DE102010003842A1 - Arrangement for mounting a drill - Google Patents

Abstract

An arrangement is proposed with the aid of which drills which are simply constructed and can be produced with less effort can be used with conventional drills and / or impact drills. The arrangement contains an adapter, the shaft of which has a possibly complicated design of a known insertion system. The adapter contains opposite a receptacle with a cylindrical inner shape corresponding to a cylindrical outer shape of the clamping end of the drill. To axially secure the inserted drill, a locking device is provided which interacts with a notch in the clamping end of the drill.

Description

The invention relates to an arrangement for mounting a drill, in particular a hammer drill, on a drill.

For attachment of beating and rotating tools to the associated drive machines usually a plug-in system is used, which is known under the name SDS. The insertion of the drill has two longitudinal depressions which are closed on both sides. These depressions are made by milling. Even the drills themselves are usually produced by machining processes. As a result, such drills are expensive to manufacture.

For releasably attaching polygonal shaft ends of tools, a chuck is known, which can be screwed to a spindle of a drill. This chuck is provided as part of the drill ( EP 462257 ).

Recently, it has been proposed to produce drills by extrusion molding and spiral pressing. The SDS recording on the clamping end must also be made by machining process, so that the actual advantage of the simple production of the drill is canceled again.

The invention is based on the object to provide a way to simplify the production of drills while maintaining the advantages of the known Einstecksysteme.

To solve this problem, the invention proposes an arrangement with the features mentioned in claim 1. Further developments of the invention are the subject of the dependent claims.

The arrangement proposed by the invention thus uses an adapter which is adapted with its own shank to the inclusion of the drill or percussion drill. The drill itself then does not need to have the possibly complicated to manufacture configuration for receiving the drill, but may have a simpler molded and produced by simple measures shaft. The elaborate production of the adapter is compensated by the fact that the adapter then has a very long life, while the much cheaper drill is disposed of after his due to wear end of his life. To transmit the rotational movement between the adapter and the drill is the non-circular cross-sectional shape of the shaft of the drill and the inclusion of the adapter. In order to prevent the drill slips out of the exception, the locking device is provided, which causes the shank of the drill is axially secured in the adapter.

In particular, it can be provided that the shank of the drill has a constant cross section with the exception of the notch over the length of its clamping area. Such a constant cross section can be produced very easily.

In a further development of the invention it can be provided that the locking device has at least one locking element which can be engaged in the notch of the shaft of the drill. It can also be pulled out of the notch to release the drill.

For axial securing the locking device may be formed such that the locking element is acted upon by spring action so that it is engaged with inserted drill in the notch. If subjected to spring action, the drill can be removed from the receptacle by forceful pulling if necessary.

But it is also possible that the locking element in the engaged position, in which it is engaged in the notch of the shaft of the drill, mechanically fixed, for example by a blocking element. Then the drill can not be removed by strong pulling from the recording. Of course, combinations of the two described types of action or determination are possible.

In development of the invention can be provided that the notch is formed in a flat surface of the shaft of the drill, or that the notch is rectilinear.

In order to create a particularly universal arrangement, can be provided according to the invention in a further development that the notch is formed on all sides of the shaft of the drill, in particular designed as a circumferential notch. Then there is no need to pay attention to the correct orientation when inserting the drill into the receptacle of the adapter, if there are several orientations for the insertion of the drill.

As particularly useful, it has been found that the shank of the drill is designed as a hexagon. Then can be used in the recording of the adapter element, which is also meaningful hexagonal, also use the usual screwdriver bits. If with a drill so a dowel hole to be drilled, which is indeed a common area of application for a hammer drill, then the assembly of the fastened object with a screw. To screw in the screw, the drill can then simply be exchanged for a bit and the same drill can then be used as a screwdriver.

Of course, other shapes of the cross section of the shaft and the receptacle are possible, for example, alternately concave and convex curvatures of the boundary surface.

With a hex shaft, the notch may be formed in all six sides without unduly weakening the shaft.

According to the invention it can be provided that at least one locking element is designed as a pin whose axis extends transversely to the longitudinal axis of the shaft or the receptacle. This pin, for example, a simple round pin, then engages in the notch. When the latch is released, it is simply pushed outward by pulling on the drill.

According to the invention can also be provided that at least one locking element is designed as a ball. The ball also has the advantage that due to its shape it can be disengaged from the notch by pulling on the drill.

It has already been mentioned that the locking element is acted upon by spring action in the notch and / or is held by a mechanical lock in the notch. The spring effect can be so strong that it can not be overcome by pulling on the drill. The same may also occur if the locking element and / or the notch are formed accordingly.

In order to facilitate the release of the drill or only to enable, according to the invention in a further development, the locking means comprise an actuating element, which optionally also serves to effect the axial securing only. It makes sense also the actuator is spring loaded to move it into the blocking position.

According to the invention it can be provided that the actuating element is movable, for example rotatable, but preferably axially movable. For a tool that is inserted axially and removed axially, this is the most ergonomically sensible type of movement.

According to the invention, the actuating element may be formed as a sleeve which surrounds the part of the adapter which forms the receptacle on the outside. Between the sleeve and the receiving part of the adapter can be formed by a gap, which lends itself to the arrangement and placement of both the spring and the at least one locking element. It makes sense for the spring to act on the locking element also for acting on the actuating element.

In a further development of the invention can be provided that the actuating element is profiled, the direction of the profiles, if they are linear, expediently transverse to the direction of movement of the actuating element.

It was already pointed out at the beginning of the widespread SDS insertion system. The invention is also applicable to other complicated built-insertion systems, but especially in the SDS system. Therefore, it is provided that the shaft of the adapter is designed as an SDS system.

The invention also proposes the use of an adapter whose shaft is designed as an SDS system and whose receptacle has a hexagon, for attaching hammer drills on impact drills with SDS recording before.

Further features, details and advantages of the invention will become apparent from the claims and the abstract, the wording of which is incorporated by reference into the content of the description, the following description of preferred embodiments of the invention and with reference to the drawing. Hereby show:

1 the side view of an adapter as part of the arrangement proposed by the invention;

2 a longitudinal section through the adapter of 1 along line II-II in 1 ;

3 a side view of a second adapter from a different direction than in 1 ;

4 a longitudinal section through the adapter of 3 along line IV-IV in 3 ;

5 the side view of a hammer drill according to the present invention;

6 the side view of a screwdriver bit for use in an adapter according to the present invention.

First to 5 in which a hammer drill is shown, as proposed by the invention. The hammer drill has a drill section 1 on, by helical grooves arranged 3 is marked. At his free end 2 may be arranged a cutting head, which is not shown here for reasons of simplicity. These grooves 3 can be produced by so-called spiral presses. According to the invention is now at the in 5 lower chucking end of the drill a chuck end 4 produced by forming. This clamping end 4 is formed hexagonal, so the cross-sectional shape corresponds to a hexagon with six equal sides. Approximately in the middle of the chuck end 4 is a circumferential notch 5 formed, which is rectilinear in both the side view and in cross section. This drill can thus be produced in total by forming with a very low machining post-processing.

In 6 is a screwdriver bit 6 represented, the clamping end 7 the same shape and size as the clamping end 4 of in 5 illustrated drill. So this clamping end also contains a circumferential notch 5 , which has the same shape and size as the notch 5 of the chuck end 4 of the drill in 5 ,

Now to the adapter element in 1 and 2 , This adapter element has a shaft 8th on, which is intended for an SDS recording. The shaft end 10 has two grooves open towards the end 9 on. These two grooves 9 are arranged diametrically and have the same length. Center between the open ends of the grooves 9 are two closed end depressions 11 arranged, as well as the grooves 9 be made by machining. To the shaft 8th closes the adapter body 12 At the core 13 and one the core 13 surrounding sleeve 14 having. In the core 13 is a cylindrical receptacle 15 trained, see 2 , In the example shown, the recording 15 a hexagon cross section on and ends in a bottom 16 , At two opposite points of the recording 15 There are perforations in the wall, through each of which a pin 17 into the interior of the recording 15 protrudes over part of its circumference. The two pens 17 are arranged so that their longitudinal axis transverse to the plane of the 2 runs. At their ends the pins protrude 17 then from the outside 18 of the core 13 out.

At the core 13 is the sleeve 14 placed. After placing the sleeve 14 she gets through a snap ring 19 secured, pulling her off to the right in 1 and 2 prevented. Between the inside of the sleeve 14 and the outside 18 of the core 13 the adapter is a gap 20 educated. In this space 20 is a compression spring 21 arranged at one end on one shoulder 22 of the core 13 supported. Her other end impinges on a ring 23 which is also between the core 13 and the sleeve 14 is arranged. This ring lies on both ends of the pins 17 on, also in the gap 20 protrude.

In the outside 18 of the core 13 of the adapter are two slanted slots 24 trained in which the pins 17 lie. The slots end up for recording 15 in the already mentioned openings, these openings are smaller than the diameter of the pins 17 , In the position shown, the spring acts 21 The ring 23 that with the pins 17 so far in the slots 24 push in as possible. Now you push into the recording 15 a drill out 5 or a screwdriver bit 6 into it, so the pins are due to their round cross-section of the end of the chuck end 4 respectively 7 pushed outward, something by the spring 21 is allowed. As soon as the score 5 reaches the point of breakthroughs pushes the spring 21 The ring 23 something to the right and thus the pins 17 in the notches 5 into it. The pins are in the notches 5 on two opposite sides of the chuck end 4 respectively 7 along the entire length of the respective notch 5 at.

For easier removal of the screwdriver bit or the drill, the sleeve 14 which is an actuator for the pins 17 comprising locking means, are pushed to the left, so that the spring pressure on the pins 17 will be annulled. Then the drill can be pulled out.

The 3 shows a side view of an adapter, which is externally constructed as the adapter of 1 and 2 , however, shows the 3 him from another direction, so now the recess 11 can be seen more clearly. In the recording 15 of the core 13 this adapter are now in the walls six openings 25 formed in the form of holes. There are bullets in these holes 26 who assume the role of locking elements this time. The sleeve 34 now has a blocking section 27 in which they are on the outside 18 of the core 13 is applied. Right from this blocking section 27 is an oblique surface 28 formed, from where it then again a gap between the outside 18 of the core 13 and the inside of the sleeve 34 gives. In the illustrated position, the blocking portion is located 27 on the outside of the balls 26 at. The diameter of the balls 26 is greater than the wall thickness of the core 13 so that the inside of the balls 26 into the interior of the recording 15 protrude. Will the sleeve 34 against the action of the spring 21 moved to the left, so can the balls 26 pass radially outward so that they are no longer in the interior of the receptacle 15 protrude. As a result, a seated in the recording drill is released.

Both the sleeve 14 as well as the sleeve 34 refer to a circumferential profiling. The direction of displacement of the sleeve is axial. A turn is also possible. But only the axial displacement leads to the release of the locking device.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 462257 [0003]

Claims (19)

Arrangement for attaching a drill to a drill, with 1.1 an adapter 1.2 a shaft ( 1 ) for connection to the receptacle of the drill, 1.3 a cylindrical non-circular in cross section recording ( 15 1) has a shank of the drill of equal cross-sectional shape and cross-sectional size, and 1.4 has a locking device for axially securing the shank of the drill against withdrawal, wherein 1.5 the shank of the drill may have a transverse notch (Fig. 5 ) for cooperation with the locking device of the adapter. Arrangement according to Claim 1, in which the shank of the drill has one with the exception of the notch ( 5 ) over the length of its clamping area ( 4 ) has constant cross-section. Arrangement according to claim 1 or 2, wherein the locking device at least one in the notch ( 5 ) of the shaft of the drill has engageable locking element. Arrangement according to claim 3, wherein the locking element under spring action ( 21 ) in the notch ( 5 ) is acted upon. Arrangement according to claim 3, wherein the locking element is mechanically fixable in the engaged position. Arrangement according to one of the preceding claims, in which the notch ( 5 ) is formed in a flat surface of the shaft of the drill. Arrangement according to one of the preceding claims, in which the notch ( 5 ) is formed on all sides of the shaft of the drill, in particular circumferentially. Arrangement according to one of the preceding claims, in which the shank of the drill is a hexagonal shank. Arrangement according to one of claims 3 to 8, wherein at least one locking element as a pin ( 17 ) is formed, which transversely to the longitudinal axis of the receptacle ( 15 ) is arranged. Arrangement according to one of claims 3 to 9, wherein at least one locking element as a ball ( 26 ) is trained. Arrangement according to one of claims 3 to 10, wherein the locking element is arranged transversely to the longitudinal axis movable. Arrangement according to one of the preceding claims, wherein the locking means comprises an actuating element at least for releasing the axial securing of the shaft of the drill. Arrangement according to Claim 12, in which the actuating element is spring-loaded ( 21 ). Arrangement according to claim 12 or 13, wherein the actuating element is axially movable. Arrangement according to one of claims 12 to 14, wherein the actuating element of a sleeve surrounding the adapter ( 14 . 34 ) is formed, between which and the adapter, the spring is arranged. Arrangement according to one of claims 12 to 15, wherein the actuating element is profiled. Arrangement according to one of the preceding claims, in which the shaft ( 8th ) of the adapter is designed as an SDS system. Use of an adapter with the features relating to the adapter according to one or more of the preceding claims for mounting a drill on a drill with SDS receptacle. Adapter, with a shaft ( 1 ) for connection to the receptacle of a drill or the like, a cylindrical non-circular in cross section recording ( 15 ) for a shaft having a same cross-sectional shape and cross-sectional size of a drill and a locking device for axially securing the shaft of the drill against pulling out.

Images