Control knob locking assembly

A control knob assembly for mounting 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 shaft of said rotary control member;
• a mounting element having a first end including a threaded portion which is dimensioned to receive a conventional fastener, a non-cylindrical intermediate portion dimensioned to be matingly received within an opening in said panel, a second end including an enlarged cylindrical portion having external tapered threads having thread crests of increasing diameter, a mounting surface defined between said intermediate portion and threaded portion of said second end, and an axially aligned opening dimensioned to receive said control rod therethrough, said opening including a cylindrical portion dimensioned to slidably receive said cylindrical second portion of said control knob;
• and
• locking ring having internal tapered threads having thread roots of decreasing diameter dimensioned to operatively engage said external threads on said mounting element to compress and release said cylindrical second portion.

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 means associated with said second portion for attachment to a shaft of said rotary control member;
• a mounting element including means for mounting said element to said panel through an opening in said panel,
• a plurality of annularly arranged, flexible clamping elements, each having a threaded outer surface and a smooth inner surface, the inner surface of said clamping elements generally defining a smooth cylindrical bore which is dimensioned to receive said second portion of said control knob and the outer surfaces of said clamping elements defining a taper threaded surface having thread crests of increasing diameter,
• an 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 tapered threaded surface having thread roots of decreasing diameter 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 second portion of said control knob.