US4604609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security system
Assignee: Individual
•
Filing: 1985-03-21
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Granted: 1986-08-05
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Expires: 2005-03-21
Abstract
Abstract A security arrangement for a closed door having an elongated member connected between the door and the wall and a tautly mounted string joining the door knob and an electrical switch on the wall, the string passing over the elongated member. When an attempt is made to open the door tension on the string is increased resulting in the switch being moved into its closed position thereby energizing an alarm device.
Inventors
- 👤 George H. Wakefield, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:06
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
In combination with a door having a knob mounted in the doorway of a wall, a security arrangement comprising an elongated, rigid member having a fixed loop at one end and a latched loop at the other end, first loop means mounted on said door adjacent the side of said door which swings open adapted to engage one of the loops of said elongated member, second loop means mounted on said wall adjacent said first loop means for engaging the other loop of said elongated member, so that when said door is closed said elongated member may be engaged with the loops mounted on said door and said wall, string means tied at one end to said door knob and stretched taut over said elongated member, and means for engagement with the other end of said string means for producing an alarm when the tension in said string means is increased due to an attempted opening of said door causing said elongated member to move.
Claim 2
Dependent Claim
165 words
In combination with a door having a knob mounted in the doorway of a wall, a security arrangement comprising an elongated, rigid member having a fixed loop at one end and a latched loop at the other end, first loop means mounted on said door adjacent the side of said door which swings open adapted to engage one of the loops of said elongated member, second loop means mounted on said wall adjacent said first loop means for engaging the other loop of said elongated member, so that when said door is closed said elongated member may be engaged with the loops mounted on said door and said wall, string means tied at one end to said door knob and stretched taut over said elongated member, and means for engagement with the other end of said string means for producing an alarm when the tension in said string means is increased due to an attempted opening of said door causing said elongated member to move.
Claim 3
Dependent Claim
40 words
The security arrangement as recited in claim 1 in which the alarm producing means is a switch mounted on said wall controlling an electrical circuit with said string means looped thereon to throw said switch when said tension is increased.
Claim 4
Dependent Claim
38 words
The security arrangement as recited in claim 2 in which said latched loop on said elongated means consists of a fixed semicircular ring and a pivoted semicircular ring for permitting access of the loop to be engaged therewith.
Claim 5
Dependent Claim
28 words
The security arrangement as recited in claim 3 in which said elongated means is provided with means to prevent said string means from sliding along said elongated means.
Claim 6
Dependent Claim
36 words
The security arrangement as recited in claim 4 in which said door knob is provided with means to restrain said string means so that said switch is thrown by the mere turning of said door knob.
Claim 7
Dependent Claim
23 words
The security arrangement of claim 5 in which the restraining means is a clip mounted on the shaft attached to said door knob.
Claim 8
Dependent Claim
31 words
The security arrangement of claim 5 in which the restraining means is a clamp mounted on said door knob having means to permit said string to be pulled taut and locked.
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) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |