Patent US4229320A successfully refreshed from Google Patents.
Patent US4243981A successfully refreshed from Google Patents.
US4243981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionization fire-signal device
Assignee: Individual
•
Filing: 1978-11-17
•
Granted: 1981-01-06
•
Expires: 1998-11-17
Abstract
Abstract An ionization fire-signal device is provided which is compact in construction so that it has a small axial height. The housing for the device includes an axial extending outer wall and a transversely extending front wall to form a cup shaped housing. An insulator, including an axially extending circular wall which forms an enclosure, is positioned inside the housing and cooperates with the housing to form a measuring chamber. The axial dimension of the circular insulator wall and outer housing wall are approximately equal. In addition, a reference chamber is formed between the circular wall of the insulator and the outer wall of the housing such that the reference chamber is arranged transversely adjacent to the measuring chamber. A radiation source for ionizing the measuring chamber and reference chamber is also provided. An electrical alarm signal circuit is also disposed between the circular insulator wall and the outer housing wall and is electrically connected to two electrodes in the measuring chamber and two electrodes in the reference chamber.
Inventors
- 👤 Hartwig Beyersdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:49
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
266 words
An ionization fire-signal device, comprising: a housing including an axially-extending tubular outer wall and a transversely-extending front wall, the axial dimension of said housing being less than the transverse dimension thereof; an insulator positioned inside said housing and including a tubular inner wall positioned coaxially relative to said tubular outer wall; said housing including a concentric section between said tubular inner wall and said tubular outer wall; the outer transverse dimension of said tubular inner wall being less than the inner transverse dimension of said tubular outer wall, and the axial dimension of said tubular inner wall and of said tubular outer wall being approximately equal; said tubular inner wall forming an enclosure for a measuring chamber, said measuring chamber including at least one opening in the front wall of said housing for access of ambient air, said measuring chamber containing two electrodes; two spaced-apart insulating walls positioned in said concentric section and extending radially between said tubular inner wall and said tubular outer wall and forming an enclosure for a reference chamber; said reference chamber extending around a part of said measuring chamber; said reference chamber containing two electrodes electrically connected in series with the two electrodes of said measuring chamber; at least one radiation source for ionizing said measuring chamber and said reference chamber; an electrical alarm signal circuit electrically connected to the electrodes of said measuring and reference chambers; and the circuit elements of said signal circuit being disposed in said concentric section between said tubular inner wall and said tubular outer wall, and insulated from said reference chamber by said insulating walls.
Claim 2
Dependent Claim
266 words
An ionization fire-signal device, comprising: a housing including an axially-extending tubular outer wall and a transversely-extending front wall, the axial dimension of said housing being less than the transverse dimension thereof; an insulator positioned inside said housing and including a tubular inner wall positioned coaxially relative to said tubular outer wall; said housing including a concentric section between said tubular inner wall and said tubular outer wall; the outer transverse dimension of said tubular inner wall being less than the inner transverse dimension of said tubular outer wall, and the axial dimension of said tubular inner wall and of said tubular outer wall being approximately equal; said tubular inner wall forming an enclosure for a measuring chamber, said measuring chamber including at least one opening in the front wall of said housing for access of ambient air, said measuring chamber containing two electrodes; two spaced-apart insulating walls positioned in said concentric section and extending radially between said tubular inner wall and said tubular outer wall and forming an enclosure for a reference chamber; said reference chamber extending around a part of said measuring chamber; said reference chamber containing two electrodes electrically connected in series with the two electrodes of said measuring chamber; at least one radiation source for ionizing said measuring chamber and said reference chamber; an electrical alarm signal circuit electrically connected to the electrodes of said measuring and reference chambers; and the circuit elements of said signal circuit being disposed in said concentric section between said tubular inner wall and said tubular outer wall, and insulated from said reference chamber by said insulating walls.
Claim 3
Dependent Claim
25 words
A device according to claim 1, wherein the axial wall of said insulator includes an outer end which abuts the front wall of said housing.
Claim 4
Dependent Claim
29 words
A device according to claim 1 wherein said opening is formed in the front wall of said housing and is located inwardly from the axial wall of said insulator.
Claim 5
Dependent Claim
21 words
A device according to claim 3 wherein said opening in said front wall is a ring-shaped slit, interrupted by radial bridges.
Claim 6
Dependent Claim
29 words
A device according to claim 1 wherein the front ends of the radially extending walls of the insulator defining the reference chamber abut the front wall of said housing.
Claim 7
Dependent Claim
43 words
A device according to claim 5 wherein said insulator includes a curved wall connecting the radial outer ends of said radially extending walls, said curved wall being adjacent to the outer wall of said housing to insulate said reference chamber from said housing.
Claim 8
Dependent Claim
32 words
A device according to claim 1 wherein at least one of the electrodes of the measuring chamber is flat and is positioned at right angles to the axial wall of said insulator.
Claim 9
Dependent Claim
41 words
A device according to claim 7 wherein said housing is electrically conductive, at least in the area which covers the front end of the measuring chamber, and that said area of the housing serves as an electrode of the measuring chamber.
Claim 10
Independent Claim
32 words
A device according to claims 7 or 8, further including an apron, axially extending into the measuring chamber adjacent said opening for limiting the entry of ambient air to said measuring chamber.
Claim 11
Dependent Claim
62 words
A device according to claim 8 wherein a flat electrode of the measuring chamber is positioned across said area of the housing which spans the front end of the measuring chamber, an insulating layer between said flat electrode and said area, said flat electrode being dimensioned so as to leave an opening around said flat electrode for access of the ambient are.
Claim 12
Dependent Claim
42 words
A device according to claim 10 wherein an apron extends axially into the measuring chamber from the radially outer rim of said flat electrode, said apron having an axial height which is small compared to the axial height of the measuring chamber.
Claim 13
Dependent Claim
28 words
A device according to claim 1 wherein the electrodes of the reference chamber are flat, and are positioned at right angles to the axial wall of said insulator.
Claim 14
Dependent Claim
55 words
A device according to claim 1 wherein said insulator has a rear wall connected with the rear end of said insulator axial wall and lying at right angles to the axis of said insulator axial wall, said rear wall extending radially outward as far as the rear edge of the outer wall of the housing.
Claim 15
Dependent Claim
30 words
A device according to claim 13 wherein said rear wall covers the rear end of the measuring chamber, an electrode being disposed on said rear wall within said measuring chamber.
Claim 16
Independent Claim
25 words
A device according to claims 13 or 14, wherein said rear wall is circular and extends in the circumferential direction over said alarm signal circuit.
Claim 17
Dependent Claim
34 words
A device according to claim 1 wherein the rear side of said insulator is covered by a cover plate, electrically conductive at least on one of its sides, and having a fixed electrical potential.
Claim 18
Dependent Claim
48 words
A device according to claim 1 wherein said reference chamber at its front end is closed off by an insulating wall of said insulator abutting the front wall of said housing, and on the other side of said insulating wall an electrode of the reference chamber is mounted.
Claim 19
Independent Claim
25 words
A device according to claims 12, 16 or 17 further including a cover plate covering said reference chamber and which serves as an electrode thereof.
Claim 20
Dependent Claim
43 words
A device according to claim 1 wherein said reference chamber at its rear end is closed off by a wall sector of said insulator extending in a transverse direction, and on the outer side of said wall sector an electrode of the reference
Claim 21
Dependent Claim
21 words
A device according to claim 1 wherein the circuit elements of said alarm signal circuit are arranged on a circuit plate.
Claim 22
Dependent Claim
26 words
A device according to claim 20 wherein said circuit plate is held at a distance from the rear wall of said insulator by means of spacers.
Claim 23
Dependent Claim
43 words
A device according to claim 21 wherein said spacer is formed by a rim on said insulator axially protruding from the rear wall of said insulator, and with its outer side abutting against the inner side of the outer wall of said housing.
Claim 24
Independent Claim
45 words
A device according to claims 21 or 22, wherein said spacer is formed by elevations in the rear wall of said insulator, said elevations having at their rear side means for fastening the housing and the circuit plate to the rear wall of said insulator.
Claim 25
Independent Claim
27 words
A device according to claims 20 or 21 wherein male plugs are mounted in said circuit plate, said plugs extending through the rear wall of said insulator.
Claim 26
Dependent Claim
55 words
A device according to claim 1 wherein said insulator includes a rear wall and a curved wall having a surrounding annular flange, the rear edge of the outer wall of the housing axially abutting thereon, the radially outer side of said flange being flush with the outer side of the outer wall of the housing.
Claim 27
Dependent Claim
32 words
A device according to claim 25 further including a cover plate, said rear wall and said curved wall having an annular axial extension surrounding the radially outer edge of said cover plate.
Claim 28
Dependent Claim
24 words
A device according to claim 1 wherein the volume of the reference chamber is 50% to 85% of the volume of the measuring chamber.
Claim 29
Dependent Claim
23 words
A device according to claim 1 wherein the volume of the reference chamber is approximately 70% of the volume of the measuring chamber.
Claim 30
Dependent Claim
20 words
A device according to claim 1 wherein said measuring and reference chambers each include a radiation source having identical activities.
Claim 31
Dependent Claim
36 words
A device according to claim 1 wherein said insulator axial wall is circular in shape and the inner diameter thereof is 40% to 50% of the smallest outer dimension of the outer wall of said housing.
Claim 32
Dependent Claim
30 words
A device according to claim 1 wherein said insulator axial wall is circular in shape and the reference chamber surrounds the measuring chamber for an angle of 80° to 140°.
Claim 33
Dependent Claim
20 words
A device according to claim 31 wherein the reference chamber surrounds the measuring chamber for an angle of approximately 110°.
Claim 34
Dependent Claim
22 words
A device according to claim 1 wherein the axial height of the housing is 25% to 50% of its smallest transverse dimension.
Claim 35
Dependent Claim
21 words
A device according to claim 33 wherein the axial height of the housing is approximately 30% of its smallest transverse dimension.
References Cited (Backward Citations)
US3728706A
Cited
DE2162788A1
Cited
US3842409A
Cited
US3934145A
Cited
DE2450601C3
Cited
DE2403418C2
Cited
DE2520929A1
Cited
US4058803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |