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Wedge lock knob assembly

  • US 4,132,129 A
  • Filed: 06/03/1977
  • Issued: 01/02/1979
  • Est. Priority Date: 06/03/1977
  • Status: Expired due to Term
First Claim
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1. A control knob assembly for mounting on an end portion of a rotatable shaft and comprising:

  • a tubular hub disposed to encircle the end portion of the shaft and having first interlocking means for transmitting rotational movement to the shaft, the hub also being provided with longitudinally sloped means for preventing rotational movement of the shaft;

    a nonrotatable member disposed adjacent the hub and having arcuate surface means disposed in spaced coaxial relationship with the sloped means of the hub for locking the shaft in a preselected angular position;

    wedge-shaped binding means longitudinally disposed between the sloped means of the hub and the arcuate surface means of the nonrotatable member for axially releasable binding engagement therewith;

    a cup-shaped knob shell coaxially disposed with respect to the hub and the nonrotatable member, the shell having releasing means for disengaging the binding means and having second interlocking means for transmitting rotational movement to the shaft; and

    spring means disposed between the hub and the shell for resiliently positioning the shell in predetermined relationship with the hub and the binding means.

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