JPH11220268A - Case side slip prevention mechanism - Google Patents

Abstract

(57) Abstract: The present invention provides a case misalignment prevention mechanism that does not cause a dent after molding on the outer surface of a case and has improved lateral misalignment prevention strength. SOLUTION: One screw boss 11 protruding from the inner surface of an upper case 10, the other screw boss 21 projecting from the inner surface of a lower case 20 and paired with the one screw boss, and the upper case One side slip prevention rib 13 formed in a cylindrical shape around the one screw boss on the inner surface, and the one side formed in a cylindrical shape around the other screw boss on the lower case inner surface. The case side slip prevention mechanism is configured to include the side slip prevention rib and the other side slip prevention rib 23 forming a pair.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for preventing lateral displacement of a case after fixing an upper case and a lower case.

[0002]

2. Description of the Related Art A structure in which an upper case and a lower case are combined into one case is employed in various devices. Among the devices, for example, a controller of a game machine often has a solid structure in anticipation of being considerably messy by an operator. Fixing of the combined upper case and lower case is generally performed using screws. More specifically, one screw boss protrudes from the inner surface of the upper case, and the other screw boss that forms a pair with the screw boss protrudes from the inner surface of the lower case. By fastening, the upper and lower cases are detachably connected. By providing the screwing mechanism at a plurality of locations, the upper and lower cases can be firmly assembled.

[0003] In the above structure, the degree of coupling of the screw in the axial direction can be considerably increased by the degree of fastening of the screw.
However, displacement between the upper and lower cases (hereinafter, referred to as lateral displacement) that occurs in a direction orthogonal to the axis of the screw cannot be prevented only by the screwing mechanism. Therefore, conventionally, a case lateral displacement prevention mechanism as shown in FIG. 5 is applied. FIG.
(A) is a sectional view, where 10 is an upper case and 20 is a lower case. FIG. 5B is a plan view of the inside of the lower case 20. The lower case 20 has a screw boss 2 at the center.
1 is formed so as to protrude from the inner surface. The upper case 10 is formed with a screw boss that is paired with the screw boss 21, but is not shown in the drawing.

In the illustrated example, a pair of lateral shift prevention bosses 22 and 2 are provided on both sides of a screw boss 21 of the lower case 20.
2 are formed. The upper case 10 is formed with a lateral displacement prevention boss 12 that is paired with the lateral displacement prevention boss 22. In the illustrated example, the lateral displacement prevention boss 22 on the lower case 20 side is concave, and the lateral displacement prevention boss 12 on the upper case 10 side is convex. As shown in FIG. 5 (A), when the pair of lateral displacement prevention bosses 12 and 22 are fitted, two lateral displacements of the upper case 10 and the lower case 20 besides the screw portion using the screw boss 21. Therefore, even if an external force is applied to the assembled case, lateral displacement between the upper and lower cases 10, 20 is prevented.

[0005]

Generally, upper and lower cases 10, 20 are formed of a relatively hard resin material, and various bosses 12, 21, 22 are formed integrally with corresponding cases. Is done. For this reason, the convex lateral displacement prevention boss 12 has a low mechanical strength, and may be damaged when a strong external force is applied. Further, the concave side slip prevention boss 22 has a thicker connection portion (root) with the lower case 20, so that a recess called sink mark after molding is formed in the lower case 2.
0 near the outer surface 22A, thereby deteriorating the appearance as a product. These are the problems to be solved by the present invention.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a case lateral displacement preventing mechanism which does not cause a recess on the outer surface of a case and which can improve the lateral displacement preventing strength.

[0007]

The object of the present invention is to provide a screw boss protruding from the inner surface of an upper case,
The other screw boss, which is paired with the one screw boss, protruding from the inner surface of the lower case, and one side slip prevention formed in a cylindrical shape around the one screw boss on the inner surface of the upper case. Achieved by a case side slip prevention mechanism including a rib and the other side slip prevention rib paired with the one side slip prevention rib formed in a cylindrical shape around the other screw boss on the inner surface of the lower case. it can.

The cylindrical side slip prevention rib has a stronger coupling strength with the inner surface of the case than the conventional convex side slip prevention boss, so that it is less likely to be damaged even when a strong external force is applied. In addition, since the cylindrical lateral displacement prevention rib can be made thinner than a conventional concave-type lateral displacement prevention boss, it is possible to prevent the occurrence of a dent after molding. According to the embodiment of the present invention, the outer diameter of the one lateral deviation preventing rib is equal to the inner diameter of the other lateral deviation preventing rib, or the inner diameter of the one lateral deviation preventing rib is the other one. It is equal to the outside diameter of the side slip prevention rib. In addition, if the tip surfaces of the one and the other lateral displacement preventing ribs are inclined, fitting of the lateral displacement preventing ribs at the time of assembling the case becomes easy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. 1 (A) and 1 (B) are a cross-sectional view of a case lateral displacement prevention mechanism and a plan view of a lower case alone showing an embodiment of the present invention. In this figure, 10 is an upper case, 11 is a convex screw boss protruding from the inner surface of the upper case 10, 20 is a lower case,
Reference numeral 21 denotes a concave screw boss protruding from the inner surface of the lower case 20, reference numeral 13 denotes a large-diameter lateral displacement prevention rib formed in a cylindrical shape around the screw boss 11 on the inner surface of the upper case 10, and reference numeral 23 denotes an inner surface of the lower case 20. And a small-diameter lateral displacement preventing rib formed in a cylindrical shape around the screw boss 21.

The rib 13 is formed concentrically with the boss 11,
Similarly, the rib 23 is formed concentrically with the boss 21.
Screws (not shown) for connecting the upper and lower cases 10, 20
Is inserted into the concave portion 21 </ b> A of the concave boss 21 and screwed to the tip of the pair of convex bosses 11. In the connection state shown in FIG. 1A, since a cylindrical lateral displacement prevention structure formed by fitting of the ribs 13 and 23 is concentric around the connection portion formed by screwing the bosses 11 and 21, the upper and lower cases are not provided. 1
At 0, 20, mutual lateral displacement is prevented, and a firm connection is maintained.

FIG. 2, FIG. 3, and FIG. 4 are sectional views showing a specific example (controller of a game machine) of the present invention,
FIG. 3 is a plan view of the inside of the upper case 20 and a plan view of the inside of the upper case 20. As shown in FIG. 2, a through hole 21B for screw insertion is provided at the tip of the screw insertion recess 21A of the concave boss 21.
Are formed, and a concave portion 11A for screwing is formed in the axis of the convex boss 11. Cylindrical rib 1
The tip surfaces of 3, 23 are inclined in the same direction. Therefore, when assembling the upper and lower cases 10, 20, the ribs 13, 2
3 can be easily performed. In particular, as shown in FIGS. 3 and 4, when two sets of the ribs 13 and 23 are formed, it is difficult to assemble due to dimensional accuracy. It has a mutual guiding function to facilitate assembly.

[0012] As shown in FIG.
Screw bosses 11 and 21 not surrounded by 3,23
There is also a set. In FIGS. 3 and 4, two sets of the ribs 13 and 23 are used, but the number of the sets may be one or three or more. The relationship between the large diameter and the small diameter of the ribs 13 and 23 may be reversed.
Further, the relationship between the bosses 11 and 21 may be reversed.

[0013]

As described above, according to the present invention, it is possible to provide a case lateral displacement prevention mechanism which does not cause a concave after molding on the outer surface of the case and can improve the lateral displacement prevention strength. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a specific example of the present invention.

FIG. 3 is a plan view showing the inside of a lower case of the specific example of FIG. 2;

FIG. 4 is a plan view showing the inside of the upper case of the specific example of FIG. 2;

FIG. 5 is a configuration diagram of a conventional case lateral displacement mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Upper case 11 One screw boss 13 One side slip prevention rib 20 Lower case 21 The other screw boss 23 The other side slip prevention rib

Claims (4)

[Claims] A screw boss protruding from an inner surface of an upper case; a screw boss projecting from an inner surface of a lower case, the other screw boss forming a pair with the one screw boss; One side slip prevention rib formed in a cylindrical shape around one screw boss; and the one side slip prevention rib formed in a cylindrical shape around the other screw boss on the inner surface of the lower case. A case side slip prevention mechanism, comprising: the other side slip prevention rib that is paired with the case. 2. The outer diameter of the one side slip prevention rib is
2. The case side slip prevention mechanism according to claim 1, wherein an inner diameter of the other side slip prevention rib is equal to an inner diameter of the other side slip prevention rib. 3. The inner diameter of the one side slip prevention rib is:
2. The case side slip prevention mechanism according to claim 1, wherein an outer diameter of the other side slip prevention rib is equal to an outer diameter of the other side slip prevention rib. 4. A front end surface of each of the one and other lateral displacement prevention ribs is inclined.
Any of the cases side slip prevention mechanism.