| 摘要 |
A concrete block tong assembly which is designed to lift and transport a plurality of concrete blocks. The assembly is provided with three top support members pivotally connected at one end thereof to one end of three bottom support members. A lifting apparatus is operatively connected to the top three support members whereupon upward movement of the top three support members by the lifting mechanism will cause the top support members to pivot with respect to the bottom support members. A front plate is secured to one end of each of the top support members for movement therewith and a back plate is longitudinally adjustably secured to each of the bottom support members adjacent the other end thereof. A solenoid operated locking bolt is selectively movably mounted within each of the top support members and has an actuator rod which is movable between extended and retracted positions. When the solenoids are activated, the locking bolts are retracted to their unlocked positions so that when the lifting device raises the assembly, the top support members pivot with respect to the bottom support members to urge the front plates and back plates of the assembly into frictional engagement with the ends of the concrete blocks. A manual override is provided for manually moving the locking bolts into their unlocked positions.
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