Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1984-09-18
1989-01-31
Kashnikow, Andres
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
18832215, 188299, F16F 950, F16F 934, F16K 510
Patent
active
048009946
ABSTRACT:
A hydraulic damper of adjustable damping force type includes a cylinder containing hydraulic liquid therein, a piston working in the cylinder and partitioning the interior thereof into first and second liquid chambers, a piston rod secured to the piston and extending through the first liquid chamber to the outside of the cylinder, a valve mechanism mounted on the piston for generating damping force both in extension and contraction strokes of the damper, and an adjusting mechanism for adjusting the damping force. The adjusting mechanism includes a coaxial bore formed in the piston rod and communicating permanently with the first liquid chamber through a radial hole in the piston rod, a tubular nut for securing the piston to the piston rod, a tubular guide fitted in the tubular nut and having first and second series of circumferentially spaced orifice openings of different effective area, a shutter rotatably disposed in the guide for selectively opening and closing the orifice openings, a control rod secured to the shutter and extending through the bore in the piston rod, a check valve provided in the nut and permitting liquid flow through the first series of orifice openings only in one direction, and the second series of orifice openings forming a passage by-passing the check valve.
REFERENCES:
patent: 4527676 (1985-07-01), Emura et al.
patent: 4620619 (1986-11-01), Emura et al.
Ashiba Masahiro
Imaizumi Tomio
Kashnikow Andres
Potosnak Richard
Tokico Ltd.
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