ROTARY TOOL

Abstract

The subject of the present invention is a rotationally drivable rotary tool device and in particular a rotary brush tool. The invention is equipped, in its basic construction, with a tool holder (1, 2) having at least one drive-side clamping element (1) and a tool-side clamping element (2). The two clamping elements (1, 2) are connected releasably together and receive a rotary tool (5, 6). Furthermore, the two clamping elements (1, 2) ensure that the rotary tool (5, 6) is held. According to the invention, the tool-side clamping element (2) and the rotary tool (5, 6) define a structural unit (2, 5, 6). To this end, the clamping element (2) in question is configured as a holding cage (2) that encloses the rotary tool (5, 6) radially and axially at least in part.

Claims

1. A rotationally drivable tool comprising: a rotary brush tool; and a tool holder having at least one drive-mounted part and one tool-mounted part, the two parts being releasably interconnected to hold the rotary brush tool, the tool-mounted part and the rotary tool forming a subassembly, the tool mounted part is being to this end a holding cage that at least partially encloses the rotary tool radially and axially.

2. The tool according to claim 1, wherein the drive-mounted part is an adapter that engages releasably in the holding cage.

3. The tool according to claim 2, wherein the holding cage is circular and has peripheral axially extending arms that engage over the rotary tool.

4. The tool according to claim 3, wherein the axially extending arms engage over the rotary tool at cutouts thereof.

5. The tool according to claim 1, wherein the holding cage has a central bore in which the drive-mounted part fits.

6. The tool according to claim 1, wherein the drive-mounted part has peripheral locking pins that, when the holding cage is in the assembled state on the drive-mounted part engage in respective seats in the holding cage.

7. The tool according to claim 6, wherein the locking pins are formed as radially extending locking pins and the respective seats are formed as radially open seats.

8. The tool according to claim 6, wherein the locking pins are braced by springs against an actuator.

9. The tool according to claim 1, wherein the drive-mounted part and a central bore in the holding cage have respective centering formations for mutual alignment and torque-proof coupling in order to hold the drive-mounted part.

10. The tool according to claim 1, wherein the drive-mounted part is connected together with a holding plate and one stop to a rotary drive.

11. In combination: a drive having an output rotatable about an axis; a brush tool having a ring and a multiplicity of bristles projecting radially from the brush except at a plurality of cutouts generally angularly equispaced cutouts; an adapter mountable on the drive output for rotation therewith and having an outer surface; a cage having an inner ring complementarily fittable around the adapter and fittable within the ring of the brush tool and an outer ring formed by a plurality of axially extending arms each fittable in a respective one of the cutouts when the brush ring is between the inner and outer rings; and latch means on the adapter and cage for releasably securing the cage and brush tool on the adapter.

Description

[0030] The invention is explained in further detail below with reference to a schematic drawing that illustrates only one embodiment. In the drawing:

[0031] FIG. 1 is a partly cutaway top view of the rotationally driven rotary tool according to the invention,

[0032] FIG. 2 shows the rotary drive with the adapter, the holding plate, and the stop connected thereto,

[0033] FIG. 3 shows the subassembly of the holding cage and the rotary tool,

[0034] FIG. 4 shows the tool of FIG. 1 with the adapter in section, and

[0035] FIG. 5 shows the adapter alone.

[0036] In the drawings, a rotationally driven rotary tool is shown that in this embodiment and without limitation thereto is a rotary brush or a rotary-brush tool. The basic construction of the tool shown comprises a tool holder 1, 2 equipped with at least one drive-mounted part 1 and a tool-mounted part 2.

[0037] In the illustrated embodiment, the drive-mounted part 1 is an adapter 1 that is connected to a rotary drive 3 (shown schematically in FIG. 2) or its drive shaft. A holding plate 4 and a stop S can also be seen in FIG. 2. In the present case, the holding plate 4, the adapter 1, and the stop S are securely connected to the rotary drive 3. Moreover, the design is such that rotation of the output shaft of the rotary drive 3 is transmitted to the adapter 1.

[0038] The tool-mounted part 2 shown in FIG. 3 is a holding cage 2 that encloses a rotary tool 5, 6 partially radially and axially. As a ring brush or its output shaft 5, 6, the rotary tool 5, 6 is equipped here with an annular belt ring 6 and bristles 5 that are connected to the belt ring 6 and project radially therefrom.

[0039] The two parts 1, 2 or the adapter 1 and the holding cage 2 are releasably interconnected and receive and grip the rotary tool 5, 6 in question. By virtue of the releasable connection of the adapter 1 to the holding cage 2, rotation of the output shaft of the rotary drive 3 is transmitted via the adapter 1 to the holding cage 2 and thus to the rotary tool 5, 6 carried along by the holding cage 2 and rotating as a result, as indicated by a double arrow in FIG. 1 for both possible directions of rotation.

[0040] As can be seen in FIG. 3, the holding cage 2 is a circular annular cage. Right away, one sees a central bore 7 in the holding cage in question or circular annular cage 2 that is used and designed to receive the adapter 1. A ring or inner retaining ring 8 is also provided that surrounds the central bore 7. Radial webs 9 are connected peripherally to the inner retaining ring 8 so as to be distributed over its circumference. In this embodiment, and without limitation thereto, the radial webs 9 are spaced angularly by 120.

[0041] Two radial webs 9 that are axially opposite one another relative to the central inner retaining ring 8 are interconnected by respective axially extending arms 10 that connect the two radial webs 9 at their outer ends. Again, and without restriction thereto, the axially extending arms 10 are also uniformly angularly spaced 120 apart so as to be distributed over the circumference of the ring or inner retaining ring 8. The axially extending arms 10 define a outer retaining ring that is indicated by dashed lines in FIG. 3 and spaced radially outward of the inner retaining ring 8.

[0042] The axially extending arms 10 engage over the rotary tool 5, 6. For this purpose, the rotary tool 5, 6 has cutouts 11 in which the axially extending arms 10 are provided and engage over the rotary tool or the ring brush 5, 6.

[0043] The axially extending arms 10 and the outer retaining ring and the inner retaining ring 8 now ensure that the rotary tool 5, 6 or its belt ring 6 is secured radially inside the holding cage 2 that is formed in this way and radially enclosed by the holding cage 2. Relative to the central inner retaining ring 8, the radial webs 9 also provide axial support through the holding cage 2 and ensure that the holding cage 2 encloses the rotary tool 5, 6 axially. Since the axially extending arms 10 are provided only partly on the circumference of the inner retaining ring 8 and are spaced apart therefrom, no continuous outer retaining ring is defined by the axially extending arms 10, but rather only a virtual annular surface that is indicated by dashed lines in FIG. 3. Nevertheless, the holding cage 2 formed in this way provides for the desired receiving and holding of the rotary tool 5, 6 and secures it radially and axially.

[0044] In principle, the rotary tool 5, 6 can now be received with play within the holding cage 2. According to an advantageous embodiment, however, the rotary tool 5, 6 is mechanically coupled with the holding cage 2. In fact, the rotary tool 5, 6 or the ring brush 5, 6 used here generally has a belt ring 6 made of plastic. The holding cage 2 is also advantageously made of plastic. Different plastics can be used, for example polyamide (PA) for the belt ring 6 and polyethylene (PE) for the holding cage 2. In any case, the holding cage 2 and the belt ring 6 can be welded together (ultrasonically). This is obviously only for the sake of example and not restrictive. The tool-mounted part or the holding cage 2 and the rotary tool or the ring brush 5, 6 thus define a subassembly 2, 5, 6.

[0045] In looking at the adapter 1 as in FIGS. 2 and 5, it is immediately apparent that, in the embodiment and without limitation thereto, the adapter 1 is disk-shaped or cylindrical. In fact, the adapter 1 is adapted to the size and shape of the central bore 7 in the holding cage 2. In addition, the adapter 1 has peripheral locking pins 12. When the adapter is in the assembled state, the locking pins 12 engage in respective seats 13 in the holding cage 2.

[0046] As can be seen in FIG. 4, the seats 13 are in fact located in the inner retaining ring 8, specifically at the radial webs 9. In this way, the adapter 1 can be quite intuitively connected in a releasable manner to the holding cage 2.

[0047] The locking pins 12 are radial locking pins 12, i.e. locking pins 12 that engage radially in the respective seats 13.

[0048] It is also for this reason that the seats 13 are formed as radially inwardly open seats 13 in the illustrated embodiment. The locking pins 12 are now braced by respective springs against an actuator 14.

[0049] In the embodiment, the actuator 14 is a central knob 14 of the adapter 1. When actuated, the actuator 14 and spring biasing retract the locking pins 12 radially into the adapter, so that, in this depressed position of the actuator knob 14, the subassembly 2, 5, 6 can be pulled without any difficulty for removal of the holding cage 2 and the rotary tool 5, 6 from the adapter 1 that is connected to the rotary drive 3. What is more, this enables differently designed rotary tools 5, 6, including a holding cage 2, to each be securely anchored as a subassembly 2, 5, 6 on the adapter 1 connected to the rotary drive 3.

[0050] Once the actuating knob or the actuator 14 is released, its spring moves the actuator 14 so that the locking pins 12 are forced outward into their extended position. In this extended position, the locking pins 12 can engage in the seats 13 and anchor the subassembly 2, 5, 6 of the holding cage 2 and the rotary tool 5, 6 in a torque-transmitting manner on the adapter 1. When the adapter 1 is rotated by the drive 3, the rotary tool 5, 6 is also rotated.

[0051] Also visible are corresponding centering formations 15, 16 on the adapter 1 on the one hand and on the other hand on the inner retaining ring 8 around the central bore 7. The centering formations 15, 16 are flats that ensure that the otherwise circular-section adapter 1 can engage in a torque-transmitting and centered manner in the central bore 7 that is otherwise also circular in cross section. This ensures that the holding cage 2 with the rotary tool 5, 6 mounted therein can be rotationally fixed on the adapter 1 and, consequently, rotation of the rotary drive 3 or its output shaft is transmitted properly to the rotary tool 5, 6.