| 摘要 |
A dental handpiece having a head mounted to a shoulder has a coupling ensemble formed of two coupling assemblies. The first coupling assembly is mounted within the shoulder and comprises a gear mounted to a shaft with the shaft extending into a coupling hand. A second like coupling assembly has a bevel gear with a shaft extending therefrom into a coupling hand. The second assembly is mounted within a throat sleeve, which is mounted within the neck of the head. Each coupling hand has a pair of tongues, with slots formed between the side walls of the tongues, to allow the coupling hands to drivingly lock together. The tongues are shaped so that as they are moved into contact with each other, they are directed to have their side walls interlock with one another. The tongues can have anterior slanted walls extending into a point, to facilitate such directing of the tongues into interlocking position. The coupling ensemble thus allows the head to be dismounted from the shoulder so that another head with a different dental tool can be mounted to the shoulder. The first coupling assembly is located within the shoulder, so that when the second coupling assembly and the head are dismounted from the shoulder, the first coupling assembly is contained within the walls of the shoulder so that other objects will not come into engagement with it during rotation.
|
