US3636484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Springless switch constructions for use in the protective circuit of burglar alarm systems
Assignee: Individual
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Filing: 1970-12-07
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Granted: 1972-01-18
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Expires: 1990-12-07
Abstract
Abstract A conductive permanent magnet structure fixed on the frame of a protected opening, attracts into contact with itself, a conductive loosely slidable armature having limited movement on the closure member; such magnet and slide constituting a switch protecting the opening. In closed condition of the switch, these switch parts are contiguous portions of the current path in the protective circuit. In installations where slide movement during the attraction is vertical, gravity returns the slide to a rest position, to be ready for a reestablishment of the protective circuit. When such direction is horizontal, the slide is automatically cammed to be in proper position if necessary, for the protective circuit to be put into operative condition. These switches avoid the need of cords across a parting of the frame and its closure. Stocking a few parts, affords the fabrication of switches of different constructions, either in the shop or on the job, to meet installation requirements and conditions.
Inventors
- 👤 Lawrence N Lea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:01
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/04; H; H01; H01H; H01H5/00; H01H5/02; H01H1/00; H01H1/50; H01H1/54; H01H2001/545; H01H36/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
161 words
In a springless switch device interposed in a conductor included in the circuit of an electrical burglar alarm system protecting a frame member having a movable closure member; said switch comprising two conductive parts one of which is a permanent magnet structure and the other of which is an armature for said one part; one of said switch parts being fixedly mountable on one of said members and means for loosely slidably mounting the other switch part on the other of said members and said other switch part being shiftable into contact with the first switch part when the closure member is in a closed position, such that said switch parts remain in contact by action of magnetic attraction of one of said parts for the other of said parts; said switch parts being separated upon the closure member assuming an open position; said switch parts when in contact being formable of contiguous portions of the current path through said conductor.
Claim 2
Dependent Claim
161 words
In a springless switch device interposed in a conductor included in the circuit of an electrical burglar alarm system protecting a frame member having a movable closure member; said switch comprising two conductive parts one of which is a permanent magnet structure and the other of which is an armature for said one part; one of said switch parts being fixedly mountable on one of said members and means for loosely slidably mounting the other switch part on the other of said members and said other switch part being shiftable into contact with the first switch part when the closure member is in a closed position, such that said switch parts remain in contact by action of magnetic attraction of one of said parts for the other of said parts; said switch parts being separated upon the closure member assuming an open position; said switch parts when in contact being formable of contiguous portions of the current path through said conductor.
Claim 3
Dependent Claim
151 words
A switch device as defined in claim 1, including stops associated with that member the slidable switch part is on, and with said slidable switch part, determining the scope of movement of said slidable part on the member it is on; such part when at one such stop which is farthest from the fixed switch part when the closure member is in closing position, holding said slidable switch part at a position that it will be attracted by the magnetic action into contact with the fixed switch part, when the closure member assumes closed position; the other stop allowing the slidable switch part a greater distance of travel towards the fixed switch part than is necessary for it to reach the fixed switch part when the closure member assumes closed position whereby on movement into contact with the fixed switch part, the movable switch part will meet it with an impact.
Claim 4
Dependent Claim
28 words
A switch device as defined in claim 2, wherein the magnet is fixed on the frame member, and the armature is loosely slidably mounted on the closure member.
Claim 5
Dependent Claim
120 words
A switch device as defined in claim 3, including a dielectric backing positioned fixed on the closure member and carrying the slide switch part; said backing being between the slide and closure member; said slide having an elongated slot along the direction it need move, a boss of insulative material extending fixed from said backing and into said slot to serve as a track for said slide; said boss being shorter than the length of said slot a distance equal to the scope of movement of the slide, and means attached to the longitudinal exposed face of the boss, overlapping the longitudinal edges of said slot, to maintain the assembly; the slide being loose for free movement on said backing.
Claim 6
Dependent Claim
84 words
A switch device as defined in claim 1, wherein the line of movement of the closure member is along the vertical, and the line of movement of the slide switch part on the closure member is also along the vertical; the direction of movement of the closure member to closing position being the same as the direction of movement of the slide switch part on the closure member when it moves into contact with the other switch part by the action of magnetic attraction.
Claim 7
Dependent Claim
145 words
A switch device as defined in claim 1, wherein the line of movement of the closure member is along the veRtical and the line of movement of the slide switch part is along the horizontal; the slide switch part being on the closure member, and including a cam element extending from the slide switch part to that edge of the fixed switch part that the movable slide switch part approaches when the closure member is moving from fully open position to fully closed position, whereby when the slide switch part is accidentally in position so that its cam is intercepted by said edge when the closure member is moving from open to closed position, said cam in cooperation with said edge will cause the slide switch part to shift and clear the fixed switch part thereby allowing the closure member to proceed to closed position.
Claim 8
Dependent Claim
71 words
A switch device as defined in claim 6, including a dielectric backing on the frame and carrying the fixed switch part, an insulative tab on said backing presenting the first edge the cam would meet when the closure member is moving to fully closed position; said edge of the tab cooperating with the cam for moving the slide switch member to allow the closure member to proceed to fully closed position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |