Hydrodynamic swing damper and tree handling vehicle incorporatin

Details Hydrodynamic swing damper and tree handling vehicle incorporatin Hydrodynamic swing damper and tree handling vehicle incorporatin

1989-08-04

1991-06-25

Spar, Robert J.

Material or article handling

Vertically swinging load support

Grab

188282, 188299, B66C 1100

Patent

active

050262483

ABSTRACT:
A swing damper and a swing damper in one or more pivot joints, suspending a work tool such as a grapple from a boom. The swing damper is a hydraulic pivot joint where pivoting at the joint causes movement of a piston, in a closed chamber, that separates the chamber into first and second inter-related variable volume chamber portions. Upon movement of the piston, fluid is forced through a restricted opening from one chamber portion to the other with the amount of restriction determining the degree of damping. The piston is moved linearly in the chamber by a motion translating means operatively interconnecting the pivot shaft and piston. The motion translating means preferably is a screw thread on the shaft mating with a threaded aperture in the piston. Rods pass through the piston preventing it from rotating in the chamber.

REFERENCES:
patent: 4493659 (1985-01-01), Iwashita
patent: 4524851 (1985-06-01), Sawano et al.
patent: 4553778 (1985-11-01), Tyer
patent: 4846317 (1989-07-01), Hudgens

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