Supports – Pipe or cable – Extending through plate
Patent
1985-05-09
1987-08-25
Petrakes, John
Supports
Pipe or cable
Extending through plate
2482184, 2482191, 2484751, 248476, 248DIG1, 350253, 350616, 350632, 350639, G02B 718, G02B 508
Patent
active
046889094
ABSTRACT:
A thermally compensating positioning device for use in maintaining an object, e.g., an optical mirror, in a precisely fixed position throughout ambient temperature fluctuations comprises an elongated first columnar member, e.g., a bar, and an elongated second columnar member, e.g., another bar, formed of material that has a coefficient of thermal expansion higher than that of the first columnar member. The first and second members are connected together in a manner that the second member is restrained against movement by the first member along its longitudinal axis and the second member is structured to flex away from or toward the first member when the ambient temperature rises above or falls below a datum temperature.
In a preferred embodiment, lugs integral with the ends of the second member connect it in yoke manner to the ends of the first member and the second member has a slot in its midsection to provide for midsection flexing with temperature variations.
In thermally compensated assemblies comprising the new positioning devices, a longitudinal side of one of the members (bars) contacts the mirror or other object to assist in maintaining such object in a fixed precise position. The new positioning devices function by expanding or contracting laterally at a rate several time greater than the housing or other support in or upon which the object is mounted so the devices can keep a controlled gap between the object and such housing as the housing expands or contracts with temperature change.
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Palmer Carroll F.
Petrakes John
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