Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1987-05-21
1988-09-27
Echols, P. W.
Metal working
Method of mechanical manufacture
Assembling or joining
294322, 29436, 29DIG23, 29DIG48, B23P 1102
Patent
active
047731508
ABSTRACT:
A method of making a control assembly intended for use in manually regulating the operating speed of power equipment in which fine adjustments may be obtained by rotating the control knob and rapid changes in speed may be achieved by shifting the knob axially. The assembly includes an outer one-piece sleeve adapted to be mounted upon an instrument panel or engine housing and permanently joined to a flexible casing containing the operating wire or cable. A plunger assembly is rotatably and slidably received within the sleeve, the plunger assembly including a thin-walled plunger tube of flexible material having a control knob ultrasonically welded to one end of the plunger. The side wall of the plunger tube has a non-circular (preferably oval-shaped) opening through which a retractable follower (ball) protrudes for engaging the internal threads of the sleeve when vernier adjustment is desired. The width of the opening in one direction is slightly less than the diameter of the ball and, during assembly, the edges of the opening defining the reduced width flex inwardly as the ball is forceably inserted into the tube during assembly. Thereafter, the opening returns to its original shape and size to retain the ball within the tube.
REFERENCES:
patent: 1919455 (1933-07-01), Wilson
patent: 2720119 (1955-10-01), Sherman
patent: 3694958 (1972-10-01), Parker et al.
patent: 3762263 (1973-10-01), Bocceda
patent: 3824886 (1974-07-01), Hegler
patent: 4050327 (1977-09-01), Thomas et al.
Echols P. W.
Gorski Joseph M.
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