Geometrical instruments – Distance measuring – Error compensation
Reexamination Certificate
2007-03-20
2007-03-20
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Distance measuring
Error compensation
C033S503000
Reexamination Certificate
active
11294784
ABSTRACT:
A machine, such as a coordinate measuring machine, having a component or element movable with respect to a support structure along rails or guideways, wherein the rails have a coefficient of thermal expansion that is different from that of the support structure to which they are attached. Differential thermal expansion and contraction of the rails with respect to the support structure may be accommodated without binding or distortion of the rails by coupling each guideway to the support structure at two different points. Typically, the coupling at the first point is rigid and prevents any movement of the rail with respect to the support structure. The second coupling includes a flexible component that permits movement of the rail with respect to the support structure in a direction of movement of the element or component. This flexible component may be a leaf spring. In another embodiment, the first coupling may also be flexible. A method is also disclosed for accommodating differential thermal expansion and contraction of the rail with respect to the support structure by providing first and second couplings between the rail and support structure wherein at least the second coupling includes a flexible component that permits movement of the rail with respect to the support structure in a direction generally parallel to the direction of movement of the machine element.
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Hupkau Jens
Langlais John
Payette David W.
Weekers Wilhelmus Godefridus
Bennett G. Bradley
Hexagon Metrology AB
Wolf Greenfield & Sacks P.C.
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