JPH081283Y2 - Connecting device for housing assembly - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device using bolts and nuts suitable for connecting frame members when assembling a housing for housing control equipment such as electricity or machinery.

[0002]

2. Description of the Related Art Most of electric control equipment, machine control equipment, communication machine control equipment, and the like are installed and installed in a nonflammable box-shaped housing. As a housing for that purpose, a cabinet with a door, which is assembled by attaching a side metal plate to a steel material frame, is used.

By the way, in the conventional processing and assembling of this kind of casing, a welding means or a bolt tightening means is used for joining the frame members, and at the time of the work, the assembling angle of the joining portion is kept by jigs and a scale. , The fixing work was performed under the strain relief of the said part.

[0004]

In manufacturing such a housing, a relatively bulky device such as a welding means is required, and moreover, it takes a lot of work time to obtain an assembling accuracy by using a jig. There were too many difficulties.

Therefore, the present invention aims to develop a connecting device which can assemble a housing in a small space without using welding means and jigs and which can promote labor saving by a short working time. To aim.

[0006]

According to the present invention, one frame plate material of a joint portion is subjected to countersink processing with a machine tool, and a receiving hole matching the countersink portion is opened in a frame plate material to be superposed. We propose a connecting device which is designed to tighten this lap joint by using a countersunk screw that is placed on the countersink side and is inserted through the countersink side and a special nut with a spiral groove formed on the screw hole edge of the pressure contact surface. As a result, it is possible to realize the assembling work in a short time regardless of the size of the housing with the determined angular dimension (sheet metal machine tool accuracy).

[0007]

[Operation] The counter sink processing part of both frame plate materials and the receiving holes that match this at the lap joint are
When the two frame plate members are butted, they function as a hole position aligning action portion by their falling fit.

Next, by tightening with the countersunk screw and the nut, the counter sink processed portion pressed by the shaft head inclined surface of the countersunk screw expands evenly in the receiving hole. As a result, there is no fitting play between the receiving hole and the counter working portion, and the center of the receiving hole and the screw shaft center are automatically aligned to position and fix both plate members.

Then, the lifting portion of the lip of the screw hole to the upper surface of the receiving hole due to the pressure contact deformation of the counter sink processed portion under the tightening can be absorbed in the circumferential groove of the tightening nut.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing a connection state of the device of the present invention in a longitudinal section, FIG. 2 is a front view of a nut used in the device of the present invention in a pressure contact side, and FIG.

In the drawings, reference numerals 1 and 2 denote frame plate members at a joint portion, and one of the frame plate members (for example, the frame on the side of the housing) 1 has a countersink portion 3 previously machined by a machine tool.
The other frame plate material (for example, a ceiling frame or a floor frame) is provided with receiving holes 4 that match the counter sink portions 3, and the counter sink portions 3 are fitted into these receiving holes 4. Reference numeral 5 denotes a countersunk screw whose slanting contact side of the shaft head is inclined, and 6 denotes a nut.

As shown in FIG. 2, the nut 6 has a peripheral groove 7 formed on the edge of the screw hole 8 on the pressure contact surface side, and the peripheral groove 7 has a diameter equal to that of the receiving hole. The groove depth is smaller than the diameter of 4, and the groove depth is about the plate thickness of the frame plate members 1 and 2. Therefore, at the time of tightening, both frame plate members 1 and 2 superposed by screwing and tightening with the dish screw 5
Can be crimped at its joint, and the raised lip of the countersink portion 3 can be accommodated in the circumferential groove 7.

According to the device of the present invention having such a structure, when the casing is assembled, the receiving holes 2 are formed by overlapping the joint portions of the two frame plate members 1 and 2 which have been pre-drilled with each other by visually sliding them. The countersink portion 3 falls into the area, so that the abutting positions of these two frame plate members 1 and 2 can be easily secured.

Next, in this state, the countersunk screw 5 is passed through the screw holes at the matching positions, and the nut 5 is screwed onto the other end of the screw 5 and tightened to tighten the screwhead of the countersunk screw 5. Since the inclined surface is press-fitted into the counter sink portion 3 while being in sliding contact with the counter sink portion 3, the inclined portion spreads the portion 3 in the receiving hole 4,
As a result, the base portion of the counter sink portion 5 is evenly pressed against the edge of the receiving hole 4.

As a result, these counter sync parts 5
And the receiving hole 4 are tightly fitted and fixed to each other without rattling, and at the same time, the countersunk screw 5 is located at the center of the receiving hole 4, that is, the joint position of both frame plate members 1 and 2 is simply the nut 6. By tightening, it is performed automatically with high accuracy.

Due to the expansion deformation of the countersink portion 3 in the receiving hole due to this tightening, the edge of the screw hole may be lifted higher than the plate thickness of the frame plate member 2 on the side where the receiving hole is processed. Since it can be accommodated in the circumferential groove 7 formed on the above-mentioned nut pressure contact surface, the expansion deformation of the counter sink portion 3 can be caused without any trouble, and the nut 6 can be sufficiently tightened.

In this case, it is effective that the fastening device is longitudinally arranged at a plurality of overlapping joining portions of the frame plate material in order to further exert the joining accuracy and secure the mechanical strength.

[0018]

As described above, according to the device of the present invention, a screw hole is provided at the alignment position of the lap joint portion of the frame material, and one of the screw holes is subjected to countersink processing and placed, and the plate screw and the screw hole are provided. Since it is tightened with a nut that has a circular groove formed on the rim, while letting the rising edge part of the screw rim in the counter sink processed part that is spread by the shaft head of the plate screw at the time of assembly escape into the circular groove. Since the nuts can be tightened, the countersink processing part that can be pushed out and spread is evenly expanded, and there is no play between this and the receiving hole for close fitting, and at the same time the center of the receiving hole and the screw shaft center are aligned. It is automatically performed, and the assembling position and the angle of these frame plate members can be secured with high accuracy. As a result, it is possible to assemble a housing made of a frame material in a single time in a space-saving and labor-saving manner without using welding means, jigs and tools, and the device of the present invention is extremely effective in practice. It will be.

[Brief description of drawings]

FIG. 1 is a side view showing a connection state by a devising device in a partially longitudinal section.

FIG. 2 is a front view of a nut used in the devising device.

FIG. 3 is a half-cut side view of a nut used in the devising device.

[Explanation of symbols]

 1, 2 Frame plate material 3 Counter sink processing part 4 Receiving hole 5 Plate screw 6 Nut 7 Circular groove

Claims (1)

[Scope of utility model registration request] 1. A countersink-processed screw hole is provided in one of both frame plate members to be overlapped and joined to each other in a housing frame, and a receiving hole adapted to the countersink processed portion is provided in the other frame plate member. A connecting device for assembling a housing, which is configured to tighten the overlapping joint by a countersunk screw and a nut in which a peripheral groove having a diameter smaller than the diameter of the receiving hole is formed on the periphery of the screw hole of the press contact surface.