US4224832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromotive power brake
Assignee: ITT Inc
•
Filing: 1978-11-16
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Granted: 1980-09-30
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Expires: 1998-11-16
Abstract
Abstract The power brake includes an electric motor to provide braking power assistance actuated by a brake pedal and a transmission means interconnecting the brake pedal, the motor and a master cylinder piston, the transmission means being actuated by the brake pedal and having a frictional coupling to actuate the master cylinder piston, the friction of the frictional coupling increasing in proportion to the brake pedal pressure.
Inventors
- 👤 Hans Prohaska
- 👤 Karl-Heinz Theurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:51
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/74; B60T13/745; B60T7/00; B60T7/02; B60T7/04; B60T7/042; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19535; Y10T74/20; Y10T74/20528
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
73 words
An electromotive power brake comprising: an electric motor actuated by a brake pedal, said motor providing braking power assistance; a master cylinder having a tappet push rod connected to a master cylinder piston; and transmission means interconnecting said brake pedal, said motor and said tappet push rod, said transmission means having a frictional coupling to actuate said tappet push rod, the friction of said coupling increasing in proportion to the brake pedal pressure.
Claim 2
Dependent Claim
73 words
An electromotive power brake comprising: an electric motor actuated by a brake pedal, said motor providing braking power assistance; a master cylinder having a tappet push rod connected to a master cylinder piston; and transmission means interconnecting said brake pedal, said motor and said tappet push rod, said transmission means having a frictional coupling to actuate said tappet push rod, the friction of said coupling increasing in proportion to the brake pedal pressure.
Claim 3
Dependent Claim
22 words
A power brake according to claim 1, wherein said coupling only acts in one direction from said motor to said brake pedal.
Claim 4
Dependent Claim
46 words
A power brake according to claim 2, wherein said coupling includes a friction disc directly driven by said motor, and a skid band embracing said friction disc and having one end coupled to said brake pedal and the other end coupled to said tappet push rod.
Claim 5
Dependent Claim
64 words
A power brake according to claim 3, wherein said transmission means further includes a push rod element attached to said brake pedal; and a tensioning lever connected to and swivelled by said push rod element about a point of rotation; said one end of said skid band being coupled to said tensioning lever, said tensioning lever stretching said skid band towards said friction disc.
Claim 6
Dependent Claim
26 words
A power brake according to claim 4, wherein said transmission means further includes a spring element connected to said tensioning lever to reset said tensioning lever.
Claim 7
Dependent Claim
28 words
A power brake according to claim 5, wherein said transmission means further includes a cam disposed in said brake pedal and a slot in said push rod element.
Claim 8
Dependent Claim
23 words
A power brake according to claim 1, wherein said transmission means further includes lever transmission means interconnecting said brake pedal and said coupling.
Claim 9
Dependent Claim
40 words
A power brake according to claim 1, wherein said coupling acts in both directions of rotation, and said transmission means further includes an overrunning-clutch drive disposed between said coupling and both of said brake pedal and said tappet push rod.
Claim 10
Dependent Claim
68 words
A power brake according to claim 8, wherein said coupling includes a first friction disc driven by said motor, and a second friction disc connected to said overrunning-clutch drive, said overrunning-clutch drive driving a pinion fixed to a shaft, said pinion mating with a toothed rack attached to said brake pedal and said tappet push rod, said first and second friction discs being axially movable towards each other.
Claim 11
Dependent Claim
44 words
A power brake according to claim 9, wherein said transmission means further includes a pivot disposed in said brake pedal; and a five-lever transmission mechanism interconnecting said pivot and said shaft to translate circular motion at said pivot to straight-line motion at said shaft.
Claim 12
Dependent Claim
25 words
A power brake according to claim 10, wherein said five-lever transmission mechanism includes a driven rocking arm acting on the adjacent end of said shaft.
Claim 13
Dependent Claim
25 words
A power brake according to claim 11, wherein said toothed rack is attached to one lever of said transmission mechanism and said tappet push rod.
Claim 14
Dependent Claim
25 words
A power brake according to claim 12, wherein said first friction disc is secured to a driving shaft of said motor by a cup bearing.
References Cited (Backward Citations)
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Cited
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Cited
US2251267A
Cited
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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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |