Patent US3872953A successfully refreshed from Google Patents.
US3872953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic brake system and valve structure
Assignee: Individual
•
Filing: 1971-03-19
•
Granted: 1975-03-25
•
Expires: 1991-03-19
Abstract
Abstract Disclosed is a hydraulic brake system utilizing a valve operative to lock hydraulic brake fluid in the wheel cylinders. The valve includes a cylindrical body with a horizontal bore passing therethrough and surrounded by an electrically energized coil. A magnetic ball is disposed in an enlarged chamber intermediate the magnetic core and the outlet from the valve and is operative to act as a check valve to limit fluid flow in one direction when the coil is energized. Also disclosed is a circuit for activating the valve which is adapted to operate in conjunction with the brake light switch and ignition switch of a motor vehicle.
Inventors
- 👤 Ewing A Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:56
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/08; B60T17/16; B60R; B60R25/00; B60R25/01; B60R25/08; B60T11/00; B60T11/10; B60T11/16; B60T11/18; B60T11/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
373 words
In a brake system for a wheeled vehicle, including an ignition system having an ignition switch operable to on and off positions, a hydraulic master cylinder, operable by a brake means, a plurality of slave cylinders operable to actuate braking devices at wheels of said vehicle and a fluid conduit connecting the master cylinder to operate at least one slave cylinder, the improvement comprising: a. selectively enabled check valve means having a first bore having one end connected by the fluid conduit to the master cylinder, an enlarged chamber at the other end of said bore, a bore opening through which said first bore communicates with said chamber, a free rolling ball disposed within said chamber, said ball being larger than the diameter of said bore opening but substantially smaller than said chamber, and a second bore providing fluid communication between the chamber and fluid conduit connecting the second bore to said at least one slave cylinder, said valve means permitting fluid flow through said bore in only a first direction from the master cylinder to the slave cylinder when enabled to attract said ball to lodge in the bore openiNg and thereby prevent fluid flow in a second direction from the chamber to the first bore while permitting fluid flow from the bore to the chamber, said valve means permitting fluid flow through said bore in either of said two directions when not enabled and when said ball is not lodged in the bore opening; b. enabling means, coupled with the ignition switch, for enabling said valve means upon operation of the brake means when the ignition switch is off; and c. disabling means, coupled with the ignition switch, for disabling said valve means when the ignition switch is on; d. said ball being drawn toward said bore opening when said enabling means enables said valve and remaining lodged in the bore opening by back pressure from the slave cylinder and preventing fluid flow from the chamber toward the master cylinder until said brake means is operated with the ignition switch on causing said master cylinder to exert fluid pressure against the ball sufficient to dislodge the ball from the bore opening and permit fluid flow in either direction in the bore.
Claim 2
Dependent Claim
373 words
In a brake system for a wheeled vehicle, including an ignition system having an ignition switch operable to on and off positions, a hydraulic master cylinder, operable by a brake means, a plurality of slave cylinders operable to actuate braking devices at wheels of said vehicle and a fluid conduit connecting the master cylinder to operate at least one slave cylinder, the improvement comprising: a. selectively enabled check valve means having a first bore having one end connected by the fluid conduit to the master cylinder, an enlarged chamber at the other end of said bore, a bore opening through which said first bore communicates with said chamber, a free rolling ball disposed within said chamber, said ball being larger than the diameter of said bore opening but substantially smaller than said chamber, and a second bore providing fluid communication between the chamber and fluid conduit connecting the second bore to said at least one slave cylinder, said valve means permitting fluid flow through said bore in only a first direction from the master cylinder to the slave cylinder when enabled to attract said ball to lodge in the bore openiNg and thereby prevent fluid flow in a second direction from the chamber to the first bore while permitting fluid flow from the bore to the chamber, said valve means permitting fluid flow through said bore in either of said two directions when not enabled and when said ball is not lodged in the bore opening; b. enabling means, coupled with the ignition switch, for enabling said valve means upon operation of the brake means when the ignition switch is off; and c. disabling means, coupled with the ignition switch, for disabling said valve means when the ignition switch is on; d. said ball being drawn toward said bore opening when said enabling means enables said valve and remaining lodged in the bore opening by back pressure from the slave cylinder and preventing fluid flow from the chamber toward the master cylinder until said brake means is operated with the ignition switch on causing said master cylinder to exert fluid pressure against the ball sufficient to dislodge the ball from the bore opening and permit fluid flow in either direction in the bore.
Claim 3
Dependent Claim
85 words
A brake system as deined in claim 1 wherein the check valve means includes: a. a body of non-magnetic material having inlet and outlet means, said bore and chamber passing through said body with said bore communicating with said inlet means and said chamber communicating with said outlet means; b. an electrically energized coil wound in a magnetic core substantially surrounding a portion of said bore; wherein said ball is composed of magnetic material and wherein the enabling means comprises means for energizing said coil.
Claim 4
Dependent Claim
23 words
A brake system as defined in claim 2 wherein the valve means is mounted with its outlet end lower than its inlet end.
Claim 5
Dependent Claim
58 words
A brake system as defined in claim 2 wherein said enabling means comprises a voltage source, normally closed switch and a normally open switch connected in series with said coil, means coupling said series connection of said switches and said coil to said voltage source, said normally open switch operable to close when said master cylinder is operated.
Claim 6
Dependent Claim
43 words
A brake system as defined in claim 4 wherein said disabling means comprises circuit means coupled to said voltage source, said circuit means including said ignition switch and a relay operable to open said normally closed switch when said ignition switch is on.
Claim 7
Dependent Claim
238 words
In a hydraulic brake system of a vehicle which includes an ignition switch and a brake peddle, the improvement comprising: a valve for controlling the passage of fluid therethrough including (a) a body of non-magnetic material having inlet and outlet means, (b) a bore passing through said body and communicating with said inlet and outlet means, (c) said body having an enlarged chamber intermediate a portion of said bore and said outlet means, (d) a magnetic ball disposed within said chamber, said ball being of sufficient size to obstruct said portion of the bore, and (e) an electrically energizable magnetic core substantially surrounding said portion of the bore for attracting said magnetic ball to seat in said portion of the bore when energized, to thereby obstruct the passage of fluid from the chamber to said portion of the bore while allowing passage of fluid from said portion of the bore to said chamber, said valve being operable to maintain the ball seated in said portion of the bore when said core is unenergized until said brake peddle is depressed to increase the fluid pressure in said portion of the bore and thereby force the ball from said portion, and a control circuit including (f) first circuit means responsive to the depression of said brake peddle for energizing said core, and (g) second circuit means responsive to the operation of said ignition switch for preventing energization of said core.
Claim 8
Dependent Claim
238 words
In a hydraulic brake system of a vehicle which includes an ignition switch and a brake peddle, the improvement comprising: a valve for controlling the passage of fluid therethrough including (a) a body of non-magnetic material having inlet and outlet means, (b) a bore passing through said body and communicating with said inlet and outlet means, (c) said body having an enlarged chamber intermediate a portion of said bore and said outlet means, (d) a magnetic ball disposed within said chamber, said ball being of sufficient size to obstruct said portion of the bore, and (e) an electrically energizable magnetic core substantially surrounding said portion of the bore for attracting said magnetic ball to seat in said portion of the bore when energized, to thereby obstruct the passage of fluid from the chamber to said portion of the bore while allowing passage of fluid from said portion of the bore to said chamber, said valve being operable to maintain the ball seated in said portion of the bore when said core is unenergized until said brake peddle is depressed to increase the fluid pressure in said portion of the bore and thereby force the ball from said portion, and a control circuit including (f) first circuit means responsive to the depression of said brake peddle for energizing said core, and (g) second circuit means responsive to the operation of said ignition switch for preventing energization of said core.
Claim 9
Dependent Claim
40 words
A brake system as in claim 6 wherein said enlarged chamber is substantially conical, the apex thereof terminating in said portion of the bore, and the base thereof having a bore passing longitudinally tHerethrough and communicating with said outlet means.
Claim 10
Dependent Claim
21 words
A brake system as in claim 6 wherein said valve includes filter means disposed within said inlet and said outlet means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |