GB2466384A

GB2466384A - Guiding device for a compass saw

Info

Publication number: GB2466384A
Application number: GB0922241A
Authority: GB
Inventors: Thilo Koeder
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2008-12-22
Filing date: 2009-12-18
Publication date: 2010-06-23
Also published as: CN101786187A; DE102008055074A1; GB0922241D0; RU2009147292A

Abstract

A guiding device for a manual machine tool 12a, such as a compass saw 14a, comprises a guiding unit 16a for directly receiving and guiding a selected tool 18a, and a reference means 20a. The reference means has a main extent 22a and the guiding unit has a main extent 24a, the main extent of the guiding unit extending at least substantially parallel with the main extent of the reference means. The reference means may be a housing 66a of the machine tool. Preferably, the guiding unit has two base bodies 54a, 56a, which are arranged substantially perpendicular to one another. A tool for the machine tool used with the guiding device may comprise a free end (64c, fig 6) , which is toothless for engagement with guiding unit. Preferably, the guiding unit comprises at least one resilient element (34b, fig 4) for pretensioning the guide unit.

Description

Guiding device

Prior Art

The invention sets out a guiding device for a manual machine tool, in particular for a manual machine tool in accordance with the pre-characterising clause of claim 1.

A guiding device has already been proposed for a manual machine tool, in particular for a compass saw, having a guiding unit which is provided for directly receiving and guiding a selected tool, and having a reference means.

Statement of invention

The invention sets out a guiding device for a manual machine tool, in particular for a compass saw, having a guiding unit which is provided for directly receiving and guiding a selected tool, and having a reference means.

It is proposed that the reference means has a main extent and that the guiding unit has a main extent, the main extent of the guiding unit extending at least substantially parallel with the main extent of the reference means. In this context, the term "guiding unit" is intended to refer in particular to a unit which substantially prevents incorrect positioning of a selected tool, such as in particular a compass saw blade, and/or the selected tool from deviating from an intended cutting line and consequently ensures that an operating result, such as, for example, a precise cut, is achieved in a clean, user-orientated manner, by precisely maintaining the desired cutting line, and/or that the selected tool is guided in a selective manner on the predetermined cutting line. The term "reference means" is intended in this instance to refer in particular to a means, such as a housing of the manual machine tool and/or a positioning device, which defines an orientation of the guiding unit. Furthermore, in this context, the term "directly receiving" is intended to refer to contact-related receiving, contact of the guiding unit at least at one side of the selected tool, such as the rear of a saw blade, preferably being carried out at least at two sides, such as two saw blade sides. The term "main extent direction of the guiding unit" is in particular defined by a region of the guiding unit which is in contact with the selected tool. The term "substantially parallel" is intended to refer to an orientation of the main extent of the guiding unit which preferably deviates by less than 15°, advantageously less than 10°, and in a particularly preferred manner less than 5° from the main extent of the reference means. In addition, the main extent of the guiding unit is orientated substantially perpendicularly relative to a travel direction of the selected tool.

Furthermore, the guiding unit preferably extends at the lower side of a cut during processing of a workpiece.

Furthermore, the term "provided" is intended to be understood as specifically equipped and/or configured.

Owing to the configuration according to the invention, the guiding of the selected tool can be adapted in a structurally simple manner to the structural conditions, for example, of the manual machine tool, and particularly reliable guiding can consequently be achieved.

Furthermore, it is proposed that the guiding unit is provided for substantially preventing movement of the selected tool in a direction perpendicular relative to the main extent of the reference means and perpendicular relative to the travel direction of a lifting means, whereby oscillations of the selected tool can be reduced by more than 90% and/or incorrect positioning of the selected tool caused by transverse forces which are brought about by tool tolerances owing to occurrences of non-homogeneity in the tool can be substantially prevented, which directly leads to the cut being guided in a particularly straight manner and consequently a satisfactory working result.

The guiding of the selected tool can be carried out in a particularly stable, reliable, precise and cost-effective manner if the guiding unit has at least one guiding element which is provided for at least partially receiving at least the selected tool. In this context, a "guiding element" is intended to refer in particular to an element which, owing to its contact with the selected tool at least at two sides of the selected tool, retains and/or fixes it in a desired position, preferably with respect to the reference means and/or the housing. The term "receiving the selected tool" is intended to refer in particular to storing the selected tool and/or receiving and/or redirecting forces acting via the selected tool. The use of the term "at least partially" is intended to refer in particular to receiving a region of the selected tool which is sufficient to fix the selected tool securely in a specific position relative to the reference means. The guiding element can be formed by a groove, an aperture, a roller, such as a conventional support roller, a U-like recess, a component having a U-shaped profile and/or another means which may appear advantageous to the person skilled in the art.

It is further proposed that the guiding unit has at least one resilient element which is provided for pretensioning the guiding element. The term "resilient element" is intended in particular to refer to an element, such as, for example, a spring and/or another element, which may appear to be advantageous to the person skilled in the art and which can convert inherently stored energy into a movement.

The spring is preferably constructed as a helical spring.

Using the resilient element, a feed movement of the guiding element can be synchronised in a structurally simple manner with a movement of the manual machine tool on a guiding means or the guiding element is guided by means of the resilient element in a cost-saving manner.

It may further be advantageous for the guiding unit to have at least one bearing element in which at least the guiding element is guided. In this context, the term "bearing element" is intended to refer in particular to an element which supports bearing forces of the guiding element and/or another component, such as the resilient element, and/or predetermines and/or limits a movement clearance of the relevant element. The bearing element is preferably constructed as a guiding rail. Owing to the construction of the bearing element, a movement, for example, of the guiding element, can be carried out in a reliable and selective manner.

It is further advantageous for the guiding device to have a guiding arrangement and for the guiding unit to be constructed at least partially integrally with the guiding arrangement. In this context, the term "guiding arrangement" is intended in particular to refer to an arrangement which guides the manual machine tool during an operation, such as, for example, processing a tool or carrying out the cut, and/or supports weight forces, of the manual machine tool. The term "at least partially integrally" is intended in particular to refer to the fact that at least one component of the guiding unit and a component of the guiding arrangement can be separated from each other only with the loss of function of at least one of the components. Owing to the integral configuration, it is possible to provide a particularly compact device which reduces the number of components.

In another configuration, it is proposed that the guiding device has at least one support unit for supporting a workpiece, the guiding unit being at least partially integrated in the support unit. The term "support unit" is intended to be understood in this instance to be in particular a unit on which the workpiece is supported at least as the cut is carried out and/or on which the weight forces thereof are supported by the unit. The term "at least partially integrated" is intended in particular to refer to the fact that at least a component of the guiding unit and a component of the support unit are constructed in an integral manner. Owing to the integration in the support unit, it is possible to achieve a space-saving arrangement by means of which the selected tool is guided in a selective and structurally simple manner with respect to the workpiece to be processed.

In addition, the invention sets out a manual machine tool, in particular a compass saw, which has a reference means and at least one guiding unit which is provided for directly receiving and guiding a selected tool.

It is proposed that the reference means has a main extent and that the guiding unit has a main extent, the main extent of the guiding unit extending at least substantially parallel with the main extent of the reference means. In this instance, the reference means is preferably formed by a housing of the manual machine tool.

It is further advantageous for the manual machine tool to have at least one securing element which is provided for securing the guiding unit to at least one sliding element.

In this context, the term "securing element" is intended to refer in particular to an element which is used for stationary fixing of the guiding unit. Preferably, the securing element is constructed so as to be able to be released from the sliding element and/or can be secured by means of a threaded portion. In general, however, any types of material, non-positive-locking and/or positive-locking securing means which might appear to be advantageous to the person skilled in the art would be conceivable and/or it would be conceivable to carry out securing to another component of the manual machine tool. In addition, the securing element may also be constructed integrally with the guiding unit. The term "sliding element" is intended in particular to refer to an element, such as a sliding block, which is used to support and/or guide the manual machine tool, for example, on an operating surface and/or on another means which may appear appropriate to the person skilled in the art. Owing to the production of the securing element, the guiding unit can be secured to the manual machine tool in a particularly robust and reliable manner.

In another configuration of the invention, it is proposed that the securing element extends substantially perpendicularly relative to the main extent of the reference means or the housing. The term "substantially perpendicularly" is intended to refer to an orientation of the securing element which preferably deviates by less than 15°, advantageously less than 100, and particularly preferably less than 5° from the main extent of the reference means. Owing to the perpendicular arrangement, it is possible to transfer force and/or redirect force from the selected tool to the sliding element in a particularly effective manner.

The invention further sets out a system having a manual machine tool which has a guiding unit and a guiding arrangement which is provided for guiding at least the manual machine tool.

It is proposed that a reference means of the manual machine tool has a main extent and that the guiding unit has a main extent, the main extent of the guiding unit extending at least substantially parallel with the main extent of the reference means. Owing to the configuration of the parallel arrangement according to the invention, the manual machine tool having the guiding unit can be used in a structurally simple manner with the guiding arrangement, whereby processing of the workpiece can be carried out in a particularly comfortable manner and whereby a clean working result is achieved.

It is further proposed that a guiding means of the guiding arrangement is supported so as to pivot over an angular

B

range of at least 90°. In this context, the term "guiding means" is intended to refer in particular to the portion of the guiding arrangement which is in direct contact with the manual machine tool as the workpiece is processed and/or which predetermines a movement direction of the manual machine tool. In this instance, when the manual machine tool is used with the guiding arrangement, the guiding unit is pivotably supported with the guiding means, whereby the manual machine tool can be aligned to carry out a specific cut in a structurally simple and user-friendly manner.

The invention further sets out a guiding unit for a selected tool of a manual machine tool, in particular a compass saw.

It is proposed that the guiding unit has two base bodies which each have a main extent, which are arranged substantially perpendicularly relative to each other. In this instance, one base body is preferably constructed as a securing element for securing to the manual machine tool or the sliding element and the other base body preferably serves to directly contact the selected tool, whereby a balanced force transfer between the selected tool and the manual machine tool can be achieved.

It is further proposed that at least one of the base bodies has a guiding element which is provided for at least partially receiving at least the selected tool. The guiding element is preferably constructed as a U-like recess and receives a portion of the selected tool at least at two sides, particularly at the two saw blade sides. Receiving in a supporting manner at a third side, such as the rear of the saw blade, would also be conceivable. Owing to the configuration according to the invention, it is possible to provide a support device which is open in the processing direction and which allows comfortable and user-friendly positioning of the selected tool.

The invention further sets out a selected tool, in particular a compass saw blade, for a manual machine tool and a guiding device.

It is proposed that the selected tool has an end region which is constructed so as to be toothless for engagement in a guiding element. In this context, an "end region" is intended to refer to a region of the selected tool which is arranged at an end that is opposite the end which corresponds to the tool receiving member and consequently, when the selected tool is mounted in the manual machine tool, faces away from the tool receiving member. The end region further extends over a length of the selected tool which corresponds to a length of more than 3 teeth, advantageously more than 4 teeth, and preferably more than teeth. Owing to the toothless configuration, it is possible to precisely guide the selected tool in a structurally simple manner in spite of the offset arrangement of the teeth.

Drawings Further advantages will be appreciated from the following description of the drawings. Three embodiments of the 3D invention are illustrated in the drawings. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will advantageously also consider the features individually and combine them to form other advantageous combinations.

In the drawings: Figure 1 is a manual machine tool having a guiding unit Figure 2 is a guiding arrangement having a guiding means for guiding the manual machine tool of Figure 1, Figure 3 is a system having a manual machine tool having a guiding unit from Figure 1 and a guiding arrangement from Figure 2, Figure 4 is a schematic illustration of a guiding device having a guiding arrangement and a guiding unit which is constructed integrally therewith, Figure 5 is an alternative guiding device for a selected tool having a toothless end region and Figure 6 is a detailed illustration of the selected tool of Figure 5.

Description of the embodiments

Figure 1 is a perspective view of a guiding device lOa having a guiding unit 16a for a manual machine tool 12a in the form of a compass saw l4a, and having a reference means 20a which is constructed as a housing 66a of the manual machine tool 12a and in which a drive motor which is not illustrated in greater detail in this instance is arranged.

The guiding unit 16a has a main extent 24a which extends parallel with the main extent 22a of the reference means 20a and the housing 66a, the guiding unit 16a being provided for directly receiving and guiding a selected tool l8a.

The compass saw 14a further has a drive unit 68a which transmits a lifting movement in a travel direction 28a and thereby drives a lifting means 30a, such as a lifting rod, with a continuous upward and downward movement during operation of the compass saw 14a. The lifting means 30a has a tool receiving member 70a which carries the selected tool 18a in the form of.a compass saw blade 62a.

At a lower side 72a of the housing 66a associated with the tool receiving member 70a, there is arranged a sliding element 46a in the form of a sliding block, to which the guiding unit 16a for the selected tool 18a is releasably secured by means of a threaded portion which is not illustrated in detail. The guiding unit 16a has two base bodies 54a, 56a which each have a main extent 58a, 60a which are arranged perpendicularly relative to each other.

The guiding unit 16a or the base body 56a has a guiding element 32a which is constructed integrally with the guiding unit 16a or the base body 56a and which is constructed as a U-like recess, a leg 74a of the U-like profile (only one leg is illustrated in Figure 1) extending in the direction 24a of the main extent along a saw blade side 76a and a base portion of the U-like profile (not illustrated in detail) extending perpendicularly relative to the direction 24a of the main extent along a rear 78a of the saw blade. Owing to the arrangement of the U-like recess at three sides of the selected tool 18a, the guiding element 32a receives the selected tool 18a over a width 80a which corresponds to a width BOa of the guiding element 32a, whereby the base body 56a assumes a guiding function.

By means of the guiding element 32a and the engagement of the selected tool 18a in the U-like recess, the guiding unit l6a can prevent movement of the selected tool lBa in a direction 26a perpendicular relative to the main extent 22a of the reference means 20a and the housing 66a and perpendicular relative to the travel direction 28a of the lifting means 30a.

In addition, the manual machine tool 12a or the guiding unit 16a has a securing element 44a which secures the guiding unit 16a to the sliding element 46a by means of the threaded portion which is not illustrated. The securing element 44a is formed by the base body 54a and consequently extends perpendicularly relative to the main extent 22a of the reference means 20a and the housing 66a. The securing element 44a additionally determines, owing to its arrangement relative to the tool receiving member 70a, a maximum operating depth 82a, whereby it is determined that, during processing of a workpiece 42a, only the selected tool 18a penetrates the workpiece 42a.

Figure 2 is a perspective view of a guiding arrangement 38a for guiding the manual machine tool 12a including the guiding unit l6a and for carrying out a cut 84a with a straight cutting line in the workpiece 42a. For this guiding, the guiding arrangement 38a has a guiding means 50a which is constructed as a metal sliding rail, on the upper side 86a of which the manual machine tool 12a can be supported and/or guided in a movement direction or an operating direction 88a by means of its sliding element 46a. In addition, the guiding is ensured by a guiding slot 90a which extends in the operating direction 88a along the guiding means 50a and through which the selected tool lBa and the guiding unit 16a extend during the operation when viewed in the travel direction 28a (see also Figure 3) At the ends 92a of the guiding means 50a, there are arranged at a lower side 94a perpendicular relative to the guiding means 50a securing means 96a, in the form of rods, which connect the guiding means 50a to a positioning device 98a which serves to support the guiding arrangement 38a, for example, on an operating surface, such as a table. On the positioning device 98a, there is arranged an adjustment means lOOa in the form of a semi-circular disc of wood, by means of which a desired cutting angle can be adjusted for a cut 34a in the workpiece 42a by an operator via an angular scale 102 using a lever 104a which is arranged on the positioning device 98a.

In order to support the workpiece 42a, the guiding arrangement 38a has a support unit 40a of wood which is formed by an angular component arrangement 106a with a support component lO8a and a support component llOa. The support component llOa is interrupted by a round component ll2a which can be adjusted together with the adjustment means lOOa and which also acts as a support face and in which there is formed an aperture 114a which extends in the operating direction 88a and in which the selected tool 18a can be introduced during the processing of the workpiece 42a in order to carry out the cut 84a in the operating direction 88a and in the travel direction 28a. The round component 112a and therefore the aperture 84a and consequently the desired cutting angle can be adjusted by rotating the adjustment means lOOa. Owing to the rotation, the guiding means 50a of the guiding arrangement 38a is supported so as to be able to pivot over an angular range 52a of 180° and is adjusted in a similar manner to the aperture 114a, whereby it is possible to achieve good guiding of the selected tool 18a with respect to the desired cut 84a.

Figure 3 illustrates a system 48a having a manual machine tool 12a and having a guiding unit 16a and a guiding arrangement 38a in an arrangement for carrying out a cut 84a through the workpiece 42a, with the cut 84a already having been carried out in this instance for reasons of clarity.

Figures 4 to 6 illustrate two alternative embodiments of the guiding device lOa and the guiding arrangement 38a. In principle, components, features and functions which remain the same are substantially given the same reference numerals. However, in order to differentiate between the embodiments, the letters a to c are appended to the reference numerals of the embodiments. The following description is substantially limited to the differences from the embodiment in Figures 1 to 3, reference being able to be made to the description of the embodiment in Figures 1 to 3 with reference to components, features and functions which remain the same.

Figure 4 is a sectioned illustration of a guiding device lOb for a manual machine tool 12b in the form of a compass saw 14b having a guiding unit 16b and a reference means 20b which is integrated in a guiding arrangement 38b for carrying out a cut (which is not illustrated in this instance) through a workpiece 42b. The guiding unit 16b and the guiding arrangement 38b form a system 48b together with the manual machine tool 12b.

The guiding arrangement 38b has the reference means 20b in the form of a base portion 116b, at the opposing ends 118b of which two legs 120b, l22b which extend perpendicularly relative to the base portion 116b extend. At the open end 124b of the legs 12Db, 122b, the legs 12Db, 122b each form a support face for a guiding means 5Db having a guiding slot 9Db, the manual machine tool 12b being supported on the guiding means 5Db or guided in an operating direction 88b as a workpiece 42b is processed. The guiding means 5Db is connected, by means of securing means 9Gb, to a positioning device 98b on which the base portion ll6b of the guiding arrangement 38b is supported.

In order to support the workpiece 42b, the guiding arrangement 38b forms a support unit 4Db of wood, the support component ilOb of which is orientated perpendicularly relative to the support component 108b thereof which is formed by the leg l2Ob. The guiding unit 1Gb is arranged at a lower side l26b of the support component 11Db perpendicularly relative to the support component lDBb and connects the two legs 12Db, 122b, whereby the guiding unit 16b is constructed at least partially integrally with the guiding arrangement 38b and is consequently integrated in the support unit 4Db. Owing to this arrangement, the guiding unit 16b is arranged at a lower side of the cut of the workpiece 42b or below the cut. In addition, the operating depth of the selected tool l8b is not limited.

The guiding unit 16b further has a main extent 24b which extends parallel with a main extent 22b of the reference means 2Db and the base portion ll6b of the guiding 3D arrangement 38b and it prevents movement of the selected tool 18b in a direction 26b which is orientated perpendicularly relative to the main extent 22b of the reference means 2Db and perpendicularly relative to a travel direction 28b of a lifting means 30b of the manual machine tool 12b (indicated only schematically in this instance) . The guiding unit 16b is formed by two guiding rails 128b (only one can be seen in Figure) which are arranged with a spacing which extends parallel with the base portion ll6b and which is so wide that a selected tool l8b in the form of a compass saw blade 62b with offset teeth l3Ob can be guided therein in a contact-free manner.

The spacing is spanned by a guiding element 32b which carries a U-like component 132b which receives the selected tool 18b with the two legs 74b thereof and the base portion thereof at three sides, that is to say, at two saw blade sides 76b and at a saw blade rear 78b. In addition, the guiding rails l28b constitute a bearing element 36b in which the guiding element 32b is guided. The guiding unit 16b further has, for pretensioning the guiding element 32b, a resilient element 34b in the form of a slightly pretensioned helical spring which is supported and guided in the bearing element 36b. When the manual machine tool 12b is guided on the guiding means 50b, an advance movement of the guiding element 32b by means of the resilient element 34b can be synchronised with the movement of the manual machine tool l2b.

In order to move the guiding element 32b to the initial position thereof again after a cut has been made in the workpiece 42b and thereby reproduce the pretensioning of the resilient element 34b or the helical spring, the guiding arrangement 38b has a restoring pin 134b which engages on the guiding element 32b at the side facing away from the component l32b, extends along the extent of the resilient element 34b or the helical spring and extends out of the guiding arrangement 38b through an opening in the leg 122b.

Figure 5 is a sectioned illustration of an alternative guiding device 10c for a manual machine tool l2c, constructed as a compass saw 14c, having a guiding unit 16c which is constructed integrally with a guiding arrangement 38c and having a reference means 20c integrated in the guiding arrangement 38c for carrying out a cut which is not illustrated in greater detail through a workpiece 42c. The guiding unit 16c has a main extent 24c which extends parallel with a main extent 22c of the reference means 20c and a base portion 116c of the guiding arrangement 38c and it prevents movement of a selected tool lSc in a direction 26c which extends perpendicularly to the main extent 22c of the reference means 20c and perpendicularly relative to a travel direction 28c of a lifting means 30c (illustrated here only schematically) of the manual machine tool 12c. In this instance, the guiding unit l6c has, for receiving the selected tool 18c, a guiding element 32c which is formed by a groove 136c. To this end, the two sides 138c (in Figure 5 only one side is illustrated) of the groove l36c are in abutment against two saw blade sides 76c of the selected tool l8c. To this end, the selected tool 18c, which is formed by a compass saw blade 62c, has an end region 64c which is constructed so as to be toothless for engagement in the guiding element 32c. The end region 64c, as can be seen in Figure 6, is arranged at an end 140c of the selected tool l8c that is opposite the end 142c corresponding to a tool receiving member 70c. The end region 64c further extends over a length 144c which corresponds to a length 144c of approximately 4 teeth 130c of the compass saw blade 62c. Owing to the toothless end portion 62c, the selected tool l8c can engage in the groove 136c with contact at both sides 138c of the groove l36c, although a saw-tooth profile 146c of the selected tool lBc can be constructed so as to be offset. Owing to the configuration of the guiding unit 16c with a groove 136c, the operating depth of the selected too]. 18c is not limited.