Chucks or sockets – Accessory or component – Tool or work stop or locator
Patent
1994-01-12
1995-12-12
Bishop, Steven C.
Chucks or sockets
Accessory or component
Tool or work stop or locator
B23B 3120
Patent
active
054743087
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a collet stop as well as to a stop disk and a stop bolt for a collet stop.
In a known collet stop, by driving a tightening screw into a chuck body, three balls disposed regularly over the periphery of the chuck body, supported in corresponding openings, are pressed radially outward by the tightening screw and brace the chuck body in the annular area of the collet. Thereby, however, this part of the collet is crushed, whereby the collet can no longer be inserted in the adapter sleeve. Previously known from EP-A-0 356 575 is a chuck for a turning lathe in which an insert is screwed into an insert nut, which may lead to deformation of the clamp. Conical surfaces at the end of the collet and on the insert cause a deformation of the clamp. Radially outward projecting noses disposed on the insert nut are so formed that, as a rule, only one nose will rest against the end of a slot of the collet since the slots are worked inaccurately. Furthermore, on account of the quick change of the direction of rotation from left to right in turning lathes in the subject of the above-mentioned publication, the insert may loosen.
SUMMARY OF THE INVENTION
It is a task of the present invention to avoid the disadvantages of the prior art and to develop a collet stop for a conventional collet in such a way that during the machining of the workpiece chucked in the collet, the stop for the workpiece cannot be axially displaced by the forces occurring during the machining, and the collet is not crushed or deformed by the collet stop. The collet stop shall be insertable in the collet as a whole from the rear. This is achieved according to the invention by features described herein. Furthermore, it is a task of a preferred embodiment of the present invention to form the collet stop in such a way that the stop takes place at the edge of all slots of the collet, even if the slots are inaccurately worked. This is achieved according to the invention in that the chucking elements are formed tapering or conical at their outer ends. A further task of a preferred embodiment of the present invention is to be able to displace the chucking organ with the chucking elements axially on the collet from outside. This is achieved according to the invention by at least one clamping means extending through the chucking organ. Furthermore, it is a task of a preferred exemplified embodiment of the invention to lock a stop disk placed on the stop means, or a stop bolt, against axial displacement. This is achieved according to the invention by a setscrew extending through the stop means.
Exemplified embodiments of the invention, as well as their use, are described in detail below with the aid of the enclosed drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a longitudinal section through a first exemplified embodiment of the collet stop with the use of stop disks,
FIG. 2 shows a view from the left according to FIG. 1,
FIG. 3 shows a longitudinal section through the first exemplified embodiment with the use of stop bolts,
FIG. 4 shows a longitudinal section through a second exemplified embodiment of the collet stop with the use of stop disks,
FIG. 5 shows a longitudinal section through a third exemplified embodiment of the collet stop,
FIG. 6 shows a longitudinal section through the rear part of a fourth exemplified embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The first exemplified embodiment of the collet stop is described with the aid of FIGS. 1 to 3. The complete collet stop 1 is inserted in a collet 2 from the rear. The end face 3 of the collet is pressed against the flange of a non-depicted headstock of a turning lathe, the flange engaging an annular recess 4 on the end face 3 of the collet. Seated on the outside of the collet 2 is a likewise non-depicted adapter sleeve which comprises an inner cone that presses against a cone 5 of the collet. Headstock, adapter sleeve, and collet are previously known from the prior art. The collet 2 is provided, uniformly distrib
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patent: 2871023 (1959-01-01), McCormick
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patent: 3540748 (1968-05-01), Buck
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patent: 3615101 (1971-10-01), Oliver
patent: 3718339 (1973-02-01), Dunham et al.
patent: 4552370 (1985-11-01), Baumgartner
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