| 摘要 |
A pneumatically actuated telescoping mast assembly has a mast axis and comprises a plurality of telescopically interengaged mast tubes having axially opposite ends and being axially slidable relative to one another along the mast axis between retracted and extended positions. Axially adjacent mast tubes include a stop collar held on one of the ends of each tube by a snap ring. The radially inner mast tube, of two adjacent mast tubes, includes a double wrap snap ring thereon for engaging the stop collar on the radially outer mast tube to limit relative axial displacement therebetween. The radially inner mast tube further includes a guide collar with a gasket slidably engaging the inner side of the radially outer mast tube. The mast assembly also includes an internal support collar for displacing and supporting the internal wiring used to supply power to the top of the mast assembly.
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