JP2007253300A - Connecting pin, and tool and method of pulling out connecting pin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulling tool capable of pulling out a connecting pin straightly at a later date. <P>SOLUTION: This pulling tool 1 pulls out the connecting pin PN fitted to a structure member after the fact. It is provided with an operation weight 12 movable straightly along a guide rod 11, a securing section 13 fixed to the front end side of the rod 11, and a flange section 21 fixed to the base end side of the rod 11 to receive the move of the operation weight 12. When it is used, the weight 12 is hit against the flange section 21 in a state where the securing section 13 is secured in an auxiliary screw 30 integrated with the pin PN. Thus, the pin PN is pulled out straightly together with the screw 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drawing jig or the like that enables a connecting pin used for joining a structural member such as a wooden building to be pulled out later.

  In a wooden building such as a wooden house, a joint fitting is generally used for joining a beam and a pillar, a pillar and a base, or the like. And when using a joining metal fitting, the connecting pin is used suitably in order to engage a wood with a joining metal fitting reliably.

  This connecting pin is struck tightly inside the structural member, but not only when the connecting location of the connecting pin is wrong, but for example, to extend or demolish a building, you want to unjoin adjacent structural members In some cases, it is necessary to remove the connecting pin from the wood.

  Here, there is no problem when the connecting pin can be knocked out in the direction of entry of the connecting pin, but this is not possible, and there are cases where the connecting pin must be pulled out in the opposite direction. In such a case, a connecting pin pulling jig applying the lever principle is conceivable. However, in this case, there is a problem that the connecting pin cannot be pulled out straight and the wood is also damaged greatly. .

On the other hand, an invention of a connecting pin described in Patent Document 1 has also been proposed. In this invention, a pair of flat surfaces parallel to the head of the connecting pin main body are cut out, and a locking concave groove for a turning operation tool that opens outwardly in the center of the flat top surface of the head is cut out. The connection pin is extracted from the structural member by using a turning operation tool.
Japanese Patent Laid-Open No. 2001-40780

  However, the connecting pin of Patent Document 1 is not easy to manufacture, and it is necessary to screw the connecting pin into wood when in use, which is complicated. In the first place, since a large number of connecting pins are used to complete one building, the cost should be as low as possible, and a simple connection pin mounting operation is strongly desired. Further, there is a demand for a connecting pin that can be pulled out linearly without requiring an electric tool when being pulled out.

  The present invention has been made based on the above requirements, and provides a connecting pin that is inexpensive to manufacture, can be easily used at the time of mounting, and can be easily pulled out linearly after the fact. With the goal. It is another object of the present invention to provide a drawing jig and a drawing method capable of drawing a connecting pin linearly.

  In order to achieve the above object, an invention according to claim 1 is an extraction jig for pulling out a connecting pin attached to a structural member afterwards, and an operation weight that can move linearly along a guide member; A locking portion fixed to one end side of the guide member and lockable to an auxiliary tool integrated with the connecting pin; and fixed to the other end side of the guide member to receive movement of the operation weight. A flange portion, and by striking the operation weight against the flange portion, the auxiliary tool locked to the locking portion is linearly pulled out together with the connecting pin.

  The locking portion has an extending portion extending in a substantially U shape from the proximal end portion toward the distal end, and an accommodation mounting hole into which the guide member is press-fitted is formed in the proximal end portion. preferable. Further, the locking portion has an extending portion extending in a substantially U shape from the base end portion toward the distal end, and the extending portion is provided with a working portion provided at a bottom portion thereof, and from both sides of the working portion. It may be divided into a vertically rising side wall portion, and a substantially U-shaped opening groove may be formed on the distal end side of the locking portion by the side wall portion. Furthermore, a columnar guide member, a substantially cylindrical operation weight loosely fitted to the guide member, a locking portion fixed to the distal end side of the guide member, and a proximal end side of the guide member It is preferable that the flange portion is provided in the holding portion, and the whole is firmly integrated except for the operation weight.

  On the other hand, in the drawing method according to claim 5, the first step of fixing the auxiliary tool to the connecting pin mounted on the structural member, and the locking portion provided on the tip side of the drawing jig are fixed to the connecting pin. A second step of locking the auxiliary tool, and an operation weight movable on the shaft of the pulling jig in a state where the locking part is locked to the auxiliary tool. And a third step of striking on the end side, and the connecting pin mounted on the structural member is pulled out linearly afterwards.

  The invention according to claim 6 is a connecting pin that is used in combination with a joint fitting for joining two adjacent structural members, is formed in a substantially cylindrical shape as a whole, and has a tapered tip. A preliminary hole is formed in the base end of the connection pin PN in advance in the axial direction. When the connection pin is pulled out, an auxiliary tool integrated with the connection pin through the preliminary hole is connected to the connection pin PN. It is designed to be pulled straight along with the pin.

  Here, it is preferable that a part of the connecting pin is provided with a large-diameter part that is larger in the radial direction than the other part. The large-diameter portion is a pressure-deformed raised portion, or the large-diameter portion has a larger diameter on the proximal end side in the axial direction than the distal end side, and there is a mesh-like shape. It is preferable that irregularities are formed.

  According to each of the above-described inventions, it is possible to realize a connecting pin that is inexpensive to manufacture, can be easily used at the time of mounting, and can be easily pulled out linearly after the fact. Further, it is possible to realize a drawing jig and a drawing method that can draw the connecting pin linearly. The present invention is particularly suitable for use with wooden buildings.

  The present invention will be described below based on embodiments. FIG. 1 is a view showing a drawing jig 1 according to the first embodiment, and FIG. 1A is a central sectional view of the drawing jig 1 cut along the line BB in FIG. 1B. 1 (b) is an enlarged front view of the locking portion 13 as viewed in the AA direction of FIG. 1 (a), and FIG. 1 (c) is a partially broken view of the locking portion 13. It is a perspective view.

  As shown in FIG. 1A, the extraction jig 1 is fixed to a columnar guide rod 11, a substantially cylindrical operation weight 12 that is loosely fitted to the guide rod 11, and the distal end side of the guide rod 11. And a holding portion 14 fixed to the proximal end side of the guide rod 11. Each of the members 11 to 14 is made of metal such as steel, and the whole is firmly integrated except for the operation weight 12.

  As the guide rod 11, a steel round rod is typically used, and mounting portions 11b and 11c having slightly small diameters are formed on both ends of the main body portion 11a of the guide rod 11.

  The operation weight 12 is formed in a substantially cylindrical shape as a whole, and is divided into a grip portion 12a at the center in the axial direction and large-diameter flanges 12b at both ends of the grip portion 12a. The operation weight 12 is provided with an insertion hole 15 penetrating the central portion in the radial direction in the axial direction. The inner diameter of the insertion hole 15 is slightly larger than the outer diameter of the guide rod 11. In addition, the grip portion 12a is formed with a concave portion corresponding to a human finger and has a corrugated outer ring portion in the axial direction as a whole.

  As shown in FIGS. 1B and 1C, the locking portion 13 includes a substantially rectangular parallelepiped base end portion 16 and an extending portion 17 extending from the base end portion 16 toward the front end in a substantially U shape. It is divided. The base end portion 16 is formed with a housing mounting hole 16a through which the distal end side mounting portion 11b of the guide rod 11 is press-fitted.

  On the other hand, the extending portion 17 is divided into a working portion 18 provided at the bottom thereof and a side wall portion 19 rising vertically from both sides of the working portion 18, and the side wall portion 19 is used to separate the distal end side of the locking portion 13. Is formed with a substantially U-shaped opening groove.

  The working part 18 provided at the bottom of the extending part 17 is a part for hooking an auxiliary screw 30 (see FIG. 4) for pulling work described later. Therefore, the working part 18 is divided into an introduction part 18a that receives the shaft part 32 of the auxiliary screw 30 and a work main body part 18b that locks the head part 31 of the received auxiliary screw 30 (FIG. 1C). ). As shown in the drawing, the introduction portion 18a extends toward the tip so that the shaft portion 32 of the auxiliary screw 30 can be easily received. Further, the work main body portion 18 b has a slightly larger diameter than the shaft portion 32 of the auxiliary screw 30 and a small-diameter arc shape surely smaller than the head portion 31 of the auxiliary screw 30.

  As the thickness H of the working portion 18 increases, the pulling strength is improved. However, if the thickness is too thick, the workability is inferior, and therefore the workability is inferior. Further, the work main body portion 18b is set to the minimum left-right width W and front-rear width necessary for receiving the head 31 of the auxiliary screw 30 (FIG. 1B).

  In this embodiment, the pair of side wall portions 19, 19 are erected up to the same height as the base end portion 16 on both sides of the working portion 18. Therefore, the working unit 18 maintains a sufficient pulling strength even if the pulling operation described later is repeated.

  As shown in FIG. 1A, the holding portion 14 includes a round bar-like columnar portion 20 and a rectangular plate-like flange portion 21 in which four corners of a substantially square shape are processed. A slightly small-diameter protruding fixing portion 20a is formed on the distal end side of the cylindrical portion 20, and a cylindrical mounting hole 22 having the same diameter as the proximal end mounting portion 11c of the guide rod 11 is formed in the protruding fixing portion 20a. . Here, the outer diameter of the protruding fixing portion 20 a is formed larger than the outer diameter of the main body portion 11 a of the guide rod 11. Further, the depth of the cylindrical mounting hole 22 is formed slightly deeper than the axial length of the proximal end side mounting portion 11 c of the guide rod 11. Therefore, in the state where the proximal end side mounting portion 11c of the guide rod 11 is press-fitted into the cylindrical mounting hole 22, the proximal end surface of the main body portion 11a of the guide rod and the distal end surface of the protruding fixing portion 20a are surely brought into contact with each other. .

  The plate thickness of the flange portion 21 is formed to be approximately the same as the axial length of the protruding fixing portion 20a of the cylindrical portion 20. In addition, a round hole 21 a having an inner diameter that is the same as the outer diameter of the protruding fixing portion 20 a is formed at the center position of the flange portion 21. And the cylindrical part 20 and the flange part 21 are integrated by press-fitting the welding fixing | fixed part 20a of the cylindrical part 20 in the round hole 21a of the flange part 21, and welding.

  The guide rod 11, the operation weight 12, the locking part 13, and the holding part 14 described above are assembled as follows, for example. First, after the front end side attaching portion 11b of the guide rod 11 is press-fitted into the accommodation attaching hole 16a of the engaging portion 13, the guide rod 11 and the engaging portion 13 are integrated by welding. Next, the operation weight 12 is inserted into the guide rod 11, the proximal end side mounting portion 11c of the guide rod 11 is press-fitted into the columnar mounting hole 22 formed in the protruding fixing portion 20a, and then the protruding fixing portion 20a and the guide rod 11 are integrated by welding.

  In the pulling jig 1 assembled as described above, since the operation weight 12 is loosely fitted to the guide rod 11, the operation weight 12 is movable along the axial direction of the guide rod 11. Further, the locking portion 13 and the flange portion 21 fixed to both ends of the guide rod 11 act as a stopper for the operation weight 12 so that the operation weight 12 is not pulled out of the guide rod 11.

  FIGS. 2A and 2B are views showing the connecting pin PN pulled out by the pulling jig 1 of the above embodiment, where FIG. 2A is a front view of the connecting pin PN, FIG. 2B is a plan view, and FIG. Sectional drawing, (d) is BB sectional drawing, (e) is a front view which shows the modification of connecting pin PN.

  The connecting pin PN is formed in a substantially cylindrical shape, and the tip end portion of the connecting pin PN is formed in a truncated cone shape. Further, a preliminary hole HO is characteristically formed at the center in the radial direction at the base end of the connecting pin PN. The preliminary hole HO is a simple round hole in this embodiment, but when the connecting pin PN embedded in the wood is pulled out for some reason, a thread groove is formed afterwards in the round hole. And the auxiliary screw 30 and the connection pin PN are integrated by screwing the auxiliary screw 30 (FIG. 4) into the preliminary hole HO where the thread groove is cut.

  Further, on the outer periphery of the connecting pin PN, raised portions 23 are provided at symmetrical positions on the proximal end side. The raised portion 23 is formed by pressing the connecting pin PN from both sides in the radial direction (the vertical direction in the figure). In addition, although the protruding parts 23 and 23 are parts which prevent rotation of the connecting pin PN embedded in the wood, the base end of the connecting pin PN is used instead of or in addition to the protruding part 23. The side may have a slightly larger diameter and may be knurled to form a fine uneven pattern. FIG. 2E shows a connecting pin PN ′ that has been knurled in place of the raised portion, and is slightly larger than the diameter of the distal end portion from the axial center to the proximal end portion of the connecting pin PN ′. In addition to being formed in a diameter, a mesh-like uneven pattern is formed on the outer periphery thereof.

  FIG. 3 is a perspective view showing a joint structure between the column 2 and the beam 3, and FIG. 4 is a perspective view showing a method of pulling out the connecting pin PN inserted into the beam 3.

  As shown in FIG. 3, a joint fitting 4 is used as a member for joining the column 2 and the beam 3. The joint metal fitting 4 is formed by bending a metal plate into a substantially U shape, the base end part is joined to the column 2 by a bolt / nut, and the tip parts 4a and 4a are joined to the beam 3 and the connecting pin. Joined by PN. Bolt holes (not shown) are formed in the base end portion of the joint fitting 4, cutouts 24 are formed in the upper and lower portions of the distal end portion of the joint fitting 4, and three in the center of both distal end portions. A pin hole 25 is formed.

  The column 2 is formed with two upper and lower cylindrical grooves 26 corresponding to the base end portion of the joint fitting 4. At one end of the beam 3, two cut grooves 27, 27 corresponding to the end portions 4 a, 4 a of the joint fitting 4 are formed from the upper surface to the lower surface. A pin hole 28 corresponding to the notch 24 of the joint fitting 4 and pin through holes 29 and 29 corresponding to the pin hole 25 of the joint fitting 4 are formed across the cut grooves 27 and 27 on the side surface of the beam 3. .

  The column 2 and the beam 3 are joined as follows. By inserting the base end of the joint fitting 4 into the cylindrical groove 26 of the pillar 2, passing a bolt (not shown) through the bolt hole of the joint fitting 4, and tightening a nut (not shown) on the opposite side of the pillar 2, The joining bracket 4 is fixed to the column 2. Next, the connecting pin PN is struck into the pin hole 28 of the beam 3 with a hammer or the like. Then, the beam 3 is dropped from the upper side of the joint fitting 4 and the connecting pin PN inserted into the pin hole 28 is hooked on the upper notch 24 of the joint fitting. Thereafter, the connecting pin PN is inserted into the pin holes 25 and 25 of the joint fitting 4 through the pin through holes 29 and 29 of the beam 3 to fix the joint fitting 4 and the beam 3, so that the beam 3 is attached to the column 2. Join.

  As shown in FIG. 4, in the work completion state, three connection pins PN are inserted into the beam 3, and the base end portion of the connection pin PN appears on the side surface of the beam 3. In such a completed state, there is a case where the column 2 and the beam 3 are desired to be separated from a request for rebuilding or renovation of the building. In such a case, it is sufficient that the connecting pin PN can be knocked out in the direction of the tip, but there are cases where there is no extra space in the direction of the tip of the connecting pin PN due to the structure of the building, and the knocking-out operation may be impossible.

  In such a case, the connecting pin PN is extracted from the beam 3 as follows. First, a screw groove is formed by a thread cutting tool on the inner periphery of the preliminary hole HO of the connecting pin PN. At this time, the raised portions 23 and 23 of the connecting pin PN function as locking pieces, and prevent the connecting pin PN from rotating in the threading operation.

  When the thread groove is formed in this way, the auxiliary screw 30 is then screwed into the preliminary hole HO having the thread groove. This screwing operation is completed before the auxiliary screw 30 is completely screwed. That is, when the screwing operation is completed, the distance from the connecting pin PN to the auxiliary screw head 31 is set to be slightly longer than the plate thickness H of the working portion 18 of the extraction jig 1.

  Next, the introduction portion 18a of the extraction jig 1 is guided to the shaft portion 32 of the auxiliary screw 30, and finally the head portion 31 of the auxiliary screw is held by the work main body portion 18b. In this state, the operator grasps the operation weight 12 and the holding part 14 and strikes the operation weight 12 against the flange part 21 many times. Then, a force acts in a direction in which the operation weight 12 is struck, that is, a direction away from the beam 3, and the connecting pin PN is pulled out linearly together with the auxiliary screw 30 without being rotated.

  Although the present invention has been described based on the above embodiment, the present invention is not limited to the above-described embodiment unless the gist thereof is changed. For example, in the embodiment, in the preliminary hole HO of the connection pin PN, a screw groove is formed by threading when the connection pin PN is pulled out. However, the connection pin PN in which the screw groove is formed in advance in the preliminary hole HO is used. May be. In this case, the threading operation is omitted, the auxiliary screw 30 is screwed into the preliminary hole HO of the connection pin PN, and the connection pin PN is extracted by the extraction jig 1.

  Further, the extraction jig 1 may be the extraction jig 1 of the second embodiment shown in FIG. FIG. 5 is a view showing the extraction jig 1 according to the second embodiment, and FIG. 5A is a central sectional view of the extraction jig 1 cut along the line BB in FIG. 1B. 5B is an enlarged front view of the locking portion 13 viewed in the AA direction of FIG. 1A, and FIG. 5C is a perspective view of the locking portion 13. FIG.

  The gripping portion 12a of the operation weight 12 of the extraction jig 1 shown in FIG. 5 has a cylindrical shape without a recess corresponding to a human finger. By forming the grip portion 12a in this way, the operation weight 12 can be easily manufactured. Further, it is effective when the operation weight 12 is once gripped, the operation weight 12 is thrown toward the flange portion 21, and the connecting pin PN is pulled out together with the auxiliary screw 30.

  The locking portion 13 of the extraction jig 1 is divided into a substantially rectangular parallelepiped base end portion 16 and an extending portion 17 extending from the base end portion 16 toward the front end. In the base end portion 16, an accommodation mounting hole 16a into which the distal end side mounting portion 11b of the guide rod 11 is press-fitted is formed so as to penetrate therethrough as in the extraction jig 1 of the first embodiment. The base end side of the extending portion 17 is formed in a substantially arc shape, and a substantially U-shaped opening groove is formed on the distal end side. Further, the wall thickness H of the extended portion 17 is formed to be thinner than the thickness of the base end portion 16. The extending portion 17 locks the introduction portion 18a that receives the shaft portion 32 of the auxiliary screw 30 and the head portion 31 of the received auxiliary screw 30 as a portion to which the auxiliary screw 30 (see FIG. 4) for drawing work is hooked. Are divided into work main body portions 18b (FIGS. 5B and 5C). As shown in the drawing, the introduction portion 18a extends toward the tip so that the shaft portion 32 of the auxiliary screw 30 can be easily received. Further, the work main body portion 18 b has a slightly larger diameter than the shaft portion 32 of the auxiliary screw 30 and a small-diameter arc shape surely smaller than the head portion 31 of the auxiliary screw 30.

  Since the locking portion 13 of the drawing jig 1 of the second embodiment is formed as described above, it is not necessary to provide the side wall portion 19 as in the first embodiment, and the locking portion 13 can be more easily attached. Can be manufactured.

It is drawing which shows the extraction jig | tool which concerns on embodiment of this invention. It is drawing which shows the connection pin PN. It is drawing which shows the junction structure of a column and a beam. It is drawing which shows the extraction method of connecting pin PN. It is drawing which shows the modification of a drawing jig | tool.

Explanation of symbols

1 Extraction jig 11 Guide member (guide rod)
12 Operation weight 13 Locking part 21 Flange part 30 Auxiliary tool (auxiliary screw)
PN connecting pin

Claims (8)

A drawing jig for pulling out the connecting pin mounted on the structural member afterwards,
An operation weight that is linearly movable along the guide member;
A locking portion fixed to one end of the guide member and lockable to an auxiliary tool integrated with the connecting pin;
A flange portion fixed to the other end of the guide member and receiving the movement of the operation weight;
A drawing jig characterized in that the auxiliary tool locked to the locking portion is pulled out linearly together with the connecting pin by hitting the operation weight against the flange portion. The locking portion has an extending portion extending in a substantially U shape from the base end portion toward the tip end, and an accommodation mounting hole into which the guide member is press-fitted is formed in the base end portion. Item 2. The extraction jig according to Item 1. A columnar guide member, a substantially cylindrical operation weight loosely fitted to the guide member, a locking portion fixed to the distal end side of the guide member, and a holding fixed to the proximal end side of the guide member The extraction jig according to claim 1, wherein the flange portion is provided in the holding portion, and the whole is firmly integrated except for the operation weight. A first step of fixing the auxiliary tool to the connecting pin mounted on the structural member;
A second step of locking the locking portion provided on the distal end side of the pulling jig to the auxiliary tool fixed to the connecting pin;
A third step of striking an operation weight movable on the axis of the pulling jig against the base end side of the pulling jig in a state where the locking part is locked to the auxiliary tool,
A method for pulling out a connecting pin, wherein the connecting pin attached to the structural member is pulled out linearly afterwards. A connecting pin that is used in combination with a joint fitting for joining two adjacent structural members, is formed in a substantially cylindrical shape as a whole, and has a tapered tip.
A preliminary hole is formed in advance in the axial direction at the base end of the connecting pin PN,
A connecting pin configured such that, when the connecting pin is pulled out, an auxiliary tool integrated with the connecting pin through the preliminary hole is pulled out linearly together with the connecting pin. The connecting pin according to claim 5, wherein a part of the connecting pin is provided with a large-diameter portion that is larger in the radial direction than the other part. The connecting pin according to claim 6, wherein the large-diameter portion is a raised portion that is pressure-deformed. 8. The connecting pin according to claim 6, wherein the large-diameter portion has a larger diameter at the proximal end side in the axial direction than the distal end side, and has a mesh-like unevenness formed thereon.

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