US4117451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting variation of a condition amount in a mechanical device
Assignee: Toyota Motor Corp
•
Filing: 1976-08-10
•
Granted: 1978-09-26
•
Expires: 1996-08-10
Abstract
Abstract An apparatus for detecting variation of a condition in a mechanical device comprises a detecting transformer or plurality of such transformers provided with an input winding, a control winding and an output winding, an A. C. power source connected to said input winding, and a detecting element connected in series with said control winding. The normally closed detecting element is adapted to become open circuited in response to variation of the condition amount in said mechanical device. A required output signal is taken out and detected by an output circuit from the output winding due to the open circuiting of the detecting element.
Inventors
- 👤 Kazuo Sato
- 👤 Haruhiko Toriyama
- 👤 Seiichi Matsushige
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:08
CPC Classifications
G; G08; G08B; G08B23/00; B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408; B60C23/0422; B60K; B60K15/00; B60K15/03; B60K15/06; B60K15/061; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/225; F; F16; F16D; F16D66/00; F16D66/02; F16D66/021; F16D66/028
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
An apparatus for detecting variation of a condition amount in a mechanical device comprising at least one detecting transformer having an input winding, at least one control winding, and an output winding mounted in a single magnetic path, an alternating current power source connected to said input winding, at least one normally closed circuit detecting element means to detect a variation of a condition amount by opening of said normally closed circuit detecting element means connected between one of two ends of said control winding and ground, and the other of said ends of said control winding connected to ground, and output means connected to said output winding to take out an output signal occurring on said output winding when said normally closed circuit detecting element means is open circuited.
Claim 2
Independent Claim
130 words
An apparatus for detecting variation of a condition amount in a mechanical device comprising at least one detecting transformer having an input winding, at least one control winding, and an output winding mounted in a single magnetic path, an alternating current power source connected to said input winding, at least one normally closed circuit detecting element means to detect a variation of a condition amount by opening of said normally closed circuit detecting element means connected between one of two ends of said control winding and ground, and the other of said ends of said control winding connected to ground, and output means connected to said output winding to take out an output signal occurring on said output winding when said normally closed circuit detecting element means is open circuited.
Claim 3
Dependent Claim
26 words
The apparatus of claim 1, further characterized by said input winding, said at least one control winding, and said output winding mounted on a single core.
Claim 4
Dependent Claim
87 words
The apparatus of claim 1, further characterized by said output means including a diode having a input and an output with said input connected to said output winding, a smoothing circuit having an input and an output with said input of said smoothing circuit connected to said output of said diode, an amplifying circuit connected to said output of said smoothing circuit, and an alarm means connected to said amplifying circuit and driven thereby to be actuated by opening of said normally closed circuit detecting element means.
Claim 5
Dependent Claim
71 words
The apparatus of claim 1, further characterized by said detecting element means including a metal plate of abradable metal buried in a supporting plate and a friction member of a brake device with said metal plate located to extend into said friction member to be eroded along with adjacent portions of said friction member, and lead lines connected to said metal plate and to said control winding and said respective ground.
Claim 6
Dependent Claim
23 words
The apparatus of claim 4, further characterized by said metal plate positioned in a cavity in said supporting plate and said friction member.
Claim 7
Dependent Claim
20 words
The apparatus of claim 4, further characterized by said metal plate embedded in said supporting plate and said friction member.
Claim 8
Independent Claim
150 words
An apparatus for detecting variation of condition amounts in a mechanical device comprising a plurality of detecting transformers, each having an input winding, at least one control winding, and an output winding mounted in a single magnetic path, an alternating current power source commonly connected to said input winding of each of said plurality of detecting tranformers, a plurality of normally closed circuit detecting element means to each detect a variation of a condition amount by opening of said normally closed circuit detecting element means with each detecting element means connected in series with and between a respective one of said control windings and ground, and the other of said ends of each of said control windings connected to ground, an output means connected to said output windings to take out an output signal occurring on said output windings when said normally closed circuit detecting element means is open circuited.
Claim 9
Independent Claim
150 words
An apparatus for detecting variation of condition amounts in a mechanical device comprising a plurality of detecting transformers, each having an input winding, at least one control winding, and an output winding mounted in a single magnetic path, an alternating current power source commonly connected to said input winding of each of said plurality of detecting tranformers, a plurality of normally closed circuit detecting element means to each detect a variation of a condition amount by opening of said normally closed circuit detecting element means with each detecting element means connected in series with and between a respective one of said control windings and ground, and the other of said ends of each of said control windings connected to ground, an output means connected to said output windings to take out an output signal occurring on said output windings when said normally closed circuit detecting element means is open circuited.
Claim 10
Dependent Claim
24 words
The apparatus of claim 7, further characterized by said output windings of said plurality of detecting transformers being connected in series with each other.
References Cited (Backward Citations)
US2719288A
Cited
US3143729A
Cited
US3183498A
Cited
US3374470A
Cited
US3603926A
Cited
US3556258A
Cited
US3602884A
Cited
US3646293A
Cited
US3674114A
Cited
US3694803A
Cited
US3858174A
Cited
US3995262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |