E - Fixed Constructions – 06 – C
Patent
E - Fixed Constructions
06
C
228/8
E06C 1/383 (2006.01)
Patent
CA 1217171
IMPROVEMENT IN POSITIONING JOINT FOR FOLDING LADDERS ABSTRACT A joint having two joint members which are pivotable with respect to each other about a common axis is lockable in a series of predetermined angular positions by engaging a spring-biased pawl provided within one member in notches formed at the peripheral edge of the other member. In manually operating the joint, the forked release element and the handle pivotably connected with each other act as an operating lever in cooperation with the clawed, spring-loaded control means in controlling locking and unlocking of the joint. The claw like stop portion of the control means, when being pushed to one side within the slot having its length at least twice longer than the width of the notch by the release element in counter-clockwise direction, permits engagement of the pawl in the notches and, upon operation of the handle thereby dis- engaging the pawl from the notches, returns to rest position under its spring force in clockwise direction. In this position, the stop portion, by pressing against the back of the release element in blocking the pawl from falling back to the notches, effectively prevents engagement of the pawl in the notches to permit free pivoting of the joint. Reference is given here to applicant's prior U.S. application with Serial No. 532,096 , filing date September 14, 1983.
451234
Marks & Clerk
Wang Tzu-Meng
LandOfFree
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