| 摘要 |
<p>The locking system for rigth angled frames can be used with a hydraulic press and employes four corner blocks, each consisting of an angle or L-shaped block forming the right angle, and a plate across one side formed integrally. This plate is triangular, fitted between the two arms, one forming a triangular locating recess. The four blocks are made of steel. The plate across the corner enables the four blocks to remain in the same level plane. The four blocks can be interconnected by four round rods, and operate against light return springs.</p> |
