JP3057740U - Cover - Google Patents

Abstract

(57) [Problem] To provide a cover that is relatively unlikely to tear at a curved groove portion formed on the cover. SOLUTION: This cover 10 has a front cover 12, a back cover 1
4 and a back cover 16, a flexible plastic cover, near the boundary between the back cover 16, the front cover 12 and the back cover 14 and the back cover 16, from near the top 18 of the cover 10 to near the ground 20. A linear curved groove 22 for bending the spine 16 in a direction intersecting the vertical direction is formed, and the top end 22a and the ground side end 22b of the linear curved groove 22 are It does not reach the side edge 18a and the ground side edge 20a, but between the top edge 22a of the linear curved groove 22 and the top edge 18a of the spine 16, and the ground side of the linear curved groove 22. Between the end 22b and the ground side edge 20a of the spine 16, a tear-preventing portion 24 is formed to prevent the cover 10 from tearing therebetween.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 This invention relates to a front cover, particularly a plastic front cover, for example, a front cover, a back cover, and a back cover, in which a curved groove is formed in the back cover and near a boundary between the front cover and the back cover and the back cover. Plastic cover.

[0002]

[Prior art]

 Some conventional spine covers and two or three or more hinge grooves are formed near the boundary between the front cover and the back cover and the back cover, and the hinge grooves are formed by the top edge of the cover. From the ground side edge to the ground side edge.

[0003]

[Problems to be solved by the invention]

 However, since the conventional hinge groove for the cover is formed continuously from the top edge to the ground edge of the cover, for example, the hinge groove is formed at the top edge of the cover from the surface of the cover. When a force such as separation was applied, when the cover was used for many years, or when the curved portion of the hinge was bent several times, stress was concentrated and the cover could be torn. Therefore, the main purpose of the present invention is to provide a cover which is relatively less likely to tear at the curved groove portion formed on the cover.

[0004]

[Means for Solving the Problems]

 The front cover according to claim 1 is a flexible plastic front cover comprising a front cover, a back cover, and a back cover, and near the top of the back cover and the boundary between the front cover and the back cover and the back cover. A linear curved groove is formed in the direction from the top to the bottom of the spine, and the top end and the ground end of the linear curved groove are formed in the spine. It does not reach the top edge and the ground edge, but between the top edge of the linear curved groove and the top edge of the spine, and between the ground edge of the linear curved groove and the spine. The front cover has a tear-resistant portion formed between the ground edge and the front cover to prevent the cover from tearing therebetween. In the cover according to claim 2, the top end and the ground end of the curved groove are gradually deepened in the top direction at the top end and in the ground direction at the ground end. The cover according to claim 1, wherein the cover is formed so as to be shallow. In the cover according to the third aspect, the top end and the ground end of the curved groove are gradually deepened in the top direction at the top end and in the ground direction at the ground end. The cover according to claim 1 or 2, wherein the cover has a shallower shape and is formed in an arc shape as viewed in a direction intersecting the vertical direction. The cover according to claim 4, wherein the tear-proof portion covers the entire curved groove, between the top end of the linear curved groove and the top edge of the spine, and the ground of the linear curved groove. The cover according to any one of claims 1 to 3, wherein the cover is formed in a band shape extending in a direction perpendicular to the top and bottom directions between the side end and the ground edge of the spine.

[0005] In the invention according to claim 1, since the tear-proof portion is formed, the stress concentration on the hinge groove of the cover can be torn as in a conventional cover, and the cover has been used for many years. It does not tear easily. In the device according to the second aspect, the top end and the ground end of the curved groove are formed so that the depth of the groove gradually becomes shallow and reaches the tear-proof portion. In addition, the thickness of the cover increases and the cover is less likely to tear. In the invention according to claim 3, the top end and the bottom end of the curved groove are formed so that the depth of the groove gradually becomes shallow and reaches the tear-proof portion, so that the groove is gradually formed. In addition, the thickness of the cover increases and the cover is less likely to tear. In the invention according to claim 4, between the left and right curved grooves, between the top end of the linear curved groove and the top edge of the spine, and the ground side end of the linear curved groove and the spine. It is formed in a belt shape extending in a direction orthogonal to the up-down direction between the ground side edge and the front side, so that it has the same strength as the other parts of the cover.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention with reference to the drawings.

[0007]

[Embodiment of the invention]

 1 is a front view of a cover according to the embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. 1A-A, FIG. 3 is a cross-sectional view of FIG. 1BB, and FIG. FIG. 5 is a partially enlarged view of FIG.

The cover 10 is made of a flexible rectangular flat sheet made of plastic such as polypropylene, and includes a front cover 12, a back cover 14, and a spine 16.

On the surface of the spine 16 and near the boundary between the front cover 12, the back cover 14 and the spine 16, a straight line is formed in the vertical direction of the cover 10 from the top 18 of the cover 10 to the vicinity of the ground 20 of the cover 10. A curved groove 22 is formed. For example, 14 curved grooves 22 are formed at 1.5 mm pitch on the A4 cover 10, and a plurality of curved grooves 22 are formed, such as 24 or 30 according to the width and thickness of the spine 16. Have been. The curved groove 22 allows the cover 10, particularly the spine 16, to be bent in a direction orthogonal to the top and bottom directions of the cover 10.

The top end 22 a and the bottom end 22 b of the curved groove 22 do not reach the top 18 a of the cover 18 on the top 18 and the bottom end 20 b on the ground 20, Between the top end 22a of the curved groove 22 and the top edge 18a of the cover 18 on the top 18 side, and the ground end 22b of the curved groove 22 and the ground edge of the cover 10 on the ground 20 side. A space portion where no curved groove 22 for preventing the cover 10 from tearing therebetween, that is, a tear prevention portion 24 is formed between the cover 20 and the cover 20a. The tear-proof portion 24 extends in the longitudinal direction of the cover 10 from the leftmost curved groove 22 to the rightmost curved groove 22 of the curved groove 22, that is, in a band shape extending in a direction orthogonal to the top and bottom direction of the cover 10. Is formed. The tear-proof portion 24 is formed on both the top 18 side and the ground 20 side of the spine 16.

In the vicinity of the top end 22a of the curved groove 22 and the vicinity of the ground end 22b, the groove is gradually formed in the top direction at the top end 22a and in the ground direction at the ground end 22b. It is formed so that the depth becomes shallow and reaches the crack-proof portion 24. In the cover 10, the curved groove 22 is formed in an arc-shaped cross section near the top end 22 a and near the ground end 22 b of the curved groove 22 when viewed in a direction intersecting the top and bottom directions.

Next, a method of forming the curved groove 22 on the cover 10 will be described with reference to FIGS. FIG. 6 is a diagram showing a step of forming the curved groove 22 on the cover 10, FIG. 6 (A) is a perspective view showing a step of forming the curved groove 22, and FIG. It is a figure.

First, a plastic sheet made of a flexible polypropylene or the like for forming the cover 10 is prepared, fed below a punching die such as a Thomson blade, and placed on a lower pressure plate (not shown). By pressing the sheet toward the sheet, the outer shape of the cover 10 having a flat rectangular shape is punched out as shown in FIG. 7, and the outer shape is formed.

The cover material 10A shown in FIG. 7 formed in a predetermined outer shape in the punching blade die is sent to a curved groove forming step of forming a curved groove 22 in the next step. In the step of forming the curved groove 22, the curved groove 22 is formed by the groove digging blade 30 having a V-shaped cross section and a thin and substantially rectangular front surface. The groove digging blade 30 has arc-shaped portions 30a formed at both ends in the longitudinal direction. A plurality of digging blades 30 are fixed to the upper plate 32 corresponding to the pitch of each curved groove 22, and the upper plate 32 is heated to, for example, 100 ° C. by a heater (not shown) or the like. Is formed. In order to form the curved groove 22 by the digging blade 30, the upper plate 32 is heated and directed toward the cover 10A placed on a lower plate (not shown) formed below the upper plate 32. The cover 10 is formed so as to move up and down, leaving a space between the top side edge 18a on the top 18 side of the cover 10 and the ground side edge 20a on the ground 20 side. In order to form the curved groove 22, the digging blade 30 is applied from the front surface to the back surface of the cover 10, and the digging is performed while the cover material 10 </ b> A is slightly melted by the digging blade 30 heated to about 100 ° C. Done. At this time, if there is a swelling portion near the top of the curved groove 22 of the cover material 10A, the swelling portion is melted again by the smoothing hot plate, and smoothed by the smooth surface of the smooth heating plate. The cover 10 may be completed.

In actual use of the cover 10, as shown in FIG. 8, two through-holes 50 are formed in the back cover 14 of the cover 10 in the vicinity of the curved groove 22, and the caulking studs 52 are used. The binding device 54 is fixed to the back cover 14 to form a file. Then, as shown in FIG. 9, the cover 10 is bent so that the curved groove 22 is expanded, and the front cover 12 and the back cover 14 are used facing each other.

[0016]

[Effect of the invention]

 According to the first aspect of the present invention, since the tear-proof portion is formed, stress concentration on the hinge groove of the cover as in the conventional cover can be avoided, and the cover is torn even if used for many years. And a cover with excellent durability can be obtained. According to the invention of claim 2, the top end and the ground end of the curved groove are formed so that the depth of the groove gradually becomes shallow and reaches the tear-proof portion. The thickness of the cover gradually increases and the cover is less likely to tear, resulting in a cover with excellent durability. According to the invention of claim 3, the top end and the ground end of the curved groove are formed so that the depth of the groove gradually decreases to reach the tear-proof portion. The thickness of the cover gradually increases and the cover is less likely to tear, resulting in a cover with excellent durability. According to the invention of claim 4, over the entirety of the curved groove, between the top end of the linear curved groove and the top edge of the spine, and the ground end of the linear curved groove. Since it is formed in a belt shape extending in the direction perpendicular to the top and bottom direction between the spine and the ground side edge, it has the same strength as other parts of the cover without curved grooves. , Resulting in a cover with excellent durability.

[Brief description of the drawings]

FIG. 1 is a front view of a cover according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1A-A.

FIG. 3 is a cross-sectional view of FIG. 1BB.

FIG. 4 is a partially enlarged view of a portion C-C in FIG. 2;

FIG. 5 is a partially enlarged view of FIG. 3;

6A and 6B are diagrams illustrating a process of forming a curved groove on a cover, and FIG. 6A is a schematic perspective view illustrating a process of forming a curved groove, and FIG. is there.

FIG. 7 is a plan view of a cover material showing a process of forming the cover.

FIG. 8 is a schematic perspective view showing a method of using the cover.

FIG. 9 is an end view illustration of a main part of the cover shown in FIG. 8;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 cover 10A cover material 12 cover cover 14 back cover 16 spine cover 18 cover top 18a top side edge 20 cover ground 20a ground side edge 22 curving groove 22a curving groove top side end 22b curving groove Ground side end 24 Crack-proof part 30 Groove blade 30a Arc-shaped part 32 Upper plate 50 Through-hole 52 Caulking rivet 54 Binding tool

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Homon Marukawa 1-11-2 Nojinbashi, Chuo-ku, Osaka City Inside Lihit Lab Co., Ltd. No. In Lichtlab

Claims (4)

[Utility model registration claims] 1. A flexible plastic cover comprising a front cover, a back cover and a back cover, wherein the back cover and the vicinity of the boundary between the front cover and the back cover and the back cover, from near the top of the cover to near the ground. A linear curved groove that curves the spine in a direction intersecting with the vertical direction is formed, and the top end and the ground end of the linear curved groove are the top edge of the spine and It does not reach the ground side edge, but between the top end of the linear curved groove and the top edge of the spine, and the ground side end of the linear curved groove and the ground end of the spine. A cover with a tear-resistant portion formed between the edge and the cover to prevent the cover from tearing therebetween. 2. The top end and the ground end of the curved groove are:
2. The cover according to claim 1, wherein the groove is formed so that the depth of the groove gradually decreases in the top direction at the top end and in the ground direction at the ground end. 3. The top end and the ground end of the curved groove are
2. The groove according to claim 1, wherein the depth of the groove gradually becomes shallower in the ceiling direction at the top end and in the ground direction at the ground end, and is formed in an arc shape in a direction intersecting the top and bottom directions. Item 2. The cover according to item 2. 4. The tear-proof portion is provided between the top edge of the linear curved groove and the top edge of the spine over the entire curved groove and on the ground side of the linear curved groove. The cover according to any one of claims 1 to 3, wherein the cover is formed in a band shape extending in a direction orthogonal to the vertical direction between the end and the ground edge of the spine.