JPH11351220A - Flat head bolt having idling preventive mechanism, and structure and method for tightening wood with other material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a bolt from idling in tightening/loosening a nut even when any jig such as a wrench or a screw driver is not used. SOLUTION: A wood side fitting hole 5 is aligned with a cargo side fitting hole 9, a flat head bolt 11 is pierced into both holes 5, 9 from a load wood 3, a flat head part 12 is abutted on the load wood 3, and a hexagon nut 20 is screwed to a threaded part 16 of a shaft part 14. The hexagon nut 20 is tightened by a jig 72 while preventing the flat head bolt 11 from idling by biting an idling preventive projecting part 17 into the load wood 3, the whole flat head part 12 is bitten into the load wood 3 by the tightening effect and the pressing effect of a conical bearing surface 13 so as not to be projected downward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a countersunk bolt with an anti-spin mechanism and a fastening structure and a fastening method for wood and other materials using the countersunk bolt.

[0002]

2. Description of the Related Art When a load is carried by a forklift (or other cargo handling equipment such as a hand lift), the load is fastened to a pallet and a fork of the forklift is inserted into a fork insertion space of the pallet. I do. As a conventional fastening structure between a pallet 1 and a leg 8 of a load, a fastening structure shown in FIG. 5 is generally used.

As shown in FIGS. 5 (a) and 5 (b), the wood-side mounting hole 5 formed in the load wood 3 of the pallet 1 and the load-side mounting hole 9 formed in the leg 8 of the load are aligned. A hexagon bolt 51 is passed through the wood-side mounting hole 5 and the luggage-side mounting hole 9 from the load wood 3, and the hexagonal head 52 of the hexagon bolt 51 is attached to the load wood 3 as shown in FIGS. This is a fastening structure in which a hexagon nut 55 screwed to the screw portion 54 of the shaft portion 53 of the hexagon bolt 51 is fastened to the leg portion 8 of the load while being abutted. 57 is a hexagonal head side washer,
58 is a hexagonal nut side washer, and 59 is a spring washer.

[0004]

However, the fastening structure shown in FIG. 5 has the following problems.

When the hex nut 55 is fastened to the leg portion 8 of the load, if the hex bolt 51 idles (co-rotates), it becomes impossible to fasten the hex nut 52 to the jig 7 such as a wrench.
It was necessary to tighten the hexagon nut 55 with a jig 72 such as an air wrench while stopping it from rotating at 1. It is troublesome for one operator to use the two jigs 71 and 72 at the same time in this manner, and in particular, the jig 71 is applied to the hexagonal head 52 below the load wood 3 or is maintained as it is. It was troublesome to do.

After the tightening, the hexagonal head 52 remains below the lower surface of the load wood 3 (FIG. 5C), so that the fork 10 of the forklift is inserted into the fork insertion space 4 formed below the load wood 3. When inserting
In some cases, the tip of the fork 10 hit the hexagonal head 52 and was difficult to insert. Further, after insertion, the hexagonal head 52 is placed on the fork 10 and makes point contact, so that the hexagonal head 52 tends to slide on the fork 10 when the forklift moves.

After unloading by a forklift, the hex nut 55 is used to remove the leg 8 of the load from the pallet 1.
Even when the screw is loosened and removed from the screw portion 54, the hex nut 55 is difficult to remove if the hex bolt 51 idles. It was necessary to loosen with the jig 72. For this reason, there was the same trouble as the above problem.

Therefore, as shown in FIG. 6, a counterbore recess 6 is formed on the lower surface of the load wood 3, and the hexagon head 52 of the hexagon bolt 51 is inserted into the counterbore recess 6 so as not to protrude downward. Thus, a fastening structure that can solve the above-described problem has been considered.
However, even with this fastening structure, the following problem has occurred in addition to solving the above problem at all.

An operation for forming a counterbore recess 6 on the lower surface of the load wood 3 is required, and the number of steps is increased. Counterbore recess 6
If the hexagonal recess is fitted to the hexagonal head 52, the hexagonal bolt 51 can be prevented from idling, but it is difficult to machine the hexagonal recess. On the other hand, if a circular recess is used, the hexagonal bolt 51 cannot be prevented from idling, so it must be a large circular recess into which a jig such as a wrench can be inserted.

As shown in FIG. 7, the inventor has previously replaced the hexagonal bolt 51 with a dish-shaped head 62 having a conical seating surface 63 and a shaft portion 64 having a screw portion 65. A fastening structure using a countersunk bolt 61 consisting of: As shown in FIGS. 9A and 9B, the wood-side mounting hole 5 and the luggage-side mounting hole 9 are aligned, and the load wood 3 is moved to the wood-side mounting hole 5.
And pass the countersunk bolt 61 through the luggage side mounting hole 9 and (b)
As shown in (c), the dish-shaped head 62 is brought into contact with the load wood 3 and the hex nut 6 screwed into the screw portion 65.
6 is a fastening structure formed by fastening 6 to the leg 8 of the load. 6
8 is a hexagon nut side washer, and 69 is a spring washer.

According to this fastening structure, the entire dish-shaped head 62 does not bite into the load wood 3 and does not protrude downward due to the tightening of the hexagon nut 66 and the pushing action of the conical seat surface 63 (FIG. 1). (C)) The above problem can be solved without forming a counterbore in the load wood 3, and the above problem does not occur. However, the above problem has not been solved at all, and the following problem has occurred.

In order to prevent the countersunk bolt 61 from spinning when the nut is tightened and loosened, a flat or flat screwdriver or other jig 73 is inserted into a flat or flat engagement groove 70 formed in the flat head 62. Must be engaged or maintained as it is, but it is difficult to insert a long jig 73 such as a screwdriver into the fork insertion space 4 which is not so high.

An object of the present invention is to solve all of the above problems, to prevent the bolt from spinning when tightening and loosening the nut without using a jig such as a wrench or a screwdriver, and to prevent the wood from turning. Countersunk bolt with anti-slip mechanism that allows the head of the bolt to bite into the wood so that it does not protrude from the wood without forming a counterbore recess, and a fastening structure and fastening between wood and other materials using the countersunk bolt It is to provide a method.

Japanese Unexamined Patent Publication (Kokai) No. 2-168010 discloses a hexagonal bolt in which protrusions are provided at least at two places on a seating surface of a hexagonal head to prevent co-rotation with a nut. Japanese Unexamined Patent Application Publication No. 7-224829 discloses a hexagonal bolt in which a protrusion is integrally formed at a corner formed by a seating surface of a hexagonal head and a root of a male screw portion to prevent loosening rotation of the bolt. I have.

However, it is considered that these publications only show examples in which the hexagonal head is used so as to contact the metal material. Even if these hexagon bolts are used so that their hexagonal heads are in contact with wood, the hexagonal head has a flat bearing surface, so no matter how much nuts are tightened, the entire hexagonal head will be in contact with wood. It is considered impossible to cut into it.

Accordingly, the inventions of these publications provide, as in the present invention, an anti-spin protruding portion provided on a dish-shaped head having a conical seat surface, and both the entire dish-shaped head and the anti-spin protruding portion are made of wood. It is fundamentally different from the technical idea of trying to dig into it.

[0017]

(1) First, a countersunk bolt with an anti-spin mechanism according to the present invention has a countersunk head with a conical seat, a shaft with a screw, and a conical seat. And an anti-spin protruding portion provided on one or both of the shaft portions.

Here, the shaft portion has a non-threaded portion on the proximal end side and a threaded portion on the distal end side, and the anti-spin projection projects on one or both of the conical seat surface and the non-threaded portion. It is preferable to be provided as follows. It is difficult to provide the anti-spin protruding part so as to cover the thread part with unevenness,
This is because it is easy to provide the non-threaded portion having no unevenness so as to cover it. In addition, it is preferable that the anti-spin protruding portion is provided so as to cover both the conical seat surface and the shaft portion (preferably a non-threaded portion). This is because the strength of the anti-spin protruding portion is increased, and when the anti-spin protruding portion bites into the wood, the anti-spin protruding portion is prevented from falling down.

The anti-slip protruding portion is not particularly limited, but the following (a) and (b) can be exemplified.

(A) Fin-shaped or rib-shaped anti-spin protruding portions The fin-shaped or rib-shaped anti-spin protruding portions are preferably arranged radially. The radially arranged anti-slip protruding part is a virtual line drawn parallel to the shaft from the outer edge of the conical seat surface,
It is preferable that the shape and the size be within a range surrounded by an imaginary line drawn at right angles to the shaft portion from the boundary between the non-threaded portion and the threaded portion. As an example of the shape and dimensions, a substantially triangular plate-like shape having a hypotenuse-shaped ridge extending both from the conical seating surface to the non-threaded portion and extending to both the conical seating surface and the non-threaded portion can be exemplified. It is preferable that the ridge line of the fin-shaped or rib-shaped anti-spin protruding portion (in the case of the substantially triangular plate-shaped anti-spin protruding portion, the oblique ridge line) is formed to be sharp enough to bite into the wood.

(B) Conical or pyramid-shaped anti-spin protruding portion It is preferable that the apex of the conical or pyramid-shaped anti-spin protruding portion is formed to be sharp enough to bite into wood.

The number of the anti-slip protruding portions may be one, but it is preferable that two or more of the anti-slip protruding portions are arranged at intervals. There is no upper limit, but it is up to 20th due to space restrictions. The number of anti-slip projections is preferably 2 to 8, preferably 2 to 8.
To 4 are more preferred.

(2) Next, in the fastening structure for wood and other materials according to the present invention, the wood-side mounting holes formed in the wood and the other material-side mounting holes formed in the other material are aligned with each other. From the other side, the bolt is passed through the wood side mounting hole and the other material side mounting hole, the head of the bolt is brought into contact with the wood, and the nut screwed to the screw part of the bolt shaft is fastened to the other material In the fastening structure of the present invention and the other material, the bolt may be applied to one or both of the conical seat surface and the shaft portion, the shaft portion having the screw portion, and the conical seat surface having the conical seat surface. Using a countersunk bolt with an anti-slip mechanism including an anti-slip projection provided on the lug, the anti-slip projection of the dish-shaped head abutted on the wood is cut into the wood, and the nut is tightened. It is noted that the entire dish-shaped head was cut into the wood by the pushing action of the conical seat. To.

(3) Next, according to the method of fastening wood and other materials according to the present invention, the wood-side mounting holes formed in the wood and the other material-side mounting holes formed in the other material are aligned with each other. The bolt is passed through the mounting hole on the wood side and the mounting hole on the other material from the side, the head of the bolt is brought into contact with the wood, and the nut screwed to the thread of the bolt shaft is tightened to the other material. In the method of fastening between the bolt and the other material, the bolt may be applied to one or both of the conical seat surface, the shaft portion having the screw portion, and the conical seat surface and the shaft portion. Using a countersunk bolt with an anti-slip mechanism including an anti-slip projection provided on the plate, preventing the anti-slip of the countersunk bolt by making the anti-slip projection of the dish-shaped head abutted on the wood bite into the wood. While tightening the nut, tighten the nut and push the conical seating surface. The entire dish-shaped head by a saw action, characterized in that bite into the wood.

In these fastening structures or fastening methods,
The wood is not particularly limited, and may be, for example, a loaded wood of a pallet including a leg material and a fork insertion space below the loaded wood, and other materials are not particularly limited, and may be placed on the loaded wood. Can be exemplified.

The anti-slip protruding portion of the countersunk bolt with the anti-spin mechanism used in the fastening structure or the fastening method may be the same as that exemplified in the above (1).

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a fastening structure and a fastening method between a load wood of a pallet and a load will be described below with reference to FIGS. When carrying a load with a forklift (or other cargo handling equipment such as a hand lift), the load 7 is fastened to the pallet 1 as shown in FIG. The fork 10 is inserted.

The pallet 1 is provided with a plurality of leg lumbers 2 made of, for example, squares of about [height 50 to 150] × [width 30 to 150] arranged at intervals from each other, and is passed over the lumbers 2. For example, [Height 30 to 80] x [Width 30 to 8]
0] load wood 3 (also referred to as a rootstock) made of about square wood.
And a fork insertion space 4 formed below the load lumber 3 and between the leg lumbers 2. The load wood 3 is provided with a wood-side mounting hole 5.

The luggage 7 in the illustrated example is a heavy object such as a distribution transformer, for example, and has a luggage side mounting hole 9 in its leg 8. The pallet 1 may or may not have a side wall (not shown). If the pallet 1 does not have a side wall, a cover (not shown) such as a cardboard box, a wooden box, or a sheet may be provided on the load 7 as necessary. It is covered.

The bolt used in the fastening structure is a countersunk bolt 11 with an anti-spin mechanism, comprising a countersunk head 12 having a conical seating surface 13, a non-threaded portion 15 at the base end side, and a tip end side. A shaft portion 14 having a screw portion 16 on the
And a fin-shaped anti-spin protruding portion 17 provided so as to cover both the non-threaded portion 15.

Three of the fin-shaped anti-spin projections 17 are radially arranged at intervals of 120 degrees. Each anti-slip protruding portion 17 is formed by a virtual line K1 drawn from the outer edge of the conical seat surface 13 in parallel with the shaft portion 14 and a virtual line drawn perpendicular to the shaft portion 14 from the boundary between the non-threaded portion 15 and the screwed portion 16. K2, the projections are provided in a shape and a size that fall within a range surrounded by the projections. Specifically, the entire projection is applied to both the conical seating surface 13 and the non-threaded portion 15 and the non-threaded portion 15 It has a substantially triangular plate shape having a hypotenuse ridgeline 18 extending toward. The ridge line 18 is formed to be sharp enough to bite into the wood.

The fastening structure and the fastening method between the load wood 3 and the load 7 according to the present embodiment are as follows.

As shown in FIGS. 1 (a) and 1 (b), the wood-side mounting hole 5 and the luggage-side mounting hole 9 are aligned. As shown in FIGS. 7B and 7C, the plate-shaped head 12 is brought into contact with the load wood 3 through the bolt 11, and the threaded portion 1 of the shaft portion 14 is inserted.
6, the washer 21 and the spring washer 22 are extrapolated and the hex nut 20 is screwed. Then, the anti-slip protruding portion 17 of the dish-shaped head 12 abutting against the load wood 3 is cut into the load wood 3 (the anti-slip protruding portion 1).
7 compresses and deforms the load wood 3 around the wood-side mounting hole 5. The hexagonal nut 20 is tightened with a jig 72 such as an air wrench while preventing the countersunk bolt 11 from idling, and the hexagonal nut 20 is tightened and the conical seating surface 13 is pushed (load around the wood-side mounting hole 5). The wooden plate 3 is pressed obliquely and deformed by compression.), So that the entire dish-shaped head 12 bites into the loaded wooden plate 3 so as not to protrude below the lower surface of the loaded wooden plate 3.

According to the fastening structure and the fastening method, the following effects can be obtained.

When the hex nut 20 is fastened to the load 7, even if a jig such as a wrench is not used, the idling prevention projection 17 cuts into the load wood 3 and prevents the countersunk bolt 11 from idling. It is sufficient to concentrate on the work of tightening the hexagon nut 20 with the jig 72 such as an air wrench, and this can be easily performed.

After the above tightening, the dish-shaped head 12 does not protrude below the lower surface of the load wood 3 (FIG. 1).
(C)) When inserting the fork 10 of the forklift into the fork insertion space 4, the fork 10 can be easily inserted without the tip of the fork 10 hitting the dish-shaped head 12. After the insertion, the plate-shaped head 12 does not make point contact with the fork 10, so that the pallet 1 does not slide on the fork 10 when the forklift moves.

When the hex nut 20 is loosened and removed from the screw portion 16 in order to remove the load 7 from the pallet 1 after loading by the forklift, the anti-spin protruding portion 17 bites into the load wood 3 to prevent the countersunk bolt 11 from spinning. In order to prevent this, the worker can use the jig 7 such as an air wrench
It is only necessary to concentrate on the loosening work in step 2, and it can be easily performed.

Since the dish-shaped head 12 bites into the load wood 3 by the tightening of the hexagon nut 20 and the pushing action of the conical seating surface 13, the work of forming a counterbore recess on the lower surface of the load wood 3 is unnecessary.

At the time of tightening and loosening the nut, a jig 73 such as a screwdriver is inserted into a minus or plus engagement groove 70 formed in the dish head 62 like the dish bolt 61 in FIG.
Need not be engaged in this example, so there is no difficulty in inserting a long jig such as a screwdriver into the fork insertion space 4 which is not so high. However, assuming a situation where a jig 73 such as a driver is used, as shown by an arrow on the right side of FIG. 3A, a minus or plus engagement groove 19 or a hexagonal recess ( (Not shown) may be formed.

The present invention is not limited to the above-described embodiment, but may be embodied with appropriate modifications without departing from the spirit of the invention, for example, as described below.

(1) The number of the anti-spin protruding portions 17 is appropriately changed, for example, as shown in FIG. 4A, or as shown in FIG.

(2) The anti-spin protruding portion 17 is, for example, shown in FIG.
As shown in (c), a substantially fan-shaped plate is formed on both the conical seating surface 13 and the non-threaded portion 15, or a substantially square plate is formed on both the conical seating surface 13 and the non-threaded portion 15 as shown in (d). As shown in (e), the shape may be changed as appropriate, for example, by forming a substantially semi-disc shape on only the non-threaded portion 15 (or only the conical bearing surface 13).

(3) The anti-spin protruding portion 17 is, for example,
As shown in (f), only the conical seating surface 13 (or the non-threaded portion 1)
5)).

(4) The non-threaded portion is eliminated by using the entire shaft portion 14 as the threaded portion 16, and the conical seating surface 13 and the shaft portion 14 (the threaded portion 1) are removed.
The various anti-slip protruding portions 17 are provided so as to cover either one or both of 6).

(5) The hexagon nut 20 may be another type of nut (square nut or the like).

[0046]

According to the present invention, the countersunk bolt with anti-spin mechanism and the fastening structure and the fastening method for wood and other materials according to the present invention are configured as described above, so that the nut can be tightened without using a jig. In addition, it is possible to prevent the bolt from spinning, and to provide an excellent effect that the head of the bolt can be cut into the wood so as not to protrude from the wood without forming a counterbore in the wood.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a fastening structure and a fastening method of a load wood and a load according to an embodiment of the present invention in order.

FIG. 2 is a cross-sectional view showing the entire fastening structure.

3A and 3B show a countersunk bolt with an anti-spin mechanism used in the fastening structure, wherein FIG. 3A is a side view, FIG. 3B is a plan view, and FIG. 3C is a perspective view.

FIGS. 4A and 4B show various modified examples of the countersunk bolt with the anti-spin mechanism. FIGS. 4A and 4B are plan views, and FIGS. 4C to 4F are side views.

FIG. 5 is a cross-sectional view of a main part showing a fastening structure and a fastening method of a load wood and a load according to a conventional example in order.

FIG. 6 is a cross-sectional view of a main part sequentially showing a fastening structure and a fastening method between a load wood and a load according to another conventional example.

FIG. 7 is a cross-sectional view of a principal part showing a fastening structure and a fastening method of the load wood and the luggage examined in order, in order;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pallet 2 Leg wood 3 Load wood 4 Fork insertion space 5 Wood side mounting hole 7 Luggage 8 Leg part 9 Luggage side mounting hole 10 Fork 11 Countersunk bolt with anti-slip mechanism 12 Plate head 13 Conical seating surface 14 Shaft 15 Non Screw part 16 Screw part 17 Idling prevention protrusion 18 Ridge line 19 Engagement groove 20 Hex nut

Claims (12)

[Claims] 1. A dish-shaped head having a conical seat, a shaft having a thread, and an anti-spin protruding portion provided on one or both of the conical seat and the shaft. Countersunk bolts with anti-slip mechanism including 2. The shaft portion has a non-threaded portion on a proximal end side and a threaded portion on a distal end side, and the anti-spin protruding portion includes
2. The countersunk bolt with an anti-spin mechanism according to claim 1, wherein the countersink is provided so as to cover one or both of the conical seat surface and the non-threaded portion. 3. The flat head bolt with an anti-spin mechanism according to claim 2, wherein the anti-spin protruding portion has a fin shape or a rib shape. 4. The flat head bolt with an anti-spin mechanism according to claim 3, wherein the fin-shaped or rib-shaped anti-spin projections are arranged radially. 5. An imaginary line drawn in parallel with the shaft portion from an outer edge of the conical seat surface, wherein the fin-shaped or rib-shaped anti-spin protruding portion is provided;
5. The flat head bolt with an anti-spin mechanism according to claim 4, wherein the flat head bolt is provided in a shape and a size that fall within a range surrounded by an imaginary line drawn perpendicular to the shaft part from a boundary between the non-thread part and the screw part. 6. The substantially fin-shaped or rib-shaped anti-spin protruding portion has a substantially triangular plate shape having a hypotenuse-shaped ridge extending over both the conical seating surface and the non-threaded portion and extending from the conical seating surface to the non-threaded portion. The countersunk bolt with an anti-spin mechanism according to claim 5 formed. 7. The flat head bolt with an anti-spin mechanism according to claim 3, wherein a ridge line of the fin-shaped or rib-shaped anti-spin prevention projection is formed to be sharp enough to bite into wood. . 8. The flat head bolt with an anti-spin mechanism according to claim 1, wherein the anti-spin protruding portion has a conical shape or a pyramid shape. 9. The flat head bolt with an anti-spin mechanism according to claim 1, wherein two or more of the anti-spin protruding portions are arranged at intervals. 10. A wood-side mounting hole made in wood and another material-side mounting hole made in another material are aligned, and a bolt is passed from the wood to the wood-side mounting hole and the other material-side mounting hole. In the fastening structure between wood and another material, the head of which is brought into contact with the wood and the nut screwed to the screw portion of the shaft of the bolt is tightened to the other material, wherein the bolt has a conical seat surface A countersunk head with an anti-spin mechanism including a countersunk head, a shaft having a threaded portion, and an anti-spin protruding portion provided on one or both of the conical seating surface and the shaft. In addition to using the anti-slip protruding portion of the dish-shaped head in contact with the wood, the anti-spinning projection is cut into the wood, and the entire dish-shaped head is cut into the wood by tightening the nut and pushing the conical seating surface. A fastening structure between wood and other materials. 11. A wood-side mounting hole made in wood and another material-side mounting hole made in another material are aligned, and a bolt is passed from the wood through the wood-side mounting hole and the other material-side mounting hole. A method of fastening wood and another material by abutting the head of the wood to the wood and tightening the nut screwed to the threaded portion of the bolt shaft to the other material, wherein the bolt has a conical seating surface. A countersunk head with an anti-spin mechanism including a countersunk head, a shaft having a threaded portion, and an anti-spin protruding portion provided on one or both of the conical seating surface and the shaft. The nut is tightened while using the anti-slip protruding portion of the dish-shaped head in contact with the wood to prevent the countersunk bolt from spinning by biting into the wood, and tightening the nut and tightening the conical seating surface. Pushes the entire dish-shaped head into the wood Fastening method of wood and other materials, characterized in that. 12. The load wood of a pallet having a leg material and a fork insertion space below the load wood, and the other wood is a load placed on the load wood. A fastening structure between the wood according to claim 10 and another material or a fastening structure between the wood according to claim 11 and another material.