Measuring machine of the portal variety

Details Measuring machine of the portal variety Measuring machine of the portal variety

1982-12-01

1984-08-21

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

33 1M, G01B 500

Patent

active

044661959

ABSTRACT:
The invention contemplates a measuring machine wherein a portal (2) is displaceable on a flat base plate (1) of granite. The bridge portion (3) of the portal (2) includes a guide rail (22) which is centrally fixed to the bridge portion (3) and extends in the x-direction of portal displacement. A separate superstructure (23) fixed to and upstanding from the base plate (1) provides support and guidance for the guide rail (22). In a manually operated embodiment, the operating knob for the use is arranged on a carriage which is displaceable along the bridge portion (3), in the y-direction.
Since points relevant to displacement force application (e.g., drive, center of gravity, guidance) are at approximately the same elevation, bending forces can introduce essentially only two kinds of error, namely, a lateral offset (.DELTA.Y) of the portal and/or an incremental rotation of the portal about the vertical (z). The invention provides for detection of these errors via a measuring device (30, 35), coacting between a leg (4) of the portal (2) and a reference lateral alignment (34) of portal-leg displacement in the x-direction. And the detected errors are then included by calculation in the measurement result determined by the machine.

REFERENCES:
patent: 3749501 (1933-07-01), Wieg
patent: 3831283 (1974-08-01), Pagella
patent: 3840993 (1974-10-01), Shelton

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