| 摘要 |
A rotatable socket for supporting a tool for rotation in a head housing of a dental handpiece. The socket includes a cylindrical or hollow tubular shaft for supporting a tool extending out of one end and having a dog for engaging a flattened surface on the shank of the tool for transmitting torque. To hold the tool in the socket, the socket has a catch device comprising at least one resilient element with a catch nose being disposed in the interior of the shaft to extend parallel to the axis of the shaft with the catch nose releasably engaging an annular groove in the shank of the tool. To disengage the tool, the catch device also includes a pressure element, which is disposed on the housing adjacent the free end of each resilient support element and which is urged into engagement with the free end of the support element to cause disengagement of each of the catch noses when a purchase has been actuated by pressure from the operator's thumb. |
