Elevating and lowering apparatus

Details Elevating and lowering apparatus Elevating and lowering apparatus

1991-10-09

1992-12-08

Chin-Shue, Alvin C.

Fire escape, ladder, or scaffold

With storage device for supple escape

Reel

182 5, B66D 500

Patent

active

051689588

ABSTRACT:
The elevating and lowering apparatus comprises a baseplate (1) on which a freely rotatable lowering pulley (2) including a back-run safety is mounted. A toothed crown (7) is mounted on the side of the lowering pulley facing the baseplate, the teeth (7a) of the toothed crown cooperating with a ratchet member (9) in such a manner that in the freewheeling direction, the ratchet member is lifted, and in the reverse direction, the ratchet member blocks said toothed crown, i.e. the lowering pulley. Said ratchet member is accommodated in the baseplate. Such an additional back-run safety results in an increased security, and in some countries, it is mandatory for certain operations involving the apparatus.

REFERENCES:
patent: 334071 (1886-01-01), Clark
patent: 2220239 (1940-11-01), Haybeck
patent: 2990131 (1961-06-01), Carlsson
patent: 3759346 (1973-09-01), Brda
patent: 3946989 (1976-03-01), Tsuda
patent: 4367863 (1983-01-01), Dulondel et al.

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