Fire escape – ladder – or scaffold – Pole or strand grasping-type climber – Alternate grasping
Patent
1997-09-29
1998-11-10
Chin-Shue, Alvin
Fire escape, ladder, or scaffold
Pole or strand grasping-type climber
Alternate grasping
E04G 120
Patent
active
058330291
ABSTRACT:
A pump jack pole assembly includes a rigid elongated tubular member having a planar front wall surface, an elongated elastomeric strip having a flat rear surface disposed adjacent the tubular member front wall surface and a front surface having grooves therein extending lengthwise of the strip, a retainer plate in each of the grooves, each of the plates having a thickness less than the depth said grooves so that the front surfaces of the plates are recessed in the strip front surface, and screws for releasably fixing the plates in the grooves and the elastomeric strip to the tubular member front wall, the heads of the screws being recessed in the plates.
REFERENCES:
patent: 550175 (1895-11-01), Holden
patent: 1476509 (1923-12-01), Hart
patent: 1714044 (1929-05-01), Pedersen
patent: 2240682 (1941-05-01), Weinstein
patent: 2263063 (1941-11-01), Allen
patent: 4028856 (1977-06-01), Dalbec
patent: 4223507 (1980-09-01), Mascaro
patent: 4382488 (1983-05-01), Anderson
patent: 5042615 (1991-08-01), Anderson
Chin-Shue Alvin
Quality Steel Products, Inc.
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