Patent NL63148C successfully refreshed from Google Patents.
Patent US655463A successfully refreshed from Google Patents.
US4096884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay valve
Assignee: Sloan Transportation Products Inc
•
Filing: 1976-12-20
•
Granted: 1978-06-27
•
Expires: 1996-12-20
Abstract
Abstract A relay valve for use in vehicle air brake systems has a housing with a service port, supply port, delivery ports and an exhaust port. A piston and shuttle are movable within the housing to control communication between the ports. The shuttle carries a seal member which, in the closed position, is in sealing relation with both the piston and the housing, thereby closing communication between the supply and delivery ports and between the delivery and exhaust ports. There are means to vent pressure buildup behind the shuttle seal thereby preventing accidental blowout of the seal.
Inventors
- 👤 Charles Horowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:09
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/18; Y; Y10; Y10S; Y10S251/00; Y10S251/90; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86919
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
A relay valve for use in vehicle air brake systems including a housing having a service port, a supply port, at least one delivery port, and an exhaust port, a piston movable in said housing in response to pressure at said service port to control communication between said supply and delivery ports, a shuttle movable in said housing to control communication between said exhaust and delivery ports, said shuttle having a groove and a seal positioned in said shuttle groove, sealing surfaces on said piston and housing, spring means urging said shuttle seal into sealing engagement with said piston and housing sealing surfaces thereby closing communication between said supply and delivery ports and between exhaust and delivery ports, and vent means connecting said shuttle seal groove and said exhaust port, to prevent pressure buildup behind said shuttle seal.
Claim 2
Dependent Claim
138 words
A relay valve for use in vehicle air brake systems including a housing having a service port, a supply port, at least one delivery port, and an exhaust port, a piston movable in said housing in response to pressure at said service port to control communication between said supply and delivery ports, a shuttle movable in said housing to control communication between said exhaust and delivery ports, said shuttle having a groove and a seal positioned in said shuttle groove, sealing surfaces on said piston and housing, spring means urging said shuttle seal into sealing engagement with said piston and housing sealing surfaces thereby closing communication between said supply and delivery ports and between exhaust and delivery ports, and vent means connecting said shuttle seal groove and said exhaust port, to prevent pressure buildup behind said shuttle seal.
Claim 3
Dependent Claim
42 words
The structure of claim 1 further characterized in that said shuttle seal is annular, with said piston and housing sealing surfaces being annular, said piston sealing surface being in contact with said seal concentrically with and inside of said housing sealing surface.
Claim 4
Dependent Claim
19 words
The structure of claim 2 further characterized in that said shuttle seal is in the form of a ring.
Claim 5
Dependent Claim
52 words
The structure of claim 2 further characterized in that the outer diameter of said piston sealing surface is slightly smaller than the inside diameter of said housing sealing surface, with said sealing surfaces being in contact with said shuttle seal, when in the closed position, at closely spaced points upon said seal.
Claim 6
Dependent Claim
22 words
The structure of claim 4 further characterized in that said piston and housing sealing surfaces are in the form of annular lips.
Claim 7
Dependent Claim
38 words
The structure of claim 1 further characterized in that said vent means includes an annular vent groove opening into said shuttle seal groove and a plurality of passages connecting said vent groove with the interior of said shuttle.
Claim 8
Dependent Claim
62 words
The structure of claim 1 further characterized by and including seal means carried by said shuttle and in sealing engagement with a further portion of said housing, said last-named seal means being concentric with but having an outer diameter less than said first-named shuttle seal whereby said difference in diameters creates a pressure force directing said shuttle toward the described closed position.
Claim 9
Dependent Claim
31 words
The structure of claim 1 further characterized in that said piston and shuttle are coaxially aligned, said shuttle seal being annular in configuration and being coaxial with said piston and shuttle.
References Cited (Backward Citations)
US3945689A
Cited
US3934942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |