| 摘要 |
A press-in reversing knob for a ratchet wrench which has a self-contained retaining means. The reversing knob includes a generally cylindrical member having an annular flange at its upper end and resilient inwardly-deformable projections extending radially outward from its lower end. A cylindrical bore formed in the plug includes a coaxial annular retaining groove spaced downwardly from the top of the bore. As the reversing knob is pressed into the bore, the resilient projection is deformed inwardly by the walls of the bore until the projection engages the retaining groove and springs outwardly. The retaining groove retains the projection to prevent the reversing knob from becoming upwardly disengaged from the bore while accommodating rotational movement of the projection as the reversing knob is turned.
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