Patent ID: 8522403

Claim:
A button comprising: a button body; and a fixture for fixing the button body to a support from an opposite side to the button body with the support therebetween, wherein the button body includes a collar, a shaft protruding from the collar and an insert hole for the fixture to be inserted therein, wherein an outer circular wall and an inner circular wall are formed at a lower portion of the button body shaft separately from each other with a gap therebetween, wherein the outer circular wall defines an outer periphery of the shaft and at least one protrusion for fixing the support thereon is formed along the outer circular wall, wherein the inner circular wall defines an inner periphery of the insert hole, wherein the protrusion protrudes relative to the inner circular wall and the gap is recessed relative to the inner circular wall, wherein the insert hole comprises a first part having a first inner diameter, a top edge, and a bottom edge and a second part having a top edge, a bottom edge, and a second inner diameter that is smaller than the first inner diameter, wherein the first part extends from an upper portion of the button body and the second part extends from the bottom edge of the first part to the lower portion of the button body such that a cross section of the insert hole is stepwise increasing from the lower portion of the button body to the upper portion of the button body and such that the fixture is engaged with the button body at the first part of the insert hole, and wherein the gap extends from the lower portion of the button body and wherein a depth of the gap is smaller than an axial length of the second part such that the gap does not extend beyond the top edge of the second part.