JP3190000B2 - Back nut mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a bolt hole formed on a side surface of a beam mainly composed of an H-section steel or a channel steel, for joining an end of the beam perpendicular to the beam. The present invention relates to a back nut mounting device which is provided in advance so as to be adapted to the above.

[0002]

2. Description of the Related Art Generally, when joining a member with a bolt and a nut, if it is difficult to attach the nut to the back side of the bolt hole, the nut is fitted to the bolt hole in advance. . Conventionally, as a method for mounting such a nut, there are a method of fixing by welding and a method of mounting with a metal fitting.

[0003]

In the above-mentioned conventional mounting structure, in the case of fixing by welding, not only the welding itself is troublesome, but also it is necessary to perform welding while moving to each part of the long beam. Therefore, there is an inconvenience that the work time becomes longer.

[0004] On the other hand, in the case of using a metal fitting, a special structure for mounting the metal fitting is required, and also, work for mounting the metal fitting is required. In particular, at the joint between beams, a column or a frame is fixed to the beam, and two types of mounting of a bolt for fixing the frame and the like and mounting of a bracket for a back nut are provided. There are drawbacks that require work.

The present invention solves the above-mentioned drawbacks of the prior art, and allows a back nut to be attached to a side surface of a beam or the like to be easily attached in a short time and to position the nut with a bolt hole of the beam or the like. The purpose is to make sure that

[0006]

In order to solve the above-mentioned problems, according to the present invention, there is provided a metal fitting for attaching a back nut to a side surface of a web of an H-shaped or grooved steel material, the metal fitting being provided along the side surface of the web. The upper end of the metal fitting body made of an elastic plate is bent in the horizontal direction to form a mounting piece, and the tip of a through bolt attached across the upper and lower flanges of the steel material penetrates the mounting piece and passes through the mounting bolt. It is fixed to the lower surface of the upper flange with a screwed nut, and the tip of an elastic tongue formed by cutting and raising the metal fitting body comes into contact with the through bolt, and the metal fitting body is pressed toward the web side by the elasticity of the tongue piece. It is characterized by becoming.

In the above, the annular projection formed around the screw hole of the back nut is inserted into the bolt hole of the metal fitting body, and the tip of the projection is expanded outward in the diameter so as to be held so as not to come off from the bolt hole. It is possible. At this time, it is conceivable that the bolt hole is formed to be a long hole in the longitudinal direction, and the back nut is movable along the long hole.

[0008]

The bolt mounted between the flanges of the beam or the like can be used for mounting a frame or the like to the beam or the like, and a metal fitting can be mounted simultaneously with the mounting of the bolt. Further, since the metal fitting body always acts to press against the side surface of the beam by its elastic tongue, the back nut attached to the metal fitting body can be reliably positioned. In addition, since the metal fitting is supported by being suspended from the upper flange of the beam, the same metal fitting can be used regardless of the vertical dimension of the beam. At this time, if the back nut is made freely movable in the vertical direction as described above, it is possible to cope with a difference in the position of the bolt hole.

[0009]

1 is a perspective view of a metal fitting according to the present invention, and FIG.
The state of attachment is shown. In the drawing, (1) is a through bolt for fixing the shaft assembly (2), and as shown in FIG. 4, a male screw portion (3) is formed at the upper end thereof. Further, a tapered tip portion (4) for facilitating insertion into the bolt hole is formed integrally with the tip portion of the male screw portion (3). Further, a nut (6) for fixing to a beam (5) made of H-section steel is screwed into the male screw portion (3). On the other hand, one end of a long nut (8) is screwed into a male screw portion (7) formed at the lower end of the through bolt (1), and a screw hole ( An annular projection (10) is integrally formed around 9).

As shown in FIG. 5 and subsequent figures, the frame (2) has a structure in which a horizontal frame (12) composed of C channels and a vertical frame (13) are joined in a rectangular frame shape. ) At the end of the above beam (5)
A bolt hole (15) corresponding to the bolt hole (14) is formed (FIG. 2).

(17) The end of the beam (18) perpendicular to the beam (5) to which the through bolt (1) is attached is connected to the beam (5).
FIG. 3 shows a metal fitting of the present invention for attaching a back nut (19) to the side surface of the beam (5) for joining to the side surface of (5). This bracket
(17) is made of a thin metal plate having elasticity, and its upper end is bent horizontally to form a mounting piece (21).
In (1), bolt holes (24) and (24) are formed in conformity with the bolt holes (14) and (14) formed in the upper flange (22) of the beam (5). Furthermore, the vertical bracket body (25) has a vertically elongated slot-like bolt hole (28) corresponding to the bolt hole (27) (27) ... of the web (26) of the beam (5). (28) are formed. As shown in FIG. 3, the back nut (19) has an annular projection (30) formed on its back surface along the periphery of the screw hole (29) of the nut (19). It is inserted movably in the up and down direction into the slot-shaped bolt hole (28), and also has a protrusion (30).
Is expanded outward in the diameter direction and held so as not to come off.

Further, at a substantially middle part in the vertical direction of the metal fitting body (25), the left and right ends of the metal fitting body (25) are inclined obliquely to the same side as the back nut (19) through L-shaped cuts. Elastic tongue pieces (32) (32) are formed. Further, on both upper and lower sides of the tongue piece (32), both ends in the left and right direction of the bracket main body (25) are bent at right angles to the surface side on which the nut (19) is attached to form a detent piece (31), This detent piece (3
1) The side surface of the nut (19) abuts, and the nut (19) is held so as not to rotate.

In the above structure, first, the back nut mounting bracket (17) is set so that its main body (25) is on the web (26) side, and the upper mounting piece (21) is attached to the beam (5). ) Abuts against the lower surface of the flange (22) on the upper side, and the bolt holes (24) are aligned with the bolt holes (14) of the flange (22), and the upper end of the through bolt (1) is connected to these bolt holes (14). 14) After the insertion into (24), the protrusion (10) at the tip of the long nut (8) is also inserted into the bolt hole (23) of the lower flange (22). In this state, the fixing nut (6) screwed into the male screw part (3) at the upper end of the through bolt (1) is rotated to set the back nut mounting bracket.
The fixing piece (21) of (17) is fastened and fixed to the upper flange (22). At this time, the back nut (19) is moved up and down so as to match the bolt hole (27) of the web (26). At this time, the tip of the elastic tongue (32) cut and raised from the bracket body (25) abuts the side surface of the through bolt (1), and the tongue (3)
The resilient force of 2) presses the bracket body (25) toward the web (26), whereby the back nut (19) is pressed against the web (26) and held so as not to move from the positioned position. I have.

On the lower flange (22) side, the upper horizontal frame (12) of the lower shaft assembly (2) is attached to the lower surface of the flange (22).
And the bolt (33) inserted from below into the bolt hole (15) of the horizontal frame (12) passes through the bolt hole (23) of the flange (22) into which the annular projection (10) is inserted. Then, the horizontal frame (12) is fixed by screwing into the long nut (8) and tightening. At that time, the anti-rotation piece (20) projecting from the side surface of the long nut (8) abuts on the web (26) or the metal fitting (17) to prevent the rotation. On the other hand, the male screw portion (7) projecting upward from the upper flange (22) is provided with a bolt hole of the lower horizontal frame (12) in the frame (2) installed on the beam (5).
(15), the nut (34) screwed to the tip is fastened, and the upper shaft assembly (2) is fixed.

After attaching the bracket (17) as described above, the bolt (36) inserted into the end plate (35) at the tip of the beam (18) in the perpendicular direction shown in FIG. The beam (18) is attached by screwing into the beam.

[0016]

As described above, according to the present invention, the metal fitting for holding the back nut is fixed by the through bolt attached to the beam or the like. Because it can be used for fixing, special bolts for attaching metal fittings are not required, and metal fittings are attached at the same time as the bolts are attached. Also, the number of working steps is reduced, and the mounting time is shortened.

Further, the metal fitting body is securely pressed against the web side of the beam by the elastic tongue piece abutting on the through bolt, so that the back nut can be securely positioned without leaving the bolt hole of the web. There is.

In addition, since the above-mentioned metal fitting is attached to the upper flange of the beam in a suspended state, the same metal fitting can be used even when the vertical dimension of the beam is different.

At that time, in the invention of claim 3 of this application,
Since the back nut can be moved up and down within the range of the elongated hole, it can be moved according to the difference in the position of the bolt hole in the beam, so the same bracket is used even if the position of the bolt hole is different in this way There is an effect that can be done.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fitting according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state where the metal fitting is attached to a beam.

FIG. 3 is an enlarged longitudinal sectional view showing a back nut mounting portion.

FIG. 4 is a perspective view of a through bolt.

FIG. 5 is an exploded perspective view of a mounting portion of a fitting.

FIG. 6 is a perspective view of the same mounting state.

[Explanation of symbols]

 (1) Through bolt (2) Shaft assembly (3) Male thread (5) Beam (6) Fixing nut (17) Fixing bracket (18) Beam (19) Back nut (21) Mounting piece (22) Flange (24 ) Bolt hole (25) Bracket body (26) Web (27) Bolt hole (28) Bolt hole (29) Screw hole (30) Annular protrusion (32) Elastic tongue

Claims (3)

(57) [Claims] 1. A metal fitting for attaching a back nut to a side surface of a web of an H-shaped or grooved steel material, wherein a metal body upper end composed of an elastic plate installed along the side surface of the web is bent in a horizontal direction and mounted. The tip of a through bolt attached across the upper and lower flanges of the steel material penetrates the mounting piece and is fixed to the lower surface of the upper flange with a nut screwed to the through bolt. An apparatus for fixing a back nut, wherein a tip of an elastic tongue formed by cutting and raising a metal fitting body comes into contact with the through bolt, and the metal fitting body is pressed toward the web by the elasticity of the tongue piece. 2. An annular projection formed around the screw hole of the back nut is inserted into a bolt hole of the bracket body, and the tip of the projection is expanded outward in a diameter direction to hold the bolt so as not to come off from the bolt hole. The mounting device for a back nut according to claim 1, wherein: 3. The back nut mounting device according to claim 2, wherein the bolt hole is a long hole, and the back nut is movable along the long hole.