Portable and collapsible derrick structure

Details Portable and collapsible derrick structure Portable and collapsible derrick structure

1985-04-15

1987-03-24

Blix, Trygve M.

Traversing hoists

Having means facilitating assembly or disassembly

Of traversing hoist from support

212186, 52116, 52120, B66C 2342

Patent

active

046518843

ABSTRACT:
A pickup truck derrick assembly includes a base frame, a derrick A-frame pivotally mounted on the base frame, a derrick frame erection subassembly, a frame support and locking subassembly and a cable compensation system. In one form, the frame erection subassembly includes an elongated track. A roller or carriage subassembly rides on the track and engages the A-frame. Movement of the carriage along the track raises and lowers the A-frame. The A-frame is held in an erected position by support braces pivotally connected at one end to the base frame. Each brace slidably engages a sleeve mounted on the A-frame. A locking mechanism automatically secures the braces to the sleeves when the A-frame is erected. In another form, the erection subassembly includes lead screw actuators combined with the support braces to raise and lower the A-frame and lock the frame in position. A pulley and cable arrangement including a compensation pulley on a support arm fixed to the A-frame compensates for hoist cable slackening when the A-frame is pivoted to its storage position.

REFERENCES:
patent: 2259966 (1941-10-01), Tappe
patent: 2583958 (1952-01-01), Moon

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