Lockable hinge joint for folding ladders

Details Lockable hinge joint for folding ladders Lockable hinge joint for folding ladders

1991-07-02

1992-09-01

Spruill, Robert L.

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Hinge

Including means to hold or retard hinged members against...

16324, E05D 1110

Patent

active

051427397

ABSTRACT:
A joint has two inner and two outer shell halves which are mutually rotatably connected together by a central pivot bolt. A ring plate is coaxially rotatably inserted in a space formed between the inner shell half and the outer shell half of one side of the joint. The ring plate has an extended end on one side thereof with a stop, and is provided with a tensioning spring. Between the two outer shell halves in two rectangular slots is accommodated a locking pawl capable of radially moving into and out of the position notches defined on the curved peripheral edge of a disk portion formed by the two inner halves. The locking pawl can be pushed out of the position notch by a pull handle pivotally connected between the two shell halves, and the stop of the ring plate is able to be moved into the gap between the locking pawl and the notch by return tensioning spring force to prevent the locking pawl from entering into the position notch.

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