Mechanical gearing for roller blinds and awnings

Details Mechanical gearing for roller blinds and awnings Mechanical gearing for roller blinds and awnings

E - Fixed Constructions

06

B

160/1

E06B 9/26 (2006.01) E06B 9/76 (2006.01) E06B 9/88 (2006.01) E06B 9/80 (2006.01)

Patent

CA 1112148

ABSTRACT OF THE DISCLOSURE A transmission or mechanical gearing for roller blinds or gates, window shades and awnings or the like, with a self- locking worm gear drive in a two part housing on one end of a shaft and an abutment for limiting of the number of rotations of the shaft in the unwinding direction. The abutment comprises an abutment pinion having (n) teeth and meshing with the worm wheel, a locking disc having (n-1) teeth and similarly meshing with the worm wheel, the locking disc and the abutment pinion being mounted along a common axis, and an abutting pin. The abutting pin is mounted on the abutment pinion spaced from and with its longitudinal axis parallel to the common axis of the abutment pinion and the locking disc and is mounted to permit movement along its longitudinal axis. A slot is situated in the locking disc in a position to permit the abutting pin to move through it when relative movement of the abutment pinion and the locking disc results in the locking disc and the abutting pin being adjacent to one another. The abutting pin is adapted to move through the slot and engage the abutment to limit movement of the transmission at a predetermined position.

315030

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