| 摘要 |
A disposable ear-piercing device, ready for immediate use. The disclosure comprises a pair of spaced jaws which receive the earlobe therebetween. One jaw is pre-loaded and carries a piercing pin, while the other jaw is pre-loaded with and carries a locking nut. The jaws are squeezed toward each other in a manner which first causes the earlobe to be gripped and then causes a drive member, carried by the first jaw, to rupture when the jaws are squeezed under a pre-determined force, and to transfer the squeezing force directly to the pin, driving it through the earlobe and into engagement with the locking nut. The pin is carried in a cylindrical barrel and is secured against movement in the barrel by frictional engagement of the periphery of the pin head with a portion of the inner surface of the cylindrical barrel. The functional engagement must be sufficient to secure the pin head against inadvertent movement, but not so much that the pin head will bind in the barrel. Compensation for tolerance variation in the barrel which might cause binding is achieved by forming the wall of the cylindrical barrel, intermediate its end, with a flexible, spring-like portion, coincident with the location of the pin head. Response to axial forces on the pin head is facilitated by the flexing of the spring-like portion.
|
