US3673563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle brake condition testing and signalling arrangement
Assignee: Rheinbraun AG
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Filing: 1971-05-04
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Granted: 1972-06-27
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Expires: 1991-05-04
Abstract
Abstract An arrangement for monitoring and testing of the wear state of mechanical brakes. The movable member which is to be braked operates in conjunction with a signal emitter that emits pulses as a function of the displacement of the movable member. A measuring arrangement is actuated by the pulses from the signal emitter and provides an indication of the braking interval between two predetermined limits of which the first determines the beginning of the monitoring interval and is dependent upon a threshold value. The second is determined by the end of the braking operation. A stepping relay is used as the indicating device by being actuated from a trigger circuit. A monostable multivibrator is included to increase the reliability of operation.
Inventors
- 👤 Heinz Thielen
- 👤 Harald Grundmann
- 👤 Franz Putz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:15
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103; F; F16; F16D; F16D66/00; G01P15/00; G01P15/16; G01P15/165
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
226 words
An arrangement for monitoring the condition of the mechanical brakes of an apparatus by measuring the braking time, comprising, in combination, movable means for moving at a speed proportional to the speed of the member that is braked; switch means having first and second states and operated to alternate between these states at a rate proportional to the speed of said movable means during movement of the latter; circuit means having a time constant and being connected to said switch means, said circuit means including current source means and current storage means connected to said current source means and to said switch means to be charged by the latter when said switch means is in said first state and to be discharged when said switch means is in said second state, said time constant being such that said current storage means discharges to a predetermined voltage when the speed of said movable means has fallen to a predetermined value during braking; threshold voltage pulse means connected to said current storage means for delivering pulses during a period of time beginning whenever said current storage means has discharged at least to said predetermined voltage and ending not later than when said movable means has stopped; and counting means connected to said threshold voltage pulse means for counting the number of said pulses during said period of time.
Claim 2
Dependent Claim
226 words
An arrangement for monitoring the condition of the mechanical brakes of an apparatus by measuring the braking time, comprising, in combination, movable means for moving at a speed proportional to the speed of the member that is braked; switch means having first and second states and operated to alternate between these states at a rate proportional to the speed of said movable means during movement of the latter; circuit means having a time constant and being connected to said switch means, said circuit means including current source means and current storage means connected to said current source means and to said switch means to be charged by the latter when said switch means is in said first state and to be discharged when said switch means is in said second state, said time constant being such that said current storage means discharges to a predetermined voltage when the speed of said movable means has fallen to a predetermined value during braking; threshold voltage pulse means connected to said current storage means for delivering pulses during a period of time beginning whenever said current storage means has discharged at least to said predetermined voltage and ending not later than when said movable means has stopped; and counting means connected to said threshold voltage pulse means for counting the number of said pulses during said period of time.
Claim 3
Dependent Claim
12 words
An arrangement as defined in claim 1, wherein said movable means rotates.
Claim 4
Dependent Claim
35 words
An arrangement as defined in claim 2, wherein said movable means includes permanent magnet means mounted on said movable means to rotate therewith, and further wherein said switch means is a magnetically operated switch means.
Claim 5
Dependent Claim
54 words
An arrangement as defined in claim 1, wherein said current storage means is a capacitor, and further including at least one first reactor connected between said capacitor and said current source means to enable said capacitor to charge; and at least one second resistor connected to said capacitor to permit the latter to discharge.
Claim 6
Dependent Claim
26 words
An arrangement as defined in claim 4, wherein at least one of the first and second resistors is adjustable to permit alteration of said time constant.
Claim 7
Dependent Claim
39 words
An arrangement as defined in claim 4, wherein said first resistor and said capacitor are connected in series with said current source means, and said second resistor and switch means are connected in series and shunted across said capacitor.
Claim 8
Dependent Claim
17 words
An arrangement as defined in claim 1, wherein said threshold voltage pulse means is a trigger stage.
Claim 9
Dependent Claim
34 words
An arrangement as defined in claim 7, wherein said trigger stage produces pulses of which the lengths are dependent on said rate at which said switch means alternates between said first and second states.
Claim 10
Dependent Claim
14 words
An arrangement as defined in claim 8, wherein said trigger stage produces rectangular pulses.
Claim 11
Dependent Claim
41 words
An arrangement as defined in claim 8, including a monostable multivibrator connected between said trigger stage and said counting means for ensuring dependable operation of the latter irrespective of the shape and length of said pulses produced by said trigger stage.
Claim 12
Dependent Claim
62 words
An arrangement as defined in claim 9, further including amplifying means for amplifying said rectangular pulses, said counting means including stepping relay means connected to said amplifying means and opErated by the amplified rectangular pulses, and said stepping relay means including contact means for indicating the positional state of said stepping relay means after actuation by said pulses from said amplifying means.
Claim 13
Dependent Claim
26 words
An arrangement as defined in claim 11, further including warning means connected to said contact means for giving warning when said pulses exceed a predetermined number.
Claim 14
Dependent Claim
28 words
An arrangement as defined in claim 11, further including switch off means for automatically turning off the driving means that causes movement of the member that is braked.
Claim 15
Dependent Claim
42 words
An arrangement as defined in claim 1, further including means for preventing delivery of said pulses to said pulse counting means at some time interval after said current storage means discharges to said predetermined voltage and before said movable means is stopped.
Claim 16
Dependent Claim
109 words
An arrangement as defined in claim 14, further including amplifier means connected between the output of said threshold voltage pulse means and said counting means, said means for preventing delivery of pulses being a monostable multivibrator means of which the input is connected to the output of said threshold voltage pulse means and of which the output is connected to said amplifier means so that said multivibrator means is switched to the unstable state thereof by the first pulse produced by said threshold voltage pulse means and the pulse produced by said multivibrator means when the latter switches back to the stable state thereof renders said amplifier means non-conductive.
References Cited (Backward Citations)
US3564532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |