JPH0740429U - Hinge structure - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a hinge portion structure capable of enlarging a curved portion of a corner portion without widening a thin portion of a groove. [Structure] The developed hinge parts 11 to 18 for assembling the storage case 1 are formed by linearly thin grooves G1 which are recessed in the bending direction. The groove G1 is formed in the direction opposite to the bending direction of the substrate, and the opposed edges 22a and 23a of the pair of raised portions 22 and 23 sandwiching the groove bottom 21 of the groove G1.
Is curved in an arc shape in cross section. When it is bent so that the groove G1 is on the outside, the corner portion of the bent portion is largely curved. Since the groove bottom portion 21 is recessed inside the raised portions 22 and 23, the groove bottom portion 21 is protected against an external impact without directly hitting it. If the auxiliary groove G2 is formed so as to be slightly smaller, with the center thereof aligned with the groove G1 at the position opposite to the back surface thereof, it becomes easy to bend the groove G1 inward as a fold line (easy to make a valley fold).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a hinge portion formed on a synthetic resin substrate.

[0002]

[Prior art]

 As shown in Figs. 4 (a) and 4 (b), the conventional hinge-molded product has a cross-section with a trapezoidal cross section between the ridges 21 'and 22' serving as the substrate on the surface of the synthetic resin substrate on the bending side. The groove G1 'is formed. And, in order to increase the curvature of the corner of the bent part, it is necessary to set the thin part of the groove wide, but if the thickness of the groove part is thin, it will not function as a hinge and the thin part If it is wide, the moldability is poor.

[0003]

[Problems to be solved by the device]

 This invention was devised to solve the above-mentioned drawbacks, and the main problem is that the curved portion of the corner can be enlarged without widening the thin portion of the groove. It is to provide a hinge part structure.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the invention of claim 1, (a). In a hinge portion structure in which a groove is formed in a synthetic resin substrate to make it bendable, (b). The groove is opposite to the bending direction of the substrate. (C). The technical measures are taken such that (c). The opposing edges of the pair of raised portions sandwiching the groove are curved in an arc shape in cross section. In addition to the above structure, the invention of claim 2 provides (d) a technical means of forming an auxiliary groove on the rear surface of the substrate where the groove is formed so as to face the groove along the groove. I am taking it.

[0005]

[Action]

 Since the groove is formed in the direction opposite to the bending direction of the substrate, a large curved portion can be formed outside the bending portion. Since it is not necessary to widen the width of the groove, there is no fear that the formability will be weakened. Further, if the auxiliary groove is provided on the bending side as well, the bending becomes easy.

[0006]

【Example】

 A preferred embodiment in which the hinge structure of the present invention is applied to a storage case will be described below with reference to the drawings. The storage case 1 shown in FIG. 1 shows an expanded shape, and includes a rectangular back plate piece portion 2 and a pair of vertically extending hinge portions 11 along the left and right sides of the back plate piece portion 2, The left and right side plate pieces 3 and 4 which are continuously provided via 12 are connected in the lateral direction.

The left side plate piece 3 is formed with sideways hinge portions 13 and 14 along the upper and lower sides, and the outer side overlapping piece portion 5 is connected via the upper sideways hinge portion 13, and The overlapping piece portion 6 on the outer side is connected via the sideways hinge portion 14. Similarly, the right side plate piece portion 4 is formed with sideways hinge portions 15 and 16 along the upper and lower sides, and the inner side overlapped piece portion 7 is connected via the upper sideways hinge portion 15, and the lower sideways side portion 4 is connected. The overlapping piece portion 8 on the inner side is connected via the hinge portion 16. Further, the back plate piece 2 is formed with sideways hinge portions 17 and 18 along the upper and lower sides thereof, and the folding-back auxiliary piece portions 9A and 9B are connected through the sideways hinge portions 17 and 18, respectively. There is.

Here, each of the hinge portions 11 to 18 is composed of a linear groove G1 which is recessed in the bending direction and which is thin. As shown in FIG. 2 (a), the groove G1 is formed in the direction opposite to the bending direction of the substrate, and the pair of raised portions (each piece serving as the substrate) 22 and 23 sandwiching the groove G1 are formed so as to face each other. It is curved in an arc shape in cross section.

In the present embodiment, the thickness of each piece is 0.5 to 0.6 mm, while the thickness left in the groove G1 is set to be 0.1 mm or more and less than 0.2 mm. It is preferable for bending so as to surround the groove G1. Then, when the groove G1 is bent so as to be on the outer side, as shown in FIG. 2B, the corner portion of the bent portion is largely curved. Further, since the groove bottom portion 21 is recessed inside the raised portions 22 and 23, the groove bottom portion 21 is protected without being directly hit by an external impact from the outside.

FIG. 3A shows a different embodiment in which an auxiliary groove G2, which is slightly smaller than the center of the groove G1 in a position facing the groove G1, is provided. Since other configurations are similar to those of the above-described embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

In this case, since the auxiliary groove G2 is provided, it is easy to bend the groove G1 inward as a fold line (easily to make a valley fold), so that the groove can be surely bent at the time of box making. Further, the hinge structure of the present invention is not limited to the storage case, but can be used for a structure that is bent using a synthetic resin material.

In the above embodiment, the case of using as a hinge for molding a box-shaped storage case is illustrated, but in the present invention, it can be applied to all hinge structures provided in other synthetic resin products. .

[0013]

[Effect of device]

 As described above, according to this invention, it is possible to form a large curvature of the corner portion that is bent through the hinge portion without impairing the formability. Further, the groove bottom portion has stability because it does not directly hit an external impact.

[Brief description of drawings]

FIG. 1 is a development view of a preferred embodiment of a storage case using a hinge portion of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a first embodiment of a hinge part, (a) showing a developed state and (b) showing a bent state.

FIG. 3 is a cross-sectional view of a main part showing a second embodiment of the hinge portion, (a) showing a developed state and (b) showing a bent state.

FIG. 4 is a sectional view of a main part showing a conventional example of a hinge part,
(A) is a figure which shows a deployment state, (b) is a figure which shows a bending state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage case 2 Back plate piece part 3 Left side plate piece part 4 Right side plate piece part 5-8 Overlapping piece part 11-18 Hinge part G1 groove G2 Auxiliary groove

Claims (3)

[Scope of utility model registration request] 1. In a hinge part structure in which a groove is formed in a synthetic resin substrate so as to be bendable, the groove is formed in the direction opposite to the bending direction of the substrate, and the opposing edges of a pair of raised portions sandwiching the groove are formed. A hinge part structure characterized by being curved in an arc shape in cross section. 2. The hinge part structure according to claim 1, wherein an auxiliary groove is formed on the back surface of the portion of the substrate where the groove is formed so as to face the groove along the groove. 3. A left and right substrate, wherein a substrate is continuously provided via a rectangular back plate piece and a pair of vertically extending hinges linearly set along the left and right sides of the back plate piece. Each of the side plate pieces and the left and right side plate pieces is continuously provided via a hinge portion extending laterally along the upper and lower sides, and is composed of a pair of upper and lower overlapping pieces, and one surface is open. The hinge part structure according to claim 1, wherein the hinge part structure can be assembled in a box-shaped storage case.