GB2485056A

GB2485056A - Upright processing machine with adjustable stop and brake

Info

Publication number: GB2485056A
Application number: GB1118459.5A
Authority: GB
Inventors: Heiner Lukas; Albert Ruess; Juergen Stoeger
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2010-10-26
Filing date: 2011-10-25
Publication date: 2012-05-02
Also published as: GB201118459D0; CN102528113A; DE102010042951A1

Abstract

The processing machine 10, such as an upright drilling machine, includes a column 11 on which a bearing bracket 14 for a working machine 16 is held so as to be longitudinally displaceable 15. The bearing bracket is acted on by a return spring 27 which is supported, on the one hand, on the bearing bracket and, on the other hand, on an adjustable stop member 30 which is held on the column so as to be adjustable in the longitudinal direction. A complete machine head 17 is fixedly attached to the bearing bracket 14 as the working machine. The machine head contains in a housing 18 a drive motor with gearing and has a tool holding fixture 19. The stop member 30 has a slotted clamp 31 which can be radially tightened by means of a pivotable clamping lever 32. The stop member also has a braking device 50 cooperating with the column 11 to brake the bearing bracket and engaging on the column.

Description

Processing machine of the upright t_ye, in particular upright drilling machine

Prior art

The invention proceeds from a processing machine of the upright type, in particular upright drilling machine, according to the preamble of Claim 1.

Electric tools of the upright type for the do-it-yourself sector are known, in which, as with industrial upright drilling machines, during the drilling and the raising in the opposite direction only the drilling spindle is moved, while the remaining part of the working machine remains rigid and stationary. This leads to a complex constructional design.

Disclosure of the invention

The processing machine of the upright type, in particular upright drilling machine, according to the invention, having the features of Claim 1 has the advantage that a complete machine head is fixedly attached to the bearing bracket as the working machine and, during the drilling and raising in the opposite direction, is moved downwards and upwards respectively. This leads to a simple constructional design with little outlay. The stop member can have a slotted clamp which can be radially tightened by means of a pivotable clamping lever. This enables simple positioning of the bearing bracket with the complete machine head into the desired working position and fixing thereof by simple clamping. It is particularly advantageous when the stop member has a braking device cooperating with the column to brake the bearing bracket and engaging on the column. This braking device guarantees that, on the positioning of the bearing bracket with machine head, on release of the clamping no sudden and rapid downward movement of the bearing bracket with machine head occurs. The braking device ensures that the bearing bracket with machine head, on release of the clamping, does not fall abruptly on the column, but is braked by means of the braking device. It may be advantageous here when the braking device has at least one braking element which is pressed transversely, in particular approximately radially, against the column by means of spring force. Such a processing machine according to the invention is particularly suitable for the do-it-yourself sector.

Advantageous developments and improvements of the processing machine of the upright type specified in Claim 1 are possible by the measures set out in the remaining claims.

It may be advantageous when the stop member has in addition to the clamp a closed ring part, through which the column passes and which is guided on the latter. This ring part can be arranged at an axial distance from the clamp, for example below the latter. Although the braking device of the stop member can be provided on the clamp of the latter, it is particularly advantageous when the braking is provided on the ring part instead.

It may furthermore be advantageous when the at least one braking element is composed of a plastic part, for example of the material POM. Owing to the spring loading, the plastic part forms a thrust piece. It may be advantageous when the braking element is held inside a receptacle, open towards the column, of the stop member, in particular of the closed ring part, and is pressed against the column by means of a compression spring received in the receptacle.

The receptacle may be formed as a threaded bore containing a screw acting on the compression spring.

A further advantageous embodiment provides that for the guidance of the compression spring the plastic part has a guide projection which engages in one end of the compression spring. The screw may have a conical end which engages in the other end of the compression spring.

It may furthermore be advantageous when a guide rod, which runs approximately parallel to the column and is guided in a through-passing guide opening in the stop member, is fastened to the bearing bracket. During the drilling and raising of the bearing bracket with machine head in the opposite direction, the guide rod moves through the guide opening, so that additional guidance of the bearing bracket with machine head relative to the column thereby takes place.

The invention is explained in more detail in the following

description with the aid of exemplary embodiments

illustrated in the drawings, in which: Fig. 1 shows a schematic perspective view of a processing machine of the upright type in the form of an upright drilling machine, Fig. 2 shows a view of the rear side of the processing machine in Fig. 1, Fig. 3 shows a schematic side view of a detail of the processing machine on a larger scale, Fig. 4 shows a schematic side view with partial section of the detail of the processing machine according to Fig. 3 on an enlarged scale, Fig. 5 shows a perspective view of a stop member of the processing machine, Fig. 6 shows an exploded view cf three components of a braking device of the processing machine.

Figs. 1 and 2 show, by way of example, a processing machine of the upright type, which is formed in particular as an upright drilling machine, although a milling machine or a combination machine enabling drilling and milling is also possible instead. The processing machine 10 can be used in particular in the do-it-yourself sector. It has a, for example cylindrical, column 11 which is oriented approximately vertically in the use position of the processing machine 10. The column 11 can be releasably fastened at its lower end to a base plate 12 by means of a strap 13 and rises from the base plate 12.

A bearing bracket 14 is held on the column 11 so as to be longitudinally displaceable in the direction of the arrow 15. A working machine 16 in the form of a complete machine head 17, shown merely schematically, is fixedly attached to the bearing bracket 14. The machine head 17 is displaced with the bearing bracket 14 as a component fixed to the latter along the column 11 in the direction of the arrow 15. The machine head 17 shown by way of example of a working machine 16 has a housing, which is partly removed in Fig. 1 for greater clarity, leaving a front housing part 18. The machine head 17 has a drive motor with gearing, not S shown specifically, and a tool holding fixture 19, of which a drill chuck 20 with mounted drill 21 can be seen.

A rack 22 is fastened to or formed on the column 11, running approximately parallel to the longitudinal centre axis 23 of the column 11. Associated with the rack 22 is a gear 24 or pinion, which is connected in a rotationally fixed manner to a shaft 25 and is held rotatably together with the latter in the bearing bracket 14. A manually actuable rotary member 26, for example in the form of a rotary wheel, engages in a rotationally fixed manner on the shaft 25. By rotary actuation of the rotary meritber 26, the gear 24 engages in the rack 22. A rotary actuation of the gear 24 is thereby converted into a vertical movement of the bearing bracket 14 together with the machine head 17, so that the complete machine head 17 is moved in the direction of the arrow 15 both downwards in the drilling direction and in the opposite direction. In this way, the complete machine head 17 is moved, during the drilling and the raising in the opposite direction, respectively downwards and upwards according to the arrow 15 in Fig. 1, without any relative movement of parts of the machine head 17.

The bearing bracket 14 is acted on by a return spring 27, formed as a compression spring and in particular as a relatively powerful cylindrical helical spring, which surrounds the column 11 at a radial distance. The return spring 27 is supported at one end on the bearing bracket 14 or a part fixed thereto. The other end of the return spring 27 is supported on an axially spaced stop member 30. The stop member 30 is held on the column 11 so as to be adjustable in the longitudinal direction of the column and carries, via the return spring 27, the weight of the bearing bracket 14 with machine head 17, these latter being forced by means of the return spring 27 into an end position shown in Fig. 1, in which the bearing bracket 14 or a part thereof axially comes into abutment on the stop member 30, for example from below in Fig. 1. By adjusting the stop member 30 by relative displacement relative to the column 11, the machine head 17 can be set to the desired working position, in which, before starting work, the tip of the drill 21 is situated either in the position shown in Fig. 1 or in a lower or higher position relative thereto, as desired.

To set this desired working position of the machine head 17, the fixed connection of the stop member 30 to the column 11 must be released, it being necessary to connect the stop member 30 fixedly to the column 11 again after positioning in the working position. This is made possible by the fact that the stop member 30 has a slotted clamp 31 which can be tightened radially with respect to the column 11 by means of a pivotable clamping lever 32. In detail, the clamp 31 has owing to the slot two legs 33, 34 each with a bore 35 and 36 respectively, it being possible for a nut 37, threaded sleeve or the like to be arranged in a rotationally fixed manner at the end, for example, of the bore 35. A shaft 38, which passes through the bores 35, 36 and can be screwed at an end provided with a thread into the nut 37, is fastened to the clamping lever 32. The two legs 33, 34 embrace the column 11 and bear with a partially cylindrical inner surface against the outer surface of the column 11. On the actuation of the clamping. lever 32, the shaft 38 is screwed into the nut 37, whereby the two legs 33, 34 are drawn together and the clamp 31 is thus firmly tightened radially on the column 11. In the drawings, it is not shown specifically how the bearing bracket 14 comes into abutment on the stop member 30, for example from below in Fig. 1. A fixed part of the bearing bracket 14 serves this purpose. Simple positioning of the machine head 17 in the particular desired working position is possible by means of the clamp 31. For this purpose, the clamping lever 32 is actuated and the clamp 31 is thereby loosened. By rctary actuation of the rotary member 26 and via this of the gear 24 engaging in the rack 22, the machine head 17 can be adjusted in the direction of the arrow 15. After this, the clamp 31 is re-clamped. This clamping is simple and enables simple positioning of the machine head 17.

A guide rod 39, which runs approximately parallel to the column 11 and is guided in a through-passing guide opening 41 in an eye 40 in the stop member 30, is fastened to the bearing bracket 14.

On the positioning of the machine head 17 into the working position, owing to the weight of the bearing bracket 14 with machine head 17, this component could, on the loosening of the clamp 31, unexpectedly and rapidly move downwards along the column 11, and possibly fall suddenly.

This is prevented, however, by the fact that the stop member 30 has a braking device 50 cooperating with the column 11 to brake the bearing bracket 14 and engaging on the column 11. This braking device 50 can be provided on the clamp 31, although this is not shown. Instead and particularly advantageously, however, the braking device 50 is provided on a closed ring part 51 which is provided in addition to the clamp 31 as a further element of the stop member 30. The ring part 51 contains a cylindrical bore 52, through which the column 11 passes. The ring part 51 is in one piece with the clamp 31 and forms a guide of the stop member 30 on the column 11. The ring part 51 is arranged at an axial distance from clamp 31, for example below the latter.

A further component of the braking device 50 is at least one braking element, two braking elements 53, 54 of the same design being provided in the exemplary embodiment shown. At least one braking element 53 may be sufficient and is explained in more detail in the following with the aid of Fig. 6. The braking element 53 is directed transversely, in particular approximately radially, with respect to the longitudinal centre axis 23 of the column 11. It is pressed radially against the outer surface of the column 11 by means of the force of a compression spring 55.

The braking element 53 is formed from a plastic part 56, which is cylindrical for example and bears a guide projection 57 at the end facing away from the column 11.

The plastic part 56 forms a thrust piece. It is composed, for example, of the plastic material POM. The plastic part 56 and the compression spring 55 are held in a receptacle 58, open towards the column 11, of the stop member 30, in particular of the closed ring part 51. The receptacle 58 consists, for example, of a threaded bore. A screw 59, formed as a grub screw for example, which acts on the compression spring 55 is screwed into the threaded bore.

The screw 59 has a conical end 60 which engages in the compression spring 55 while guiding the latter. The compression spring 55 is therefore centred at one end on the guide projection 57 and guided at the other end by means of the conical end 60 of the screw 59.

The braking device 50 with the at least one sprung braking element 53, 54 ensures that, on the positioning of the machine head 17, a sudden, rapid downward movement along the column 11 does not occur, but the machine head 17 is protected from this by the braking device 50.

The design of the stop member 30 with the clamp 31 and with the separate closed ring part 51 with the braking device 50 is simple and requires only a small outlay. The stop member with the clamp 31 is easy to handle, safe operation and handling of the processing machine 10 being ensured owing to the braking device 50.

Claims

Claims 1. A processing machine of the upright type, in particular upright drilling machine, with a column, on which a bearing bracket for a working machine is held so as to be longitudinally displaceable, the bearing bracket being acted on by a return spring which is supported, on the one hand, on the bearing bracket and, on the other hand, on an adjustable stop member which is held on the column so as to be adjustable in the longitudinal direction of the column, and a complete machine head being fixedly attached to the bearing bracket as the working machine, which machine head contains in a housing a drive motor with gearing and has a tool holding fixture, characterised in that the stop member has a slotted clamp which can be radially tightened by means of a pivotable clamping lever, and in that the stop member has a braking device cooperating with the column to brake the bearing bracket and engaging on the column.
2. The processing machine according to Claim 1, characterised in that the stop member has in addition to the clamp a closed ring part, through which the column passes and which is guided on the latter.
3. The processing machine according to Claim 2, characterised in that the ring part is arranged at an axial distance from the clamp, for example below the latter.
4. The processing machine according to Claim 2 or 3, characterised in that the braking device is provided on the clamp or preferably on the ring part.
5. The processing machine according to one of Claims 1 to 4, characterised in that the braking device has at least one braking element, directed transversely, in particular approximately radially, with respect to the column axis and pressed against the column by means of spring force, and preferably in that the at least one braking element is formed from a plastic part and is held inside a receptacle, open towards the column, of the stop member, in particular of the closed ring part, and is pressed against the column by means of a compression spring received in the receptacle.
6. The processing machine according to Claim 5, characterised in that the receptacle is formed as a threaded bore containing a screw acting on the compression spring.
7. The processing machine according to Claim 5 or 6, characterised in that the plastic part has a guide projection which engages in the compression spring while guiding the latter.
8. The processing machine according to Claim 6 or 7, characterised in that the screw has a conical end which engages in the compression spring while guiding the latter.
9. A processing machine substantially as herein described with, reference to the accompanying figures.