JP3040199U - Lightweight blackboard - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a lightweight blackboard which can be adsorbed and held on a large steel blackboard, is easy to handle, and is highly safe. SOLUTION: This lightweight blackboard is such that a frame part 2 made of a soft material is fitted around a blackboard main body 1 formed by applying a blackboard paint on the surface of a flat plate made of a low-foam synthetic resin, and long and narrow boards are provided above and below the blackboard main body. Plastic magnets 3 and 3 are attached. Since this lightweight blackboard uses a flat plate made of low-foam synthetic resin for the blackboard body, it is not only extremely lightweight and easy to transport and handle, but it is also attracted to and held by a large steel blackboard with a magnet. Therefore, it can be easily used as an auxiliary blackboard.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to an auxiliary blackboard that is magnetically attracted to a large blackboard for use as an auxiliary for a large blackboard used for classrooms or offices, and in particular, for facilitating carrying and handling. About a lightweight blackboard.

[0002]

[Prior art]

 An auxiliary blackboard of this type is usually constructed by applying blackboard paint to both sides of a steel flat plate, with the edges of aluminum, plastic, rubber, etc. appropriately attached to the periphery of the blackboard body. There is. The auxiliary blackboard has blank maps, ruled lines, etc., which are selected according to the purpose of use and leaned in front of a large blackboard or hung with a string.

[0003]

[Problems to be solved by the device]

 Since the main body of the above-mentioned conventionally known auxiliary blackboard is made of steel, it is heavy, and even if it is attached to a large blackboard by using a magnet or the like, it is not impossible except for a very small one. However, its heavy weight makes it inconvenient to handle and has the drawback of injuring the human body when dropped.

An object of the present invention is to provide a lightweight auxiliary black plate that is lightweight, easy to handle, and safe, except for the above drawbacks.

[0005]

[Means for Solving the Problems]

 The lightweight blackboard of the present invention comprises a blackboard main body formed by applying a blackboard paint to a flat plate made of low-foam synthetic resin, an elongated plate-like plastic magnet attached to at least a part of the periphery of the blackboard main body, and the above blackboard. It is characterized by comprising a frame portion of a soft material fitted around the main body.

The blackboard body is constructed by applying a blackboard paint to a rectangular flat plate made of low-foam synthetic resin. A flat plate made of low-foam synthetic resin is a plate made by molding a synthetic resin such as polystyrene resin into a low-foam form. In particular, for blackboard, a product having an expansion ratio of about 1.5 to 3 times, especially a product having a standard expansion ratio of about 2 times is preferable in terms of high surface smoothness, strength, toughness and weight.

Blackboard paints are usually made by adding pigments such as lead chromate, cyanine blue, talc, and barium sulfate, organic solvents, and auxiliaries to synthetic resins such as alkyd resins, urethane resins, and acrylic resins. Stuff used. Since the blackboard body is made of low-foam synthetic resin, it is extremely light and can be easily attracted and held on a large steel blackboard by the elongated plate-shaped plastic magnets attached around the blackboard body.

The plate-shaped plastic magnets may be provided around the entire circumference of the blackboard body, but it is usually sufficient to provide one plate magnet on each side of the blackboard. In the case of a blackboard for double-sided use, use four plate-shaped plastic magnets, one on each of the upper and lower sides.

The frame portion protects the blackboard main body and at the same time facilitates the holding and transportation of the blackboard. It is made of an elastic soft material such as plastic or hard rubber, and is formed inside for fitting. Insert the blackboard body into the groove and fix it.

[0010]

【Example】

 FIG. 1 shows the entire lightweight blackboard of the present invention, in which a frame portion 2 made of plastic or hard rubber is attached around a blackboard body 1 made of low-foam synthetic resin. On the top and bottom of the display surface of the blackboard body 1, elongated plate-shaped plastic magnets 3, 3 are attached.

As shown in FIG. 2, the blackboard body 1 is constructed by applying a blackboard coating material 12 to both surfaces of a flat plate 11 made of low-foam synthetic resin. The periphery of the blackboard body 1 is fitted into a groove 21 provided on the inner surface of the frame portion 2. The plate-shaped plastic magnets 3 and 3 attached to both front and back sides are joined to the surface of the flat plate 11 through interposing members 4 and 4 made of appropriate materials in order to eliminate a step with the frame portion 2.

[0012]

[Effect of the invention]

 Since the lightweight blackboard of the present invention uses a flat plate made of low-foam synthetic resin for the main body, the weight of the entire black plate can be reduced, and it is easy to carry and handle. Also, because it is lightweight, it can be adsorbed and held and fixed to any place on a large steel blackboard with a plate-shaped plastic magnet, so it can be easily used as an auxiliary black plate in classrooms and offices. Can be used. By the way, the weight of a 900 cm x 1200 cm steel blackboard is usually 4.5 kg, whereas the lightweight blackboard of the present invention of the same size is 2.2 kg, which is less than half the weight.

Since the flat plate made of low-foam synthetic resin has a smooth surface and has a good paste of the blackboard paint, a smooth painted surface can be easily formed by a room temperature coating process. As a result, the manufacturing cost of the blackboard can be reduced.

Since the elongated plate-shaped plastic magnet is attached to at least a part of the periphery of the blackboard body, the blackboard can be easily adsorbed and held on a large steel blackboard.

Since the frame portion made of a soft material is fitted around the blackboard body, it is easy to handle the blackboard and ensure safety to the human body even if the blackboard is accidentally dropped. You can

[Brief description of the drawings]

FIG. 1 is a plan view of a lightweight blackboard according to an embodiment.

FIG. 2 shows a partial cross-sectional view of a lightweight blackboard.

[Explanation of symbols]

 1 Blackboard body 2 Frame part 3 Plastic magnet 4 Insert material 11 Foamed vinyl chloride 12 Blackboard paint

Claims (1)

[Utility model registration claims] 1. A blackboard main body made by applying a blackboard paint to a flat plate made of low-foam synthetic resin, an elongated plate-shaped plastic magnet attached to at least a part of the periphery of the blackboard main body, and a periphery of the blackboard main body. A lightweight blackboard characterized by comprising a frame portion of a soft material embedded.