US 4,109,607 AGranted

Reference index for instrument dials

OwnerCharles D. Summersinventor

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Abstract

A reference index is provided for dial type instruments and includes an indicator selectively positioned on the face of the instrument for operation in either of two functional modes. The reference index includes a mounting pivot which is adapted to be secured to the face of the instrument and carries a mounting block that is relatively rotatable about a pivot axis projecting from the face of the instrument dial. Carried by the mounting block is an indicator having an elongated arm which has one end pivoted in the mounting block for relative rotational movement in a plane parallel to the face of the instrument, or perpendicular to the pivot axis. Formed with the outer end of the arm are first and second reference tabs which are adapted to overlie the circular indicia ring of the instrument. The two tabs are perpendicularly disposed to each other and project transversely to the longitudinal axis of the arm. The arm may be revolved about the mounting pivot axis to place the reference tab at a desired angular position and the particular tab desired, through rotation about the longitudinal axis of the arm, is placed in parallel relationship to the face of the instrument dial for utilization of the selected tab in forming an index with respect to that dial face.

Claims17

Dependent claims

A reference index for dial-type instruments with a face having a circular indicia ring comprising

a mounting pivot including a base plate and an elongated pivot pin having a longitudinally extending pivot pin axis, said pivot pin secured to said base plate in perpendicular relationship thereto, said base plate adapted to be rigidly affixed to the face of the instrument in coaxially positioning the pivot pin relative to the indicia ring for projection outwardly from the instrument's face,
a mounting block positionable on said mounting pivot in retained relationship and selectively revolvable about said pivot pin axis,
an indicator carried by said mounting block for revolution therewith in a plane perpendicular to said pivot pin axis, said indicator having an elongated arm projecting ransversely to said pivot pin axis for movement in the plane of revolution and an indicator index carried by said arm at a position radially outward from the pivot pin axis so as to be in cooperative indicating relationship to the indicia ring when said mounting pivot is affixed to the instrument, said elongated arm having an end journalled in said mounting block to enable revolution of the arm about a longitudinally extending axis of the arm, said indicator index including at least one reference tab of plate form extending transversely to said arm, said tab positionable in either parallel or perpendicular relationship to the instrument's face in accordance with selective revolution of said arm about its longitudinally extending axis.

Dependencies are inferred from the claim text.