| 摘要 |
<p>Apparatus for lifting and applying torque to an object is disclosed. The apparatus comprises a releasable spring counterbalance which resiliently connects a drive for engaging applying torque to the object to a means for lifting an object, such as a crane. Preferably, a body portion connects the drive and a means for supporting the object. A spring counterbalance reduces the force due to the weight of the object which bears upon the threads when the object is lifted into a position to be torqued. After the threads are initially engaged, the counterbalance is removed and torque applied to the drive means. Torque is transferred through the body portion to the object. Thus, problems associated with the handling of large parts and initially engaging threaded connections are substantially reduced, since the initial engagement takes place under conditions of reduced force. The apparatus of the present invention creates a "soft" or "floating" connection between the material handling apparatus and the part being assembled. In a preferred embodiment, apparatus for installing a throttle valve bushing in a throttle valve bonnet is disclosed. Methods of assembling machine parts are also disclosed.</p> |
