. A base screw having a fixed pitch extends through the drive nut and is linearly translatable in response to rotation of the drive nut. The base screw carries a pin that follows a secondary helical screw. Linear translation of the base screw is altered by tracking of the pin along the helical screw such that rotation of the base screw is selectively effected simultaneously with rotation of the drive nut resulting in an effective variable pitch of the screw driver. Linear translation of the base screw effects linear translation of a piston at a variable rate.
REFERENCES:
patent: 3549210 (1970-12-01), Birge et al.
patent: 4653815 (1987-03-01), Agarwal et al.
patent: 5069081 (1991-12-01), Morita
patent: 5303604 (1994-04-01), Mayfield
patent: 5433514 (1995-07-01), Tsukamoto et al.
General Motors Corporation
Graham Matthew C.
Sedlar Jeffrey A.
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