Geometrical instruments – Distance measuring – Opposed contacts
Reexamination Certificate
1998-10-23
2001-08-14
Fulton, Christopher W. (Department: 2859)
Geometrical instruments
Distance measuring
Opposed contacts
C033S706000
Reexamination Certificate
active
06272766
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a length measuring instrument for measuring the relative position of two objects and, more particularly, to a machine with a length measuring instrument that has a scale rotatably supported by a pivot bearing and a scanner device guided on the scale so that rotations of the scanner device are transmitted to the scale.
BACKGROUND OF THE INVENTION
German Patent Publication No. DE 25 05 587 C3 discloses a length measuring instrument in which a scale is secured by an angle bracket to one of the objects to be measured and a scanner device is secured to the second object by a mounting foot. The angle bracket has a weak point in the form of a groove. The angle bracket allows a rotary motion of the scale about an axis at right angles to the measurement direction. To compensate for inaccuracies of guidance, a coupling is provided between the mounting foot and the scanner device. The scanner device is guided on the scale.
German Patent Publication No. DE 31 13 962 A1 discloses a length measuring instrument that is rotatably supported about its longitudinal axis while it is being mounted. During measurement operation, rotatability is precluded since the ends are fixed in the final mounted position.
International Patent Application WO 91/03145 A1 describes a machine, such as a hexapod having telescoping arms. The relative location of two machine parts can be varied by the plurality of telescoping arms. The relative location can be determined by the instantaneous length of the telescoping arms. To that end, one length measuring instrument is provided in each telescoping arm. It comprises a rodlike round scale and a scanner unit.
SUMMARY OF THE INVENTION
An object of the invention is to provide a length measuring instrument with which the spacing between two parts can be measured in a simple way, the two parts being capable of rotating relative to one another about the measurement axis during operation.
Advantages attained with the invention are, in particular, a stable design, high measuring accuracy, and thermally favorable behavior.
An object of the invention is also to disclose a machine having at least one telescoping arm between two machine bodies in which the pulled-out length of the telescoping arm can be measured with a compact, high-precision length measuring instrument.
REFERENCES:
patent: 4988244 (1991-01-01), Sheldon et al.
patent: 5354158 (1994-10-01), Sheldon et al.
patent: 5758427 (1998-06-01), Feichtinger et al.
patent: 25 05 587 (1977-10-01), None
patent: 31 13 962 (1982-10-01), None
patent: 0 762 082 (1995-12-01), None
patent: WO 91/03145 (1991-03-01), None
Falkinger Bernhard
Tondorf Sebastian
Brinks Hofer Gilson & Lione
Fulton Christopher W.
Johannes Heidenhain GmbH
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