Rotary damper with self-standing mechanism

Details Rotary damper with self-standing mechanism Rotary damper with self-standing mechanism

1998-04-13

1999-03-02

Graham, Matthew C

Brakes

Operators

Automatic

188 8284, F16F 953

Patent

active

058758747

ABSTRACT:
A rotary damper for use with a toilet lid has a damper shaft rotatably supported by a damper housing, a collar of synthetic resin fitted over the damper shaft for rotation therewith, and a casing of synthetic resin fixed to the damper housing and disposed around the collar for rotation relative thereto. The collar has a pair of diametrically opposite axial ridges disposed on the outer circumferential surface thereof and projecting radially outwardly. The casing has a pair of diametrically opposite cantilevered resilient arms defined by respective slits in the circumferential wall thereof. The cantilevered resilient arms have respective axial teeth disposed on the inner circumferential surface of the casing and projecting radially inwardly for engagement with the axial ridges, respectively. When the collar rotates in one direction, respective slanting surfaces of the axial ridges engage and move over the respective axial teeth, displacing the axial teeth radially outwardly against the resiliency of the cantilevered resilient arms. After the axial ridges move past the respective axial teeth, respective step surfaces of the axial ridges are locked by the axial teeth, retaining the collar and hence the damper shaft in a rotated position unless strong forces are applied to rotate the damper shaft backward.

REFERENCES:
patent: 2187923 (1940-01-01), Winkleman
patent: 3017964 (1962-01-01), von Thuengen
patent: 3232597 (1966-02-01), Gaydecki
patent: 3523593 (1970-08-01), Karasick
patent: 3718212 (1973-02-01), Havranek
patent: 3811715 (1974-05-01), Brudy

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