Wheelwright machines – Rubber tire mounting and/or demounting apparatus – For collapsing or shifting tire axially
Patent
1985-04-09
1986-05-06
Smith, James G.
Wheelwright machines
Rubber tire mounting and/or demounting apparatus
For collapsing or shifting tire axially
B60C 2508
Patent
active
045865515
ABSTRACT:
A drive assembly for sequentially driving two or more fluid motors which are adapted to rotate the centerpost shaft of a tire changing machine includes a spool valve controller supplied with operating fluid from a four-way valve. The spool valve controller comprises a valve spool rotatable within a valve body having axially spaced sets of ports which are interconnected by flow passages formed in the exterior wall of the valve spool. The spool valve controller is operable to direct operating fluid from the four-way valve to selected ports in the valve body, which, in turn, are connected with lines to the fluid motors. The operation of the spool valve controller is timed to operate the fluid motors in sequence so as to produce a continuous high torque output of the centerpost shaft with no dead spots. Rotation of the centerpost in both the clockwise and counterclockwise directions is controlled by the four-way valve.
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Big Four Equipment, Inc.
Smith James G.
LandOfFree
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