Hydraulic spike puller with frictionally delayed moving jaws and

Details Hydraulic spike puller with frictionally delayed moving jaws and Hydraulic spike puller with frictionally delayed moving jaws and

1999-06-22

2000-09-05

Scherbel, David A.

Implements or apparatus for applying pushing or pulling force

Nail extractor type

254 22, 254 24, B25C 1100

Patent

active

061130737

ABSTRACT:
A hydraulic spike puller comprising a frame with a chute, a hydraulic drive section connected to the frame, and a spike contacting section connected to the hydraulic drive section and movably located in the chute. The improvement comprises the spike contacting section comprising two jaws pivotably connected to each other and a friction system extending from the jaws and contacting opposite interior sides of the chute. The jaws each have a spike contacting claw section which, when the jaws are in an open position, have a back surface adjacent an interior side of the chute to block an area between the chute and the back surface. The claw sections have substantially non-curved bottom faces which, when the jaws are in the open position, can push a spike out of the chute. The claw sections are shaped to prevent a spike from being caught between the chute and the back surfaces of the claw sections.

REFERENCES:
patent: 925557 (1909-06-01), Bramstadt
patent: 3643918 (1972-02-01), Ellis
patent: 3746306 (1973-07-01), Ellis et al.
patent: 5253844 (1993-10-01), Cotic et al.
patent: 5524868 (1996-06-01), Decker et al.
patent: 5924679 (1999-07-01), Wilson
1. Advertisement--SP45 Spike Puller, Stanley, Nov. 1992, 1 page.
2. Advertisement--Hydraulic Spike Puller, Racine Hydraulic Tolling, Cat # HSP-1 1998, 1 page.
3. SP45 Spike Puller, Safety, Operation and Maintenance Manual; Stanley; 1992, 19 pages.
4. PCN Publication Change Notice, SP45 Operation & Maintenance Manual, 1995 Stanley, 7 pages.

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