DE29506880U1 - Drilling head of a hollow auger - Google Patents

Description

A 214 PA Schönherr / Serwe' ' " *' ··'···"

Description:

Reporter: A.B.F. - technology

To the Black Bridge

0-54516 Wittlich Description: Drill head of a hollow boring auger

The innovation concerns a drill head of a hollow auger. Hollow augers are used to drill holes in the ground, for example to create bored piles, to insert supports for support pile walls, or similar. When using such hollow augers, which can have different inner diameters depending on the work to be carried out and the type of soil, it must be avoided that mud or soil gets into the interior of the auger during the drilling. It was therefore proposed that the lower open end of the central drill pipe on the auger drill head be fitted with a plate that remains in the ground after the auger has been unscrewed.

Another closure option involves a relatively complex twist-lock tip, which is opened by turning the screw against the drilling direction, but this is only guaranteed as long as the ground offers resistance to the twist-lock opening mechanism.

A 214 PA Schönherr / Serwe

The aim of the innovation is to design a drill head in such a way that no lost plate remains in the ground when the drill pipe is pulled out, that it can be used in different types of soil and that its structure is simple so that it can be easily opened without additional equipment when the hollow drilling auger is unscrewed.

To solve this problem, the drill head is characterized by a conical drill head tip with at least two outwardly pivoting segment parts of the cone shell designed as flap parts.

Advantageously, a driver lug is arranged on the flap part to absorb the torque.

To lock the flap part in the open and closed position, a spring-loaded bolt is preferably effectively connected to the bearing of the flap part that holds the pivot axis.

According to a further advantageous embodiment, a chisel-like cutting element is arranged on the outside of the flap part. The drill head with arranged drill head tip can advantageously be detachably connected to the auger.

The innovation is shown as an example in the drawings. They show:

Fig. 1 a drill head in closed position in side view,

Fig. 2 the drill head according to Fig. 1 in open position,

A 214 PA Schönherr / Serwe

Fig. 3 the drill head according to Fig. 2 in plan view,

Fig. 4 a hollow auger with drill head after the innovation.

The drill head according to Figures 1 to 4 consists of a base body 1, which has a conical drill head tip 2 at one end and can be connected to a hollow auger tube 3 at its other end.

The conical drill bit 2 has two segment parts 4 and 5, which are designed as flap parts and can each be pivoted outwards about an axis 6. The pivot axes 6 are mounted at the end of the flap closure base body 1.

A driver lug 7 for holding the torque is arranged on the flap part 4 or 5. A chisel-like cutting element 8 is attached to the outside of the flap part 4 or 5.

To lock the flap parts 4 and 5 in the open and closed position, a bolt 9 is arranged on the flap closure base body 1, which is effectively connected to the bearing 10 of the pivot axis 6. The bolt 9 is pressed against the bearing 10 by a compression spring 11.

The drill head can be permanently welded to the auger pipe 3 or detachably connected by a socket-pin plug connection.

The hollow auger equipped with the new drill head can be screwed into the ground in a conventional manner. The drill head tip 2 is opened depending on the inner diameter of the auger, after the desired drilling depth has been reached, by the weight of the

A 214 PA Schönherr / Serw'e

filled material, e.g. filter pipe and filter gravel, reinforcing iron, support liquids, supports, etc., after the entire screw has been raised. If the weight of the filling material is too low, a reinforcing iron rod can be used to open the drill tip in order to overcome the clamping resistance of the flap parts.

Claims (5)

A 214 PA Schönherr / Serwe Protection claims: 1. Drill head of a hollow drilling auger, characterized by a conical drill head tip (2) with at least two outwardly pivotable segment parts (4, 5) of the cone shell designed as flap parts. 2. Drill head according to claim 1, characterized in that a driver nose (7) for taking up torque is arranged on the flap part (4 or 5). 3. Drill head according to claim 1, characterized in that for locking the flap part (4 or 5) in the open and closed position, a spring-loaded bolt (9) is effectively connected to the bearing (10) of the flap part holding the pivot axis (6). 4. Drill head according to one of claims 1 to 3, characterized in that a chisel-like cutting element (8) is arranged on the outside of the flap part <4 or 5). 5. Drill head according to one of claims 1 to 4, characterized in that the drill head with arranged drill head tip (2) can be detachably connected to the hollow drilling auger tube (3).