JP2006015520A - Beam compass with scale - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide beam compasses with a scale, the indication position of a scale calibration of which can be seletively changed to the side of a beam or to the top surface of the beam. <P>SOLUTION: In these beam compasses, the scale calibration M is provided on at least one side of the beam 2 along its longitudinal direction. These beam compasses are equipped with the nearly square crosssectional beam mounted with a line drawing tool holder 3 enabling to hold with a line drawing tool P at one end part of the beam under the condition that the holding direction of the tool P is selected to either one between two directions normal to the longitudinal direction of the beam and having a near square hole, which is surrounded by four wall surfaces and through which a beam slidably passes, an indicating window with a central part provided with a cursor line opposing to the scale calibration is open to one of these wall surfaces, a needle holder 5 having a through-formed threaded hole respectively on at least each one between two wall surfaces orthogonally adjacent to each other and on another wall surface opposing to the wall surface, a compass needle 8 selectively threaded to one of these threaded holes and a locking thread 6 for fixing the needle holder to the beam by being selectively threaded to one of these threaded holes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scaled beam compass suitable for drawing a circle having a relatively large diameter.

Conventionally, a needle holder and a drawing tool holder are attached to a horizontal beam, and one or both of the attachment positions of these holders with respect to the beam are made variable, and the drawing tool holder is centered on a compass needle attached to the needle holder. There is known a beam compass that draws a circle or an arc on a paper surface, a plywood plate, a metal plate or the like with a drawing tool such as a pencil or a scribing needle attached to the head. (For example, see Patent Document 1)
JP 49-126432 A

  In such a conventional beam compass, a scale scale is generally displayed on the beam, and based on this scale scale, the distance between the centers of the compass needle and the drawing tool can be adjusted to the radius of the circle or arc to be drawn. In many cases, the scale scale is displayed on the side surface of the beam. Depending on the work place and the work posture, it may be difficult to visually recognize the scale scale from the lateral direction.

  If the scale scale is displayed on the upper surface of the beam, it is relatively easy to see the scale scale. However, if you do not have space for the upper body of the person to enter above the beam compass, the scale scale should be tilted. In addition, when used in an environment with falling objects such as oil and dust from above, there is a problem that the scale scale on the upper surface of the beam is easily contaminated by these falling objects.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a beam compass with a scale that eliminates the problems in the prior art as described above and can selectively change the scale graduation display position to the beam side surface and the beam upper surface. .

  A scaled beam compass provided to achieve the above-mentioned object has a substantially square cross section, and has a scale scale on at least one side surface along the longitudinal direction thereof, and one of the beams. A drawing tool holder that can be attached to the end of the beam and can hold the drawing tool by selecting one of the two directions perpendicular to the longitudinal direction of the beam, and the beam slidably penetrates through the inside. There is a substantially square hole surrounded by four wall surfaces, and one of these wall surfaces is opened with a display window with a cursor line facing the scale scale of the beam in the center, and perpendicular to this wall surface. A needle holder having a screw hole penetrating in each of at least one of the two wall surfaces adjacent to each other and the other wall surface facing the opposite side, and a male screw portion selectively screwed into one of these screw holes Have A lock that has a compass needle, a male thread portion that is selectively screwed into one of these screw holes, and a rotation operation portion, and that fixes the beam to the needle holder by rotating and tightening the rotation operation portion. And an origin of the scale scale of the beam is set so as to substantially coincide with the center position of the drawing tool held by the drawing tool holder.

  In the beam-compass with a scale of the present invention, an extension beam provided with a scale graduation that is continuous with the scale graduation provided on the beam at the end opposite to the end where the beam drawing tool holder is attached is provided. It is desirable to have a structure that can be detachably attached.

  Moreover, in the beam compass with a scale of the present invention, it can be attached to one end of the beam by exchanging it with a drawing tool holder, and when attached to the tip of the beam, the scale graduation provided on the beam It is also desirable to provide a scale adapter provided with a scale graduation whose end face is the origin position continuously.

  In the beam compass with a scale of the present invention, the compass needle has a male screw portion and a rotation operation portion that are screwed into a screw hole of the needle holder, and the needle holder is turned into a beam by rotating and rotating the rotation operation portion. It is also desirable to use a lock screw for fixing.

  According to the first aspect of the present invention, when a circle with a target radius is to be drawn, a circle with various radii can be easily obtained by aligning the cursor line of the display window of the needle holder with the scale mark displayed on the beam. Can be drawn to.

  At this time, by changing the direction of the drawing tool holder and the direction of the compass needle relative to the needle with respect to the beam, the scale graduation provided on the beam is changed to the horizontal posture and the upward posture according to the work location and the work posture. Either can be selected and used.

  According to the second aspect of the present invention, it is possible to draw a larger-diameter circle or arc by adding an extended beam to the beam.

  According to the invention described in claim 3, the entire length of the beam can be used as a scale by attaching a scale adapter to the tip side of the beam instead of the drawing tool holder.

  Further, according to the invention described in claim 4, since the compass needle also serves as a lock screw for fixing the needle holder to the beam, the number of parts can be reduced and the structure of the needle holder can be simplified. Therefore, the manufacturing cost can be reduced.

  FIG. 1 is a side view showing the overall structure of a beam compass with a scale according to the present invention (hereinafter simply referred to as a beam compass). The beam compass 1 has an elongated beam 2. The beam 2 has a square cross section, and in this embodiment, the beam 2 is made of an aluminum hollow material to reduce weight. Note that stainless steel or the like may be used as the material of the beam 2.

  A drawing tool holder 3 is attached to one end of the beam 2. As shown in FIG. 2, the drawing tool holder 3 has a pair of clamp plates 3A and 3B for holding the drawing tool P, and is passed between the clamp plates 3A and 3B. A bolt 3C and a wing nut 3D are used to fix and hold a drawing tool P such as a pencil, a ballpoint pen, an oil pen, or a scribing needle, which is clamped between the clamp plates 3A and 3B. .

  A connecting piece 3E having a square cross section that fits the opening of the end face of the beam 2 is fixed to the back surface of one clamp plate 3B of the drawing tool holder 3. Each side surface of the connecting piece 3E is provided with a ball stopper B which is spring-biased so that a part of the connecting piece 3E always protrudes outward, and the connecting piece 3E is inserted from one opening end of the beam 2. Thus, the ball stopper B is engaged with the stopper hole H formed in the vicinity of the end of the beam 2 so that the drawing tool holder 3 is securely fixed to the beam 2.

  The drawing tool holder 3 can be attached by selecting the direction of the connecting piece 3E in one of two directions perpendicular to the longitudinal direction of the beam 2.

  Further, as shown in FIG. 2, a scale graduation M is provided on one side surface of the beam 2. The scale scale M is scaled so that when the drawing tool holder 3 is mounted on the beam 2, the center position of the drawing tool P held by the beam 2 is the origin, and in this embodiment, By removing the drawing tool holder 3 from the beam 2 and mounting a scale adapter 4 instead, the entire length of the beam 2 can be used as one scale.

  In this embodiment, the scale adapter 4 is made of an aluminum material, and its front end portion 4A has the same cross-sectional shape as that of the beam 2, and a connecting piece 3E of the drawing tool holder 3 on the rear side thereof. A connecting piece 4B having a ball stopper B having the same structure is integrally provided, and one side surface of the front end portion 4A is continuous with the scale graduation M of the beam 2 and the end surface position of the front end portion 4A is set as the origin. A scale graduation M1 is provided.

  The connecting piece 4B is inserted into the beam 2 and the scale adapter 4 is fixed to the tip of the beam 2 at the position where the ball stopper B is engaged with the stopper hole H of the beam 2. At this time, the scale scale M and the scale scale M1 are It has come to be a series. The drawing tool holder 3 and the scale adapter 4 mounted on the beam 2 can be detached from the beam 2 by releasing the engagement between the ball stopper and the stopper hole H by slightly pulling.

  Moreover, as shown in FIG. 1, the needle holder 5 is attached to the beam 2 so that the attachment position can be adjusted in the longitudinal direction. 3 to 5, the needle holder 5 has a square hole a through which the beam 2 penetrates in the longitudinal direction, and four wall surfaces 5A, 5B, 5C, 5D surrounding the hole a. One display window 5E has a display window 5E, and a cursor line C is provided at the center of the display window 5E.

  The cursor line C is a piano line in this embodiment, and is fixed by inserting both ends into small holes formed on both sides of the display window 5E of the needle holder 5, and the visibility on the scale scale M is visible. In order to improve the surface, the surface is painted red. Instead of providing such a cursor line C, a glass plate on which the cursor line is drawn may be fitted in the display window 5E.

  The three wall surfaces 5B, 5C, and 5D other than the wall surface 5A provided with the display window 5E of the needle holder 5 are respectively formed with threaded holes N having the same shape, and the screw holes N of the wall surface 5B have a lock. The male screw portion 6A of the screw 6 is screwed.

  In addition, a leaf spring 7 that is easily elastically deformed is incorporated between one side surface of the beam 2 inserted into the hole a and the inside of the wall surface 5B, and a rotation operation portion 6A of the lock screw 6 is provided. Is turned with a finger to screw the male screw portion 6B into the screw hole N, and when the tip portion is pressed against the leaf spring 7, the leaf spring 7 is pushed against the side surface of the beam 2, and between the beam 2 and the leaf spring 7 The needle holder 5 is securely fixed to the beam 2 by the frictional force acting on.

  The lock screw 6 can be replaced with a standard hexagon socket head bolt. In this case, the hexagon socket head bolt can be tightened using a hexagon wrench. It can be fixed more firmly.

  Here, the leaf spring 7 is used because the load is concentrated when the tip of the lock screw 6 is brought into direct contact with the side surface of the beam 2 and this side surface may be damaged. The material of the beam 2 may be omitted if the material is hard and high in strength, for example, stainless steel having been hardened to increase the surface hardness. The needle holder 5 can be made of a resin material. However, since a certain degree of rigidity and work accuracy are required, after forming a material such as aluminum or stainless steel with lost wax or the like, a necessary portion is formed. It is desirable to manufacture by machining.

  In addition, the male screw portion 8A of the compass needle 8 is screwed into and fixed to the screw hole N on the wall surface 5D side of the needle holder 5. The compass needle 8 has a conical tip portion 8B on the side opposite to the side where the male screw portion 8A is formed.

  The length of the male screw portion 8A of the compass needle 8 is slightly shorter than the total length of the screw hole N, and the tip of the male screw portion 8A protrudes into the hole a of the beam 2 with the compass needle 8 attached to the needle holder 5. The side of the beam 2 is not hit.

  In the beam compass 1 of the present invention, it is selectively used in two modes: a mode in which the scale graduation M is turned sideways as shown in FIG. 3 and a mode in which the scale graduation M is faced up as shown in FIG. be able to. In any aspect, the value at the position of the cursor C of the scale graduation M visible through the display window 5E is the distance R between the center of the drawing tool P and the center of the compass needle 8 shown in FIG. , Corresponding to the radius of a circle or arc drawn on the drawing surface S by the beam compass 1.

  When the beam compass 1 is used in the mode of FIG. 6, the compass needle 8 is removed from the screw hole N of the wall surface 5D of the needle holder 5 and fixed to the screw hole of the wall surface 5C shown in FIG. At the same time, the mounting direction of the drawing tool holder 3 with respect to the beam 2 is changed so that the direction of the drawing tool P is aligned with the direction of the compass needle 8 whose mounting position is changed.

  Further, the beam compass 1 of the present invention has an extension beam 2A that is detachably connected to the beam 2 as shown in FIG. The extended beam 2A has the same cross-sectional shape as the beam 2, and is connected to the beam 2 by a connecting rod 9 formed in a square column shape having a square cross section shown in FIG.

  FIG. 8 is a partial cross-sectional view showing a state in which the beam 2 and the extension beam 2A are connected by the connecting rod 9. As shown in FIG. 8, the connecting rod 9 includes both the beam 2 and the extension beam 2A. When both end portions are inserted into the beam 2 and the extension beam 2A are inserted until they come into contact with the stopper pins 10 protruding inward from the respective side walls, the coil provided on the connecting rod 9 is located at this position. The ball stopper B biased by the spring 11 is engaged with the stopper holes H formed on the side walls of the beam 2 and the extension beam 2A. At this position, the beam 2 and the extension beam 2A are connected via the connecting rod 9. Connected together.

  When the extension beam 2A is removed from the beam 2, the ball stopper B of the connecting rod 9 resists the urging force of the coil spring 11 if they are pulled apart from each other, and the stopper of either the beam 2 or the beam 2A. The beam 2 and the extension beam 2A are separated from the hole H. The connecting rod 9 may be fixed to the extended beam 2A side.

  Next, FIG. 9 is a cross-sectional view showing the structure of a needle holder in another embodiment of the present invention, and the other parts are the same as those in the above-described embodiment. In the present embodiment, a compass needle 8 'that also functions as a lock screw is used, and a male screw portion 8'A that is screwed into the screw hole N of the needle holder 5' and the compass needle 8 'are rotated. A portion 8B ′ is provided.

  In the present embodiment, since an independent lock screw is not required, the position of the screw hole N is placed on the wall surface 5′C opposite to the wall surface 5A ′ provided with the display window 5′E and the wall surface 5A ′. When the display window 5'E is used in a horizontal direction only at two places on one right wall surface 5'D, the compass needle 8 'is formed on the wall surface 5'D as shown by the solid line in FIG. When the display window 5′E is used in an upward direction, the compass needle 8 ′ is oriented in the direction indicated by the phantom line and is attached to the screw hole N formed in the wall surface 5′C. . In the embodiment shown in FIG. 9, the distal end of the male screw portion 8'A directly contacts the beam 2. However, as described above, a leaf spring may be interposed between them.

  The present invention draws a circle with a drawing tool such as a pencil, ballpoint pen, or oil-based pen on a smooth surface such as paper, cloth, or plywood, or uses a scribing needle as a drawing tool to make a steel or aluminum plate. It can be used for the work of scribing a circle or arc on the surface.

It is a side view which shows the whole structure in one Embodiment of the beam compass with a scale of this invention. It is a disassembled perspective view of the front-end | tip part vicinity part of the beam compass with a scale of this invention. It is a fragmentary perspective view which shows the attachment state of the needle holder with respect to the beam at the time of using a scale scale in a horizontal attitude | position. It is a longitudinal cross-sectional view which shows the attachment structure to the beam of a needle holder. It is a cross-sectional view of a needle holder. It is a fragmentary perspective view which shows the attachment state of the needle holder with respect to the beam at the time of using a scale scale in an upward attitude | position. It is a partial exploded view which shows the connection structure between a beam and an extension beam. It is a fragmentary longitudinal cross-section which shows the connection structure between a beam and an extension beam. It is a figure which shows the cross-sectional structure of the needle holder in another embodiment of this invention.

Explanation of symbols

1 beam compass 2 beam
2A extension beam
3 Wire drawing tool holder 3A, 3B Clamp plate 3C Fixing bolt 3D Wing nut 3E Connection piece 4 Scale adapter 4A Front end 4B Connection piece 5 Needle holder 5A, 5B, 5C, 5D Wall surface 5E Display window 6 Lock screw 6A Rotation operation part 6B Male thread 7 Plate spring 8 Compass needle 8A Male thread 8B Tip 9 Connection piece 10 Stopper pin 11 Coil spring

Claims (4)

A beam having a substantially square cross section, and having a scale scale on at least one side surface along a longitudinal direction thereof;
A drawing tool holder attached to one end of the beam and capable of holding the drawing tool by selecting the orientation in one of two directions perpendicular to the longitudinal direction of the beam;
A display with a square hole surrounded by four wall surfaces through which the beam slidably penetrates, and a cursor line facing the scale scale of the beam on one of these wall surfaces. A needle holder in which a window is opened and at least one of two wall surfaces adjacent to the wall surface at right angles, and another wall surface facing the opposite side is formed with a screw hole therethrough;
A compass needle having a male thread portion that is selectively threaded into one of these screw holes;
It has a male screw portion that is selectively screwed into one of these screw holes and a rotation operation portion, and a lock screw that fixes the beam to the needle holder by rotating and tightening the rotation operation portion. ,
A scaled beam compass characterized in that the origin of the scale scale of the beam is set so as to substantially coincide with the center position of the drawing tool held by the drawing tool holder.   An extension beam provided with a scale graduation continuous with the scale graduation provided on the beam is detachably attached to the end opposite to the end to which the beam drawing tool holder is attached. A beam compass with a scale according to claim 1.   It can be attached to one end of the beam by replacing it with a drawing tool holder, has the same cross-sectional shape as the beam, and is continuous with the scale graduation provided on the beam tip when it is attached to the beam tip. 3. A beam compass with a scale according to claim 1 or 2, further comprising a scale adapter provided with a scale graduation whose end face is the origin position.   The compass needle has a male screw part that is screwed into the screw hole of the needle holder and a rotation operation part, and is also used as a lock screw that fixes the needle holder to the beam by rotating and tightening the rotation operation part A beam compass with a scale according to any one of claims 1 to 3.

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