Length measuring system

Details Length measuring system Length measuring system

1992-03-20

1994-01-18

Will, Thomas B.

Geometrical instruments

Distance measuring

Error compensation

33704, 33DIG19, G01B 2102

Patent

active

052790436

ABSTRACT:
A length measuring system comprises an elongate scale member adapted to be scanned for generating measured-length signals, a tubular scale member carrier defining an internal cavity housing the scale member and including a mounting wall, a connection of the scale member to the scale member carrier, the connection permitting a longitudinal movement of the scale member relative to the scale member carrier, and end blocks rigidly connected to the scale member carrier at both ends thereof, the end blocks defining recesses and having opposite sides. Devices are provided in the recesses of the end blocks for fastening the scale member carrier to an object and for compensating for length differences resulting from a differential thermal expansion of the scale member carrier and the object, the devices including an intermediate part having two ends and defining a through hole between the ends for receiving a fastening element for fastening the end blocks to the object, and webs having one end connected to the ends of the intermediate part and extending transversely to the longitudinal direction, the webs defining at least along a major portion of their length a clearance with the fastening element and adjacent surfaces of the recess, and an opposite end of the webs connected to the end blocks, the webs having a relatively small flexural stiffness in the longitudinal direction and a relatively high flexural stiffness in a direction extending transversely to the longitudinal direction.

REFERENCES:
patent: 3816002 (1974-06-01), Wieg
patent: 4320578 (1982-03-01), Ernst
patent: 4477726 (1984-10-01), Reichi
patent: 4479304 (1984-10-01), Nelle
patent: 4530157 (1985-07-01), Nelle
patent: 4569137 (1986-02-01), Ichikawa
patent: 4776098 (1988-10-01), Nelle
patent: 5016359 (1991-05-01), Nagaoka et al.

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