FR2817892A1 - Hand saw jig for cutting butt joint miters in planks, comprises plank and saw guides which are simultaneously and symmetrically moved by a screw and slide system - Google Patents

Abstract

At the end of each plank guide (2,3) is a toothed gear with a common vertical axis for the three guides (1,2,3) and a third toothed gear with axis, perpendicular to the common axis, and meshing with the two other gears, which symmetrically and simultaneously move the two plank guides (2,3). A slide (7) slides longitudinally on the saw guide (1).. Jig for measuring and cutting butt joint miters. The fig has a saw guide (1) and two plank guides forming three concurrent planes on the same fixed imaginary axis with respect to three guides (1,2,3). The plank guides (2,3) can simultaneously and symmetrically turn around the axis with respect to the saw guide. The saw guide remains on the bisector plane of the two plank guides. Two equal length small connecting rods (9,10) are hinged on either side of the slide. The other end of each rod pivots on the plank guide. The slide movement drives the simultaneous displacement of the two plank guides. The slide is longitudinally driven by a screw fitted with a button (160) at its rear end.

Description

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 The present invention relates to a tool for making miter cuts.

 The tool differs from current tools allowing to realize the buttresses in miter of profiles, in that it allows to take the measurement of the angle and to carry out the cutting with the same tool and in that it eliminates the risk error. The classic miter boxes allow the realization of cutouts at 90, 45 sometimes 22, 5 'had 67, 5, thus allowing the tabbed abutments at 180, 90, 450 and 135. The other intermediate angles of abutments can be made with a miter saw. One of the difficulties consists in transferring the measurement of the abutment to be carried out, to the miter saw. In fact, you must divide the angle measured by two and write the additional or complementary angle on the miter saw. Mistakes are common, even among professionals, plinth installers for example.

 The invention avoids any error since it allows the profiles (typically the baseboards) to be placed on the tool in the actual position that they will occupy once they are butted.

It automatically guides the saw along the bisector of the angle to be obtained between the profiles to be butted. There is no calculation to do. For the plinth installer the tool also avoids repeated movements towards the miter saw, too bulky to be constantly moved.

 To make a connection, the device is placed at the angle (entering or leaving) of the two planes (of the two walls for example if it is to install plinths) on which the two boards must be butted. The board guides are placed on these plans. They therefore reproduce the amplitude of the angle joining the two planes. Once the tool is removed, the central part of the tool, the saw guide, is on the bisector of the two board guides. During cutting it guides the saw along this bisector while the two profiles intended to be butted are placed successively on each of the board guides.

 The tool according to a first characteristic comprises three parts articulated around the same axis at one of their

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 end. The two parts (the board guides), adjacent to the central part (the saw guide), move away or approach simultaneously and symmetrically from the latter, the latter therefore remaining on the bisector of the angle formed by the two adjacent parts.

 According to the particular embodiments, the two board guides move symmetrically thanks to: A gear, integrated at the end of each board guide, with an axis the vertical axis common to the three guides and a third gear, s' meshing on the previous two, with an axis perpendicular to the vertical axis common to the three guides.

A slide parallel to the main axis of the central part on which two equal length links are articulated on both sides. The other end of each link is fixed to the plate corresponding to its side. The movements of the slide therefore cause the two guides to move simultaneously and symmetrically. The slide can be driven by a longitudinal screw
The accompanying drawings illustrate the invention:
Figure 1 is a top view of the device of the invention.

 Figure 2 shows in 3 dimensions the cutting of a plinth using the invention.

 Figure 3 shows in 3 dimensions the underside of the embodiment using gears to obtain the simultaneous and symmetrical movement of the board guides.

 Figure 4 is a section of the device along the plane of passage of the saw, illustrating a possibility of assembling the components in the embodiment using gears.

 FIG. 5 illustrates the embodiment using a slide and rods to obtain the simultaneous and symmetrical movement of the board guides.

 With reference to these drawings, the device comprises a saw guide (1) and two board guides (2) (3) all hinging, at one of their ends, about a same axis.

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 Each of these three guides (1) (2) (3) is hollowed out between these two ends in order to allow the passage of the profiles to be cut in miter. When cutting the profiles rest on the one hand on one of the board guides (2) (3) and on the other hand on the saw guide (1). For this, the board guides (2) (3) have a square (21) (31) located at the same height as the central part of the saw guide (1) and on which the profiles rest during cutting.

In FIG. 4, the assembly of the three guides (1) (2) (3) is ensured, in the embodiment using gears, by a shaft (22) integral with the left board guide (2) on which, in starting from the bottom, the saw guide (1), the straight board guide (3) and again the saw guide (1) form hubs. A washer (140) and an elastic ring commonly called a circlip (150) block the three guides (1) (2) (3) in translation along the common axis. The screw (130) centers the longitudinal gear (6) and presses it when it is necessary to block the device once the angle measurement has been made. The longitudinal gear (6) then comes to bear on a projection (11) of the saw guide (1).

Figure 5 shows another embodiment. The threaded slide (7) is driven longitudinally by the threaded rod (8).

It drives the connecting rods (9) and (10) which themselves rotate the board guides (2) and (3) symmetrically and simultaneously. The rear end of the threaded rod is provided with a star button (160).

Claims (4)

 CLAIMS 1) Device for measuring and making the tabbed abutments of profiles characterized in that it comprises a guidescie (1) and two board guides (2) (3) materializing three planes competing on the same imaginary axis fixed with respect to three guides (1) (2) (3). The board guides (2) (3) can rotate simultaneously about this axis and symmetrically with respect to the saw guide (1). The saw guide (1) therefore remains on the bisector plane of the two board guides (2) (3).  2) Device according to claim 1 characterized in that it comprises at the end of each board guide (2) (3) a gear (4) (5) with an axis the vertical axis common to the three guides (1 ) (2) (3) and a third gear (6) with an axis perpendicular to the vertical axis common to the three guides (1) (2) (3) meshing with the previous two and involving a simultaneous and symmetrical movement two board guides (2) (3).  3) Device according to claim 1 characterized in that a slide (7) slides longitudinally on the saw guide (1). Two connecting rods (9) (10) of equal length are articulated on either side of the slide (7). The other end of each link (9) (10) pivots on the board guide (3) (2) corresponding to its side. The movements of the slide (7) therefore cause the simultaneous and symmetrical movement of the two board guides (2) (3).  4) Device according to claim 3 characterized in that the slide (7) is driven longitudinally by a screw (8) provided with a button (160) at its rear end.