US4893691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic braking system for a vehicle
Assignee: Individual
•
Filing: 1988-02-12
•
Granted: 1990-01-16
•
Expires: 2008-02-12
Abstract
Abstract An automatic braking system for a vehicle having a multichambered brake unit includes a control unit movement of the vehicle or obstacles behind the vehicle. This control unit is interconnected with a three-directional electromagnetic valve for controlling pressures within the various chambers of the brake unit. The system can prevent unwanted rearward movement of a vehicle when it is has been stopped on a slope or flat surface and is restarted. Further, obstacles behind the vehicle can be sensed when the vehicle is in reverse and a warning may be provided to the driver. If the vehicle continues to approach the obstacles, the braking system can stop the movement of the vehicle before an accident can occur.
Inventors
- 👤 Jong S. Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:42
CPC Classifications
B; B60; B60T; B60T7/00; B60T7/12; B60T7/122; B60T13/00; B60T13/10; B60T13/66; B60T13/72
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
An automatic braking system for a vehicle comprising: a brake pedal; a master cylinder; a first power brake cylinder having a first diaphragm and a plate which is provided with a valve rod connected to the brake pedal and a push rod connected to the master cylinder; a valve cylinder axially extending generally perpendicular to the plate; a second power brake cylinder; a vacuum pipe connecting said first power brake cylinder to said second power brake cylinder; a three-directional electromagnetic valve positioned in said vacuum pipe, said three-directional electromagnetic valve being movable to switch said vacuum pipe between atmosphere or vacuum; and control means connected electrically with said three-directional electromagnetic valve for sensing one of forward and backward movement of the vehicle.
Claim 2
Dependent Claim
122 words
An automatic braking system for a vehicle comprising: a brake pedal; a master cylinder; a first power brake cylinder having a first diaphragm and a plate which is provided with a valve rod connected to the brake pedal and a push rod connected to the master cylinder; a valve cylinder axially extending generally perpendicular to the plate; a second power brake cylinder; a vacuum pipe connecting said first power brake cylinder to said second power brake cylinder; a three-directional electromagnetic valve positioned in said vacuum pipe, said three-directional electromagnetic valve being movable to switch said vacuum pipe between atmosphere or vacuum; and control means connected electrically with said three-directional electromagnetic valve for sensing one of forward and backward movement of the vehicle.
Claim 3
Dependent Claim
34 words
The automatic braking system for a vehicle according to claim 1, wherein the second power brake cylinder is positioned at a rear end of the valve cylinder apart from the first power brake cylinder.
Claim 4
Dependent Claim
26 words
The automatic braking system for a vehicle according to claim 1, wherein the second power brake cylinder is integrally combined with the first power brake cylinder.
Claim 5
Dependent Claim
24 words
The automatic braking system for a vehicle according to claim 1, wherein the vacuum pipe further comprises a vacuum tank having a check valve.
Claim 6
Dependent Claim
38 words
The automatic braking system for a vehicle according to claim 1, wherein the control means further comprises a forward sensor for sensing forward movement and a backward sensor for sensing backward movement of a wheel of the vehicle.
Claim 7
Dependent Claim
37 words
The automatic braking system for a vehicle according to claim 5, wherein the vehicle includes at least a gear lever and wherein forward and backward sensors are switched in response to the position of the gear lever.
Claim 8
Dependent Claim
50 words
The automatic braking system for a vehicle according to claim 5, wherein the control means further comprises a long range sensor and a short range sensor both of said range sensors sensing an obstacle located behind the vehicle and being operative in response to the position of the gear lever.
References Cited (Backward Citations)
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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) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |