Fire escape – ladder – or scaffold – Pole or strand grasping-type climber – Alternate grasping
Patent
1994-08-22
1996-03-12
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Pole or strand grasping-type climber
Alternate grasping
182 92, 248246, A63B 2702
Patent
active
054978491
ABSTRACT:
A shiftable bracket which has a body portion essentially tubular in length but significantly higher than it is wide and considerably longer than it is wide which has a central locking plate assembly is disclosed. The central locking plate assembly, in turn, has a locking flange at its remote end and a centrally oriented bore for receiving a lock plate assembly pin. A pair of lock plates are employed which are essentially the mirror image each of the other, and which have locking flanges at the remote ends for being positioned inside of a mast. Because they are in a pair, one can be inserted inside the mast slot, then the other one inserted, and thereafter the body of the shiftable bracket moved into position in alignment with the bores in the lock plate assembly, and thereafter the lock plate assembly pin pass through the two side plate portions of the body and pivotally engage the lock plate assemblies in place. Thereafter, the lower portion of the locking flanges will engage the interior portion of the mast and jam-fittingly lock the same in place against dislodgement downwardly in the absence of the body being put into an end parallel relationship with the flanges.
REFERENCES:
patent: 3351313 (1967-11-01), Guillon
patent: 3968858 (1976-07-01), Vollan
patent: 4577726 (1986-03-01), Wheeler
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