Hydraulic damper

Details Hydraulic damper Hydraulic damper

1982-11-04

1984-08-07

Butler, Douglas C.

Brakes

Internal-resistance motion retarder

Controlled by an operator remote from retarder

188318, 188319, F16F 934

Patent

active

044638396

ABSTRACT:
A hydraulic damper including a piston working in a cylinder and partitioning the interior thereof into two liquid chambers, a damping force generating valve device mounted on the piston to act both in extension and contraction strokes, a piston rod secured to the piston and having a coaxial bore and a radial hole to constitute a by-pass passage connecting the two liquid chambers by-passing the damping force generating valve device, a valve member provided in the by-pass passage and steppingly controlling the effective area thereof, and an actuating rod extending in the coaxial bore with the inner end being secured to the valve member. An operating mechanism is mounted on the piston rod and comprises an electromagnetic solenoid, a vertically reciprocable slide connected to the solenoid, a rotor connected to the actuating rod and having saw-teeth projections thereon, and a fixed guide cooperating with the rotor and the slide to rotate the rotor by one pitch of saw-teeth projections in response to one reciprocation of the slide.

REFERENCES:
patent: 4220228 (1980-09-01), Kato
patent: 4337850 (1982-07-01), Shimokura

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