Lock for sliding door, window or like closure

Details Lock for sliding door, window or like closure Lock for sliding door, window or like closure

1998-04-03

2001-06-19

Barrett, Suzanne Dino (Department: 3627)

Locks

Special application

For closures

C070S095000, C070S097000, C070S090000, C292SDIG004

Reexamination Certificate

active

06247341

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a lock for sliding door, window or like closures.
2. Description of the Prior Art
FR-A-2 590 309 discloses a lock for a sliding door, window or like closure comprising, inside a casing, a slider mobile in the longitudinal direction of the casing and carrying a bolt-carrier, means for immobilizing the slider relative to the casing in the locked position of said slider and means for releasing the slider from its locked position, the slider including maneuvering member means accessible through a longitudinal slot in the outside wall of the casing.
According to the above document, the slider is immobilized relative to the casing in the locked position of the slider by a ratchet having at least one projecting tooth and actuated by a maneuvering member fastened to the slider. To release the ratchet there is a “dead” travel of the slider before the bolt is entrained.
A ratchet device of the above kind is costly and complicated.
The aim of the present invention is to remedy the drawbacks of prior art locks and to propose a lock of the above type that is simple, economical and reliable.
SUMMARY OF THE INVENTION
In accordance with the present invention, in a lock of the above type the slider has on its face adjacent a covering plate of the casing a member projecting a predetermined distance relative to the adjacent face, the projecting member being adapted to project through the slot in the locked position of the slider and abut against an edge of the covering plate defining the longitudinal end of the slot that is at the rear in terms of the locking direction, and return spring means between the slider and the casing spring load the slider towards the covering plate of the casing but allow movement of the slider in a direction perpendicular to the covering plate over a distance at least equal to the predetermined distance.
Accordingly, when the slider, actuated by the maneuvering member, reaches its locked position the projecting member is in front of the slot in the casing and is made to enter this slot by the return spring means.
To release the slider it is sufficient to exert a slight force on the maneuvering member in the direction perpendicular to the covering plate of the casing to move the maneuvering member and the slider in this direction towards the inside of the casing a distance at least equal to the predetermined height of the projecting member. This releases the projecting member from the edge defining the corresponding end of the slot and the maneuvering member and the slider are then moved in the longitudinal direction of the casing to unlock the closure.
In an advantageous version of the invention the casing comprises an extrusion or like member having two substantially parallel lateral longitudinal walls projecting on the same side relative to the cover plate, each lateral longitudinal wall having on its respective longitudinal edge opposite the covering plate a respective longitudinal rim extending transversely towards the other lateral wall over at least part of the transverse dimension of the casing, and the slider has at least one lug adapted to bear elastically on at least one of the rims of the casing.
In a preferred version of the invention the slider includes means adapted to cooperate with complementary means of the casing to render the unlocked and locked positions of the slider precise stable positions by elastically opposing with a predetermined force any movement of the slider either way in the longitudinal direction from one or other of said stable positions, where applicable assisting movement of the slider to the opposite stable position on moving past an unstable middle position.
Other features and advantages of the invention will become apparent in the following detailed description given by way of non-limiting example only with reference to the appended drawings.


REFERENCES:
patent: 3050322 (1962-08-01), Miller
patent: 3390557 (1968-07-01), Erickson et al.
patent: 4024739 (1977-05-01), Kaufman
patent: 4428605 (1984-01-01), Follows
patent: 4436329 (1984-03-01), Metzger
patent: 4790157 (1988-12-01), Lin
patent: 5074133 (1991-12-01), Simoncelli
patent: 5511833 (1996-04-01), Tashman et al.
patent: 0 044 264 (1982-01-01), None
patent: 2 700 577 (1994-07-01), None
patent: 2 115 063 (1983-09-01), None

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