Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1983-07-25
1984-04-17
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
18832215, 188282, 267 6415, F16F 919
Patent
active
044429266
ABSTRACT:
A hydraulic damper comprising a tube with a bottom end thereof closed for containing hydraulic oil therein, a piston slidably fitted in the tube and partitioning the tube into upper and lower chambers which are filled with oil, a piston rod having one end thereof being secured to the piston by a hollow nut having a cavity opening to the lower chamber therein which is located on the side of lower chamber and the other end thereof projecting to the outside through a rod guide and sealing member which are fixed to the upper end of the tube and which seal the upper end of the tube, a pressurized gas chamber provided on the side of the lower chamber for compensating the changed volume of the piston rod within the tube, a first communicating path provided in the piston for communicating the upper and lower chambers, a second communicating path which serves to communicate the upper and lower chambers via the cavity provided in the hollow nut and which is provided in the piston rod on the side of the piston and the hollow nut, valves provided in the first and second communicating paths and serving to open in the opposite directions and serve to close or open the first and second communicating paths, whereby the damping force is generated when the oil filled into the tube flows from the upper chamber to the lower chamber and vice versa.
REFERENCES:
patent: 3570635 (1971-03-01), Takagi
patent: 3763970 (1973-10-01), Anderson
patent: 4185356 (1980-01-01), Kuivalainen et al.
patent: 4356898 (1982-11-01), Guzder et al.
Butler Douglas C.
Diefendorf R. R.
Tokiko Kabushiki Kaisha
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