JPS591869B2 - Manufacturing method for expanding and contracting butt rolls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a butt wrapper that can be expanded and contracted according to the size of the main opening of a member such as a raft to be attached. The central part of the front surface is recessed leaving the 4th circumference part so that the cross section of the 4th circumference part of the box body 1 becomes the groove-shaped cross section of the rear opening as the head plate element part 2, and the upper and lower parts of this 4th circumference part are made. , each center part 3 of the left and right parts is 4
A metal plate is press-formed to have a smaller diameter than the four corner parts of the peripheral part so that each center part 3 and each corner part 4 of the four peripheral parts are continuous at a step part 5, and then the outer periphery of the end plate base part 2 is is cut to form the end plate 6, and each piece of the four circumferential parts is cut at one of the two step portions 5 to form four L-shaped members 1. The small diameter portion 8 at the end of the L-shaped member 7 is fitted into the adjacent L-shaped member T in a frame shape, and the L-shaped member T is used to frame the frame. The specified invention is a method for manufacturing an expandable butt end wrapper characterized by arranging a mirror plate 6 at the top of the body. 2, the cross-sectional shape of the four circumferential parts of the box body 1 is made to be a groove-shaped cross section with a rear opening, and the center parts 3 of the upper, lower, left and right parts of these four circumferential parts are made smaller in diameter than the four corner parts. Each center part of the four circumferential parts and each corner part 4 are integrally molded with synthetic resin so that they are continuous at a step part 5, and then the outer periphery of the end plate base part 2 is cut to form the end plate 6, In addition, each piece of the four circumferential portions is cut at one of the two step portions 5 to form four L-shaped members □, and then four L-shaped members T are used to form a frame. The small diameter portion 8 at the end of the L-shaped portion 417 is slidably fitted into the adjacent L-shaped member 7, and the mirror plate 6 is placed inside the frame framed by the L-shaped member 7. This invention relates to a method for manufacturing a expanding and contracting butt end wrapper, which is a combined invention.

Conventionally, expanding and contracting end windings were made by bending metal pieces as shown in FIG. 1 to form an L-shaped member r, and combining four pieces of this with a separately formed mirror plate 6''.

However, in this conventional example, when the L-shaped member 7' is made by bending the metal pieces, one of the overlapping pieces 1
There is a problem that the cut edge of 0' remains free and this part turns over, causing injury during construction, and even after construction, if the overlapping piece 10' turns over, it becomes unsightly. Ta. Furthermore, when bending the metal piece, it was difficult to finish the corner portion of the L-shaped member 7' into a beautiful rounded shape. The present invention was invented in view of the above-mentioned conventional drawbacks, and its purpose is to cut a press-molded metal plate in the specific invention and to cut an integrally molded synthetic resin plate in the combined invention. to form four L-shaped members and one end plate, and fit the small diameter portion of the end of the L-shaped member into the adjacent L-shaped member so as to be able to slide freely.
By arranging the mirror plate inside a frame made of shaped members, it is possible to form a butt end wrapper that can be easily expanded and contracted.Moreover, since the entire body is press-molded in advance or integrally molded with synthetic resin, there is no wastage of materials. In addition, there is no need for overlapping pieces in the corner members as in the past, so there is no risk of the overlapping pieces turning over, and it is also possible to finish the corners of the corner members in a rounded shape. To provide a manufacturing method for expanding and contracting butt wrappers that does not give any strange feeling when assembled, since each block is made and assembled.

The present invention will be explained in detail below with reference to Examples. In the present invention, first, a metal plate such as a copper plate or a copper plated plate is press-formed to integrally form a box 1 as shown in FIG. The box body 1, which is integrally molded from this metal plate by breath molding, is open at the back and has a mirror plate base part 2 with a concave central part on the front, leaving the four circumferential parts; By forming the element part 2, the cross-sectional shape of the four circumferential parts of the box body 1 becomes a groove-shaped cross section with a rear opening, and the central parts 3 of the upper, lower, left and right parts of these four circumferential parts are The diameter is smaller than the four corner portions of the circumferential portion, and each central portion 3 and each corner portion 4 of the four circumferential portions are continuous at a stepped portion 5. Here, the depth of the stepped portion 5 is assumed to be approximately equal to the wall thickness of the box body 1. Further, in the above specific invention, the T-box 1 is integrally molded by press molding a metal plate, but in the combined invention, the box 1 is integrally molded from synthetic resin. In this way, the box 1 is made by integral molding, and in either method, various patterns are applied to the box 1 at the time of molding. The box 1 obtained as described above is then cut at the outer periphery of the end plate element 2 to form the end plate 6.
Further, in each piece of the four circumferential portions, four L-shaped members 7 are formed by cutting at one of the two step portions 5 on the back side. FIG. 3 shows a state in which the box 1 is cut to form one end plate 6 and four L-shaped members 7. Here, two steps 5 are formed on each piece of the four circumferential parts of the box body 1.
Since the L-shaped member 7 is obtained by cutting at one of the step portions 5,
A small diameter portion 8 (corresponding to the small diameter central portion of the four circumferential portions of the box body 1) is present at one end of the L-shaped member 7.
At this time, depending on the cutting method, the L
There are cases where the L-shaped member 7 has small-diameter portions 8 at both ends, and the L-shaped member 7 does not have small-diameter portions 8 at both ends, but in this case as well, the frame can be expanded and contracted. Thus, the four L-shaped members 7 were framed into a frame shape, and the small diameter portion 8 at the end of the L-shaped member 7 was slidably fitted into the adjacent L-shaped member 7, and the L-shaped members 7 were framed together. The mirror plate 6 is placed inside the object and expanded and contracted to form the end winding A. In this case, the surface peripheral portion of the mirror plate 6 is placed against the back of the short side piece 7a of each L-shaped member 7 having a groove-shaped cross section with a rear opening. FIG. 4 shows the expandable butt end wrap A in a contracted state, and FIG. 5 shows the expandable butt end wrap A in an expanded state. The above-mentioned expanding and contracting wood end wrapping A is placed over the wood end B such as a rafter at the eaves to decorate the wood end B, and the expanding and contracting wood end wrapping A is expanded and contracted according to the size of the wood end B at the site. . For fixing to the end B, nails, adhesives, etc. are used. In the present invention, the central part of the front surface is recessed leaving the four circumferential parts of the box body with the rear opening open, and the cross-sectional shape of the four circumferential parts of the box body is the groove-shaped cross section of the rear opening. A box body is formed in advance by press molding (in the combined invention, it is integrally molded from synthetic resin) so that the box body is cut into four L-shaped members and one
Since the end wrapper is formed by forming a frame with two mirror plates, there is no overlapping piece at the corner part of the L-shaped member as in the conventional case, and therefore the overlapping piece may turn over and look It is possible to provide an expandable and retractable end wrap that does not damage or cause injury, and since the box body is integrally molded, it is easy to round the corners, allowing for diversification of designs. Since the integrally molded box body is cut to obtain the necessary parts, it is possible to obtain expansion and contraction end wraps without loss of material.Also, since the box body is cut to obtain each part, there is no possibility of any strangeness when combining each part. In particular, when a flat metal plate with a surface finish such as oxidized finish is pressed to form a box, each member has a uniform surface, which creates a strange feeling when assembled. It will disappear.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the conventional example, Fig. 2 is a perspective view of a box obtained at an intermediate stage of the method of the present invention, Fig. 3 is a perspective view of the same box in a cut state, and Fig. 4 is FIG. 5 is a perspective view of the expandable butt end wrap obtained by the present invention in a contracted state; FIG. 5 is a perspective view of the above expandable butt end wrap in an expanded state; FIG. FIG. 7 is a perspective view of another embodiment with the same box body cut away, in which 1 is the box body, 2 is the end plate base part, 3 is the center part, 4 is the corner part, 5 is the step part, 6 is a mirror plate,
7 is an L-shaped member, and 8 is a small diameter portion.

Claims (1)

[Scope of Claims] 1. Leaving the four circumferential parts of the box body open at the back, the central part of the front face is recessed, and the cross-sectional shape of the four circumferential parts of the box body is made to be a head plate base part, and the cross-sectional shape of the four circumferential parts of the box body is the groove-shaped cross section of the back opening. At the same time, each center part of the upper, lower, right and left parts of the four circumferential parts is made smaller in diameter than the four corner parts of the four circumferential parts, so that each center part and each corner of the four circumferential parts are stepped. A metal plate is press-formed so as to be continuous, and then the outer periphery of the head plate element is cut to form a head plate, and each piece of the four circumferential parts is cut at one of the two step portions. Then, the four L-shaped members are assembled into a frame shape, and the small diameter portion of the end of the L-shaped member is slidably fitted into the adjacent L-shaped member. A method for manufacturing a expandable butt end wrapper, which is characterized by arranging a mirror plate within a frame made of shaped members. 2 Leave the four circumferential parts of the box body open at the back and recess the front central part to serve as the end plate element so that the cross-sectional shape of the four circumferential parts of the box body becomes the groove-shaped cross section of the back opening. Synthetic resin is made so that the center parts of the upper, lower, right and left parts of the four circumferential parts have smaller diameters than the four corner parts of the four circumferential parts, and each center part and each corner of the four circumferential parts are continuous at a stepped part. Then, cut the outer periphery of the head plate base part to form a head plate, and cut each piece of the four circumferential parts at one of the two steps to form four L. A shaped member is formed, and then framed in a frame shape with four L-shaped members, and the small diameter portion at the end of the L-shaped member is slidably fitted into the adjacent L-shaped member, and the L-shaped members are used to frame the frame. A method for manufacturing an expanding and contracting kiguchi-maki, which is characterized by arranging a mirror plate inside a wafer.