1. Field of the Invention
The present invention relates to a power tool stand and a tool coupling for mounting a portable power tool, in particular, a core drilling tool for drilling concrete and brickwork on the stand.
2. Description of the Prior Art
During core drilling of stone and the like, the necessary high torques and displacement forces are usually applied by the power tool to the power tool stand that is fixedly connected with a constructional component. The forces, which are applied by the power tool, are transmitted in the constructional component via a displaceable guide carriage which includes tool coupling means for a central attachment of the power tool, symmetrically to a guide rail and further, via a bottom plate.
German Publication DE 32 37 057 discloses mounting, on a guide rail of a power tool stand, of a displaceable guide carriage having a carriage coupling member with a clamping surface. A tool coupling member, which is associated with the carriage coupling member, is connectable therewith, and has a clamping surface that cooperates with the clamping surface of the carriage coupling member, provides for mounting of the power tool on the carriage. The tool coupling member has an acute, exposed, and projecting nose that engaging (at a conventional mounting) in a lower portion of the carriage coupling member, provides for hanging of the power tool on the carriage coupling member. The power tool is then pivoted in its locking position and is locked. The power tool can be reliably secured with an insertable lever that eccentrically displaces free-lying, circumferentially arranged bolts of the carriage coupling member.
An object of the present invention is a power tool stand and a tool coupling therefor having a smaller and less extending tool coupling member.
Another object of the present invention is to provide for a technologically easy manufacturing, in particular, of the tool coupling member.
These and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a power tool stand including a guide carriage, and a tool coupling for a portable power tool and having a carriage coupling member provided on the guide carriage and which has a clamping surface and two hooks spaced from each other along the clamping surface, with at least the first hook being displaceable along the clamping surface. The tool coupling further has a tool coupling member for the power tool and which has a clamping surface and is connectable with the carriage coupling member, with the tool coupling member having two free-lying, arranged at least partially circumferentially, bolts which can be hanged behind the two associated hooks of the carriage coupling member
With the tool coupling member having two free-lying arranged at least partially circumferentially, bolts which can be hanged behind the two associated hooks of the carriage coupling member, an exposed projecting nose can be eliminated, which permits to make the tool coupling member smaller and at least partially integrate it in the interior of the power tool. Further, even in the non-locking position, with the tool coupling member having two bolts, the power tool is supported at two points and, thus, is unpivotably supported on the stand. The manufacturing of the tool coupling member is technologically simple as bolts are standard parts and should be secured so that they lie freely and at least partially circumferentially and only slightly loaded, e.g., in holes of two parallel to each other plates of the tool coupling member.
Advantageously, the first hook is displaceable by an eccentric mechanism, whereby locking is effected automatically.
Advantageously, the eccentric mechanism is formed of a cylindrical sleeve and an eccentric bolt displaceable therein and having, advantageously, a radial helical contact surface which provides for application thereto of high locking forces which do not cause any significant wear.
Advantageously, the eccentric mechanism includes a lever receptacle for receiving a lever therein. Thereby, at a corresponding use, the lever itself can be removed and is not damaged.
Advantageously, the first hook is provided on a pivotal lever that is pivoted by the eccentric mechanism, which insures transmission of a locking force.
Advantageously, the second hook is fixedly secured on the carriage coupling member, which insures an easy mounting of the second hook, e.g., by screwing it in.
Advantageously, the clamping surfaces of the carriage coupling member and the tool coupling member are inclined toward a displacement direction of the guide carriage. Thereby, in applications when the carriage is displaced in a horizontal direction, water, which can accumulate on the clamping surfaces, automatically flows away.
Advantageously, on both the tool coupling member and the carriage coupling member, there are provided, respectively, oppositely arranged guide surfaces extending perpendicular to respective clamping surfaces. Thereby, the operational axis of the power tool is positioned, relative to the displacement direction of the guide carriage in a predetermined manner.
Generally, the carriage coupling member is an integral component of the guide carriage. However, advantageously, there are provided T-head elements for connecting the carriage coupling member with the guide carriage and which engage in T-shaped transverse grooves formed in the guide carriage and extending perpendicular to a displacement direction of the guide carriage. Thereby, adjustment of the position of the carriage coupling member on a separate guide carriage becomes possible.
The novel features of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however, both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiment, when read with reference to the accompanying drawings.
The drawings show:
A power tool stand 2, which is shown in
As shown in
According to
Though the present invention was shown and described with references to the preferred embodiment, such is merely illustrative of the present invention and is not to be construed as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the art. It is therefore not intended that the present invention be limited to the disclosed embodiment or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.
Number | Date | Country | Kind |
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10 2007 055 716 | Dec 2007 | DE | national |
Number | Name | Date | Kind |
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3464655 | Schuman | Sep 1969 | A |
4500235 | Johnsen | Feb 1985 | A |
4540149 | Rupprecfht | Sep 1985 | A |
5302045 | Johnsen | Apr 1994 | A |
6568876 | Augustin | May 2003 | B2 |
Number | Date | Country | |
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20090145417 A1 | Jun 2009 | US |