Chucks or sockets – Socket type – Lost motion
Patent
1998-07-22
2000-07-25
Bishop, Steven C.
Chucks or sockets
Socket type
Lost motion
279 14, 279 22, 279 24, 279 71, 279 75, 279905, B23B 4516, B23B 3122
Patent
active
06092814&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a tool holder for tools inserted into machines for drilling and/or percussion operation.
In tool holders of the kind mentioned above, it is already known from DE 41 04 131 A1 for the purpose of receiving different tool shanks to use combination tool holders with two functionally distinct tool receptacles for tools having a round shank and tools having a grooved shank. Both tool receptacles are formed in a common or shared tool holder which is complicated to produce with respect to manufacturing technique and which has means for rotational driving of inserted tools with a round shank or grooved shank. It is further known from DE 33 10 147 A1 to receive tools with a round shank and with a grooved shank having different diameters in a tool holder, wherein radially adjustable clamping jaws are arranged in the tool receptacle of the tool holder which either clamp the round shank between the clamping jaws or engage in corresponding axial grooves in the grooved shank for rotational driving. In this case, a disadvantage consists in that the clamping jaws must first be opened whenever a tool is changed and must be clamped again manually after changing the tool. Further, adequate axial guidance of the tool by the clamping jaws is impossible in the case of tools with a grooved shank.
Finally, EP 0 293 327 A1 discloses a combination tool holder for tools with a round shank and tools with a grooved shank which have different rotational driving with the same shank diameter of the tools. However, this tool holder cannot be used for tools having a different outer diameter of the shank.
SUMMARY OF THE INVENTION
In the present solution, the objective is to further develop a tool holder for tools inserted in machines for drilling and/or percussion operation in such a way that the tool receptacle can receive tools with a grooved shank of smaller diameter as known from the SDS-plus system as well as tools with a grooved shank having a larger outer diameter, e.g., for medium-duty use (SDS-midi system).
In the tool holder in accordance with the present invention the axial strips which are located opposite from one another and project inwards are guided radially in the tool receptacle, so that they can be released outwards in a springing matter, to enable optional insertion of a tool shank with longitudinal grooves which are located opposite one another and which have a smaller outer diameter, and a tool shank has the same core diameter but also has outwardly projecting longitudinal ridges with a greater outer diameter, wherein for the purpose of rotational driving the axial strips cooperate with the corresponding longitudinal grooves and the axial grooves cooperate with the corresponding longitudinal ridges of respective inserted grooved shank.
The tool holder, according to the invention, has the advantage that insertion tools with two different grooved shank systems with different outer diameters can be inserted into the tool receptacle and locked axially without having to open and close the clamping jaws manually. Both grooved shank systems can also differ from one another in length, wherein in the tool holder for both grooved shank systems the axial guidance is carried out at the continuous axial receptacle bore of identical diameter. In the shank system with the larger outer diameter, additional axial guidance is achieved by the longitudinal grooves in the receptacle bore of the tool receptacle, wherein the base of these longitudinal grooves has a diameter corresponding to the outer diameter of the longitudinal webs or ridges of the tool shank engaging therein.
The axial locking of the tool shanks is carried out in a known manner automatically by locking bodies, especially by a ball which deflects in a radially springing manner when the tool shank is inserted and subsequently springs back into a locking recess at the tool shank and is thus locked automatically. In order to remove the insertion tool, the lock is released manually.
Further advantageous developments and
REFERENCES:
patent: 4691929 (1987-09-01), Neumaier et al.
patent: 5326199 (1994-07-01), Kleine et al.
patent: 5505570 (1996-04-01), Meyen et al.
patent: 5558478 (1996-09-01), Odendahl et al.
Bishop Steven C.
Robert & Bosch GmbH
Striker Michael J.
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