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The knob design has a built-in "end of travel" feel and permits push-on/pull off of a knob while insuring that the knob-retention device stays in position, thereby precluding possible shorting conditions.
English (United States)
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The knob design has a built-in "end of travel" feel and permits push-on/pull
off of a knob while insuring that the knob-retention device stays in position,
thereby precluding possible shorting conditions.
Knob 1 (Fig. 1) has a retainer 2 that is a stamped metal part made in the
form shown in Figs. 1 and 2. Retainer 2 is pushed into the knob in the
orientation shown in Fig. 1. Retainer 2 has grip fingers 3a-3d along each side
which serve several purposes. They are formed in a direction that, when
compressed in the knob slot 4, prevents the retainer from being pulled out of the
knob. The grip fingers also force the back side of retainer 2 against base 4a of
knob slot 4. This avoids tolerance build-up between the knob slot and the grip
fingers, and between spring 5 of retainer 2 and flat portion 6a of shaft 6. Spring 5
is formed along the horizontal center line of retainer 2. Its front portion 5a is
curved to provide a smooth lead onto shaft 6. When installed, spring 5 is
depressed and holds knob 1 onto shaft 6.
When knob 1 is turned to the end of its travel, spring 5 compresses until it
bottoms out against base 4a of knob slot 4. The extra force required for the last
segment of travel along with the spring back encountered, indicates that the end
of normal travel has been reached, which helps to prevent damage occurring
Retainer 2 has the front corners cut at an angle, as shown at 8, for ease of
assembly of retainer 2 into slot 4 in...