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1. An assembly of a knob and a lever comprising:
the knob including a substantially cylindrical hollow part formed in the knob, the hollow part extending downwardly through the knob to an opening in a bottom surface of the knob, the hollow part including a narrow portion and an accommodating groove formed in the knob, the accommodating groove having an inner diameter larger than an inner diameter of the narrow portion of the hollow part; the lever including a substantially cylindrical body part having a diameter corresponding to the inner diameter of the narrow portion of the hollow part, and a seating groove formed in the body part to have a diameter smaller than that of the body part, wherein the seating groove is formed in the body part at a position of the body part that faces the accommodating groove when the knob is assembled to the lever; and a multi-turn helical spring clip configured to be fitted onto the seating groove of the lever, having an inner diameter larger than the diameter of the seating groove and smaller than the diameter of the body part, and having an outer diameter larger than the diameter of the body part, wherein the spring clip is deformable in axial and radial directions, and wherein the outer diameter of the spring clip is compressed by the inner diameter of the narrow portion of the hollow part of the knob as the lever is fitted into the knob, thereby deforming the spring clip in the axial direction as well as in the radial direction, and the outer diameter of the spring clip expands into the accommodating groove of the knob when the lever is assembled to the knob, such that the spring clip is disposed in a space formed between the accommodating groove and the seating groove to provide a coupling force between the knob and the lever when the knob is assembled to the lever. |
