Closure fasteners – Bolts – Swinging
Reexamination Certificate
1999-09-27
2001-10-16
Knight, Anthony (Department: 3626)
Closure fasteners
Bolts
Swinging
C292S201000, C070S275000
Reexamination Certificate
active
06302455
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electric safeguard door lock.
2. Description of the Related Art
A conventional electric lock adapted to be fit onto a door is used to unlock the door by pressing push buttons mounted on a panel connected to the electric lock, thereby allowing a user to open the lock without having to carry the lock keys at all times. However, the conventional electric lock has a complicated structure, thereby limiting the utility thereof. The present invention has arisen to mitigate and/or obviate the disadvantage of the conventional electric lock.
BRIEF SUMMARY OF THE INVENTION
In accordance with the present invention, an electric safeguard door lock includes a lock base having an elongated plate containing an elongated opening, two parallel side plates each attached to the elongated plate and each containing an arcuate slot, and an assembly space defined between the two side plates, a first pivot axle secured in the assembly space, a lock bolt pivotally mounted on the first pivot axle and having a first end detachably extending through the opening and a second end containing a slide slot, a push rod slidably received in the slide slot and having two ends each slidably received in the arcuate slot of a corresponding one of the two side plates, a second pivot axle secured in the assembly space, at least one pawl member pivotally mounted on the second pivot axle and having a first end formed with a first arm containing a notch detachably receiving the push rod, and a second end formed with a second arm containing an abutting recess having a periphery, a wheel rotatably received in the assembly space and including a worm gear mounted thereon, an actuating member secured on the wheel to rotate therewith and including two opposite drive stubs each detachably abutting the periphery of the abutting recess of the second arm of the pawl member, a speed reduction motor mounted in the assembly space, and a worm mounted on the speed reduction motor and meshing with the worm gear.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
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patent: 5148691 (1992-09-01), Walldén
patent: 5437173 (1995-08-01), Spinar
patent: 5452927 (1995-09-01), Uyeda
patent: 5474340 (1995-12-01), Brackmann et al.
patent: 5566991 (1996-10-01), Young
patent: 5722272 (1998-03-01), Bridgeman et al.
patent: 5825288 (1998-10-01), Wojdan
patent: 6089058 (2000-07-01), Elpern et al.
patent: 6109667 (2000-08-01), Collins
patent: 6112563 (2000-09-01), Ramos
Dellet and Walters
Knight Anthony
Rodgers Matthew E.
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