US3759288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety valve assembly
Assignee: Aisin Corp
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Filing: 1971-04-08
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Granted: 1973-09-18
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Expires: 1991-04-08
Abstract
Abstract This invention relates to improvements in and relating to a safety valve assembly, especially to be fitted in the hydraulic brake system for wheels of an automotive vehicle, although the invention may find its application in other uses in a hydraulic pressure piping system. The safety valve assembly is adapted for operation to close the hydraulic pressure piping system when the outlet liquid quantity exceeds the inlet liquid quantity over a certain predetermined degree. This feature is especially valuable to interrupt oil outlet, when, as an example, a burst or the like cause should take place in the brake piping system.
Inventors
- 👤 U Kobashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:03
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/226; B60T11/00; B60T11/10; B60T11/28; B60T11/32; B60T11/323; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/141; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7785; Y10T137/7792
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
188 words
A safety valve assembly comprising a stationary valve body housing, an inlet port, an outlet port, said port being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and the smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second chamber formed within said bore and defined in part by said smaller piston part, said second chamber being a hydraulic chamber disposed in fluid communication with said outlet port with the outer end of said smaller piston being exposed to atmospheric pressure, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet poRt and said outlet port and variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction.
Claim 2
Dependent Claim
188 words
A safety valve assembly comprising a stationary valve body housing, an inlet port, an outlet port, said port being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and the smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second chamber formed within said bore and defined in part by said smaller piston part, said second chamber being a hydraulic chamber disposed in fluid communication with said outlet port with the outer end of said smaller piston being exposed to atmospheric pressure, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet poRt and said outlet port and variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction.
Claim 3
Dependent Claim
163 words
A safety valve assembly comprising a stationary valve body housing , an inlet port, an outlet port, said port being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and a smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second atmospheric pressure chamber formed within said bore and defined in part by said smaller piston part, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet port and said outlet port and variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction.
Claim 4
Dependent Claim
163 words
A safety valve assembly comprising a stationary valve body housing , an inlet port, an outlet port, said port being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and a smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second atmospheric pressure chamber formed within said bore and defined in part by said smaller piston part, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet port and said outlet port and variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction.
Claim 5
Dependent Claim
203 words
A safety valve assembly comprising a stationary valve body housing, an inlet port, an outlet port, said ports being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and a smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second chamber formed within said bore and defined in part by said smaller piston part, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet port and said outlet port and variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction, said variable orifice means being comprised of a first ring-shaped recess formed on the wall of said bore and a second ring-shaped recess formed on said piston and kept in fluid communication with said passage means formed within the body of said piston.
Claim 6
Dependent Claim
203 words
A safety valve assembly comprising a stationary valve body housing, an inlet port, an outlet port, said ports being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and a smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second chamber formed within said bore and defined in part by said smaller piston part, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet port and said outlet port and variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction, said variable orifice means being comprised of a first ring-shaped recess formed on the wall of said bore and a second ring-shaped recess formed on said piston and kept in fluid communication with said passage means formed within the body of said piston.
Claim 7
Dependent Claim
17 words
A safety valve as set forth in claim 3 wherein said second recess has a tapered bottom.
Claim 8
Dependent Claim
231 words
A safety valve assembly comprising a stationary valve body housing, an inlet port, an outlet port, said ports being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and a smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second chamber formed within said bore and defined in part by said smaller piston part, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet port and said outlet port, variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction and locking means for locking said piston in a position with said variable orifice means closed when pressure difference as measured between said inlet port and said outlet port is larger than a predetermined value, said locking means comprising a ring-shaped groove formed on the outer periphery of said larger piston part and a ball mounted in a passage formed in said valve body and urged by a spring towards said groove.
Claim 9
Dependent Claim
231 words
A safety valve assembly comprising a stationary valve body housing, an inlet port, an outlet port, said ports being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and a smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second chamber formed within said bore and defined in part by said smaller piston part, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet port and said outlet port, variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction and locking means for locking said piston in a position with said variable orifice means closed when pressure difference as measured between said inlet port and said outlet port is larger than a predetermined value, said locking means comprising a ring-shaped groove formed on the outer periphery of said larger piston part and a ball mounted in a passage formed in said valve body and urged by a spring towards said groove.
Claim 10
Dependent Claim
260 words
A safety valve assembly comprising a pair of safety valve elements, each of the latter comprising a stationary valve body housing, an inlet port, an outlet port, said ports being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and a smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second chamber formed within said bore and defined in part by said smaller piston part, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet port and said outlet port, a variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction, locking means for locking said piston when said piston is disposed in a position in which said fluid passage means is completely closed when the pressure differences as measured between said inlet port and said outlet port is larger than a predetermined value and additional fluid passage means for connecting said inlet port of one of said safety valve elements with said outlet port of the other of said safety valve elements when said piston of said one of said safety valve elements is locked by said locking means.
Claim 11
Dependent Claim
260 words
A safety valve assembly comprising a pair of safety valve elements, each of the latter comprising a stationary valve body housing, an inlet port, an outlet port, said ports being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and a smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second chamber formed within said bore and defined in part by said smaller piston part, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet port and said outlet port, a variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction, locking means for locking said piston when said piston is disposed in a position in which said fluid passage means is completely closed when the pressure differences as measured between said inlet port and said outlet port is larger than a predetermined value and additional fluid passage means for connecting said inlet port of one of said safety valve elements with said outlet port of the other of said safety valve elements when said piston of said one of said safety valve elements is locked by said locking means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |