US 4,392,392 A · Electrically-operated roller door operating mechanism

Abstract

An electrically operated roller door driving mechanism for operating a roller door comprising a reversible electrical motor fixedly mounted to one of the roller door supporting drum wheels and housed within the core of the roller door curtain, the motor and drum wheel being arranged to rotate simultaneously, and a ring gear operatively associated with said motor via a reduction gear mechanism, the ring gear being capable of being held stationary with respect to the rotating drum wheel but also being capable of rotating in unison with the drum wheel to thereby enable the roller door to be manually opened and closed in the event of a motor malfunction or power failure.

Claims14

Dependent claims

A driving mechanism for coiling a flexible curtain thereabout comprising:

(a) a transverse shaft;
(b) first and second drum wheels mounted for rotation about the axis of said shaft at axially spaced apart locations;
(c) a reversible electric motor fixedly mounted on the side of said first drum wheel facing said second drum wheel between the center and the rim of said drum wheel to bodily rotate about the axis of said shaft with rotation of said first drum wheel;
(d) a reduction gear mechanism affixed to and operatively associated with said motor with a drive shaft projecting through said first drum wheel at a location between the axis of said drum wheel and the rim of said drum wheel and terminating in a drive pinion positioned on the opposite side of said first drum wheel;
(e) a ring gear in meshing engagement with said pinion mounted adjacent said opposite side of said first drum wheel, said ring gear having its axis concentric with the axis of said shaft;
and
(f) locking means to prevent rotation of said ring gear.

4 more elements

A driving mechanism by which a roller door curtain or shutter can be wound onto or unwound about a pair of supporting axially spaced drum wheels which are supported for rotation about the transverse axis of a shaft, one drum wheel adjacent each end thereof, said mechanism comprising:

(a) a reversible electric motor;
(b) attachment means securing said motor to one of said drum wheels between the axis and the rim thereof whereby when said one of said drum wheels is rotated said motor simultaneously rotates bodily about said shaft, said motor being located adjacent the inner side of said one of said drum wheels and having operatively fixed thereto a reduction gear mechanism with a drive shaft extending through said one of said drum wheels and terminating in a driving pinion;
(c) a stationary body spaced axially outwardly from said one of said drum wheels;
(d) a ring gear positioned between said one of said drum wheels and said stationary body, said ring gear being in permanent meshing engagement with said pinion;
and
(e) releasable locking means between said ring gear and said stationary body so arranged that with said ring gear held stationary by engagement of said releasable locking means, actuation of said motor drives said pinion around said stationary ring gear to thereby rotate said drum wheel and in turn selectively raise or lower the door curtain, but disengagement of said releasable locking means permits said ring gear to rotate in unison with said one of said drum wheels to in turn allow the door curtain to be manually raised and lowered.

3 more elements

Dependencies are inferred from the claim text.

Electrically-operated roller door operating mechanism

Life of this patent

Electrically-operated roller door operating mechanism

Life of this patent

Abstract

Claims14