Elbow puller

Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator

Patent

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Details

29267, 29282, 29427, 254131, H01R 4300

Patent

active

039627705

ABSTRACT:
A simple, low-cost, high mechanical advantage pulling tool especially adapted for use in detaching electrical termination appliances such as transformer elbows is provided which ensures quick, safe, elbow separation with reduced probability of flashover through the use of an elbow-gripping tool and a juxtaposed, pivotally interconnected, lever-actuated pushrod which permits the user to smoothly detach a stuck-in-place elbow without unsafe abrupt jerking movements which can cause the user to lose his balance in dangerously close proximity to energized electrical equipment. The tool includes an elongated, insulative pole having elbow-gripping structure thereon with an adjacent lever-actuated pushrod pivotally linked thereto permitting relative axial shifting movement between the pushrod and elbow-gripping pole. In use, the gripping section of the tool is operatively positioned about a detachable elbow and the pushrod is placed against the adjacent stationary transformer tank wall; pivotal manipulation of the lever handle interconnecting the pushrod and elbow-gripping rod simultaneously creates a pushing force through the pushrod and against the tank wall, and a corresponding, multiplied, oppositely directed pulling force on the elbow-gripping pole in order to quickly and smoothly detach the elbow. In preferred forms, the tool includes adjustment structure permitting the pushrod to be circumferentially shifted about the elbow gripping pole as needed in order to facilitate placement of the pushrod in a noninterfering position on the transformer tank wall. The tool can either be manufactured as a separate unit, or be fabricated using a conventional hot line tool with appropriate modification including a pushrod and operating lever handle.

REFERENCES:
patent: 2457258 (1948-12-01), Mitchell
patent: 3600784 (1971-08-01), Prupst et al.
patent: 3606660 (1971-09-01), Davis

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