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Control knob locking assembly

  • US 5,083,477 A
  • Filed: 01/31/1991
  • Issued: 01/28/1992
  • Est. Priority Date: 01/31/1991
  • Status: Expired due to Fees
First Claim
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1. A control knob assembly to be mounted to a panel for use with an adjustable rotary control device of the type having a push and/or pull function comprising:

  • a control knob having a first portion dimensioned to be grasped by a user, a second portion which is cylindrical in shape and extends from said first portion and a bore extending into said cylindrical second portion aligned along the axis of said cylindrical second portion, said bore dimensioned to receive a shaft of said rotary control member;

    a mounting element adapted to be mounted to said panel through a non-cylindrical opening in said panel, said mounting element having;

    a first end including a plurality of annularly arranged, flexible clamping elements, each having a threaded outer surface and a smooth inner surface, the inner surfaces of said clamping elements generally defining a smooth cylindrical bore which is dimensioned to receive said cylindrical second portion of said control knob and the outer surfaces of said clamping elements defining a thread surface having an increasing taper of approximately 10°

    ,a second end of smaller diameter than said first end, having a threaded portion which is dimensioned to receive a conventional fastener,a non-cylindrical intermediate portion between said first end and said second end, said intermediate portion dimensioned to be matingly received within said non-cylindrical opening in said panel, andan axial opening communicating with said bore dimensioned to receive said shaft of said rotary control member; and

    a locking ring dimensioned to be circumferentially mounted on said clamping elements, said locking ring including an internal threaded surface having a decreasing taper of approximately 10°

    dimensioned to matingly engage said outer threaded surfaces of said clamping elements wherein said locking ring is operable to releasably compress said clamping elements into engagement with said cylindrical second portion of said control knob.

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