Safety device

Details Safety device Safety device

B - Operations, Transporting

66

B

187/9

B66B 11/04 (2006.01)

Patent

CA 1219532

CMA 124382 ABSTRACT OF THE DISCLOSURE A drive pinion disengaging device for use in rack and pinion hoists includes an outer section of rack having toothed portions above and below, an at least potentially toothless portion, and a bridging rack section adapted to be removed at said toothless portion by said drive pinion when under a predetermined load to permit the latter to disengage the rack in case of malfunction. This permits the large rotational inertia to be dissipated without injury to the drive mechanism. The point of disengagement is such as to occur preferably only when the hoist is engaged by the safety landing buffers (since the drive pinion is normally the only effective support for the hoist). The bridging section rack may be in the form of a sliding rack maintained in a longitudinal slot in the main rack (extending across the toothless portion and slightly up into the toothed portion above) and normally secured in place across an actually toothless portion by a shear pin, detent, and the like; or may be a rack having shearable teeth (preferrably thinner than the main rack, or optionally of a softer material).

461419

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