JP2000039008A - One-way bolt and one-way bolt set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-way bolt and a one-way bolt set to have a high joining strength between members to be joined despite of structure being simple. SOLUTION: In this one-way bolt 1, a plurality of bolt units 2(1)-2(4) are formed in such a shape that a bolt provided on one end side with a bolt head and on the other side with a male screw part is vertically divided axially of a bolt into a plurality of sections, the bolt units being respectively formed individually independently. At the tip parts on the other end side of the bolt units 2(1)-2(4), grasping bodies 6 are extended axially of the bolt and steps for engagement with a spanner are also formed. One-way bolt set 1S comprises the one-way bolts 1; a nut 16 threadedly engaged with the male screw parts of the integrally combined one-way bolts 1; a plurality of string bodies 17 having ends on one side tied to the respective grasping bodies 6 of the one-way bolts C and a slip-off preventing tool 18 which is formed in diameter larger than that of the female screw hole 23 of the nut 16 and to which the other end of each string body 17 inserted in the female screw hole 23 is tied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, joining a member to be joined and another member to which a hand or the like cannot be inserted into an internal space to tighten the members to be joined only by an operation from a working space. The present invention relates to a unidirectional bolt and a unidirectional bolt set to be joined together.

[0002]

2. Description of the Related Art In general, a one-way bolt is used, for example, when joining a square steel pipe column or the like which cannot be inserted into an internal space and a steel beam made of H-section steel. In particular,
It is widely used when welding work that scatters sparks cannot be performed, as in the case of building renovation work. As this kind of one-way bolt, for example, those disclosed in JP-A-7-331744 and JP-A-10-103327 are known. The one-way bolt disclosed in each publication includes a cylindrical sleeve, a shaft portion that can be inserted into the sleeve cylinder, and has a male thread portion, and a plastic deformation at one end side of the sleeve that is plastically deformed at the time of mounting and has a larger diameter than the through hole. And a nut screwed onto the external thread of the shaft. In these one-way bolts, after inserting the tip of the shaft into the through-holes of the plurality of members to be joined, a nut is attached to the male screw at the end of the shaft and screwed. Then, the shaft portion relatively moves to the distal end side with respect to the sleeve, and presses the sleeve radially outward from the inside of the cylinder with the tapered surface at the tip of the shaft portion, or the sleeve tip portion with the collar portion at the tip of the shaft portion. Press in the axial direction. As a result, the plastically deformed portion at the tip of the sleeve is deformed radially outward and is expanded to have a diameter larger than that of the through hole, so that it functions as a bolt head.

[0003]

However, the conventional one-way bolt has a double-shaft structure of a sleeve and a shaft, and a plastic deformation portion is provided in a part of the sleeve. And the production cost is high. Since the sleeve must be deformed at the time of joining, a large force is required. Also, once attached, the plastically deformed portion of the sleeve is deformed to have a larger diameter than the through-hole, so the one-way bolt could not be pulled out to the working space side and could not be reused. Thereafter, when a greater load is applied to the one-way bolt than at the time of attachment, the plastically deformed portion of the sleeve is further deformed from that state, so that the one-way bolt is loosened and the joining strength between the members to be joined is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made in consideration of the above problem. For the purpose of providing.

[0005]

In order to achieve the above object, a one-way bolt according to the present invention comprises a plurality of bolts having a bolt head at one end and a male thread at the other end in the axial direction of the bolt. The bolt units of the vertically divided shape are formed separately and independently, and at the other end side end of each bolt unit,
The gripper for holding the bolt unit is configured to extend in the direction of the bolt axis.

Further, a stepped portion for engaging a wrench is provided at the tip of the other end of each bolt unit in the above configuration.

In each of the above constructions, an appropriately shaped projection is provided on one bolt head of an adjacent bolt unit so as to project toward the other bolt head, and the other bolt head is fitted with the projection. It is provided with a concave portion having a matching shape.

Further, in each of the above structures, each bolt unit is formed in the same size and the same shape as each other.
The male thread portion of each bolt unit is formed into a thread having a number corresponding to the number of bolt unit divisions.

Further, the one-way bolt set according to the present invention comprises at least one of the above-described one-way bolts, a nut screwed into a male screw portion of the one-way bolt integrally combined, and each grip of the one-way bolt. A plurality of cords each having one end connected to the body, and a stopper which is formed to have a larger diameter than the female screw hole of the nut and to which the other end of each of the cords inserted into the female screw hole is connected. It consists of

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a one-way bolt according to an embodiment of the present invention, FIG. 2 is a rear view of the one-way bolt, FIG. 3 shows a bolt unit of the one-way bolt, and FIG. FIG. 4B is a plan view, FIG.
It is an AA line arrow line figure in (a). In each figure,
Reference numeral 1 denotes a one-way bolt according to this embodiment, which includes, for example, four bolt units 2 (1) to 2 (4). Each of the bolt units 2 (1) to 2 (4)
One end has a bolt head 3 for about 1/4 turn, and the other end has about 1 bolt.
It has a male screw portion 4 for circumference, and is formed separately and independently in a shape in which a general-purpose bolt is vertically divided in the axial direction of the bolt. At the other end of each of the bolt units 2 (1) to 2 (4), a step 8 for engaging a wrench is provided. Square rod mounting grooves 5 are formed inside each stepped portion 8, respectively.

In each rod mounting groove 5, a thin rod-shaped gripping body 6 made of, for example, a steel wire or a copper wire is fixedly provided by welding. Each gripper 6 is a bolt unit 2 (1) to 2
In contrast to (4), they extend in the axial direction of each bolt. Each gripper 6 is attached to the bolt unit 2 (1)
~ 2 (4) for holding in a hollow. The distal end of each gripping body 6 is folded back to form a loop portion 7 for string body insertion.

The remaining bolt units 2 (2) to 2 (4) are provided at the center of the bolt head 3 of the bolt unit 2 (1).
A projection 9 having a rectangular shape in a front view and covering a part of one end face of the projection is projected in the bolt radial direction. Convex part 9 is bolt unit 2
(2) to (4) easily fit into the recesses 10, 10, 10 formed in one end faces of the bolt heads 3 each having a rectangular shape in a front view. Thus, the convex portion 9 and the concave portion 10 have the function of aligning the positions of the bolt units 2 (1) to 2 (4) in the axial direction without erroneously assembling the bolt units 2 (1) to 2 (4).

On one end face of the bolt head 3 and the other end face of the step portion 8 of each of the bolt units 2 (1) to 2 (4), circle numbers (FIGS. 1, 2, 4, 5 Reference) are engraved. The through-hole 12 (or 1) of the member 11 (or 13) through which the one-way bolt 1 is inserted
4), as shown in FIG. 5, is formed with a hole diameter D having a convex portion 9 and allowing the widest bolt unit 2 (1) to pass through.

In actual use, it is convenient to use the one-way bolt set 1S shown in FIG. In this one-way bolt set 1S, each gripper 6, 6, 6,
6 At the loops 7, 7, 7, 7 at the tip,
One end of 7, 17, 17 is passed through and connected, and the string 1
The other end of each of 7, 17, 17, and 17 is passed through the hole of the washer 15 and the female screw hole 23 of the nut 16, and then connected to a washer-shaped stopper 18. That is, one-way bolt 1, washer 15, nut 16, string body 17,
The one-way bolt set 1 </ b> S of the present embodiment is configured by 17, 17, 17 and the stopper 18. However,
The stopper is not limited to the washer-shaped stopper 18 described above, and may be any size as long as it cannot pass through the female screw hole 23 of the nut 16, for example, and adopts a spherical shape, a rod shape, or another shape. You can also.

Next, a description will be given of the joining operation of the joined member 11 and the joined member 13 by the one-way bolt 1. First, the to-be-joined member 11 such as a rectangular steel tube column that cannot be inserted into the internal space 30 and the to-be-joined member 13 such as an H-beam steel beam are overlapped, and the respective through holes 12 and through holes 14 are provided. To match. Therefore, the working space 3
1, the gripper 6 of the bolt unit 2 (1) is held by hand, inserted through the through holes 14 and 12 from the bolt head 3 side, and the portion of the gripper 6 is temporarily placed on the inner peripheral surface of the through holes 14 and 12. I do. Subsequently, the remaining bolt units 2 (2) to 2 (4)
Also, each gripper 6 is sequentially held by hand, and is passed through the through holes 14 and 12 from the bolt head 3 side. At this time, the thin gripper 6 of the bolt unit inserted earlier is
Since only the inside of the bolt unit 12 is occupied, the bolt heads 3 of the remaining bolt units can easily pass through the through holes 14 and 12 without interference.

All bolt units 2 (1) to 2 (4)
After that, the bolt units 2 (1) to 2 (4) are temporarily assembled integrally on the inner space 30 side by operating the gripping bodies 6, 6, 6, and 6. Then, all the grippers 6, 6, 6, 6
Is pulled away from the workpiece 13, the bolt heads 3, 3, 3 are locked at the edges of the through holes 14 of the workpiece 11. In this state, the nut 16 is
The tips of the nuts 6 and 6 are inserted into the female screw holes 23 of the nut 16, and the nuts 16 are screwed into the integrated male screw portions 4, 4, 4 and 4 to fasten the members 11 and 13 to be joined. At this time, when a spanner is attached and fixed to the stepped portions 8, 8, 8, 8 in the combined state, and another spanner is attached to the nut 16 and turned, the one-way bolt 1 is not rotated without idling. Joining members 11, 1
3 can be securely tightened.

When the one-way bolt set 1S is used, the bolt units 2 (1) to 2 (4) are connected to the internal space 30.
After temporarily assembling inside, the stopper 18 or the cord body 17,1
When the bolts 7, 17, 17 are pulled away from the workpiece 13, the bolt heads 3, 3, 3, 3 are locked at the edges of the through holes 14 of the workpiece 11. Thereafter, when the stopper 18 or the like is further pulled, the loops 7, 7, 7, 7 are gathered at the bolt axis. Therefore, the gripping bodies 6, 6, 6, 6 and the male screw portions 3, 3, 3, 3 can be easily inserted into the hole portion of the washer 15 and the female screw hole 23 of the nut 16, so that the assembling workability is improved. I do.

As described above, the one-way bolt 1 of this embodiment can use the high-strength material used for the general-purpose bolt as it is, so that the members 11 and 13 to be joined can be firmly joined. Further, the structure is simple and can be manufactured at low cost. Incidentally, it can be manufactured at a cost of about 1/10 compared with the conventional one-way bolt described above. In mounting, the gripping members 6, 6, 6, 6 are small in diameter and can be handled with one hand.
Bolt unit 2 for through holes 12 and 14
The bolt head 3 of (1) to 2 (4) can be used for the internal space 30 without any trouble.
Side can be inserted. In addition, since the components (for example, the sleeve) are not deformed as in the prior art, a large force for deformation is not required, and the nuts 16 can be easily rotated by simply turning the nut 16 lightly with a spanner or the like.
13 can be joined.

Thereafter, when removing the one-way bolt 1, the nut 16 is first removed, and the bolt units 2 (1) to 2 (2) are held in a state where the grippers 6, 6, 6, and 6 are held together.
(4) The whole is once pushed back into the internal space 30, and the bolt units 2 (1) to 2 (4) are inserted one by one into the through holes 12,
All you have to do is extract from 14. The bolt units 2 (1) to 2 (4) thus removed have no deformed portions and can be reused. Also at this time, in the case of the one-way bolt set 1S, all the strings 17, 17, 1
The nut 16 can be made straight by stretching
The washer 15 and the washer 15 can be easily removed from the holding body 6, and the necessary parts can be prevented from being lost.

Each of the bolt units 2 (1) to 2 (4)
The connection between the gripper 6 and the gripper 6 is not limited to the above-described welding. As shown in FIG. 8, a female screw portion 5 </ b> A provided on the other end surface of a bolt unit (2 (2) is illustrated in FIG. 8) 6 It may be by screwing with a male screw portion 32 provided at the tip. In the case of such a configuration, the gripper 6 can be removed from the bolt unit after the one-way bolt is attached, so that a tool or the like does not get caught on the gripper 6 and the appearance of mounting the one-way bolt is improved.

In the above description, the grip 6 in the form of a round bar has been exemplified. However, the grip in the present invention is not limited to this. For example, as shown in FIGS. The gripper 6a of the example) may be used. In the case of the one-way bolt 1a to which these gripping bodies 6a, 6a, 6a, 6a are applied, since the groove may be cut in a plane, the rod mounting groove 5a can be easily formed. In addition, four grips 6
When a, 6a, 6a, and 6a are bundled, they are in surface contact with each other and are less likely to be displaced, so that they can be easily held together by hand. still,
Although not shown, the grip of the present invention may be a thin plate.

On the other hand, in the one-way bolt shown in FIGS. 11 and 12, the bolt unit 2a and the gripper 6b are configured separately and independently. The bolt unit 2a does not have a spanner engaging step at the other end, and the male screw 4 is formed continuously. The holding body 6b is integrally formed of an inner surface-shaped cap portion 19 which can be detachably fitted to the other end side of the bolt unit 2a, and a rod portion 20 having a string passing hole 22 at the tip. On a part of the inner surface of the cap portion 19, a female screw-shaped screw portion 21 that engages with the male screw portion 4 of the bolt unit 2a is formed. The gripping body 6b may be made of any material, but is preferably obtained by molding using, for example, a synthetic resin as a raw material in terms of manufacturing and cost.

In use, the cap portion 19 of the gripper 6b is fitted to the other end of the bolt unit 2a, and the screw-shaped portion 21 is locked by the male screw portion 4. Thus, the gripper 6
b are used in combination with four bolt units 2a to which b is attached. Therefore, the male screw portions 4, 4, 4, 4 of the integrated one-way bolt are held together with one hand, and each gripping body 6b is detached from each bolt unit 2a with the other hand. Thereafter, the nut 16 is screwed into the male screw portions 4, 4, 4, 4 and tightened.

Each bolt unit is not limited to a unitary bolt formed by vertically dividing a unitary bolt that was originally integrated.
It may be made individually. Further, the number of divisions of the bolt unit forming the one-way bolt is not limited to four as described above, and may be three or five or more.

The projections and recesses of the present invention are exemplified by the one-way bolts 1b shown in FIG. 13 in addition to the projections 9 and the recesses 10 described above. FIG. 13 shows a front cross section near one end face of the bolt head 3 in the one-way bolt 1b. Here, the bolt head 3 of the bolt unit 2 (1)
In addition, a plate-shaped projection 42 having a triangular shape in a front view is protruded toward the adjacent bolt unit 2 (2), and the bolt unit 2
The bolt head 3 of (2) is provided with a triangular groove-shaped concave portion 43 that fits with the convex portion 42. Similarly, the bolt unit 2 (2) and the bolt unit 2 (3) have semi-circular convex portions 44 and concave portions 45, and the bolt unit 2 (3) and the bolt unit 2 (4) have rectangular convex portions. 46 and recess 47
But bolt unit 2 (4) and bolt unit 2 (1)
Is provided with an elliptical convex portion 48 and a concave portion 41 so as to be fitted to each other. According to the one-way bolt 1b, the projections 42, 44, 46, 48 and the recess 4
3, 45, 47, 41 are formed to form a jigsaw puzzle. Therefore, even if the adjacent bolt units are assembled by mistake, they cannot be adhered to each other, so that the combination is wrong. Therefore, the bolt units to be adjacent to each other can be correctly assembled in order only by a simple fitting operation of the convex portion and the concave portion.

Further, the shape of the bolt head of the one-way bolt combining all the bolt units is not limited to the hexagon as described above, as long as it has an outer diameter that cannot pass through the through hole of the member to be joined. , In front view, for example, triangle, square,
It may be a polygon such as a pentagon, a circle, an ellipse, or any other shape. FIG. 14 and FIG.
It is shown in FIG. The one-way bolt 1c shown in the figure is composed of three bolt units 2b, 2b, 2b formed in the same size and in the same shape. Incidentally, the bolt head 3a of the common bolt unit 2b is formed in the shape of a triangular circle when viewed from the front. The male screw portion 4a of each bolt unit 2b is formed as a three-thread screw corresponding to the bolt unit division number X (in this case, X = 3).

Therefore, the three bolt units 2b, 2
When b and 2b are combined, as shown in FIG. 16, in each of the male screw portions 4a, 4a, 4a, the starting point T of the first thread in the first bolt unit 2b (left side in the figure) is set to the next bolt unit 2b (in the figure). At the (center), the starting point T is the third order in the forward order, and in the next bolt unit 2b (right side in the figure), the starting point T is the second order in the forward order. Therefore, when these male screw portions 4a, 4a, 4a are combined, the screw thread does not shift between the bolt units 2b, 2b despite the use of the same unit components. However, the nut is male thread 4
The one having the same number of female screw holes as a is used. With the one-way bolt 1c, only one type of component is required for the bolt unit, which is suitable for mass production and component management. The number of threads Y is, for example, an integer multiple n of the number X of bolt unit divisions (where n is 1), as shown by the formula: Y = nX.
Or an integer greater than or equal to). In this case (X = 3), there are 6 threads, 9 threads,..., And when the bolt unit division number X is 4, 4 threads, 8 threads,.

[0028]

As described above, according to the one-way bolt according to the present invention, the high-strength material used for general-purpose bolts can be used as it is, and the plastic-deformable material is not used. The joining members can be joined and are not easily loosened. Further, the structure is simple and the manufacturing cost is low. When mounting, each gripper can be handled with one hand, and a small-diameter gripper can be temporarily placed and supported in the through-hole of the member to be joined, so that the bolt heads of the remaining bolt units also obstruct the internal space. It can be inserted without. Further, the nut can be turned and joined with a light force without requiring a large force as in the case of the conventional sleeve deformation. After installation, the one-way bolt can be reused simply by removing the nut and pulling out the bolt unit one by one from the through hole.

Also, a wrench can be mounted on the step at the other end of the one-way bolt, and the nut screwed to the male thread can be turned with another wrench, so that it is tightly tightened. Therefore, the members to be joined can be fixed with a strong joining force.

In the case where adjacent bolt heads are provided with a convex portion and a concave portion which can be fitted to each other, the bolt units to be adjacent to each other can be correctly arranged in order by a simple fitting operation of the convex portion and the concave portion. Can be combined.

Further, when a one-way bolt is formed by a common bolt unit having the same size and the same shape as each other, only one kind of component relating to the bolt unit is required. Moreover, the screw pitch of the male screw portion does not shift between the bolt units in the assembled state.

Further, in the one-way bolt set according to the present invention, the bolt unit, the gripping body, and the string body are arranged in a straight line by pulling the string body in the direction of the retaining member, so that the one-way bolt of the one-way bolt is set. Installation work and removal work become extremely easy. Also, the bolt units, nuts, and other necessary parts that are separately configured are not lost.

[Brief description of the drawings]

FIG. 1 is a front view showing a one-way bolt according to an embodiment of the present invention.

FIG. 2 is a rear view of the one-way bolt.

FIGS. 3A and 3B show one of the bolt units constituting the one-way bolt, wherein FIG. 3A is a side view and FIG. 3B is a plan view.

FIG. 4 is a view taken in the direction of arrows AA in FIG. 3 (a).

FIG. 5 is an explanatory view showing a bolt unit inserted into a through hole of a member to be joined.

FIG. 6 is a perspective view showing a one-way bolt set.

FIG. 7 is an explanatory view showing an aspect in which two members to be joined are joined by a one-way bolt set.

FIG. 8 is a plan view showing another mode of connecting the bolt unit and the gripper.

FIG. 9 is a rear view showing a one-way bolt according to another embodiment.

FIG. 10 is a partial perspective view showing a state in which the grippers of the one-way bolt are bundled.

FIG. 11 is an exploded perspective view showing a bolt unit of a one-way bolt and a holding body according to another embodiment.

FIG. 12 is a side view showing the above-described bolt unit and gripper.

FIG. 13 is a sectional view of a bolt head section of a one-way bolt according to still another embodiment as viewed from the front.

FIG. 14 is a front view showing a one-way bolt according to still another embodiment.

FIG. 15 is a perspective view showing a bolt unit forming the one-way bolt.

FIG. 16 is a development view for explaining a male screw portion of the bolt unit.

[Explanation of symbols]

1, 1a, 1b, 1c One-way bolt 1S One-way bolt set 2 (1), 2 (2), 2 (3), 2 (4), 2a, 2b
Bolt unit 3, 3a Bolt head 4, 4a Male screw part 5, 5a Rod mounting groove 6, 6a, 6b Gripping body 7 Ring part 8 Step part 9, 42, 44, 46, 48 Convex part 10, 41, 43, 45, 47 Recess 16 Nut 17 String body 18 Retainer 22 String through hole 23 Female screw hole

Claims (5)

[Claims] 1. A bolt unit having a bolt head having a bolt head on one end side and a male screw part on the other end side is divided into a plurality of vertically divided bolt axial directions, each of which is independently formed. A one-way bolt, characterized in that a gripping body for holding the bolt unit is extended at the other end side in the axial direction of the bolt. 2. The one-way bolt according to claim 1, wherein a stepped portion for engaging a wrench is provided at the other end of each bolt unit. 3. An appropriately shaped protrusion protruding from one of the bolt heads of adjacent bolt units toward the other bolt head, and the other bolt head has a recess fitted with the protrusion. The one-way bolt according to claim 1, wherein the one-way bolt is provided. 4. The bolt units are formed to have the same size and the same shape as each other, and the male screw portion of each bolt unit is formed with a number of threads corresponding to the number of bolt unit divisions. The one-way bolt according to claim 1. 5. A one-way bolt according to any one of claims 1 to 4, a nut which is screwed with an externally threaded part of the one-way bolt integrally combined, and each gripper of the one-way bolt. A plurality of cords, one ends of which are respectively connected to each other, and a stopper which is formed to have a larger diameter than the female screw hole of the nut and to which the other end of each of the cords inserted through the female screw hole is connected. A one-way bolt set characterized by the following: