JPS60236871A - Circular frame and manufacturing method thereof - Google Patents

Abstract

PURPOSE:To make a joint so as not to appear on a laminated surface, by forming a circular frame in a way of cutting the ring-shaped base body rolled on so as to cause each end side of laminated tapelike plate materials to come out on both inner and outer circumferential surfaces. CONSTITUTION:A ring-shaped base body 10 is rolled on so as to cause each end side of laminated tapelike plate materials in the proper number of sheets to come out on both inner and outer circumferential surfaces, and formed into cohesion with an adhesive agent. With cutting operations for the ring-shaped base body 10 like this, a circular frame is formed up. In the case where the circular frame is to be required for mechanical strength such as a car steering wheel, the machined circular frame is halved and then a metal core is inserted into the inside.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is applicable to products such as automobile handles, chair frames, interior decorations, etc., which are formed by winding and laminating tape-like plate materials and cutting them. The present invention relates to a circular frame and a method for manufacturing the same.

(B) Prior Art Conventionally, circular frames such as car steering wheels were made by scarfing the ends of multiple short tape-like plates (cut diagonally), making the scarf parts face each other, and then high-frequency gluing. It is formed by winding a long plate material obtained by joining together on a circumference of a predetermined diameter to form a ring-shaped base body, and cutting this ring-shaped base body.

However, as shown in FIG. 1, in the conventional circular frame, holes 3 remain when the scarf portion 2 of the tape-like plate l is joined, and the holes 3 are removed after the manufacturing process. This has to be compensated for by sawdust and glue, which has the disadvantage of not only being unsightly but also requiring additional time in the manufacturing process.

In addition, since this joint is generally weak, it has the disadvantage that it is easily broken during the winding of the plate material or when the product is made into a circular frame.

(c) Purpose This invention can be manufactured in a short time and has no seams (gap) on the laminated surface.
To provide a circular frame and a method for manufacturing the same, which can manufacture a durable circular frame without any appearance.

(D) Structure The circular frame according to the first invention includes an appropriate number of laminated tape-like plates that are wound so that the edges thereof appear on the inner circumferential surface and the outer circumferential surface;
It is characterized by being formed by cutting a fixed annular base.

Further, in the method for manufacturing a circular frame according to the second invention, an appropriate number of tape-shaped plates having approximately equal lengths coated with adhesive in advance are laminated one after another at predetermined intervals in the longitudinal direction, and Each plate is wound around a drum with the laminated side facing inside so that the inner and outer circumferential surfaces are exposed, and each plate is dried with a tightening tool attached around the wound plate. The method is characterized in that a circular frame is formed by cutting the ring-shaped base body that is fixed and thus imprinted.

(E) Embodiment FIG. 2 is an external perspective view showing the annular base 10 used for manufacturing the circular frame according to the first invention.

In the figure, reference numeral 11 is a tape-shaped plate material formed from a single plate such as beech. The annular base IO is formed by winding an appropriate number of laminated tape-like plates 11 so that their edges appear on the inner and outer circumferential surfaces, respectively, and fixing them with an adhesive or the like. Note that both ends of the plate material 11 are formed thinner toward the tip. Reference numeral 12 denotes the edge of the tape-shaped plate material 11 appearing on the inner and outer circumferential surfaces.

A circular frame is formed by cutting the annular base 10. FIG. 3 shows a perspective view of an automobile steering wheel using a circular frame. In the figure, 20 is a circular frame formed from the above-described annular base 10, and 30 is a metal spoke. In the case of a circular frame that requires mechanical strength, such as an automobile steering wheel, the cut circular frame is divided into two parts, and a metal core is inserted inside.

Next, a method for manufacturing a circular frame according to the second invention will be described.

4 to 6 are explanatory diagrams showing an embodiment of the method for manufacturing a circular frame according to the second invention.

For example, seven tape-like plates 11 of approximately equal length are coated with a urea-based or phenol-based adhesive in advance, and laminated one after another at predetermined intervals in the longitudinal direction. However, as shown in Fig. 4, the laminated plates 11 were fitted with a thick-walled iron inner ring 33 (not shown) with the laminated surface facing inside so that the edges of the plates appeared on the inner peripheral surface. It is wound around the drum 31. At this time, the plate jlA11 is fed to the drum 31 while being pressurized from the l'I' side by a feeding mechanism (not shown), and is further pressed by a plurality of rollers 32 provided along the circumferential surface of the drum 31. It is rolled up while being pressed.

In order to prevent the edge of the plate material on the outer periphery of the rolled Jflf 11 from peeling off, the surrounding area is tightened (1 tightened with the fastener 34). Board material 11
It shows. In the same figure, 33 is the aforementioned inner ring;
4 is a thin iron fastener.

In this way, the rolled plate material 11, with the inner ring 33 attached to the inner circumferential surface and the fastener 34 attached to the outer circumferential surface, is, for example! The plate material 11 is heated at 0.00"C for 1 hour. At this time, as shown in FIG. 6, the inner ring 33 expands outward, so the plate 11 is pressurized by the inner ring 33 and the tightening tool 34. Under pressure, the adhesive between the plates 11 is cured.

After curing is completed, the inner ring 33 contracts as the temperature decreases,
Since its diameter is reduced, the inner ring 33 can be easily separated from the plate 11. When the tightening tool 34 is removed, the annular base body 10 shown in FIG. 2 is obtained.

A circular frame is formed by cutting the annular base 10 obtained in this manner.

(f) Effects In the circular frame according to the first invention, the edges of the plates do not appear inside the annular base, so no gaps are formed at the joints of the plates unlike in conventional circular frames. Further, according to the present invention, a regular annual ring-like pattern appears on the surface of the circular frame. Therefore, according to the present invention, the appearance of the circular frame can be beautifully finished.

In addition, this invention joins board materials into one piece like conventional products]
Since it is not a type of material, it may break at the joint ′ψ during winding of the plate material.
It is very easy to manufacture as there is no need for 12 steps. Furthermore, for the same reason, the strength of this circular frame can be improved as a product.

On the other hand, the method for manufacturing a circular frame according to the second invention uses a ring-shaped base obtained by winding plate materials laminated in advance to form a circular frame. A circular frame can be manufactured in a short time compared to a conventional method for manufacturing a circular frame using the obtained ring-shaped substrate.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional circular frame, Fig. 2 is a perspective view showing a ring-shaped base used in the circular frame according to the first invention, and Fig. 3 is an automobile using the circular frame according to the first invention. The perspective view of the handle and FIGS. 4 to 6 are explanatory diagrams showing an embodiment of the method for manufacturing a circular frame according to the second invention. DESCRIPTION OF SYMBOLS 10... Ring-shaped substrate, 11... Tape-shaped plate material, 12.
...Edge, 20...Circular frame. Patent applicant Morio Arai Attorney Patent attorney Takaharu Ohnishi Figure 6 13゜

Claims (2)

[Claims] (1) A circular frame characterized in that it is formed by cutting a ring-shaped base formed by winding and fixing an appropriate number of laminated tape-like plates so that their edges appear on the inner and outer peripheral surfaces. (2) An appropriate number of tape-like plates of approximately equal length, coated with adhesive in advance, are laminated one after another at predetermined intervals in the longitudinal direction, and are stacked so that the edges of the plates appear on the inner and outer circumferential surfaces. Each plate is wound around a drum with the surface facing inside, and a tightening tool is attached to the circumference of the wound plate and dried to fix each plate.The resulting ring-shaped base is cut into a circular shape. A method for manufacturing a circular frame, the method comprising forming a frame.