ES2753420T3 - Miter cutting device - Google Patents

Abstract

Device for miter cuts with a central element (1), which has cutting guide elements (8, 9) that define a cut line (S) and two branches (2, 2 ') articulated to the central element , branches (2, 2 ') that act together with a mechanism (10, 11, 11', 20, 20 ', 21, 21') such that the cut line (S) runs on a bisector with respect to the pivot angle (a) of the branches (2, 2 ') that can be adjusted and locked, each branch (2, 2') presenting a fixing point (11, 11 ') for a locking lever (10), with which by fixing a distance of the two fixing points (11, 11 ') along a connection line (V) drawn through the fixing points (11, 11') it is possible to lock the angle pivot (a), characterized in that the locking lever (10) is shaped and articulated to the branches (2, 2 ') in such a way that with a pivoting of the branches (2, 2') on the pivot axis (28, 28 ') from a position stretched to a right angle position it remains within the plane of the branches (2, 2 ') and the central element (1), the connecting line (V) not running in any pivot position through a pivot axis ( 28, 28 ') of one of the branches (2, 2').

Description

DESCRIPTION

Miter cutting device

Field of technique

The invention relates to two devices for producing a miter cut, according to the preambles of claims 1 and 10. Such devices are known from document FR2817892A1.

State of the art

FR 2817892 describes a device for producing a miter cut. The device has a central element, which has two cutting guide elements spaced from each other. The cutting guide elements define a cutting line. The central element is connected with two branches, which can be brought into an angular position with respect to the central element. Through a differential mechanism, the cut line runs in a bisector with respect to the branches.

DE 3529855 A1 describes a false bracket with external false bracket flanks, which can be supported on the surfaces of a component to determine the angle with which the surfaces coincide. The branches each have a U-shaped channel, the channel walls forming supporting flanks on which a workpiece, for example a slat, can be supported to make a miter cut. Each branch has a fixing point on which in each case a locking lever with a first end acts. The second ends of the locking lever are connected with a slide that is movably located on a bar that runs along the bisector.

DE 10107766 A1 describes a cutting device for making miter cuts, in which a central element having a cutting guide element can rotate with respect to a single branch.

From DE 202007016558 U1 a false bracket is known which has two branches which are connected with a gear element and with a central element. The two gear elements form toothed segments that mesh with each other, so that the direction of extension of an aligner associated with the central element runs on the bisector between the two branches. The false bracket features internal and external false bracket flanks that can optionally be supported on component surfaces that coincide with an acute angle or component surfaces that coincide with an obtuse angle.

Summary of the invention

The invention is based on the aim of improving a generic type false bracket so that its use is more advantageous.

The objective is achieved by the invention indicated in the claims, the dependent claims representing not only advantageous refinements of the independent claims but also independent solutions for the objective.

Firstly and essentially by means of the invention, measures are taken with which the possibility of fixing the pivot angle of the branches is improved. For this purpose, a locking lever is proposed, shaped and fixed to the branches in such a way that with a pivoting of the branches on the pivot axis from a stretched position to a right angle position, it remains within the plane of the branches and the central element . It is a rigid joint lever that joins the two fixing points together. The two branches can preferably pivot from a stretched stop-stop position only to an acute-angle stop-stop position, particularly a right-angle position. With the dummy outboard flanks, obtuse angles can be measured in a component. With the internal false corner flanks, acute angles can be measured in a component. Preferably the two branches are associated with the central element in such a way that the edge of two surfaces of a component placed at an angle to each other can freely enter the area between the two flanks of false angle. A connecting line, which joins the two fixing points together, does not run in any pivot position through a pivot axis of one of the branches. Preferably the fixing points are arranged on a center line defined by the position of the pivot axes with a displacement with respect to the center in the direction of a false angle flank of the inner branches with respect to the pivot angle. Preferably the locking lever is a curved lever. It can have a short arm and a long arm. The two arms are at an angle to each other. In a way they also form an arc in a polygonal way. The short arm and the long arm form a free space between them. This free space may be surrounded by an arc-shaped segment of the locking lever. The short arm is fixed with a first fixing point. The long arm is attached with a second attachment point. The long arm has an oblong hole, the oblong hole extending in the direction of extension of the long arm. A clamping screw passes through the oblong hole, with which the position of the fixation point can be fixed on the long arm. As the cutting guide elements are only arranged in an area between the cutting lines of two straight lines drawn through the two external false square flanks and the intersection of Two lines drawn through the two internal false angle flanks ensure that both the internal and external false angle flanks can measure the angle of two component surfaces that coincide on a edge. Each branch has at least one supporting flank to support the workpiece. The at least one supporting flank runs parallel to the two false squad flanks. However, preferably the branch has a channel, in which the workpiece can be arranged, the two channel walls facing each other forming support flanks. The invention proposes a device for producing a miter cut, with which not only desired miter angles can be obtained in the cutting guide elements. With the device according to the invention, with the internal false flanks as well as the external ones, which point in the opposite direction to them, both acute and obtuse angles of two surfaces of a component that coincide on a edge can be measured. Acute angles can be measured with the internal false-flank sides. The obtuse angles can be measured with the external false square flanks. The false bracket flanks run in such a way that the intersections of lines, which run through the respective false bracket flanks, are essentially outside the plan of the device.

Brief description of the drawings

The invention will now be explained in more detail by means of an exemplary embodiment. They show:

Figure 1, in a perspective representation, a miter box,

figure 2 the view according to arrow II in figure 1;

figure 3 the rear view of the miter box,

figure 4 the side view of the miter box,

Figure 5 shows the plan view of the miter box,

figure 6, the section according to line VI-VI in figure 5,

Figure 7 shows the bottom view of the miter box in a stretched position limited by the stop of the two branches of the miter box,

figure 8, a representation according to figure 7 although with branches placed in an angular position, figure 9, the plan view of the miter box in the functional position according to figure 8,

FIG. 10 shows a representation according to FIG. 10 with pivot angles of the branches further reduced, FIG. 11 shows a representation according to FIG. 7 although in a right angle position limited by the stop of the two branches,

FIG. 12 is a first exploded view, and

Figure 13 shows a second exploded view of the elements of the miter box.

Description of the embodiments

The miter box shown in the drawings is a device for producing miter cuts and at the same time it can measure the angle of cut on two surfaces of a component that make an angle to each other.

The miter box has a central element 1 with an essentially circular base, which has two bearing holes 25 and at its edge in each case two pairs of openings 24. In the pairs of openings 24 are inserted pairs of pins 8 in each case, 9, which form cutting guide elements 8, 9. A slot is formed between the pins, through which a saw blade can be guided. The two grooves of the cutting guide elements 8, 9 define a cutting line S.

The device has two branches 2, 2 'essentially configured with mirror symmetry, each branch presenting an external false angle flank 3, 3' and an internal false angle flank 4, 4 ', opposite to it. The external false angle flanks 3, 3 'run parallel to the internal false angle flanks 4, 4'. The false bracket flanks 3, 3 ', 4, 4' are formed by the longitudinal shell edges of the branches 2, 2 '. Each branch 2, 2 'further forms a channel 7, 7' open upward. The channel 7, 7 'has two channel walls 5, 5', 6, 6 'running parallel to each other. The channel walls form supporting flanks 5, 5 ', 6, 6' to support a workpiece, which must be miter cut with a saw. The supporting flanks 5, 5 ', 6, 6' run parallel to the false square flanks 3, 3 ', 4, 4'. The channel walls further have side slits 23.

On the underside of the branches 2, 2 ’control mechanisms or elements 20, 20’ are attached. In the case of the control elements 20, 20 ’these are metal strips, which by means of four screws are fixed to the underside of the branches 2, 2’. The control elements 20, 20 'protrude freely from the branches 2, 2' and have bearing holes 22, 22 ', which form pivot shafts 28, 28' on which the branches 2, 2 'can pivot with respect to the center element 1. The bearing holes 22, 22 'are aligned with the bearing hole 25.

From above bearing journals 26, 26 ’protruding from the underside of the branches 2, 2’ are inserted into the bearing holes 25.

The two branches 2, 2 'can only pivot together because the control elements 20, 20' form spiral toothed segments 21, 21 ', which mesh with each other, so that with a pivoting of the branches 2, 2' the cut line S forms the bisector of the pivot angle a.

Stops 31, 31 'are provided, which in the stretched position (FIG. 7) abut with complementary stops of a prolongation 32 of the central element 1. However, for a stop limitation of the stretched position, other elements may also be provided. stop, for example an edge edge of the control element 20, 20 'can stop with a stop edge of the central element 1. The branches 2, 2' further form stops 33, 33 ', which can collide in the position in right angle (figure 11). Also in this case, it is alternatively provided that other stops limit the right-angle position, for example an edge edge of the control element 20, 20 ’, which abuts a supporting flank of the central element 1.

The two bearing holes 25 or the pivot shafts 28, which are defined by the bearing holes 25, define the position of a center line M, M ’, which runs in the branch extension direction 2, 2’. Between this central line M, M 'and the internal false angle flank 4, 4' directed towards the internal side of the pivot angle are a first fixing point 11 'of the first branch 2' and a second fixing point 11 of the second branch 2. The two fixing points 11, 11 'are connected to each other with a locking lever 10. In the case of the locking lever 10, it is a rigid lever, which has a curved extension path. It has a hook-shaped design. It has a short lever arm 13, which in a way forming a curvature or a polygonal arc becomes an oppositely curved long lever arm 14. The free end of the short lever arm 13 is rotatably fixed to the first branch 2 ', with the help of a fixing screw 17, which passes through a hole 16 of the locking lever 10. Through the oblong hole 12 passes a retaining screw 18, which is inserted into a through hole of the second branch 2, which opens into a recess 33 of a wall of the channel 7. In the recess 33 there is a drive handle 19 with an internal thread, in which the threaded segment of the clamping screw 18 is screwed in. With the actuating handle 19 a clamping force can be exerted, with which the head of the clamping screw 18 presses the edge of the oblong hole 12 against the underside of the branch 2, so that the effective length of the locking lever 10 can be adjusted. The effective length of the locking lever 10 is the distance of the fixing points 11, 11 'on the joint line drawn through the fixing points 11 , eleven'.

The fixing points 11, 11 'are arranged in such a way that with a pivoting of the branches 2, 2' from the stretched position (figure 7) to the right angle position (figure 11) on the pivot shafts 28, these The latter are further away from the connection line V. The connection line, with a pivot of the branches 2, 2 ', does not cross any of the pivot axes 28.

The locking lever 10 is shaped and joined with the branches 2, 2 'in such a way that in each pivot position it is located within the plane of the miter box. Preferably the miter box has no elements protruding from lines a, a ', b, b', drawn along the flanks of false bracket 3, 3 ', 4, 4' and intersecting at the line of cut S. The cut guide elements 8, 9 and preferably all the other elements of the central element 1 are located at each pivot position between the intersections of lines b, b 'and a, a'.

The locking lever 10 has an arc travel such that in the right angle position of the two branches 2, 2 ’it surrounds a foot 27, with which the branch 2’ can be placed on a base. The intersection of the two lines B, B 'is located at the right-angle position within a V-shaped or arc-shaped gap 15 between the short arm 13 and the long arm 14. The intersection is somewhat surrounded arc mode.

In the stretched position (figure 7) the two edges 31, 31 ’of the branches 2, 2’ have a distance 30 from each other, which increases as the pivot angle a decreases. The two opposite edges 33, 33 ’have a distance 29 from each other that decreases as the pivot angle a decreases.

The operation of the miter box is as follows:

After releasing the actuation handle 19, it is possible to freely pivot the two branches 2, 2 'on their pivot axis 28, so that the angle of two surfaces of a component that coincide on one edge can be measured, for example a wall of a room. For the measurement of an acute angle, the internal false angle flanks 4, 4 'are brought into plane contact. For the measurement of an obtuse angle, the external false angle flanks 3, 3 'are brought into plane contact. The actuation handle 19 is then tightened so that pivot angle a is set. One or more workpieces can now be miter cut, positioned in channel 7 and kept in flat contact with one of the support flanks 5, 5 ', 6, 6'. In this regard, the workpiece is located in the free space between the two cutting guide elements 8, 9, which are within the space delimited by lines a, a ', b, b'. Preferably the pivot range of branches 2, 2 'is limited to a range of 90 degrees to 180 degrees.

The above embodiments serve to explain the inventions covered as a whole by the application, which perfect the state of the art at least by the following combinations of characteristics in each case also independently, specifically:

A device, characterized in that the locking lever 10 is shaped and articulated to the branches 2, 2 'in such a way that with a pivoting of the branches 2, 2' on the pivot axis 28, 28 'from a stretched position to a right-angle position remains within the plane of the branches 2, 2 'and the central element 1, the connecting line V not running in any pivot position through a pivot axis 28, 28' of one of the branches 2, 2 '; a device, characterized in that the fixing points 11, 11 'are arranged with respect to a center line M, M' defined by the position of the pivot axis 28, 28 'with a displacement with respect to the center in the direction of a false angle flank 4, 4 'of the inner branches 2, 2' with respect to the pivot angle a;

a device, characterized in that the locking lever 10 has a short arm 13 that is articulated to the attachment point 11 'of the first branch 2' and a long arm 14, which with an oblong hole 12 is attached to the attachment point 11 of the second branch 2, the arms 13, 14 forming a free space 15 between them;

a device, characterized by a clamping element 18 that acts on the long arm 14;

a device, characterized in that the two arms 13, 14 surround the free space 15 as an arc, in particular such that in the right angle position of the two branches 2, 2 'a foot 27 of the first branch 2 'is located in the free space 15;

a device, characterized in that the two branches 2, 2 ’are articulated to the central element 1 using control elements 20, presenting the two toothed control elements 20 21,21’ that mesh with each other;

a device, characterized in that each branch 2, 2 'with its two longitudinal sides running parallel to each other have internal false angle flanks 4, 4' or external false angle flanks 3, 3 'and at least one supporting flank 5 , 5 ', 6, 6' parallel to them for the support of a workpiece that crosses the cut line S; a device, characterized in that the cutting guide elements 8, 9 are only arranged in an area between the intersection of two straight lines a, a 'drawn through the two external false angle flanks 3, 3' and the intersection of two lines b, b 'drawn through the two internal false angle flanks 4, 4', so that both with the internal false angle flanks 4, 4 'and with the external false angle flanks 3, 3' can measure the angle of two surfaces of a component that coincide in a edge;

a device, characterized in that each branch 2, 2 'has a channel 7, which on both sides is delimited by support flanks 5, 5', 6, 6 ', with support flanks 5, 5', 6, 6 slits 23;

a device, characterized in that the saw guiding elements 8, 9 are only arranged in an area between the intersection of two straight lines a, a 'drawn through the two external false angle flanks 3, 3' and the intersection of two lines b, b 'drawn through the two internal false angle flanks 4, 4', so that both with the internal false angle flanks 4, 4 'and with the external false angle flanks 3, 3' can measure the angle of two surfaces of a component that coincide on a edge.

All the disclosed features are essential to the invention (in themselves, but also in combination with each other). Thus, the disclosure of the application also includes the disclosure content of the related / attached priority documents (copy of the prior application) in all their content, also for the purpose of including the characteristics of these documents in the claims of the present application. The dependent claims characterize the state of the art with independent features of the invention, in particular to make partial applications based on these claims.

List of reference symbols

1 central element

2, 2 ’branch

3, 3 ’flank of false external squad

4, 4 ’flank of false internal squad

5, 5 'support flank

6, 6 'support flank

7, 7 'channel

8 cutting guide element 9 cutting guide element 10 locking lever

11 fixing point

11 'fixing point

12 oblong hole

13 short arm

14 long arm

15 free space V / U 16 hole

17 screw

18 clamping element

19 actuation handle 20 control element

20 'control element

21 toothed

22 bearing bore

23 slit

24 opening

25 bearing hole

26 bearing journal

27 foot

28 pivot shaft

29 distance

30 distance

31 song

32 extension

33 rebate

a, a 'lines

b, b 'lines

S cut line

at pivot angle

Claims (10)

1. Device for making miter cuts with a central element (1), which has cutting guide elements (8, 9) that define a cutting line (S) and two branches (2, 2 ') articulated to the central element, branches (2, 2 ') that act together with a mechanism (10, 11, 11', 20, 20 ', 21, 21') in such a way that the cut line (S) runs on a bisector with with respect to the pivot angle (a) of the branches (2, 2 ') that can be adjusted and locked, each branch (2, 2') presenting a fixing point (11, 11 ') for a locking lever (10) , with which by fixing a distance from the two fixing points (11, 11 ') along a connection line (V) drawn through the fixing points (11, 11') it is possible to block the pivot angle (a), characterized in that the locking lever (10) is shaped and articulated to the branches (2, 2 ') in such a way that with a pivoting of the branches (2, 2') on the axis pivot (28 , 28 ') from a stretched position to a right-angle position remains within the plane of the branches (2, 2') and the central element (1), the joint line (V) not running in any pivot position to through a pivot axis (28, 28 ') of one of the branches (2, 2'). 2. Device according to claim 1, characterized in that the fixing points (11, 11 ') are arranged with respect to a center line (M, M') defined by the position of the pivot axis (28, 28 ') with a displacement with respect to the center in the direction of a false square flank (4, 4 ') of the inner branches (2, 2') with respect to the pivot angle (a). Device according to one of the preceding claims, characterized in that the locking lever (10) has a short arm (13) that is articulated to the fixing point (11 ') of the first branch (2') and a long arm (14), which with an oblong hole (12) is fixed to the fixing point (11) of the second branch (2), the arms (13, 14) forming a free space (15) between them. Device according to claim 3, characterized by a clamping element (18) acting on the long arm (14). Device according to one of claims 3 or 4, characterized in that the two arms (13,14) surround the free space (15) as an arc, in particular such that in the right-angle position of the two branches (2, 2 ') a foot (27) of the first branch (2') is located in the free space (15). Device according to one of the preceding claims, characterized in that the two branches (2, 2 ') are articulated to the central element (1) using control elements (20), the two control elements (20) having serrations (21 , 21 ') that mesh with each other. Device according to one of the preceding claims, characterized in that each branch (2, 2 ') with its two longitudinal sides running parallel to each other have internal false angle flanks (4, 4') or external false angle flanks ( 3, 3 ') and at least one supporting flank (5, 5', 6, 6 ') parallel thereto for the support of a workpiece that crosses the line of cut (S). Device according to one of the preceding claims, characterized in that the cutting guide elements (8, 9) are only arranged in a zone between the intersection of two lines (a, a ') drawn through the two flanks of external false bracket (3, 3 ') and the intersection of two lines (b, b') drawn through the two internal false bracket flanks (4, 4 '), so that both with the internal false bracket flanks (4, 4 ') As with the external false bracket flanks (3, 3') the angle of two surfaces of a component that coincide on a edge can be measured. Device according to one of the preceding claims, characterized in that each branch (2, 2 ') has a channel (7), which is delimited on both sides by supporting flanks (5, 5', 6, 6 '), presenting the support flanks (5, 5 ', 6, 6') slits (23). 10. Device for producing miter cuts with a central element (1) that has cutting guide elements (8, 9) that define a cutting line (S) and two branches (2, 2 ') articulated to the central element, the branches (2, 2 ') acting together with a mechanism (10, 11, 11', 20, 20 ', 21, 21') in such a way that the line of cut (S) runs in a bisector with respect to the angle pivot (a) of the branches (2, 2 ') that can be adjusted and locked, presenting each branch (2, 2') with its two longitudinal sides running parallel to each other internal false flank flanks (4, 4 ') or external false bracket flanks (3, 3 ') and at least one supporting flank (5, 5', 6, 6 ') parallel to them for the support of a workpiece that crosses the line of cut (S ), characterized in that the saw guiding elements (8, 9) are only arranged in an area between the intersection of two lines (a, a ') drawn through the two false flanks External squad (3, 3 ') and the intersection of two lines (b, b') drawn through the two internal false squad flanks (4, 4 '), so that both with the internal false squad flanks ( 4, 4 ') As with the external false bracket flanks (3, 3') the angle of two surfaces of a component that coincide on a edge can be measured.