Patent ID: 6113073
Filing Date: 2000-09-05
Classification: B25C,E01B

Abstract:
In a hydraulic spike puller comprising a frame, a hydraulic drive section connected to the frame, and a spike contacting section connected to the hydraulic drive section, the spike contacting section comprising two jaws pivotably connected to each other by a first pivot pin, the two jaws being separately connected to a drive rod of the hydraulic drive section by two links pivotably mounted to respective ones of the jaws, said links being pivotably connected to said drive rod through a second pivot pin, wherein a friction system extends through the first pivot pin, the friction system comprising two friction members biased by a spring in opposite directions against inside surfaces of the frame, wherein when the hydraulic drive initially moves the drive rod from one motion state to another motion state the two links both rotate and translate, and the two jaws merely initially rotate without translation, wherein the friction system further comprises two spacers located between the jaws and the frame, and wherein the spacers have a general ring shape with the friction members extending through center holes of the general ring shaped spacers.