Positioning joint for a folding ladder

Details Positioning joint for a folding ladder Positioning joint for a folding ladder

1988-11-08

1990-01-02

Kundrat, Andrew V.

Joints and connections

Articulated members

Lockable at fixed position

182163, 16328, F16C 1100

Patent

active

048909505

ABSTRACT:
A positioning joint for a folding ladeer including a pair of first joint members each of which having an axial hole and a pair of locking holes, a second joint member having an axial hole and several pairs of positioning holes, a button mechanism having an axial shaft for combining a locking member and a coil spring being placed around the shaft, and a locking member having a pair of locking bars. The two joint members are relatively pivotable about a bushing passing through the axial holes thereof and are lockable in a series of predetermined angular positions by engaging the locking bars into the locking holes and positioning holes by means of the button mechanism and locking member.

REFERENCES:
patent: 4339844 (1982-07-01), Shatters
patent: 4403373 (1983-09-01), Kummerlin
patent: 4540306 (1985-09-01), Wang
patent: 4666327 (1987-05-01), Su et al.

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