JP2003269429A - Structure of fastening portion of mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide structure of fastening portion of a mold that does not require parts precision exactly, to reduce parts cost, to prevent the position displacement caused by transportation or the like, and to improve workability of press fitting and assembling work. <P>SOLUTION: A U-shaped locking portion 4 locking a sheet metal nut 10 has a gap in which the nut 10 moves freely, a projection is put on the bottom surface of the nut 10, and a recess 5 is placed on the mold surface to be engaged with the projection 13 at a position in which the nut 10 is contained in the locking portion 4. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold fastening portion structure, and more particularly, a structure of a portion for fastening divided molds of a digital camera or the like with screws. About. [0002] In a precision device having a plastic casing, molds forming the casing are fastened to each other and the precision device is housed inside. As such a fastening part structure of a mold, a sheet metal nut is usually attached to one mold, and the other mold is overlapped and fastened with screws. In such a structure,
Conventionally, a metal sheet metal nut provided with a female screw is fixed to a fastening portion of the mold, and another mold is fastened by a screw screwed into the female screw. The sheet metal nut having the female screw is fixed to the mold by providing a locking portion for inserting a U-shaped rib on the mold surface and inserting the sheet metal nut, as shown in FIGS. A sheet metal nut was pushed into the locking portion and fixed. The structure in which the sheet metal nut is inserted into this insertion part is difficult to insert when accurate press fitting is required, and accurate positioning is not easy.
There were problems such as being unable to conclude smoothly. On the other hand, in the structure in which the nut is loosely fitted to the locking portion, the nut is displaced or dropped during transportation and the assembly work becomes inefficient.
For this reason, it is difficult to manage the accuracy and press-fitting of the parts, leading to an increase in the cost of the parts. SUMMARY OF THE INVENTION An object of the present invention is to provide an improved mold fastening portion structure which solves the above problems. The problems of the present invention are as follows: (a) A structure that does not require strict component accuracy and reduce the cost of the component (b) Prevent misalignment due to transportation or the like. (C) To improve the workability of press-fitting and assembly work. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its technical means is a mold provided with a hook-like locking portion for locking a sheet metal nut. In this fastening portion, the locking portion has a clearance in which the nut moves freely, a protrusion is provided on the lower surface of the nut, and a recess is provided on the mold surface where the protrusion engages at a position where the nut is accommodated in the engaging portion. The fastening part structure of the mold is characterized by the above. Here, the shape of the insert means a shape in which both side walls and the bottom plate are attached to the back plate, the front plate is partially attached, and a holding portion is formed to insert and hold a thin plate from the open side. DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 3 and 4 are explanatory views of a conventional fastening structure. 3 is a plan view, and FIG. 4 is a cross-sectional view taken along the line B-B after the sheet metal nut is inserted. U on mold 1 as a whole
A rib-shaped rib 2 having a L-shaped cross section is protruded to form a holding-shaped (inserted) locking portion 4 into which a sheet metal nut 10 is inserted. A sheet metal nut 10 in which the tapped is formed to form the female screw 11 is inserted therein. A screw 20 is screwed into the female screw 11 of the sheet metal nut 10 through the hole 3 of the mold 1 and fastened together with other molds not shown. In such a conventional structure, if the sheet metal nut 10 is loosely fitted in the rib 2, the sheet metal nut 10 may fall off before the screw 20 is screwed and assembled. Is formed so as to be press-fitted into the rib 2, the problem of dropping off is eliminated, but extra force is required for inserting the sheet metal nut, and the female screw 11 and the screw 20 of the sheet metal nut 10 are used.
It is not easy to align the center and takes time to assemble. FIG. 1 is a plan view showing a structure of a fastening portion of a mold according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA. The mold 1 is provided with the ribs 2 to form the insertion-like locking portions 4 as in the conventional case. The difference is that
The hook-like locking portion 4 for locking the sheet metal nut 10 is provided with a gap in which the sheet metal nut 10 moves freely. In other words, press fitting was not required. In addition, the protrusion 13 is provided on the lower surface of the sheet metal nut 10, and the recess 5 that engages with the protrusion 13 is provided. The recess 5 is provided at a position where the protrusion 13 of the sheet metal nut 10 engages when the sheet metal nut 10 is accommodated in the locking portion 4. The sheet metal nut 10 has a gap with the engaging portion 4, and the dimensional accuracy of the sheet metal nut 10 may be appropriate, and insertion labor such as press fitting is not required. When the screw 20 is screwed together, the sheet metal nut housed in the locking portion 4 is not detached from the engaging portion 4 or dropped during conveyance due to the engagement between the projection 13 and the concave portion 5. The male screw and the female screw can be easily aligned. Sheet metal nut 1
0 and the engaging part 4 have directionality by the protrusion 13 and the recessed part 5, and there exists an effect that a misidentification can be prevented in the member meaningful in an insertion direction. The mold fastening portion structure of the present invention is constructed as described above, so that it is a structure that does not strictly require parts accuracy, can reduce the cost of parts, and can be press-fitted. It is unnecessary and improves the workability of the assembly work, and even if transported with the nut attached, there is an excellent effect that there is no position shift or dropout.

[Brief description of the drawings] FIG. 1 is a plan view of an embodiment. FIG. 2 is a cross-sectional view of an example. FIG. 3 is an explanatory diagram of a prior art. FIG. 4 is an explanatory diagram of the prior art. [Explanation of symbols] 1 Mold 2 ribs 3 holes 4 Locking part 5 recess 10 Sheet metal nut 11 Female thread 12 Insertion direction (arrow) 13 Protrusion 20 screws

─────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme code (reference) H05K 7/12 H05K 7/12 JP PF term (reference) 3J001 FA02 GA02 GA06 GB01 HA02 HA08 JA03 JD18 JD32 KA12 KB06 4E353 AA17 AA18 BB02 BB03 CC12 CC13 CC32 CC33 DD02 DD08 DD10 DR05 DR12 DR24 DR36 DR46 DR52 GG13 GG21

Claims (1)

[Claims] [Claims] [Claim 1] In a fastening portion of a mold provided with a hook-like locking portion for locking a sheet metal nut, the locking portion has a clearance for the nut to move freely, and the bottom surface of the nut A mold fastening portion structure characterized in that a projection is provided on the mold surface and a recess is provided on the mold surface to engage the projection at a position where the nut is accommodated in the engagement portion.