JP3269394B2 - Built-in case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting case in which an upper case half and a lower case half can be easily and accurately assembled without using screws.

[0002]

2. Description of the Related Art An electrical control unit mounted on a vehicle includes:
Since many of them are arranged near the engine room, and the electronic devices constituting the unit cannot be arranged without being exposed, they are generally housed in a case that can be disassembled at the time of periodic inspection or the like. As a case for this type of vehicle-mounted electronic device, for example, a case in which an upper case half and a lower case half are screwed to each other has been often used. However, a case in which the upper case half and the lower case half are fixed to each other with set screws has a problem that it takes a long time to fix the screws and requires a lot of man-hours for assembling. Even if the repair and inspection work is performed when it occurs, there is a problem that the work of removing the set screw is troublesome.

[0005] In view of the above, for example, a fitting case 1 shown in FIG. 4 has been proposed so that a pair of upper and lower case halves can be assembled without using set screws. The fitting type case 1 shown in FIG.
b, an upper case half 2 having a rectangular hole 3 formed therein, and a lower case half 4 having a rectangular projection 5 protruding from a side panel 4b connected to a bottom panel 4a, as shown in FIG. The inner wall of the side panel 2b of the upper case half 2 and the outer wall of the side panel 4b of the lower case half 4 are assembled together. At the time of this assembling, as shown in FIG. 5, the rectangular projections 5 are engaged with the rectangular holes 3, and the upper case half 2 and the lower case half 4 are assembled so that they cannot be separated from each other.

[0004]

The above-mentioned conventional fitting type case 1 has a structure in which a rectangular projection 5 is engaged in a rectangular hole 3 and the upper case half 2 and the lower case half 4 are assembled to each other. Therefore, in order to minimize the backlash expected at the time of assembly, the vertical and horizontal dimensional accuracy of the rectangular hole 3 and the rectangular protrusion 5
It is very important to maintain the vertical and horizontal dimensional accuracy of.
However, even if efforts are made to maintain the dimensional accuracy, even if the vertical and horizontal dimensions of the rectangular hole 3 and the rectangular projection 5 slightly deviate from the design values, a complete engagement state cannot be obtained, causing various problems. That was clear. For example, rectangular projection 5
If the vertical and horizontal dimensions of are larger than the vertical and horizontal dimensions of the rectangular hole 3,
Since the rectangular projections 5 cannot be engaged with the rectangular holes 3, the upper case half 2 and the lower case half 4 are simply connected to the side panels 2b and 4 respectively.
b. Since the two members are merely engaged with each other, only defective products that cannot be practically used are obtained. Conversely, when the vertical and horizontal dimensions of the rectangular projection 5 are less than the vertical and horizontal dimensions of the rectangular hole 3, some play occurs between the rectangular hole 3 and the rectangular projection 5, so that vibration from the road surface or engine The side panels 2b and 4b rub against each other due to the vibration from the room, and it is easy to emit an unpleasant friction sound. Such a friction sound is not only annoying, but the backlash and chatter accompanying the friction adversely affect the electronic device inside the case 1. There were issues such as easy access.

The present invention solves the above-mentioned conventional problems. The upper case half and the lower case half are engaged with a rectangular hole formed in a side panel and a semi-conical projection. The purpose is to assure assembly with a tolerance of zero.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an upper case half having a rectangular hole formed in a side panel connected to both sides of a top panel, and having at least a bottom side opened; A half-cone projection is formed on a side panel connected to both sides and has a shape in which a cone is substantially divided into two substantially perpendicular to the bottom surface. At least a lower case half having an open upper surface is assembled with each other. The side panels are joined together in a state where the conical protrusions are engaged,
When the upper case half and the lower case half are assembled, the bottom surface of the semi-conical projection is formed on four sides of the rectangular hole so that the opening of the rectangular hole partially rides on the conical surface of the semi-conical projection. The length of one side opposing to is smaller than the length of the chord of the bottom surface of the semi-conical projection.

[0007] The present invention also provides a lower case half having a rectangular hole formed in a side panel connected to both sides of a bottom panel and opening at least an upper side, and a cone formed in a side panel connected to both sides of the upper panel. A half-cone projection, which is substantially vertically divided into two parts, is protruded, and at least an upper case half having an open upper surface is assembled with each other, and the side panel is in a state where the half-cone projection is engaged with the rectangular hole. When the lower case half and the upper case half are assembled together, the opening of the rectangular hole partially rides on the conical surface of the semiconical protrusion, so that the four sides of the rectangular hole are The length of one side facing the bottom surface of the semi-conical protrusion is smaller than the length of the chord of the bottom surface of the semi-conical protrusion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing one embodiment of a fitting type case of the present invention, and FIG.
3 is an exploded perspective view of a main part of the fitting type case shown in FIG. 1, and FIG. 3 is an exploded perspective view of the fitting type case shown in FIG.

A fitting type case 11 shown in FIG. 1 has a rectangular hole 13 formed in a side panel 12b connected to both sides of a top panel 12a, and an upper case half 12 having at least a bottom side opened, and a bottom panel 14a provided on both sides. The continuous side panel 14b is provided with a semi-conical projection 15 having a shape in which a cone is substantially divided into two substantially perpendicular to the bottom surface, and includes a lower case half 14 having at least an open upper surface. In the present embodiment, as shown in FIG. 3, two rectangular holes 13 are formed in each of the left and right side panels 12b. Two projections are provided on the outer wall portion 14b. The upper case half 12 and the lower case half 14 are assembled by joining the side panels 12b and 14b together in a state where the semi-conical projection 15 is engaged with the rectangular hole 13.

As one of the major features of the fitting type case 11, as shown in FIG. 2, the length a of one side (horizontal side) of the four sides of the rectangular hole 13 facing the bottom surface of the semiconical projection 15 is defined as follows. The length of the chord at the bottom surface of the semiconical projection 15 is smaller than the length c. However, the dimension notation shown in the figure is: a; the dimension of the horizontal side of the rectangular hole 13 b; the dimension of the vertical side of the rectangular hole 13 d; the depth of the rectangular hole 13 c; H: height of the semi-conical projection 15 l: axial length of the semi-conical projection 15, and a <c (1) is the largest premise for achieving the desired engagement state. It can be said that it is a condition. The longitudinal dimension b of the rectangular hole may be the same as or slightly smaller than the axial length 1 of the semi-cone, and b ≦ l (2). Further, the depth d of the rectangular hole 13 is equal to that of the semiconical projection 15.
D ≒ h (3).

By providing the dimensional relationship shown in the above equation (1), the fitting type case 11 can be mounted on the side panel 12b,
When the upper case half 12 and the lower case half 14 are assembled to each other by joining them together, the rectangular holes 13 and the semi-conical projections 15 can be engaged with zero tolerance.
That is, when the semi-conical projection 15 is engaged with the rectangular hole 13, the opening of the rectangular hole 13 partially rides on the conical surface of the semi-conical projection 15, and the generatrix of the conical surface and the vertical side of the rectangular hole 13 are aligned. Obliquely, the opening of the rectangular hole 13 floats from the side panel 14 b by the amount of riding on the semi-conical projection 15.

However, there is no play in the engagement relationship, and an elastic force is generated at the base of the side panel 12b in accordance with the floating height of the opening surface of the rectangular hole 13. Because the state is kept stable for a long time,
There is no play in the engagement between the upper case half 12 and the lower case half 14. Therefore, even in a harsh environment such as a case for an in-vehicle electronic device, which is constantly subjected to vibration from a road surface or an engine room, the upper case half 12 and the lower case half 14 may rub against each other to generate abnormal noise. However, it is possible to sufficiently protect the internal electronic devices. Further, the floating height itself is extremely small, and the side panels 12b and 14b are assembled in a state close to a completely joined state with almost no gap. It is hard to notice and does not give any discomfort.

Also, when assembling the case halves 12, 14, the side panels 12b, 14b may be joined until the rectangular hole 13 and the semi-conical projection 15 make a clicking sound. Since no steps are required, the assembling work is very simple. Also, the upper case half 12
Even if the lower case half 14 is detached from the lower case half 14, the upper case half 12 is kept until one of the four sides of the rectangular hole 13 that faces the bottom surface of the semiconical protrusion 15 exceeds the height of the semiconical protrusion 15. It is only necessary to pry the side panel 12b, and after exceeding the protruding height of the semiconical projection 15, the semiconical projection 15
The case halves 12, 14 can be easily separated from each other simply by sliding the side panel 12b along the conical surface of the case. For this reason, maintenance and inspection of electronic devices are also easy.

As described above, the fitting type case 11
When the upper case half 12 and the lower case half 14 are assembled together, the rectangular hole 1
The length a of one side of the four sides of the rectangular hole 13 facing the bottom surface of the semi-conical projection 15 is set so that the opening of
Since the length of the chord at the bottom of the semi-conical projection 15 is smaller than the length c of the chord, the semi-conical projection 15 protruding from the side panel 14b of the lower case half 14 is formed on the side panel 12b of the upper case half 12. The opening of the rectangular hole 13 is engaged with the drilled rectangular hole 13 so that the opening of the rectangular hole 13 rides on a part of the conical surface of the semi-conical projection 15, and the semi-conical projection 15 is always allowed to have a tolerance with respect to the rectangular hole 13. The engagement can be performed at zero, and play can be prevented.

In the above embodiment, a rectangular hole 13 is formed in the side panel 14b of the lower case half 14, and a semi-conical projection 15 is formed in the side panel 12b of the upper case half 12.
May be provided. Also in this case, as in the case of the fitting type case 11, it is possible to securely assemble and prevent backlash.

[0016]

As described above, according to the present invention,
A rectangular hole is drilled in a side panel connected to both sides of the top panel, and an upper case half opening at least on the bottom side, and a half formed into a side panel connected to both sides of the bottom panel in which a cone is almost divided into two approximately perpendicular to the bottom surface. A conical protrusion is projected and comprises a lower case half having at least an open upper surface. The side panels are joined to each other in a state where the semiconical protrusion is engaged with the rectangular hole, and the upper case half and the lower case half are joined together. When the side case halves are assembled together, the length of one side of the four sides of the rectangular hole facing the bottom surface of the semiconical projection so that the opening of the rectangular hole partially rides on the conical surface of the semiconical projection. Since the length is smaller than the length of the chord of the bottom surface of the semiconical projection, when the semiconical projection is engaged with the rectangular hole, the opening of the rectangular hole partially rides on the conical surface of the semiconical projection, Of the conic generating line and the rectangular hole In the state where the sides are oblique, the opening of the rectangular hole floats from the side panel by the amount of riding on the semi-conical protrusion, but there is no play in the engagement relationship, and the opening surface of the rectangular hole floats. An elastic force is generated at the base of the side panel in accordance with the height, and the engagement state is stably maintained over a long period of time by the elastic force, so that the upper case half and the lower case half are formed. There is no backlash in the engaged state, and therefore, even in a harsh environment that is constantly subject to vibration from the road surface or the engine room, such as a case for an in-vehicle electronic device, the upper case half and the lower case half can be connected to each other. It does not generate abnormal noise when rubbed, it can sufficiently protect the internal electronic equipment, and the floating height itself is very small, and the side panels are completely joined with almost no gap It is assembled in a state close to the state It is hard to notice that the side panel is floating on the appearance, it does not give a sense of incongruity, and even when assembling the half case, the rectangular hole and the semi-conical protrusion make a clicking sound. Since the side panels only need to be joined and no set screws or the like are required, the assembling work is very easy. Even if the upper case half and the lower case half are separated from each other, the rectangular hole It is sufficient to pry the side panel of the upper case half until one of the four sides facing the bottom surface of the semi-conical projection exceeds the projection height of the semi-conical projection, and after exceeding the projection height of the semi-conical projection, By simply sliding the side panel along the conical surface of the conical protrusion, the case halves can be easily separated from each other, and thus excellent effects such as easy maintenance and inspection of electronic equipment can be obtained.

Further, according to the present invention, a rectangular hole is formed in a side panel of the lower case half, a semi-conical projection is projected from a side panel of the upper case half, and the semi-conical projection is engaged with the rectangular hole. The upper case half and the lower case half are assembled together, so that a rectangular hole is formed in the side panel of the upper case half, and the side of the lower case half As in the case of the fitting type case in which the semi-conical projection is provided on the panel, excellent effects such as reliable assembling and play prevention can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a fitting type case of the present invention.

FIG. 2 is an exploded perspective view of a main part of the fitting type case shown in FIG.

FIG. 3 is an exploded perspective view of the fitting type case shown in FIG.

FIG. 4 is a perspective view showing an example of a conventional fitting type case.

FIG. 5 is an exploded perspective view of a main part of the fitting type case shown in FIG.

FIG. 6 is an exploded perspective view of the fitting type case shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Fitting type case 12 Upper case half 12a Top panel 12b Side panel 13 Rectangular hole 14 Lower case half 14a Bottom panel 14b Side panel 15 Semi-conical projection

Claims (2)

(57) [Claims] A rectangular hole is formed in a side panel connected to both sides of the top panel, and an upper case half opening at least on the bottom side, and a cone formed on the side panel connected to both sides of the bottom panel substantially perpendicular to the bottom. A half-cone projection having a divided shape is protruded, and at least a lower case half having an open upper surface is assembled with each other, and the side panels are joined to each other in a state where the half-cone projection is engaged with the rectangular hole. ,
When the upper case half and the lower case half are assembled, the bottom surface of the semi-conical projection is formed on four sides of the rectangular hole so that the opening of the rectangular hole partially rides on the conical surface of the semi-conical projection. A length of one side facing the base is smaller than a length of a chord of the bottom surface of the semi-conical projection. 2. A lower case half having at least an upper side opened with a rectangular hole formed in a side panel connected to both sides of the bottom panel, and a cone substantially perpendicular to the bottom surface in a side panel connected to both sides of the top panel. A half-cone projection having a divided shape is protruded, and at least an upper case half having an open upper surface is assembled with each other, and the side panels are joined to each other in a state where the half-cone projection is engaged with the rectangular hole. When assembling the lower case half and the upper case half, the opening of the rectangular hole partially rides on the conical surface of the semiconical protrusion, so that the semiconical protrusion of the four sides of the rectangular hole A fit-in type case, wherein a length of one side facing the bottom is smaller than a length of a chord of the bottom surface of the semiconical projection.