EP1693170B1 - Protective and guiding device for a cutting or grinding apparatus and cutting or grinding apparatus with such a protective and guiding device - Google Patents

Abstract

The protection and guiding device (2) has a degree of freedom which is independent of translatory degree of freedom between housing (1) and tool (8). An outlet for the tool is so arranged in the device so that the tool can penetrate both the outlets. An independent claim is also included for separating and grinding device.

Description

Technical area

The invention relates to a protective and guiding device according to the preamble of claim 1 and to a device according to the preamble of claim 8.

Such a device and such a device are out DE 100 12 208 A1 known.

definitions

The device described herein has the function of machining objects mechanically. In particular, it is provided to saw selected objects, or otherwise separate. The term "machining with the device or its tool" is understood as cutting, milling, grinding, planing or similar mechanical machining. In the following, only separation or grinding is used, in which case all the aforementioned processing methods are understood.

The term "protection and guidance device" is understood to mean a device which can be adapted as an adapter to a drive unit, for example to a hand-held machine tool the size of a hand drill. In this case, the tool and drive unit form a unit which are movable relative to the protective and guide device. As a rule, the protective and guiding device serves to receive a tool, for example a cutting disc or a saw blade, this being completely enclosed. Furthermore, the protective and guide device serves as a system and guide device, so that by moving the drive unit, the tool for separating, grinding or the like from the protective and guide device during the machining process can be brought out.

The term "backdrop" means means that cause the tool to move relative to the protection and guide means. For example, the backdrop may be a slot guide in the protective and guiding device is provided. The bearing of the rotating tool is guided along this slot guide. Furthermore, the term "gate" is understood to mean a guide device on which slides are guided, for example.

State of the art

When renovating old buildings, it is known that window frames must be removed from the masonry, so that they can be replaced by new ones. For this purpose, it is necessary to remove the usually formed from wood frame by means of a separator of the masonry. Here, in particular, metal elements that fix the frame to the masonry to remove in a separate or the same step.

From the prior art, for example, from the DE 44 29 388 A1 Both a method and a device for replacing a window known. The method is characterized in that a frame of a window to be renovated is separated out with a device according to the invention. Said device has a tool in the form of a cutting disc, which is arranged rotatably and pivotally on a fixing device. By this arrangement, it is possible that the cutting disc in the corners of a window frame and in the corners, formed by window frames and masonry, can penetrate. Preferably, the separator penetrates obliquely, for example at an angle of 45 degrees.

In order to allow the penetration of the cutting disc, it is provided to move the cutting disc translationally in a predetermined direction.

From the DE 299 09 449 U A device is also known by means of which, in particular in the window area, metal parts which fix the window frame can be removed.

The hand-held implement presented herein has a drive unit, wherein the drive unit is coupled to a protective and guide device. Within the protection and guide device a cutting disc is mounted. The cutting disc is in turn directly coupled to the drive unit and is rotated by this. Drive unit and cutting disc are movable relative to the protection and guide device. The protective and guide device itself is designed such that in the idle state, the cutting disc is arranged directly in the housing. This avoids that the cutting disc is damaged in any way during transport and further avoids that people can be injured by improper handling of the manual tool. As a result of the relative movements, when the protective and guiding device is firmly in contact, the separating disk can be moved translationally in one direction in such a way that it emerges from the protective and guiding device via an outlet opening. If the entire hand tool is removed from the processing situation, then a return mechanism ensures that the cutting wheel is automatically guided back into the protective and guiding device.

The user usually attacks the manual tool on the drive unit, sets the manual tool together with the protection and guide device to the window frame and triggers the drive or the rotation of the tool. A translational movement - caused by a manual movement - causes the rotating cutting disc to be fed with an advance and thus brought into a single predetermined defined direction. In this case, the cutting disc exits the protective and guiding device, wherein the protective and guide device itself remains stationary. If processing in a further direction is desired, the workflow process is repeated in such a way that the protective and guide device is newly set together with the drive unit. However, the processing can only be done in one direction. Processing in the range of an angle, for example within a window corner, is not possible in this way.

As a rule, it is remedied that the protective and guide device is set obliquely together with the drive unit in the corner of a window frame. The danger, however, is that the per se at right angles formed protective and guide device is not completely rests and thus only selectively loaded and the user is exposed to an increased risk of injury. In addition, a good quality cut result is not to be expected in this way. Furthermore, the user is exposed to a high dust load.

Another disadvantage of the known device is that the user must apply directly to the drive unit with its power guide, so that a torque is created, which means that the protection and guide device can not lie correctly flat at the preferred angle.

From the EP 0 109 632 A1 is a protective housing for a saw blade of a circular saw known. The saw blade is mounted centrally on a saw shaft, which in turn is mounted on a sliding saw carriage. The saw blade can be guided along a slot gate in one direction to an outlet opening in the protective housing.

From the GB 1 107 316 is also known a protective housing in which a saw blade is mounted. The protective housing is specially designed in its contour so that it can be attached to a corner formed at an angle of 90 degrees. The saw blade can be guided from an exit opening into the angle. Again, the blade is feasible along a slot gate with a translational degree of freedom.

From the US Pat. No. 4,022,182 is a portable protective housing for a saw blade of a circular saw known. The saw blade can be guided out of the protective housing along a slot gate (which has a radius in the example shown here).

From the DE 100 12 208 A1 a device for milling is known. The device shown herein comprises a protective and guiding device for mounting on a drive unit, which consists of a substantially hollow housing with a rotating tool in the form of a milling or cutting disc. Furthermore, the device is developed in such a way that the tool passes through one of the housing-forming support plate through one or more open slots. Furthermore, the housing has a retractable part. The retractable part forms an outlet opening for the tool, which at least partially penetrates the tool.

The aforementioned embodiments of the prior art all have the disadvantage that they can only be used for a specially designed application. A flexible application such that the saw blade either to one or to other side or in the angle is feasible, is not provided. Different special versions of protective housings or protective and guiding equipment are necessary for each of the above-mentioned applications. In addition, only the movement of the tool in a given direction is possible.

Object of the invention

The object of the invention is to develop the protective and guiding device and a device with such a device such that at least one disadvantage of the prior art is avoided.

Solution of the task

This object is solved by the features of claim 1 or claim 8. Further advantageous embodiments can be found in the dependent claims 2 to 7 and 9.

Advantages of the invention

The invention is based on one of the significant advantages that acute angle, but also obtuse angles can be achieved equally by the two translational movements of the tool, which is arranged in its initial position within the protective and guiding device. For this it is not necessary, the protection and guide device together with the drive unit in a not for it create provided angle. It is sufficient if the protective and guiding device is arranged flat on a support, for example on a window sill or on a window frame.

For the processing it is provided that by moving the drive unit, for example by a arranged on the drive unit handle, a relative movement between the protective and guide means and the drive unit can be exercised, the movements being predetermined by arranged scenes. It can be provided that the relative movement against a predetermined force, such as a spring force, must be exercised. This has the advantage that when not operating the drive unit, the tool is automatically returned to the housing of the protection and guide device. In one embodiment, the protection and guide device is guided against a stop and predetermined by guiding the drive unit, the direction of the tool. In a particularly preferred example, the links formed as linear guides are arranged perpendicular to each other, so that either either the tool in a direction translational or in the other direction can be moved translationally, as needed. Due to the fact that two translational degrees of freedom are provided, the tool can be positioned as desired within the plane defined by linkages (in this case linear guides).

Preferably, the scenes extend perpendicular to the longitudinal extent of the regions of the outlet opening, wherein the two regions of the outlet opening almost correspond to the side walls of the cuboid protective and guide device. The respective adjacent side walls form this outlet opening. Thus, for example, there is the possibility of first guiding the device along the one link (for example spatially horizontally) and subsequently guiding the device along the further link (for example spatially vertically). Furthermore, it is possible to guide the device simultaneously along the respective scenes, so that, for example, diagonally into an angle the tool can penetrate into the material to be processed.

According to the invention, therefore, that in each case of application, the tool is movable so that it can at least partially escape at least at two mutually adjacent areas of an outlet opening of the preferably cuboidal protection and guide device.

In order to move the protective and guide device relative to the drive unit independently of the two given directions, it is provided to arrange the translationally arranged guide elements in the formation of scenes in two mutually different planes. For this purpose, the invention proposes to form the two levels like a slide and each to be provided with linear guides, which are arranged perpendicular to each other. Optionally, any position can be locked in one direction.

In a preferred embodiment, the protective and guiding means comprise side walls which are removable from the protective and guiding means. In this way, a quick tool change can be done.

In contrast to the prior art, the device according to the invention has a drive unit and a protective and guide device, wherein the drive unit comprises a motor having a drive spindle. The drive spindle can be coupled to the drive shaft of the tool, which is arranged within the protective and guide device. In the preferred embodiment, the drive spindle, the drive unit and the drive shaft of the protection and guide device are not coaxially. Preferably, these are optionally arranged with an offset in horizontal alignment and / or an offset in vertical alignment with each other. As a result, a better geometry and thus better handling of the device, in particular with respect to the relative movements to be performed, can be achieved. So it is also possible to increase the offset depth of the tool from the device by the staggered arrangement.

Another significant advantage of the invention is that the user does not have to perform the relative movements by gripping the drive unit, comparable to the prior art. It is envisaged that in the region of the wall of the protective and guide device, coupled with the drive unit, a special grip device is provided, which allows the device to handle directly opposite to the cutting plane. This has considerable ergonomic advantages and in particular means that the tool can be guided in the defined directions easily and accurately and work safely.

A preferred embodiment of the housing device provides that the respective areas of the outlet opening are covered by flaps. These flaps open automatically as soon as the tool wants to emerge from the outlet opening. When not in use, the corresponding flaps offer a respective protection against injury and destruction of the tool.

A special embodiment provides that upon exit of the tool from the outlet openings, the respective position of the tool can be locked. This ensures that no additional force is required for further propulsion of the tool in only one direction, since working against the spring force caused by the safety device in the protective and guide device, eliminated. As soon as the inventive device is raised, the lock automatically releases, so that any regulations are taken into account by moving the tool back into the protective and guide device when lifting the device from a working surface. In a corresponding overrun the tool is thus completely surrounded by the housing device and not accessible to the user.

In order to prevent that chips, which are incurred by the machining with the tool, remain within the protective and guide device, at least one suction device is provided opposite the respective regions of the outlet opening. The suction device is advantageously designed such that one known from the prior art Vacuum cleaner tube can be plugged in a simple manner. This can also remove the dust generated by the processing.

Another particular embodiment advantageously provides that the protective and guide device is provided with a flange, via which the drive unit can be coupled to the protective and guide device. Further, a rotational degree of freedom between the drive unit and the flange may be provided, which arbitrarily includes each angle. Locking in a defined position is also possible.

This has the advantage that on the one hand, the drive unit can be arranged at different angles to the protection and guide device, so that depending on the application, the arrangement can be made accordingly. In addition, it brings with it the further advantage that, depending on the application, different drive units, for example in different lengths or even in different performances, can be coupled to the protective and guide device.

It is furthermore provided that the protective and guiding device or the device comprises a laser pointer. This offers the advantage that during processing the user can be shown the optimum cutting guidance, for example in the form of a processing line or in the form of a target point.

Compared to the prior art, the invention also has the advantage that the distance between the tool and a lateral stop, usually formed by the protective and guiding device, is extremely low. This makes it possible to perform the processing very close to the stop.

Further advantageous embodiments will become apparent from the following descriptions, the drawings and the claims.

Drawings:

Fig. 1

Eine erste perspektivische Ansicht auf das erfindungsgemässe Gerät zusammen mit der erfindungsgemässen Schutz- und Führungseinrichtung, jedoch ohne Abdeckplatte auf der Schutz- und Führungseinrichtung;

Fig. 2

eine weitere Ansicht des in Fig. 1 dargestellten erfinderischen Gerätes;

Fig. 3

eine Seitenansicht auf das erfindungsgemässe Gerät gemäss Fig. 1;

Fig. 4

eine Vorderansicht auf das erfindungsgemässe Gerät gemäss Fig. 1;

Fig. 5

eine Prinzipdarstellung zur Erläuterung der Relativbewegungen der Schutz- und Führungseinrichtung zu dem Werkzeug;

Fig. 6

eine schematische Darstellung der einer möglichen Anordnung des Werkzeugs relativ zur Schutz- und Führungseinrichtung;

Fig. 7

eine weitere schematische Darstellung der Anordnung des Werkzeugs relativ zu der Schutz- und Führungseinrichtung;

Fig. 8

eine dritte schematische Darstellung der Anordnung des Werkzeugs relativ zur Schutz- und Führungseinrichtung.

Show it:

Fig. 1

A first perspective view of the inventive device together with the inventive protection and guide device, but without cover plate on the protection and guide device;

Fig. 2

another view of the in Fig. 1 illustrated inventive device;

Fig. 3

a side view of the inventive device according to Fig. 1 ;

Fig. 4

a front view of the inventive device according to Fig. 1 ;

Fig. 5

a schematic diagram for explaining the relative movements of the protective and guiding means to the tool;

Fig. 6

a schematic representation of a possible arrangement of the tool relative to the protective and guiding device;

Fig. 7

a further schematic representation of the arrangement of the tool relative to the protective and guiding device;

Fig. 8

a third schematic representation of the arrangement of the tool relative to the protective and guiding device.

Description of an embodiment

In the FIGS. 1 to 8 in each case an inventive protection and guide device 1 as well as an inventive device 2 is shown.

The protective and guide device 1 comprises a housing 3, which is formed substantially hollow and a cavity 4 shows. At the in FIG. 1 illustrated embodiment the housing 3 is formed almost square and has - for better representation - at least only one side wall 5. At the end faces schematically an outlet opening 6 is shown, which is divided into two areas. In this case, the outlet opening 6 has a first region B1 and a further region B2. The longitudinal extension of the first region B1 of the outlet opening 6 is arranged at an angle to the longitudinal extent of the further region B2. The angle is 90 degrees in the embodiment presented in the drawings. This means that the two areas are aligned perpendicular to each other.

Within the housing 3, a tool 8, here in the formation of a cutting disc, added. The bearing of the tool 8 via a drive shaft 9, wherein the drive shaft 9 is supported by means not shown in detail and is at least indirectly coupled to a drive unit 10. The drive unit 10 comprises, in FIG. 4 shown, a drive spindle 11. A holding element 17 is attached to the protective and guide device 1. Furthermore, the housing device 1 has a wide footprint SF. It serves to press the protective and guide device 1 with this footprint SF against a stop, for example a windowsill.

As in FIG. 2 shown, the drive unit 10 relative to the protective and guide device 1 in the direction of arrow 12 and the housing device 1 relative to the housing 3 in the direction of arrow 13, preferably via the holding member 17 movable. In addition to the in FIGS. 4 and 8th shown scenes K ₁₂ , K ₁₃ provides a in FIG. 2 illustrated horizontal slide 14 and a vertical slide 15 for the corresponding relative movement between the drive unit 10 and the protective and guide device 1. The horizontal slide 14 is coupled to the drive unit 10.

The drive unit 10 is flanged directly to the protective and guide device 1 in the embodiment shown here. It is also conceivable that a differently configured drive unit 10 or even a drive unit already known from the prior art, for example, a cutting disc machine is coupled.

Furthermore, the protective and guide device 1 has a suction device 16 to which a suction tube with an active suction can be connected directly.

The retaining element 17 is arranged at least indirectly on the drive unit 10 so that a relative movement in the direction of arrow 12, 13 between the drive unit 10 and the protective and guide device 1 can be performed in an ergonomic manner.

The protective and guide device 1 itself has at the respective areas B1, B2 of the outlet opening 6 each flaps, which, however, are not shown here in detail for reasons of representation. These flaps serve to prevent the tool 8 from being damaged or that the user is in any way injured by the tool 8, which may still be rotating.

In FIG. 4 is coupled to the housing 3 via the gate K _{13 of} the vertical slide 15. The horizontal slide 14 is coupled to the vertical slide 15 via the guide K ₁₂ , the drive unit 10 being connected directly to the horizontal slide 14.

At the in FIG. 4 illustrated embodiment, the tool 8 only a small distance 19 to a processing surface, not shown. The distance 19 is approximately 5 mm. In the prior art, the distance is about 15 to 25 mm, so that the distance in the inventive device by about three to five times smaller.

In the FIGS. 5 to 8 the principle of the relative movement between the housing device 1 and the drive unit 10 will be explained.

In FIG. 5 the drive spindle 11 of the drive unit 10 is shown to the drive shaft 9 of the tool 8 in an offset V ₁₂ in a horizontal orientation and an offset V ₁₃ in a vertical orientation. Thus there is no direct, but an indirect coupling. The tool 8 itself rotates due to the rotational movement of Drive shaft 9 or drive spindle 11 in the direction of arrow 18. The housing 3 has at its respective two end faces, which are arranged directly adjacent to each other, the outlet opening 6 with the two areas B1, B2.

functionality

In a first position of the vertical slide 15 of the protective and guide housing 1 along the scenes K _{13 of} the protective and guide housing 1, for example, moved by movement of the holding member 17 in the direction of arrow 13. In this case, the tool 8 emerges from the housing 3 by a corresponding distance from the first region B1 of the outlet opening 6. The tool 8 can be guided in this direction of the arrow 13 until a maximum cutting depth S ₁₃ in the vertical direction has been reached ( Fig. 6 ).

In a second position, the horizontal slide 14 along the scenes K _{12 of} the protective and guide housing, for example, by movement of the holding member 17 in the direction of arrow 12 moves. In this case, the tool 8 comes out of the housing 3 by a corresponding distance from the wider area B2 of the outlet opening 6 out. The tool 8 can be guided in this direction of the arrow 12 until a maximum cutting depth S ₁₂ in the horizontal direction has been reached ( Fig. 7 ).

In FIG. 8 an extreme position of the tool 8 is shown. The tool 8 can be made either from the in FIG. 6 shown position by movement of the holding member 17 in the direction of arrow 13 or from the second position, as in FIG. 7 is shown, carried out by movement of the holding member 17 in the direction of arrow 12, without the actual protective and guide housing 1 is removed from its actual position. Thus, the tool 8 from its position in the protective and guide device 1 position ( FIG. 5 ) in different ways in a position, which is characterized in that the tool 8 and its drive shaft 9, each position in a in FIG. 8 represented quadrant Q can take. It is not necessary that the sequence of movements is complied with. In the quadrant Q any position can be achieved by any method of the holding member 17 in the direction of arrow 12 and / or in the direction of arrow 13.

In FIG. 8 It can be seen that by the staggered arrangement of the drive shaft 9 to the in FIG. 5 shown drive spindle 11, the maximum depth of cut S ₁₂ , S ₁₃ exactly is reached when the drive shaft 9 adjacent to the protective and guide device 1. In the case of a non-staggered arrangement of drive shaft 9 to drive spindle 11, the maximum depth of cut S ₁₂ , S ₁₃ by the outer dimensions of the drive unit 1, such as the housing shape, limited, with the result that in this case small depths of cut can be achieved.

Due to the inventive protection and guide device 1, it is possible that in a single operation both horizontally and vertically and a combination thereof, the tool 8 can be brought into use without a new arrangement of the entire device 2 is necessary.

LIST OF REFERENCE NUMBERS

1.

Protection and guidance device

Second

device

Third

casing

4th

cavity

5th

Side wall

6th

outlet opening

7th

(not occupied)

8th.

Tool

9th

drive shaft

10th

drive unit

11th

drive spindle

12th

arrow

13th

arrow

14th

horizontal slide

15th

vertical slide

16th

suction

17th

retaining element

18th

arrow

19th

Distance to the working surface

Q

quadrant

K ₁₂

scenery

K ₁₃

scenery

S ₁₂

cutting depth

S ₁₃

cutting depth

V ₁₂

offset

V ₁₃

offset

SF

footprint

B1

Area

B2

Area

Claims (9)

1. Protective and guide device for mounting on a drive unit for cutting and/or grinding materials, in particular for cutting out windows, doors and the like fitted in masonry, the protective and guide device consisting of

   - an essentially hollow housing having a rotating tool in the form of a cutting disc, abrasive disc or the like, and

   - a translational degree of freedom between housing and tool, such that the tool can be displaced relative to the housing, and

   - an outlet opening through which the tool can pass at least partly,

   characterized in that

   - at least one further translational degree of freedom, independent of the one translational degree of freedom, is provided between housing (1) and tool (8), and

   - the outlet opening (6) has two regions, namely a first region (B1) and a further region (B2), the longitudinal extent of the first region (B1) of the outlet opening (6) being arranged at an angle to the longitudinal extent of the further region (B2),

   such that the tool (8) can optionally pass through

   - the first region (B1),

   - the further region (B2), or

   - both regions (B1 and B2).
2. Protective and guide device according to Claim 1, characterized in that at least one rotational degree of freedom is provided between protective and guide device (1) and tool (8).
3. Protective and guide device according to Claim 1 or 2, characterized in that at least one degree of freedom can be fixed.
4. Protective and guide device according to Claim 1, characterized in that two links (K₁₂, K₁₃) independent of one another are provided for realizing the translational degrees of freedom, the links (K₁₂, K₁₃) being arranged perpendicularly to one another.
5. Protective and guide device according to Claim 4, characterized in that the two links (K₁₂, K₁₃) are arranged in different planes.
6. Protective and guide device according to at least one of Claims 4 or 5, characterized in that the links (K₁₂, K₁₃) are designed as a horizontal slide (14) and a vertical slide (15), respectively.
7. Protective and guide device according to Claim 1, characterized in that the regions (B1, B2) of the outlet opening (6) are each provided with a flap which is closed in the state in which the tool (8) does not pass through the one outlet opening (6).
8. Apparatus for cutting and/or grinding materials, in particular for cutting out windows, doors and the like fitted in masonry, having a protective and guide device consisting essentially of

   - an essentially hollow housing having a rotating tool in the form of a cutting disc, abrasive disc or the like, and

   - a translational degree of freedom between housing and tool, such that the tool can be displaced relative to the housing, and

   - an outlet opening through which the tool can pass at least partly,

   - and a drive unit which can be coupled at least indirectly to the tool,

   characterized in that

   - at least one further translational degree of freedom, independent of the one translational degree of freedom, is provided between housing (1) and tool (8), and

   - the outlet opening (6) has two regions, namely a first region (B1) and a further region (B2), the longitudinal extent of the first region (B1) of the outlet opening (6) being arranged at an angle to the longitudinal extent of the further region (B2),
   such that the tool (8) can optionally pass through

   - the first region (B1),

   - the further region (B2), or

   - both regions (B1 and B2).
9. Apparatus according to Claim 8, characterized in that it comprises a protective and guide device (1) according to at least one of Claims 2 to 7.

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