Positioning joint for folding ladders

Details Positioning joint for folding ladders Positioning joint for folding ladders

1987-07-15

1989-04-25

Kundrat, Andrew V.

Joints and connections

Articulated members

Lockable at fixed position

403 96, 403 61, 182163, 16332, F16C 1100, E06C 750

Patent

active

048242780

ABSTRACT:
A positioning joint for a folding ladder comprising a first joint member, a second joint member, an operating lever pivotably connected to the first joint member and U-shaped members acting as a control means. The U-shaped member has a sustaining portion and two bolt receiving portions each with a central bore which is embodied in the shape of an ellipse. The joint members, lever and U-shaped member are pivotably interconnected permitting engagement and disengagement of spring and pawl units with the U-shaped member for thereby locking and unlocking the joint.

REFERENCES:
patent: 2502641 (1950-04-01), Consor
patent: 3955240 (1976-05-01), Schuh et al.
patent: 4474264 (1984-10-01), Krause
patent: 4540306 (1985-09-01), Wang
patent: 4543006 (1985-09-01), Wang
patent: 4611945 (1986-09-01), Diego
patent: 4645371 (1987-02-01), Wang
patent: 4770559 (1988-09-01), Yoo

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