Positioning joint for folding ladders

Details Positioning joint for folding ladders Positioning joint for folding ladders

1986-08-07

1987-05-19

Husar, Cornelius J.

Joints and connections

Articulated members

Lockable at fixed position

403 93, 16329, 16344, 182 23, 182163, E05D 1110

Patent

active

046663282

ABSTRACT:
A positioning joint for a folding ladder comprising a first joint member, a second joint member disposed between the first joint member, and a hollow shaft inserted into central holes of the first and second joint members. The joint further includes a turning plate disposed on an inner wall of a first disc portion of the first joint member, a crank-shaped strip, and a spring mounted around the hollow shaft. A push knob is inserted into the hollow shaft, and a pin is inserted into a pair of axially elongated holes in the hollow shaft and into a pin hole in the push knob. The crank-shaped strip has a pair of small projections adapted to be inserted into engaging holes of the first and second joint members as well as a pair of large projections adapted to be inserted into the first and second joint members and the turning plate. The crank-shaped strip also has a central portion fixed between the hollow shaft and the spring.

REFERENCES:
patent: 4152810 (1979-05-01), Martinez
patent: 4216844 (1980-08-01), Klafs
patent: 4377020 (1983-03-01), Vigo
patent: 4407045 (1983-10-01), Boothe
patent: 4543007 (1985-09-01), Quiogue
patent: 4566150 (1986-01-01), Boothe

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