| 摘要 |
A hydraulic staging jack has a circumferentially grooved cylinder which fits into a base in which two shoes are seated and each shoe has two axially spaced flanges which engage in two axially spaced grooves of the cylinder. Radially outer surfaces of the shoes are axially angled so that moving the shoes axially out of the base causes the shoes to separate radially, thereby disengaging the flanges from the grooves and permitting adjustable axial fixing of the position of the cylinder relative to the base.
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