US3929150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sillcock incorporating an antisiphon and backflow preventer
Assignee: Mansfield Plumbing Products LLC
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Filing: 1974-10-09
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Granted: 1975-12-30
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Expires: 1994-10-09
Abstract
Abstract Disclosed is an improved sillcock valving mechanism that employs a valving element carried on a piston that is slidably mounted on a valve stem and a valve seat engageable by the valving element. A handle is operated to close the sillcock and to open the sillcock. Normal line pressure holds the valving mechanism open, when so permitted by the position of the valve stem, but when the line pressure drops below a predetermined value a spring that applies continuous biasing pressure on the piston forces the valving element into sealing engagement with the valve seat (irrespective of the position of the valve stem) to prevent backflow through the sillcock and into the supply line. A second valving mechanism controls communication between the first passageway and a second passageway which extends within the valve stem and opens to atmosphere. The second valving mechanism opens to preclude siphoning in response to that closure of the first valving mechanism effected by the pressure of the fluid supply line dropping below a predetermined value. Because the piston is rotatable with respect to the valve stem, relative rotation between the valving element and the valve seat is precluded with an attendant reduction in deleterious wear to the valving element.
Inventors
- 👤 Vaughn D Flinner
- 👤 Richard W Sprang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:50
CPC Classifications
F; F16; F16K; F16K24/00; E; E03; E03B; E03B7/00; E03B7/09; E03B7/10; E03B7/12; E03B9/00; E03B9/02; E03B9/025; F16K15/00; F16K15/02; F16K15/06; F16K15/063; F16K15/18; F16K15/182; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3294; Y10T137/3331; Y10T137/7722; Y10T137/7837; Y10T137/7876; Y10T137/7877
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
302 words
A sillcock comprising; a barrel having an axially inner and an axially outer end portion; a first passageway extending through said barrel; connector means at the axially inner end portion of said barrel adapted for securing said barrel to a pressurized fluid supply line; a spout communicating with said first passageway; a valve stem having axially inner and axially outer end portions and extending axially within said first passageway; a second passageway extending through said valve stem opening to the atmosphere; a handle secured to the axially outer end portion of said valve stem for selectively displacing said valve stem axially between an open and a closed position while permitting said second passageway to communicate to the atmosphere; a valve seat circumscribing said first passageway within said barrel and disposed between said connector means and said spout; a piston mounted within the axially inner end portion of said valve stem so as to be movable axially between a retracted and protracted position with respect to said valve stem; a valving element mounted on said piston in opposition to said valve seat; means on said valve stem to engage said piston in its retracted position and maintain said valve element in sealing engagement with said valve seat when said valve stem is in closed position; and, biasing means acting between said valve stem and said piston continuously to urge said piston toward its protracted position to maintain said valve element in sealing engagement with said valve seat throughout the range of axial movement available to said valve stem between said open and closed positions when the pressure within said fluid supply line falls below a predetermined value thereby preventing backflow and simultaneously permiting communication between said first passageway and said second passageway to release backpressure present to the atmosphere through said second passageway.
Claim 2
Dependent Claim
302 words
A sillcock comprising; a barrel having an axially inner and an axially outer end portion; a first passageway extending through said barrel; connector means at the axially inner end portion of said barrel adapted for securing said barrel to a pressurized fluid supply line; a spout communicating with said first passageway; a valve stem having axially inner and axially outer end portions and extending axially within said first passageway; a second passageway extending through said valve stem opening to the atmosphere; a handle secured to the axially outer end portion of said valve stem for selectively displacing said valve stem axially between an open and a closed position while permitting said second passageway to communicate to the atmosphere; a valve seat circumscribing said first passageway within said barrel and disposed between said connector means and said spout; a piston mounted within the axially inner end portion of said valve stem so as to be movable axially between a retracted and protracted position with respect to said valve stem; a valving element mounted on said piston in opposition to said valve seat; means on said valve stem to engage said piston in its retracted position and maintain said valve element in sealing engagement with said valve seat when said valve stem is in closed position; and, biasing means acting between said valve stem and said piston continuously to urge said piston toward its protracted position to maintain said valve element in sealing engagement with said valve seat throughout the range of axial movement available to said valve stem between said open and closed positions when the pressure within said fluid supply line falls below a predetermined value thereby preventing backflow and simultaneously permiting communication between said first passageway and said second passageway to release backpressure present to the atmosphere through said second passageway.
Claim 3
Dependent Claim
45 words
A sillcock, as set forth in claim 1, in which said barrel and said valve stem are of sufficient axial extent that when said spout is positioned in proximity to the exterior wall of a building said valve seat is located interiorily of the building.
Claim 4
Dependent Claim
54 words
A sillcock, as set forth in claim 1, in which said valve seat comprises at least first and second axially displaced, concentric shoulders and said first valve element comprises an elastomeric body portion engaging said first shoulder and an annular, radially extending, flexible skirt engaging said second shoulder sealingly to close said first passageway.
Claim 5
Dependent Claim
76 words
A sillcock, as set forth in claim 1, said valve stem further comprising threads meshingly to engage a corresponding set of threads presented in opposition thereto from the interior of said barrel, said handle being rotatable to displace said valve stem axially with respect to said barrel by virtue of the engagement of said threads, at least one set of said threads being fluted to permit said first passageway to communicate through said meshingly engaged threads.
Claim 6
Dependent Claim
27 words
A sillcock, as set forth in claim 4, in which said piston is mounted for rotational as well as axial movement with respect to said valve stem.
Claim 7
Dependent Claim
41 words
A sillcock, as set forth in claim 1, further comprising a second valving element located down stream with respect to said first valve element to permit selective communication between said first and said second passageway, and actuated by said biasing means.
Claim 8
Dependent Claim
73 words
A sillcock, as set forth in claim 6, in which said second valve element is also supported on said piston, said second valve element closing communication between said first and second passageways when said piston is in its retracted position and opening communication between said first and second passageways when said piston is in its protracted position by action of said biasing means against a fluid line supply pressure of a predetermined value.
Claim 9
Dependent Claim
188 words
An improved sillcock comprising: a spout; a barrel having a first passageway communicating with said spout; means on said barrel opposite said spout for connecting said barrel to a fluid supply line; said barrel being of sufficient length to extend from said spout when it is mounted exteriorily of a building to a fluid supply line located within the building; a first valving mechanism mounted within said barrel, and in proximity to the fluid supply line, to control the flow of fluid through the sillcock; a valve stem extending axially within said barrel, connected to said first valving mechanism, to effect manual actuation of said first valving mechanism; a second passageway extending axially within said valve stem which opens to the atmosphere; a second valving mechanism to control communication between said first and said second passageways; and, means acting between said valve stem and said first and said second valving mechanisms to actuate said first and said second valving mechanisms in response to the pressure within the fluid supply line so as to prevent flow into the fluid supply line and relieve back pressure present to the atmosphere.
Claim 10
Dependent Claim
188 words
An improved sillcock comprising: a spout; a barrel having a first passageway communicating with said spout; means on said barrel opposite said spout for connecting said barrel to a fluid supply line; said barrel being of sufficient length to extend from said spout when it is mounted exteriorily of a building to a fluid supply line located within the building; a first valving mechanism mounted within said barrel, and in proximity to the fluid supply line, to control the flow of fluid through the sillcock; a valve stem extending axially within said barrel, connected to said first valving mechanism, to effect manual actuation of said first valving mechanism; a second passageway extending axially within said valve stem which opens to the atmosphere; a second valving mechanism to control communication between said first and said second passageways; and, means acting between said valve stem and said first and said second valving mechanisms to actuate said first and said second valving mechanisms in response to the pressure within the fluid supply line so as to prevent flow into the fluid supply line and relieve back pressure present to the atmosphere.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |