Anti-spin handle for pump jack

Details Anti-spin handle for pump jack Anti-spin handle for pump jack

1988-10-25

1990-07-24

Chin-Shue, Alvin C.

Fire escape, ladder, or scaffold

Pole or strand grasping-type climber

Alternate grasping

248243, 254106, A63B 2700

Patent

active

049429418

ABSTRACT:
A pump jack for traveling up and down a pole includes a frame member and upper and lower shackles supported on the frame member. A pump arm is coupled to the pump jack and is operated for alternatively gripping the pole by the upper and lower shackles. The upper shackle has a helical rod which is cranked by a handle to roll along the surface of the pole. To prevent an accidental rolling of the helical rod and thus slipping of the pump jack down the pole, and anti-spin friction device including a rubber disc and a bolt acting thereon, is provided on the end of the helical rod opposite to that which carries the handle.

REFERENCES:
patent: 297126 (1884-04-01), Freeman
patent: 612673 (1898-10-01), Reidy et al.
patent: 728208 (1903-05-01), Dampfr
patent: 876004 (1908-01-01), Liberty
patent: 4463828 (1984-08-01), Anderson

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