Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Reexamination Certificate
1999-07-12
2001-04-17
Noori, Max (Department: 2858)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
C073S862392
Reexamination Certificate
active
06216542
ABSTRACT:
The present invention relates to force sensors with internal parallel motion and a measuring transducer, which generates a digital signal from the force to be measured, or one derived from it by reduction. Some such force sensors are known, as for instance from EP 0 325 619 (D
1
) and EP 0 544 858 (D
2
). Furthermore, cord measuring transducers are known, for instance from EP 0 540 474 (D
3
).
The force sensors known from D
1
and D
2
are both suitable as surface loading measurement devices, since internal parallel motions are present. An elastic force reduction is a component of the force sensors in both cases. In both cases, however, the measurement transducers are built into the force sensors as separate elements with in part expensive and sensitive force transmission elements. Moisture and gas tight production of the measurement transducers used in D
1
and D
2
, however, throw up technical problems, since as a general rule such versions are of relatively large construction and bring further force reductions with them. Further, from EP 319 176 a sealed version of a wobble pin is known, with integrated measurement electronics.
In any case, a wobble pin is basically constructed for point loading and cannot be immediately converted for surface loading.
The aim, which is to be addressed by the present invention, comprises producing a small size surface loading force sensor with integral parallel motion and force reduction in a moisture and gas tight construction. The addressing of the aim is reproduced in claim
1
with regard to its essential characteristics, in claims
2
to
17
regarding further advantageous versions.
REFERENCES:
patent: 4079624 (1978-03-01), Kurtz
patent: 4103758 (1978-08-01), Trulio et al.
patent: 4409789 (1983-10-01), Hansen et al.
patent: 5053703 (1991-10-01), Fischer
patent: 5259253 (1993-11-01), Wirth
patent: 5379653 (1995-01-01), Saner
patent: 5408894 (1995-04-01), Henson
patent: 5496973 (1996-03-01), Wirth
patent: 5501177 (1996-03-01), Edstrom, Sr. et al.
patent: 071 652 (1981-08-01), None
patent: 248 226 (1987-05-01), None
patent: 325 619 (1988-03-01), None
patent: 319 176 (1988-11-01), None
patent: 544 858 (1992-06-01), None
patent: 540 474 (1992-10-01), None
Saner Kaspar
Stöckli Roland
K-Tron Technologies Inc.
Noori Max
Ratner & Prestia
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