JP2021030572A - compass - Google Patents

Abstract

To provide a compass provided with a writing instrument storage mechanism capable of putting together a compass to a smaller size in a state of holding the writing instrument on the compass to protect a tip part of the writing instrument and a needle of a central leg at the same time in placing temporarily the compass on a desk while holding the writing instrument in the course of a drawing work.SOLUTION: The compass comprises a central leg 10 having a needle 12 at a tip, a writing instrument holder 40 for holding a writing instrument 50, a rotary leg 20 for rotating the writing instrument holder 40 around the central leg 10, and an operation body 30 for pivotally supporting the rotary leg 20 and the central leg 10 so as to be freely openable and closable. The rotary leg 20 includes a rotary leg body 21, the writing instrument holder 40 disposed at a tip of the rotary leg body 21, and a writing instrument storage mechanism for storing a tip part 51 of the writing instrument 50 held by the writing instrument holder 40 into the rotary leg body 21.SELECTED DRAWING: Figure 1

Description

The present invention relates to a compass for drawing an arc, particularly suitable for use during learning.

Conventional compasses include a central leg having a needle at the tip, a rotating leg that holds a writing instrument such as a pencil at the tip and rotates it, a mounting body that pivotally supports the rotating leg and the central leg so as to open and close, and the mounting body of the mounting body. It is composed of an elongated substantially columnar operating body protruding upward (see, for example, Patent Document 1).

However, during learning, the drawing work is done while replacing the ruler and compass, so when the compass is temporarily placed on the desk with the needle of the central leg and the tip of the writing instrument exposed, it falls from the desk and the writing instrument. There is a risk that the tip of the pencil, which is the tip of the pencil, may break or come into contact with the user and cause injury.

For example, the invention described in Patent Document 2 proposes a compass that can carry a compass and a pencil in a small size and protect the tip of the compass by capping the legs of the compass. ..

However, the above-mentioned compass requires time and effort to remove the pencil, which is a writing instrument, and is not suitable for protecting the tip of the writing instrument even when it is temporarily placed on a desk during drawing work or the like.

Japanese Unexamined Patent Publication No. 10-193877 (Patent No. 3160761) Jitsukaisho 60-78495

Therefore, the compass can be kept small while the writing tool is held by the compass, and the tip and center leg of the writing tool can be held while the writing tool is temporarily placed on the desk during drawing work. A compass that can protect the needles at the same time is desired.

In view of the above problems, the present invention opens and closes a central leg having a needle at the tip, a writing instrument holding body that holds a writing instrument, a rotating leg that rotates the writing instrument holding body around the central leg, and a rotating leg and a central leg. Equipped with an operating body that freely supports the axis,
The rotating leg has a rotating leg main body and the writing tool holder provided at the tip of the rotating leg main body.
It has a writing instrument storage mechanism for storing the tip end portion of the writing instrument held by the writing instrument holding body in the rotating leg main body.

Further, in addition to the above-described configuration, the writing tool storage mechanism has a holding portion formed by bifurcating the tip of the rotating leg body and a writing tool holding body rotatably shafted on the opposite inner side surface of the holding portion. It is preferable to have a holding body shaft portion for supporting and a writing tool tip protection portion formed of a slit having an external shape of the tip portion of the writing tool in the vicinity of branching to the holding portion.

Further, in addition to the above-described configuration, the writing instrument holder preferably has a needle protection portion formed by bulging so as to cover the entire needle of the central leg.

Further, in addition to the above-described configuration, the writing instrument tip protection portion protrudes from the peripheral edge of the writing instrument tip protection portion that comes into contact with the writing instrument holder in a state where the tip portion of the writing instrument is directed in the same direction as the needle of the central leg and starts to draw an arc. It is preferable to have a pair of receiving pieces formed in the above.

Further, in addition to the above-described configuration, the rotary leg main body opens a surface on the central leg main body side from the base end to the tip of the rotary leg main body so that the central leg main body can be housed, and the inside of the rotary leg main body. It is preferable to have a hollow storage portion.

According to the invention of claim 1-5, while holding the writing tool on the compass, the entire compass can be aligned in a straight line and put together in a small size, and when the writing tool is temporarily placed on the desk during drawing work or the like. In addition, it is possible to provide a compass provided with a writing tool storage mechanism that simultaneously protects the tip of the writing tool and the needle of the central leg while holding the writing tool.

It is a perspective view which shows an example of the compass which concerns on embodiment of this invention. It is an enlarged perspective view seen from the back side of only the operation body of FIG. FIG. 2 is (a) front view, (b) rear view, (c) left side view, (d) right side view, (e) plan view, and (f) bottom view. It is the operation diagram of the compass in (a) the beginning of drawing, (b) the middle of drawing, and (c) the end of drawing of the arc used by the compass of FIG. 1, and the cross-sectional view showing the relationship between the operating body and the fingers, respectively. It is (a) enlarged perspective view and (b) enlarged exploded perspective view which shows the writing tool storage mechanism of FIG. It is (a) plan view, (b) left side side view, (c) right side side view which shows the state which the writing tool is stored by the writing tool storage mechanism of FIG.

Embodiments of the present invention will be described in detail with reference to FIGS. 1-6. In the description of the present embodiment, the center position of the predetermined arc is defined as the center of the circle, and the opening / closing direction of the central leg and the rotating leg is defined as the opening / closing direction X. The fingertip is a substantially curved portion from the tip of the finger to the pad of the finger, and the pad of the finger is a substantially flat portion from the tip of the finger to the periphery of the joint. The size is assumed to be about 1 cm to 3 cm.

(Embodiment)
The compass of the present invention includes a central leg 10 having a needle 12 at its tip, a writing instrument holder 40 that holds a writing instrument 50, a rotary leg 20 that rotates the writing instrument holder 40 around the central leg 10, a rotary leg 20, and a center. It includes an operating body 30 having a shaft portion 33 that pivotally supports the legs 10 so as to be openable and closable.

The central leg 10 includes a rod-shaped central leg main body 11 made of a metal material such as zinc as a main body, and a needle 12 at the tip of the central leg main body 11 for piercing and fixing it on a paper surface such as a notebook. Have. Around the tip of the central leg body 11, a thick portion 11a, which is about twice as thick as the base end, is provided to a length of about one-third of the entire central leg main body 11. Compared to the compass, the center of gravity of the entire compass is closer to the center leg 11 (particularly near the thick portion 11a) to have a lower center of gravity, so that the rotating leg 20 can be rotated with a light force when using the compass, which will be described later. It can be made easier to draw an arc.

The rotary leg 20 has a rotary leg body 21 formed mainly of a synthetic resin material such as a plastic material and a writing tool holder provided at the tip of the rotary leg body 21 so that the weight is lighter than that of the central leg 10. It has 40 and a writing tool storage mechanism for storing the tip of the writing tool 50 held by the writing tool holding body 40 in the rotating leg main body 21. Since the rotating leg 20 is relatively lighter than the central leg 10, the rotating leg 20 is rotated with a light force when the compass is used, which will be described later, to make it easier to draw an arc as compared with the conventional compass. Can be done.

The rotary leg main body 21 opens the surface on the central leg main body 11 side from the base end to the tip of the rotary leg main body 21 so that the central leg main body 11 described above can be stored, and the inside of the rotary leg main body 21 is hollow. The rotating leg is formed in a substantially U-shaped cross section, and the rotating leg can be stored in the vicinity of the tip of the rotating leg body 21 in a state where the thick portion 11a of the central leg body 11 and the writing tool 50 are rotated and stored. It has a storage portion 21a formed by slightly expanding the main body 21 as a whole.

The writing tool holder 40 has a fitting holding portion 41 for fitting and holding the writing tool 50 in a state of being inserted, and an annular tightening portion 42 for fixing and tightening the position of the writing tool holding body 40 in a state of being inserted into the fitting holding portion 41. And are integrally formed mainly of a synthetic resin material such as a plastic material. Further, the writing tool holding body 40 has a concave bearing portion 41a that rotatably supports the holding portion 21b of the rotating leg main body 21, which will be described later, and a central leg in order to store the writing tool 50 in the rotating leg main body 21. The needle protection portion 42a formed by bulging from the tightening portion 42 so as to cover the entire needle 12 of 10 is the same as the state in which the writing tool 50 is stored, the tip portion 51 of the writing tool 50, and the needle 12 of the central leg 10. It has engaging recesses 41b and 41b for fixing in a direction facing the direction. Further, the writing tool holder 40 is screwed into the opening portions 42b and 42b provided at both ends of the tightening portion 42 and the opening portions 42b and 42b in order to tighten and hold the writing tool 50 more firmly. It has a tightening screw 43 for adjusting the distance between the opening portions 42b and 42b.

The tightening portion 42 is a covering portion of the rotating leg body 21 when the writing tool holding body 40 is rotated to draw an arc and the tip portion 51 of the writing tool 50 is arranged in the same direction as the needle 12 of the central leg 10. A device having a substantially columnar protrusion 44 formed on the outer peripheral surface of the tightening portion 42 on the rotating leg body 21 side in order to abut on the outer peripheral surface in 24b and maintain the writing tool holding body 40 at a predetermined angle. Is.

As shown in FIGS. 2 and 3 (a) to 3 (f), the operating body 30 has a width w of about 1 cm that can sufficiently contact the fingertip and a finger between the fingertip and the joint. It is a thick, substantially pillar body having a height h of about 3 cm, which allows sufficient contact with the length of the abdomen. In the conventional compass, since the attachment body and the operation body with a thin shaft are arranged one above the other, it is not convenient for children, but the operation body 30 of the present embodiment is long (high) and thick. is there. The height h of the operating body 30 is long enough to have a lower end below the shaft portion 33 from the upper end thereof, and the width of the first picking surface 31a described later closes the rotating leg 20 and the central leg 10. It is thicker than the width of the state (see FIG. 6).

The operating body 30 of the present embodiment has a shaft portion 33 that pivotally supports the base ends of the central leg 10 and the rotary leg 20 so as to be openable and closable. It has a rolling portion 32 for rolling with a finger pad above 31. The knob portion 31 located below has a substantially triangular prism, and the rolling portion 32 located above has a substantially cylindrical shape. Both are continuous. Further, the operating body 30 is located in the left and right opening / closing directions X in order to insert the base ends of the central leg 10 and the rotating leg 20 from the lower end to the vicinity of the center of the operating body 30 and to open / close the central leg 10 and the rotating leg 20. It has a concave insertion portion 34 having an opening on the side surface of the above.

The grip portion 31 is at least an angle between the first grip surface 31a arranged parallel to the opening / closing direction X of the central leg 10 and the rotary leg 20 and the position where the insertion portion 34 is separated from the first grip surface 31a. It is composed of a substantially prismatic body having a second picking surface 31b and a third picking surface 31c which are inclined in the opening / closing direction X from the portion 35 to the first picking surface 31a and arranged in a substantially inverted V shape. It is a thing. In addition, in order to clarify an appropriate part for picking with a fingertip, as illustrated in this embodiment, three side surfaces of only the first picking surface 31a, the second picking surface 31b, and the third picking surface 31c. It is more preferable to consist of a substantially triangular prism. The term "abbreviation" includes a form in which the corners 35 and the like are rounded.

The first picking surface 31a is arranged so as to coincide with the shaft portion 33 of the operating body 30 at the center position of the fingertip of the thumb 61 while having a first plane region 36a such that the fingertip of the thumb 61 is sufficiently in contact with the fingertip. Let me. Further, the second picking surface 31b and the third picking surface 31c are the second plane region 36b and the third plane region 36c to the extent that the fingertips of the index finger 62 and the middle finger 63 are sufficiently in contact with each other, similarly to the first picking surface 31a. The index finger 62 and the middle finger 63 are arranged so as to easily hold the base end side of the rotary leg 20 and the central leg 10 via the respective gripping surfaces 31a, 31b, and 31c, respectively. Further, the widths of these plane regions 36a, 36b, and 36c have the maximum width on the lower end side of the operating body 30, and reach a height of about one-half to two-thirds of the height h of the operating body 30. It is gradually decreasing. It should be noted that the planar regions 36a, 36b, and 36c need not have a perfect planar shape, but may be sufficiently in contact with the fingertips as compared with the rolling portion 32 described later, and in the present embodiment, the maximum curvature is sufficient. It is curved so as to have a radius of about 12.5 mm.

In the rolling portion 32, the plane regions 36a, 36b, 36c of the above-mentioned knob portion 31 decrease upward, and the height h of the operating body is increased from about one-half to two-thirds to the upper end. If it has a slightly tapered shape, it is composed of a substantially cylindrical body having no corner 35 and having a diameter of about 1 cm, and the surface area of the side surface of the columnar body is such that at least the thumb 61 and the index finger 62 always contact each other. It has a size.

The writing instrument storage mechanism is formed by bending the tip of the rotary leg body 21 slightly outward from the center line of the rotary leg body 21 in the direction opposite to the center leg, and branching the tip of the rotary leg body 21 into a bifurcated shape. It has a holding portion 21b and a convex holding body shaft portion 22 for rotatably supporting the bearing portion 41a of the writing tool holding body 40 on the opposite inner side surface of the holding portion 21b.

The holding portion 21b is rotated in the vertical direction by about 180 degrees from a state in which the tip portion 51 of the writing instrument 50 faces the same direction as the needle 12 of the central leg 10 (a state in which drawing is started to be described later), and the rotating leg main body 21 The tip 51 of the writing instrument 50 (the tip of the pencil) is located near the branch of the holding portion 21b in a bifurcated shape so that the vicinity of the tip 51 of the writing instrument 50 can be protected when the writing instrument 50 is positioned on substantially the same straight line as the center line of the above. A writing instrument tip protection portion 24 composed of slits having an external shape (nearly) (approximately triangular shape in this embodiment), a state in which the writing instrument tip is stored so as to protect the tip, and both legs of the compass are opened with a predetermined width. It has engaging protrusions 23, 23 for fixing the writing instrument holder in the state.

The writing tool tip protection portion 24 comes into contact with the vicinity of the tightening portion 42 of the writing tool holding body 40 in a state where the tip portion 51 of the writing tool 50 is directed in the same direction as the needle 12 of the central leg 10 and starts to draw an arc. It has a pair of receiving pieces 24a, 24a formed so as to project from the vicinity of the lower end of the writing tool tip protection portion 24 to the extent that it does not contact the vicinity of the tip portion 51 of the writing tool 50 in order to prevent the 40 from rotating by 180 degrees or more. is there.

Further, the writing tool tip protecting portion 24 protects the writing tool tip in order to cover the tip portion 51 of the writing tool 50 from above and abut on the tightening portion 42 of the writing tool holding body 40 to maintain the angle of the writing tool holding body 40. It has a covering portion 24b formed in an umbrella shape extending from the entire side edge of the portion 24 and the upper surface of the rotating leg main body 21.

Next, the method of using the compass described above will be described in detail with reference to FIG.

(how to use)
First, the writing tool holder 40 is rotated to arrange the tip portion 51 of the writing tool 50 toward the needle 12 of the central leg 10, and then the central leg 10 and the rotating leg 20 are opened to open a predetermined radius. Set to. After that, while pressing the thumb 61 against the first picking surface 31a, the index finger 62 against the second picking surface 31b, and the middle finger 63 against the third picking surface 31c, the operating body 30 is picked with three fingers. 30 is rotated so as to be twisted, and a circle is drawn by operating from the beginning of drawing to the end of drawing, which will be described later.

The beginning of drawing is an operation of drawing a range of about 0 to 180 degrees in the center angle of the arc shown in FIG. 4A, and the needle 12 of the center leg 10 is fixed to the rotating leg 20 while being pierced into a paper surface such as a notebook. An appropriate load is applied to the writing tool 50 held by the writing tool holding body 40. At this time, while maintaining the balance of the entire compass on the side of the first picking surface 31a pressed by the thumb 61, the load is adjusted to the extent that the needle 12 of the central leg 10 is lightly pierced through the second picking surface 31b pressed by the index finger 62. At the same time, the tip portion 51 of the writing tool 50 is adjusted so as to apply a load capable of drawing a predetermined arc through the third picking surface 31c pressed by the middle finger 63.

During drawing, an arc is drawn in a range of approximately 180 to 270 degrees at the center angle of the arc shown in FIG. 4 (b), and the middle finger 63 is held on the third picking surface while maintaining the load in the drawing start state described above. As the distance from 31c gradually increases, the fingertips of the thumb 61 and the index finger 62 move slightly above the first picking surface 31a and the second picking surface 31b.

At the end of drawing, the operation is to draw an arc in the range of about 270 degrees to 360 degrees at the center angle of the arc shown in FIG. 4 (c). In order to rotate the writing tool 50 held by the finger, the rolling portion 32 is rolled from the fingertips of the thumb 61 and the index finger 62 over the entire finger pad to draw a completely circular circle.

Therefore, the compass operating body 30 described above applies different loads to the central leg 10 and the rotating leg 20 of the compass from the beginning to the end of drawing the arc, taking into consideration the ease of picking, the operating ability of the child, and the like. In addition to facilitating the drawing, it is possible to easily roll the operating body 30 between the fingertips of the thumb and the index finger toward the end of drawing the arc.

Next, the storage method of the writing tool storage mechanism of the compass described above will be described in detail with reference to FIGS. 5 and 6.

(Storage method)
The writing tool storage mechanism rotates the writing tool holder 40 and the writing tool 50 by approximately 180 degrees in the vertical direction from the state where the arc has been drawn with the compass, and positions the tip portion 51 of the writing tool 50 on the writing tool tip protection portion 24 of the holding portion 21b. .. At this time, the engaging protrusions 23, 23 formed on the opposite inner surfaces of the holding portion 21b and the engaging recesses 41b, 41b formed on the outer peripheral surface of the writing instrument holder 40 are engaged with each other, and the rotating leg The stored state in which the writing instrument is inverted on the center line of 20 is maintained.

After that, the central leg body 11 is closed so as to be housed in the storage portion 21a of the rotary leg 20. At this time, the needle 12 of the central leg 10 is hidden and protected by the needle protection portion 42a formed by bulging from the peripheral edge of the tightening portion 42 of the writing tool holder 40.

Therefore, the writing tool holding body 40 is rotated by the writing tool storage mechanism of the compass described above, and the tip portion of the writing tool 50 (the tip of the pencil in this embodiment) is held by the writing tool tip protection portion 24 of the holding portion 21b of the rotating leg 20. It is stored so as to be protected, and the needle 12 of the central leg 10 can be protected by the needle protection portion 42a of the writing tool holding body 40, and even if the writing tool 50 is fitted and held in the writing tool holding body 40, it is conventional. Compared to the compass, the entire compass (center leg 10, rotating leg 20, writing tool holder 40, writing tool 50) can be aligned and put together smaller, and the writing tool 50 can be fitted on a desk or the like when not in use temporarily. It is possible to safely place the tip of the writing tool 50 and the needle 12 of the central leg 10 in a protected state while being held together.

Although preferred embodiments of the present invention have been illustrated in the above embodiments, the present invention is not limited to the above embodiments, and improvements and changes can be made within the scope of the claims. For example, in the present embodiment, a writing instrument holder for holding a pencil is taken as an example, but a mechanical pencil or the like provided with a built-in core feeding mechanism may be held.

10 ... central leg, 11 ... central leg body, 11a ... thick part, 12 ... needle,
20 ... Rotating leg, 21 ... Rotating leg body, 21a ... Storage part, 21b ... Holding part, 22 ... Holding body shaft part, 23 ... Engaging convex part, 24 ... Writing tool tip protection part, 24a ... Receiver, 24b ... Cover Department,
30 ... Operating body, 31 ... Picking part, 31a ... First picking surface, 31b ... Second picking surface, 31c ... Third picking surface, 32 ... Rolling part, 33 ... Shaft, w ... Width, h ... Height , 34 ... Insertion part, 35 ... Corner part, 36a ... First plane area, 36b ... Second plane area, 36c ... Third plane area,
40 ... Writing tool holder, 41 ... Fitting holding part, 41a ... Bearing part, 41b ... Engagement recess, 42 ... Tightening part, 42a ... Needle protection part, 42b ... Opening part, 43 ... Tightening screw, 44 ... Protrusion,
50 ... Writing implements (pencil), 51 ... Tip (core tip),
61 ... thumb, 62 ... index finger, 63 ... middle finger,
X ... Opening and closing direction.

Claims (5)

A central leg having a needle at the tip, a writing tool holding body that holds a writing tool, a rotating leg that rotates the writing tool holding body around the central leg, and an operating body that pivotally supports the rotating leg and the central leg so as to open and close. Be prepared for
The rotating leg has a rotating leg main body and the writing tool holder provided at the tip of the rotating leg main body.
A compass characterized by having a writing instrument storage mechanism for storing the tip end portion of the writing instrument held by the writing instrument holding body in the rotating leg main body. The writing tool storage mechanism has a holding portion formed by bifurcating the tip of the rotating leg body and a holding body shaft portion for rotatably supporting the writing tool holding body on the opposite inner side surface of the holding portion. The compass according to claim 1, further comprising a writing tool tip protecting portion formed of a slit having an external shape of the tip portion of the writing tool in the vicinity of branching to the holding portion. The compass according to any one of claims 1 or 2, wherein the writing instrument holder has a needle protection portion formed by bulging so as to cover the entire needle of the central leg. The writing instrument tip protection portion is a pair of receiving pieces formed so as to project from the peripheral edge of the writing instrument tip protection portion that abuts on the writing instrument holder in a state where the tip portion of the writing instrument is directed in the same direction as the needle of the central leg and starts to draw an arc. The compass according to claim 2, wherein the compass is characterized by having. The rotating leg body has a hollow storage portion inside the rotating leg body so that the surface on the center leg body side is opened from the base end to the tip of the rotating leg body so that the central leg body can be stored. The compass according to claim 1, wherein the compass is characterized in that.

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