LARSSON, Martin (Rävstigen 18, Öjersjö, S-433 50, SE)
CLAIMS
1. A drilling-machine for making holes in building structures or the like, said drilling machine comprising a frame (2) having a column (3) which is adjustable in different directions in respect to a substantially vertical plane, a drill motor (16) for operating a drill (17), said drill motor being fixed to a gear box (15) having a transmission interacting with a rack (4) provided along said column, and a feed motor (28) for actuating said transmission, characterized in that said feed motor (28) is connectable to said gear box (15) in at least two positions to achieve different gear ratios for the feeding of the drill motor (16) with the drill (17).
2. Drilling-machine according to claim 1, characterized in that said feed motor (28) is connectable to said gear box (15) by means of a coupling (29) which can be provided with a mounting (41), said mounting being arranged to receive and to be detachably fastened at at least one flanged cap (40) on the gear box.
3. Drilling-machine according to claim 2, characterized in that a drive shaft (42) of the coupling (29) is connected to a first or a second shaft (47, 51) journalled in the gear box (15), each shaft providing a predetermined gear ratio through a transmission to the rack (4) on the column (3).
4. Drilling-machine according to claim 2 or 3, characterized in that said mounting (41) and said flanged cap (40) are so formed that said cap is receivable within said mounting in only two different positions.
5. Drilling-machine according to claim 4, characterized in that said positions are situated about 180° from each other.
6. Drilling-machine according any of claims 1 - 5, characterized in that said feed motor (28) is connectable to said gear box (15) on both sides thereof.
7. Drilling-machine according to claim 6, characterized in that one cap (40) is arranged on each side of the gear box (15) and that said first and second shafts (47, 51) protrude into both said caps (40), said caps each being able to be received in different positions in the mounting (41) on said coupling (29). |
A DRILLING MACHINE FOR MAKING HOLES IN
BUILDING STRUCTURES COMRPISING A GEAR BOX
WITH DIFFERENT GEAR RATIOS
Technical field
The present invention is related to a drilling machine according to the pre- characterizing portion of claim 1.
Background of the invention Drilling machines of the kind mentioned above are known. One problem with such machines is the ability to drill at different gear ratios. Another problem is the non ability of such drilling-machines to reach every space of a site where a hole is to be drilled.
Ob j ect of the invention
The object of the invention is to provide a drilling-machine in which the above problems are sets aside.
Summary of the invention The above objects are achieved by means of a drilling-machine having the features according to the characterizing portion of the independent claims.
The sub claims define preferred embodiments of the invention.
A drilling-machine according to the invention has the advantage that the drill equipment can be fed using different gear ratios. This means that a more powerful feed can be used for unusually tough drilling conditions while
using the same small feed engine adapted for the the the more normal quicker feed.
Another advantage is that the coupling with the feed motor can be shifted to the other side of the gear box, whereby the drilling-machine can be moved further into a corner or the like to drill a hole in the pavement or the like.
Brief description of the drawings
The invention will be described in closer detail in the following by way of a preferred embodiment thereof with reference to the annexed drawings. Fig. 1 is a perspective side view of a drilling-machine according to the invention.
Fig. 2 is a perspective front view of the drilling-machine according to the invention, where parts are removed for clarity.
Fig. 3 is a partial rear view of the drilling-machine according to the invention, where parts are removed for clarity.
Fig. 4 is a partial side view of the drilling-machine according to the invention, where parts are removed for clarity
Fig. 5 is a exploded perspective view of a feed motor, a coupling device and a gear box with a tubular case. Fig. 6 is an enlarged perspective view of a coupling device provided between said feed motor and said gear box of said drilling-machine.
Fig. 7 is a partial front view of said drilling-machine, where parts are removed for clarity.
Fig. 8 is a view similar to fig. 4, where further parts are removed for clarity, and illustrating the transmission of said drilling-machine.
Description of preferred embodiments
In the description and drawings, similar items are denoted with the same reference numeral.
In Figs. 1 - 8 a preferred embodiment of a drilling-machine 1 for making holes in building structures or the like is shown. As can be seen in figs. 1 and 2, the drilling machine 1 comprises a frame 2 which has a column 3 with a toothed rack 4 along the front side thereof. At the top of the column 3 a T- formed holder 5 is fastened by means of a bolt 5a. At each rear end of the T- formed holder 5 sleeves 6 and 7 are provided, which can be clamped to be fixed on each one of two rods 8 and 9, respectively, of the frame 2 by means of a turnable handle 10. At the bottom the column is turnably mounted so that the column can be set in different angles relative the ground by actuating the handle 10. The frame 2 is equipped with two wheels 11 for transportation purposes, and has at the bottom thereof a base structure 12 with bolts 13, which are used to fix the frame to the ground.
A tubular case 14 is mounted around the column 3 and a gear box 15 is attached thereto, preferably the gear box 15 is being screwed on the case 14. The gear box 15 has a transmission which engages the rack 4 for movement up and down along the column. The gear box 15 will be explained more in detail below with reference to figs. 7 and 8.
A drill motor 16 is fastened to the gear box 15, and a drill 17 is held by a rotatable chuck at the lower end of the drill motor. The case 14 is round in section and has sealings 18 an 19 abutting the inner side of the ends of the case 14. The sealings have each a hole in the centre thereof corresponding to the sectional configuration of the column3 with rack 4. The sealings 18 and
19 are fixed by means of wrenches 20. At the level of the sealings 18 and 19 the case is provided with slits 21 and 22, respectively, which each extends from the end edge and stops at a predetermined distance at a further slits 23 and 24, respectively, which both extends in the circumferential direction of the case 14 on both sides of the slits 21 and 22 and stops at a predetermined distance so that the length of the further slits 23 and 24 each is about less then the circumference of the case 14. Thereby, two opposite flexible protrusions 25 are performed at each edge of the case 14 and are provided with flanges 26 for bolt and nut connections 27. When the bolt and nut connections 27 are tightened the case 14 is clamped around the column 3 so that the transmission in the gear box 15 is engaged to the rack 4 on the column 3. However, the bolt and nut connections 27 are so tightened that the drill motor 16 can be fed up and down along the column 3.
The transmission in the gear box 15 is actuated by a reversible feed motor 28 which is connected with a coupling 29 which in turn is connectable with the gear box 15 at both sides thereof. The coupling 29 has a handle 30, by means of which the operator can engage and disengage the coupling 29 together with the feed motor 28 to change the gear ratio or to move the coupling 29 and the feed motor 28 to the most convenient side of the gear box 15.
A cable 31 is connected to a power source, not shown, to supply the feed motor 28 with power. The reference number 32 denotes a cable, which from the feed motor 28 via a contact 33 and another cable 34 connected to the drill motor 5 supplies the drill motor with power. At 35 a flexible water supply tube 35a is connected to the feed motor 28. At 36 a flexible water supply tube 36a is connected to the feed motor 28 at, which tube transports water to the drill 17.
Reference number 37 denotes a controller box for controlling the operation of the drilling-machine 1 is connected to the feed motor 28 at 37a by means of a cable 37b. Primarily, the switches and knobs of the controller box 37 are used to control the feeding of the drill motor 16 upwards or downwards along the column 3, to electrically control the speed of the drill 17, to control the supply of water to the drill 17 and to switch on or off the drilling- machine 1.
As can be seen in fig 5 a cap 38 is fastened by means of bolts 39 on each side of the gear box 15. The cap 38 has a circumferentially extending flange 40 with grooves 40a at its upper and lover edge. At one side of the coupling 4 a mounting 41 is provided which is intended to receive the cap 38 to establish an engagement between coupling 4 and the transmission in the gear box 15. The mounting 41 is provided with a rotatable drive in the form of a square section shaft 42 (see fig. 6) which is driven by the feed motor 3 through the coupling 4. By means of the handle 30, the operator can mount the mounting 41 on the cap in two positions by rotating the mounting about 180°. The mounting is fixed to the cap 38 by means f a bolt an nut connection 41a, whereby the bolt is tightened and received in one of the grooves 40a of the cap. The operator is also able to move the whole feed motor 28 with the coupling 29 to the other side of the gear box 15 where a similar cap 40 is mounted (deleted from the drawings for clarity reasons). The end of the shaft will accordingly be able to engage either an upper nut 43 or a lower nut 44. On the other side of the gear box similar upper and lower nuts 45 and 46, respectively, are provided. The lower nuts 44 and 46 are fixed at the ends of a lower transmission shaft 47 which is journalled in the gear box 15 and upon which a pinion 48 is non rotatably mounted and engaged with the rack
4 on the column 3. A further gear wheel 49 is non rotatably mounted on the lower shaft 47 which is engaged with yet another gear wheel 50 non rotatably mounted on an upper transmission shaft 51 which is journalled in the gear box and carries at its ends the upper nuts 43 and 45. The dimensions of the gear wheels 48, 49 and 50 are chosen to achieve optimal predetermined gear ratio by rotating either the lower or the upper transmission shafts 47 and 51, respectively. The rotation of the lower transmission shaft 47 which rotates the pinion 48 generates a gear ratio which is less than by rotating the upper transmission shaft 51. The difference in gear ratio can be chosen so that when actuating the upper transmission shaft 51 it renders a higher gear ratio, which can be used when the force is to be increased, e.g., at more solid material to be penetrated or if more solid material occurs during the drilling operation. The upper transmission shaft 51 provides a gear ratio which can be more than twice the gear ratio of the lower transmission shaft 47. As mentioned above, the difference in gear ratio between the transmission shafts 47 and 51 depends on the dimension of the gear wheels 48, 49 and 50. The operator can at any time control the speed which can be altered electronically by means of the knobs of the controller box 37.
A stop ring 52 (only shown in fig.l) is mounted on the column 3 and can be fixed at different positions if the hole to be drilled shall not exceed a predetermined drill depth. On the other hand, the drill-machine can be programmed to stop automatically either when the drill 17 has penetrated a material or when the drill has not moved downwards for a certain period of time, e.g., 2 - 3 seconds.
It should be noted that the drilling-machine according to the invention is not limited to the above described embodiment, but could be modified within the scope of the appended claims.
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