JP2023090226A - Drift pin and method for reusing lumber using drift pin - Google Patents

Abstract

To easily improve economic efficiency by facilitating reuse of building members such as lumber.SOLUTION: In a state where a part of a connection fitting 3 for connecting a first member and a second member is inserted into a slit 4 of a predetermined depth formed in an end surface part of one member, a drift pin can be driven into a pin insertion hole 5 formed in a side surface of the one member and a part of the connection fitting 3 in the slit 4 to connect the one member and the connection fitting 3, where a locking recess part for a pin extraction fitting is provided at a driving base end part opposite to a driving tip end part.SELECTED DRAWING: Figure 1

Description

In the present invention, a part of a connecting fitting that connects a first member and a second member is inserted into a slit of a predetermined depth formed in an end surface of one of the members. The present invention relates to a drift pin that can be driven into a pin insertion hole formed in a side surface and a part of the connecting fitting in the slit to connect the one member and the connecting fitting, and a wood recycling method using the drift pin.

Conventionally, for example, in wooden construction, drift pins are used at joints between columns and beams and joints between beams. One member and the connecting fitting are connected by driving the portion into the pin insertion hole with a hammer or the like (see, for example, Patent Document 1).

JP 2017-119962

Especially when the above-mentioned conventional first member and second member are made of wood, in order to relocate the building to another place after assembling the building, or to divert it to a building for a purpose different from the original building. However, it has not been considered to re-use building materials such as timbers once dismantled and reconstructed.
Therefore, no special improvements have been made to the drift pin.
However, when a building is used for a short period of time and the same building is relocated to another location or converted to another building, the dismantling of the old building may damage the joints between the members. In many cases, it was difficult and uneconomical to reuse the materials.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, to facilitate the reuse of building members such as lumber, and to improve the economic efficiency by relocating or diverting them to buildings for other purposes.

A first characteristic configuration of the drift pin of the present invention is that a part of the connecting fitting that connects the first member and the second member is inserted into a slit of a predetermined depth formed in the end surface of one of the members. A drift pin that can be driven into a pin insertion hole formed in a side surface of the one member and a part of the connecting fitting in the slit to connect the one member and the connecting fitting, At the driving base end on the opposite side of the driving tip, there is a recess for locking the pin extraction fitting.

According to the first characteristic configuration of the present invention, the driving base end portion of the drift pin on the side opposite to the driving tip portion is provided with a locking recess for the pin extraction metal fitting, so that the drift pin can be driven into one member. The drift pin can be easily pulled out by engaging and connecting the metal fitting for pulling out the pin and the recessed part for locking, so that it is possible to dismantle the drift pin without breaking the connecting part of one member as much as possible. Made it easier to reuse building components.

A second characteristic configuration of the present invention is that the locking recess is formed with a female screw portion that can be screwed with a male screw portion formed at the tip portion of the pin extraction fitting, and the drive base end portion (1) is provided with an enlarged diameter hole portion having a diameter larger than the diameter of the trough portion of the female screw portion, at the outer end portion of the female screw portion relative to the entrance thereof.

According to the second characteristic configuration of the present invention, the drive base end of the drift pin is generally driven into the pin insertion hole formed in one member with a hammer or the like. In this case, since the enlarged diameter hole provided at the outer end of the female threaded portion is larger than the diameter of the trough portion of the female threaded portion, even if the impact of hammering is large, the driving base may be damaged. Even if the end part is plastically deformed, the deformation of the female screw part can be prevented, therefore, the pullout operation of the drift pin can be favorably performed without impeding the threaded connection with the metal fitting for pulling out the pin when the building is dismantled. .

A third characteristic configuration of the present invention is that the main body portion between the driving tip portion and the driving base end portion has an uneven surface portion formed on a part of the outer peripheral surface thereof in the longitudinal direction.

According to the third characteristic configuration of the present invention, in addition to being able to achieve the above-described effects of the first characteristic configuration of the present invention, the uneven surface portion formed on a part of the outer peripheral surface of the main body portion As a result, the coefficient of friction with the one member increases, and the state of connection between the one member and the connecting fitting can be maintained in a more stable state.

According to a fourth characteristic configuration of the present invention, the driving proximal end portion is provided with a collar portion having a larger diameter than the outer diameter of the main body portion.

According to the fourth characteristic configuration of the present invention, when the drift pin is driven into a pin insertion hole that is drilled in one member, for example, in a vertical direction or an oblique direction, the one member is particularly made of wood. In such a case, there is a risk that the friction holding force with the pin insertion hole will be loosened due to external forces such as long-term dryness and vibration applied to the building, and in that case, the collar portion will be pulled out of the pin insertion hole. can be prevented, and the long-term structural stability of the building can be easily guaranteed.

In a fifth characteristic configuration of the present invention, the drift pin is composed of at least two kinds of plural drift pins, and the uneven surface portion of the second drift pin is higher than the uneven surface portion of the first drift pin among the plural drift pins. The uneven surface portion is formed at a position close to the driving tip.

According to the fifth characteristic configuration of the present invention, the uneven surface portion of the second drift pin is more likely than the uneven surface portion of the first drift pin among the plurality of drift pins. By forming the position of ( ) at a position close to the driving tip, for example, the first drift pin and the second drift pin can be selectively used depending on the difference in the material of the one member. Further, when one of the members is reused several times, the diameter of the concave-convex surface portion formed near the driving tip portion is expanded by using the second drift pin after extracting the first drift pin. It is possible to maintain the retention force of the drift pin in the reuse of the member by press-fitting it into an unused pin insertion hole.

A sixth characteristic configuration of the present invention is that the drift pin is composed of a plurality of drift pins of at least two types, and the rugged surface portion of the first drift pin of the plurality of drift pins is closer to the axis of the second drift pin than the uneven surface portion of the first drift pin. The forming area of the uneven surface portion in the center direction is enlarged.

According to the sixth characteristic configuration of the present invention, for example, the first drift pin and the second drift pin can be selectively used depending on the difference in the material of the one member.
That is, if one member is made of a hard material, the use of the first drift pin facilitates hammering into the pin insertion hole, and if the material is soft, the second drift pin is used. By using it, the frictional resistance increases, making it easier to prevent the drift pin from slipping out after driving.
Further, when one of the members is reused several times, the retention force of the drift pins can be maintained during the reuse of the member by sequentially replacing the first and second drift pins.

A seventh characteristic configuration of the present invention is that the drift pin is composed of at least two types of drift pins, and the uneven surface portion of the second drift pin is more likely than the uneven surface portion of the first drift pin among the plurality of drift pins. The degree of projection of the projections on the uneven surface is increased.

According to the seventh characteristic configuration of the present invention, for example, the first drift pin and the second drift pin can be selectively used depending on the difference in the material of the one member.
That is, if one member is made of a hard material, the use of the first drift pin facilitates hammering into the pin insertion hole, and if the material is soft, the second drift pin is used. By using, the degree of protrusion of the protrusion is increased (that is, the maximum outer diameter of the protrusion is greater at the second drift pin than at the first drift pin), thereby increasing the frictional resistance, It becomes easy to prevent the drift pin from slipping out after driving.
Further, when one of the members is reused several times, the retention force of the drift pins can be maintained during the reuse of the member by sequentially replacing the first and second drift pins.

An eighth characteristic configuration of the present invention is a lumber recycling method using a drift pin, wherein the one member is a lumber, and the first drift pin is driven into the pin insertion hole to and the connecting fitting are connected to each other, the distal end portion of the pin drawing fitting and the locking recess are locked and connected to pull out the first drift pin from the one member, The first member and the second member are placed in a dismantled state in which they are separated, and then connected again in a slit of a predetermined depth formed in the end face portion of the one member used in the first connected state. After inserting a part of the metal fitting, the second drift pin is driven into a pin insertion hole formed in a side surface of the one member and a part of the connecting metal fitting in the slit to connect the one member and the said one member. A second connection state is established in which the metal fittings are connected.

According to the eighth characteristic configuration of the present invention, the pin extraction fitting can easily extract the drift pin from one member while preventing the structural connection portion of the building from being destroyed. Each member can be easily reused to be in the second connected state, and economic efficiency can be improved.
When the lumber used in the first connected state is reused and the drift pin is driven into the second connected state, the inner surface of the pin insertion hole after the disassembled state is driven into the first connected state. Even if the drift pin is slightly roughened by the uneven surface portion of the drift pin due to the withdrawal operation of the drift pin, a strong engagement force between the uneven surface portion of the drift pin and the pin insertion hole in the second connected state is ensured, and the first member is restored. A stable connection state with the second member can be ensured.
That is, even if the first drift pin is used in the first connected state, and the pin insertion hole of one member is expanded by driving the first drift pin in the second connected state after separation and dismantling. By using the second drift pin, a high frictional engagement force is ensured between the second drift pin and the pin insertion hole, so that one member can be easily reused.
Therefore, it is possible to improve the economic efficiency by reusing the building members.

In a ninth characteristic configuration of the present invention, the drift pin is driven through different openings of the pin insertion hole in the first connected state and the second connected state.

According to the ninth characteristic configuration of the present invention, in the pin insertion hole, when the first connection state is established, the drift pin driving portion behind the opening of the pin insertion hole is expanded in diameter by the drift pin, or the inner surface of the drift pin is expanded. is deformed and the drift pin is driven in again, the friction holding force of the pin insertion hole with respect to the drift pin may be lower than that in the first connection state. When the drift pin is driven from the different opening of the pin insertion hole in the second connected state and the second connection state, the passing positions of the uneven surface portions do not overlap, and it is similar to driving the drift pin into the new pin insertion hole portion. A high frictional holding force of the pin insertion hole with respect to the drift pin can be ensured.
For this reason, when reusing a building member, for example, when the pin insertion hole is a through hole, driving the drift pin from the opening on one side and driving the drift pin from the opening on the other side are performed as follows: If the construction members are used twice in the first connection state and the second connection state, respectively, the building members can be reused at least four times in total.

A tenth characteristic configuration of the present invention is that the pin insertion hole is a through hole whose orientation has a vertical component, and the driving base end portion of the drift pin has a diameter larger than the outer diameter of the main body portion. A flange is provided, and the drift pin is driven in such that the flange is located on the higher side of the two openings of the pin insertion hole.

According to the tenth characteristic configuration of the present invention, by driving the drift pin so as to position the flange on the higher side of the two openings of the pin insertion hole, vibrations or the like are applied to the building. Even if it does, it is possible to prevent the drift pin from dropping downward in the pin insertion hole.
Therefore, the connection structure by the drift pin can be stably maintained.

FIG. 3 is an overall perspective view of the disassembled state before the drift pin is assembled; It is a perspective view of the state of use where the drift pin was assembled. (a) is a partial vertical cross-sectional front view of a drift pin, and (b) is a partial vertical cross-sectional front view of a driving base end portion (AA portion in (a)) of the drift pin. In front views of the drift pins, (a) is the drift pin in the first connected state, (b) is the drift pin in the second connected state, (c) is the drift pin in the first connected state of another embodiment, (d) shows the drift pin in the second connected state of another embodiment. It is an operation diagram showing the procedure for using the pin extraction hardware to extract the drift pin, (a) is the state before connection to the drift pin, (b) is the state connected to the drift pin, and (c) is the pin extraction. (d) shows the state in which the weight member of the metal fitting is being slid and pulled out, and the drift pin is pulled out. (a) is a plan view showing a pin connection state of a comparative example, and (b) is a longitudinal sectional front view taken along line BB of (a). (a) is a partial longitudinal front view of the drift pin of another embodiment, and (b) is a partial longitudinal front view of the drive base end (CC portion in (a)) of the drift pin of another embodiment. It is a diagram. (a) is a plan view using a drift pin of another embodiment, and (b) is a vertical sectional front view along DD of (a).

An embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, in a wooden building, for example, when connecting a beam 2 made of wood to a pillar 1 made of wood, it is a part of a connecting fitting 3 made of sheet metal attached to the pillar 1. A pair of left and right side plates 3A protrude from the base end portion 3B of the connecting fitting 3 and are inserted into a pair of slits 4 of a predetermined depth formed in the end face portion of the beam 2. Drift pins 6 are driven into pin insertion holes 5 respectively formed in the pair of side plates 3A of the connecting fitting 3 in the slit 4 to enable the beam 2 and the connecting fitting 3 to be connected.

The connecting fitting 3 is connected to the column 1 by forming a bolt insertion hole 7 in each of the base end portion 3B of the coupling fitting 3 and the column 1, and inserting a bolt through the bolt insertion hole 7 via a washer (not shown). 9, the base end portion 3B of the connecting fitting 3 is fixed to the column 1. As shown in FIG.
A base end portion 3B of the connecting fitting 3 is accommodated in a first counterbore portion 10 formed in the column 1 and having a larger diameter than the bolt insertion hole 7. On the opposite side, the column 1 is also formed with a second counterbore 11 for internally fitting the bolt head 9A or the nut 12 therein.
In addition, pin grooves 13 are formed in the pair of left and right side plates 3A of the connecting fitting 3 to lock the drift pin 6 and temporarily fix the beam 2 to the column 1. By locking the drift pin 6 in the pin groove 13 while driving the pin 6, when the beam 2 is temporarily fixed to the column 1 and the drift pin 6 is driven into another pin insertion hole 5, A beam 2 is fixed to a pillar 1 .

[First embodiment]
As shown in FIGS. 3(a) and 3(b), the drift pin 6 is formed of a metal bar having a rounded tip, and the driving proximal end opposite to the driving tip 14 is formed. The portion 15 is provided with a locking recess 17 for a pin extraction fitting 16 .
That is, the driving tip portion 14 is formed to have a smaller diameter toward the tip side, and the driving proximal end portion 15 for giving a direct impact by the hammer on the side opposite to the driving tip portion 14 is formed with the driving tip portion 14 as described above. It is formed to have a diameter equal to or larger than that of the body portion 25 between the driving base end portion 15 .

Then, as shown in FIGS. 1, 2, 3(a) and (b), in order to reuse the lumber, the drive base end portion 15 of the drift pin 6 on the side opposite to the drive end portion 14 is A locking recess 17 is provided for a pin drawing metal fitting 16, and the drift pin 6 is driven into the pin insertion hole 5 to move the beam 2, which is one of the members, and the connecting metal fitting 3 from the first connected state to the connecting metal fitting 3. The tip of the extraction fitting 16 and the locking recess 17 are engaged and connected to pull out the drift pin 6 from the beam 2 (FIGS. 5(a) to 5(d)), thereby separating the column 1 and the beam 2. In the dismantled state, after that, after inserting a part of the connecting fitting 3 into the slit 4 of a predetermined depth formed in the end face portion of the beam 2 used in the first connected state, the side surface of the beam 2 and the slit A drift pin 6 is driven into a pin insertion hole 5 formed in a part of the connecting metal fitting 3 in 4 to bring the beam 2 and the connecting metal fitting 3 into a second connected state.

As shown in FIGS. 3(a) and 3(b), the locking recess 17 is provided with a female threaded portion 18, and a female screw is provided at the outer end portion closer to the entrance of the recess than the female threaded portion 18. An expanded hole portion 19 having a larger diameter than the root portion of the portion 18 is provided. is plastically deformed, deformation of the female threaded portion 18 can be prevented. The pull-out operation of the drift pin 6 can be performed satisfactorily without impeding the threaded connection work with the female screw portion 18 provided in the .
As shown in FIG. 5, the metal fitting 16 for extracting the pin has a rod-like main body 22 having a male threaded portion 20 at its tip and a slidable weight member 21 provided on the main body 22 . It is slid between a pair of stopper portions 23 provided at two locations, one end on the base end side and the other end before the male screw portion 20, to the stopper portion on the side opposite to the male screw portion 20. It is composed of a so-called slide hammer that can apply a pull-out force to the male screw portion 20 by applying an impact force.

Further, as shown in FIGS. 3A and 3B, a chamfered portion is provided on the outer peripheral edge portion of the driving base end portion 15 of the drift pin 6 so that the main body portion 25 is deformed plastically even by the driving impact of the hammer. It is possible to prevent the outer diameter from becoming larger than that.

On the outer peripheral surface of the drift pin 6, in order to increase the connection force with the pin insertion hole in the wood, a part of the outer peripheral surface in the longitudinal direction is formed with an uneven surface portion 26, for example, by knurling (Fig. 4(a), (c)).
After the drift pins 6 driven in the first connected state are pulled out to be in the dismantled state, the drift pins 6 are driven in again to make the second connected state, so that the building materials are reused in the second connected state. The drift pin 6 has a knurled portion different from that used in the first connected state (FIGS. 4(b) and 4(d)).
That is, among the drift pins 6, the unevenness of the second drift pin 6B used in the second connected state is higher than the position of the uneven surface portion 26 of the first drift pin 6A used in the first connected state (FIG. 4A). The position of the surface portion 26 is provided at a position close to the driving tip portion 14 (FIG. 4(b)).
Therefore, the position of the uneven surface portion 26 of the second drift pin 6B used in the second connected state is closer to the driving tip portion 14 than the position of the uneven surface portion 26 of the first drift pin 6A used in the first connected state. By providing, after pulling out the first drift pin 6A used in the first connected state, unlike the rough surface portion of the inner surface of the pin insertion hole 5 formed by the uneven surface portion 26 of the first drift pin 6A, The concave-convex surface portion 26 of the second drift pin 6B forming the second connection state is driven into the pin insertion hole portion that is not damaged by the concave-convex surface portion 26, so that the connection state when the building member is reused can be made stronger. .

[Another embodiment]
Other embodiments will be described below.
In addition, in other embodiments below, the same reference numerals are given to the same members as in the above embodiment.
<1> The object to be connected may be the drift pin 6 used for the connection structure of materials other than wood.
<2> The locking recess 17 is provided with a female threaded portion 18 for connection with the pin extraction metal fitting 16. There may be other constructions and simple constructions of the locking mechanism.
<3> The degree of projection of the convex portion of the uneven surface portion 26 of the second drift pin 6B may be made larger than that of the uneven surface portion 26 of the first drift pin 6A of the plurality of drift pins 6 .
<4> As shown in FIGS. 4(c) and 4(d), the uneven surface portion 26 has a length provided in the first drift pin 6A to be driven in the first connected state (FIG. 4(c)). The length of the second drift pin 6B to be driven in the connected state (FIG. 4(d)) may be made longer.
<5> The uneven surface portion 26 may have a spiral groove shape, a large number of wart-like projections, a plurality of ring grooves, or a ring-shaped convex portion other than knurling.
<6> With the connecting fitting 3 attached to the column 1, the side plate 3A of the connecting fitting 3 is inserted into the slit 4 formed in the end face of the beam 2, and the column 1 and the beam 2 are connected by the drift pin 6. Although the structure for connecting is described as an example, an example in which the drift pin 6 is used in a structure for connecting beams 2 having different extending directions may be used.

[Second embodiment]
As shown in FIGS. 6A and 6B, when the drift pin 6 is used in a connecting structure or the like between the beams 2 that support the floor surface, the drift pin 6 may move vertically or vertically. In this case, with a normal rod-shaped drift pin 6, if the pin insertion hole 5 is a vertical through hole, external factors such as vibration acting on the building , can escape downwards. On the other hand, as shown in FIGS. 7A, 7B, 8A, and 8B, a flange having a larger diameter than the outer diameter of the body portion 25 is provided at the driving base end portion 15 of the drift pin 6 . A drift pin 6 provided with a portion 27 is used, and the drift pin 6 is driven so that the collar portion 27 is positioned on the higher side of both openings of the pin insertion hole 5.例文帳に追加

7(a) and 7(b), the engagement recess 17 of the drift pin 6 is provided with a female threaded portion 18, and the female threaded portion 18 is located closer to the entrance of the recess than the female threaded portion 18, as shown in FIGS. An enlarged diameter hole 19 larger than the diameter of the trough of the female screw 18 is provided at the outer end of the drift pin 6, and when the drift pin 6 is driven into the pin insertion hole 5 of the wood with a hammer, for example, by hammering Even if the impact is large and the driving base end portion 15 is plastically deformed, the deformation of the female screw portion 18 can be prevented. The pull-out operation of the drift pin 6 can be favorably performed without impeding the threaded connection work between the male threaded portion 20 formed at the distal end portion and the female threaded portion 18 provided at the driving base end portion 15 of the drift pin 6.例文帳に追加.

[Another way to use the drift pin]
A drift pin 6 is driven through different openings of the pin insertion hole 5 in the first connected state and the second connected state.
That is, when the pin insertion hole 5 is in the first connected state, the drift pin driving portion behind the opening of the pin insertion hole is expanded in diameter by the drift pin 6 or the inner surface thereof is deformed, so that the drift pin is driven again. , when the drift pin 6 is driven, the friction holding force of the pin insertion hole 5 with respect to the drift pin 6 may be lower than that in the first connection state. If the drift pin 6 is driven into a different opening of the pin insertion hole 5 in , the same thing as driving the drift pin 6 into a new pin insertion hole can be performed, and the friction holding force of the pin insertion hole 5 with respect to the drift pin 6 is high can be secured.
Therefore, in reusing the building member, for example, when the pin insertion hole 5 is a through hole, the drift pin 6 is driven through the opening on one side and the drift pin 6 is driven through the opening on the other side. are used twice in the first connected state and the second connected state respectively, the building members can be reused at least four times in total.

As described above, reference numerals are used for convenience of comparison with the drawings, but such entries do not limit the present invention to the configurations shown in the accompanying drawings. Moreover, it is a matter of course that the present invention can be embodied in various modes without departing from the gist of the present invention.

3 Connection fitting 4 Slit 5 Pin insertion hole 6 Drift pin 6A First drift pin 6B Second drift pin 14 Drive tip part 15 Drive base end part 16 Pin extraction metal fitting 17 Lock recess 25 Body part 26 Uneven surface part 27 Flange part

Claims (10)

A part of the connecting fitting that connects the first member and the second member is inserted into a slit of a predetermined depth formed in the end surface of the one member, and the side surface of the one member and the slit forming a pin insertion hole formed in a part of the connecting metal fitting inside so that the one member and the connecting metal fitting can be connected by driving the pin into the pin insertion hole, and forming a driving tip part so that the diameter becomes smaller toward the tip side,
A driving proximal end portion for direct impact by a hammer on the side opposite to the driving distal end portion is formed to have a diameter equal to or larger than that of a body portion between the driving distal end portion and the driving proximal end portion. a drift pin with
A drift pin provided with a recess for engagement with a metal fitting for pulling out the pin at the driving base end. A female threaded portion that can be screwed with a male threaded portion formed at the tip of the pin extraction fitting is formed in the locking recess,
2. The drift pin according to claim 1, wherein the driving proximal end has an enlarged diameter hole portion larger than the diameter of the trough portion of the female thread portion at the outer end portion of the inlet of the female thread portion. 3. The drift pin according to claim 1 or 2, wherein the main body portion has an uneven surface portion provided with a large number of projections projecting in a diameter-expanding direction on a portion of the outer peripheral surface in the longitudinal direction. 4. The drift pin according to any one of claims 1 to 3, wherein the driving base end portion is provided with a collar portion having a larger diameter than the outer diameter of the main body portion. The drift pin according to claim 3 or 4 consists of a plurality of drift pins of at least two types,
A drift pin in which the uneven surface portion of a second drift pin of the plurality of drift pins is formed closer to the driving tip than the uneven surface portion of the first drift pin. The drift pin according to claim 3 consists of a plurality of drift pins of at least two types,
A drift pin in which the forming area of the uneven surface portion in the axial direction of the second drift pin is larger than the uneven surface portion of the first drift pin among the plurality of drift pins. The drift pin according to claim 3 consists of a plurality of drift pins of at least two types,
A drift pin in which the degree of protrusion of the convex portion of the uneven surface portion of the second drift pin is made larger than that of the uneven surface portion of the first drift pin among the plurality of drift pins. 8. The method of reusing wood using drift pins according to any one of claims 5 to 7, wherein the one member is wood, and the first drift pin is driven into the pin insertion hole and the From the first connected state in which one member and the connecting fitting are connected, the tip portion of the pin drawing fitting and the locking recess are locked and connected to remove the first drift pin from the one member. pulling out to dismantle the first member and the second member to separate them;
After that, after inserting a part of the connecting fitting again into the slit of a predetermined depth formed in the end face portion of the one member used in the first connected state, the side surface of the one member and the A piece of wood using a drift pin, wherein the second drift pin is driven into a pin insertion hole formed in a part of the connecting fitting in the slit to establish a second connection state in which the one member and the connecting fitting are connected. How to reuse. 9. The method of recycling lumber using drift pins according to claim 8, wherein the drift pins are driven through different openings of the pin insertion holes in the first connected state and the second connected state. The pin insertion hole is a through hole whose orientation has a vertical component, and a collar portion having a larger diameter than the outer diameter of the body portion is provided at the driving base end portion of the drift pin, and the pin insertion hole is a through hole having a vertical component. 5. The method of recycling lumber using a drift pin according to claim 4, wherein said drift pin is driven so as to locate said flange on the higher side of both openings of said hole.

Images