CN1630571B - Insert tool comprising an attaching unit - Google Patents

Abstract

The invention relates to an insert tool comprising an attaching unit (10) for a machine tool (12), particularly for a hand-guided angle grinder, and comprising a drive device (14). When the insert tool is in an operating position, the attaching unit (10) comprises at least one detent element (16, 18, 20), which is provided for fastening while being oriented towards the drive device (14).

Description

Plug-in tool with one fixed unit

technical field

The invention relates to a plug-in tool with a fastening unit.

Background technique

Known from document DE 100 17 458 A1 is a tool holder for a hand-operated angle grinder and a plug-in tool with a hub. The tool holder has a drive, by means of which a hub or a fastening unit of the plug-in tool can be functionally connected to a drive shaft. The disk hub of the plug-in tool is functionally connected to the drive device via the locking part of the drive device which can be moved against the spring element. A recess is provided in the disk hub, in which recess the locking element engages in a form-fitting manner in an operating position of the plug-in tool and secures the plug-in tool.

Contents of the invention

The invention relates to a plug-in tool for machine tools, in particular for hand-operated angle grinders, having a fastening unit provided with a drive.

According to the invention, a plug-in tool is proposed with a fastening unit, which is formed by a plate hub, for a machine tool, which is provided with a drive, wherein the fastening unit is An operating position has at least one locking element pointing towards the drive for fixing, wherein a form-fitting fixation of the fixing unit in the axial and circumferential direction can be achieved by means of the locking element, wherein: the locking The locking element is configured as an S-shape, wherein the locking element has a first portion extending approximately in the axial direction for fixing in the first circumferential direction, and a second portion connected substantially vertically to the first portion. The portion is for fixation in the axial direction and has a third portion extending approximately in the axial direction away from the first portion for fixation in the second circumferential direction.

The invention proposes that, in the working position, the fastening unit has at least one locking element facing the drive for fastening. It enables a fastening unit for mounting a plug-in tool in a power tool, wherein easily lost parts, in particular clamping flanges, clamping nuts etc., can advantageously be dispensed with. The correct mounting of the plug-in tool, especially in the case of swivel-dependent plug-in tools, is ensured by means of a locking element against the drive. This locking against the drive leads to an intuitively correct mounting of the plug-in tool in the correct working position. In addition, the safety for the operator can be increased in that only plug-in tools provided by the manufacturer can be fitted. This enables a so-called closed system.

The fixing unit and the locking piece can be made in one piece or in multiple parts. If the fastening unit and the locking element are designed in multiple parts, the locking element and the fastening unit can be produced from different materials. Different materials can be designed and dimensioned accordingly based on specific requirements or different loads, such as shear, compressive and/or tensile loads. However, it is particularly advantageous if the locking element is formed in one piece with the fastening unit. This makes it possible to achieve a fastening unit which is simple to construct and can be produced cost-effectively. And additional components, cost and installation time can be avoided.

If the locking element is formed on the fastening unit by means of a stamping process, the locking element and the fastening unit can be produced and the locking element shaped in one single process from one overall unit. Process steps, such as free cutting and bending of the locking element in particular, can be shortened and production costs can be reduced. However, the locking element can also be produced by other methods that are considered expedient by a person skilled in the art, such as by laser cutting, sawing or the like.

In a further refinement of the invention it is provided that the locking element is elastically deformable. This enables a structurally simple fastening of the fastening device in the axial and/or circumferential direction. Additional spring parts can be saved and costs can be reduced.

The invention also proposes that the locking element is formed in the shape of a plate. As a result, the locking element can be constructed elastically and be formed in a simple manner.

If the locking element is configured in an S-shape, then the first portion extending approximately in the axial direction can be used for drive rotation and/or for fastening in the first circumferential direction. The second part, which is connected substantially perpendicularly to the first part, can be used for axial fixing and the third part extending approximately in the axial direction can advantageously be used for fixing in a second circumferential direction.

If the locking elements can be used to achieve a form-fitting fixation of the fixing unit in the axial and circumferential direction, then it is advantageous to transmit the torque through the respective locking elements, fix the plug-in tool in the axial direction and when the tool is switched off Realize the prevention of disengagement of the plug-in tool at the same time. Parts can be saved, especially parts that prevent detachment and costs can be reduced.

In a further embodiment of the invention it is provided that the locking element forms a receiving area which tapers gradually in the direction of rotation. The fastening unit of the plug-in tool can advantageously be pressed against this tapered receiving area during operation, and a play-free fastening of the fastening unit in the axial direction can be achieved through the large contact surface.

In a further configuration of the invention it is proposed that the fastening unit has a centering hole, the plug-in tool can advantageously be centered on a centering flange of the drive, and a low-vibration operation of the plug-in tool can be achieved .

According to the present invention, a tool holder is also proposed, which is used for a plug-in tool as described above.

If the corresponding locking element on the tool holder is displaceable against a spring element, a form-fit with a large span can be achieved and a reliable prevention of disengagement of the plug-in tool in the circumferential direction can be achieved. In addition, when the plug-in tool is inserted on the tool holder and rotated accordingly, the locking part of the plug-in tool and the corresponding locking part will engage with each other with an obviously audible sound echo, and the operator can Be informed about the proper securing of plug-in knives.

Description of drawings

Additional advantages emerge from the following description of the figures. An exemplary embodiment of the invention is shown in the drawing. The drawing, the description and the claims comprise several features in combination. A person skilled in the art can expediently examine the individual features and combine them meaningfully into other combinations. Attached are:

Figure 1: Top view of an angle grinder, and

Figure 2: An exploded view of a tool receiver with a plug-in tool.

Detailed ways

FIG. 1 shows a plan view of an angle grinder 12 with an electric motor, not shown, accommodated in a housing 44 . Via a first handle 46 that is integrated in the housing 44 on the side facing away from the plug-in tool and extends in the longitudinal direction, and is fixed on the transmission housing 48 in the region of the plug-in tool and is The angle grinder 12 can be guided perpendicularly to the second handle 50 extending in the longitudinal direction.

A drive shaft 52 can be driven by means of an electric motor and via a transmission (not shown), at the end of which the drive 14 ( FIG. 2 ) is arranged facing the insert tool. The drive device 14 has a drive flange 54 fixedly press-fitted on the drive shaft 52 on the side facing the plug-in tool and a drive flange 54 supported on the drive shaft 52 on the side facing away from the plug-in tool. The locking disc 56 on. The blocking disk 56 is displaceable in the axial direction 22 facing away from the insert tool against a centrally arranged spring element 42 formed of a helical spring.

On its side facing the plug-in tool, the locking disk 56 has three locking elements 40 distributed evenly in the circumferential direction 26, 28, each locking element being formed by a groove, and for The form-locking drive rotation has a corresponding contour to the drive flange 54 . Furthermore, three axial holes 92 , 94 , 96 distributed uniformly in the circumferential direction 26 , 28 are provided in the locking disk 56 in a radially inner region.

The drive flange 54 of the drive device 14 has three radially outwardly projecting drive elements 64 , 66 , 68 which are arranged evenly distributed in the circumferential direction 26 , 28 ( FIG. 2 ). The drive elements 64 , 66 , 68 form with their sides facing the direction of rotation 30 a drive region 72 , 74 , 76 which tapers gradually in the direction of rotation 30 . Three axial through holes 78 , 80 , 82 are provided in the radially inner region of the drive flange 54 , which are arranged evenly distributed in the circumferential direction 26 , 28 .

In the assembled state, an unlocking key 70 is inserted with its axial pins 58 , 60 , 62 into through holes 78 , 80 , 82 of the drive flange 54 ( FIG. 2 ). The pins 58 , 60 , 62 penetrate with their ends into the axial bores 92 , 94 , 96 of the locking disk 56 and are secured in these axial bores by means of hooks (not shown).

The plug-in tool has a fastening unit 10 ( FIG. 2 ) consisting of a plate hub with a closed centering hole 38 . The fastening unit 10 is fixedly connected with its outer circumference to a grinding element 84 . In its operating position, the fastening unit 10 has three plate-shaped locking elements 16 , 18 , 20 facing the drive device 14 in the axial direction 22 for fastening. The elastically deformable locking elements 16 , 18 , 20 are arranged evenly distributed in the circumferential direction 26 , 28 and are formed integrally with the fastening unit 10 by a stamping process.

The S-shaped configuration of the locking elements 16, 18, 20 each forms: a first part extending approximately in the axial direction 22 for driving rotation in the first circumferential direction 26; A second portion for fixing in the axial direction; and a third portion extending adjacent to the axial direction 22 for fixing in the second circumferential direction 28 . The locking elements 16 , 18 , 20 are designed to drive the receiving areas 32 , 34 , 36 of the drive elements 64 , 66 , 68 of the flange 54 , which taper in the direction of rotation 30 .

For assembly, the plug-in tool is slipped with its centering hole 38 on a centering flange, not shown, and is centered through the closed centering hole 38 . During assembly, the locking elements 16 , 18 , 20 protrude into the free spaces 86 , 88 , 90 between the drive elements 64 , 66 , 68 of the drive flange 54 . One rotation of the plug-in tool in the circumferential direction 28 or against the direction of rotation 30 will cause: the progressively retracted driving of the receiving areas 32, 34, 36 of the locking parts 16, 18, 20 and the driving parts 64, 66, 68 Areas 72, 74, 76 form functional connections. In this case, the displacement of the locking elements 16 , 18 , 20 towards the drive area 72 , 74 , 76 of the drive flange 54 that acts as a ramp, which gradually contracts, and the resistance of the locking elements 16 , 18 , 20 against the spring element 42 The spring force of the lock plate 56 moves in the axial direction 22.

If an end position is reached in the circumferential direction 28, the locking disc 56 is driven by the spring force of the spring element 42 in the axial direction 24 towards the drive flange 54 and the locking element 16 is moved with an audible click. , 18, 20 are positively locked in the corresponding locking part 40 of the locking disc 56 . The plug-in tool or fastening unit 10 can be secured against rotation in both circumferential directions 26 , 28 on the drive shaft 52 .

The positive engagement of the locking elements 16 , 18 , 20 with the respective locking elements 40 of the locking disk 56 prevents the plug-in tool from falling out due to the inertia when switching off. A play-free, secure holding of the fastening unit 10 in the axial directions 22 , 24 is ensured by the drive regions 72 , 74 , 76 of the drive elements 64 , 66 , 68 tapering in the direction of rotation 30 . The locking elements 16 , 18 , 20 thus secure the fastening unit 10 of the insert tool in a form-fitting manner both in the axial and in the circumferential direction 22 , 24 , 26 , 28 .

To remove the insert tool or the fastening unit 10 , the operator presses the unlocking button 70 axially in the direction of the drive flange 54 . The blocking disk 56 is displaced axially in the direction 22 away from the insert tool against the spring force of the spring element 42 . In this case, the locking elements 16 , 18 , 20 of the plug-in tool are guided out of the locking elements 40 of the locking disk 56 and released. The plug-in tool can then be rotated in the direction of rotation 30, and the drive elements 64, 66, 68 of the drive flange 54 use their drive areas 72, 74, 76 and the receiving areas 32 of the locking elements 16, 18, 20, 34, 36 are disengaged. The insert tool or fastening unit 10 can be pulled out of the drive 14 in the axial direction 24 . When the unlock key 70 is released, the key slides back to its original position.

Claims (12)

1. Plug-in tool with a fastening unit (10) formed by a hub, the plug-in tool for a machine tool (12) provided with a drive (14), wherein, The fastening unit (10) has in an operating position at least one locking element (16, 18, 20) for fixing directed towards the drive device (14), whereby the locking element (16, 18, 20) A form-fitting fixing of the fixing unit (10) in the axial direction (22, 24) and in the circumferential direction (26, 28) can be achieved, characterized in that the locking element (16, 18, 20) is configured S-shaped, wherein the locking member (16, 18, 20) has a first portion approximately extending axially for fixation in a first circumferential direction (26), has a substantially vertically connected The second part on the first part is used for fixing in the axial direction (22, 24), and has a third part extending approximately in the axial direction away from the first part for fixing in the second circumferential direction (28 ) on the fixed. 2. Plug-in tool according to claim 1, characterized in that the locking element (16, 18, 20) is formed in one piece with the fastening unit (10). 3. Plug-in tool according to claim 1 or 2, characterized in that the locking element (16, 18, 20) is elastically deformable. 4. The plug-in tool according to claim 1 or 2, characterized in that the locking element (16, 18, 20) is formed in the form of a plate. 5. Plug-in tool according to claim 1 or 2, characterized in that the locking element (16, 18, 20) forms a receiving area (32, 34, 36) which tapers gradually in the direction of rotation (30) . 6. Plug-in tool according to claim 1 or 2, characterized in that the fastening unit (10) has a centering hole (38). 7. The plug-in tool as claimed in claim 1 or 2, characterized in that the plug-in tool is used in a hand-operated angle grinder. 8. Tool holder, characterized in that it is used for a plug-in tool according to one of the preceding claims. 9. The tool holder according to claim 8, characterized in that a corresponding locking element (40) of the tool holder is displaceable against a spring element (42). 10. The tool holder according to claim 8 or 9, characterized in that: there is provided an unlocking key (70) which can be pressed axially by the operator in the direction of the drive flange (54) of the fixed unit (10), For removing plug-in tools. 11. Tool holder according to claim 8 or 9, characterized in that a drive element (64, 66, 68) is provided with a drive area (72, 74, 76) which gradually shrink. 12. Tool holder according to claim 9, characterized in that the corresponding locking element (40) of the tool holder is formed by a groove.

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