Door latch for alarm system
OwnerWilliam Nginventor
Life of this patent
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Abstract
Door-lock hardware is constructed of corrosion-resistant material such as stainless steel. Such a material lacks magnetic properties to permit use in association with magnetic switches coupled to signal alarm and security systems. However, according to the preferred embodiment of the invention, a door latch of stainless steel or other non-magnetic material includes a ferrous-coated tongue portion to maintain compatibility with such monitors and alarms while providing a higher level of rust- and corrosion-resistance.
Claims10
A latch mechanism for a door having an edge portion proximate to a jam including a latch-bar receiving track, comprising:
- a guide mounted on the edge portion of the door;
- and
- a latch bar with a tongue portion disposed in the guide, the latch bar being slidingly moveable between an extended position, where the tongue portion is received by the latch-bar receiving track, and a retracted position, wherein the tongue portion is not received by the latch-bar receiving track, enabling the door to be opened;
- wherein latch bar is substantially composed of a non-ferrous material;
- and
- at least the tongue portion is coated with a ferrous material.
In a door of the type having an edge portion proximate to a jam including a latch-bar receiving track and a magnetic switch in electrical communication with an alarm security monitor, the improvement comprising:
- a non-ferrous latch bar having a tongue portion which is coated with a ferrous material for compatibility with the magnetic switch.
A latch system for door of the type used on a self-storage unit, comprising:
- a corrugated metal door having a opening edge portion;
- a jam adjacent the opening edge portion when the door is closed, the jam including a latch-bar receiving track;
- a magnetically operated switch disposed in the jam portion for sensing whether a ferrous latch bar has been received in the track;
- a guide mounted on the edge portion of the door;
- a non-ferrous latch bar having a tongue portion disposed in the guide, the latch bar being slidingly moveable between an extended position, where the tongue portion is received by the latch-bar receiving track, and a retracted position, wherein the tongue portion is not received by the latch-bar receiving track, enabling the door to be opened;
- and
- wherein at least the tongue portion is coated with a ferrous material for compatibility with the magnetically operated switch.
A method of improving a latch mechanism of the type having a magnetically operated switch used to sense an all-ferrous latch bar, comprising the steps of:
- removing the all-ferrous latch bar;
- and
- replacing it with a non-ferrous latch bar having a tongue portion coated with ferrous material to maintain operational compatibility with the magnetic switch.
A method of improving a latch mechanism of the type having a magnetically operated switch used to sense an all-ferrous latch bar, comprising the steps of:
- removing the all-ferrous latch bar;
- and
- replacing it with a stainless steel latch bar having a tongue portion coated with ferrous material to maintain operational compatibility with the magnetic switch.
Dependencies are inferred from the claim text.