EP2777885B1 - Device for removing a drill bit which is stuck in masonry, concrete or the like - Google Patents

Description

The invention relates to a device for releasing a stuck masonry, concrete or the like drill bit.

Such a device is for example from the DE 20105277 U1 known. There, a so-called flying chamber for loosening, pulling and Unclamping stuck Bohrkronenrohren in masonry / concrete is disclosed, which consists of a guide member which can be screwed into the drill bit, wherein on the guide member a movable provided with handles, plate-like weight is disposed of the drill bit can be accelerated away towards an end stop.

When hitting the gripped, plate-like weight on the stop should be due to the impact energy acting on the drill bit, the latter of masonry / concrete solve.

In the prior art, it is considered disadvantageous that the dissolution process is associated with a relatively large amount of physical work, especially in the vertical arrangement of the device and also a certain risk exists that body parts - such as fingers or the like - between the weight and the stop advised.

From the US Pat. No. 7,036,211 B1 In addition, there is known a pneumatically driven pulling tool which is arranged on frictionally fastened connecting elements and has a movable from the connecting element in the direction of a stop weight, wherein the pneumatic drive means is designed as a disposed within an elongated cavity weight, the is accelerated from a position near the connecting element in the direction of the stop.

Furthermore, from the US 4,495,791 a likewise pneumatically driven drawing tool for the buckling of sheet materials known. In this case, a thread crest is screwed into the area to be eroded and also accelerates pneumatically counter to a spring force a weight of the point to be exempted to a stop.

Ultimately, out of the US 2010/0331851 A1 and the US 2,337,971 each known a surgical instrument, can be removed with the fasteners for artificial dentures or dental technical elements, such as bridges. The disclosed in the aforementioned publications devices are each connected to a member to be solved, wherein in the devices, a weight is accelerated by a spring away from the object to be solved in the direction of a stop, whereby a tensile force is exerted on the object to be solved.

Based on the first-mentioned prior art, the object of the invention is to provide a device for releasing a stuck masonry, concrete or the like drill bit, which ergonomically and safety is more advantageous.

The solution of the problem arises from the features of claim 1.

In the device according to the invention, a compression spring is arranged between the weight and the drill bit-side end region of the hollow body, wherein the weight is arranged by means of a latter Gripping element which is guided in a slot of the hollow body, against the spring force in a clamping and / or locking position is movable.

Advantageously, in the case of use, the weight can be accelerated by means of the tensioned compression spring in a fairly simple manner in the direction of the stop and thus a sufficient impact energy to release the drill bit can be generated. Also, when the device is tensioned - at least when the device is arranged vertically - the body weight can advantageously be used. In addition, the weight within a longer hollow body is arranged so that the risk of injury during use of the device is significantly reduced.

An embodiment is characterized in that the elongated cavity is tubular.

In a further advantageous embodiment of the invention, the drive device is designed as attachable to the hollow body compressed air supply device, preferably compressed air cartridge, formed by the between the drill bit side end portion and the weight of a sudden, the movement of the weight causing overpressure.

In this device, the tensioning of the spring, which acts as a drive device, is no longer necessary and ultimately to accelerate the weight in a very simple way away from the drill bit in the direction of the stop.

• Fig. 1 eine Darstellung einer Vorrichtung zum Lösen einer im Mauerwerk, Beton oder dergleichen festsitzenden Bohrkrone im gespannten Zustand,
• Fig. 2 eine Draufsicht auf die Vorrichtung gemäß Fig. 1,
• Fig. 3 eine Darstellung einer Vorrichtung zum Lösen einer im Mauerwerk, Beton oder dergleichen festsitzenden Bohrkrone im ungespannten Zustand und
• Fig. 4 eine Teilseitenansicht der Fig. 3 gemäß Ansicht IV in Fig. 3.

Further advantages of the invention will become apparent from the following description of an embodiment. Show it:

• Fig. 1 a representation of a device for releasing a stuck masonry, concrete or the like drill bit in the tensioned state,
• Fig. 2 a plan view of the device according to Fig. 1 .
• Fig. 3 an illustration of a device for releasing a stuck masonry, concrete or the like drill bit in the untensioned state and
• Fig. 4 a partial view of the Fig. 3 according to view IV in Fig. 3 ,

In the drawings, a device for releasing a stuck in masonry, concrete or the like drill bit is generally designated by the reference numeral 10.

Such a device 10 has a tubular, elongated hollow body 11, the Bohrkrronenseitig with a threaded connector 12 and at the other end with a cap 13 - hereinafter referred to as a stop 13 - is provided which forms the stop for the weight 15. Within the tubular hollow body 11, a compression spring 14 is arranged on the threaded nozzle side, to which a weight 15 adjoins, which is provided with a grip element 16, which is arranged movably within a guide 17. The guide 17 has a threaded position on the threaded side 18 (s. Fig. 2 ).

In the Fig. 1 it can be seen that the device 10 is screwed into a stuck in the concrete 19 Bo crown 20, wherein also in a manner not shown, the connection between the device 10 and the drill bit 20 can be done by means of a quick release coupling.

To release the drill bit 20 in the concrete 19 now only the handle member 16 with its rotatably arranged in the tubular hollow body 11 weight 15 must be moved in the direction of arrow x. As soon as the grip element 16 is in alignment with the guide 17, the weight 15 is accelerated by the relaxing compression spring 14 in the direction of the stop 13, the impact energy resulting from the impact of the weight 15 on the stop 13 leading to the release of the drill bit 20 ,

The Fig. 2 shows in addition, as the grip element 16 protrudes from the contour of the tubular hollow body 11.

In the Fig. 3 the resulting situation is shown with a relaxed compression spring 14. Optionally, if the loosening of the drill bit 20 has not yet been successfully achieved, the device 10 can be tensioned once more by moving the handle element 16 together with the weight 15 against the force of the compression spring 14 in the y-direction into the clamping position 18 emotional.

LIST OF REFERENCE NUMBERS

10

contraption

11

tubular hollow body

12

threaded connector

13

Cap / stop

14

compression spring

15

Weight

16

handle element

17

guide

18

clamping position

19

Concrete / masonry

20

drill bit

X

movement direction

Y

movement direction

Claims (3)

1. Device (10) for releasing a drill bit (20) which is stuck in masonry, concrete or the like, which device is arranged in a detachable manner on the drill bit (20) and has a weight (15) which can be moved towards a stop (13) from said drill bit (20), with a driving apparatus (14) by which the weight (15) can be accelerated, inside an elongated hollow body (11), in the direction of the stop (13) from a position located close to the drill bit (20), wherein a compression spring (14) is arranged between the weight (15) and the end region of the hollow body at the drill bit end, and that the weight (15) can be moved, against the spring force, into a clamping and/or latching position (18) by means of a handle element (16) which is arranged on said weight and is guided into a guide slot (17) in the hollow body (11).
2. Device according to Claim 1, characterised in that the elongated hollow space (11) is of tubular construction.
3. Device according to Claim 1 or 2, characterised in that the driving apparatus is constructed in the form of a compressed air-supplying apparatus, preferably a compressed air cartridge, which can be fastened to the hollow body (11) and by which a sudden overpressure, which causes the movement of the weight (15), can be generated between the end region at the drill bit end and said weight (15).

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