Brakes – Internal-resistance motion retarder – Valve structure or location
Patent
1982-12-16
1985-04-23
Reger, Duane A.
Brakes
Internal-resistance motion retarder
Valve structure or location
188320, F16F 9348
Patent
active
045124477
ABSTRACT:
A hydraulic damper includes a cylinder containing hydraulic liquid therein, a piston working in the cylinder and partitioning the interior of the cylinder into first and second liquid chambers, a piston rod secured to the piston and extending to the outside, and a disc valve mounted on each side of the piston for generating damping force. The disc valve exposed to the first liquid chamber comprises at least three mutually overlapping annular discs. The outer circumference of a first disc which is located contiguous to the piston is easily deflectable, and a second disc which is located contiguous to the first disc has at least one opening, one end of which is communicated permanently with the first liquid chamber. The liquid flow flowing through the opening is intercepted by the outer circumference of the first disc when the piston moves toward the second liquid chamber, and a liquid flow passing through the opening is established due to the deflection of the first disc when the piston moves toward the first liquid chamber, thereby decreasing the damping force.
REFERENCES:
patent: 2316924 (1943-04-01), Whisler
patent: 3029903 (1962-04-01), Wasdell
patent: 3837445 (1974-09-01), Pierle
patent: 4060155 (1977-11-01), Duckett
Reger Duane A.
Tokico Ltd.
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