EP0118487A1

EP0118487A1 - Device for deburring and bevelling drilled bores

Info

Publication number: EP0118487A1
Application number: EP19830902744
Authority: EP
Inventors: Rudolf Blatty
Original assignee: BLATTY AG
Current assignee: BLATTY AG
Priority date: 1982-09-09
Filing date: 1983-09-07
Publication date: 1984-09-19
Also published as: CH656567A5; WO1984000912A1

Abstract

Dispositif pour ébarber est chanfreiner des alésages (intérieur et extérieur), doté d'un boîtier et d'un arbre moteur dépassant de celui-ci, ainsi que d'un bras portant un outil pour ébarber et chanfreiner et d'une courroie dentée pour entraîner l'outil, rendant aisée et possible une modification et une adaptation de la longueur du bras, et donc d'un usage universel. Ce dispositif a pour caractéristique que le bras (27) est maintenu de façon amovible dans le boîtier (3) grâce à des gorges (33) et à des rails (31) et qu'il est sous pression de ressort (29), cette pression de ressort tendant la courroie dentée (21). Un jeu de bras (27) de différentes longueurs avec courroies dentées correspondantes (21) est prévu. On peut aussi changer d'outil (45). Ce dernier est un élément d'un jeu de changement d'outils.Device for deburring and chamfering bores (inside and outside), provided with a housing and a motor shaft projecting therefrom, as well as an arm carrying a tool for deburring and chamfering and a toothed belt for drive the tool, making it easy and possible to modify and adapt the length of the arm, and therefore of universal use. The characteristic of this device is that the arm (27) is detachably held in the housing (3) by means of grooves (33) and rails (31) and that it is under spring pressure (29), this spring pressure tightening the toothed belt (21). A set of arms (27) of different lengths with corresponding toothed belts (21) is provided. You can also change the tool (45). The latter is part of a tool change set.

Description

Device for deburring and countersinking holes

The present invention relates to a device for deburring and countersinking bores, with a housing and a drive element and an arm carrying a deburring and countersinking tool and with a toothed belt for driving the tool.

State of the art

For internal deburring and external deburring of transverse bores in pipes, cylinders, profiles, grooves and the like, in particular for bores that are difficult to access,

10 such devices are known. They have a drive shaft in an elongated housing at one end and the deburring tool at the other end. The two are connected to each other via a chain drive. This construction probably allows

15 change of the Eifcgrater tool, but is otherwise not interchangeable, so that in particular the distance between the drive and the deburring tool cannot be changed, which considerably limits the use of this device in practice, for example by

²⁰ internal deburring of cross holes in pipes is only possible up to this fixed length.

Presentation of the invention

The invention therefore aims at providing a Vor¬ direction which _U ^* possible in a simple manner a change --- nd adjustment of the arm length, and thus dar¬ provides a more suitable for the practical apparatus, since it is more universally usable.

OMPI Such a device is characterized by the content of claim 1. Brief description of the drawings An exemplary embodiment of the subject matter 5 of the invention is subsequently explained with the aid of a drawing. Show it:

1 is a perspective view of the device in the assembled, ready-to-use state,

Fig. 2 shows the device of FIG. 1 in a disassembled state.

^ - ~ Description of the individual figures

The device 1 shown in the figures has a compact housing 3 with a small cover 4, which is connected to the housing 3 by means of screws 5 via screw holes 6 in the housing 3. The 0 cover 4 partially covers a bottom 8 of the housing. This leads to an interior 9. From the base 8, a larger bore 10 extends into the area of the counter wall of the base 8 to the housing 3, a side channel 11 corresponding to 5 opening into the bore 10 from the outside, as is the case with this 2 can be seen. A ball bearing 13 is pressed into the housing wall opposite the bottom 8. A drive shaft 14 with a collar 15 and a toothed belt pinion 16 is provided with a further collar 17 and a shaft end 18 (FIG. 2). This drive shaft 14 is inserted into the bore 10 and the ball bearing 13 and protrudes from the housing 3 in the assembled state, as indicated by dash-dotted lines in FIG. 2. The diameter of the bore corresponds to the outer diameter of the toothed belt pinion 16. Die. The drive shaft 14 is supported at one end in the ball bearing 13 and with the shaft end 18 in one

Ball bearing 20 which is pressed into the cover 4.

A toothed belt 21 is used for driving. A retaining pin 22 is fastened in the housing 3 and protrudes into the side channel 11. On one narrow side of the housing 3, which runs parallel to the bore 10, there is a threaded bore 24 for receiving it of a holding rod 25. A tool support arm 27 with a transversely continuous cutout 28 has a central bore for receiving a tension spring 29, which is designed as a helical spring. Two side screws 30 hold the tension spring 29 in the support arm 27. The thickened end of the support arm 27 is provided with guide rails 31 which fit into guide grooves 33 in the housing 3 and enable the two parts 3 and 27 to be connected to one another by insertion. Belt guide channels 35 and 36 are provided on opposite sides of the support arm 27, at the end of which the support arm 27 is fork-shaped and serves to receive a toothed belt pinion 37. This is rotatable in two ball bearings 38 and 39 in the

_OMPI Side flanks 40 and 41 of the support arm 27 'attached. A grub screw 43 is used to hold a deburring tool 45, which can thus be replaced in a simple manner. The deburring tool 45 is provided with an actual tool head 46, which is followed by a bearing stub 47 with an end 48 which fits into a ball bearing 38. A chamfer 49 in the bearing stub 47 enables the tool 45 to be held in a rotationally fixed and axial manner in the toothed belt pinion 37 and the ball bearings 38 and 39.

This device is installed in such a way that the drive shaft 14 is inserted into the housing 3 through the bore 10. After the drive shaft 14 is mounted in the ball bearing 13 of the housing 3, the toothed belt 21 is pushed laterally over the pinion 16 so that it extends along the side walls of the side channel 11 and protrudes therefrom. Then the cover 4 is placed so that the shaft end 18 is supported in the ball bearing 20. Then the cover is fastened to the housing 3 by means of the screws 5. Then the tool support arm 27, which is available in different lengths, is inserted with its guide rails 31 into the guide grooves 33 of the housing 3 until the tension spring 29 comes to rest on the retaining pin 22. Then the support arm is pressed against the tension spring 29 backwards into the housing 3 and the belt 21 is pushed over the toothed belt pinion 37. The tension spring 29 now tries to push the support arm 27 outwards from the housing 3, which prevents the toothed belt 21, which is tensioned in accordance with the tensioning force of the spring 29.

_ O PI A strap 21 of corresponding length belongs to each support arm.

Each device includes a set of tool support arms 27 of different lengths, which are interchangeably fastened in the housing 3. To replace it, the cover 4 has to be lifted away, the belt 21 has to be replaced by the corresponding belt for the new support arm 27 to be inserted, the cover has to be replaced and the new support arm has to be pushed in as explained. To change the tool in accordance with the bore to be machined, the grub screw 43 is loosened, the deburring tool 45 is pulled out to the side and the other tool is pushed in, so that when the grub screw 43 is tightened, it meets the milling 49 of the bearing stub 47 and the tool firmly connected to the pinion 37.

This device is very compact, extremely simple in construction and easily adaptable to the problems which arise in practice with regard to the diameter of the bores, the location of the bores and the like. The use of a toothed belt with a belt tension determined by a tension spring also represents an overload protection, in that the toothed belt is designed in terms of dimensions and material in such a way that when a predetermined circumferential force on the belt is exceeded, its teeth are elastically deformed, thereby driving the toothed pinion 37 is interrupted with the tool. The critical circumferential force can be changed by the choice of the tension spring 29.

Claims

Claims;

1. Device for deburring and countersinking bores, with a housing and a drive element (14) and an arm (27) carrying a deburring and countersinking tool (45) and with a toothed belt (21) for driving the tool ( 45), characterized in that the arm (27) is held interchangeably in the housing (3) and is under spring pressure (29), with this spring pressure tensioning the toothed belt (21).

2. Device, preferably according to at least one of the claims, characterized in that a set of arms (27) of different lengths with associated toothed belts (21) is provided.

3. Device, preferably according to at least one of the claims, characterized in that the tool (45) is interchangeable and preferably forms a member of a tool change set.

4. The device, preferably according to at least one of the claims, characterized in that the toothed belt is provided as a preferred load protection by a part of the belt, e.g. the teeth are or are deformable in the event of an overload in order to allow the belts to grind in the event of an overload without leaving any permanent disadvantages.

^

5. The device, preferably according to at least one of the claims, characterized in that the arm (27) is held in the housing (3) by means of grooves (33) and rails (31).

^OMPIOMPI