Patent US3748416A successfully refreshed from Google Patents.
US3748416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Window switch assemblies for burglar alarm
Assignee: Individual
•
Filing: 1972-03-09
•
Granted: 1973-07-24
•
Expires: 1992-03-09
Abstract
Abstract A switch assembly comprises an L-shaped insulative plastic casing mountable on the top of the frame of the lower window of double hung windows. First and second pairs of spring biased slidable contact elements are disposed respectively at opposite ends of the casing. Conductors in the casing connect the contact elements. On the casement enclosing the window is a first circuit member to which an external alarm circuit is connected. On the frame of the upper window is a second circuit element. Raising the lower window or lowering the upper window moves the contact elements with respect to the second circuit element to actuate the alarm circuit. Metallic loops can be provided on the windows connected respectively to the conductors and the first circuit member in a series circuit so that breaking either loop actuates the alarm circuit.
Inventors
- 👤 A Wechter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:18
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
170 words
A window switch assembly for operating a burglar alarm circuit, comprising a casing L-shaped in plan view and adapted for mounting on top of the window frame of the lower one of a pair of vertically slidable upper and lower framed double hung windows in a casement; a first circuit member on the frame of the upper one of the windows; a second circuit member on the casement; means for connecting said alarm circuit to said second circuit member; a first pair of spring biased slidable contact elements at one end of said casing disposed to contact the first circuit member; a second pair of spring biased slidable contact elements at the other end of the casing disposed to contact the second circuit member; and conductors in said casing connecting said first and second contact elements so that lowering the upper window or raising the lower window changes the relative position of said first pair of contact elements with respect to said first circuit member to actuate said alarm circuit.
Claim 2
Dependent Claim
170 words
A window switch assembly for operating a burglar alarm circuit, comprising a casing L-shaped in plan view and adapted for mounting on top of the window frame of the lower one of a pair of vertically slidable upper and lower framed double hung windows in a casement; a first circuit member on the frame of the upper one of the windows; a second circuit member on the casement; means for connecting said alarm circuit to said second circuit member; a first pair of spring biased slidable contact elements at one end of said casing disposed to contact the first circuit member; a second pair of spring biased slidable contact elements at the other end of the casing disposed to contact the second circuit member; and conductors in said casing connecting said first and second contact elements so that lowering the upper window or raising the lower window changes the relative position of said first pair of contact elements with respect to said first circuit member to actuate said alarm circuit.
Claim 3
Dependent Claim
70 words
A window switch assembly as defined in claim 1, wherein said first circuit element is a conductive member electrically bridging the first pair of spring biased contact elements when the upper window is raised and closed to define a series circuit between the contact elements of said second pair thereof, so that lowering the upper window or raising the lower window opens said series circuit to actuate said alarm circuit.
Claim 4
Dependent Claim
79 words
A window switch assembly as defined in claim 1, wherein said first circuit element is a conductive member noRmally disposed out of contact with said first pair of spring biased contact elements when the upper window is raised and closed, whereby lowering the upper window or raising the lower window bridges the conductive member across the first pair of contacts to complete a series circuit between the contact elements of said second pair thereof for actuating said alarm circuit.
Claim 5
Dependent Claim
64 words
A window switch assembly as defined in claim 1, wherein said first circuit member comprises a pair of spaced conductive elements; and further comprising a metallic loop on the upper window connected to said spaced conductive elements in a series circuit with the contact elements of said second pair thereof, whereby breaking said metallic loop breaks said series circuit to actuate said alarm circuit.
Claim 6
Dependent Claim
49 words
A window switch assembly as defined in claim 4, further comprising another metallic loop on the lower window connected in series with said conductors, said conductive elements, the first named metallic loop, and said second pair of contact elements, whereby breaking said other metallic loop actuates said alarm circuit.
Claim 7
Dependent Claim
52 words
A window switch assembly as defined in claim 1, wherein each one of said contact elements comprises means defining a chamber, a coil spring in the chamber, and a metallic ball at one end of the chamber, said spring bearing on said ball urging it outwardly of an end of said casing.
Claim 8
Dependent Claim
55 words
A window switch assembly as defined in claim 1, wherein each one of said contact elements comprises means defining a chamber, a coil spring in the chamber, and an axially slidable cylindrical pin at one end of the chamber, said spring bearing on said pin and urging it outwardly at an end of said casing.
Claim 9
Dependent Claim
29 words
A window switch assembly as defined in claim 1, wherein said casing is composed of insulative plastic material to prevent short circuiting the contact elements at opposite ends thereof.
Claim 10
Dependent Claim
43 words
A window switch assembly as defined in claim 1, further comprising a metallic loop on the lower window connected to said conductors in the casing in a series circuit, so that breaking said loop breaks said series circuit to actuate said alarm circuit.
Claim 11
Dependent Claim
49 words
A window switch assembly as defined in claim 9, further comprising another metallic loop on the upper window connected to said first circuit member in said series circuit with the first named loop, so that breaking said other metallic loop breaks said series circuit to actuate said alarm circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |