JPH0347910Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention relates to the technology of blackboards in movable partitions, particularly the technology of screen-like movable blackboards, and includes the technology of chalk powder receiving plates, the technology of folding them, and the use of magnets. Related to adhesive technology.

BACKGROUND ART Conventionally, a blackboard in a movable partition is fixed between studs and used as a functional panel used in the same way as a wall panel (hereinafter referred to as a panel) of a movable partition, or can be moved anywhere in front of the panel. Furthermore, it is used as a screen-like blackboard that can be rotated freely and used on both the front and back sides.

Due to the restrictions and characteristics of a movable partition, the blackboard as a panel or screen is required to have as few outward protrusions as possible from the upright.
On a blackboard, the protrusion of the chalk powder receiving plate corresponds to this outward protrusion.

That is, if the chalk powder receiving plate protrudes, the convenience of storage and deployment, which is a necessary condition or feature of a movable partition, will be lost.

Moreover, movable partitions have the characteristic of making the living or activity space as wide as possible and can be freely provided, but the protrusion of the chalk powder receiving plate goes against this requirement.

For example, in schools, assembly halls, etc. where many people gather and move, the protrusion of the chalk powder receiving plate can pinch or make the activity space inconvenient, resulting in injuries and property damage due to collisions. be.

Therefore, the chalk powder receiving plate of the blackboard of a movable partition panel or screen has been folded toward the blackboard side so that it does not protrude outward when the blackboard is not in use.

In this case, the chalk powder receiving board is folded toward the blackboard using a blackboard hinge that connects the hinge part at the bottom of the blackboard and the hinge strip part of the chalk powder receiving body. A method of fixing to a fitting and locking portion provided in a holder has been used, but recently a simple method using a magnet has been used frequently for this fixing method.

The present invention also relates to a method in which a metal plate is provided on a metal blackboard or a locking portion of the blackboard, and is fixed by attraction of a magnet attached to a chalk powder receiving plate.

According to the method of magnetic adhesion using magnets, there is no need for special structures such as the above-mentioned fitting and locking parts on the blackboard, and it is possible to simply attach the magnet to the chalk powder receiving plate.
It can be folded tightly onto a blackboard with great ease.

However, many drawbacks and difficulties in this method are now being pointed out.

That is, first, permanent magnets with a wide attraction surface are used to ensure secure fixation. The strong magnetism of the magnet magnetizes the blackboard, which is a ferromagnetic board, and causes the chalk powder receiving board to adhere almost instantly. The bond is so strong that even if you try to pull it apart, you won't be able to do it easily. Also, because the adhesive is applied from the point where the magnet approaches, the folded point of the chalk powder receiving plate may be slightly misaligned. Friction scratches on blackboards, etc., occur due to pulling apart.

If chalk powder has accumulated on the hinge part or if a heat-melting vinyl sheet or the like is sandwiched between the hinge part and the blackboard, it may become even more difficult to separate the hinge part. Generally, the chalk powder receiving plate has no protrusions or sharp edges, and the butterfly part has a gently curved surface. It becomes even more nerve-wracking to separate the receiver.

In view of this difficulty in separating, no projecting handle is attached to the front receiving strip of the chalk powder receiving plate. This is because it becomes a nuisance when used. Also, no effort has been made to make the handle foldable. The mechanism becomes complicated,
This is because manufacturing costs are also high.

In addition, according to the conventional method, since a permanent magnet is used with a wide adhesion surface exposed, magnetic objects that come into contact with it, such as cash cards and commuter passes that have magnetic recording, or the movement of the hands of a watch, may be affected by lines of magnetic force. There is a risk of being affected.

Furthermore, permanent magnets with large attraction surfaces are expensive.

As described above, there are several inadequacies in the conventional method of folding the chalk powder receiving plate using magnets, and this study aims to improve this using a new method and to develop the method described above. This has the effect of resolving various difficulties.

DISCLOSURE OF THE INVENTION The present invention does not directly magnetically adhere the attracting surface of a permanent magnet to a blackboard, etc., but houses a assembled magnet body in a box made of a non-magnetic material such as synthetic resin. A permanent magnet is sandwiched between ferromagnetic adsorption pieces, and the integrated adsorption protrusion that protrudes slightly from the top of the adsorption iron piece is pulled through an adsorption hole opened in the top surface of the box without protruding. It is supposed to be attached while looking into the closed state. The magnetic flux of the permanent magnet completes the magnetic path through the attracting iron piece, the attracting protrusion exposed in the attracting hole, and then to the ferromagnetic material of the blackboard, and when the chalk powder receiving plate is in the correct position,
I decided to touch it softly to the blackboard.

In addition, the box body can be easily attached to both ends of the chalk powder receiving plate, which is made of a non-magnetic material such as aluminum, by fitting, etc., and the box body is provided with a handle that can be pulled up by hooking a finger, etc. In addition, a dust removal opening is integrally provided to facilitate the removal of the chalk powder receiving plate and the removal of chalk powder.

BEST MODE FOR CARRYING OUT THE INVENTION In order to explain the present invention in more detail, examples will be described below with reference to the accompanying drawings.

Figure 1 shows a folding tool 1 using the magnet of the present invention.
(hereinafter referred to as folding tool 1) and a chalk powder receiving plate 2 to which this is attached are shown.

As shown in FIGS. 1 and 2, the folding tool 1 is mainly composed of an elongated box 3 with a downward opening and made of a non-magnetic material such as synthetic resin.

The box body 3 is a casing that houses the magnet,
From the bottom surface 5 of one end 4 in the longitudinal direction, a flat powder removal opening 6 projects outward at right angles and flush. The overall length in the longitudinal direction of the box body 3 and the powder removal opening 6 is the depth and width of the chalk powder receiving plate 2. Furthermore, a fitting protrusion 8 is provided on one side of the dust removal opening 6 and from the other end 7 in the longitudinal direction of the box body 3, each of which protrudes outward in a small manner at a right angle. The fitting protrusions 8, 8 are connected to the hinge strip 9 of the chalk powder receiving plate 2 and the end opening 11 of the front receiving strip 10,
11, respectively.

Also, the center part of the bottom part 5 of the box body 3 is shallowly notched to the depth of the chalk powder receiving plate 2 to form a connecting notch part 1.
Set it to 2. The connecting notch 12 is connected to the chalk powder receiving plate 2.
This is the location where the connecting piece 13, which is formed in a small width protruding state outward from the end of the central part sandwiched between the hinge strip 9 and the front receiving part 10, is fitted and joined flush.

Furthermore, a handle 14, which is a protruding part on which a finger or the like can be hung and pulled up, is formed at the other end of the box 3 in the longitudinal direction.

As shown in the figure, the outer surface or corner portions of the box 3 except for the bottom surface 5 may be formed into gently curved surfaces.

Furthermore, three suction strip holes 16, 16, 16, which are elongated rectangular through holes, are provided on the upper surface portion 15 of the box body 3 at equal intervals across the center strip.

Next, the assembled magnet 17, which is assembled into the inside of the box 3 from the bottom surface 5, is shown in FIGS. 3 and 4. That is, two flat small rectangular parallelepiped permanent magnets 18, 18 having approximately the same length as the attracting strip hole 16 are attracted to three flat small rectangular parallelepiped ferromagnetic plates that are slightly longer. Iron piece 19,
As shown in the figure, the adsorption iron piece 19 has adsorption protrusions 20, 20, 20 that protrude slightly upward at the length of the adsorption hole 16 at the part of the permanent magnet 18. It is formed in one piece.

The above is the assembled magnet body 17.

The assembled magnet body 17 is assembled and fixed inside the box body 3, as shown in FIG. That is, the suction protrusions 20, 20, 20 of the assembled magnet body 17 are attached to the box body 3.
Insert it into the suction strip hole 16. In this fitting, the suction protrusion 20 is attached to the top surface 1 of the box body 3.
5, it can be mounted in a slightly retracted state, flush with the upper surface part 15, or without protruding from it.

The above is the folding tool 1 of the present invention.

The chalk powder receiving plate 2 is made of a non-magnetic material such as aluminum, and is made of chalk or chalk with a hinge strip 9 that forms a hinge part 22 with a blackboard 21 made of a ferromagnetic material (iron plate in the embodiment). Connecting pieces 13, 13 are provided at both ends, each projecting a small width outward from the central end sandwiched by the front receiving strip 10, which serves as a front stop for powder. The circular opening in the connecting piece 13 shown in FIG. 1 is a screw hole 23. The ferromagnetic plate may be a part of the blackboard 21 instead of the entire surface.

In order to attach the folding tool 1 of the present invention to the chalk powder receiving plate 2, the connecting piece 13 of the chalk powder receiving plate 2 is fitted into the connecting notch 12 in the bottom part 5 of the box body 3, and secured with screws. At the same time, the fitting protrusion 8,
8 into the hinge strip 9 of the chalk powder receiving plate 2 and the end openings 11, 11 of the front receiving strip 10, the installation is completed.

Then, when the chalk powder receiver 2 used in a state perpendicular to the blackboard 21 is folded toward the blackboard 21, the magnetic flux of the permanent magnet 18 in the folding tool 1 is
A magnetic path is completed between the adsorption iron piece 19, the adsorption protrusion 20 exposed in the adsorption hole 16, and the ferromagnetic material of the blackboard 21, resulting in a tight adsorption state.
In other words, it is folded and fixed.

In this fixing, the magnetic flux of the permanent magnet 18 is not arbitrarily adhered by a wide attracting surface as in the conventional example, but is regulated by the box body 3 made of a non-magnetic material. Further, the magnetic adhesion is made soft by the weakly soft synthetic resin material as in the embodiment, and it is characterized in that the suction strips 16 and the suction protrusions 20 provide suction at the correct position.

In the present invention, the drawbacks of the conventional permanent magnet 18, which had the disadvantage of having a wide attracting surface and being expensive, are solved by using the attracting iron piece 19 made of a strong magnetic plate, and it is firmly fixed by attracting. In order to separate the chalk powder receiving plate 2 from the blackboard 21, a non-magnetic box 3 (adsorption holes 1) is placed in the magnetic path of the permanent magnet 18.
6) and the handle 1 that helps the user to pull it up with fingers etc. without providing any protruding objects on the box body 3.
4, this can be easily done and does not leave friction marks on the blackboard 21 as in the conventional example.

In addition, substances that need to be treated, such as chalk powder, can be removed from the powder removal port 6 of the present invention, and no trouble will occur due to the residue of substances that need to be treated.

The present invention is a unique invention that can be easily attached to a panel or screen-like blackboard 21 without requiring any special or complicated devices, and eliminates all the difficulties of conventional methods.

Industrial Applicability The folding tool 1 of the present invention is not only widely used as a chalk powder receiving plate 2 of a blackboard, but also, for example,
It is also used for shelf board devices for movable partitions, and has extremely high industrial applicability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the relationship with a chalk powder receiving plate 2 according to an embodiment of the present invention, and FIG.
FIG. 3 is a plan view of the folding tool 1 seen from above, and FIG.
FIG. 4 is a perspective view of the assembled magnet body 17, and FIG. 5 is an explanatory view showing the chalk powder receiving plate 2 in use and folded on the blackboard 21. Code, 1: Folding tool, 2: Chalk powder receiving plate, 3:
Box body, 5: Bottom part, 6: Dust removal opening part, 8: Fitting protrusion part, 9: Hinge strip part, 10: Front receiving strip part, 11:
End opening, 12: Connection notch, 13: Connection piece, 1
4: Handle, 15: Top part, 16: Adsorption hole, 1
7: assembled magnet body, 18: permanent magnet, 19: adsorption iron piece, 20: adsorption protrusion, 21: blackboard.

Claims (1)

[Scope of claim for utility model registration] Used at both ends of a chalk powder receiving plate made of a non-magnetic material such as aluminum, which is attached to a blackboard made of a ferromagnetic material or a part of which the material is attached. In a slender box body with a downward opening made of a non-magnetic material such as synthetic resin, a flat powder removal opening protrudes at right angles from the bottom surface of one longitudinal end of the box. The overall length in the longitudinal direction of the body and the powder collecting port is the depth width of the chalk powder receiving plate, and from the end of the powder collecting port and the other end in the longitudinal direction of the box body, the chalk powder receiving plate is The fitting protrusion that fits into the end of the hinge strip and the front receiving strip of the board protrudes outward at right angles to one side, and the center of the bottom of the box is the depth of the thickness of the chalk powder receiving plate. A shallow notch is made in the top of the chalk powder receiving plate, and a connecting piece is formed to protrude a small width outward from the end of the central part sandwiched between the hinge strip and the front receiving strip of the chalk powder receiving plate, and is fitted and joined flush. a connecting notch, and toward the other end of the box in the longitudinal direction,
A handle is formed as a concave part that can be held by fingers, etc., or the outer surface or corners of the box body except the bottom part are formed into a gently curved surface, and a central strip is sandwiched between the top surface of the box body. Three thin rectangular through-holes are provided at equal intervals, and two flat small rectangular permanent magnets with approximately the same length as the adsorption holes are inserted into three permanent magnets that are slightly longer than the adsorption holes. , similarly sandwiched between flat, small straight ferromagnetic plates of adsorption iron pieces,
The adsorbing iron piece is integrally equipped with a permanent magnet,
A assembled magnet is provided with a suction protrusion that slightly protrudes from the top by the length of the suction strip, and the assembled magnet is fitted into the suction strip from the inside of the box. , a folding tool using a magnet for a chalk powder receiving plate, which is attached flush to the top of the box or slightly retracted so as not to protrude.