Instrument for measuring lengths or angles

Geometrical instruments – Distance measuring – Single contact with a work engaging support

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Details

33833, G01B 702

Patent

active

059375337

ABSTRACT:
A measuring instrument comprises a column (10) on which is mounted a carriage (11) with a drive cursor (12) and a measuring cursor (20) sliding on the drive cursor (12) and carrying a measuring contact (24) and a measuring device (40). A measuring force device (25) is arranged between the two cursors and determines, thanks to a lever (26) a rest position and two measuring positions vertically upwardly or downwardly offset or corresponding to a predetermined measuring force on the member to be measured. A motor (15) displaces the drive cursor (12) and the position detector (36) permits measuring the relative position between the two cursors. A control unit (35) controls the speed and direction of rotation of the motor (15) as a function either of the signals (44) received from the position detector (36) or from two external contacts (42, 43). The carriage (11) is first displaced by means of the external contacts (42, 43) and as soon as the lag between the two cursors reaches an upper or lower limit, the control of the motor is effected as a function of the signals received from the position detector (36). There is thus obtained a double subjection of the speed of movement of the carriage and of the measuring force, permitting very precise and rapid measurements and rendering easy the measurement of profiles.

REFERENCES:
patent: 4841225 (1989-06-01), Meyer
patent: 4845855 (1989-07-01), Meyer
patent: 4924598 (1990-05-01), Gruhler
patent: 5040308 (1991-08-01), Meyer
patent: 5373645 (1994-12-01), Bezinge et al.

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