Patent ID: 7497140
Filing Date: 2009-03-03
Classification: F16H,Y10T

Abstract:
1. A telescoping mast assembly, comprising: at least three elongate tubular sections, wherein a first, a second, and a third elongate tubular section each has an upper end and a lower end; wherein said second elongate tubular section is telescopically received by said first elongate tubular section; said third elongate tubular section is telescopically received by said second elongate tubular section; an axial drive screw centrally located in said mast assembly for extending and retracting said second and third elongate tubular sections; and, a nut carrier assembly secured to a bottom section of each of said second and third tubular sections, said nut carrier assemblies each comprises a threaded nut housed within a collar, said threaded nut engages corresponding threads on said drive screw; and a gear assembly for rotating said drive screw, said gear assembly housed within a gearbox housing; a braking mechanism comprising a locking cylinder and a locking plate mounted to said gearbox housing; and a cover plate mounted to said locking cylinder.