FR2666758A1 - STOP RULE FOR PORTABLE CIRCULAR SAWS. - Google Patents

Abstract

The invention relates to a stop rule for portable circular saws, the sawing tool (4) of which can be rotated about an axis (7-7) parallel to the direction of advance of the saw (3). The stop rule (8) comprises a support plate (9) which is provided with a plate (15) bearing an angular graduation and being able to pivot about an axis parallel to the axis (7-7); it is also possible, when performing a rafter cut in a wooden beam (1), to position the stop rule (8) on part 1 so as to perform the cut without having to determine beforehand by calculation and to draw the cut line.

Description

-1- The present invention relates to a stop rule for saws

  portable circular saws, the sawing tool of which is mounted on a base plate of the portable circular saw by being able to pivot about an axis parallel to the direction of advance of the circular saw, the stop rule comprising a plate support

  on which a support element is pivotally mounted

  aunt. For sawing wooden beams with a portable circular saw, it is known to use for guiding the saw a stop rule whose support plate is provided with a pivoting support element It is thus possible to '' perform oblique sawing

in wooden beams.

  During assemblies to be made as a frame, such as for example for the production of roof rafters, it is necessary to saw the wooden beam not only obliquely to the bearing surface but also obliquely to the surface perpendicular to it This is a double bevel (chevron cut), in which case the blade

  saw, initially perpendicular to the surface of the ap-

  then is rotated by a determined angle.

  Consequently, the line of action of the saw blade moves naturally in the workpiece, which means that, next to the desired cutting line, a second offset cutting line must be defined by hand.

  which must be calculated according to the angular position

desired area of the saw blade.

  This process is complicated and time consuming and can

lead to inaccuracies.

  The present invention therefore aims to achieve a stop rule of the type defined above, with the help of which double oblique cuts can

  be obtained in an easy and precise manner.

-2-

  This problem is solved in accordance with the invention.

  tion in that there is provided on the support plate a

  graduation label which includes an an-

  gular near the support plate.

  With the stop rule according to the invention, it is no longer necessary to initially carry out the calculation and the drawing of the new cutting line, but on the contrary it suffices to move the stop rule on the wooden beam until the indicated cutting line

  coincides with the desired angular value on the gradua-

angular tion.

  After fixing the stop rule, it is

  then possible to slide the circular saw

  along this rule to double

  oblique cut at the desired location.

  Other characteristics and advantages of the invention will be highlighted in the following of the

  description, given by way of example, which will be made

  in relation to the attached drawings in which Fig 1 is a plan view of the stop rule according to the invention, Fig 2 is a sectional view taken along

II-II in Fig 1.

  As shown in Fig 1 and 2, in part 1, which is a wooden beam, a cut by sawing must be made along cutting line 2 and with a double bevel (chevron cut) As a portable circular saw 3, we use in the example of

  realization considered a circular saw of form an-

  nular but it is however also possible to use

  read a full blade The sawing tool 4, that is to say the sawing ring or the full blade, can be rotated, with the drive motor 5, relative to a base plate 6 of the circular saw 3, about an axis 7-7 parallel to the direction of advance of the circular saw 3, -3-

  to make oblique cuts.

  For guiding the circular saw 3, a stop rule 8 is provided, the support plate 9 can be applied against a support surface 10 of the part 1. The support plate 9 is connected to an element

  support 11, able to pivot about an axis 12 perpen-

  dicular to the bearing surface 10, and a first gra-

  angular duation 13 indicates the angle between the plate

  support 9 and support element 11.

  On its upper side, the support plate 9 is provided with a support rod 14 on which is mounted a graduation plate 15 so as to be able to pivot and move in translation. This plate 15 is provided, in its zone close to the bearing surface 10, of a second angular graduation 16, which indicates the angles between 0 and 600 in the form, converted

  by calculation, of a linear nomogram.

  To make the saw cut with double bevel, initially the support element 11 is applied against the support surface 17 perpendicular to the support surface 10 of the workpiece and the support plate 9, s' pressing against the support surface 10, is pivotally moved relative to the support element 11 as far as the desired angular position and it is fixed to

using a clamping screw 18.

  The graduation plate 15, located in the rest position below the support plate 9, is now folded outwards on the support surface 10 and then the stop rule 8 is moved along the surface support 17 until the cutting line 2 coincides, on the second angular scale, with the value of the angle where the sawing tool 4 has been

  brought by pivoting around the axis 7-7.

  After blocking the stop rule 8 by means of a threaded clamp 19 on the part 1 and after returning the graduated plate 15 to its rest position, the circular saw 3 can now be guided along the support plate 2 of the stop rule 8 for making the cut The sawing tool 4 then follows

exactly the cutting line 2.

  The possibility of translation of the graduated plate 15 along the support rod 14 then proves to be judicious when it is necessary to adjust, between the support plate 9 and the support element 11, very acute angles

or very obtuse.

-5-

Claims (1)

CLAIMS 1 Stop rule for portable circular saws whose sawing tool is mounted on a base plate of the portable circular saw by being able to pivot about an axis parallel to the direction of movement of the circular saw, the stop comprising a support plate on which a support element is pivotally mounted, characterized in that there is provided on the support plate (9) a graduated plate (15) which has an angular graduation ( 16) near the support plate (9). 2 stop rule according to claim 1, characterized in that the graduation plate (15) is mounted on the support plate (9) so as to be able to pivot about an axis (7-7) parallel to the direction in advance of the circular saw. 3 Stop rule according to one of claims   1 or 2, characterized in that the graduated plate   (15) is mounted so that it can move in trans-   lation along the support plate (9).