| 摘要 |
A button device (10) has a head member (11) and a back member (12) joined therewith, the head member (11) having a central cavity (20) dimentioned to receive an insert member (25) with a press-fit. The insert member (25) is generally dome-shaped with its peripheral wall (27) upwardly tapered. The cavity (20) is defined by an inner wall (22) initially upwardly flared but deformed to taper when a peripheral ridge (23) is clamped against the insert member (25) by a punch (P) capable of producing a clamping pressure of a bidirectional vector. |
