JPS5833747Y2 - framework structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a framework structure that is most suitable for application to, for example, various frames and various chassis of various electronic devices.

2. Description of the Related Art Conventionally, a framework structure in which four members made of sheet metal are assembled into a rectangular shape has been implemented as a chassis of various electronic devices.

By the way, the conventional framework structure of this kind has a structure in which the four members mentioned above are fastened together using screws, etc., but this requires a large number of fastening parts such as screws, and it takes a lot of time to work on the framework. The cost was high.

In addition, self-tapping screws are usually used for fastening, but due to the twisting effect caused by the fastening torque, torsion occurs in the structural surfaces of the chassis etc. after the framework is assembled.

Furthermore, the fastening structure using screws is easily deformed by external force.

Therefore, in order to correct the above-mentioned defects, two of the four members
A framework structure has been proposed in which three parts are fitted together and the remaining few parts are fastened with screws or the like.

However, this type of conventional framework structure has a problem with the above-mentioned fitting structure, and is weak against external forces, so it also has the defect that it is easily deformed by external forces after fastening.

The present invention has been devised in view of the above-mentioned circumstances, and aims to provide a very simple frame structure, which is difficult to deform due to external force after fastening, and is extremely robust.

An embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 1 shows the entire framework structure, which includes four members 1, 2, 3, .
4 are assembled into a rectangular shape to construct a desired frame, chassis, etc.

At this time, the above four members 1 to 4 are located at three locations 5, 6.
7 are fastened in a fitting structure, and the remaining one point 8 is fastened in a screw fastening structure using one screw 9, which is a self-tapping tap screw.

Next, details of the fastening portion 5 with the fitting structure will be explained.
The fastening portions 6 and 7 having other fitting structures also have similar structures.

First, FIGS. 5 to 7 show one end of the first member 1. The first member 1 has a substantially U-shaped cross section, and a pair of protrusions 11 are provided at the end. They are integrally molded parallel to each other.

These face protrusions 11 are inclined on one side with respect to the longitudinal direction of the first member 1 at a predetermined inclination angle θ, and on one side of the root portion 12 of the face protrusion pieces 11 on the inside of the inclination, Almost L
A retaining surface 13 having a letter shape is provided.

Further, an abutment surface 14 that is perpendicular to the longitudinal direction of the first member 1 is provided at the end of the first member 1 opposite to the root portion 12 of the surface projection piece 11 .

A notch 15 having an inclination angle θ2 substantially perpendicular to the inclination direction is provided at the end of the first member 1 on the inclination direction side of the surface projection piece 11.

Next, FIGS. 2 to 4 show one end of the second member 2, and this second member 2 also has a U-shaped cross section.
At its end, a pair of slits 17 for engaging the surface protruding pieces 11 are provided parallel to each other along the longitudinal direction of the second member 2.

By the way, at the base 12 of the surface projection piece 11, the contact surface 14
The side end surface is formed into a circular arc surface 18 having a radius R centered on the root point P of the root portion 12 on the side of the engagement surface 13.

Then, this radius R and the width 11 of the base portion 12 of the surface projection piece 11
The relationship between the maximum diameter 13 of the protrusion 11 other than the base 12 and the length 12 of both the slits 17 is 13<11-
R≧12.

Further, the retaining surface 13 in the longitudinal direction of the first member 1
The relationship between the gap t1 between the contact surface 14 and the thickness t2 of the second member 2 is determined as t1≦t2.

Further, the maximum height h of the arcuate surface 18 with respect to the abutment surface 14 is determined to satisfy the relationship tl<h.

Next, the fastening part 5 with the fitting structure configured as above
Explain the fastening order.

First, the surface projection pieces 11 are inserted into both slits 17 as shown in FIG.

At this time, the first member 1 and the second member 2 are faced in the direction in which the inclination angle θ1 becomes zero, and the surface projection piece 11 is moved from the direction of arrow A.
into both slits 17.

Further, at this time, the notch 15 having the inclination angle θ2 serves as a relief allowance during the insertion.

Next, in the inserted state, for example, the first member 1 is rotated by an inclination angle θ1 in the direction of arrow B with respect to the second member 2.

Note that at this time, the first member 1 is rotated about the root portion P with respect to the second member 2.

When it is rotated by the inclination angle θ1, the base portion 12 of the surface projection piece 11 is guided by the arcuate surface 18 and enters into both slits 17 as shown in FIG.

At the same time, the engaging surface 13 of the surface projecting piece 11 and the contact surface 14 of the first member 1 are brought into contact with the outer surface 19 and inner surface 20 of the second member 2 at both ends of both slits 17. The second member 2 is clamped and fixed between the retaining surface 13 and the contact surface 14 from both sides thereof.

However, when levering, the R of the circular arc surface 18 of the surface projection piece 11 has a wedge effect, and in the above-mentioned fitted state, it becomes 11-12 and the first
The backlash between the member 1 and the second member 2 becomes zero.

If an external force is applied to these members 1 and 2 after they are fastened, the engaging surface 13 and the contact surface 14 will strongly receive the force as a tensile force and a compressive force in the longitudinal direction of the first member 1. The external force causes the face protrusion piece 1 to stop.
1 does not change at all.

Therefore, after fastening, they are firmly fastened in a state that is difficult to deform into a diamond shape or the like due to external force, and a very robust framework is constructed.

In this frame structure, as shown in FIGS. 10 and 11, the pair of end surfaces 22 of the first member 1 and the pair of end surfaces 23 of the second member 2 are auxiliarily butted against each other. This makes it possible to more firmly prevent deformation due to external forces after fastening.

Also, in this framework structure, as mentioned above, there are four members 1 to 4.
The three locations 5, 6, and 7 are fastened using the above-mentioned fitting structure, and the remaining location 8 is fastened with a set screw 9, as shown in FIG. With the three fitting structures 5, 6.7 completely fastened together with no backlash as described above, the third member 3
A clamping margin is provided between the fourth member 4 and the fourth member 4 by a gap 25, and this clamping margin is fastened with a set screw 9.

Therefore, the four members 1 to 4 are fastened at all of their four fastening portions 5 to 8 with completely no looseness, and an extremely strong square framework is constructed.

Moreover, at this time, the screws shown in FIGS. 12 and 13 are
As shown in the figure, the third member 3 and the fourth member 4 each have a substantially U-shaped cross section, and the end of the third member 3 is bent inward in a direction perpendicular to its long direction. The protruding piece 27 thus made is inserted between the pair of opposing pieces 28 of the fourth member 4 to the full width thereof.

Then, insert the stop screw 9, which is a self-tapping tap screw, through the insertion hole 29 provided in the fourth member 4 into the protruding piece 27.
A structure is adopted in which the tap is screwed into the tap hole 30 provided in the tap hole 30 and fastened.

According to this structure, the protrusion 2 due to the fastening torque of the set screw 9
Since the twisting of the frame 7 can be strongly suppressed (prevented) by both opposing pieces 28, no twisting occurs on the constituent surface after the framework is assembled, and the constituent surface becomes exactly flat.

According to the present invention, as described in the embodiments above, fitting is extremely easy, framework work can be performed extremely easily and highly efficiently, and moreover, it is possible to connect extremely firmly with no backlash. This has the advantage that it is difficult to deform due to external force after being fastened, and a very robust framework can be constructed.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view of the entire framework, Fig. 2 is an enlarged plan view of the end of the second member, and Fig. 3 is a plan view of Fig. 2 III- Sectional view along line III, No. 4
The figures are a sectional view taken along the line X-X in FIG. 9, FIG. 5 is an enlarged plan view of the end of the first member, FIG. VII line sectional view, Figures 8 and 9 are enlarged plan views of main parts showing the fastening order, Figure 10 is Figure 9
- An X-ray cross-sectional view, Figure 11 is a cross-sectional view taken along the line M-XI in Figure 9, Figure 12 is an enlarged cross-sectional view taken along the line M[-n in Figure 1, and Figure 13 is an enlarged cross-sectional view taken along the line ■-■ in Figure 1. FIG. In addition, in the symbols used in the drawings, 1...first member, 2...second member, 11...protrusion, 12...protrusion Base of 13...
Engagement surface, 14...Abutment surface, 17...Slit, 19...Outer surface of second member, 20...
...This is the inner surface of the second member.

Claims (1)

[Scope of utility model registration request] It consists of a first member having a pair of protrusions integrally molded at its end, and a second member having a pair of slits along the longitudinal direction for engaging the face protrusion at its end. The piece is inclined to one side with respect to the longitudinal direction of the first member, and
A retaining surface forming a substantially main shape is provided on one side of the base of the face protrusion piece on the inside of the slope, and an abutment surface is provided on the end of the first member, which is on the opposite side of the base of the face protrusion piece. , the relationship between the width 11 of the base of the surface projection piece and the length 12 of both the slits is determined to be 11≧12, and the relationship between the engagement surface and the abutment surface in the longitudinal direction of the first member is The relationship between the gap t1 and the thickness t2 of the second member is determined to be t1≦t2, and the first member and the second member are relative to each other with the surface protrusion piece inserted into both the slits. By rotating the face protrusion piece to a predetermined angle, the base of the face protrusion piece is inserted into both slits I, and the engaging surface of the face protrusion piece comes into contact with the first member at both ends of the slits. A framework structure configured to sandwich and fix the second member from both sides between the contact surface and the contact surface.