Chucks or sockets – Socket type – Side detent
Patent
1996-02-14
1997-08-26
Bishop, Steven C.
Chucks or sockets
Socket type
Side detent
2791051, 408226, B23B 3107
Patent
active
056604009
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/DE94/00911 filed Aug. 6, 1994 and based, in turn, upon German national application P43 27 698 under the International Convention.
FIELD OF THE INVENTION
Specification
The invention relates to a chuck and an associated tool wherein the chuck has a main tool holder body with a receiving bore and the tool has a shank received in that bore and held therein in at least one transversely movable fastening element which engages the tool at the circumference of its shank.
BACKGROUND OF THE INVENTION
Due to their general use, chucks or couplings can have a main body with a receiving bore for a tool provided with a shank, whereby further in the main body at least one transversely movable fastening element is arranged for fastening the tool by engagement with the periphery of its shank. Such shank tools held by by chucks are used, for instance, in drop forging, when impressions have to be created in plate-shaped workpieces. In order to achieve a high chip removal rate it is necessary for the chuck to hold the tool securely and free of vibrations. This is also achieved by adjusting the projection length to the respective operation, which requires a large variety of tools due to the differently stepped shank lengths.
Furthermore from U.S. Pat. No. 5,080,536 a chuck for an adjustable shank tool is known. Several locking screws as well as a slotted clamping sleeve serve for fastening the shank tool in the tubular coupling part or chuck. The clamping sleeve surrounds the shank tool and supports it inside the tubular coupling part. The locking screws engage partially on the outside of the clamping sleeve and partially reach through a slot in the clamping sleeve, engaging directly the shank of the tool. A precisely defined adjustment of the shank tool is not possible and expenses and tolerances are high due to the clamping sleeve.
A further chuck is known from DE 21 41 637 A1 and assumes that the shank of the tool is provided with a flat threading and with flat surface extending over the entire shank length. The main body of the chuck is sleeve-like and has a blind bore, wherein two peripherally originating locking screws engage and press against the flat shank surface for fastening purposes. A nut is arranged in front of the blind bore and makes it possible to adjust the shank position in relation to the chuck in accordance with the pitch of the thread.
OBJECT OF THE INVENTION
It is the object of the invention to improve a tool of the type described to make it adjustable in a simple manner without complications and enable the user to make do with fewer tools in comparable work processes.
SUMMARY OF THE INVENTION
In order to solve this problem the invention provides that the shank of the tool be provided with several acting and holding surfaces arranged at an axial distance from each other and assigned to the fastening element.
By arranging several acting and holding surfaces at an axial distance from each other it is possible to arrange the tool in the chuck with an exact fit and to fasten it with specified defined variable projection lengths. In this way the user is in a position to use one and the same tool optimally, as well as to use it for different work situations. After releasing the fastening element or elements, he can always adjust the tool directly in the chuck and secure it again in a different work position. The tool can be adjusted to a multitude of various work positions corresponding to the number of the acting and holding surfaces arranged on the shank of the tool, whereby the fastening element in the form of a locking screw performs the function of a centering screw and of a clamping screw.
According to a preferred embodiment example two fastening elements in the form of screws are provided, whereby the one fastening element has primarily the function of a centering and clamping screw and the other fastening element having a flat surface acts primarily as a tightening and check screw. The acting and holding
REFERENCES:
patent: 2529396 (1950-11-01), Hunt
Kasmeier Georg
Mintert Klaus
Bishop Steven C.
Dubno Herbert
Widia GmbH
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