High torque hydraulic shoe bolt wrench
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United States of America Patent
Stats
-
Apr 9, 1991
Issued Date -
N/A
app pub date -
Dec 18, 1989
filing date -
Sep 28, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic shoe bolt wrench used to mount and remove shoe bolts which secure shoes to a track chain. The apparatus comprises a vertical cylinder stood upright on a frame moving on a work table, a main frame secured to a piston rod of the vertical cylinder, a wrench socket driving shaft vertically projected below the main frame, a low speed high torque motor and a reduction gear provided on the driving shaft. Pressure oil is supplied to the high speed low torque motor and high pressure oil is supplied to the low speed high torque motor. Switching of the high speed low torque motor to the low speed high torque motor is carried out by a pressure switch disposed in a low pressure hydraulic circuit.
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