| 摘要 |
In a crane having an upper works rotatably supported on a lower works by an anti-friction bearing, a quick removal assembly structure includes an upper mounting ring affixed to the lowermost portion of the upper works and having teeth extending radially outwardly from the axis of the ring, a lower mounting ring mounted to the uppermost portion of the lower works and having teeth extending axially outwardly along a circle concentric with the center of that ring. The teeth of the upper and lower mounting rings fit snugly together when the upper works is assembled to the lower works, and radially outwardly opening horizontal slots in each tooth combine to define a horizontal retaining ring groove which is concentric with the rings. A retaining ring constituted as four retaining ring segments is of configuration to fit into the retaining ring groove, and when so fitted, prevents relative movement between the upper and lower mounting rings. Each end of each retaining ring segment integrally supports an end bracket, and a nut and bolt assembly is supported in each pair of adjacent end brackets. Shortening the effective length of each nut and bolt assembly causes the end brackets to move towards each other and firmly into the horizontal retaining ring groove. Retaining ring segment release means includes removable bolts threadably and horizontally mounted through provided openings in each of the retaining ring segments. Rotation of these bolts in inward direction forces the retaining ring segments out of the retaining ring groove. Retaining ring support arms extend outwardly from the teeth of one of the mounting rings to support the retaining ring segments when they are out of the retaining ring groove.
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