JPS6235409Y2 - - Google Patents

Description

[Detailed description of the invention] A folding book made of thin plate material such as cardboard, with the bottom wall, back wall, and slanted wall bent to form an isosceles triangular shape on the sides and with a non-slip surface at the front corner. There are other ideas for lecterns by the present applicant, but when books are propped up on the lectern and the book is propped upright, it is necessary to compensate for the lack of strength of the back wall, so the whole or at least the back wall part is made relatively thick. Efforts have been made to use materials such as 100%, or to place a reinforcing plate in close contact with the back wall, but all of these methods have the drawback of increasing manufacturing time and material costs.

The present invention has been devised for the purpose of eliminating the above-mentioned disadvantages and providing a sturdy lectern that is easy to look at and inexpensive, and is constructed as shown in the following embodiment.

The book lectern is usually made of thin cardboard of about 0.5 mm to 0.75 mm, and has a bottom wall 1, a back wall 2, and a diagonal wall 3 that are bent together. A non-slip Y having a desired shape is constructed by making the extension part step-like or protruding, and a book (not shown) is placed between this non-slip Y and the ridge line a'' of the upper edge of the back wall 2. In order to prevent the back wall 2 from being distorted or crushed by the weight of the book when the book is used, both sides of the back wall 2 should be moved inward by an appropriate width (approximately 20 mm to 25 mm) to increase its strength. In this case, a diagonal crease line 6 is provided at the lower end of the bent portions 5, 5 to connect with the crease lines 4, 4 of this portion, and this crease line A triangular part 7 surrounded by a transverse fold line a' extending to the side edge and intersecting with 6.
As shown in FIGS. 2 and 3, when folding the bent portions 5, 5 inward so as to rest on the upper surface of the bottom wall 1, at the same time, the same as before is formed at the upper end of the bent portions 5, 5. is the triangular part 9, the upper side of which is separated from the fold line a portion by a cut 10, and may be separated and removed from the fold line 8 diagonally from the fold line a portion along with the cut 10,
In any case, when assembling the triangular part 9 formed at the upper end of the bent parts 5, 5 or its separated end face,
It is made to be able to come into contact with the back surface of the slanted wall 3, to safely support the slanted wall, and to prevent the bending portions 5, 5 from swinging in order to maintain their bent state. The lower ends of the bent portions 5, 5 are at the crease line.
Both fold lines a', 6 are aligned so that the triangular part 7 formed by the outer part of a' and the diagonal crease line 6 provided on the outer side of the bent corner at the rear of the bottom wall 1 is in contact with the bottom wall 1.
Therefore, once the bottom and both side edges of the back walls 1 and 2 are folded in this way, as indicated by the phantom lines x ₁ and x ₂ in Fig. While maintaining the folded portions 5, 5 in a standing state, that is, at a bending angle of about 90 degrees,
Since the inclined wall 3 is supported at its upper end, it is possible to sufficiently prevent the risk of distortion or crushing even if a considerable weight of books is applied to the ridge line a'' at the upper end of the back wall. In order to strengthen the strength of the back wall 2, the strength of the back wall 2 itself can be improved without requiring the labor and additional materials such as laminating reinforcing materials in a polymeric manner or fixing separate reinforcing plates in a rolled-up shape on both sides. By only bending the side portions, the strength of the bent portions 5, 5 can be maintained and the supporting force of the back wall 2 can be increased, thereby reducing material costs and reducing weight. In addition, it is a convenient device that has many practical effects, such as being able to effectively achieve both the purposes of reinforcing the back wall and increasing its bearing capacity, and being able to quickly provide large quantities of inexpensive and robust lecterns.

In carrying out the present invention, a crease line is marked at the center of the diagonal wall, and after pushing the bent parts 5, 5 outward, the diagonal wall is folded inward along the crease line, thereby increasing the bulk of the product. It is convenient because it can be folded low.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic developed back plan view of the product, Fig. 2 is a partially cutaway perspective view showing an enlarged main part of the assembled state; FIG. 3 is a cutaway front view taken from the - line section in FIG. 2. 1...bottom wall, 2...back wall, 3...slanted wall, 4...
Crease line, 5...Bending part, 6, 8...Diagonal crease line, 7, 9...Triangular part, 10...Notch,
a′...Fold line, a″...Ridge line, y...Slip,
x ₁ , x ₂ ... bending part, 5, 5 ... bottom before formation,
A temporary line showing the condition of the back wall.

Claims (1)

[Scope of utility model registration request] Using a thin plate material such as cardboard, the bottom wall, back wall, and diagonal wall are bent to form an isosceles triangular shape on the sides, and an extension of the bottom wall or diagonal wall is preferably stepped or protruded at the lower front corner. In the case where a non-slip material is formed, a vertical crease line is provided on both sides of the back wall portion to enable it to be folded at an appropriate width at right angles, and from the lower end of the crease line to the outside edge of the bottom wall. go over
A lectern with a 45-degree fold line and a horizontal notch at the top end that reaches the vertical fold line and a 45-degree fold line that extends to the outer edge of the back wall.