WO2010059084A1

WO2010059084A1 - A drill stand for a concrete drilling device with a level indicator

Info

Publication number: WO2010059084A1
Application number: PCT/SE2008/051326
Authority: WO
Inventors: Martin Larsson
Original assignee: Husqvarna Ab
Priority date: 2008-11-18
Filing date: 2008-11-18
Publication date: 2010-05-27

Abstract

A drill stand (3) for a concrete drilling apparatus having a concrete drill (1) and a drilling device (2) for rotating the concrete drill (1), said drill stand (3) including a support device (4) having a base (4') adapted to be anchored to a floor, a wall, or fitted to a structure that in turn is anchored in a suitable manner, said drill stand (3) further including a drill column (5) having a vertical normal position, a shaft member (6) by which one end of the drill column (5) is pivotally attached to the support device (4), means for adjusting an inclination of the pivotal drill column (5) in relation to the normal position, said drilling device (2) being mounted on the drill column (5) and movable there along toward and away from the pivotally attached end of the drill column (5), and means including a graduated arc (11) and a cooperating mark (12) movable relative each other along the graduated arc (11) for indicating an inclination of the drill column (5) in relation to its vertical normal position. To provide a drill stand with a drill inclination gauge(10) that is easy to read and can be used also on sloping surfaces without needing correction, the drill stand is provided with a level indicator (101), and a rotary member (103), on/in which the level indicator (101) is mounted, said rotary member (103) being mounted on/in said drilling device (2), and one of said mark (12) and cooperating graduated arc (11) being provided on said rotary member (103) and the other one being provided on said drilling device (2).

Description

A drill stand for a concrete drilling device with a level indicator

DESCRIPTION

TECHNICAL FIELD

The present invention relates to a drill stand for a concrete drilling device having a concrete drill and a drilling device for rotating the concrete drill, said drill stand including a support device having a base adapted to be anchored to a floor, a wall, or fitted to a structure that in turn is anchored in a suitable manner, said drill stand further including a drill column having a vertical normal position, a shaft member by which one end of the drill column is pivotally attached to the support device, means for adjusting an inclination of the pivotal drill column in relation to the normal position, said drilling device being mounted on the drill column and movable there along toward and away from the pivotally attached end of the drill column, and means including a graduated arc and a cooperating mark movable relative each other along the graduated arc for indicating an inclination of the drill column in relation to its vertical normal position.

The invention also relates to a method of setting/measuring a desired drilling direction or measuring the drilling direction in a drill stand for a concrete drilling device having a concrete drill and a drilling device for rotating the concrete drill, said drill stand including a support device having a base adapted to be anchored to a floor, a wall, or fitted to a structure that in turn is anchored in a suitable manner, said drill stand further including a drill column having a vertical normal position, a shaft member by which one end of the drill column is pivotally attached to the support device, means for adjusting an inclination of the pivotal drill column in relation to the normal position, said drilling device being mounted on the drill column and movable there along toward and away from the pivotally attached end of the drill column, and means including a graduated arc and a cooperating mark movable relative each other along the graduated arc for indicating an inclination of the drill column in relation to its vertical normal position.

BACKGROUND ART

Such a drill stand and such a method are disclosed in WO 2008/026975 Al [Husqvarna]. There, one end of the drill column is pivotally attached to the base by a center portion of a pivot shaft member. The base has a bearing bracket at each end of the pivot shaft member, and each bearing bracket has a cap portion that can be tightened to lock the pivot shaft member against rotation. One of the pivot shaft member and the bearing bracket has a first mark indicating the normal position of the drill column and the other has a graduated arc indicating the actual inclination of the drill column. Together the first mark and the graduated arc form a drill inclination gauge.

In operation, the drilling device usually has the base is anchored to the floor. As a consequence, the drill inclination gauge will be located at a short distance above the floor, and due to the distance between a standing operator's eye and the drill inclination gauge, the inclination angle will not always be easy to read. Further, if the floor is sloping, like in a multistory garage drive, for example, the slope of the floor has to be taken into account, if the bore to be drilled has to have a specified inclination in relation to vertical or horizontal plane.

DISCLOSURE OF THE INVENTION

In a first aspect of the present invention, an object of the invention of is to provide a drill stand with a drill inclination gauge that is easy to read and can be used also on sloping surfaces without needing correction.

In accordance with the present invention, this object is achieved in that the drill stand specified in the first paragraph above comprises a level indicator, a rotary member, on/in which the level indicator is mounted, said rotary member being mounted on/in said drilling device, and one of said mark and cooperating graduated arc being provided on said rotary member and the other one being provided on said drilling device.

In a second aspect of the present invention, an object of the invention of is to provide a method of setting a desired drilling direction in a drill stand for a concrete drilling device.

In accordance with the present invention, this object is achieved in the drill stand specified in the second paragraph above by carrying out the steps of providing a level indicator, providing a rotary member, on/in which the level indicator is mounted, said rotary member being mounted on/in said drilling device, and one of said mark and cooperating graduated arc being provided on said rotary member and the other one being provided on said drilling device, rotating the rotary member, so as to make the mark point at a predetermined position along the graduated arc corresponding to the desired drilling direction, and pivoting the drill column until the level indicator indicates that it is leveled.

In a third aspect of the present invention, an object of the invention of is to provide a method of measuring a drilling direction in a drill stand for a concrete drilling device.

In accordance with the present invention, this object is achieved in the drill stand specified in the second paragraph above by carrying out the steps of providing a level indicator, providing a rotary member, on/in which the level indicator is mounted, said rotary member being mounted on/in said drilling device, and one of said mark and cooperating graduated arc being provided on said rotary member and the other one being provided on said drilling device, rotating the rotary member, so as to make the level indicator leveled, and reading a graduated arc value pointed at by the mark.

By mounting the drill inclination gauge on the proper drilling device, that is movable along the drill column, it will be easier to read than if it were placed slightly above the floor, and by using a level indicator, the drill inclination gauge can be used also on sloping surfaces without needing correction.

Preferably the level indicator is a bubble level. This provides a cost effective and reliable level indicator. Alternatively the level indicator is an electronic level indicator that provides a light signal and/or a sound signal when the level indicator is leveled. Alternatively the level indicator is a mechanical level indicator, e.g. a heavy ball rolling back and forth in a semicircle cavity.

Preferably, the drilling device has a horizontally extending cylindrical bore and the rotary member has a cylindrical shank fitting rotary in the bore.

Preferably, the rotary member further has a head including a radially outward extending flange. Preferably, the head includes an axially projecting central portion offering finger grip, and the level indicator is housed in the projecting portion. Thereby, the setting of a desired inclination of the drill column or the measurement of the actual inclination of the drill column is facilitated.

Suitably, one of said mark and cooperating graduated arc is provided on the flange and the other one is provided on said drilling device. This further facilitates the setting of a desired inclination of the drill column or the measurement of the actual inclination of the drill column.

Preferably flange of the head is made of transparent material, and the flange covers the graduated arc. Thereby the flange protects the graduated arc against wear or other damage, while still the graduated arc being visible.

Preferably the finger grip portion of the head housing the level indicator is made of transparent material. Thereby the level indicator is visible while being protected against wear or other damage. This is particular useful is the level indicator provides its level indication by visual means, e.g. the bubble level. Then, to facilitate reading, the transparent flange is of a thickness that varies in a manner such that a magnifying glass effect is produced.

The cylindrical shank has a fixed end, which suitably has a radially extending disc having a side facing and cooperating with the flange of the head, and the graduated arc is a protractor attached to the shank flange side that faces the flange of the head. Thereby, a still better protection of the protractor against wear or other damage is achieved.

Preferably, the drilling device includes a drilling machine and a feed housing, on which the drilling machine is mounted for movement along the drill column, the rotary member being mounted on/in said feed housing. Thereby, the drill inclination gauge will be better protected against damage than if it were mounted on/in the drilling machine.

Then it is suitable that the cylindrical shank has a circumferential annular groove, and a stop member is mounted in said feed housing to extend into the groove, so as to prevent the shank from leaving the bore while still permitting rotation of the rotatable member.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, the invention will be described in more detail with reference to preferred embodiments and the appended drawings.

Fig. 1 is a perspective view of a concrete drilling apparatus having a drill stand in accordance with a preferred embodiment of the present invention, with an inclined pivotal drill column along which a drilling machine mounted on a feed housing is movable.

Fig. 2 is an exploded perspective view of the feed housing and a drill inclination gauge having a rotary member with a head and a cylindrical shank.

Fig. 3 is a side view of the rotary member of Fig. 2 and shows a circumferential annular groove provided on the cylindrical shank for cooperation with a stop member.

Fig. 4 is a perspective view of a preferred embodiment of the rotary member of Figs. 2 and 3.

Fig. 5 is a side view of the head of the rotary member of Figs. 2-4 as viewed from the left hand side of Fig. 3. Fig. 6 is a simplified side view of the drill stand of Fig. 1 with the drilling machine and some support structure removed for greater clarity.

Fig. 6a is a view on a larger scale of an area marked A in Fig. 6 and shows a drill inclination gauge mounted in a feed housing of the drill stand.

Fig. 7 is a simplified side view of the drill stand of Fig. 1 similar to Fig. 6 but having the drill column turned to a vertical position.

Fig. 7a is a view on a larger scale of an area marked B in Fig. 7 and shows the drill inclination gauge.

Fig. 8 is a simplified side view of an alternative embodiment of the drill stand of Fig. 6 with drill column in an inclined position.

Fig. 8a is a view on a larger scale of an area marked C in Fig. 8 and shows the drill inclination gauge.

Fig. 9 is a side view of the drill stand of Fig. 8 but having the drill column turned to a vertical position.

Fig. 9a is a view on a larger scale of an area marked D in Fig. 9 and shows the drill inclination gauge.

MODE(S) FOR CARRYING OUT THE INVENTION

The concrete drilling apparatus shown in Fig. 1 has a drill 1 and a drilling device 2 for rotating the drill. The shown drill 1 is a core drill, but it might as well be an ordinary drill. The drilling device 2 is carried by a drill stand 3, which has a support device 4 and a drill column 5. The support device 4 includes a base 4' adapted to be anchored to a floor, a wall, or fitted to a structure that in turn is anchored in a suitable manner, and the drill column 5 has a normal position at right angles to the base 4' . The drilling device 2 is movable along the drill column 5. In the embodiment shown in Fig. 1, the lower end of the drill column 5 is pivotally attached to the base 4' by a shaft member 6, and means are provided for adjusting the inclination of the pivotal drill column 5 in relation to its normal position. The drill column 5 is fixed to the shaft member 6, and means are provided for locking the shaft member against rotation, so as to maintain any set, desired inclination of the drill column 5. The drill column has a gear rack 7 along which the drilling device 2 is movable toward and away from the base 4', either manually or by means of an automatic feeding device. The shown stand 3 has a wheel assembly 8 mounted to a rear end of the base 4' to facilitate a translocation of the concrete drilling apparatus. When the concrete drilling apparatus is standing on a floor, the base 4 engages the floor, and the wheels of the assembly 8 carry no weight at all or no appreciable part of the weight of the concrete drilling apparatus. Further, in the embodiment shown in Fig. 1, a pair of longitudinal supports 9 extends from positions close to the wheels and substantially parallel to the drill column 5, and the top of the drill column 5 has a support member that is glidingly connected to the supports 9 to assist in maintaining the drill column in a desired position. A drill inclination gauge 10 is provided for indicating an inclination of the drill column 5 in relation to its vertical normal position and include a graduated arc 11 and a cooperating mark 12 movable relative each other along the graduated arc. If desired, it is, of course, possible to use two such marks 12 that preferably are located diametrically opposite each other.

In accordance with the present invention, the drill inclination gauge 10 includes a level indicator 101 here shown in the form of a bubble level 101 and a rotary member 103 on/in which the bubble level 101 is mounted. The rotary member 103 is mounted on/in the drilling device 2, and one of said mark 12 and cooperating graduated arc 11 is provided on the rotary member 103 and the other one is provided on the drilling device 2. The graduated arc preferably is a full circle protractor 11 marked in degrees. By mounting the drill inclination gauge 10 on the proper drilling device 2, which is movable along the drill column 5, the gauge 10 will be easier to read than if it were placed slightly above the floor, and by utilizing a bubble level 101, the drill inclination gauge 10 can be used also on sloping surfaces, such as multistory garage drives, without needing correction.

In the preferred embodiment shown in Fig. 1, the drilling device 2 includes a drilling machine 21 and a feed housing 22, on which the drilling machine 21 is mounted for movement along the drill column 5, either manually or by means of an automatic feeding device, and the rotary member 103 is mounted on/in said feed housing 22. Thereby, the drill inclination gauge 10 will be better protected against damage than if it were mounted on/in the drilling machine 21.

As shown in the exploded perspective view of Fig. 2, the feed housing 22 has a horizontally extending cylindrical bore 102 and the rotary member 103 has a cylindrical shank 104 fitting rotary in the bore 102. The rotary member 103 further has a head 105 including a radially outward extending flange 106 and an axially projecting central portion 107 offering finger grip. Around the bore 102, the feed housing 22 has a shallow circular recess 114 for partly receiving the flange 106 therein. The bubble level 101 is housed in the projecting finger grip portion 107, which as shown preferably has the shape of a wing, in which the bubble level 101 is at least partially embedded. Thereby, the setting of a desired inclination of the drill column or the measurement of the actual inclination of the drill column is facilitated.

The cylindrical shank 104 has a circumferential annular groove 108 shown in Fig. 3, and a stop member 109 is mounted in the feed housing 22 to extend into the groove 108, so as to prevent the shank 104 from leaving the bore 102, while still permitting rotation of the rotary member 103. The stop member 109 suitably is a screw, which by tightening or loosening determines the force necessary for rotating the rotary member 103.

One of the mark 12 and the cooperating graduated arc 11 is provided on the flange 106 and the other one is provided on the feed housing 22. In the embodiments shown in the drawings, the mark 12 is located on the feed housing 22 and the graduated arc 11 is located on the flange 106, but if desired, they could change places. This further facilitates the setting of a desired inclination of the drill column 5 or the measurement of the actual inclination of the drill column 5.

A preferred embodiment of the rotary member 103 is shown in Fig. 4. As illustrated, the head 105, i.e. the flange 106 and the finger grip portion 107, is made of a transparent material such as poly (methyl methacrylate), and the flange 106 covers the graduated arc 11. A complete embedding of the bubble level 101 in the transparent material combines good protection of the bubble level 101 with good visibility, and the flange 106 protects the graduated arc 11 against wear or other damage. However, if desired, it would also be possible to make the head 105 of non-transparent material, provided that the bubble level 101 was not completely embedded therein. Then, the graduated arc 11 would have to be attached to the outward facing annular surface of the flange 106, or to the feed housing 22 if the mark 12 cooperating with the graduated arc 11 was located on the flange 106. The utilization of a transparent material in the flange 106 makes it possible to vary the thickness of the flange in order to produce a magnifying glass effect, and such a variation in thickness is best shown in Fig. 3, where the thickness is gradually reduced along a curved line from one value at a central area of the flange 106 to another at the periphery of the flange. The magnification obtained facilitates a correct reading of the graduated arc 11.

However, in the preferred embodiment shown in Fig. 4, the rotary member 103 consists of two separate parts made of different materials, viz. the head 105 made of a transparent material and the shank 104 made of a non-transparent material. The fixed end of the shank 104, i.e. the end closest to the head 105, has a radially extending disc 110, on which the graduated arc 11 is attached, and in the center of the disc 110, there is a male coupling member 111 for connecting the shank 104 to the head 105, which in the center of the flange 106 has a corresponding female coupling member 112. In the shown embodiment, the two coupling members have a square cross-section. If desired, it is, of course, possible to let the male and female coupling member change places. As is best shown in Fig. 5, in addition to the female coupling member 112, the flange 106 has a recess 113 for receiving the disc 110. Thus, the graduated arc or protractor 11 on the disc 110 is well protected against wear or other damage.

Further, in the preferred embodiment shown in Fig. 4, the bubble level 101 has such an orientation in relation the graduated arc or protractor 11 that when the bubble level 101 indicates a horizontal position, i.e. a vertical position of the drill 1 and the drill column 5, 45° is at the twelve o'clock position and the mark 10 points at 0° (or 90° if, as shown, the protractor 11 has four fields of 0°-90° each). When the drill 1 and the drill column 5 are pivoted to the position shown in Fig. 1 and the rotary member 103 is rotated to bring the bubble level 101 into horizontal position, the mark 10 will point at 45°.

Fig. 6 is a simplified side view of the drill stand of Fig. 1 with the drilling machine and some support structure removed for greater clarity. The feed housing 22 comprises a tubular member 221 and a saddle member 222 mounted on the tubular member. The drill column 5 extends through the tubular member 221, which is reciprocable thereon, either manually or by means of an automatic feeding device, and the drilling machine 21 is intended to be mounted on the saddle member 222. The drill inclination gauge 10 of Fig. 4 is mounted on/in the saddle member 222 and is shown on a larger scale in Fig. 6a. The bubble level 101 is horizontal and the drop- shaped mark 12 is placed on the saddle member 222 and points at 45° on the protractor 11, thereby telling that the drill column 5 is inclined 45°.

In Fig. 7, the drill column 5 is raised to vertical position. After rotating the rotary member 103 of the drill inclination gauge 10 so that the bubble level 101 becomes horizontal, the drop-shaped mark 12 points at 0° on the protractor 11 as shown in Fig. 7a.

Figs. 8, 8a, 9, and 9a show an alternative embodiment of the drill stand in the concrete drilling apparatus of the present invention. In view of the great similarities between this embodiment and the one described in connection with Figs. l-7a, corresponding reference numbers will be used but here selected from the 1000-series, but in principle, most of the identical features will not be described.

Like above, the drill stand 1003 includes a support device 1004, a drill column 1005 having a vertical normal position, a shaft member 1006 by which one end of the drill column 1005 is pivotally attached to the support device 1004, and means for adjusting an inclination of the pivotal drill column 1005 in relation to the normal position. However, here the support device 1004 includes a vertical telescopic support column 1041 standing on the base 1004' and a housing 1042 that is movable along the support column 1041. The vertical telescopic support column 1041 has a gear rack 1007, along which the housing 1042 is movable toward and away from the base 1004, either manually or by means of an automatic feeding device. The housing 1042 carries the shaft member 1006, to which one end of the drill column 1005 is anchored, and which can be locked against rotation to maintain any set desired inclination of the drill column 1005.

In Fig. 8, like in Fig. 6 the drilling machine is removed for greater clarity. The feed housing 1022 comprises a tubular member 1221 and a saddle member 1222 mounted on the tubular member. The drill column 1005 extends through the tubular member 1221, which is reciprocally movable thereon, and the drilling machine is intended to be mounted on the saddle member 1222 and to be moved along the drill column 1005 either manually or by means of an automatic feeding device. The drill inclination gauge 1010 of Fig. 4 is mounted on/in the saddle member 1222 and is shown on a larger scale in Fig. 8a. After any required rotation of the rotary member 1103, the bubble level 1101 is horizontal and the drop-shaped mark 1012 is placed on the saddle member 1222 and points at 45° on the protractor 1011, thereby telling that the drill column 1005 is inclined 45°.

In Fig. 9, the drill column 1005 is raised to vertical position. After rotating the rotary member 1103 of the drill inclination gauge 1010 so that the bubble level 1101 becomes horizontal, the drop-shaped mark 1012 points at 0° on the protractor 1011 as shown in Fig. 9a.

Whereas the invention has been shown and described in connection with the preferred embodiments thereof it will be understood that many modifications, substitutions, and additions may be made which are within the intended broad scope of the following claims. From the foregoing, it can be seen that the present invention accomplishes at least one of the stated objectives.

For instance, the level indicator 101 has been shown as a bubble level. However, alternatively other level indicators having visual signal means and/or sound signal means can be utilised, e.g. an electronic level indicator turning off or turning on a light when levelled and or providing a sound signal when leveled.

Claims

CLAIMS:

1. A drill stand (3) for a concrete drilling apparatus having a concrete drill (1) and a drilling device (2) for rotating the concrete drill (1), said drill stand (3) including a support device (4) having a base (4') adapted to be anchored to a floor, a wall, or fitted to a structure that in turn is anchored in a suitable manner, said drill stand (3) further including a drill column (5) having a vertical normal position, a shaft member (6) by which one end of the drill column (5) is pivotally attached to the support device (4), means for adjusting an inclination of the pivotal drill column (5) in relation to the normal position, said drilling device (2) being mounted on the drill column (5) and movable there along toward and away from the pivotally attached end of the drill column (5), and means including a graduated arc (11) and a cooperating mark (12) movable relative each other along the graduated arc (11) for indicating an inclination of the drill column (5) in relation to its vertical normal position, c h a r a c t e r i z e d b y

- a level indicator (101),

- a rotary member (103), on/in which the level indicator (101) is mounted, said rotary member (103) being mounted on/in said drilling device (2), and one of said mark (12) and cooperating graduated arc (11) being provided on said rotary member (103) and the other one being provided on said drilling device (2).

2. A drill stand as claimed in claim 1, wherein said drilling device (2) has a horizontally extending cylindrical bore (102) and the rotary member (103) has a cylindrical shank (104) fitting rotary in the bore (102).

3. A drill stand as claimed in claim 1 or 2, wherein the rotary member (103) further having a head (105) including a radially outward extending flange (106).

4. A drill stand as claimed in claim 3, wherein the head (105) further including an axially projecting central portion (107) offering finger grip, said level indicator (101) being housed in said projecting portion (107).

5. A drill stand as claimed in claim 3 or 4, wherein one of said mark (12) and cooperating graduated arc (11) is provided on the flange (106) and the other one is provided on said drilling device (2).

6. A drill stand as claimed in claim 3 or 4, wherein the head (105) is made of transparent material, and the flange (106) covers the graduated arc (11).

7. A drill stand as claimed in claim 6, wherein the transparent flange (106) is of a thickness that varies in a manner such that a magnifying glass effect is produced.

8. A drill stand as claimed in claim 6 or 7, wherein the cylindrical shank (104) has a fixed end, which has a radially extending disc (110) having a side facing and cooperating with the flange (106) of the head (105), and the graduated arc is a protractor (11) attached to the disc (110) side that faces the flange (106) of the head (105).

9. A drill stand as claimed in any one of claims 2-8, wherein the drilling device (2) includes a drilling machine (21) and a feed housing (22), on which the drilling machine

(21) is mounted for movement along the drill column (5), the rotary member (103) being mounted on/in said feed housing (22).

10. A drill stand as claimed in claim 9, wherein the cylindrical shank (104) has a circumferential annular groove (108), and a stop member (109) is mounted in said feed housing (22) to extend into the groove (108), so as to prevent the shank (104) from leaving the bore (102) while still permitting rotation of the rotatable member (103).

11. A drill stand as claimed in any one of claims 1-10, wherein the level indicator is a bubble level.

12. A rotary member according to any one of claims 1-11 to be used in a drill stand accordin ¹gO to claim 1.

13. A rotary member according to any one of claims 1-11 to be used in a drill stand according to any one of claims 2, 5, 9 or 10.

14. A method for setting a desired drilling direction in a drill stand (3) for a concrete drilling apparatus having a concrete drill (1) and a drilling device (2) for rotating the concrete drill (1), said drill stand (3) including a support device (4) having a base (4') adapted to be anchored to a floor, a wall, or fitted to a structure that in turn is anchored in a suitable manner, said drill stand (3) further including a drill column (5) having a vertical normal position, a shaft member (6) by which one end of the drill column (5) is pivotally attached to the support device (4), means for adjusting an inclination of the pivotal drill column (5) in relation to the normal position, said drilling device (2) being mounted on the drill column (5) and movable there along toward and away from the pivotally attached end of the drill column (5), and means including a graduated arc (11) and a cooperating mark (12) movable relative each other along the graduated arc for indicating an inclination of the drill column (5) in relation to its vertical normal position, c h a r a c t e r i z e d b y

- providing a level indicator (101), - providing a rotary member (103), on/in which the level indicator (101) is mounted, said rotary member (103) being mounted on/in said drilling device (2), and one of said mark (12) and cooperating graduated arc (11) being provided on said rotary member (103) and the other one being provided on said drilling device (2),

- rotating the rotary member (103), so as to make the mark (12) point at a predetermined position along the graduated arc (11) corresponding to the desired drilling direction, and

- pivoting the drill column (5) until the level indicator (101) indicates that it is leveled.

15. A method for measuring the drilling direction in a drill stand (3) for a concrete drilling apparatus having a concrete drill (1) and a drilling device (2) for rotating the concrete drill (1), said drill stand (3) including a support device (4) having a base (4') adapted to be anchored to a floor, a wall, or fitted to a structure that in turn is anchored in a suitable manner, said drill stand (3) further including a drill column (5) having a vertical normal position, a shaft member (6) by which one end of the drill column (5) is pivotally attached to the support device (3), means for adjusting an inclination of the pivotal drill column (5) in relation to the normal position, said drilling device (2) being mounted on the drill column (5) and movable there along toward and away from the pivotally attached end of the drill column (5), and means including a graduated arc (11) and a cooperating mark (12) movable relative each other along the graduated arc (11) for indicating an inclination of the drill column (5) in relation to its vertical normal position, c h a r a c t e r i z e d b y

- providing a level indicator (101), - providing a rotary member (103), on/in which the level indicator (101) is mounted, said rotary member (103) being mounted on/in said drilling device (2), and one of said mark (12) and cooperating graduated arc (11) being provided on said rotary member (103) and the other one being provided on said drilling device (2)

- rotating the rotary member (103), so as to make the level indicator (101) indicate that it is leveled, and

- reading a graduated arc value pointed at by the mark (12).