Miter angle stop

A device for setting the miter angle of a machine tool is disclosed. The device includes a clamping block having at least one slot, and a pivot lever on which the machine tool can be mounted and which is pivotable about a pivot point relative to the clamping block between a minimum and a maximum miter angle. The slot includes at least two stop elements offset relative to one another. A setting mechanism includes a lever element for the selection of a maximum miter angle, where the lever element includes a mating stop element is alignable in such a way corresponding to the rotational alignment of the lever element that the mating stop element is able to strike the respective stop element in accordance with the selected maximum miter angle and by which the pivoting movement of the pivot lever relative to the clamping block can be limited.

This application claims the priority of International Application No. PCT/EP2015/052831, filed Feb. 11, 2015, and European Patent Document No. 14155132.5, filed Feb. 14, 2014, the disclosures of which are expressly incorporated by reference herein.

BACKGROUND AND SUMMARY OF THE INVENTION

The invention presented here relates to a device for setting the miter angle of a machine tool, in particular a circular saw, comprising a clamping block having at least one slot, and to a pivot lever, on which the machine tool can be mounted and which is supported such that the pivot lever can be pivoted around a pivot point relative to the clamping block between a minimum miter angle and a maximum miter angle.

For a variety of machine tools, it is advantageous for the angle between an essentially horizontal guide plane and an essentially vertical work plane of the tool, i.e., one that is positioned at a right angle in relation to the horizontal guide plane, to be adjustable. The angle adjustment and/or angle setting of the vertical work plane of the saw-blade in relation to the horizontal guide plane of the saw is an important feature of the circular or compass saw, in particular. This setting possibility is especially important for the selection of the miter angle.

An angle setting device for application in a machine tool, in particular a circular saw, is disclosed according to prior art in the U.S. Pat. No. 5,433,008. In particular, U.S. Pat. No. 5,433,008 demonstrates a circular saw with a motor housing and a base plate. The base plate contains a recess, through which a circular saw-blade is inserted. The saw-blade is powered via a motor. Along with the saw-blade, the motor housing can be pivoted and secured in relation to the base plate via an angle setting device. For this purpose, the angle setting device consists of a clamping block with a curved slot as well as an elongated pivoting device. The clamping block is firmly attached to the base plate, and the pivoting device is firmly attached to the motor housing and the saw-blade. The pivoting device can be pivoted relative to the clamping block via a pivot point, such that the angle between the motor housing and the saw-blade can be adjusted. With the assistance of a rotating element that contains a shaft with a recess, the maximum pivoting range of the pivoting device can be increased or decreased.

The disadvantages of this angle setting device according to prior art are the complex construction design as well as the imprecise setting possibility of the maximum pivoting range (i.e., maximum miter angle) for the machine tool.

It is thus the task of the invention presented here to provide an improved angle setting device, through which the aforementioned problems can be overcome and which, in particular, demonstrates a less complex construction design.

A device is thus provided for the setting of the miter angle for application in a machine tool, in particular a circular saw, comprising a clamping block having at least one slot, and to a pivot lever, on which the machine tool can be mounted and which is supported such that the pivot lever can be pivoted around a pivot point relative to the clamping block between a minimum miter angle and a maximum miter angle.

According to the invention, the slot comprises at least two stop elements positioned so as to be offset relative to one another, as well as a setting mechanism having a lever element for the selection of a maximum miter angle, wherein the lever element comprises a mating stop element that can be aligned in such a way corresponding to the rotational alignment of the lever element that the mating stop element is able to strike the respective stop element in accordance with the selected maximum miter angle, by which means the pivoting movement of the pivot lever relative to the clamping block for setting the maximum miter angle can be limited. Through the combination of the lever element with the mating stop element in the setting mechanism, the maximum miter angle can be simply set in a space-saving manner.

According to a further advantageous exemplary embodiment of the invention presented here, it can be provided that the setting mechanism comprises an indicator and limiting element, which comprises an indicator scale as well as an elongated recess, wherein the indicator scale serves to indicate the selectable maximum miter angle, and the elongated recess serves to guide and limit the rotational motion of the mating stop element. The elongated recess can effectively hinder the mating stop element from accidentally being rotated too widely, i.e., outside of the range of the maximum miter angle to be selected.

The invention presented here will be further explained with regards to advantageous exemplary embodiments, with the assistance of the following illustrations.

DETAILED DESCRIPTION OF THE DRAWINGS

FIG. 1shows a machine tool1in the embodiment of a circular saw. The circular saw1comprises a device10for setting the miter angle of the circular saw1for the working support structure W.

As shown inFIG. 2, for the setting of the miter angle, the device10fundamentally comprises a base plate12, a clamping block14, a pivot lever30, and a setting mechanism50.

The base plate12of the device10is a component of the work surface2of the circular saw1(cf.FIG. 1).

The clamping block14is positioned at a right angle to the base plate12as well as to the work surface2of the circular saw1. The clamping block14is fundamentally designed as a sector-shaped plate15and comprises a first slot16and a second slot18. Both the first slot16and the second slot18are slightly curved. A scale19for indicating the miter angle is provided at the arc edge17of the plate15(cf.FIG. 1 through 5). As shown especially inFIG. 15, the first slot16features a first stop element20, a second stop element22, and a third stop element24.

As shown especially inFIGS. 3 and 11, the pivot lever30is fundamentally designed in the form of an elongated rod with a first end31aand a second end31b. Additionally, the pivot lever30comprises a first circular opening32, a first elongated recess33and a second elongated recess34, a second circular opening35, as well as a right-angle opening36. Further, the pivot lever30features a receiving device37for receiving the rest of the circular saw1.

At the first end31a, the pivot lever30is attached to the clamping block14through the first circular opening32in a rotating and pivoting manner. The pivot lever30can fundamentally be pivoted over the entire width of the clamping block14. A point38in the form of a finger is positioned at the second end31bof the pivot lever30. The point38serves to indicate the set miter angle on the indicator scale19of the clamping block14.

In the vicinity of the second end31b, a right-angle opening36is positioned, which is provided for receiving a clamping device40. The clamping device40is positioned in the second slot18of the clamping block14and serves to hold the pivoting lever30, and with it the rest of the circular saw1, in the selected miter angle in a releasable manner.

Between the first end31aand the second end31b, the first and second elongated recesses33,34as well as the second circular opening35are positioned. The first and second elongated recesses33,34as well as the second circular opening35are provided to receive the setting mechanism50. The setting mechanism50is positioned in the first slot16of the clamping block14(cf.FIGS. 2 through 5).

The setting mechanism50fundamentally comprises a lever element60as well as an indicator and limiting element70.

As shown inFIGS. 6 and 7, the lever element60in turn comprises a cylindrical base structure62with a central recess63. On the first surface62aof the cylindrical base structure62, a first protrusion64and a second protrusion65are mounted. Both of the protrusions64,65serve to engage the setting mechanism50and set it manually at a specified maximum miter angle. The first protrusion64features a sharply tapered form (arrow form), which is provided as an indicating method for the selected maximum miter angle.

A mating stop element66designed as a protrusion is positioned on the second surface62bof the cylindrical base structure62(cf.FIG. 7). The mating stop element66serves as a mating stop for each of the stop elements20,22,24of the first slot16in the clamping block14. Additionally, the second surface62bof the cylindrical base structure62features a cavity67that comprises two protrusions68,69. Both protrusions68,69consist of an elastic material that allows a specific bending of both protrusions68,69.

As shown inFIGS. 8 and 9, the indicator and limiting element70fundamentally consists of a disc-shaped base structure72. The base structure72comprises a first surface72aand a second surface72b. Additionally, the indicator and limiting element70comprises a curved recess71, which serves to receive the mating stop element66of the lever element60as well as guide it and limit its rotational motion relative to the indicator and limiting element70.

On the first surface72athere are three angle indicators as an indicator scale72c, namely 22.5°, 45°, and 50°, which can be selected as the maximum miter angle of the circular saw1. There is a bearing pin73on the first surface72a, which is provided to receive the lever element60. A latching surface74designed as a small protrusion is positioned at the base of the bearing pin73. The latching surface74consists of a rigid material and is designed such that it moves past the two protrusions68,69in the cavity67of the cylindrical base structure62of the lever element60with a specific effort and can be positioned between the two protrusions68,69when the lever element60and the indicator and limiting element70are in close contact with one another (cf.FIG. 10). The interplay of the latching surface74of the bearing pin73with the two protrusions68,69serves two purposes: first, to prevent a slight turning or accidental rotation of the lever element60relative to the indicator and limiting element70, in that the protrusions68,69offer a certain resistance; and second, to give the lever element60a certain stop and guide position for setting the selected maximum miter angle.

A right-angle protrusion75is positioned on the second surface72bof the base structure72of the indicator and limiting element70. The protrusion75features a first end and a second end. The first end attaches the protrusion75to the second surface72bof the base structure72. There are two nose elements76,77at the second end. Additionally, a blind bore78is contained in the right-angle protrusion75.

Both nose elements76,77serve to be inserted into the first and second elongated recesses33,34of the pivot lever30. The blind bore78serves to receive a bolt80, which is driven through the second circular opening35of the pivot lever30. With the assistance of the nose elements76,77in the elongated recesses33,34and the bolt80in the blind bore78, the indicator and limiting element70is attached along with the setting mechanism50to the pivot lever30.

In the fully assembled condition of the device for setting the miter angle, the clamping block14is vertically attached to the base plate12.

As shown inFIG. 3, the pivot lever30is joined to the clamping block14through the first circular opening32in a rotating and pivoting manner. The second circular opening35of the pivot lever30is positioned in line with the first slot16of the clamping block14(cf.FIG. 5). As described above, the setting mechanism50is attached to the pivot lever30at the second circular opening35. As shown inFIG. 11, for the purposes of mounting the setting mechanism50, the indicator and limiting element70is bolted to the pivot lever30. The two nose elements76,77are placed in the first and second elongated recesses33,34to guide the indicator and limiting element70. The indicator and limiting element70is joined to the pivot lever30and the clamping block14in a non-rotating manner.

The lever element60is placed on the bearing pin73in such a way that the mating stop element66is positioned above the pivot lever30and in the recess71as well as in the first slot16of the clamping block14. The lever element60is positioned such that it can be rotated towards the pivot lever30and the clamping block14. By turning the lever element60, a maximum miter angle is set, with the first protrusion64with the sharply tapered form at the appropriate marking of the scale (angle indicators 22.5°, 45°, and 50°) of the indicator and limiting element70, and the mating stop element66is aligned in the first slot16of the clamping block14in such a way that the mating stop element66strikes the stop element20,22, or24in correspondence with the selected maximum miter angle. As can be seen inFIG. 12, the value of 22.5° as the maximum miter angle has been selected using the lever element60. As shown inFIG. 13, the mating stop element66is correspondingly aligned in the first slot16in such a way that the mating stop element66strikes the first stop element20. The circular saw1is thus positioned in a miter angle of 22.5°.

As can be seen inFIG. 14, the value of 45° as the maximum miter angle has been selected using the lever element60. As shown inFIG. 15, the mating stop element66is correspondingly aligned in the first slot16in such a way that the mating stop element66strikes the second stop element22. The circular saw1is thus positioned in a miter angle of 45°.

As can be seen inFIG. 16, the value of 50° as the maximum miter angle has been selected using the lever element60. As shown inFIG. 17, the mating stop element66is correspondingly aligned in the first slot16in such a way that the mating stop element66strikes the third stop element24. The circular saw1is thus positioned in a miter angle of 50°.

It should be noted that inFIGS. 12 through 17, the pivot lever30is not shown and/or hidden.

After the maximum miter angle has been set, it is fixed using the clamping device40in such a way that the circular saw1is held in the selected miter angle and can be utilized in the corresponding manner.