US3726050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire prevention device
Assignee: R & G Sloane Manufacturing Co Inc us
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Filing: 1970-12-11
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Granted: 1973-04-10
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Expires: 1990-12-11
Abstract
Abstract Apparatus for preventing the spread of fire in a plastic article such as a pipe section extending through a fire-resistant wall or floor is hereby disclosed. The apparatus generally includes a sleeve member which surrounds the plastic pipe extending through the wall, the sleeve being provided with a shutter device which is pivotally mounted on the sleeve and which is biased against the plastic pipe so that the shutter serves to block the passage through the sleeve member when the pipe is sufficiently softened in the presence of fire. The shutter device may be any of several configurations including a flapper valve or a rotary plate construction. Such apparatus may be installed on either or both sides of the wall or floor through which the plastic pipe section passes.
Inventors
- 👤 E Wise
- 👤 A Friend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:11
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/12; F; F16; F16K; F16K17/00; F16K17/18; F16K17/36; F16K17/38; F16K17/386; F16K7/00; F16K7/02; F16L; F16L5/00; F16L5/02; F16L5/04; F16L55/00; F16L55/10; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1819; Y10T137/6851; Y10T137/6966; Y10T137/6969; Y10T137/698
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
118 words
Apparatus for preventing the spread of fire through a passage in a wall or floor comprising: a. a sleeve member located at the intersection of the passage with the wall or floor, said sleeve member having an opening therethrough in alignment with said passage for receiving a thermoplastic pipe section, b. a thermoplastic pipe section extending through said opening of said sleeve member, c. a first shutter member pivotally mounted on the sleeve member externally of said wall or floor, and d. means for biasing said first shutter member into engagement with the pipe section to enable said shutter member to close the end of the sleeve member when the pipe section softens in the presence of fire.
Claim 2
Dependent Claim
118 words
Apparatus for preventing the spread of fire through a passage in a wall or floor comprising: a. a sleeve member located at the intersection of the passage with the wall or floor, said sleeve member having an opening therethrough in alignment with said passage for receiving a thermoplastic pipe section, b. a thermoplastic pipe section extending through said opening of said sleeve member, c. a first shutter member pivotally mounted on the sleeve member externally of said wall or floor, and d. means for biasing said first shutter member into engagement with the pipe section to enable said shutter member to close the end of the sleeve member when the pipe section softens in the presence of fire.
Claim 3
Dependent Claim
96 words
The apparatus of claim 1 wherein the sleeve member extends through the passage of the wall or floor and both ends of the sleeve member project beyond the wall or floor, and further comprising: a. a second shutter member pivotally mounted on the sleeve member externally of said wall or floor opposite that of said first shutter member, and b. means for biasing said second shutter member into engagement with the pipe section to enable said shutter member to close the end of the sleeve member when the pipe section softens in the presence of fire.
Claim 4
Dependent Claim
61 words
The apparatus of claim 2 wherein at least one shutter member is mounted so as to pivot in a plane which is perpendicular to the wall or floor through which the pipe section passes and wherein at least one of said biasing means comprises the weight of the respective shutter member acting on the pipe section under the force of gravity.
Claim 5
Dependent Claim
61 words
The apparatus of claim 2 wherein at least one shutter member is mounted so as to pivot in a plane which is parallel to the wall or floor through which the pipe section passes and wherein at least one of said biasing means comprises the weight of the respective shutter member acting on the pipe section under the force of gravity.
Claim 6
Dependent Claim
61 words
The apparatus of claim 2 wherein at least one shutter member is mounted so as to pivot in a plane which is perpendicular to the wall or floor through which the pipe section passes and wherein at least one of said biasing means comprises a weight connected to the respective shutter member and urging it into engagement with said pipe section.
Claim 7
Dependent Claim
61 words
The apparatus of claim 2 wherein at least one shutter member is mounted so as to pivot in a plane whiCh is parallel to the wall or floor through which the pipe section passes and wherein at least one of said biasing means comprises a weight connected to the respective shutter member and urging it into engagement with said pipe section.
Claim 8
Dependent Claim
61 words
The apparatus of claim 2 wherein at least one shutter member is mounted so as to pivot in a plane which is perpendicular to the wall or floor through which the pipe section passes and wherein at least one of said biasing means comprises a spring connected to the respective shutter member and urging it into engagement with said pipe section.
Claim 9
Dependent Claim
61 words
The apparatus of claim 2 wherein at least one shutter member is mounted so as to pivot in a plane which is parallel to the wall or floor through which the pipe section passes and wherein at least one of said biasing means comprises a spring connected to the respective shutter member and urging it into engagement with said pipe section.
Claim 10
Dependent Claim
35 words
The apparatus as claimed in claim 2 wherein said sleeve member is formed with a slanted surface on both ends to aid in closing both ends of the sleeve member in the presence of fire.
Claim 11
Dependent Claim
33 words
The apparatus of claim 1 wherein the first shutter member is mounted so as to pivot in a plane which is perpendicular to the wall or floor through which the pipe section passes.
Claim 12
Dependent Claim
33 words
The apparatus as claimed in claim 10 wherein said sleeve member is formed with a slanted end surface to aid in closing the end of the sleeve member in the presence of fire.
Claim 13
Dependent Claim
33 words
The apparatus of claim 1 wherein the first shutter member is mounted so as to pivot in a plane which is parallel to the wall or floor through which the pipe section passes.
Claim 14
Dependent Claim
27 words
The apparatus of claim 1 wherein said biasing means comprises the weight of said first shutter member acting on said pipe section under the force of gravity.
Claim 15
Dependent Claim
27 words
The apparatus of claim 1 wherein said biasing means comprises a weight connected to said first shutter member and urging it into engagement with said pipe section.
Claim 16
Dependent Claim
33 words
The apparatus of claim 14 further comprising: (a) a rocker arm connected to said shutter member, and (b) wherein the weight is connected to the rocker arm and thereby said first shutter member.
Claim 17
Dependent Claim
27 words
The apparatus of claim 1 wherein said biasing means comprises a spring connected to said first shutter member and urging it into engagement with said pipe section.
Claim 18
Dependent Claim
33 words
The apparatus as claimed in claim 1 wherein said sleeve member is formed with a slanted end surface to aid in closing the end of the sleeve member in the presence of fire.
References Cited (Backward Citations)
GB411253A
Cited
US2461392A
Cited
US2861586A
Cited
US3023447A
Cited
US3076068A
Cited
US3565103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |