JP3203229B2 - Black board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blackboard in which corners of the blackboard are rounded by attaching a peripheral frame made of synthetic resin around the main body of the blackboard. The blackboard referred to here includes not only a whiteboard, but also a bulletin board, an information board, an exhibition panel, and the like.

[0002]

2. Description of the Related Art In recent years, the demand for blackboards having rounded corners has been increasing since they give a soft and good impression in appearance. Traditionally, this type of blackboard
The entire peripheral frame attached to the periphery of the blackboard body is integrally formed in a long shape with either hard synthetic resin or soft synthetic resin, and the peripheral frame is attached along the outer periphery of the blackboard body.

However, in the case of a peripheral frame made entirely of a hard synthetic resin, when one peripheral frame is made to follow the outer periphery of the main body of the blackboard, the peripheral frame is fitted to the rounded corner portion of the main body of the blackboard. Is difficult, and the installation work is extremely time-consuming. Further, in the circumferential frame made of soft Shitsugo synthetic resin,
Although it is very easy to fit the round part, when the peripheral frame is fixed to the blackboard body with a fixture such as a needle, the entire peripheral frame is soft, so the inner peripheral surface of the peripheral frame is the outer periphery of the blackboard main body. The peripheral frame is likely to be wavy due to, for example, partial lifting and the like.

FIG. 7 shows a conventional guide plate 1 used in various event venues and the like. The guide plate 1, as shown in (A) of FIG. 8, a groove 3 on the outer circumferential surface of the guide plate main body 2 and conditions set over the entire circumference, a circumferential frame 4 attached to the outer periphery of the main body 2 A peripheral frame main body 5 made of a soft synthetic resin, and a guide plate main body 2 protrudingly provided at the center in the width direction of the peripheral frame main body 5.
Fitting ridges 6 that fit into the concave grooves 3 of the pair, and engaging ridges that protrude from both ends in the width direction of the peripheral frame body 5 and are engaged with both ends in the width direction of the outer periphery of the guide plate body 2. 7, 7 are formed in a substantially mountain shape in cross section, so that the fitting ridge 6 of the peripheral frame 3 is fitted into the concave groove 3 on the outer peripheral surface of the guide plate main body 2, and both engaging ridges 7 are formed. , 7 are engaged with both ends of the outer periphery of the guide plate body 2,
The peripheral frame 3 is attached along the outer periphery of the guide plate main body 2, and is in an attached state as shown in FIG.

However, the peripheral frame 4 is connected to the guide plate main body 2.
It is difficult to fabricate the peripheral frame 4 and groove the outer periphery of the guide plate main body 2 when mounting on the outer periphery of the peripheral frame 4, and the fitting ridge 6 of the peripheral frame 4 is fitted with the concave groove 3 on the guide plate main body 2 side. If the engagement between the engaging ridges 7, 7 of the peripheral frame 4 and the outer peripheral portion of the guide plate main body 2 is slightly deviated, respectively, the fitting and engagement thereof cannot be performed, and partial rework is performed. Conversely, when the fitting or engagement is loose, rattling occurs in the portion of the peripheral frame 4, and when the fitting or the tightness of the engagement varies, the peripheral frame 4 There is a problem that a wave is easily formed.

However, even a relatively small one having a long side of at most about 1 m, such as the above-mentioned guide plate 1, has such a problem, but has a left and right length of 2 to 4 m. In the case of a large blackboard, this becomes a more serious problem, and the above structure cannot be adopted.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention makes it possible to fit the peripheral frame to the round portion of the corner of the blackboard main body, and to easily attach the peripheral frame to the outer periphery of the blackboard main body. It is an object to provide a blackboard that can be easily processed.

[0008]

The invention according to claim 1 is
In the blackboard 11 in which the corners 10 of the blackboard are rounded by attaching a synthetic resin peripheral frame 13 around the blackboard main body 12, the peripheral frame 13 includes:
The peripheral frame 1 is formed of a soft-hard composite resin in which an inner hard resin portion 14 and an outer soft resin portion 15 are integrally formed.
3. A groove 16 is formed in the soft resin portion 15 in the longitudinal direction thereof.
Then, the peripheral frame 13 is bound to the blackboard body 12 at the position of the concave groove 16.
It is fixed with a tie 18 and the groove 16 is shaped like a dovetail in cross section.
An elastic cord 19 is elastically engaged with the dovetail-shaped groove 16.
The groove is fitted to close the groove .

[0009]

[0010]

A second aspect of the present invention is the blackboard according to the first aspect , wherein the elastic cord-like body 19 is formed of a tube made of a soft resin.

According to a third aspect of the present invention, in the blackboard according to the first or second aspect , the soft resin portion 15 of the peripheral frame 13 is formed to be thick as a whole, and the hard resin portion 14 is formed to be thin as a whole. A decorative frame portion 17 that covers the periphery of the front surface of the blackboard main body 12 is formed integrally with the meat resin portion 15 in an L-shaped cross section.

According to a fourth aspect of the present invention, in the blackboard according to the first or second aspect , the soft resin portion 15 of the peripheral frame 13 is formed to be thick as a whole, and the hard resin portion 14 is formed to be thin as a whole. In the soft resin portion 15 of the peripheral frame, a thick portion 15a covering the edge of the blackboard main body 12, a front side decorative frame 15b covering the front surface thereof, and a rear side decorative frame 15c covering the rear surface thereof have a downward facing cross section. It is formed integrally in the shape of a letter.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a blackboard 11 according to the present invention, which is installed in a classroom or a meeting room of a school and has a width of 3600 mm to 4500 mm in the left-right direction and a height of 1200 mm. Is shown. Each corner of the blackboard 11 is formed in a round shape. FIG. 2 is a vertical sectional side view of the blackboard 11, and FIG. As can be seen from these figures, the blackboard 11 is attached to the blackboard main body 12 in which each corner 10 is formed in a round shape, and attached to the outer periphery of the blackboard main body 12.
The blackboard main body 12 includes a peripheral frame 13 which surrounds each corner 10 in a round shape. The blackboard main body 12 has a blackboard surface material 12c mounted on a front side of a main body frame 12a via a base material 12b, and a back plate 12d mounted on a back side of the main body frame 12a. Attached to the wall 9.

FIG. 4 shows a sectional structure of the peripheral frame 13. The peripheral frame 13 is made of a soft-hard composite resin in which an inner hard resin portion 14 and an outer soft resin portion 15 are integrally formed. A hard resin portion 14 and a soft resin portion 15
Are each made of a thermoplastic resin such as polyvinyl chloride (PVC). The peripheral frame 13 is wound on an appropriate winding drum before use, and is cut by a cutter for each required length before use.

In the soft resin portion 15 of the peripheral frame 13 formed of the above-mentioned soft-hard composite resin, a groove 16 having a dovetail cross section is formed in the outer peripheral surface thereof along the longitudinal direction. The soft resin portion 15 is formed to be thick as a whole, the hard resin portion 14 is formed to be thin as a whole, and the thick soft resin portion 15 is provided with a decorative frame portion 17 covering the front surface of the blackboard body 12. Are integrally formed in an L-shaped cross section.

The peripheral frame 13 having the above structure is attached to the blackboard main body 1.
2, the peripheral frame 13 wound on the winding drum as described above is cut into a predetermined length corresponding to the outer peripheral length of the blackboard body 12, and the peripheral frame 13 having the predetermined length is cut.
With the hard resin portion 14 facing inward and the decorative frame portion 17
With the side positioned on the front side of the blackboard main body 12, the hard resin portion 14 is brought into contact with the outer peripheral surface of the blackboard main body 12, and
The front end portion 17a of the decorative frame portion 17 is brought into contact with the front surface of the blackboard main body 12, as shown in FIG. The peripheral frame 13 has a front end 17a of a decorative frame 17 formed at one end of the peripheral frame 13 in contact with a front surface of the blackboard main body 12, and an end surface at the other end is a rear surface of the blackboard main body 12. The width is formed so as to be flush with the above.

As described above, the hard resin part 14 is
2. The soft resin portion 15 is brought into contact with the outer peripheral surface, and the front end portion 17a of the decorative frame portion 17 is brought into contact with the front surface of the blackboard main body 12.
The head of a binding tool driving machine (not shown) is inserted into the concave groove 16 on the side, and a U-shaped needle-shaped binding tool 18 is inserted from the bottom of the concave groove 16 into the blackboard body 12 through the hard resin portion 14. Driving is performed (see FIG. 4), and the peripheral frame 13 is stapled to the blackboard body 12. Then, the binding tool driving machine is moved to the groove 1
6, the entire peripheral frame 13 is uniformly fixed on the entire outer periphery of the blackboard main body 12 while being sequentially moved along the longitudinal direction of the blackboard 6. still,
Both end surfaces of the peripheral frame 13 are butted against each other so as to be in close contact with each other.

After the entire peripheral frame 13 is fixed to the outer periphery of the blackboard main body 12 in this manner, the elastic cords 19 are inserted into the groove 16 having a dovetail cross section.
Is engaged by utilizing its elasticity, and the opening 16a of the concave groove 16 is formed.
To close. The elastic cord-like body 19 is preferably made of a tube made of a thermoplastic resin such as polyvinyl chloride which is softer than the soft resin portion 15 of the peripheral frame 13,
When the tube 19 is engaged with the concave groove 16, as shown by a virtual line in FIG. 5, the concave groove 1 is compressed while the tube 19 is deformed at the opening 16 a having a width smaller than the depth of the groove.
When the tube 19 is pushed into the inside, the tube 19 returns to its original shape by elasticity inside the concave groove 16 and closes the opening 16a as shown by the solid line in FIG. The fitting of the peripheral frame 13 is completed by engaging the tube, that is, the elastic cord-like body 19 with the concave groove 16.

FIG. 6 shows another embodiment of the present invention. In the above embodiment, the soft resin portion 15 is integrally formed with a decorative frame portion 17 covering only the periphery of the front surface of the blackboard main body 12. However, in this embodiment, the thickened portion 15a that covers the edge of the blackboard main body 12 has a front side cosmetic that covers the front and rear peripheries of the blackboard main body 12 on both sides. The frame 15b and the rear face side decorative frame 15c are integrally formed.

As described above, the peripheral frame 13 of the blackboard 11
Is made of a soft-hard composite resin of an inner hard resin portion 14 and an outer soft resin portion 15, and only the inner portion of the peripheral frame 13 is a hard resin. There is no difficulty in bending at the corner 10 when making it conform to the corner 10. In particular, in the peripheral frame 13 of this embodiment, the bending operation of the peripheral frame 13 at the corner 10 is performed because the inner hard resin portion 14 is formed to be extremely thinner than the outer soft resin portion 15. Is very easy.

The inner portion of the peripheral frame 13 is the hard resin portion 1.
4, when the peripheral frame 13 is fixed to the outer periphery of the blackboard main body 12 with the binding tool 18, the binding tool 18 is hard resin portion 14.
The hard resin portion 14 can be firmly attached to the outer peripheral surface of the blackboard main body 12 because the hard resin portion 14 bites the hard resin portion 14 in a state where the hard resin portion 14 is pierced.

The groove 1 is formed in the soft resin portion 15 of the peripheral frame 13.
6 is formed, and a binding tool 18 is driven from the bottom surface of the concave groove 16 by a binding tool driving machine, so that the peripheral frame 13 is attached to the blackboard body 12.
, The effective driving length of the binding tool 18 into the blackboard body 12 can be made sufficiently long.
The peripheral frame 13 can be securely and firmly fixed to the blackboard main body 12.

Further, the groove 16 is formed in a dovetail shape, and the elastic string 19 is elastically engaged with the dovetail shape groove 16 so as to close the groove 16. It is possible to prevent intrusion of dust and the like into the interior, not to impair the appearance, and to prevent the elastic cord-like body 19 from coming off from the concave groove 16. In this case, if a tube made of a soft resin is used as the elastic cord-like body 19, the work of engaging with the concave groove 16 is easy, and the cost is low and it is economical.

As described above, the soft resin portion 15 of the peripheral frame 13 is formed to be thick as a whole, and the hard resin portion 14 is formed to be thin as a whole. Makeup frame 1 that covers the front of blackboard body 12
7 are integrally formed in an L-shaped cross section, the soft resin portion 1 is attached when the peripheral frame 13 is attached to the outer periphery of the blackboard body 12.
Since only 5 is exposed to the outside, the appearance of the outer frame 13 is good and the feel of the peripheral frame 13 is good, so that a user of the blackboard can be given a warm feeling.

In another embodiment, as described above, the thick portion 15a covering the edge of the blackboard main body 12 has a front surface covering the periphery of the front surface and the periphery of the rear surface of the blackboard body 12 on both side edges. Side makeup frame 15b and rear face makeup frame 15c
Is integrally formed, the peripheral frame 13 can be attached to the blackboard main body 12 such that the front and rear decorative frames 15b and 15c sandwich the periphery of the blackboard main body 12.

[0027]

According to the first aspect of the present invention, the peripheral frame of the blackboard is made of a soft-hard composite resin in which an inner hard resin portion and an outer soft resin portion are integrally formed. Since only the inner part is hard resin, when attaching the peripheral frame to the rounded corner of the blackboard main body when attaching the peripheral frame, the bending work at that corner can be easily performed, and through the inner hard resin part The peripheral frame can be securely fixed to the outer periphery of the blackboard main body. In particular, the present invention is effective for a large blackboard.

According to the first aspect of the present invention, a concave groove is formed in the soft resin portion of the peripheral frame in the longitudinal direction, and the peripheral frame is fixed to the main body of the blackboard with the binding tool at the position of the concave groove. This makes it easier to drive the binding tool into the blackboard body, and the effective length of the binding tool to the blackboard body can be made sufficiently long, so that the peripheral frame can be firmly fixed to the blackboard body. it can.

Further , according to the first aspect of the present invention, the groove is formed in a dovetail shape in cross section, and an elastic cord is elastically engaged with the dovetail shape groove so as to close the groove. Intrusion of dust and the like into the groove can be prevented, the appearance of the groove is not impaired, and there is no possibility that the elastic cord-like body is detached from the groove.

According to the second aspect of the present invention, by using a flexible resin tube made of a soft resin tube as the elastic cord-like body, the work of engaging with the concave groove is easy, and the cost is low and the economy is reduced. It is a target.

According to a third aspect of the present invention, the soft resin portion of the peripheral frame is formed to be thick as a whole, the hard resin portion is formed to be thin as a whole, and the thick resin portion covers the periphery of the front surface of the blackboard body. By integrally forming a decorative frame having an L-shaped cross section,
With the peripheral frame attached to the outer periphery of the blackboard main body, only the soft resin part is exposed to the outside, and in addition to good appearance, the peripheral frame has a good feel and gives a warm feeling to the user of the blackboard. be able to.

According to a fourth aspect of the present invention, a front side decorative frame and a rear side decorative frame which cover the periphery of the front side and the periphery of the rear side of the blackboard body on both side edges of the thick portion which covers the edge of the blackboard body. By integrally forming, as in the above-described embodiment, the appearance is good, the feel of the peripheral frame is good, and a warm feeling can be given to the user of the blackboard, and the front and rear sides can be further provided. Since the peripheral frame can be attached to the blackboard main body such that both decorative frames sandwich the periphery of the blackboard main body, the peripheral frame can be stably, accurately, and quickly attached to the blackboard main body.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire blackboard according to the present invention.

FIG. 2 is a vertical sectional side view of the blackboard.

FIG. 3 is a cross-sectional plan view of the blackboard.

FIG. 4 is an enlarged sectional view showing a sectional structure of a peripheral frame of the blackboard.

FIG. 5 is an explanatory sectional view showing a state in which a soft resin tube is engaged with a concave groove provided in a soft resin portion of a peripheral frame.

FIG. 6 is a cross-sectional view showing another embodiment of the present invention.

FIG. 7 is a front view showing a guide plate as a conventional example.

8A is an explanatory perspective view showing a state in which the peripheral frame of the guide plate is attached to the guide plate body, and FIG. 8B is an explanatory sectional view showing the peripheral frame attached to the guide plate body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Round corner part of blackboard 11 Blackboard 12 Blackboard main body 13 Peripheral frame 14 Hard resin part 15 Soft resin part 15a Thick part 15b Front face decorative frame 15c Rear face decorative frame 16 Depressed groove 17 Makeup frame part 18 Strap 19 Elasticity String (Soft resin tube)

Continuation of the front page (56) References JP-A-7-67725 (JP, A) JP-A-60-86143 (JP, U) JP-A-3-98636 (JP, U) JP-A-45-29851 (JP , Y1) Jikken 48-12302 (JP, Y1) Jikken 49-5465 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B43L 1/04 A47B 13/08 A47B 96/20 B27M 1/08

Claims (4)

(57) [Claims] 1. A blackboard wherein a corner portion of the blackboard is rounded by attaching a synthetic resin peripheral frame around the blackboard body, wherein the peripheral frame is formed of an inner hard resin portion and an outer hard resin portion. Is formed of a soft-hard composite resin integrally formed with the soft resin portion of
A groove is formed in the longitudinal direction, and the peripheral frame is black at the position of this groove.
It is fixed to the plate body with a binding tool, and the concave groove has a dovetail shape in cross section.
Is formed, and an elastic cord is elastically engaged with the dovetail-shaped groove.
A blackboard that fills the groove . 2. The blackboard according to claim 1 , wherein the elastic cord-like body is formed of a tube made of a soft resin. 3. The soft resin portion of the peripheral frame is formed to be thick as a whole, and the hard resin portion is formed to be thin as a whole.
3. The blackboard according to claim 1, wherein a decorative frame for covering the periphery of the front surface of the blackboard body is formed integrally with the thick resin portion in an L-shaped cross section. 4. The soft resin portion of the peripheral frame is formed to be thick as a whole, and the hard resin portion is formed to be thin as a whole,
In the soft resin portion of the peripheral frame, a thick portion covering the edge of the blackboard main body, a front face decorative frame covering the front surface periphery, and a rear face decorative frame covering the rear surface periphery are integrally formed in a downward U-shaped cross section. The blackboard according to claim 1 or 2 , which is formed.