Oil type damper

Details Oil type damper Oil type damper

1983-04-25

1987-01-27

Schran, Donald R.

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Closure checks

16 51, 16DIG9, E05F 502

Patent

active

046385282

ABSTRACT:
An oil type damper comprises a housing formed of a basic member in the shape of a blind tube and a cap, a rotating member and a braking disc adapted to rotate jointly and accommodated within the housing, viscous oil applied to the braking disc, and at least one flexible membrane opposed to the braking disc so as to allow the braking disc to be sealed in the housing as covered with the oil. In this oil damper, when the oil serving to brake the rotary motion of the rotating member connected to a given door expands in volume because of rising temperature, the flexible membrane is deformed under the pressure of the expanded oil enough to absorb the voluminal expansion of the oil and prevent otherwise possible leakage of the oil from the housing.

REFERENCES:
patent: 3861503 (1975-01-01), Nash
patent: 3882976 (1975-05-01), Nash
patent: 4342135 (1982-08-01), Matsuo et al.
patent: 4426752 (1984-01-01), Nakayama

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