| 摘要 |
<p>A bolster for a press, such as a mechanical press, which is capable of being easily retracted downwardly so as to increase the die separation thereby enabling easy access to the dies for maintenance. The bolster assembly includes a base mounted to the bed of the press, a bolster supported on the base and guided thereby for rectilinear movement in opposed relation to the bed and slide between an extended position for normal press operation, and a retracted position wherein the separation between the upper and lower dies is sufficient to permit easy access, and a hydraulic piston and cylinder arrangement for rigidly holding the bolster in its extended position when charged with high pressure hydraulic fluid, yet permitting the bolster to retract when the hydraulic pressure is released. A clamping mechanism comprising a plurality of hydraulically actuated wedges clamps the bolster in its extended position against horizontal movement, and means are provided for ensuring that the bolster always returns to the same, accurately located position when it is extended.</p> |
