DE8520770U1 - Protractor for measuring and drawing angles - Google Patents

Description

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The innovation concerns a protractor for measuring and drawing of angles, with a solid part * the edge of which is one leg of the angle and with one against the fixed part in the angular plane pivotable part, the edge of which represents the other leg of the angle, and in which the set angle can be read on a scale.

A known device of the type mentioned consists of a protractor of the usual shape with an elongated rectangular base part and one attached to it, a Angle of 180 ° descriptive arc part with a Grädskälä, whereby a freely pivotable about the arc center point on the base part Leg is mounted, the one end of which is set between the base part and the pivot leg like a pointer on the degree scale Angle.

The disadvantage of the device described is that the characters or. The contact edges of the base part and the leg do not pass through the pivot point, i.e. arc center point, but in each case at a distance run from this * The angle between the base part and the leg corresponds to the angle read on the scale, but When the angle setting is changed, the point of intersection of the edges of the base part inevitably shifts and swivel arm. This increases the workload and increases the inaccuracy, especially when measuring and drawing multiple angles with a common intersection. In particular for visually impaired users of the device the necessary relocation of the entire arrangement in each case represents a considerable difficulty.

The object is therefore to create a protractor of the type mentioned at the outset which avoids the disadvantages listed and in particular a constant position of the point of intersection of the drawing or contact edges with any change in angle guaranteed, and which can also be easily used by the visually impaired.

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The solution to this problem has recently been achieved by one Protractor of the type mentioned, in which

- the fixed part is a semicircular plate,

- On the top of the plate a degree scale on both sides is arranged

- On the top of the plate at least one around the center of the circle there is a concentric circumferential sliding guide,

- The pivotable part is a semicircular plate arranged above the fixed plate, the center of which is marked with # 3 λ m Λ λ -w »■ P ** r» + "l * 5.Ä # - * Av * / 3« v »T31 of 4 "a / ^ ÄfilriivirTorrlönoV» ·? ο 4 ". nvirl

- The pivotable plate is a compatible counterpart to the sliding guide.

The protractor according to the innovation offers the significant advantage that by relocating the mounting of the pivotable part on the fixed Part from the center of the arc of the angle cut-jrunkt-bei any change in the angle setting maintains its position. This eliminates any repositioning of the protractor when measuring or drawing several angles with a common intersection.

Further advantages, especially the handling of the protractor The subclaims relate to explanations of the innovation which facilitate the visually impaired.

A dimensionally stable hard plastic is expediently used as the material for the protractor according to the innovation. For certain applications it is advantageous to use a transparent material.

A preferred embodiment of the innovation is shown below explained in more detail using a drawing. They show in detail:

Figure 1: a protractor according to the innovation in plan view, partly

in review and
FIG. 2: a partial section through the protractor along the line AA in FIG. 1.

As Figure 1 shows, the protractor according to the innovation consists of a fixed semicircular plate (1) and a

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pivotable, also semicircular second plate (2) arranged above the plate (1). The center points (3) of the two semicircular plates {1) and (2) are always congruent with one another, regardless of the position of the joint. This is achieved by a sliding guide (5) running around the lower plate (1), to which the pivotable plate (2) is a compatible counterpart. The lower, fixed plate (1) has a circumferential graduation scale on the edge, with which raised dot markings (6) and notches (7) embedded in the circumference (11) of the plate (1) correspond. In the area of its straight edge (22), the upper pivotable plate (2) has a length scale (8) with which raised point markings (9) correspond.

In the illustrated embodiment, the zero point of the length scale is in the center of the semicircle, but there are also other designs are conceivable. The top (2 ') of the pivotable plate (2) carries in the area of its circumference (21) in the exemplary embodiment no markings, but a degree scale or a corresponding scale with raised elements can also be used here Dot markings be applied * - For relief the handling of the protractor has the pivotable plate (2) on its upper side (2 ') parallel to the straight edge (22) in the Distance v * this on a raised grip strip (10).

FIG. 2 shows a partial section through the exemplary embodiment of the protractor according to the invention along the line AA in FIG Figure 1. On the top (1 ') of the fixed plate (1) is a cross-section approximately rectangular projection (51) arranged, together with a compatible recess (52) on the underside (2 ") of the ver pivotable upper plate (2) the sliding guide (5) forms. On the top (2 ') of the plate (2) are the raised point markings (9) of the length scale (8) to be recognized. The raised dot markings. (6) the degree scale (4 ·) are arranged on the upper side (1 ') of the lower fixed plate (1) in a shallow recess (41) in order to create a Exclude wear of the point markings (6). On the outside Edge (11) of the lower plate (1) one of the notches (7) can be seen.

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An angle is measured in such a way that initially the straight edge (12) of the fixed plate (1) is applied to one leg of the angle and that then the straight Edge (22) of the swiveling plate (2) is rotated as far as possible * until it rests on the wide leg of the angle to be measured * The set angle can now be read off the degree scale (4) or scanned using the raised point markings (6) will*

To draw a certain angle, the two flats (1) and (2) are first read on the Gradskaia (4) twisted against each other until the desired angle is set, after which by drawing the angle legs along the straight edges (12) and (22) the angles are completely drawn can be.

Claims (8)

Protection claims: 1. Protractor for measuring and drawing angles with a fixed part, the edge of which represents one leg of the angle and with a part which can be pivoted in relation to the fixed part in the angular plane, the edge of which represents the other leg of the angle; and in which the set angle can be read on a scale, characterized in that - that the fixed part is a semicircular plate (1), - that au:? the top of the plate (1) on the edge of the circle a degree vala [U) is arranged, - That on the top of the plate (1) at least one sliding guide (5) concentrically revolving around the center of the circle (3) is available, - That the versohwenkbaren part one over the fixed plate (1) arranged semicircular plate (2), the center point (3) of which is congruent with that of the fixed plate (1) is and - That the pivotable plate (2) has a compatible counterpart to the sliding guide (5). 2. Protractor according to claim 1, characterized by on the top of the fixed plate (1) arranged at the edge, raised point markings corresponding to the degree scale (4) (6). 3. Protractor according to claim 1 and 2, characterized by on the circumference (11) of the fixed plate (1) let in, with notches (7) corresponding to the graduation scale (A). 4. Protractor according to claims 1 to 3, characterized by a length scale (8) arranged on the top of the pivotable plate (2) along its straight edge (22). 5. Protractor according to claim 4, characterized by on the top of the pivotable plate (2) along its straight edge (22) arranged, with the length scale (8) corresponding raised point markings (9). I; / ft '. -ι. ^. rrr. ,. --- c if ■■ · * ■ · ···· ο e ·> - * - A2 - ' 6. Protractor according to claims 1 to 5 »characterized by one on top of the pivotable plate (2) parallel ν to your straight edge (22) arranged at a distance from this t raised handle bar (10). J 7. protractor according to claims 1 to 6, characterized in that that the sliding guide (5) is arranged on the upper side (1 ^v ) of the "fixed plate (1) and connected to the plate (i). i-bound or one-piece, describing a semi-circle, rectangle-shaped ^ cross-section projection (51) and one in the bottom (2 **) of the ver pivotable plate {? ..] Recessed, the projection form-locking receiving recess (52 (51) ) is formed. 8. Protractor according to claims 1 to 7 »characterized in that that the degree scale (4 ·) and the corresponding raised point markings (6) in a circumferential, flat Recess (.4-1) are arranged. 1 * till MH