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.

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.

Abstract: A rotary damper has a movable valve supported on a support projection radially outwardly projecting from a shaft of a rotating member which is rotatably disposed in a chamber filled with a viscous fluid in a casing. Depending on the direction in which the rotating member rotates in the chamber, the movable valve opens or closes a fluid path defined between the movable valve and an inner circumferential surface of the casing. The movable valve may be angularly movably supported on the support projection which is of a circular cross-sectional shape or radially movably supported on the support projection which is of a rectangular cross-sectional shape.

Abstract: In electrophotographic apparatus of the type wherein a light image is projected upon a sensitized photosensitive sheet carried by a rotary drum to form an electrostatic latent image, the latent image is developed into a visible toner image and the toner image is transfer printed onto a recording paper, means is provided for permitting projection of the light image only when other devices of the apparatus tending to produce shock or vibration are not operated and for feeding the recording paper in exact synchronism with the rotation of the drum.