Pump jack pole

Details Pump jack pole Pump jack pole

1990-08-01

1991-08-27

Chin-Shue, Alvin C.

Fire escape, ladder, or scaffold

Pole or strand grasping-type climber

Alternate grasping

248246, 403381, E04G 120

Patent

active

050426150

ABSTRACT:
A pump jack pole is comprised of an elongated metal tube of rectangular configuration and a resiliently yieldable elastomeric strip which is secured to one side of the tubing. The tubing is comprised of an aluminum extrustion whereon there is formed a plurality of longitudinally extending closely-spaced plarallel protrusions. The strip is formed with a plurality of similarly spaced longitudinally extending grooves of complementary configuration to the protrusions which are interdigitated with the grooves.

REFERENCES:
patent: 3422584 (1969-01-01), Howard
patent: 3572799 (1971-03-01), Truesdell
patent: 3777438 (1973-12-01), Brown
patent: 4382488 (1983-05-01), Anderson
patent: 4685368 (1987-08-01), Gardner
patent: 4727695 (1988-03-01), Kemeny

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