Importance

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Abstract

A telescoping multi-sectional mast in which the upper sections are extended and retracted in a controlled predetermined sequence and in which each section, when fully extended, is automatically and positively locked to the next lower section. The improved locking system includes a lock projection-lock engagement pair, one of the pair being carried on the outer surface of each of the upper sections of the mast and the other of the pair being carried on the upper ends of each of the intermediate sections. A lock actuator stud is carried on the upper end of each of the intermediate and bottom sections. This pair cooperates to operatively lock together in response to disengagement with the actuator stud carried on the next lower mast section, to restrain relative vertical movement between an upper section which is fully extended from the next lower section. The pair unlocks in response to engagement with the actuator stud carried by the next lower section. An improved drive nut for an axial drive screw used in extending and retracting mast sections is located by a spring-loaded spline-seat within a nut housing, to absorb initial shock loads when initially engaged with the drive screw. A cable tensioner/dispensing/stowage device provides an improved means for handling cables extending from ground level to equipment located on the top of the telescoping mast.

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First Claim