Bistable member for ejecting snap fastener and spring latch asse

Details Bistable member for ejecting snap fastener and spring latch asse Bistable member for ejecting snap fastener and spring latch asse

1998-03-18

1999-02-16

Sakran, Victor N.

Buckles, buttons, clasps, etc.

Separable-fastener or required component thereof

Including member having distinct formations and mating...

24102A, 24108, 24464, 24681, 411353, A44B 1700

Patent

active

058708065

ABSTRACT:
A bistable member including a bistable, invertable dish- or dome-shaped base portion and an engaging projection extending therefrom. A male member is engaged with the bistable member by pressing the male member against a central apex of the bistable member that is surrounded by the engaging projection, thereby inverting the bistable member from a first stable form to a second stable form. In the second stable form, the engaging protrusion and a portion of the bistable member wrap around a knob of the male member, thereby securing the male member to the bistable member. A subsequently applied triggering energy re-inverts the bistable member, thereby releasing the male member. This assembly is usable as a snap fastener by setting an equilibrium point of the bistable member such that a relatively large triggering energy is required to re-invert the bistable member. The assembly is also usable as a spring latch to propel projectiles (or an ejecting snap fastener to force open doors) by setting an equilibrium point of the bistable member such that a relatively small triggering energy is required to re-invert the female member, thereby applying a relatively large ejecting force to the projectile/door.

REFERENCES:
patent: 2623311 (1952-12-01), Condon
patent: 2946612 (1960-07-01), Ahlgren
patent: 3036487 (1962-05-01), Hughes
patent: 3118718 (1964-01-01), Babey
patent: 4557654 (1985-12-01), Masuda et al.
patent: 4709949 (1987-12-01), Umezawa et al.
patent: 4751773 (1988-06-01), Nysten
patent: 4985968 (1991-01-01), Hooper
patent: 5113553 (1992-05-01), Hutchinson

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