| 摘要 |
<p>Method and apparatus for eliminating the danger of inadvertent failure of a weight-bearing retraction system, such as a dryer hood retraction system. A load lifted using a fluid cylinder (20) can be easily locked in place against gravity by using a double rod ended cylinder (30), where the rod end (30') not exerting the force is permitted to move through a clearance hole while the load is being lifted, and is then blocked to prevent the return motion until the load is to be released.</p> |
