DE8625444U1 - Vernier caliper - Google Patents

Description

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DiPL-INQ. HEINER LICHTI

DlPL-PHYS,DR.RER,NAT. JOST LEMPERT

D-7500 KARLSRUHE 41 (Grötzingen) DURLACHER STRASSE 31 TEL.: (0721)48511

Helmut Faustka Marxzeller Str.

D-7501 Marxzeil 4

Klaus D. Dunq Hülsendonkstr. 40

D-4156 Willich 1

2 Ci. &lgr;&rgr;&pgr;. '. 8253/86-Le

Vernier caliper

The invention relates to a caliper for measuring odd polygons, in particular tools with an odd number of working edges, the outer tips of which describe odd polygons, such as milling tools, drilling tools or the like, with a fixed and a movable measuring jaw.

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Conventional sliding gauges (DIN ß02) have a sliding bar that carries, for example, a scale in the metric or inch system. At one end of the sliding bar, a measuring scale extends at an angle to it with a measuring edge aligned perpendicular to the sliding bar. A slider can be moved on the sliding bar, which carries a vernier and also has a measuring jaw with a measuring edge aligned perpendicular to the direction of movement. These sliding gauges can be used in a variety of ways. However, they cannot be used to measure Ωμοβα. Furthermore, the dimensions of certain parts, workpieces, such as milling tools or the like, which have a contour defined by odd-shaped polygons, as is the case with a milling tool by the milling edges that define a polygon, can be measured. These types of milling tools have curved, receding flanks from the cutting edges, of which at least one always comes to rest on a measuring jaw if you want to take a measurement with a conventional caliper; However, since the receding flank is geometrically indeterminate, no correct measurement can be determined, for example, of the size of the milling tool, the diameter of the circle circumscribed by the cutting edges that defines the hole milled in a workpiece, or the like.

The invention therefore has the task of creating a caliper that can also be used on parts such as those described above and that allows reliable measurements to be taken on these parts without any major problems.

According to the invention, the above-mentioned problem is solved in a caliper of the type mentioned in that one of the measuring jaws has a triangular recess.

Basically, a caliper with a triangular

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Recess with any opening angle, tools or other parts with any number of polygonal edges can be measured; only a corresponding measuring display would have to be provided, which is generally not linear. In this case, a preferred further development provides for a digital display unit, whereby the digital display unit in particular has a cutting element.

According to another embodiment, the dimensions of the triangle recesses enclose an opening angle that corresponds to the opening angle between the sides of the polygons to be measured. In this case, the distance between the measuring jaws changes linearly when measuring a part whose angle corresponds to the opening angle of the triangular recess of one measuring jaw, so that a linear measuring display can be provided, either in the form of a scale or by means of a digital measuring display, which easily indicates the thickness of the part to be measured, for example its diameter, which is linearly related to the distance of a polygon point to the line connecting the two polygon points furthest from this; if a metric scale or a metric display is provided, the conversion is easily possible. In this case, the caliper can preferably always be used to measure workpieces with a specific polygonal contour, for example only triangles, only pentagons or the like, so that a set of several calipers with different opening angles of the rectangular recess is necessary and useful for measuring any polygon; however, a caliper whose opening angle of the recess is adapted to a specific polygon in the manner mentioned _could also have further scales or measuring displays that apply to other polygons, but are then not linear.

Further advantages and features of the invention will become apparent from

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the claims and from the following description in which an embodiment of the caliper according to the invention is explained in detail with reference to the drawing* The only figure shows:

an embodiment of the caliper according to the invention for measuring a milling tool with cutting edges lying on the corners of a quadrilateral triangle.

The slider I according to the invention has a slide bar 2 from which a fixed measuring jaw 3 extends at an angle. A slide 4 is slidably arranged on the slide bar 2 and carries a movable measuring jaw 6. The linear scale on the slide bar and the vernier of the slide are designed in the conventional manner in the exemplary embodiment shown; a digital display unit could also be provided in which the position of the slide Λ is digitally recorded via sensors and shown on a display. Instead of a centimeter scale or a display in centimeters, a scale or a corresponding display that converts the measuring position into the diameter of the part to be measured could also be provided, thus saving an additional calculation.

According to the invention, the caliper 1 has a triangular recess 8 in a measuring jaw 3, which is fixed here, which has an opening angle α between the two walls 9, 11 of the recess, which corresponds to the angle of the polygon defined by the cutting edges 12 of the part to be measured, such as a milling tool 7; in the embodiment shown, this polygon is a dashed regular triangle 13, which accordingly has an opening angle of 60o, so that the angle in the embodiment shown is also 60°. For a pentagon, the opening angle α would _be 10.8°, for a heptagon

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The measurement of such a part or tool 7 cannot be carried out with a conventional caliper, since the rear flanks 14 of each cutting edge 12 recede beyond the working circumference 16 determined by the cutting edges 12, also shown in dashed lines, but protrude beyond the connecting lines of the cutting edges 12, which determine the triangle 13 and are marked with a dashed line, so that two cutting edges cannot come into contact with one measuring pin of a conventional caliper at the same time, but a measuring jaw of a known caliper would always come into contact with a rear flank 14 of the cutting edges 12, which is not further defined. This is overcome by the inventive caliper, since due to the triangular design, two edges can always be in contact with the recess 8 on the walls 9, 11 of the measuring jaw 3 and a further edge can be in contact with the movable measuring jaw 6. The correct position of part 7 is achieved by slightly turning it until a maximum is indicated. The opening angle Q$£ does not necessarily have to correspond to the opening angle of the triangle to be measured; if this is not the case, the caliper would have to expand a non-linear, but rather variable scale.

Claims (6)

dr. ing! «ANS &iacgr;<10HTi '■■"■■' iir-ikir-r-i &igr;,&lgr;&igr;&igr;&tgr;&igr; D-7500 KARLSRUHE 41 (GRÖTZINGEN) NG. HEINER LICHTI ourlacherstrasse* DIPL.-PHYS.DR.RER.NAT. JOST LEMPERT TEL.: (0721) 4B511 Helmut Faustka Marxzeller Str. 41 D-7501 Marxzeil 4 Klaus D. Dunq Hülsendonkstr. 40 t ä Sep. 1986 0-4156 Willich 1 8253/86-Le S c h u t &zgr; a &eegr; s &rgr; r i'i c h e Vernier caliper for measuring odd polygons, in particular tools with an odd number of working edges, the outer tips of which describe odd polygons, such as milling tools, drilling tools or the like, with a fixed and a movable jaw, characterized in that one of the measuring jaws (3, 6) has a triangular recess (8). 2. Vernier caliper according to claim 1, characterized in that the walls (9, 11) of the triangular recess (R) enclose a five-angle ( θC ) which corresponds to the opening angle between the sides of the polygons to be measured. 3. Vernier caliper according to one of the preceding claims, characterized in that on a slide bar of the vernier caliper, several sequences of lines in the form of notches or color applications are provided parallel to one another, the lines having different sequences with different spacings. 4. Vernier caliper according to claim 3, characterized in that riaD the distances between lines change continuously. 5. Sliding gauge according to one of claims 1 to 4, characterized by a digital display unit. 6. Vernier caliper according to claim 5, characterized in that the digital display unit has a switching element. »ti If ill k III » tii ti «