Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1987-08-12
1989-09-26
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
B66F 300
Patent
active
048694657
ABSTRACT:
A spreader tool comprises a housing including a fluid cylinder, a pair of arms pivotably mounted at one end to the housing and formed with jaws at the opposite end, a piston in the fluid chamber and including a stem carrying a piston head displaceable axially between the arms, and a spring urging the pair of arms toward each other to close the jaws. One of the arms includes a rib extending along its longitudinal axis, and the other arm includes two ribs extending laterally on opposite sides of its longitudinal axis and defining a space for nesting parts of the ribs in the two arms in the fully closed position of the jaws. The ribs define track surfaces engageable by the piston head during its axial displacement between the arms for spreading apart the jaws. The piston head is of cylindrical configuration and is mounted to the piston stem so as to be rotatable about the longitudinal axis of the piston stem, thereby permitting the piston head to accommodate any uneveness in the track surfaces of the ribs.
REFERENCES:
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patent: 4333330 (1982-06-01), Porter
Yirmiyahu Benyamin
Yirmiyahu Mordechai
Barish Benjamin J.
Watson Robert C.
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