Closure fasteners – Magnetic
Reexamination Certificate
1999-08-11
2001-07-17
Estremsky, Gary W. (Department: 3627)
Closure fasteners
Magnetic
C292S341160
Reexamination Certificate
active
06260892
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a door lock, and more particularly to an electromagnetic door lock having a guiding mechanism.
2. Description of the Prior Art
Two typical electromagnetic door locks are disclosed in U.S. Pat. No. 5,016,929 to Frolov and U.S. Pat. No. 5,184,856 to Waltz and comprise an armature plate to be attracted by an electromagnet and to lock the door panels to the door frames. The armature plate normally is to be attracted to the electromagnet for securing the door panel to the door frame. However, after use, the hinge device for pivotally securing the door panel to the door frame may become loose, or the door panel may be tilted relative to the door frame, such that the armature plate may not be precisely aligned with and engaged into the electromagnet recess and such that the door panel may not be locked by the electromagnetic door lock. The electromagnetic door lock may thus be discarded and be replaced with a new one. For saving money, some people may adjust the armature plate relative to the electromagnet, and vice versa, for allowing the armature plate to be attracted to the electromagnet.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional electromagnetic door locks.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide an electromagnetic door lock including a guiding mechanism for guiding the armature plate to be aligned with the electromagnet and to be precisely attracted by the electromagnet.
In accordance with one aspect of the invention, there is provided an electromagnetic door lock comprising an electromagnet for securing to a frame, the electromagnet including at least one projection extended therefrom, a housing for securing to a door panel, an armature plate slidably received in the housing, the armature plate including at least one orifice formed therein for receiving the projection of the electromagnet and for preventing a shearing movement between the electromagnet and the armature plate when the armature plate is attracted toward the electromagnet, and means for guiding the projection of the electromagnet to be aligned with the orifice of the armature plate.
The guiding means includes at least one groove formed in the armature plate and communicating with the orifice of the armature plate for guiding the projection of the electromagnet to be aligned with the orifice of the armature plate. The orifice of the armature plate includes a depth greater than that of the groove of the armature plate for solidly receiving the projection of the electromagnet. The guiding means further includes at least one tapered surface formed in the armature plate and communicating with the groove of the armature plate for guiding the projection of the electromagnet to engage with the groove of the armature plate.
A device is further provided for guiding the armature to slide in the housing and includes at least one guide secured to the housing and having a head, the armature includes at least one opening formed therein for slidably receiving the head of the guide and for guiding the armature plate to slide in the housing. The armature plate includes an annular flange extended inward of the opening of the armature plate for engaging with the guide and for preventing the guide from being disengaged from the armature plate. A board is secured to the armature plate for engaging with the guide and for preventing the guide from being disengaged from the armature plate. A spring is further provided for biasing the armature plate toward the electromagnet.
Further objectives and advantages of the present invention will become apparent from a careful reading of a detailed description provided hereinbelow, with appropriate reference to accompanying drawings.
REFERENCES:
patent: 4487439 (1984-12-01), McFadden
patent: 4957316 (1990-09-01), Frolov
patent: 5016929 (1991-05-01), Frolov
patent: 5184856 (1993-02-01), Waltz
patent: 6007119 (1999-12-01), Roth
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