Abstract
A tool attachment, in particular hole saw, for a power tool having a driving axle that is drivable in oscillation. The tool attachment including a connecting device with which the tool attachment is attachable to a power tool such that the driving axle thereof and a tool axis essentially coincide. A work area has teeth that are at least partially circular in design and adjoin a hollow, cylindrical base. At least two openings formed in the base, the at least two openings constitute at least 60%, at least 80%, or at least 90% of the area of the base.
Claims
1. A tool attachment, in particular hole saw, for a power tool having a driving axle that is drivable in oscillation, the tool attachment comprising: a connecting device with which the tool attachment is attachable to a power tool such that the driving axle thereof and a tool axis essentially coincide; a work area having teeth that are at least partially circular in design and adjoin a hollow, cylindrical base; and at least two openings formed in the base, the at least two openings constitute at least 60%, at least 80%, or at least 90% of the area of the base.
2. The tool attachment according to claim 1, wherein the openings each have a polygonal shape or a hexagonal shape.
3. The tool attachment according to claim 1, wherein the openings are formed as circular areas and are arranged in rows.
4. The tool attachment according to claim 3, wherein the circular areas include at least a plurality of first circular areas, each with a first diameter, and a plurality of second circular areas, each with a second diameter, and wherein the first diameter is greater than the second diameter.
5. The tool attachment according to claim 4, wherein center points of the second circular areas are located at intersection points of diagonals between opposing first circular areas.
6. The tool attachment according to claim 3, wherein rows of the circular areas are not oriented parallel to the working area.
7. The tool attachment according to claim 1, wherein the openings are shaped as triangles.
8. The tool attachment according to claim 7, wherein the triangles are designed as axially offset, in particular isosceles, triangles whose vertices are oriented substantially in a direction of the working area.
9. The tool attachment according to claim 1, wherein the base is connected to the connecting device via spokes.
10. The tool attachment according to claim 9, wherein at least a first angle between a first pair of adjacent spokes is greater than a second angle between a second pair of adjacent spokes.
11. The tool attachment according to claim 9, wherein the spokes are formed in a Y-shape.
12. The tool attachment according to claim 1, wherein an accessory is arranged in an area of the connecting device and/or in a base, and wherein the accessory is a center point, a valve opener, an ejector, or a depth stop.
13. The tool attachment according to claim 1, wherein the base is a hollow, cylindrical base made of a flat material or of a strip stock, whose ends are welded or laser welded.
14. The tool attachment according to claim 1, wherein a diameter of the hollow, cylindrical base is between 40 mm and 115 mm.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limitive of the present invention, and wherein:
[0019] FIG. 1 is a perspective view of a tool attachment;
[0020] FIG. 2 is a top view of a flat material of a base of the tool attachment with different openings;
[0021] FIG. 3 illustrates various spokes connecting the base to the connecting device; and
[0022] FIG. 4 is a partially sectional view of a tool attachment.
DETAILED DESCRIPTION
[0023] FIG. 1 shows, in a perspective view, a tool attachment 1 for a power tool that has a driving axle that can be driven in oscillation. The tool attachment 1, which is implemented as a hole saw 2, has a connecting device 3 with which it can be attached to a power tool in such a manner that the driving axle thereof and a tool axis 4 of the tool attachment 1 essentially coincide. In addition, the tool attachment 1 includes a circular working area 5 with teeth 6, which adjoins a hollow, cylindrical base 7. Formed in this base 7 are openings 8, which in the exemplary embodiment shown constitute about 80% of the area of the base 7 and are formed as circular areas 9, which are arranged in rows. The base 7 is connected to the connecting device 3 by spokes 11, by which means the weight and thus the moment of inertia can be further reduced on the one hand, and on the other hand the stability of the hole saw 2 can be ensured. In the area of the connecting device 3, an accessory 12 in the form of a valve opener 13 is screwed in, which makes it possible to use the hole saw 2 to saw open packages that are composed of an outer package and an inner package located therein and in which a valve provided for filling the inner package, which is configured as, e.g., a pouch, is incorporated into the outer package. In order to be able to separate the two packages from one another, the valve must be opened prior to sawing open the outer package in order to be able to equalize the pressure. Such packages are used for liquids such as wine, for example. The valve opener 13 in this case is configured as a mandrel 14, which is made of steel. Alternatively, the accessory 12 can also be configured as a center point, an ejector, or a depth stop 20.
[0024] As can also be seen in FIG. 1, the hollow, cylindrical base 7 of the tool attachment 1 is made of a flat material 15 whose ends are welded together. The welded contact area 16 at the end is visible as a line here. The diameter of the hollow, cylindrical base 7 in this case is between 40 mm and 115 mm.
[0025] In FIG. 2, different shapes of the openings 8 can be seen by way of example. The openings 8 in section A are formed as circular areas 9. In section B, the openings 8 each have a hexagonal shape. This produces a honeycomb structure 17, which is especially stable. In order to improve chip removal, the openings 8 in section C are designed as isosceles triangles 18 that are offset axially and whose vertices are oriented substantially in the direction of the working area 5. In section D, along with the openings 8, which are formed as polygons or as circular areas or elliptical areas, a scale 19 is also printed with which the user of the hole saw 2 can read off the depth of the drilled hole, and thus the progress of the work. Because of the only small oscillation of a few degrees, this scale 19 can also be read during operation. The openings 8 in section E are formed as circular areas 9, 10, which are arranged in rows. The circular areas 9, 10 in this design include a multiplicity of first circular areas 9, each with a first diameter, and a multiplicity of second circular areas 10, each with a second diameter. The first diameter is greater than the second diameter in this design. The circular areas 9, 10 in this design are arranged such that the center points of the second circular areas 10 are located at the intersection points of the diagonals between opposing first circular areas 9. While the first circular areas 9 serve the purposes of weight reduction and chip removal, the second circular areas 10 additionally serve to accommodate a depth stop 20, which can be composed, for example, of two wire clips 21 that are inserted into the second circular areas 10 and are hooked together. Moreover, in the exemplary embodiment shown, the rows of the circular areas 9, 10 are not oriented parallel to the teeth 6 of the working area 5, by which means the position of the depth stop 20 can be adjusted even better.
[0026] FIG. 3 shows various connections between the connecting device 3 and the hollow, cylindrical base 7 in a top view. In region I, the connection is accomplished by spokes 11, which taper toward the outside. Openings 8, which in the present case are trapezoidal, can likewise be formed in these spokes 11 in this design. In region II, one of the spokes 11 is omitted, which makes it possible to pass, e.g., a cable through, which is advantageous when placing wall outlets. In region III, the spokes 11 are Y-shaped. It is self-evident that these embodiments shown here are to be understood as examples only and that other spoke shapes are possible. It is also noted that all spokes 11 that serve to join the connecting device 3 with the hollow, cylindrical base 7 are identical in design in each case. In other words, the spokes 11 all are either Y-shaped, as shown in region III, or they are straight and/or additionally have openings 8, as is shown in region I.
[0027] FIG. 4 shows a partially sectional view of the tool attachment 1, in which the openings 8 are composed of the first circular areas 9 and of the second circular areas 10. The depth stop 20, which is composed of two interlocked wire clips 21, is inserted into the second circular areas 10, which have a smaller diameter than the first circular areas 9.
[0028] The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are to be included within the scope of the following claims.
