US4258565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force detector
Assignee: Yokogawa Electric Corp
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Filing: 1979-06-29
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Granted: 1981-03-31
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Expires: 1999-06-29
Abstract
Abstract A force detector for detecting a force directly as a stress is disclosed which includes a piezoelectric unit for detecting a stress, a vessel for housing the piezoelectric unit, and a seal member for sealing the piezoelectric unit firmly and integrally in the vessel.
Inventors
- 👤 Takehiro Sawayama
- 👤 Ichizo Ito
- 👤 Toshio Aga
- 👤 Tetsuo Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:11
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/32; G01F1/325; G01F1/3259; G01F1/3266; G01L; G01L1/00; G01L1/16; G01L9/00; G01L9/0001; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01P15/0907; Y; Y10; Y10S; Y10S73/00; Y10S73/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A force detector for detecting a force directly as a stress comprising: a columnar pressure receiving member; a container vessel secured to one end of the columnar pressure receiving member; a pair of piezoelectric elements in said vessel and positioned opposite to each other about the center axis of the pressure receiving member so that the piezoelectric elements receive differential stresses produced in the vessel by said pressure receiving member; and securing means comprising inelastic material engaging said piezoelectric elements for firmly securing and sealing said elements inside said vessel to provide that said elements are effectively integral with said vessel; said pair of piezoelectric elements serving to directly detect a force to be measured applied to said columnar pressure receiving member, and to convert said force into an electric output signal.
Claim 2
Dependent Claim
132 words
A force detector for detecting a force directly as a stress comprising: a columnar pressure receiving member; a container vessel secured to one end of the columnar pressure receiving member; a pair of piezoelectric elements in said vessel and positioned opposite to each other about the center axis of the pressure receiving member so that the piezoelectric elements receive differential stresses produced in the vessel by said pressure receiving member; and securing means comprising inelastic material engaging said piezoelectric elements for firmly securing and sealing said elements inside said vessel to provide that said elements are effectively integral with said vessel; said pair of piezoelectric elements serving to directly detect a force to be measured applied to said columnar pressure receiving member, and to convert said force into an electric output signal.
Claim 3
Dependent Claim
16 words
The force detector as defined in claim 1, wherein said securing means comprises a glass compound.
Claim 4
Dependent Claim
129 words
A force detector for detecting a force directly as a stress comprising: a columnar pressure receiving member; a container vessel secured to one end of the columnar pressure receiving member; a piezoelectric element in said vessel; securing means comprising inelastic material engaging said piezoelectric element for firmly securing and sealing said piezoelectric element inside the vessel to provide that said piezoelectric element is effectively integral with said vessel; said piezoelectric element being disposed in the vessel to be positioned so that the center axis of the piezoelectric element is in alignment with the center axis of the pressure receiving member; and said piezoelectric element comprising at least two sets of electrodes disposed symmetrically with respect to said center axis of the piezoelectric element and coupled to each other differentially.
Claim 5
Dependent Claim
129 words
A force detector for detecting a force directly as a stress comprising: a columnar pressure receiving member; a container vessel secured to one end of the columnar pressure receiving member; a piezoelectric element in said vessel; securing means comprising inelastic material engaging said piezoelectric element for firmly securing and sealing said piezoelectric element inside the vessel to provide that said piezoelectric element is effectively integral with said vessel; said piezoelectric element being disposed in the vessel to be positioned so that the center axis of the piezoelectric element is in alignment with the center axis of the pressure receiving member; and said piezoelectric element comprising at least two sets of electrodes disposed symmetrically with respect to said center axis of the piezoelectric element and coupled to each other differentially.
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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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |