Automatic nulling LVDT probe
AssigneeAcer Automation Company
InventorStephen S. Maples
Life of this patent
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Abstract
The invention pertains to a linear variable differential transformer (LVDT) probe utilizing a core mounting upon a sensing rod axially translatable with respect to a coil. The coil is movably supported for initially aligning the core and coil in a predetermined relationship to produce a desired electrical situation, such as a null condition, and the probe utilizes alignment means for quickly initially aligning the core and coil.
Claims12
A linear variable differential transformer probe comprising, in combination, a support member, first means mounted on said support member for supporting an elongated rod, an elongated rod supported on said first means for axial movement upon said support member, a sensing end and an LVDT core defined upon said rod, second means mounted on said support member for supporting an elongated LVDT coil for axial movement parallel to said rod axial movement upon said support member, an annular elongated LVDT coil mounted on said second means disposed about said LVDT core, and alignment means initially and temporarily being functionally interposed between said rod and coil to produce a known axial relationship between said rod and coil to produce a predetermined initial electrical condition.
A linear variable differential transformer probe comprising, in combination, a support member defining a bore having a first end and a second end, a bearing within said bore adjacent said first end, a rod within said bore slidably supported for axial movement by said bearing, said rod having a sensing end adapted to project from said bore first end, an LVDT core located within said bore, and a reference surface axially spaced from said sensing end, an LVDT coil within said bore surrounding said core, friction means frictionally axially positioning said coil within said bore, a coil reference surface fixed to said coil, and movable alignment means within said bore adapted to simultaneously engage said rod and coil reference surfaces to axially position said core and coil to a predetermined initial electrical condition relationship.
Dependencies are inferred from the claim text.