Measuring and testing – Dynamometers – Responsive to torque
Reexamination Certificate
1999-07-15
2001-10-09
Fuller, Benjamin R. (Department: 2855)
Measuring and testing
Dynamometers
Responsive to torque
Reexamination Certificate
active
06298736
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for measuring a torque between two coaxial shafts.
2. Summary of the Prior Art
Devices for measuring a force acting between two solid bodies conventionally comprise a resilient non-rigid element which interconnects the bodies and which therefore undergoes considerable deformation in response to a force acting between them. After the device has been calibrated, measurement of the deformation enables the applied force to be determined. Various procedures are possible but one of the commonest is to stick strain gauges to the connecting element and to measure the variation in the resistance of conductors which are embedded in the gauge, the resistance varying as a function of the deformation.
These devices can be employed in many different ways, but the present invention is concerned with a device for measuring a torque between two coaxial shafts which combines the advantages of simplicity, ruggedness and compactness with sensitivity, accuracy and a very rapid transient response giving substantially instantaneous recording of any variation in torque.
SUMMARY OF THE INVENTION
Accordingly, the invention provides a device for measuring a torque between coaxial first and second shafts, comprising:
an axially split ring rigidly connected to said first shaft and defining an axial slot;
an axial key on said second shaft and received in said axial slot;
said ring having a main part and at least one tail which borders said axial slot and is separated from said first shaft;
said at least one tail comprising an end portion having a key-contacting surface, and a thin portion connecting said end portion to said main part of said ring, said thin portion extending in an axial or obliquely axial direction and having a surface defined by the thickness of said ring; and
a strain gauge carried by said thin portion on said surface defined by the thickness of said ring.
Further preferred features and advantages of the invention will become apparent from the following description of a preferred embodiment, given by way of example only and with reference to the accompanying drawings.
REFERENCES:
patent: 4754652 (1988-07-01), Coulter et al.
patent: 5524485 (1996-06-01), Bernard et al.
patent: 5905212 (1999-05-01), Moses et al.
patent: 196 50 477 (1998-04-01), None
patent: 652 424 (1995-05-01), None
Girard Francis
Linet Hugues Henri Raymond
Fuller Benjamin R.
Hispano Suiza
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Thompson Jewel V.
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