| 摘要 |
The invention is concerned with tool-carrier devices having a variable pre-determined axial travel, of the type currently employed in the aeronautical industry in particular, for milling housings in metal sheets to a pre-determined axial depth, for receiving rivet heads for example. In one of the improvements of the invention, between the body and the sheath of the tool-carrier is interposed an intermediate sleeve which is keyed axially on the body and rotatable with respect thereto, the sheath being movable axially with respect to the sleeve but being keyed angularly on the sleeve. This definite separation of the movements of translation and rotation reduces wear in the moving parts and improves the precision. In a further improvement, the thrust-bearing is provided with a freely rotatable annular supporting ring mounted on and projecting from the free extremity of the bearing, thus eliminating contact of the tool-carrier with the surface to be machined and protecting this surface from damage by the tool-carrier.
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