Leeds & Northrup Company

Curtis Robert Johnson

Albert E Paschkis

Samuel Jordan Harkins

A press fit sleeve bearing member supported in a bearing support in which the support portion of the bearing member is of limited length along the longitudinal dimension of the bearing member. The bearing zone is isolated from the support zone by a transition zone to isolate the bearing zone from dimensional changes due to distortions created by the press fit.

Press fit bearing retaining bearing size when inserted into support

A hot stylus using a mandrel of soft material having good heat conductivity and good electrical conductivity is used to carry heat to the writing end of the mandrel. That end fits in an aperture of a jewel bearing surface which rides on the heat sensitive paper. The mandrel is soldered in a groove along a thermistor having a positive temperature coefficient. The mandrel also provides one electrical connection to the thermistor. The other electrical connection is by way of a foil contact soldered to an opposite face of the thermistor. That assembly is potted and assembled on a circuit board which provides the electrical leads from the stylus body to which the foil is soldered and from the mandrel itself.

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Flourtown, PA, United States of America

Curtis Robert Johnson