ASSEMBLY FOR DRAWING LINES IN A GIVEN DIRECTION

Abstract: An assembly for drawing lines in a desired direction, the said assembly comprising a drafting board and a ruler. The ruler employed is a rolling ruler (3). The board (1) is provided with guiding stops (2), against which stops the rolling ruler is to be conducted. The stop (2) is so low, that the ruler member of the rolling ruler (3) can partly move on top of it while the roller member still stays in touch with the drafting board (1). On the other hand, the stop (2) is yet so high, that it allows for the directing of the rolling ruler (3) by pushing the ruler member against the stop (2), till it obtains the direction of the stop (3a3b3c) and the ruler (3) can be moved, maintaining its direction, to the desired spot (3d) on the drafting board (1). The amount of the stops can be two or more, so that they represent the directions most frequently needed in the drawing. They can be suspended and arranged to be pressed against the board (1) under the rolling ruler. As stops (2) can also be used two or more pins (4) located on the straight line having the desired direction. The directions determined by pins located on adjacent or opposite sides can as well be used.

Description: ASSEMBLY FOR DRAWING LINES IN A GIVEN DIRECTION The object of the present invention is an assembly for drawing, lines in a given direction, the said assembly comprising a drafting board and a ruler. There exists a generally known method for drawing lines in a given direction by placing the ruler in repetition in the direction of eith-er the horizontal or the vertical axis,- by visual estimation and with the help of auxiliary lines or given points only. This method of operation is slow and troublesome. In- the prior art is known a drafting board introduced in the German Patent Publication no. DE 2 109 490, to the sides of which board are attached fillets or equivalent in order to fix the paper onto fhe board. The fillet can, according to the description, be used for exaizple as a support for a set square, which makes it possible to draw vertical and horizontal lines. This method of employing a drawing ruler is generally known, as well as the fact that the said technique requires continuous pressing of the ruler against the board and the guiding fillet. This i in practice very arduous and makes the working process slow The purpose of the present invention is to eliminate the above described drawbacks and to facilitate the placing of the ruler in different directions, partilularly when a so-colled rolling ruler is used. This is achieved by the characteristic features of the invention pointed out in the Patent Claim 1. A rolling ruler is a drafting device with a normally rec¬ tangular ruler, whereto is geared an axis parallel to the drawing edge, the axis having two rollers of the same size fixedly mounted at its both ends and slightly proturbing OMPI from under the ruler plate. Guided by the said roller axis, the ruler can be moved on the drafting board without deviating from the original direction, and during the dra¬ wing phase the ruler can be locked in its place by pres¬ sing the drawing edge against the paper. Consequently it is a suitable device for facilitating the drawing of pa¬ rallel lines, particularly in mechanical drawing. By means of the present invention it is possible to combine prac¬ ticality to the accurate but arduous directing method of the ruler presented in the German publication. One of the advantages of the device according to the pre¬ sent invention is that both vertical and horizontal direc¬ tions as well as other necessary and suitable directions ' are obtained easily, securely, accurately and successively by pushing the rolling ruler against a guiding stop or bar, and then returning it to the drawing position. This kind of assembly is very-practical in drawing illustrations " of all sizes, both in preliminary drafting and the final dra¬ wing phase. It can partly replace other, heavier and clum¬ sier drawing devices. In the following the invention is explained in detail with reference to the appended drawings, wherein Figure 1 is an illustration of the assembly and its functio seen from above, and Figure 2 is an elevation view of the assembly along the line A-A of Figure 1. To the drafting board 1 is attached the ruler-like stop 2 in a desired direction, against which stop the rolling ru¬ ler 3 is pushed so that even when it approaches the stop in declined position, it turns to touch the edge of the stop along the full length of the ruler. Thus the ruler obtains the correct direction, and is further transported in this direction to the ' desired spot in the drawing. In Figure 1 the movements of the rolling ruler 3 are illustra- ted by the series of pictures 3a -→ 3b → 3c - ■ > 3d. In most cases two perpendicular directions are needed. The perpendicular sides of the rectangular drafting board are therefore provided with stop fillets, wherefrom the horizontal and vertical X- and Y-directions can be obtai¬ ned. By providing all sides with stops it is possible to obtain the X- and Y-directions both by pushing and by pulling the ruler against either of the opposite sides. By making the stops sufficiently low, the rolling ruler can be used for drawing, even if its draw r ing edge should partly cross the stop. The same advantage is achieved if a suspended stop is pressed onto the drafting board plane owing to the pressure of the rolling ruler. The guiding stops of any of the sides can at the same time function as clips keeping the paper in its place. The guiding stops can be attached to the drafting board in such directions as are frequently needed in each dra¬ wing in question, for example in the X-, Y- and Z-directions used in axonometric illustrations. The stop does not necessarily have to be like a straight ruler, but it can consist of two or more pin-like stops 4, located on a straight line having the desired direction. The pins can be placed so that when the rolling ruler touches two given pins in direciton 5, a given angle o is obtained with respect to the basic directions. The described fashion of using the rolling ruler is impro¬ ved by providing the rolling ruler itself with a knob or equivalent handle 6, placed in the ciddle of the ruler. By employing the handle it is easy to turn the rolling ruler approximately to the desired direction, and after reaching the stop the ruler can easily be guided to the 0>.ffl stop-direction by holding it in the middle. It is an essential characteristic of the invention, that in order to draw lines in a given direction by using the rolling-ruler, the said direction is obtained from the stop, against which stop the rolling ruler is pushed, whe¬ reafter the said direction is brought to the spot of draf¬ ting by means of the ruler, which moves independently without deviating from the obtained direction. The draf¬ ting device itself will not, during the drawing process, be in any further connection with the stop, fillet or bar that gave the direction, as is the case when employing a bracket ruler and a set square or in systems where the ruler, in order to maintain its direction, is supported against a rail attached to the drafting board during the whole shifting and drawing operation. OMPI "

Claims: PATENT CLAIMS 1. An assembly for drawing lines in a given direction, comprising a drafting board and a ruler, c h r a c ¬ t e r i z e d in that the ruler is a rolling ruler (3) and that the board (1) is provided with guiding stops (2), against which stops the ruler is to be directed. 2. The assembly of claim 1, c h a r a c t e r i z e d in that the guiding stop (2) is so low*, that the ruler member of the rolling ruler can partly move on top of it, while the roller member still stays in touch with the drafting board, and that the stop (2) is yet so high, that it allows for the" directing of the rolling ruler by pushing its ruler member against the stop (2) until it obtains the direction of the stop. 3. The assembly of claim 1 or 2, c h a r a c t e r i z e in that the drafting board (1) is provided with two or mo¬ re stops (2) representing the most frequently needed di¬ rections. 4. The assembly of any of the previous claims 1-3, c h a¬ r a c t e r i z e d in that the stop (2) is suspended and arranged to be pressed onto the board plane, under the rolling ruler. 5. The assembly of any of the previous claims 1-4, c h r a c t e r i z e d in that as the guiding stops are used two or more pins (4) located on the straight line having the desired direction. 6. The assembly of claim 5, c h a r a c t e r i z e d in that on the sides of the drafting board (1) are placed pins (4) so that the direction determined by two pins on adjacent sides forms a given angle together with the di¬ rection determined by two pins on the same sice. _OMPI

Inventors: HIETALA VEIJO
Applicants: HIETALA VEIJO
Application year: 1981
Main classification: B43L5
IPC codes: B43L5, B43L7