MXPA97006733A - Improved instruments to draw circu - Google Patents

Abstract

The present invention relates to a device for forming circles with a marking instrument on a drawing surface, comprising: a first rotating member having an opening formed therein, the first rotating member is substantially flat, the first rotating member it has a plurality of holes disposed therein, the holes admit the marking instrument used to form the circles, a second rotary member located resiliently within the opening and in coplanar form therewith, the second rotating member has a plurality of holes provided therein, the holes admit the marking instrument used to form the circles, a combination means for elevating the second rotating member above the drawing surface, to avoid the smearing of the lines on the surface and for coupling with the drawing surface and stabilizing the second rotating member on the surface e) said combination means, includes an opening for locating the second rotating member on a central point of a circle, and a lifting means for separating the first rotating member above the drawing surface, to avoid the busing of the lines on the surface, the first rotating member is lifted by the lifting means at about the same level as the second rotating member

Description

IMPROVED INSTRUMENTS FOR DRAWING CIRCLES FIELD OF THE INVENTION This invention relates to devices for forming circles. More particularly, this invention relates to devices for forming circles on hard surfaces, such as the surfaces of mylar and glass found in the use of overhead projectors.

BACKGROUND OF THE INVENTION In the prior art there are numerous devices for forming circles. Some of these devices require sharp pivot points to which the pivot arms are connected with a marking means for inscribing the circles. However, these devices are unsuitable for use on hard surfaces, such as on glass or mylar surfaces found during the use of overhead projectors. This is because the sharp pivot points deteriorate the surfaces on which the circle is being inscribed by leaving small holes in the mylar surface or permanently scratching the glass surface. In addition, the sharp tips of these devices make them unsafe. Consequently, in an effort to avoid P1247 / 97MX problems associated with these prior art devices have been designed devices to form circles that do not have sharp points. One of these devices is presented in U.S. Patent No. 4,353,166 and comprises a flat member with a circular hole adjacent to one end. A rotating disc is retained in a releasable manner inside the building. A series of small holes, sized to receive the marking instrument, are spaced from the center point of the disk towards the far end of the flat member, at specific intervals. During use, the disc is held at the desired location or position and large circles are formed by holding the flat member at the desired location, inserting the marking instrument into the desired hole and rotating the flat member around the disc. Small circles are formed by inserting the marking instrument into the desired hole of the disc and rotating the disc within the flat member. Another device for forming circles is presented in U.S. Patent No. 4,530,156, which comprises a flat member with a first rotating disk having a series of holes spaced at intervals and sized to receive a marking instrument. A second rotating disk is arranged P1247 / 97MX inside the first rotating disc and has at least one hole to receive the marking instrument. The rotational position of the second disk can be changed with respect to the first disk, to adjust the separation of the hole in the second disk, from a central point of the first disk. While the above devices provide a means for forming circles on surfaces of mylar, glass and other delicate surfaces, there are problems associated with their use. For example, these devices frequently glide over the surface during the formation of the circle. This sliding movement causes the circles to form asymmetrically. In addition, since these surfaces are often non-absorbent (unlike, for example, paper), the wet lines on the surface of the pattern frequently occur as the flat members and / or rotating discs rub against the surface. Drawing surface during rotation. This busbar is especially predominant with wet feather ink with felt or nylon tips, used on the drawing surfaces displayed or displayed using overhead projectors. In accordance with the above, an object of the present invention is to provide a device for P1247 / 97MX form circles, which are firmly coupled with the drawing surface, to stabilize the device on the surface, during the construction of the circle. Another object of the present invention is to provide a device for forming circles, which avoids the smearing of the stwet lines on the drawing surface, during the formation of the circles. Another object of the present invention is to provide a device for forming circles, which facilitates the location or positioning of the device on the center point of a circle and / or the marking of the center point of a circle with a marking instrument. A further objective of the present invention is to provide a device for forming circles that is relatively inexpensive.

SUMMARY OF THE INVENTION The present invention fulfills the foregoing objects by providing a device for forming circles on a drawing surface, including a first rotary member and a second rotary member. The first rotating member is substantially planar and includes an opening formed therein. The second rotating member is resiliently located within the opening. A lifting means separates the first member P1247 / 97MX rotating above the drawing surface, to avoid smearing wet lines on the surface. A combination means elevates the second rotating member above the drawing surface also, to prevent smearing of the still wet lines on the surface, and also firmly engages with the drawing surface, to stabilize the second rotating member on the surface. surface. The combining means preferably elevates the second rotating member at approximately the same level as the first rotating member. A plurality of holes are arranged or located on the rotating members and admit the marking instruments used to form the circles. The opening in the first rotating member is generally circular and comprises alternating upper and lower tabs, disposed along its circumference. The second rotating member is a generally circular disc comprising a circumferentially extending flange and releasably engaging the tabs to rotatably retain the disc within the hole. The holes in the rotating members are separated at calibrated intervals to admit different radii of circles. In a preferred embodiment, the lifting means P1247 / 97MX comprises at least one depression arranged or located in the lower part of the first rotating member. In the same way, the combination means comprises an eye with a smooth top surface and a rough bottom surface in the second rotary member. The rough surface of the eye includes a plurality of beveled teeth (which are preferably projected such that their leading edges are not coplanar), to lift the second rotating member above the drawing surface and to engage the drawing surface and stabilize to the rotating member. Alternatively, a series of similar irregular projections or other rough surface could be molded in or on the member, to form the rough lower surface. The eye in the preferred embodiment further includes an opening for locating the second rotating member on the center point of a circle and / or for marking the center point of the circle with a marking instrument. The combination means is located centrally on the second rotating member. During use, the first rotating member (with the marking instrument coupled) is rotated about the second rotary member, to form circles having a radius greater than the radius of the second rotary member. The rough surface of the eye of the second P1247 / 97MX rotating member engages with the drawing surface, as the first rotating member is rotated, so that the second rotating member remains stationary on the drawing surface to form a symmetrical circle. In addition, the depressions lift the first rotating member above the drawing surface, to avoid smearing the still wet lines on the drawing surface. Similarly, the second rotating member (with the marking instrument) is rotated within the first rotating member to form a circle with a radius less than the radius of the second rotating member. In addition, a marking instrument can be inserted into a hole in a plurality of large holes in the template in the second rotary member to form circles having diameters smaller than the smaller diameters of the circles formed with the second rotary member. In each case, the eyelet separates the second rotating member above the drawing surface, to avoid smearing the still wet lines on the surface. In an alternative embodiment, there are no depressions located or arranged along the base or bottom of the first rotating member (not shown). However, the second rotating member includes an eyelet. The above objectives and advantages of the P1247 / 97MX, as well as others, will be apparent from the following detailed description of the preferred embodiment, which refers to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a top plan view of the device of the invention for forming circles, - Figure 2 is a bottom plan view of the circle forming device of Figure 1; Figure 3 is a top plan view of the first rotary member of Figure 1; Figure 4 is a top plan view of the second rotary member of Figure 1; Figure 5 is a side view of the circle forming device, taken along line 5-5 of Figure 1; Figure 6 is another side view of the circle-forming device of Figure 5, illustrating its elevated appearance, above the drawing surface during the construction of the circle; Figure 7 is a top plan view of the circle-forming device of Figure 1 illustrating the rotation of the first rotating member; and Figure 8 is a top plan view of the circle forming device of Figure 1 illustrating P1247 / 97MX the rotation of the second rotating member.

DETAILED DESCRIPTION OF THE INVENTION Referring generally to Figures 1-6, the invention constitutes a device for forming circles on a drawing surface, denoted by the number 10, and comprising, in part, a first rotary member 12 and a second rotary member 14. A first means 16 elevates the first rotating member above the drawing surface to prevent the wet lines from being smeared on the surface. A second means 18 elevates the second rotating member above the drawing surface, to avoid smearing the still wet lines on the surface of the pattern, and engages with the drawing surface to stabilize the second rotating member on the surface. A plurality of holes 20 is located in the first and second rotating members, and the holes are adapted to admit a marking instrument to form the circles. As shown in Figures 1-5, the first rotary member 12 is substantially flat and includes an upper part 22 and a lower part 24. A generally circular opening 26 with a circumferential wall 28 is formed at one end of the first rotating member 12. The upper tabs 30 e P1247 / 97MX alternate 32 project radially towards the center, from the circumferential wall 28 of the opening 26. The second rotary member 14 is a generally circular disc and includes an upper part 34 and a lower part 36, which are coplanar with the upper part 22 and lower part 24, respectively, of the first rotating member 12. The second rotating member 14 includes a circumferentially extending flange 38 which resiliently engages with the alternating tabs 30, 32 of the opening 26, to retain rotating shape to the disc inside the hole. The lifting means 16 is disposed in the lower part 24 of the first rotating member 12 and includes at least one depression (Figures 2, 5). The lifting means 16 separates the first rotating member 12 above the drawing surface 40, to avoid the wetting of the still wet lines on the surface (Figures 5, 6). In the preferred embodiment, there are at least three pairs of depressions 42, 44, 46 disposed in the lower part 24 of the first rotating member 12. The pairs of depressions 42, 44, 46 are spaced from each other and generally located at the distal end of the first rotary member 12, adjacent the second rotary member 14, and generally at the middle center of the distal end and of the second rotary member (Figure 2). P1247 / 97MX A combination means 18 is centrally located in the second rotating member 14 and comprises a hard metallic eye 47 (Figures 1, 2) . The combination means 18 elevates the second rotating member 14 above the drawing surface 40 to prevent the wet lines from smearing on the surface and engages with the drawing surface to stabilize the second rotating member 14 on the surface ( Figure 6). The combination means 18 comprises a smooth surface 48 on the upper part 34 of the second rotary member 14 and a rough surface 50 on the lower part 36 of the member. The rough surface 50 of the combination means 18 comprises a plurality of beveled teeth 52, which engage with the surface to stabilize the second rotating member 14 (Figure 2). Preferably the teeth will be bevelled in a non-uniform manner, to present a series of rougher and non-coplanar edges of teeth. The combination means 18 also comprises an opening 54, for locating the second rotary member 14 on the center point of the circle and / or for marking the central point with a marking instrument. The combination means 18 elevates the second rotary member 14 at approximately the same level as the first rotary member 12 (Figures 5, 6). The holes 20 in the first rotating member P1247 / 97MX 12 and the first rotary member 14, are spaced at calibrated intervals and include indicia 56 adjacent to the holes, for the selection of a predefined radius to draw a circle (Figure 1). The tip portion 58 of a marking instrument 60 is inserted into one of the holes 20 to form circles with varying diameters (Figure 6). For example, the tip portion 58 can be inserted into one of the holes 20 of the first rotary member 12, to form larger circles with diameters from, for example, 1/4 inch to 10 inches (1.91 cm to 25.4 cm). Likewise, the tip portion 58 can be inserted into one of the holes 20 of the second rotary member 14, to form smaller circles with diameters from, for example, / Q inch to / 8 inch (1.6 cm to 4.14 cm ) in addition, the tip portion 58 can be inserted into a hole of a plurality of large template holes 62 of the second rotary member 14, to form even smaller circles with diameters from, for example, 1/4 inch to / 2 inch (0.64 cm to 1.27 cm) (Figures 1 and 2). During use, the second rotating member 14 is located within the opening 26 of the first rotary member 12 and the device 10 is positioned on the drawing surface. A circle that has a greater radius P1247 / 97MX that the radius of the second rotary member 14 (or, for example, a diameter from 1/4 inch to 10 inches (4.45 cm to 25.4 cm)) is drawn by approaching the center point of the unformed circle and placing the eye 47 of the second rotary member 14 on the point The center point of the circle can be marked by passing the tip portion 58 of the marking instrument 60 through the opening 54 of the eye 47. The tip portion 58 of the marking instrument 60 is then inserted. in the hole appropriately marked in the first rotary member 12, as the second rotary member 14 and the eye 47 are held firmly against the drawing surface (as indicated by arrow A of Figure 6). Rotary 12 is rotated about the second rotating member 14 (as indicated by arrow B of Figure 7), tip portion 58 marks the drawing surface beneath the first rotating member river, until a circle has been inscribed on the surface. During this process, the eye 47 engages with the surface as the first rotary member 12 is rotated, so that the second rotary member 14 remains stationary on the drawing surface to form a symmetrical circle. In addition, the pairs of depressions 42, 44, 46 elevate the first rotary member 12 above the drawing surface, to avoid P1247 / 97MX smeared with wet lines on the drawing surface. A circle having a radius smaller than the radius of the second rotating member 14 (or, for example, a diameter from / inch to 1 / g inch (1.6 cm to 4.14 cm)) is drawn by approaching the center point of the circle not formed and placing back to eye 47 on the point. The tip portion 58 is inserted into the hole, appropriately marked, of the second rotating member, as the first rotary member 12 is held firmly on the drawing surface. The second rotating member 14 is then rotated within the opening 26 of the first rotating member (as indicated by the arrow C in Figure 8) until a circle is formed on the drawing surface. In addition, a circle having a radius that is smaller than the smallest circle formed by the rotation of the second rotating member (or a diameter from 1/4 inch to 1/2 inch) can be drawn by inserting the tip portion 58 in one of the holes 62 of the template of the second rotating member 14 and moving the marking instrument along the inner circumferential wall of the template hole, as indicated by arrow D of Figure 8. In each case, the eye 47 raises the second rotary member 14 P1247 / 97MX above the drawing surface, to avoid smearing wet lines on the surface. Additional marks 64 can be located along the linear edges of the first rotating member 12 (Figure 1). For example, these marks can include a scale in inches and a metric, which can be used to make measurements. While the device 10 is adapted to be used with a drawing surface made of mylar or glass of an overhead projector, it also has application on other hard or nonabsorbent surfaces, including, without limitation, wood, metal and plastic. The material from which the rotating, first and second members of the device 10 are constructed is preferably a transparent plastic material for observing the circle below the device as it is being drawn. The eye 47 is preferably made of brass or any other suitable metal.

In addition, the device 10 has not been described in terms of its approximate measurements, since it should be understood that the dimensions of the device may vary according to the needs. Therefore, it should be recognized that, while the invention has been described with respect to a preferred embodiment thereof, those experienced in the P1247 / 97MX technique can develop a wide variation of structural details without deviating from the principles of the invention. In accordance with the foregoing, the appended claims will be construed as covering all equivalents that fall within the scope and spirit of the invention.

P1247 / 97MX

Claims (1)

1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following CLAIMS is claimed as property; The device according to claim 21, wherein the first rotating member includes an upper part and a lower part and the lifting means is disposed or located in the lower part. The device according to claim 21, wherein the lifting means comprises at least one depression. The device according to claim 21, wherein the second rotating member includes an upper part and a lower part and the combining means comprises a smooth upper surface, in the upper part, and a rough lower surface, in the lower part. The device according to claim 4, wherein the rough portion comprises a plurality of sharp projections for coupling with the surface of the pattern to stabilize the second rotating member. The device according to claim 4, wherein the rough portion comprises a plurality of bevelled metal teeth for engaging with the surface of the P1247 / 97MX drawing and stabilizing the second rotating member. The device according to claim 6, wherein the metal teeth are bevelled in a non-uniform manner. The device according to claim 4, wherein the rough portion is molded in or on the second rotating member. The device according to claim 1, wherein the combining means includes an opening for locating the second rotating member on a central point of a circle. The device according to claim 21, wherein the combining means is located centrally on the second rotating member. ll. The device according to claim 21, wherein the combining means comprises a metallic eye. The device according to claim 21, wherein the opening of the first rotary member is generally circular and includes upper and lower tabs, disposed or located along its circumference, and the second rotating member is a generally circular disc and includes a extending tab circumferentially, the flange resiliently engages with the tabs alternated to retain in shape P1247 / 97MX rotating the disc inside the hole. The device according to claim 21, wherein the holes of the first rotary member and the second rotary member are spaced apart at intervals. 21. A device for forming circles with a marking instrument on a drawing surface, comprising: a first rotating member having an aperture formed therein, the first rotatable member is substantially planar, the first rotatable member having a plurality of holes provided therein, the holes admit the marking instrument used to form the circles; a second rotatable member located resiliently within the aperture and in coplanar form therewith, the second rotatable member having a plurality of holes disposed therein, the holes admitting the marking instrument used to form the circles; a combination means for elevating the second rotating member above the drawing surface, to avoid smearing the lines on the surface and to engage with the drawing surface and stabilize the second rotating member on the surface; and a lifting means for separating the first rotating member above the drawing surface, P1247 / 97MX to prevent the busing of the lines on the surface, the first rotary member is lifted by the lifting means at approximately the same level as the second rotating member. P1247 / 97MX