Fire escape – ladder – or scaffold – Pole or strand grasping-type climber – Alternate grasping
Patent
1998-01-14
1999-11-02
Chin-Shue, Alvin
Fire escape, ladder, or scaffold
Pole or strand grasping-type climber
Alternate grasping
248243, A63B 2700
Patent
active
059752416
ABSTRACT:
A handle assembly is provided for a pump jack having a shackle assembly with a rotatable pole-gripping rod for engaging and rolling along a pole surface. The handle assembly includes an extension of the pole-gripping rod, a coil spring disposed on the rod extension, a sleeve disposed around the rod extension and coil spring, and a bar fixed to the sleeve. A crank arm extends transversely of the rod extension which is pivotally connected to the arm at a first pivot location. The bar is pivotally connected to the arm at a second pivot location. The coil spring urges the sleeve into engagement with a locking member on the shackle assembly, such that the sleeve is prevented from rotating and the rod is unable to roll along the surface of the pole. A handle is mounted on the free end of the crank arm. The coil spring is further operative to hold arm in a position in which rotation thereof is blocked by a frame member of the jack, whereby to further prevent the rod from rotating and rolling along the surface of the pole.
REFERENCES:
patent: 4463828 (1984-08-01), Anderson
patent: 4597471 (1986-07-01), Anderson
patent: 4942941 (1990-07-01), Anderson
patent: 4955584 (1990-09-01), Anderson
Berish Robert P.
Ford Steven J.
Chin-Shue Alvin
Quality Steel Products, Inc.
LandOfFree
Pump jack handle assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pump jack handle assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pump jack handle assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2123340