Ladder joint with engagement spring member

Details Ladder joint with engagement spring member Ladder joint with engagement spring member

1990-06-25

1991-06-11

Seidel, Richard K.

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

Hinge

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

16332, 16334, 16349, 182163, 403 93, 403 96, E05D 1110

Patent

active

050221183

ABSTRACT:
A ladder joint with an engagement spring member on it for locking/unlocking the ladder joint into position. The ladder joint has a fixed member and a movable member. The movable member has a circular portion with fixing slots on its outer circumference. The fixed member has an annular track which slidably receives the circular portion of the movable member. Both the fixed and the movable members have a straight portion for connecting with the ladder pieces. The engagement spring member is a rounded flat spring which has an extended edge on one of its ends which normally spring loads the rectangular slug into one of the fixing slots as set by the user.

REFERENCES:
patent: 3643292 (1972-02-01), Mayer
patent: 4474264 (1984-10-01), Krause
patent: 4577986 (1986-03-01), Wang
patent: 4645371 (1987-02-01), Wang
patent: 4805737 (1989-02-01), Peng
patent: 4925329 (1990-05-01), Chuang

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