Rotationally drivable rotary tool device

Abstract

To provide a rotary tool device which enables quick and functional replacement of a tool side clamp element having a rotary tool from a drive side clamp element to be performed easily in a dirty state.SOLUTION: The invention is directed to a rotationally drivable rotary tool device, in particular, a rotary brush tool, which includes tool holders (1, 2) having at least one drive side clamp element (1) and one tool side clamp element (2). Both of the clamp elements (1, 2) are separably coupled to each other to house and retain rotary tools (5, 6). According to the invention, the clamp element (2) at the tool side and the clamp element (1) at the drive side are connected to each other by bayonet coupling (7).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rotatable rotary tool device, particularly a rotary brush tool, having a tool holder with at least one drive-side clamping element and one tool-side clamping element, the two clamping elements being releasably coupled to each other and accommodating and holding a rotary tool.

Background Art

[0002] The drive-side clamping element can be rotated, for example, by a rotary drive unit via a mandrel or the like. In contrast, the tool-side clamping element is typically used to accommodate and hold the rotary tool. Thus, once the drive-side clamping element and the tool-side clamping element are releasably connected to each other, the tool-side clamping element, and thus the rotary tool, can be caused to rotate via the drive-side clamping element by the rotary drive unit.

[0003] In the case of a rotatable rotary tool device of the configuration described at the beginning, as described in European Patent No. 2371487, two specially designed clamping elements are provided and are releasably connected by a locking element against the force of at least one spring. Both clamping elements or the corresponding tool holder are used to accommodate the rotary tool. The rotary tool can be, for example, a rotary brush having a flexible brush belt, as described in the applicant's German Patent No. 4205265, which is also relevant here. However, basically, the tool holder can also accommodate a rotary tool according to European Patent No. 1859903.

[0004] An equivalent rotary-driven rotary tooling device is described in West German Patent Application Publication No. 10030586, which uses a tool having a circular disc-shaped tool body. The tool body has a central opening for fixing to a machine tool or generally a rotary drive unit. A support device is provided within the opening, which grips the edge of the opening on at least one side of the tool body. A fixing device is provided on the other side of the tool body, which can be attached to a machine tool, and once the fixing device is attached, the support device can be detachably fixed to the machine tool. This fixes the tool body as a whole in the axial direction and holds it non-rotatable. Known support devices are obviously only suitable for coupling with a circular disc-shaped tool body designed as a cutting or grinding disc.

[0005] Furthermore, rotary brush tools are known in various forms from practice and literature. Thus, West German Patent No. 4326793 addresses a rotary-driveable brush unit in which the brush holder comprises two end discs spaced apart by a divided spacer bush, and these end discs have an axial web positioned at a predetermined interval from the sides of the bush and distributed around the discs. The ring brush has outwardly projecting bristle and a flexible brush belt having a belt zone without bristle for the axial web that grips the brush belt.

[0006] In the case of a rotary-driven tool clamping device according to European Patent Application Publication No. 0319756, the approach is taken such that two clamping discs have coaxial ring grooves for clamping tool sleeves of substantially the same diameter. In this way, perfect positioning and stabilization of each clamped tool sleeve is ensured without the use of a support such as a rubber core. Finally, from the prior art, a rotary brush tool is known, such as the one described and exemplary used for surface treatment in European Patent No. 0347429. In this case, the brush belt carrier comprises a multi-part clamping unit and a ring body that can be expanded in a spring-back manner by this clamping unit. In addition, the rotary brush tool has a brush belt having a flat cross-section formed as a closed ring.

[0007] The brush belt carrier and brush belt can be configured as a unit. This allows for multifaceted use and effective operation, while simultaneously achieving a long service life.

[0008] The prior art is not satisfactory in all respects. Thus, for example, within the scope of West German Patent No. 4205265 or West German Patent No. 4326793, the work is performed by the flexible belt of the brush tool. This partially and intentionally utilizes the movement of the brush belt relative to the tool holder, as described in European Patent No. 1834733, for machining. In fact, here there is a stopping means that immerses itself in the rotating bristle ring of the ring brush. The stopping means decelerates the bristle for a predetermined time, so after its release, the kinetic energy accumulated is used for additionally impactful machining of the workpiece surface by the bristle. This presupposes some movement of the flexible brush belt within the tool holder.

[0009] In actual use, ring brushes, or their brush belts, may not "fit" precisely with the rotary tooling device described, resulting in more or less uncontrolled movement relative to the tool holder. Consequently, increased wear and even breakage of the ring brushes are often observed.

[0010] For this reason, the similarly common and closest prior art, as described in International Publication No. 2017220338, takes an approach in which the clamping element on the tool side and the rotary tool define the module. Thus, the clamping element in question is formed as a retaining cage that surrounds the rotary tool at least partially radially and axially. The clamping element on the drive side is designed as a retaining adapter that disengages within the retaining cage. Thus, the retaining adapter has locking pins around its periphery, which engage with corresponding housing holes within the retaining cage when the retaining cage is assembled to the retaining adapter. This has been proven effective in principle and also allows for quick and easy replacement of the rotary tool.

[0011] However, in actual and severe cases of contamination, a problem arises in which the retaining adapter may not be able to disengage the surrounding locking pins from the retaining cage at all or with difficulty. This may be due, for example, to the locking pins being blocked by the ingress of dust or dirt. Furthermore, the operating buttons provided in connection with this and acting on the locking pins may also be blocked by dust or ingress of dirt, or at least their functionality may be impaired. Herein, the present invention aims to improve the situation as a whole. [Prior art documents] [Patent Documents]

[0012] [Patent Document 1] European Patent No. 2371487 [Patent Document 2] West German Patent No. 4205265 Specification [Patent Document 3] European Patent No. 1859903 [Patent Document 4] West German Patent Application Publication No. 10030586 [Patent Document 5] West German Patent No. 4326793 [Patent Document 6] European Patent Application Publication No. 0319756 [Patent Document 7] European Patent No. 0347429 [Patent Document 8] European Patent No. 1834733 [Patent Document 9] International Publication No. 2017220338 Brochure [Overview of the project] [Problems that the invention aims to solve]

[0013] The fundamental technical problem underlying the present invention is to develop such a rotary-driven rotary tooling device so that the tool-side clamping element having a rotary tool can be quickly and easily replaced with the drive-side clamping element, even when it is dirty. [Means for solving the problem]

[0014] To solve this technical problem, a general rotary-driven rotary tooling device, within the scope of the present invention, is characterized in that the clamping element on the tool side and the clamping element on the drive side are connected to each other via a bayonet coupling.

[0015] That is, the detachable coupling between the two clamping elements is achieved, according to the present invention, via a bayonet coupling. Such a bayonet coupling provides a rapidly forming and detachable mechanical coupling between the drive-side clamping element and the tool-side clamping element. Thus, the two elements are inserted into each other and coupled or separated again by rotation in opposite directions. To achieve the rotational coupling or bayonet coupling in question, the drive-side clamping element is typically designed in a cylindrical shape, while the tool-side clamping element is a corresponding cylinder sleeve or cylinder disc.

[0016] Therefore, in detail, the intention is that the drive-side clamping element has at least one accommodating groove, and the tool-side clamping element has at least one pin that engages with the accommodating groove. However, the reverse is also possible. In this case, the drive-side clamping element has at least one pin in question, which itself engages with the accommodating groove in the tool-side clamping element. The accommodating groove as a component of the bayonet coupling is usually formed from at least two parts: an axial groove and a radial groove connected thereto. In this case, the design is usually such that the radial groove transitions into a locking groove at the end. The locking groove is advantageously formed as a no-noise groove extending parallel to the axial groove.

[0017] In other words, the housing groove of the drive-side clamping element is generally formed from three parts: an axial groove, a radial groove connected to it, and a locking groove provided at the end of the radial groove. In this way, when the tool-side clamping element's pin is first placed in the axial groove, a combined motion occurs when the drive-side clamping element and the tool-side clamping element are joined. This is usually done against the force of at least one spring acting on the tool-side clamping element. Here, a sliding or "push" motion occurs.

[0018] As soon as the pin engaging with the axial groove reaches a predetermined position or a stopper within the axial groove, a rotational movement “turn” of the clamping element on the tool side relative to the clamping element on the drive side is performed. Finally, at the end side of the radial groove, the spring acting on the clamping element on the tool side contributes to engage the pin with a detent groove or a locking groove extending parallel to the axial groove. This causes a locking-type restraint of the clamping element on the tool side relative to the clamping element on the drive side in the sense of “lock”.

[0019] Therefore, the connection between the clamping element on the drive side and the clamping element on the tool side is made via a bayonet connection in the sense of “push-turn-lock”. Since the bayonet connection can have a relatively large play between one receiving groove and the other pin guided and held therein, it forms a detachable connection between the clamping element on the tool side and the clamping element on the drive side, and the bayonet connection can be detached again when it has more or less significant dirt. For this reason, it is only necessary to complete the working steps already described above. This can be done without a tool as a whole and, in some cases, without acting on blocked or difficult-to-operate operating buttons, so that significant advantages are recognized over the prior art according to WO 2017 / 220338 pamphlet, especially when operating in a dirty state. Here, a substantial advantage can be seen.

[0020] The spring acting on the clamping element on the tool side is usually formed as a helical spring surrounding the clamping element on the drive side. In this way, the helical spring abuts against the clamping element on the tool side with its circumferential circular legs and does not prevent its axial movement along the axial groove or its radial movement along the radial groove when forming the bayonet connection. This applies particularly when the helical spring in question is manufactured from metal, especially steel, and the clamping element on the tool side is manufactured from, for example, plastic or also metal. This is because, in that case, particularly low friction is observed in this regard. In this case, the spring in question contributes as a whole to the clamping element on the tool side being held in the detent groove or locking groove with its pin after the combination with the clamping element on the drive side.

[0021] A particularly advantageous embodiment is characterized in that the clamping element on the drive side comprises three receiving grooves distributed and arranged over its circumference. Thereby, an interconnection taking into account the three fixed points thus realized occurs between the two clamping elements, which fixed points are caused, namely, by the clamping element on the tool side typically also having three pins for engaging in the receiving grooves distributed and arranged over its circumference. This is because as soon as these pins engage in the detent groove during the combination of the two clamping elements, the clamping element on the tool side is aligned with the clamping element on the drive side at three fixed points, whereby the brushing of the clamping elements is determined statically as a whole and no tilting is observed in case. This is particularly important for subsequent rotational action.

[0022] According to another advantageous form, the clamping element on the tool side and the rotary tool define a module. Thereby, particularly simple assembly and storage are ensured. For this purpose, the clamping element on the tool side can basically be formed as a holding cage surrounding the rotary tool at least partly in the radial and axial directions, as detailed in the prior art by WO 2017 / 220338 pamphlet. This is of course only exemplary applied and by no means essential.

[0023] Furthermore, in this regard, the effectiveness has been demonstrated when the retaining cage is provided as a circular ring cage having a surrounding axial web that grips the rotary tool. In this case, the axial web is typically designed so that the axial web grips the rotary tool in the region of the recess. In addition, the retaining cage, and therefore the tool-side clamping element, as a whole, can be provided with a center hole for a pin that protrudes inward. That is, one or more pins extend radially in the direction of the center point of the center hole of the tool-side clamping element or, in this case, advantageously provided, the retaining cage. Finally, the design is further made such that the drive-side clamping element is connected to a rotary drive unit together with a stopping means. The rotary drive unit allows the drive-side clamping element to be rotated. The same applies to the tool-side clamping element, which includes a rotary tool and is detachably connected thereto, because the tool-side clamping element and the rotary tool usually define a module. The stopping means can act on the rotary tool so that, for example, individual brushes are braked and strike the surface to be machined with increased kinetic energy after passing the stopping means. This is described in detail in the applicant's European Patent No. 1834733, and in connection therewith, I would like to explicitly point out the references to this document.

[0024] As a result, a rotary-driven rotary tooling device is provided that offers a detachable coupling, which can be easily and quickly formed and released without tools, through its bayonet coupling between the clamping element on the tool side and the clamping element on the drive side. This is particularly true when one or both of the clamping elements mentioned are more or less dirty, even considering rough working conditions. Herein lies a substantial advantage.

[0025] The present invention will be described in detail below with reference to drawings illustrating only one embodiment. [Brief explanation of the drawing]

[0026] [Figure 1] Perspective view of a rotary tooling device capable of rotational drive. [Figure 2] Side view of the object in Figure 1 [Figure 3] Modified embodiments of the rotary tooling device shown in Figures 1 and 2. [Figure 4] Drive-side clamping element for rotary tooling device shown in Figure 3 [Figure 5] Tool-side clamping element for rotary tooling device shown in Figures 3 and 4. [Modes for carrying out the invention]

[0027] The figure illustrates a rotary tooling device that can be driven to rotation. In this embodiment, and more preferably, the rotary tooling device is a rotary brush tooling device or a rotary brush tool. The device shown has, in its basic structure, tool holders 1 and 2, each having at least one drive-side clamping element 1 and one tool-side clamping element 2.

[0028] The drive-side clamp element 1, within the scope of this embodiment, is a cylindrical retaining adapter 1, as shown in detail in Figure 4, which is rotated by a rotary drive unit 3, implicitly shown only in Figure 2. Therefore, the rotary drive unit 3 can pass through or engage with the center hole of either the drive-side clamp element or the cylindrical retaining adapter 1. Figure 2 shows that, for this purpose and according to this embodiment, the drive-side clamp element 1 is connected to the rotary drive unit 3 in question, together with a stopping means 4.

[0029] The stopping means 4 can interact with the rotating tools 5,6 for this purpose. In this embodiment, the rotating tools 5,6 are ring brushes 5,6, which in detail consist of a brush belt 6 and bristle 5 connected to and projecting radially from the brush belt 6. This can be best understood from the side view or partial cross-sectional view shown in Figure 2.

[0030] According to the present invention, the design is such that the drive-side clamp element 1 and the tool-side clamp element 2 are detachably coupled to each other to accommodate and hold the rotary tools 5 and 6 in question. Bayonet couplings 7 and 8 are realized for the detachable coupling of both clamp elements 1 and 2, which can be best understood by comparing Figures 4 and 5.

[0031] In fact, for this purpose, the drive-side cylindrical clamp element 1 is provided with at least one accommodating groove 7. In contrast, the tool-side clamp element 2 has at least one pin 8 that engages with the accommodating groove 7, which can be understood from Figure 5. Basically, the reverse approach is also possible. In this case, the drive-side clamp element 1 is provided with the pin 8, while the tool-side clamp element 2 is provided with the accommodating groove 7.

[0032] As shown in Figure 4, the accommodating groove 7 is formed from at least two parts. Within the scope of this embodiment, the accommodating groove 7 has a three-part structure. In fact, the accommodating groove 7 consists of an axial groove 7a and a radial groove 7b connected thereto. In addition, a terminal locking groove 7c is also provided, into which the radial groove 7b transitions at the terminal end. The locking groove 7c is a stopper groove, i.e., a groove with a stopper at the terminal end, extending parallel to the axial groove 7a. Another basic structure is the spring 9, which can be understood particularly in Figure 2.

[0033] The spring 9 is a helical spring 9 that surrounds the drive-side clamp element 1. The spring 9, or helical spring, contributes to the tool-side clamp element 2 being held in the locking groove 7c by its corresponding pin 8 after it has joined with the drive-side clamp element 1. For this purpose, the drive-side clamp element 1 typically has three housing grooves 7 distributed around it. Accordingly, the tool-side clamp element 2 has three pins 8 distributed around it for engaging with the corresponding housing grooves 7.

[0034] Furthermore, the design is carried out such that the clamp element 2 on the tool side and the rotary tools 5,6 define modules 2, 5, and 6, as can be best understood from the side view or partial cross-sectional view in Figure 2. In addition, the clamp element 2 on the tool side is formed as a retaining cage 2 that surrounds the rotary tools 5,6 at least partially in the radial and axial directions for this purpose. According to this embodiment, the retaining cage 2 is formed from multiple parts, i.e., consists of multiple clamp elements 2 that can be connected to each other. According to this embodiment, the retaining cage 2 is designed as a circular ring cage having a surrounding axial web 10 that grips the rotary tools 5,6. For this purpose, the rotary tools 5,6 have recesses 11 in which the axial web 10 is positioned.

[0035] The retaining cage 2, or more generally the clamping element 2 on the tool side, is provided with a center hole 12, as a whole and as shown in Figure 5, into which one or three pins, distributed around the periphery, protrude. Thus, each pin 8 is radially aligned toward the center point of the center hole 12.

[0036] To combine the clamp element 2 on the tool side with the clamp element 1 on the drive side—which itself is connected to the rotary drive unit 3—the tool side clamp element or retaining cage 2 is approached such that it is fitted onto the drive side clamp element 1 or a cylindrical pin through its center hole 12—in this case, each pin 8 protruding into the center hole 12 engages with the corresponding housing groove 7. In this case, the pins 7 slide along their respective axial grooves 7a. This is done against the force of the spring 9.

[0037] As soon as the pin 8 reaches the radial groove 7b, the tool-side clamping element 2 can be locked by a rotational motion relative to the drive-side clamping element 1, following an initial pushing motion. At the end of this rotational motion, the pin 8 is displaced into the locking groove 7c by the action of the spring 9, so that after the formation of the bayonet couplings 7,8, the tool-side clamping element 2, together with the rotary tools 5,6 or their modules 2,5,6 realized in place, is locked relative to the drive-side clamping element 1. To release the tool-side clamping element 2 from the drive-side clamping element 1, the process described above must be reversed.

Claims

1. A rotary tool device, in particular a rotary brush tool, which can be rotated, has a tool holder (1, 2) with at least one drive-side clamping element (1) and one tool-side clamping element (2), the clamping elements (1, 2) being releasably connected to one another and accommodating and holding rotary tools (5, 6), A rotary tool device, characterized in that the tool-side clamping element (2) and the drive-side clamping element (1) are connected to each other via a bayonet connection (7, 8).

2. 2. The rotary tool device according to claim 1, characterized in that the clamping element (1) on the drive side comprises at least one receiving groove (7) and the clamping element (2) on the tool side comprises at least one pin (8) which engages in the receiving groove (7), or vice versa.

3. 3. The rotary tool device according to claim 2, wherein the receiving groove (7) is formed of at least two portions, an axial groove (7a) and a radial groove (7b) connected thereto.

4. 4. A rotary tool device according to claim 3, characterized in that the radial grooves (7b) merge into locking grooves (7c) at their terminal ends.

5. 5. A rotary tool device according to claim 4, characterized in that the locking groove (7c) is formed as a blind groove extending parallel to the axial groove (7a).

6. 2. A rotary tool device according to claim 1, characterized in that at least one spring (9) is provided which acts on the tool-side clamping element (2).

7. 7. A rotary tool device according to claim 6, characterized in that the spring (9) is designed as a helical spring (9) surrounding the drive-side clamping element (1).

8. 8. A rotary tool device according to claim 6 or 7, characterized in that a spring (9) holds the tool-side clamping element (2) with its pin (8) in the locking groove (7c) after coupling with the drive-side clamping element (1).

9. 2. A rotary tool device according to claim 1, characterized in that the drive-side clamping element (1) comprises three receiving grooves (7) distributed over its periphery.

10. 10. A rotary tool device according to claim 9, characterized in that the clamping element (2) on the tool side comprises three pins (8) arranged distributed over its periphery for engaging in the receiving grooves (7), or vice versa.

11. 2. The rotary tool device according to claim 1, wherein the clamping element (2) on the tool side and the rotary tool (5, 6) define a module (2, 5, 6), whereby the clamping element (2) is formed as a holding cage (2) which at least partially surrounds the rotary tool (5, 6) radially and axially.

12. 12. A rotary tool device according to claim 11, characterized in that the holding cage (2) is provided as a circular ring cage with peripheral axial webs (10) that grip the rotary tools (5, 6).

13. 13. A rotary tool device according to claim 12, characterized in that the axial webs (10) grip the rotary tools (5, 6) in the region of the recesses (11).

14. 2. A rotary tool device according to claim 1, characterized in that the tool-side clamping element (2) comprises a central hole (12) with a pin (8) projecting therein.

15. 2. A rotary tool device according to claim 1, characterized in that the drive-side clamping element (1) is connected to the rotary drive unit (3) together with the stop means (4).

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