US3693401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for checking operation of smoke detectors
Assignee: Cerberus AG
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Filing: 1970-11-13
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Granted: 1972-09-26
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Expires: 1990-11-13
Abstract
Abstract A testing device for smoke detectors wherein a housing is placed over the detector under test and a test medium is sprayed into the housing. The smoke detector responds to the test medium to indicate operability thereof. The internal volume of the housing is equal to at least twice the internal volume of the smoke detector under test.
Inventors
- 👤 Gustav Purt
- 👤 Walter Bosshard
- 👤 Gerhard Meier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:43
CPC Classifications
B; B65; B65D; B65D83/00; B65D83/14; B65D83/28; G; G08; G08B; G08B29/00; G08B29/12; G08B29/14; G08B29/145
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
168 words
A device for testing the operation of smoke detector devices, comprising a housing member (1, 2) having an open portion adapted to be placed over a smoke detector device (16) under test, and enclosing an internal space for the generation of aerosol spray therein, and having means preventing entry of the smoke detector device into a portion of said internal space, to leave said portion unobstructed by the smoke detector device; a spray means (6) including: a container (7) containing a non-poisonous carrier medium liquified under pressure and having a boiling point in the range of -20* C to +20* C; a spray valve (8) coupled to said container (7); and means including a nozzle coupling said spray valve (8) into the interior of said housing member (1, 2) and directing spray of said carrier medium into said portion of the internal space; and actuating means coupled to said valve (8) to deliver said liquid medium as a spray into the interior of said housing member (1, 2).
Claim 2
Independent Claim
168 words
A device for testing the operation of smoke detector devices, comprising a housing member (1, 2) having an open portion adapted to be placed over a smoke detector device (16) under test, and enclosing an internal space for the generation of aerosol spray therein, and having means preventing entry of the smoke detector device into a portion of said internal space, to leave said portion unobstructed by the smoke detector device; a spray means (6) including: a container (7) containing a non-poisonous carrier medium liquified under pressure and having a boiling point in the range of -20* C to +20* C; a spray valve (8) coupled to said container (7); and means including a nozzle coupling said spray valve (8) into the interior of said housing member (1, 2) and directing spray of said carrier medium into said portion of the internal space; and actuating means coupled to said valve (8) to deliver said liquid medium as a spray into the interior of said housing member (1, 2).
Claim 3
Dependent Claim
16 words
The device of claim 1 wherein said carrier medium comprises at least one fully halogenated hydrocarbon.
Claim 4
Dependent Claim
41 words
The device of claim 2 wherein said carrier medium comprises a mixture of two halogenated hydrocarbons, of which one has a boiling point below -20* C and the other of which has a boiling point between 0* C and +10* C.
Claim 5
Dependent Claim
16 words
The device of claim 3 wherein said carrier medium comprises a mixture of dichlorfluormethane and dichlortetrafluorethane.
Claim 6
Dependent Claim
20 words
The device of claim 4 wherein said carrier medium comprises between 10 percent and 90 percent by volume of dichlortetrafluorethane.
Claim 7
Dependent Claim
19 words
The device of claim 1 wherein said housing member forms a test chamber around said smoke detector under test.
Claim 8
Dependent Claim
37 words
The device of claim 1 in combination with a smoke detector wherein said portion of the internal space of said housing has a volume which is at least equal to the internal volume of the smoke detector.
Claim 9
Dependent Claim
20 words
The device of claim 1 wherein said housing member comprises a resiliently deformable bellows member (2) having said open portion.
Claim 10
Dependent Claim
21 words
The device of claim 1 wherein said spray valve (8) delivers a predetermined quantity of said liquid at each actuation thereof.
Claim 11
Dependent Claim
34 words
The device of claim 1 for application against a fixed surface wherein said actuating means operates said spray valve (8) in response to pressure applied to said actuating means relative to the fixed surface.
Claim 12
Dependent Claim
49 words
The device of claim 10 wherein said actuating means includes an actuator member (12) slideably mounted in said housing (1, 2) and operatingly coupled to said spray valve (8); and means for moving said actuator member (12) to operate said valve (8) in response to said applied relative pressure.
Claim 13
Dependent Claim
35 words
The device of claim 11 wherein said moving means includes means engaging said Smoke detector under test when said relative pressure is applied, and for moving said actuator member (12) responsive to said applied pressure.
Claim 14
Dependent Claim
50 words
The device of claim 1 in combination with a smoke detector device mounted on a fixed surface, wherein said actuating means operates said spray valve (8) in response to pressure applied to said actuating means relative to the fixed surface to which said smoke detector (16) under test is mounted.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |