US4586030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective grating
Assignee: Individual
•
Filing: 1984-02-01
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Granted: 1986-04-29
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Expires: 2004-02-01
Abstract
Abstract There is provided a protective grating which consists of tube-shaped grating rods disposed parallel to one another and grating rods disposed parallel to one another and at right angles to the tube-shaped grating rods. On respective opposite ends of the tube-shaped grating rods are disposed light sources and light receivers, so that light passes from the light sources through the hollow space of the tube-shaped grating rods to the light receivers. During interruption of the light beam an alarm is triggered.
Inventors
- 👤 Horst Klostermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:30
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/12; G08B13/122
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
A protective grating for guarding building openings and the like, said protective grating comprising straight hollow grating rods having an optical supervisory system for triggering an alarm signal when the grating rods are cut or bent, said optical supervisory system including light diodes and photo diodes disposed on respective opposite ends of said grating rods, the light passing therebetween passing through the hollow space of the grating rods directly from the light diodes to the photo diodes, said protective grating being employed in a fence having hollow fence posts and the hollow grating rods extending horizontally with their ends projecting into the hollow spaces of the fence posts.
Claim 2
Dependent Claim
108 words
A protective grating for guarding building openings and the like, said protective grating comprising straight hollow grating rods having an optical supervisory system for triggering an alarm signal when the grating rods are cut or bent, said optical supervisory system including light diodes and photo diodes disposed on respective opposite ends of said grating rods, the light passing therebetween passing through the hollow space of the grating rods directly from the light diodes to the photo diodes, said protective grating being employed in a fence having hollow fence posts and the hollow grating rods extending horizontally with their ends projecting into the hollow spaces of the fence posts.
Claim 3
Dependent Claim
24 words
The protective grating according to claim 1, wherein said light sources and said light receivers are arranged on rails disposed in said fence posts.
Claim 4
Dependent Claim
22 words
The protective grating according to claim 1, wherein the inner space of the hollow grating rods is entirely filled with transparent material.
Claim 5
Dependent Claim
21 words
The protective grating according to claim 1, wherein the interior of the hollow grating rods is provided with a protective layer.
Claim 6
Dependent Claim
22 words
The protective grating according to claim 1, wherein the inner space of the hollow grating rods is partially filled with transparent material.
References Cited (Backward Citations)
US3183499A
Cited
US4275294A
Cited
GB2038060A
Cited
US4399430A
Cited
GB2098770A
Cited
US4450434A
Cited
US4488040A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |