DE29514141U1 - Stepless protractor - Google Patents

Description

II. Description

The invention describes a device for continuously setting angles ("continuously adjustable protractor") for example in construction or design drawings .

According to the current state of the art, angles are created in such a way that the angles are first marked out from a fixed point on a line using a rigid protractor and only then can this connection between the center and this marked point be drawn using a ruler. For this purpose, the well-known "GEO triangle" is used, for example. The disadvantage is that with only small legs and smaller drawings, the rigid

^S radius must be used for marking. This is very impractical in many cases.

Another well-known option for measuring angles are the well-known drawing machines, which, however, are not suitable for normal small drawings, for example in schools or teaching.

Other options are movable protractors, which, however, due to their design and concept, cannot be positioned at the zero point of the angle itself. In addition, the use for larger

2-S angle not possible.

The invention is based on the idea that an angle can be set directly by a device and immediately drawn or read off without the need for any additional steps.

This is now done by the invention described here in such a way that two ruler-shaped surfaces that initially lie on top of each other but are connected to each other are rotated around a common edge (=centre) point in such a way that an angle setting is always and continuously achieved. The size of this angle can then be read directly on a scale. Conversely, an angle can immediately be set on an existing drawing.

can be set and read.

The connection of the two surfaces is made in such a way that the actual connection points run in a circular path around the center. This means that

S the center is always fixed without the need for a mechanical connection at this point. This means that this point can actually be used as an idealized point, ie as a point in the "classical sense".
The commonly used assignment, which is also

AO depends on the displacement distance of the points, is designed in such a way that angles in a size range from 0 120 ° are continuously possible.

For practical reasons, the ruler corners themselves can have the same fixed angles, such as 30°, 00° or 90°. This protractor is also designed so that it can be used from both sides; therefore, firstly, all connection points are flat and secondly, all scale markings are opaquely underlined so that they can also be applied again on the back.

"* 6 —

IV. Figures

Figure 1 shows the basic form of the stepless protractor.

Figure 2 shows an example working position - here 47.5° or 132.5°.

Figure 3 shows a systematic section - in particular the representation of the edge bevel.

Figure 4 represents the systematic part of the connection of the surfaces.

Claims (1)

I. Claims to the invention Device or appliance for the stepless, direct application of angles starting from the vertex, preferably in construction or design drawings (C "stepless protractor"), characterized in that two ruler-shaped surfaces (1) (2) which are flexibly joined together and yet at the same time can be moved over one another in a circular manner are connected in such a way that two edges of these surfaces described above are always positioned over one another at a point (M) during this displacement, which is at the same time characteristically the zero point of scales on these edges and at the same time the vertex of the angle to be measured or applied, the legs of which in turn represent these two edges described above. Device or appliance according to claim 1, further characterized in that at least two, - for reasons of stability, preferably three - connection points (3) are present between the surfaces described in claim 1, which are designed in one of the surfaces as raised guide pins (4), which engage precisely in one or more circular guide rails (5) present in the other surface and thereby precisely and are guided in a precise manner. A further characteristic of this claim is that these guide rails are arranged in the shape of a circular segment exactly around the zero point (M) described in claim 1 in such a way that when both surfaces are displaced against each other, they are always positioned one above the other at the zero point. 3. Device or apparatus according to claim 1-2, characterized in that in the described displacement tO application of the surfaces, a fixed marking (6) applied to one surface is opposite a protractor (7) applied to the other surface, characteristically in such a way that the distance between the fixed marking just described *5 The angle indicated by the angle scale (o) and the angle scale now readable corresponds exactly to the angle of the mutual edges (Kl) (K2) of the surfaces (1), (2) described in claim 1, wherein the zero point also described in claim 1 2-0 (M) is also the vertex of this angle. It goes without saying that this always results in side angles, which can also be scaled on the angle scale (7) and thus read off directly. -5 4. Device or appliance according to claim 1-3, further characterized in that the connection described in claim 2 - for example for cleaning purposes - can be released in a defined manner and can also be adjusted by tightening the The self-locking screw (8) within, for example, cast-in threaded sleeves (9) can cause individual stiffness or ease in movement. Typically, in addition to spacer washers (10) "5(5 or spacer studs (not shown in the figures), saw screws with a corresponding tolerance are therefore provided, preferably - for example, a medium stiffness is provided at the factory. -2- 5. Device or appliance according to claims 1-4, further characterized in that the corner points of the surfaces (1) and (2) described in claim 1 are designed as fixed angles - preferably JjJ frequently used, such as 30°, 45°, 60° etc. Furthermore, the characterization of this claim consists in the fact that, in order to make the angle scale easier to read, one of the two surfaces is formed in the shape of a circular arc in one edge (K3), whereby the zero point (M) described in claim 1 is simultaneously the center of this circular radius. 6. Device or apparatus according to claims 1-5, further characterized in that the same displacement and in particular measuring process of angles as in 4S is shown in claims 1-5, is also possible after turning the device or the appliance onto its back. This is characterized by the underlaying of all angle, measurement and scale information in an opaque form (11) and the application of the same angle, measurement and scale information on the back. Another characteristic is the completely flat design of the surfaces, in particular their connection, on both sides, which is necessary for this process. 7. Device or appliance according to claim 1-6, characterized in that additional measuring scales, shapes or other scalings can be applied to the surfaces or on the edge or are recessed in another form. 8. Device or appliance according to claims 1-7, characterized in that the edges preferably used for drawing are beveled (so-called "ink edges") (12). Characteristically, the beveling of the edges lying one above the other is preferably provided by the shape shown in Figure 3 (i'3). 9. Device according to claim 1=7, further characterized in that the system described above can also be used multiple times on one device · can be created so that an iris-like shape is created by joining several surfaces together.