US3724138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding resistance detecting device
Assignee: Toyoda Koki KK
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Filing: 1971-09-29
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Granted: 1973-04-03
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Expires: 1991-09-29
Abstract
Abstract A grinding resistance detecting device includes a strain sensitive transducer having semiconductor strain gauges for generating an output voltage level proportional to a grinding resistance. A contact is connected to the strain sensitive transducer and is closed at a non-grinding period. A memory circuit is connected to the contact for storing a drift voltage level of the strain sensitive transducer and a differential-input amplifier is connected to the strain sensitive transducer and to the memory circuit for providing a voltage which is purely proportional to the grinding resistance.
Inventors
- 👤 M Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:18
CPC Classifications
B; B23; B23Q; B23Q15/00; B23Q15/007; B23Q15/12; B24; B24B; B24B49/00; B24B49/16; B24B49/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A grinding resistance detecting device comprising: strain sensitive transducer means having semiconductor strain gauge means therein, said strain sensitive transducer means having a deformable part thereof which is deformed in accordance with a grinding resistance exerted on a grinding wheel of a grinding machine and for generating an output voltage level proportional to said grinding resistance; a contact connected to said strain sensitive transducer means, said contact being closed at a non-grinding period; a memory circuit connected to said contact for storing the drift voltage level of said strain sensitive means; and, a differential-input amplifier connected to said strain sensitive transducer means and said memory circuit.
Claim 2
Dependent Claim
106 words
A grinding resistance detecting device comprising: strain sensitive transducer means having semiconductor strain gauge means therein, said strain sensitive transducer means having a deformable part thereof which is deformed in accordance with a grinding resistance exerted on a grinding wheel of a grinding machine and for generating an output voltage level proportional to said grinding resistance; a contact connected to said strain sensitive transducer means, said contact being closed at a non-grinding period; a memory circuit connected to said contact for storing the drift voltage level of said strain sensitive means; and, a differential-input amplifier connected to said strain sensitive transducer means and said memory circuit.
Claim 3
Dependent Claim
88 words
A grinding resistance detecting device as set forth in claim 1, wherein: said memory circuit includes a field-effect-transistor, the gate terminal of said field-effect-transistor being connected to said contact, the drain terminal of said field-effect-transistor being supplied with a source of voltage, and the source terminal of said field-effect-transistor being grounded by way of a resistance and being further connected to said differential-input amplifier; and, said memory circuit further includes a condenser, one electrode of which is connected to said gate terminal and the other electrode being grounded.
Claim 4
Dependent Claim
62 words
A grinding resistance detecting device as set forth in claim 2, wherein is further included a second field-effect-transistor, the gate terminal of said second field-effect-transistor being coupled to said strain sensitive transducer means, the drain terminal thereof being supplied with a voltage, and the source terminal thereof being grounded by way of a resistance and being further connected to said differential-input amplifier.
Claim 5
Dependent Claim
107 words
A grinding resistance detecting device comprising: pressure sensitive transducer means having semiconductor strain gauge means connected in a bridge circuit, said pressure sensitive transducer means being connected with a fluid bearing for supporting a spindle having a grinding wheel and for generating an output voltage level proportional to a grinding resistance exerted on said grinding wheel; a contact connected to said pressure sensitive transducer means, said contact being closed during a non-grinding period; a memory circuit connected to said contact for storing the drift voltage level of said pressure sensitive transducer means; and, a differential-input amplifier connected to said pressure sensitive transducer means and said memory circuit.
Claim 6
Dependent Claim
107 words
A grinding resistance detecting device comprising: pressure sensitive transducer means having semiconductor strain gauge means connected in a bridge circuit, said pressure sensitive transducer means being connected with a fluid bearing for supporting a spindle having a grinding wheel and for generating an output voltage level proportional to a grinding resistance exerted on said grinding wheel; a contact connected to said pressure sensitive transducer means, said contact being closed during a non-grinding period; a memory circuit connected to said contact for storing the drift voltage level of said pressure sensitive transducer means; and, a differential-input amplifier connected to said pressure sensitive transducer means and said memory circuit.
Claim 7
Dependent Claim
48 words
A grinding resistance detecting device as set forth in claim 4, wherein said pressure sensitive transducer means is connected to forward and rear cavities of said fluid bearing and will convert the difference between pressure levels generated in said forward and rear cavities into a corresponding voltage level.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |