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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 t

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.

대표청구항 ▼

1. In a pneumatically actuated telescoping mast assembly having a mast axis and comprising 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, means for dis

1. In a pneumatically actuated telescoping mast assembly having a mast axis and comprising 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, means for displacing said mast tubes between said retracted and extended positions, and a wire coil for providing electrical power to a fixture on an end of said mast assembly, the improvement comprising:at least two axially adjacent ones of said telescoping mast tubes including a stop collar held on one of said ends of each tube by a snap ring. 2. The telescoping mast assembly of claim 1, wherein the radially inner one of the at least two tubes has a double wrap snap ring thereon between the one and the other of the opposite ends thereof for engaging the stop collar on the radially outer one of the at least two tubes to limit relative axial displacement therebetween. 3. The telescoping mast assembly of claim 2, and a guide collar on the other of said opposite ends of the radially inner tube and slidably engaging the inner side of said radially outer tube. 4. The telescoping mast assembly of claim 3, wherein each said guide collar includes a gasket on the radially outer side, said gasket slidably engaging the inner side of said radially outer tube. 5. The telescoping mast assembly of claim 3, wherein said wire coil has opposite ends and at least one of said telescoping mast sections includes means for supporting said wire coil between said opposite ends thereof for displacement with the one mast section. 6. In a pneumatically actuated telescoping mast assembly having a mast axis and comprising 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, means for displacing said mast tubes between said retracted and extended positions, and a wire coil for providing electrical power to a fixture on an end of said mast assembly, the improvement comprising:the radially outer one of at least two axially adjacent ones of said mast tubes including a stop collar, and a double wrap snap ring on the radially inner one of the axially adjacent tubes for engaging the stop collar to limit axial displacement therebetween. 7. The telescoping mast assembly of claim 6, and a guide collar on said radially inner one of said tubes slidably engaging the inner side of said radially outer tube. 8. The telescoping mast assembly of claim 7, wherein each said guide collar includes a gasket on the radially outer side, said gasket slidably engaging the inner side of said radially outer tube. 9. The telescoping mast assembly of claim 7, wherein said wire coil has opposite ends and at least one of said telescoping mast sections includes means for supporting said wire coil between said opposite ends thereof for displacement with the one mast section. 10. The telescoping mast assembly of claim 6, wherein said wire coil has opposite ends and at least one of said telescoping mast sections includes means for supporting said wire coil between said opposite ends thereof for displacement with the one mast section. 11. In a pneumatically actuated telescoping mast assembly having a mast axis and comprising 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, means for displacing said mast tubes between said retracted and extended positions, and a wire coil for providing electrical power to a fixture on an end of said mast assembly, the improvement comprising:a guide collar on one of said opposite ends of the radially inner one of said tubes slidably engaging the inner side of said radially outer andsaid wire coil has opposite ends and at least one telescoping intermediate mast tube includes means for lifting a portion of said wire coil between said opposite ends thereof for displacement with said at least one intermediate mast tube. 12. In a pneumatically actuated telescoping mast assembly having a mast axis and comprising 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, means for displacing said mast tubes between said refracted and extended positions, and a wire coil for providing electrical power to a fixture on an end of said mast assembly, the improvement comprising:a guide collar on one of said opposite ends of the radially inner one of said tubes slidably engaging the inner side of said radially outer tube; and,at least two axially adjacent ones of said telescoping mast tubes include a stop collar held on the other of said ends of each tube by a snap ring. 13. The telescoping mast assembly of claim 12, wherein the radially inner one of the at least two tubes has a double wrap snap ring thereon between the one and the other of the opposite ends thereof for engaging the stop collar on the radially outer one of the at least two tubes to limit relative axial displacement therebetween. 14. The telescoping mast assembly of claim 12, wherein said wire coil has opposite ends and at least one of said telescoping mast sections includes means for supporting said wire coil between said opposite ends thereof for displacement with the one mast section. 15. In a pneumatically actuated telescoping mast assembly having a mast axis and comprising 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, means for displacing said mast tubes between said retracted and extended positions, and a wire coil for providing electrical power to a fixture on an end of said mast assembly, the improvement comprising:said wire coil having opposite ends and at least one telescoping intermediate mast section including means for lifting said wire coil between said opposite ends thereof for displacement with said one intermediate mast section. 16. In a pneumatically actuated telescoping mast assembly having a mast axis and comprising 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, means for displacing said mast tubes between said retracted and extended positions, and a wire coil for providing electrical power to a fixture on an end of said mast assembly, the improvement comprising:said wire coil having opposite ends and at least one of said telescoping mast sections including means for supporting said wire coil between said opposite ends thereof for displacement with the one mast sectionat least two axially adjacent ones of said telescoping mast tubes include a stop collar held on one of said ends of each tube by a snap ring. 17. The telescoping mast assembly of claim 16, wherein the radially inner one of the at least two tubes has a double wrap snap ring thereon between the one and the other of the opposite ends thereof for engaging the stop collar on the radially outer one of the at least two tubes to limit relative axial displacement therebetween. 18. The telescoping mast assembly of claim 17, and a guide collar on the other of said opposite ends of the radially inner tube and slidably engaging the inner side of said radially outer tube. 19. In a pneumatically actuated telescoping mast assembly having a mast axis and comprising a plurality of telescopically interengaged mast tubes having axially opposite ends and being axially slidable relative to one another along the mast axis between refracted and extended positions, means for displacing said mast tubes between said refracted and extended positions, and a wire coil for providing e lectrical power to a fixture on an end of said mast assembly, the improvement comprising:said wire coil having opposite ends within said telescoping mast sections and at least one of said telescoping mast sections including a support collar for lifting a portion of said wire coil between said opposite ends thereof for displacement with the one mast section.