| 摘要 |
A knob for installation on the end of a timer control shaft having a pair of flexible fingers. The knob includes a core, a hub in the core and a shaft receiving passage formed in the core. A shaft entrance of generally circular transverse cross section is formed on the timer side of the knob. A pair of arcuate ribs are formed in the passage inwardly of the entrance. A pair of diametrically located gaps are formed between the arcuate ribs. Shaft finger receiving channels are formed in the walls of the passage at the gaps with each channel having a base wall which tapers radially inwardly in an axial direction from the passage entrance to a constriction and then tapers radially outwardly in a farther axial direction away from the entrance. Corner projections are located at the constriction and extend axially of the constriction toward and away from the channel entrance. The shaft receiving passage may extend through the core or it may be a blind passage.
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