US3799670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke detector
Assignee: PYROTECTOR EUROP GmbH
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Filing: 1972-08-21
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Granted: 1974-03-26
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Expires: 1992-08-21
Abstract
Abstract A smoke detector assembly in which the components are designed for rapid assembly with a minimum amount of labor, in which a molded mounting plate and a molded retaining plate co-operate with a cylindrical labyrinth wall to form a dark chamber into which smoke can diffuse from either side. The molded components are provided with inter-engaging portions to eliminate any possibility of improper assembly. In one embodiment of the invention the photo-cell for detecting the presence of smoke is positioned to view the dark chamber through the mounting plate axially of the labyrinth wall, whereby the reflected light received by the photo-cell under conditions of no-smoke is a minimum. In another embodiment of the invention the rear face of the mounting plate also serves as the support for various electronic components of the detector circuit, and is provided with rearwardly extending connectors for insertion into suitable sockets in a mounting box.
Inventors
- 👤 H Kohr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:56
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/103; G08B17/107; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
A smoke detector assembly, comprising a mounting box having a wall with integrally molded receptacles, a support plate having rearwardly extending plugs to orient said support plate laterally and rotationally in relation to said mounting box, a housing removably mounted on the forward face of said support plate, said housing being shaped and arranged to form, with said plate, a dark chamber with means permitting ambient atmosphere to diffuse into said chamber, said housing and said plate having interengaging means to position said housing laterally and rotationally in relation to said plate.
Claim 2
Dependent Claim
92 words
A smoke detector assembly, comprising a mounting box having a wall with integrally molded receptacles, a support plate having rearwardly extending plugs to orient said support plate laterally and rotationally in relation to said mounting box, a housing removably mounted on the forward face of said support plate, said housing being shaped and arranged to form, with said plate, a dark chamber with means permitting ambient atmosphere to diffuse into said chamber, said housing and said plate having interengaging means to position said housing laterally and rotationally in relation to said plate.
Claim 3
Dependent Claim
92 words
A smoke detector as set out in claim 1 in which said support plate includes a lamp socket so positioned that a lamp bulb mounted therein protrudes forwardly from the support plate, said housing has a laterally extending portion enclosing said bulb and means projecting light from said bulb across said dark chamber in a direction generally parallel to the front surface of the support plate, and a photo-cell mounted on said support plate and viewing the dark chamber in a direction generally perpendicular to the front surface of the support plate.
Claim 4
Dependent Claim
97 words
A smoke detector assembly as set out in claim 1 in which said support plate carries all of the electricial components necessary for the detection of smoke and for actuating an alarm device, including light producing means projecting forwardly from the support plate, said housing having means receiving light from said light producing means and projecting it across the dark chamber in a direction generally perpendicular to the walls of the dark chamber and parallel to the support plate, said support having photo-responsive means viewing said dark chamber in a direction generally perpendicular to the support plate.
Claim 5
Dependent Claim
109 words
A smoke detector assembly comprising a support plate carrying on the rear face thereof the components necessary for the detection of smoke and removably carrying on the forward face thereof a housing shaped and arranged to form with said support plate a dark chamber, said support plate carrying lamp bulb receiving means so positioned that a lamp bulb assembled therein projects forwardly from the support plate to project a light beam across said chamber, said support plate carrying photo-responsive means positioned to view said dark chamber forwardly from the plate, said plate and said housing having interengaging means which orient said housing on said plate both transversely and rotationally.
Claim 6
Dependent Claim
109 words
A smoke detector assembly comprising a support plate carrying on the rear face thereof the components necessary for the detection of smoke and removably carrying on the forward face thereof a housing shaped and arranged to form with said support plate a dark chamber, said support plate carrying lamp bulb receiving means so positioned that a lamp bulb assembled therein projects forwardly from the support plate to project a light beam across said chamber, said support plate carrying photo-responsive means positioned to view said dark chamber forwardly from the plate, said plate and said housing having interengaging means which orient said housing on said plate both transversely and rotationally.
Claim 7
Dependent Claim
183 words
A smoke detector assembly of the type in which a photo-cell responds to light reflEcted from smoke particles in a light beam, comprising a support plate, a retaining plate assembled onto the forward face of the support plate and having a medial portion spaced therefrom and a labyrinth wall retained between the support plate and the medial portion of the retaining plate, said wall and said plates forming a dark chamber with means between the wall and the plates to permit ambient atmosphere to diffuse into the chamber, said retaining plate having enclosures extending laterally from the labyrinth wall, said retaining plate and said support plate having interengaging means positioning said plates laterally and rotationally in relation to each other, and means for mounting a light bulb on the support plate so that it extends into one of said enclosures, lens means in said enclosure for projecting light from said bulb across the labyrinth in a direction perpendicular to the wall thereof, and photo-responsive means on said support plate viewing the interior of the labyrinth in a direction parallel to the labyrinth wall.
Claim 8
Dependent Claim
183 words
A smoke detector assembly of the type in which a photo-cell responds to light reflEcted from smoke particles in a light beam, comprising a support plate, a retaining plate assembled onto the forward face of the support plate and having a medial portion spaced therefrom and a labyrinth wall retained between the support plate and the medial portion of the retaining plate, said wall and said plates forming a dark chamber with means between the wall and the plates to permit ambient atmosphere to diffuse into the chamber, said retaining plate having enclosures extending laterally from the labyrinth wall, said retaining plate and said support plate having interengaging means positioning said plates laterally and rotationally in relation to each other, and means for mounting a light bulb on the support plate so that it extends into one of said enclosures, lens means in said enclosure for projecting light from said bulb across the labyrinth in a direction perpendicular to the wall thereof, and photo-responsive means on said support plate viewing the interior of the labyrinth in a direction parallel to the labyrinth wall.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |