Boots – shoes – and leggings
Patent
1987-08-24
1990-03-06
Lall, Parshotam S.
Boots, shoes, and leggings
36442401, 318466, 318467, 296 651, G06F 1520
Patent
active
049071530
ABSTRACT:
In an automobile seat mounted for movement by an electric motor connected between a battery and ground, an improved control system for the motor. There is a power transistor connected in series with the motor. Digital logic is connected for controlling the power transistor. A switch is operably connected for inputting direction control requests for the motor to the digital logic means. Finally, there is a tachometer driven by the motor and having an output connected to the digital logic means for indicating when the motor is moving. The digital logic includes logic for applying a series of pulses of increasing duration to the power transistor when starting the motor to affect a pseudo up ramp power input to the motor and logic for applying a series of pulses of decreasing duration to the power transistor when stopping the motor to affect a pseudo down ramp power input to the motor. There is logic for turning off the power transistor if movement of the motor has not occurred by a pre-established time following the application of power to the motor and logic for turning off the power transistor if the motor stops at any time during the application of power to the motor. Provision is made to prevent motor movement during lockup and to prevent the motor from going to the ends of its motion after the first time that the end point has been reached. There is also provision in the preferred embodiment for tilting an automobile seat controlled by the motor to compensate for road banking and centrifugal forces on the driver.
REFERENCES:
patent: 4204255 (1980-05-01), Cremer
patent: 4401928 (1983-08-01), Kamijo et al.
patent: 4404632 (1983-09-01), Harada et al.
patent: 4434468 (1984-02-01), Caddick et al.
patent: 4470108 (1984-09-01), Kato et al.
patent: 4528491 (1985-07-01), Takeuchi et al.
Lall Parshotam S.
Streck Donald A.
Trans V.
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