Instrument spindle with relief design
AssigneeDelco Electronics Corporation
InventorsDavid A. Ross, Arnold R. Eick
Life of this patent
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Abstract
A spindle for use in an instrumentation apparatus comprises, on an end of the spindle inserted into a cavity defined by a pointer shaft, (i) a surface for engagement to the pointer shaft and (ii) a recessed surface proximal to the engagement surface and inserted into the cavity without engaging the pointer shaft. The improved spindle is easily manufactured and reduces the maximum force required to stake the pointer shaft to the spindle.
Claims11
A spindle for use in an instrumentation apparatus comprising:
- on an end of the spindle inserted into a cavity defined by a pointer shaft, (i) a surface for engagement to the pointer shaft;
- and (ii) a recessed surface proximal to the engagement surface and inserted into the cavity without engaging the pointer shaft.
A substantially cylindrical spindle having a midpoint and first and second ends of which the first end is engaged with a pointer shaft, the improvement comprising:
- an engagement area at the first end of the spindle;
- and
- immediately proximal to the engagement area, between the first end and the mid-point, a recessed area that limits the force necessary to stake the pointer shaft to the spindle.
An instrumentation device spindle comprising:
- an elongated substantially cylindrical member with first and second ends and a mid-point, wherein the first and second ends are symmetrical about the mid-point such that each of the first and second ends defines:
- (i) a portion for rotatable mounting within a first bearing;
- (ii) a portion for friction engagement with a pointer shaft;
- (iii) a rotor mount portion to which a rotor may be mounted;
- and
- (iv) a portion between the rotor mount portion and the mid-point for rotatable mounting within a second bearing.
Dependencies are inferred from the claim text.