JPH07214406A - Tool holder - Google Patents

Abstract

(57) [Abstract] [Purpose] To enable easy handling of a tool holder and to configure the tool holder with a small number of parts in order to simplify finishing and assembly. A locking member (3) slidable in the through hole (17) is therefore pivotally attached to the spring end (5a) of the free and soft spring (5) to bias the spring (5). With respect to the partial winding (5b) of the spring (5) which is in contact with the slide sleeve (2) under the condition, the tool shaft (13) can be inserted to return axially to the rear.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder for automatically connecting a hammering or rotating tool, especially in a hand-held tool machine such as a hammer drill and / or a breaking hammer, which comprises a base sleeve, A slide sleeve axially slidable with respect to the base sleeve, said base sleeve being non-rotatably connected on the one hand to the drive member of the hand-held tool machine for transmitting the working movement and on the other hand receiving the tool shaft. The tool shaft has at least one groove-shaped notch that is closed on both sides in the axial direction, and the notch slides into the through hole of the substrate through-hole. At least one locking element arranged so that it is engageable, said slide sleeve being pressed by a spring against a stopper located at the tool end of the tool holder On things.

[0002]

BACKGROUND OF THE INVENTION Many variations of tool holders of this kind are known in the prior art.

For example, German Patent No. 32 05 063
The specification discloses a tool carrier which is just as satisfactory in its functional form. In this case, the locking member is a sphere, which in its non-working position is prevented from radial movement by a part of the disc sleeve. During installation of the tool shaft, the sphere is pressed by the end of the tool shaft towards the spring-loaded ring. The sliding of the ball and ring is done against the force of the spring, the ball is also slid and displaced radially against the part of the sliding sleeve that blocks the ball, and then the groove notch in the tool shaft. Can be locked to. For unlocking the tool, the disk sleeve is slid against the drive member against its own spring force, so that the sphere again radially displaces the sliding sleeve, which is now blocked on the tool side. Is able to. In order to prevent inadvertent unlocking of the tool, the spring must be correspondingly stiff. However, this means that a large force is required to slide the ball and ring against the spring force when inserting the tool, and the user must transfer this force through the tool. I won't. In other words, the tool holder according to this specification cannot be handled comfortably. The known tool holder has the disadvantage that it has a large number of parts, which makes it expensive to finish and assemble.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is therefore to improve the tool holder of the type mentioned at the beginning, to make it easier to handle and to reduce the number of parts in order to simplify the finishing and assembly. To be able to be configured.

[0005]

SUMMARY OF THE INVENTION In the present invention, a locking member slidable within a through hole is pivotally attached to the spring end of a free, soft spring to abut the sliding sleeve under the bias of the spring. The above problem can be solved by being configured to be able to return to the rear side in the axial direction by inserting the tool shaft with respect to the partial winding of the spring in contact.

[0006]

When inserting the tool, the locking member is only slid against the slight force of the soft spring, while inadvertent sliding of the slide sleeve is prevented by the total force of the hard spring. ing. By changing the structure and pivoting the spring end directly to the locking member, it is no longer necessary to provide a ring. Since the through hole extends obliquely, it is possible to allow the movement of the locking member guided in the radial direction outward during the mounting of the tool without sliding the slide sleeve, On the other hand, movement of the tool in the opposite direction can prevent this.

Other advantageous configurations of the tool carrier according to the invention can be inferred from the description of the following examples and the features set forth in claims 2 and below.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENT The drawing shows an advantageous embodiment of the invention.

In the drawing, of the hammer drill not shown, only the drive member 6 projecting from the casing is shown. This drive member 6 has the shape of a tool spindle performing a striking or rotating movement. The drive member 6 has at its free end, which projects from the casing of the hammer drill, a device for the transmission of rotational moments in the form of an outer wedge axis contour. This outer wedge shaft contour is turned at a right angle by a ring groove 8 extending around the outer circumference of the front end of the drive member 6, the depth of which corresponds to the groove depth of the outer wedge shaft contour. There is. A flat stopper surface 9 is formed on the end surface of the drive member 6.

The tool holder mainly consists of a base sleeve 1, on the outside of which a slide sleeve 2 which is axially movable is guided. The slide sleeve 2 is made of metal or plastic. The base sleeve 1 is
2 with different diameters, axially interconnected
It has one receiving hole. The rear, large-diameter hole on the opposite side of the drill hammer is for receiving the drive member 6, and the second small-diameter hole opening at the other front end is It is a hole for receiving the tool shaft 13.

An inclined hole 11 is arranged in an end region of the base sleeve 1 on the machine side, and the driving member 6 is provided in the hole 11.
A lock ball 12 is slidably arranged as a connecting member for connecting the base sleeve 1 and the base sleeve 1. The locking ball 12 engages the ring groove 8 of the drive member 6 and locks the base sleeve 1 to the drive member 6 in this manner. The base sleeve 1 has an outer peripheral groove 18 in its outer peripheral region in which the inclined hole 11 is provided, and the end portion 5c of the conical compression spring 5 having the smaller diameter is immovable in the outer peripheral groove 18. It is fixed to. The lock ball 12 is fixed in the outer peripheral groove 18 by the end portion 5c of the compression spring 5 and the inclined hole 1
Protected from slipping from 1. Since the ring groove 8 has a sufficient width, the base sleeve 1 has a predetermined degree of freedom in the axial direction with respect to the drive member 6.

To receive a given tool shaft 13 in the tool holder, the tool shaft 13 has a flat stop surface 7 with a chamfered corner at its rear end, which stop surface 7 is driven axially. It is in contact with the stopper surface 9 of the member 6. The axial impact is transmitted from the drive member 6 onto the tool shaft 13 via the two stopper surfaces 7, 9 which are in contact with each other. It is possible to use both known tools with the tool carrier according to the invention, as well as those described, for example, in DE 32 05 063. On the outer surface of the tool shaft 13 of such a known tool, which is located diagonally opposite to each other, two groove-shaped closed notches 15 are provided on both sides in the axial direction. On the diagonal perpendicular to the notch 15, the tool shaft 13 is additionally provided with two oppositely facing rotary drive grooves 19 which are open and open at the end of the shaft. A corresponding rotary drive is engaged in the receiving hole of the base sleeve 1 in the drive groove 19. Figure 2
As is apparent from the above, when the tool is inserted, the locking member 3 slidably arranged in the through hole 17 of the base sleeve 1 engages with the notch 15. Through hole 17
Is an inclined hole, the outer opening of which is located near the machine-side end and the inner opening of which is located near the tool-side end of the base sleeve 1. The locking member 3 is a pin, and the inner chamfered end of the locking member 3 has a tool shaft 13
To the free soft spring end 5a of the conical compression spring 5. Therefore, the eye 10 is provided on the outer end of the locking member 3.
Is formed, and the spring end 5a penetrates the eye 10.
Has been captured. The spring end 5a is configured to be able to return axially rearward to the partial winding 5b of the compression spring 5 that is in contact with the slide sleeve 2 while receiving the bias of the compression spring 5. The force required for this is significantly less than the bias of the compression spring 5. Since the bias is transmitted to the slide sleeve 2 via the partial winding 5b, it is mainly necessary to overcome the bending stress of the spring end 5a. A protective cap 4 is provided on the tool-side end of the base sleeve 1, and the protective cap 4 serves as a stopper for the slide sleeve 2 and also protects dust. The slide sleeve 2 is
It is held in contact with the protective cap 4 by the compression spring 5 via the rib 2a.

FIG. 1 shows a tool insertion form by inserting the tool shaft 13 into the tool holder. The tool shaft 13 has a chamfered corner at its end, and the rounded chamfered inner end of the locking member 3 rides on the chamfered corner. The locking member 3 is then slid outwards in the through hole 17 against the relatively small spring force of the soft spring end 5a.

As is apparent from FIG. 2, after the tool shaft 13 is completely pushed in, the through hole 17 comes to face the notch 15 of the tool shaft 13, and the locking member 3 is soft. The slight pressure of the paddle spring end 5a penetrates the inclined hole of the through hole 17 and is pressed by the groove-shaped notch 15. That is, the locking member 3 is the tool shaft 1
3 is locked in the tool holder, and the tool shaft 3 itself can be slightly moved in the axial direction. Both during the setting operation of the tool and during the insertion of the tool, the slide sleeve 2 itself is held in contact with the protective cap 4 except for the end 5a of the hard compression spring 5. When the tool is set, that is, when the locking member 3 is locked in the groove-shaped notch 15, the tool itself is pulled out by applying a tensile force to the tool, whereby the through hole 17 is inclined. The tool-side surface 17a acts as a locking surface for the locking member 3.

In order to remove the tool, as shown in FIG. 3, the slide sleeve 2 is slid towards the machine side against the pressing force of the conical spring 5 and, at the same time, compressed by the compression spring 5. The spring end 5a is also slid backward. At the same time, the spring end 5 a pulls out the locking member 3 from the through hole 17. This releases the front hole of the base sleeve 1 and allows the tool to be pulled outward by a pulling force.

Due to the different spring force acting on the slide sleeve 2 and the spring force acting on the locking member 3, insertion of the tool is possible without consuming power, while the tool is not intended. The release is blocked by the sliding of the slide sleeve 2. The inclination of the through hole 17 enables the locking member 3 to be pulled back by the sliding of the slide sleeve 2, and at the same time, when the slide sleeve 2 does not slide, it serves as a lock member against pulling out of the tool. . The inventive construction of the tool holder requires a smaller number of individual parts and significantly less complex molding of the individual parts compared to prior art tool holders. That is, for example, it is not necessary to mold or attach a lock member for the locking member 3 to the slide sleeve 2. The known tools can thus be used with this tool carrier, in which case they show only a slight imbalance even at high speeds of rotation.

The invention is not limited to the illustrated embodiment, but can also be used in the case of hand-held tool machines, in particular hammer drills and / or breaking hammers, in which case the base sleeve 1 and the drive member 6 are used. They are linked together in different ways. That is, for example, it is conceivable to screw the base sleeve 1 and the drive member 6 together, or to form the base sleeve 1 and the drive member 6 in one body. In this case, the drive member 6 is hollow so that it can engage the striking body. In particular, the invention relates to a combination tool holder, in which a tool holder for a round shaft tool configured as a jaw chuck is additionally provided to the tool holder for a grooved shaft tool according to the invention described. Can also be used in the case of.

[Brief description of drawings]

FIG. 1 is a view of a tool holder of the present invention when inserting a tool.

FIG. 2 is a view of the tool holder of the present invention when a tool is inserted.

FIG. 3 is a view of the tool holder of the present invention when removing a tool.

[Explanation of symbols]

 1 Base Sleeve 2 Slide Sleeve 3 Locking Member 4 Protective Cap 5 Compression Spring 5a Spring End 5b Partial Winding 5c End 6 Drive Member 7 Stopper Surface 8 Ring Groove 9 Stopper Surface 10 Eye 11 Hole 12 Lock Ball 13 Tool Axis 15 Cut Notch 17 Through hole 17a Surface 18 Outer peripheral groove 19 Rotational entrainment groove

Claims (5)

[Claims] 1. A tool holder for automatically connecting hitting or rotating tools, especially in hand-held tool machines such as hammer drills and / or breaking hammers, comprising a basic sleeve (1) and a base sleeve (1). 1) is provided with a slide sleeve (2) slidable in the axial direction, the base sleeve (1) on the one hand being non-rotatable by a drive member (6) of a hand-held tool machine for transmitting working movements. Combined and, on the other hand, is formed to receive a tool shaft (13), said tool shaft (13) having at least one groove-shaped cutout (15) closed on both sides in the axial direction. The notch (15) has a through hole (17) in the base sleeve (1).
At least one locking member (3) slidably arranged therein is engageable, said slide sleeve (2) being fitted by a spring (5) into a stopper located at the tool end of the tool holder. In the type pressed against, the locking member (3) slidable in the through hole (17) has a spring end (5a) of a free and soft spring (5).
Axially by insertion of the tool shaft (13) with respect to the partial winding (5b) of the spring (5) which is pivotally attached to the spring (5) and is in contact with the slide sleeve (2) under the bias of the spring (5). A tool holder characterized by being configured to be able to return to the rear. 2. A through hole (17) in the basic sleeve (1).
Tool holding according to claim 1, characterized in that it extends obliquely with respect to the axis of the base sleeve (1) and towards the tool-side end of the tool holder towards the end. body. 3. The spring (5) is a conical compression spring,
Drive end (5c) having its smaller diameter
Is fixedly located in the base sleeve (1), in particular in the circumferential groove (18).
Tool holder described. 4. A base sleeve (1) with a circumferential groove (18).
Is interrupted by an opening (18) in the
Tool holder according to claim 3, characterized in that 1) is provided for mounting a coupling member (12) for coupling the base sleeve (1) and the drive member (6). 5. An eye (10) is formed on the outer end of the locking member (3), and the spring end (5a) of the spring (5) is engaged through the eye (10). Tool holder according to any one of claims 1 to 4, characterized in that