WO2010045920A1

WO2010045920A1 - Compass

Info

Publication number: WO2010045920A1
Application number: PCT/DE2009/001423
Authority: WO
Inventors: Oliver Seelig
Original assignee: Draw.Tec Gmbh & Co. Kg
Priority date: 2008-10-22
Filing date: 2009-10-13
Publication date: 2010-04-29
Also published as: CN102196921A; DE102008052648B3; CN102196921B; EP2337691A1; EP2337691B1

Abstract

The invention relates to a compass, having a compass head and two compass legs which are arranged thereon and connected to each other in an articulating manner, further having a locking apparatus which comprises a movable slide (6, 20, 22, 30), which can be displaced between a first position in which a movement of the compass legs (3, 4, 27, 35) is possible and a second position in which the compass legs (3, 4, 27, 35) are blocked, and wherein the slide (6, 20, 22, 30) is arranged on one of the compass legs (4, 27, 35) and can be displaced along a guide.

Description

compasses

The invention relates to a compass, with a compass head and two pivotally interconnected compass legs and a locking device, wherein the locking device comprises a movable slide, which is possible between a first position in which a movement of the compass legs and a second position in the the compass legs are blocked, is displaceable.

Such circles have no Mittelradspindel for adjusting the compass. Instead, the joint in the compass head is usually formed by one or two head screws, wherein the compass is constructed so that the movement of the two compass legs takes place synchronously. In DE 27 33 978 A1 a compass with a single cap screw is described. In circles with two capscrews the compass legs are usually connected to each other via intermeshing teeth, for example as shown in DE 7244964 U. There, the compass legs are provided in the region of the compass head with a circular segment-shaped toothing. Since no intermediate wheel spindle is provided for adjustment in such circles, the required clamping force, which prevents unwanted adjustment of the compass legs and keeps the compass legs in position during the drawing, can only act between the compass head and compass legs. This clamping force is given in conventional circuits during production and can not be readjusted at a later date or very difficult. However, if this clamping force is overcome during the drawing, the radius of the compass is undesirably adjusted. This problem occurs in particular when an extension rod is attached to one leg, since the acting torque is greatly increased by the longer lever of the extension rod.

To counteract this disadvantage, it has already been proposed to provide an adjustment mechanism in the compass head. In DE 2 246 321 A a compass is described with a device for fine adjustment of the compass legs, the a spring for applying a biasing force to a gear pinion. Similarly, a circle is disclosed in DE 38 36 682 C1, which has a locking device, which is for example designed as a clamping pliers and acts on a gear or a pinion to lock this releasably. DE 33 19 73 A relates to a compass, wherein in the region of the circular head a round wedge is provided, which is guided in a wedge-shaped groove and can be clamped by pressing a screw against the compass legs. However, these known circles with an adjustment mechanism in the compass head have the disadvantage that they are complicated in structure and expensive to manufacture.

The invention is therefore based on the object to provide a compass without intermediate wheel, which allows a lock and simpler structure and thus less expensive to produce.

To solve this problem the invention is provided in a compass of the type mentioned that the slide is arranged on one of the compass legs and is displaceable along a guide.

Such a slide is simpler in comparison to the complex constructions known from the prior art and can be produced inexpensively. The compass according to the invention can also be used for drawing larger radii without the radius being adjusted. Likewise, an extension rod can be mounted.

In the compass according to the invention, it is provided that the slider is arranged on a compass leg and is displaceable along a guide. By moving the slider along the guide, the compass can be easily brought from the locked position to the unlocked position where a change in radius is possible.

According to one embodiment of the invention, it may be provided that the guide has a groove or a recess in which a corresponding is arranged displaceably opposite projection formed, wherein the projection is arranged either on the slider or on a compass leg. The guide can run substantially parallel to the compass legs or obliquely thereto or along a circular path. By the guide comprising a groove or recess and a guided therein displaceable projection, a change between the locked position and the unlocked position can be made particularly easily.

According to a variant of the compass according to the invention, it can be provided that the slider at least partially surrounds a compass leg. In this case, the slider may have a substantially U-shaped cross section, the lateral portions are guided on opposite surfaces of the compass leg. In such a trained slide, the direction of movement results through the compass legs, on which the slider is guided on the outside.

In the context of the invention, it may be provided that the locking device has a first locking element arranged on the slide, which interacts with a second locking element arranged on the compass arm and / or on the compass head in order to produce positive locking. In particular, the first or second locking element may have a recess into which a correspondingly formed projection of the other locking element can be inserted. Thus, the compass according to the invention can be locked at different opening angles and thus different radii, it can be provided that the first or second locking element has a plurality of recesses.

A development of the invention provides that the slide of the compass according to the invention has an eyelet formed as a slot, by means of which it is held on the compass head. This eyelet serves as a captive for the slide. The compass of the invention may have a toothing, by means of which both compass legs are coupled together. The toothing causes a synchronous movement of both compass legs.

There are also embodiments of the compass according to the invention are possible in which each compass leg is associated with a slider.

A variant of the compass according to the invention provides that the locking device has a first locking element arranged on the slide, which interacts with a second locking element arranged on the compass arm and / or on the compass head in order to produce a traction. Preferably, the first or second locking member has a wedge surface which is clamped against a mating surface of the other locking member to generate the frictional connection.

According to a further alternative variant of the invention, it may be provided that the locking element having the wedge surface is guided on an adjusting spindle and is displaceable by turning the adjusting spindle. The adjusting spindle can be arranged in a recess of the compass leg. It is also conceivable that two wedge surfaces are guided on the adjusting spindle, which can be applied to opposite surfaces of the compass leg.

A further alternative embodiment of the invention provides that the locking device has a first locking element arranged on the slide, which is movable by means of an adjusting spindle and has a surface, wherein the first locking element interacts with a second locking element arranged on the compass leg.

Further advantages and details of the invention will be explained with reference to embodiments with reference to the figures. The figures are schematic representations and show: 1A is a perspective view of a compass according to the invention in the unlocked position;

Fig. 1B is a front view of the circle of Fig. 1A;

Figure 1C is a section through the compass shown in Figure 1 B along the line N.

Fig. 1 D is an enlarged view of the compass head;

Fig. 2A is a perspective view of the circle in the locked state;

Fig. 2B is a front view of the circle of Fig. 2A;

Fig. 2C is a section taken along the line M-II of Fig. 2B;

FIG. 2D is an enlarged view of a portion of the compass shown in FIG. 2C in the area of the compass head; FIG.

Fig. 3A perspective views of the compass head; and 3B

Fig. 3C is a partially sectioned front view of the compass head of Fig. 3A;

Fig. 3D is a partially sectioned side view of the compass head of Fig. 3A;

Fig. 3E is a sectional view of the compass head of Fig. 3D taken along the line MI-III;

3F is an enlarged view of a portion of the compass head of FIG.

3A; Fig. 4A is a perspective view of a compass leg;

Fig. 4B is a front view of the compass leg of Fig. 4A;

FIG. 4C is an enlarged view of a portion of the compass leg of FIG. 4A; FIG.

Fig. 5A is a perspective view of a slider;

Fig. 5B is a front view of the slider shown in Fig. 5A;

Fig. 5C is a side view of the slider shown in Fig. 5A;

Fig. 5D is a rear view of the slider shown in Fig. 5A;

Fig. 5E is another perspective view of the slider of Fig. 5A;

Fig. 5F is another perspective view of the slider of Fig. 5A;

FIG. 5G is an enlarged section of the slider shown in FIG. 5A; FIG.

Fig. 5H is an enlarged section of the slider shown in Fig. 5C;

6A is a perspective view of a slider according to another embodiment;

Fig. 6B is another perspective view of the slider shown in Fig. 6A;

Fig. 6C is another perspective view of the slider shown in Fig. 6A; Fig. 6D is an enlarged view of a portion of the slider of Fig. 6C;

Fig. 6E is a front view of the slider shown in Fig. 6A;

FIG. 6F is a section through the slide shown in FIG. 6E along the

Line VI-VI;

7A shows a further embodiment of a compass according to the invention;

Fig. 7B is a section through the compass shown in Fig. 7A along the line VII-VII;

FIG. 8A shows the circle shown in FIG. 7A in the locked state; FIG.

Fig. 8B is a section through the compass shown in Fig. 8A along the line VIII-VIII;

Fig. 8C is an enlarged section of the circle shown in Fig. 8B;

Fig. 8D is an enlarged view of the circle of Fig. 8A in the region of the locking device;

Fig. 8E is a similar view of a portion of the compass as in Fig. 8C, but in the unlocked state;

9A are perspective views of the slider of the to 9C circle shown in Fig. 8A;

FIG. 10A is a perspective view of a compass leg of the compass of FIG. 8A; FIG.

Fig. 10B is a side view of the compass leg shown in Fig. 10A; FIG. 1OC is an enlarged view of a portion of the compass leg of FIG. 10A; FIG.

11A is a front view of another embodiment of a compass according to the invention;

Fig. 11B is a perspective view of the circle shown in Fig. 11A;

FIG. 11C is a sectional view of the compass shown in FIG. 11A; FIG.

11D shows an enlarged view of the circle shown in FIG. 11D in the region of the locking device;

11E is an enlarged view of the circle in the locking device in the locked state. and

Fig. 12 is a perspective view of the slider of the compass shown in Fig. 11A.

The circle 1 shown in FIGS. 1A to 1 D consists essentially of a compass head 2 and two circular knuckles 3, 4 articulatedly connected thereto and a locking device 5. The locking device 5 comprises a movable slide 6 which is movable between a first position, in which a movement of the compass legs 3, 4 is possible and a second position in which the compass legs 3, 4 are blocked, is displaceable. The slider 6 is arranged on the compass leg 4 and slidable along a guide. As best seen in Fig. 1 D, the compass head 2 has a central recess in which the compass legs 3, 4 are received and hinged by means of cap screws 7. The slider 6 is displaceable in the longitudinal direction of the compass leg 4, a portion of the slider 6 is located partially in the recess of the compass head second FIGS. 2A, 2B and 2C show the circle 1 in the locked position. Fig. 2A is a perspective view of the circle 1, Fig. 2B is a front view of the circle 1 in the locked position, Fig. 2C is a sectional view of the circle 1 cut along the line M-II of Fig. 2B, Fig. 2D shows an enlarged section of the circle shown in Fig. 2C in the region of the compass head. Unlike in FIGS. 1A to 1D, the slider 6 is in the locked position, in which it prevents rotation or movement of the compass legs 3, 4. The slider 6 has been moved along a guide to Zirkelkopf 2 and blocked rotational movements.

3A to 3F show the circular head 2. Figs. 3A and 3B are perspective views, Fig. 3C is a partially sectional front view, Fig. 3D is a partially sectioned side view, Fig. 3E is a section through the in Fig. 3D shown along the line IM-III, Fig. 3F is an enlarged view of a section of the circular head 2 of Fig. 3A. The fork-shaped compass head 2 has screw holes 8, 9 to secure the compass legs 3, 4 with cap screws 7 on the compass head 2. On the inside of the compass head 2, in the region of the recess, this has a locking element designed as a recess 10 into which a projection of a locking element formed on the slider can be inserted. In other embodiments, a plurality of separate recesses may be provided.

Figs. 4A to 4C show the compass leg 4. Fig. 4A is a perspective view, Fig. 4B is a front view, and Fig. 4C is an enlarged view of the compass leg in the area of the compass head. At the lower end in Fig. 4A, the compass leg 4 has a receptacle 11 for a needle, a pen, a pencil lead or the like. At the opposite end of the compass leg 4 has a toothed segment 12 which cooperates with a corresponding toothed segment of the other circular leg 3, so that the toothed segments on the opening or closing of the compass roll on each other. By the tooth segments 12, the movement of the compass legs 3, 4 is synchronized, since an adjustment of a compass leg causes a corresponding synchronous movement of the other compass leg. As best in Fig. 4C, the circular leg 4 has on one side a groove 13 along which the slider is movable.

FIGS. 5A to 5H show different views of the slider 6. In the front view of FIG. 5B, it can be seen that the slider 6 has an eyelet 14, which is formed as a slot and through which the cap screw 7 is guided. The eyelet 14 prevents the release of the slider 6 from the compass. In Fig. 5F it can be seen that the slider 6 has a substantially U-shaped cross section, the lateral portions 15, 16 extend approximately perpendicularly from a central portion 17. In the mounted state, the lateral sections 15, 16 are guided on opposite surfaces of the compass leg 4. Trained as a groove 13 leadership of the compass leg 4 extends in the longitudinal direction. The slider 6 has on its inside a projection 18 which is guided in the groove 13. On the opposite, outer side of the slide 6, this has a projection 19 which is best seen in Fig. 5E and which is inserted into the recess 10 of the circular head 2.

When the slider 6 is in the unlocked position shown in Figs. 1A to 1D, the compass legs 3, 4 can be moved. When the slider 6 is pushed along the guide to the circle head 2, the projection 19 of the slider 6 engages in the recess 10 of the compass head 2 and blocks movement of the compass legs 3, 4. In this embodiment, the locking is achieved by positive locking.

Figures 6A to 6F show a slider according to a second embodiment of a compass. The slider 20 has a substantially U-shaped cross-section in accordance with the first embodiment, and has lateral portions 15, 16 and an eyelet 14. As shown in Fig. 6D, the slider 20 on its outer side as a wedge surface 21 formed Locking element which is in the assembled state between compass legs and circle head and cooperates with a counter-surface designed as arranged on the compass leg locking element. When the slider 20 is slid toward the compass head, the slider 20 is over its wedge surface 21 is a force on the compass legs and the compass head and tries to press them apart. However, since compass head and compass legs are connected to each other via the cap screw, only the static friction between compass legs, slide and compass head increases, whereby a clamping and locking is achieved.

FIGS. 7 to 10 show a third exemplary embodiment of the invention, in which the locking element having a wedge surface is guided on an adjusting spindle.

Fig. 7A is a front view of a circle, Fig. 7B is a view of the circle shown in Fig. 7A cut along the line VII-VII. Fig. 8A is a view similar to Fig. 7A, Fig. 8B is a sectional view taken along the line VIII-VIII in Fig. 8A, and Fig. 8C is an enlarged section of Fig. 8B in the area of the compass head. A slider 22, which has a locking element designed as a wedge surface 28, has a threaded bore 23, through which an adjusting spindle 24 is guided. An adjusting 25 is rotatably connected to the adjusting spindle 24. The adjusting spindle 24 and the slide 22 are arranged in a recess 26 of the circular leg 27. At its front, directed to the compass head side of the slider 22 has the wedge-shaped projection 28 which can be pushed between the compass head 2 and compass legs 27 to achieve a lock.

In Fig. 8E, the compass is shown in the unlocked state. The slider 22 is located approximately in the middle of the adjusting spindle 24, the wedge-shaped projection 28 of the slider 22 is located outside the recess formed between the compass head 2 and the compass leg 27. 8C and 8D show the compass in the locked state, the wedge-shaped projection 28 has been moved along the guide and is located within the compass head 2 and clamped with the compass leg 27th

FIGS. 9A to 9C are perspective views of the slider 22 with its wedge-shaped projection 28. FIGS. 10A to 10C show the compass leg 27, which has a recess 29 for the slide 22.

Figs. 11A to 11D show another embodiment of a compass 36. Similar to the previous embodiment, the compass 36 has a slider 30 which is movable along a guide by means of an adjusting spindle 31. The circular head facing surface 32 of the slider 30 is adapted to the shape of an opposite clamping surface 33 of the compass head. The clamping surface 33 is arranged concentrically with respect to the axis of rotation 34 of the circular leg 35. In Fig. 11 D, the slider 30 is shown in the unlocked position, by rotating the adjusting spindle 31, the slider 30 can be moved to the compass head until it is in the position shown in Fig. 11 E. The surface 32 and the clamping surface 33 are flat against each other, whereby the desired locking of the compass arm 35 is achieved relative to the compass head 2. Fig. 12 shows the slider 30 in a perspective view.

Claims

claims

A compass comprising a compass head and two pivotally connected compass legs and a locking device including a movable slide which is movable between a first position in which movement of the compass legs is possible and a second position in which the compass legs are blocked , is displaceable, characterized in that the slide (6, 20, 22, 30) on one of the compass legs (4, 27, 35) is arranged and displaceable along a guide.

2. compass according to claim 1, characterized in that the guide has a groove (13) or a recess in which a corresponding counter-trained projection (18) is slidably disposed, wherein the projection (18) either on the slide (6, 20) or is arranged on a compass leg.

3. compass according to claim 1 or 2, characterized in that the guide is substantially parallel to the compass legs (4, 27, 35) or obliquely thereto or along a circular path.

4. compass according to claim 1, characterized in that the slide (6, 20) surrounds a compass leg (4) at least partially.

5. compass according to claim 4, characterized in that the slide (6, 20) has a substantially U-shaped cross section, the lateral portions (15, 16) are guided on opposite surfaces of the compass leg (4).

6. compass according to one of the preceding claims, characterized in that the locking device has a first on the slide (6, 20, 22, 30) arranged locking element, which with a second on Gimbal (4, 27, 35) and / or arranged on the compass head locking element cooperates generating a form-fitting.

7. Compass according to claim 6, characterized in that the first or second locking element has a recess (10) into which a correspondingly formed projection (19) of the other locking element can be inserted.

8. compass according to claim 7, characterized in that the first or second locking element for locking at different opening angles a plurality of recesses (10).

9. compass according to one of the preceding claims, characterized in that the slide (6, 20) designed as a slot eyelet (14), by means of which it is held on the compass head (2).

10. Compass according to one of the preceding claims, characterized in that both compass legs (3, 4, 27, 35) preferably via a toothing (12) are coupled together.

11. Compass according to one of claims 1 to 9, characterized in that each compass leg is associated with a slide.

12. Compass according to one of the preceding claims, characterized in that the locking device has a first on the slide (6, 20, 22, 30) arranged locking element with a second on the compass legs (3, 4, 27, 35) and / or arranged on the compass head locking element cooperates generating a frictional connection.

13. compass according to claim 12, characterized in that the first or second locking element has a wedge surface (21) which is clamped against a mating surface of the other locking element.

14. compass according to claim 12 or 13, characterized in that the wedge surface having slide (22, 30) on an adjusting spindle (24, 31) is guided and by rotation of the adjusting spindle (24, 31) is displaceable.

15. Compass according to claim 14, characterized in that the adjusting spindle (24, 31) in a recess of the compass leg (27, 35) is arranged.

16. Compass according to claim 14 or 15, characterized in that the slide (22) has a wedge-shaped projection (28) formed locking member which is clamped between the compass head (2) and the compass legs (27).

17. Compass according to claim 14 or 15, characterized in that the slide (30) has a surface (32) which can be pressed against an opposite clamping surface (33) of the compass head (2).

18. compass according to claim 17, characterized in that the clamping surface (33) of the compass head (2) is formed substantially concentric with the axis of rotation (34) of the compass leg (35).