Brakes – Internal-resistance motion retarder – Using a rotary-type fluid damper
Patent
1990-04-30
1992-11-24
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Using a rotary-type fluid damper
16 52, 16 82, 188 821, 188 826, 1883225, 188291, 192 41S, 192 81C, 192 12A, 267195, 267221, 267155, 4236, F16D 5700
Patent
active
051655071
ABSTRACT:
According to the invention, there is provided a damper for a flapdoor that does not show any damping effect when its movable shaft of the damper is rotated with the door in one sense whereas it effectively damps the rotary movement of the flapdoor when the movable shaft is rotated with the door in the other sense, wherein a one-way clutch for engaging or disengaging the movable shaft with a movable member depending on the sense of rotation of the movable shaft to cause a viscous shearing drag in the viscous fluid contained in the damper and a power source constitute so many integral parts of a coil spring. A damper for a flapdoor having such an arrangement can have a simplified configuration as compared with a damper provided with a separate coil spring as power source and a separate one-way clutch and therefore can be realized with reduced dimensions. Moreover, since such a one-way clutch can be prepared from a coil spring without requiring any additional processes and by simply engaging a portion of the coil spring with the movable member, the rest of the coil spring functioning as power source, the damper can be realized at a significantly reduced cost.
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patent: 4830151 (1989-05-01), Numata
patent: 4893522 (1990-01-01), Arakawa
patent: 4938322 (1990-07-01), Sugasawara et al.
Butler Douglas C.
Sugatsune Industrial Co. Ltd.
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