US3939703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring engine cylinder pressures
Assignee: National Research Council Canada
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Filing: 1974-09-16
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Granted: 1976-02-24
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Expires: 1994-09-16
Abstract
Abstract Apparatus for measuring engine cylinder pressures having an arcuate metal strip, means for mounting the strip at one end to the engine block and at the other to the engine head such that the strip spans the engine head gasket and strains in the gasket cause bowing of the metal strip, and a transducer mounted on the strip for measuring the amount of bowing of the strip and providing an output signal related to this. A preferred means for mounting the strip is metal dowels attached to the end of the strip and rigidly mounted in openings in the cylinder head and block and the preferred transducer comprises a pair of resistance element strain gauges mounted on the inside and the outside of the arcuate portion of the metal strip.
Inventors
- 👤 William S. Heggie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:30
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/08; G01L23/18; F; F02; F02F; F02F7/00; F02F7/006; F02F2007/0063
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
Apparatus for measuring engine cylinder pressures comprising: a. an arcuate metal strip, b. a pair of metal dowels attached to the ends of the strip, one of said dowels rigidly mounted in an opening in the cylinder block and the other rigidly mounted in an opening in the cylinder head, and c. a transducer mounted on the strip for measuring the amount of bowing of the strip and providing an output signal related to this.
Claim 2
Dependent Claim
75 words
Apparatus for measuring engine cylinder pressures comprising: a. an arcuate metal strip, b. a pair of metal dowels attached to the ends of the strip, one of said dowels rigidly mounted in an opening in the cylinder block and the other rigidly mounted in an opening in the cylinder head, and c. a transducer mounted on the strip for measuring the amount of bowing of the strip and providing an output signal related to this.
Claim 3
Dependent Claim
106 words
Apparatus for measuring engine cylinder pressures comprising: a. an arcuate metal strip, b. means for mounting the strip at one end to the engine block and at the other to the engine head such that the strip spans the engine head gasket and strains in the gasket cause bowing of the metal strip, and c. a pair of resistance element strain gauges one mounted on the inside and the other on the outside of the arcuate or bowed portion of the metal strip and connected together and to the output as to give a strong electrical output related to the amount of bowing of the strip.
Claim 4
Dependent Claim
106 words
Apparatus for measuring engine cylinder pressures comprising: a. an arcuate metal strip, b. means for mounting the strip at one end to the engine block and at the other to the engine head such that the strip spans the engine head gasket and strains in the gasket cause bowing of the metal strip, and c. a pair of resistance element strain gauges one mounted on the inside and the other on the outside of the arcuate or bowed portion of the metal strip and connected together and to the output as to give a strong electrical output related to the amount of bowing of the strip.
Claim 5
Dependent Claim
102 words
Apparatus for measuring engine cylinder pressures comprising: a. an arcuate metal strip, b. means for mounting the strip at one end to the engine block and at the other to the engine head such that the strip spans the engine head gasket and strains in the gasket cause bowing of the metal strip, c. a transducer mounted on the strip for measuring the amount of bowing of the strip and providing an output signal related to this, and d. encapsulation material covering the strip and the transducer providing a protective housing and damping action to the strip and the transducer mounted thereon.
Claim 6
Dependent Claim
102 words
Apparatus for measuring engine cylinder pressures comprising: a. an arcuate metal strip, b. means for mounting the strip at one end to the engine block and at the other to the engine head such that the strip spans the engine head gasket and strains in the gasket cause bowing of the metal strip, c. a transducer mounted on the strip for measuring the amount of bowing of the strip and providing an output signal related to this, and d. encapsulation material covering the strip and the transducer providing a protective housing and damping action to the strip and the transducer mounted thereon.
References Cited (Backward Citations)
US2569949A
Cited
US3690162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |