JP3994452B2 - Case frame structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a structure in which a base plate and a ceiling plate are attached to a frame corresponding to all ridges of a rectangular parallelepiped housing applied to, for example, a switchboard or a control panel. The present invention relates to a frame structure of a housing that can be produced well and that can reduce manufacturing costs.
[0002]
[Prior art]
The framework structure of a rectangular parallelepiped housing applied to conventional switchboards and control panels can be roughly divided into (1) welding method, (2) bolt (screw) fastening method, (3) adhesion method, etc. Has been produced.
[0003]
[Problems to be solved by the invention]
Each of the three conventional methods has the following drawbacks.
(1) In the method by welding, (1) local heating during welding tends to cause a deviation in dimensions and squareness, and a welding mark that damages the surface is generated. Therefore, mechanical correction and surface finishing correction are performed for correction and removal, but this requires skill and man-hours, (2) poor welding work environment, (3) painting after assembly process by welding Since the process is performed and the size is increased, the transportation cost between processes is increased.
[0004]
(2) Bolt tightening methods are as follows: (1) The deterioration of assembly accuracy due to the gap between the existing bolt and through hole is inevitable. (2) Bolts, washers, spring washers, nuts, etc. Therefore, a complicated torque management is indispensable in order to maintain the work quality related to (3) screw fastening.
(3) The bonding method requires (1) troublesome preparatory work such as fixing jigs for related members and temporary fixing screws for bonding work, and (2) troublesome preparation and supply of adhesive. It requires a certain curing time, and it is troublesome to remove the protruding adhesive, and (3) a design for taking an adhesive area is required.
[0005]
In short, what can be said in common with the conventional method is that the assembly accuracy (dimensions, squareness) of the framework is poor and the correction work is generally difficult, and as a result, the assembly accuracy remains slightly worse and the product quality is lowered. It is necessary to increase the overall cost by requiring a high level of skill of the worker and a large number of work steps for the correction.
The problem to be solved by the present invention is to solve the above problems of the prior art, and to provide a frame structure of the housing which can improve the assembly accuracy of dimensions and squareness and can reduce the production cost. There is.
[0006]
[Means for Solving the Problems]
The present invention is a structure in which a base plate and a ceiling plate are attached to a skeleton corresponding to all the ridge lines of a rectangular parallelepiped housing, each having the same rectangular base frame and ceiling frame, and the base frame and the ceiling frame, respectively. Comprising four pillars that connect the corresponding corners of each other, and corner pressing tools that are rivet-fastened to the ends of the pillars,
Pillars, in its cross-section is hollow rectangular plate member Der form a rectangular tube body to a predetermined intermediate position is deleted in the sides connecting thereto comprise the corners of the inside is, and the edge Grooves are formed on the ceiling frame side and the base frame side,
Each of the base frame and the ceiling frame is formed by integrally forming a rectangular plane portion as either the base plate or the ceiling plate and an L-shaped folded portion connected to each side portion thereof. Only the folded part of the part is a plate-like member that is deleted in a square shape corresponding to the cross section of the column , and projections are formed at each corner of the folded part,
Corner pusher at each end of the column, minutes legs of the L-shaped contact with the surface of the two sides of the inner, base frame, roof frame each folded portion extending perpendicularly from each end Is a two-stage L-shaped plate- like member formed integrally with a flat surface portion in contact with the bottom surface of
In the contact part between the pillar and the corner pressing tool, an embossing part for positioning is formed respectively, and a hole for penetrating the rivet is provided there, and formed at each of the two edges related to the deleted part of the pillar . The base frame and the ceiling frame are respectively fitted by fitting the grooves and the projections of the folded portions of the base frame and the ceiling frame, respectively, and rivet fastening the L-shaped leg portions of the corner pressing tool to the ends of the columns. Is characterized in that it is clamped and fixed by a corner pressing tool and a pillar.
[0007]
In the present invention, it is preferable that the corner pressing tool is a plate member having a high rigidity structure, for example, a plate member having a thick plate thickness or provided with a bending portion or a rib for reinforcement.
Therefore, in the present invention, the end portions of the four pillars are fitted into the deleted portions (hollow portions) of the respective corner portions of the base frame and the ceiling frame, and the two edge portions related to the deleted portions of the columns are provided. The base frame and the ceiling frame are fitted into the folded portions, for example, by inserting the edge into the groove. Next, by rivet fastening the corner pressing tool to the pillar, the base frame and the ceiling frame are clamped and fixed between the positioned corner pressing tool and the pillar, and the squareness of the base frame and the ceiling frame and the pillar is accurately adjusted. Can be put out well. Here, when the corner pressing tool is a plate-shaped member having a high rigidity structure, the elastic deformation is suppressed, so that it is possible to support the accuracy of the squareness.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the drawings. First, the overall appearance of the embodiment will be described with reference to FIG. In FIG. 5, this embodiment is a framework corresponding to all ridges of a rectangular housing applied to, for example, a switchboard or a control panel, that is, the opposite portions of the folded portions (frames) 22 and 23 of the base frame 20. 4 in total, 4 in total including the opposing parts of the folded parts (frames) 32,33 of the ceiling frame 30, and 4 of the pillars 10, and the lower plane part (base plate) 21 And the upper plane part (ceiling board) 31 is attached.
[0009]
FIG. 1 is a perspective view of a main part (A part of FIG. 5) of the embodiment, and FIG. 2 is a plan view of the main part of the embodiment. Here, the lower end of the column 10, one corner on the near side of the base frame 20, and the corner pressing tool 40 are representatively shown, but the ceiling frame 30 has the same configuration. This frame structure includes a rectangular base frame 20, a ceiling frame 30 (not shown) (see FIG. 5), four columns 10 connecting the corresponding corners, and upper and lower columns 10 respectively. The corner pressing tool 40 is rivet-fastened with the end portion.
[0010]
The column 10 is a plate-like member having a substantially rectangular cylinder whose cross section is a hollow square and from the inner corner to a predetermined intermediate position of the long side on the far side. Generally speaking, the base frame 20 is a plate-like member having a shape in which an L-shaped frame portion is connected to each side portion of a square planar portion. Specifically, a rectangular planar portion (base plate) 21 and L-shaped folded portions (frames) 22 and 23 (also on opposite sides) connected to each side portion are integrally formed, In addition, only the folded portions 22 and 23 at the corners of the plane portion 21 are deleted in a square shape corresponding to the cross section of the column 10. In addition, a protrusion 24 and a slit-like groove 25 are formed in each of the folded portions 22 and 23 adjacent to the deleted portion.
[0011]
The corner pressing tool 40 includes an L-shaped portion 41 that is in contact with the inner two surfaces at each end portion of the column 10, and each folded portion 22, 23 of the base frame 20 that extends perpendicularly from each end portion. This is a two-stage L-shaped plate-like member integrally formed with the flat portions 42 and 43 that come into contact with the bottom surface (see FIG. 2). In order to give rigidity to the corner pressing tool 40, the plate thickness is made thicker than that of the other columns 10 and the base frame 20, and the L-shaped portion 41 and the flat portions 42, 43 are bent to reinforce against pressing. The parts 46, 47, and 48 are integrally attached.
[0012]
Each of the contact portions between the pillar 10 and the corner pressing tool 40 is formed with an embossing portion for positioning, and a hole for penetrating a rivet is provided there. That is, the column 10 has two pairs of the embossed portion 14 and the hole 14a, the embossed portion 15 and the hole 15a, respectively, on the short side portion on the far side and the left portion removed on the long side portion on the left side. Corresponding to this, two sets of the embossed portion 44 and the hole 45a are formed on each leg portion of the L-shaped portion 41, and two sets of the embossed portion 44 and the hole 44a, respectively. Two sets of sets are formed. In FIG. 2, in this embodiment, only the long side portion is deleted from the corner inside the pillar 10 and the short side portion is not deleted. In other words, the deletion of the short side portion is stopped up to the position of the corner. . This is a design problem because, when the short side portion is deleted, a length necessary for rivet fastening described later cannot be taken to the short side portion. In short, since it is the eye that the edges necessary for fitting, which will be described later, are formed on the long and short sides by deletion, in general, a predetermined middle of each of the long and short sides including the inner corner is connected. The position is deleted.
[0013]
The assembly of the above members is performed as follows. First, the grooves 18 and 19 are formed in advance on the two edges 11 and 12 of the column 10, and the edges 11 and 12 are connected to the folded portions 22 and 22 of the base frame 20 at the positions of the grooves 18 and 19, respectively. 23 are fitted into the projections 24 and the grooves 25 formed in 23, respectively, and so-called fitting coupling is achieved. Next, the corner pressing tool 40 is moved in the direction of the arrow from the solid line position to the broken line position, the embossed portions corresponding to the pillars 10 are fitted and positioned, and the rivet 50 is penetrated through the common hole and the rivet is fastened. (Refer to part B in FIG. 2). By fastening the rivet, the base frame 20 is clamped and fixed by the corner pressing tool 40 and the column 10 positioned by fitting the embossed portions, and at the same time, the squareness of the column 10 with respect to the base frame 20 is improved with high accuracy. Can do. This rivet fastening will be described later in detail.
[0014]
The rivet fastening will be described with reference to FIG. 3 and FIG. FIG. 3 is a cross-sectional view of the rivet fastening location (B portion in FIG. 2) before fastening, and FIG. 4 is a cross-sectional view of the rivet fastening location after fastening. In FIG. 3, for rivet fastening, a set of a rivet 50 and a fastening auxiliary material 51 penetrating the rivet 50 is used as a fastening unit, and a dedicated fastening tool (not shown) is used. The rivet 50 is an integral structure composed of a round head and a body, and a through hole is formed in the axial direction thereof. The auxiliary member 51 has an integral structure including a cylindrical right end portion having the same diameter as the body of the rivet 50 and a shaft portion having a slightly smaller diameter on the left side, and the shaft portion penetrates the rivet 50 to constitute one unit. With the auxiliary material 51, a slope is formed at a step portion between the right end portion and the shaft portion. The slope at the right end is just a chamfer. Now, the fastening unit composed of the rivet 50 and the auxiliary material 51 is inserted into the coaxial holes 15a and 45a from the left side of the corner pressing tool 40 and the column 10 which are positioned by fitting the embossed portions 15 and 45 together. Penetration (before drawing).
[0015]
In FIG. 4, while pressing the head of the rivet 50 against the left side surface of the corner pressing tool 40 with a fastening tool (not shown), the auxiliary member 51 is gripped by the left shaft portion and pulled to the left, The right end of the body of the rivet 50 is pushed outward through the left slope, and at the same time, the portion remaining on the back side of the auxiliary member 51 is enlarged and caulked to fasten the corner pressing tool 40 and the column 10. After completion of the fastening, the shaft portion of the auxiliary material 51 protruding to the left from the head of the rivet 50 is cut and removed, and the right end portion of the auxiliary material 51 remains pressed together with the caulking portion of the rivet 50 to be in the state shown in the figure.
[0016]
【The invention's effect】
According to the present invention, there are the basic effects that the assembly accuracy of dimensions and squareness can be improved and the manufacturing cost can be reduced. The reason is that the members machined with high precision are assembled at room temperature by fitting and rivet fastening. That is, each end of the four pillars is fitted into the hollow part of each corner of the base frame and the ceiling frame, and the two removed edges of the pillars are turned portions of the base frame and the ceiling frame, respectively. The base frame and the ceiling frame are then clamped and fixed by the corner pressing tool and the column that are accurately positioned via the embossed portion by rivet fastening the corner pressing tool to the column. Therefore, assembling accuracy of dimensions and squareness can be improved as it is, and no correction work is required, so that a high degree of skill of the operator and a large number of work steps are not required, and the production cost can be reduced. Moreover, the improvement of an assembly precision is supported by making a corner presser into a highly rigid structure.
[0017]
As another incidental effect, the surface of each member is pre-finished by painting, plating, etc., and it is transported to the assembly work place in the state of that member. Therefore, unlike the transport in the conventional assembly state, there is a risk of surface damage due to transportation. And the transportation cost between processes is reduced. In addition, since there is no troublesome work management welding, bolt (screw) fastening, or bonding with an adhesive, there is less variation in quality due to operator skill (stabilization of quality).
[Brief description of the drawings]
FIG. 1 is a perspective view of an essential part of an embodiment according to the present invention. FIG. 2 is a plan view of an essential part of the embodiment. FIG. 3 is a cross-sectional view of a rivet fastening point before fastening. Cross-sectional view after [Fig. 5] Perspective view of the embodiment [Explanation of symbols]
10 Pillars 11 and 12 Edge portions 14 and 15 Embossed portions 14a and 15a Holes 18 and 19 Groove 20 Base frame 21 Plane portion (base plate)
22, 23 Folded part (frame)
24 Projection 25 Groove 26 Deletion part 30 Ceiling frame 31 Plane part (ceiling board)
32, 33 Folded part (frame)
40 corner pressing tool 41 L-shaped portion 42, 43 flat portion 44, 45 embossed portion 44a, 45a hole 46, 47, 48 bent portion 50 rivet 51 auxiliary material

Claims (1)

A base plate and a ceiling plate are attached to the framework corresponding to all the ridge lines of the rectangular parallelepiped housing, and each of the base frame and the ceiling frame having the same rectangular shape and the corresponding one of the base frame and the ceiling frame, respectively. Four pillars that connect the corners, and a corner pressing tool that is rivet-fastened to each end of the pillar,
Pillars, in its cross-section is hollow rectangular plate member Der form a rectangular tube body to a predetermined intermediate position is deleted in the sides connecting thereto comprise the corners of the inside is, and the edge Grooves are formed on the ceiling frame side and the base frame side,
Each of the base frame and the ceiling frame is formed by integrally forming a rectangular plane portion as either the base plate or the ceiling plate and an L-shaped folded portion connected to each side portion thereof. Only the folded part of the part is a plate-like member that is deleted in a square shape corresponding to the cross section of the column , and projections are formed at each corner of the folded part,
Corner pusher at each end of the column, minutes legs of the L-shaped contact with the surface of the two sides of the inner, base frame, roof frame each folded portion extending perpendicularly from each end Is a two-stage L-shaped plate- like member formed integrally with a flat surface portion in contact with the bottom surface of
In the contact part between the pillar and the corner pressing tool, an embossing part for positioning is formed respectively, and a hole for penetrating the rivet is provided there, and formed at each of the two edges related to the deleted part of the pillar . The base frame and the ceiling frame are respectively fitted by fitting the grooves and the projections of the folded portions of the base frame and the ceiling frame, respectively, and rivet fastening the L-shaped leg portions of the corner pressing tool to the ends of the columns. Was fixed with a corner pressing tool and a pillar.
The frame structure of the housing | casing characterized by the above-mentioned.

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