JP5385065B2 - Drift pin - Google Patents

Description

  The present invention relates to a drift pin used for fastening woods constituting a skeleton of a wooden building.

  Wooden buildings assemble a skeleton by fastening timbers such as pillars and beams, but in order to secure the strength of the skeleton, it is necessary to firmly tie up adjacent timbers. Techniques such as processing have been introduced for a long time. In recent years, instead of joints, connecting hardware and metal shafts are also used. There are various shapes and usages of connecting hardware, but the one that is widely used is the “U” shape, which consists of a front plate in the center and a horizontal plate that protrudes perpendicularly from both sides. is there. When two pieces of wood are fastened in a T shape using this connecting hardware, the front plate is brought into contact with the side of one piece of wood and fixed with bolts or nails, etc., and the horizontal plate is attached to the end of the other piece of wood. Insert the drift pin into the slit machined in the hole and penetrate the horizontal plate and the other wood.

  A metal shaft, which is widely used along with the connecting hardware, is inserted so as to penetrate the boundary between two pieces of wood to be fastened. And if a drift pin is driven so that it may penetrate a shaft from the side of wood, both wood will be firmly fastened via a drift pin and a shaft. Thus, when using a connecting hardware or a shaft, a drift pin is indispensable. A drift pin is a simple shape in which a circular cross-section metal bar is cut to a predetermined length and the outer edges of both ends are scraped off. There are cases where hundreds are used.

  Regarding the drift pin, the following patent documents related to the present invention are disclosed. In this technique, a pin mounting forgetting prevention member is driven in advance into an end portion of a pin hole for driving a drift pin, and this pin mounting forgetting prevention member includes a shuttle portion inserted into the pin hole, And a base portion located outside the pin hole. Then, after inserting the pin attachment forgetting prevention member into the end portion of the pin hole, when the drift pin is driven into the pin hole, the shuttle portion and the base portion are separated and fall from the pin hole. Accordingly, if the pin attachment forgetting prevention member remains on the surface of the wood, the drift pin is not driven into the pin hole, and the place where the driving is forgotten can be easily identified.

JP 2009-156024 A

  When wood is fastened using drift pins as described above, it is necessary to correctly drive the number of drift pins determined by design in order to secure the strength of the building. In addition, even if the number of driving is insufficient, there is a possibility that it can endure a static load, but if a dynamic load is applied due to an earthquake or the like, the fastening portion may be destroyed and the whole may collapse. Therefore, it is necessary to check whether or not the drift pin is driven correctly during construction, but it may be difficult to check the fastening portion at a high place from the floor surface. This is because most drift pins are driven in the horizontal direction, and the drift pins are embedded in the wood so that they do not hinder the subsequent process. This is because the end face is difficult to see.

  Therefore, in order to accurately confirm whether or not the drift pin has been driven, it is necessary to prepare a scaffold or a stepladder every time, and it is difficult to complete the confirmation work in a short time, and there is also a possibility that a confirmation failure may occur. In addition, since the drift pins are used in large quantities, the cost is extremely important, and the method of making the shape complicated and attaching accessories separately increases the purchase price even if it is convenient, Moreover, since the amount of work increases, there are few opportunities for actual use.

  The present invention has been developed on the basis of such circumstances, and an object thereof is to provide a drift pin that can be easily visually recognized from below even when it is driven into a high-place wood, and that is excellent in cost.

The invention according to claim 1 for solving the above-mentioned problem is characterized in that the tip surface is provided with a concave portion recessed in a bowl shape to reflect incident light in the reverse direction. It is a drift pin.

  The drift pin is used to integrate the connecting hardware or shaft and the wood, and as described above, it is a circular cross-section metal rod, which is driven into a pin hole processed in the wood, and the outer surface of the drift pin and the pin It is fixed in the wood by friction with the inner peripheral surface of the hole. The tip surface is the end surface of the drift pin that is the leading end of the drift pin when it is driven into the wood, and a tapered introduction portion is formed on the outer edge so that it can smoothly enter the pin hole. ing. When driven in by this introduction portion, the inner diameter of the pin hole can be smoothly expanded, and a predetermined friction can be ensured while preventing cracking of the wood.

  In addition, the introduction part should just ensure the length which does not have trouble at the time of driving. Therefore, it is not necessary to make the tip surface completely conical, and only the outer edge portion of the tip surface may be conical, and the inside may be cut off at right angles to the axial direction (longitudinal direction of the drift pin). . The side opposite to the front end surface is a rear end surface, and when driving, the rear end surface is hit with a tool such as a kanachi.

A recessed part is a hollow formed in the center part of the front end surface . The bowl shape is a shape in which the central portion is deepest when viewed from the cross section and gradually becomes shallower toward the outer periphery. However, the detailed shape of the concave portion is free, and in addition to a form in which the depth increases linearly from the outer periphery toward the center, it may be a parabolic shape or an arc shape like a concave mirror, and further, with respect to the diameter of the concave portion It can also be wedge-shaped with a large depth.

  When the drift pin having the concave portion is driven horizontally into the wood at a high place, the upper half of the concave portion inevitably becomes a downward surface. Therefore, the light irradiated from below has a small incident angle with respect to the downward surface, and is reflected almost in the reverse direction. Therefore, when light is applied from below to the fastening portion at a high place with a flashlight or the like, the light reflected by the upper half of the concave portion is directed downward again, and the presence of the drift pin can be easily confirmed. In addition, since the conventional drift pin does not have a recessed part, the incident angle with respect to the front end surface of light from below increases, and the reflected light goes further upward, so it is difficult to confirm the presence of the drift pin. In addition, even when a flashlight as described above is not used, when natural light enters perpendicularly to the recess (incident angle is 0), a part of the light is inevitably reflected downward, contributing to improved visibility. To do.

  The concave portion can be formed not only on the front end surface but also on the rear end surface. Since the rear end surface inevitably has almost no difference from the surface of the wood when the driving into the wood is finished, the rear end surface can be easily visually recognized from the lower side. Therefore, it is not necessary to form a recess. However, when the rear end surface is pushed deeper than the surface of the wood, or when it is desired to improve the reliability of the confirmation work, a concave portion may be provided on the rear end surface.

The invention according to claim 2 shows a specific example of the concave portion, and the surface of the concave portion is a rough surface on which fine irregularities are continuously formed . A fine unevenness is a groove or hole formed by pressing a blade or the like into the recess and having a depth of less than 1 mm, or a protrusion having a height of less than 1 mm. Instead, they are arranged continuously at a predetermined interval. By forming such a rough surface, the light incident on the tip surface is diffusely reflected and part of it travels in the opposite direction. Visibility is improved. In particular, the visibility can be improved in combination by making the surface of the recess rough.

The invention described in claim 3 is for further improving the visibility, and the surface of the recess is coated with a paint. The concave portion and the rough surface efficiently reflect light downward as described above, but a coating material may be applied to the concave portion so that the reflected light can be more easily recognized. The paint used here is a reflective paint widely used for traffic accident countermeasures, a fluorescent paint that emits a color different from the irradiated light, a phosphorescent paint having afterglow, and the like.

In addition, the concave part inevitably prevents contact with other objects, so there is little possibility of paint peeling off due to vibration during transportation, and even if the tip surface is intentionally struck with a tool, The tool does not enter the recess, the paint is less likely to come off, and the durability is excellent. Also, the paint may protrude from the recess for work convenience.

According to the first aspect of the present invention , a drift pin that is driven horizontally into wood at a high place is formed by forming a bowl-shaped recess on the tip surface of the drift pin so that incident light can be reflected in the opposite direction. When light is irradiated from below toward the surface, the incident angle with respect to the upper portion of the concave portion becomes small, and thus the light reflected here travels downward. Therefore, without using a stepladder etc., if you hit the light with a flashlight etc. from below, you can easily see the presence of the drift pin driven into the wood above, you can carry out the confirmation work safely and in a short time, A highly reliable building can be provided to consumers.

  In addition, the present invention can be realized by simply pressing the convex mold in the manufacturing stage of the drift pin, and the manufacturing cost is slight. In addition, no other accessories are required, and the work for driving the drift pin is not different from the conventional one, and the introduction of the present invention is extremely easy.

Further, as in the invention described in claim 2 , the surface of the recess may be a rough surface . The rough surface is a surface on which fine irregularities are continuously formed, can diffusely reflect light, and contributes to improvement in visibility . In addition, formation of a rough surface is realizable only by pressing a cutter to a front end surface, and the increase in manufacturing cost is also slight. In addition, the visibility of the drift pin is further improved by applying a paint to the recess as in the invention of claim 3 .

It is the perspective view and sectional drawing which show the use location of the drift pin by this invention, and the outline | summary. The detail of the drift pin by this invention is shown, (A) is a front view, a left side view, a right side view, and a cross-sectional view of a central portion, and (B) is a cross section depicting a state of light irradiated to a concave portion. FIG. It is sectional drawing which shows the example of a shape of the drift pin by this invention. The detail of the drift pin which formed the rough surface in the front end surface is shown, (A) is a front view of a form which has a line-like rough surface, a left side view, and an enlarged end view of a central part, (B) is They are the front view of the form which has a dotted | punctate rough surface, the left view, and the enlarged end elevation of a center part.

  FIG. 1 shows the location of use of the drift pin 11 according to the present invention and its outline. In this figure, the end surface of the other material 26 is brought into contact with the side surface of the one material 21 to construct a T-shaped fastening portion, and the connecting hardware 31 is arranged at the boundary between the one material 21 and the other material 26, and the drift pin 11 is driven into the side surface of the other material 26. The connection hardware 31 has a U-shaped outer shape, and includes a front plate 32 that contacts the side surface of one material, and a horizontal plate 33 that is inserted into a slit 27 processed on the end surface of the other material 26. 21 and the front plate 32 are integrated by a bolt 38 and a nut 39. Accordingly, a round hole 34 for inserting the bolt 38 is formed in the front plate 32, and a hole penetrating both sides is processed on the side surface of the one material 21 although not shown.

  A locking groove 35 and a locking hole 36 are formed in the horizontal plate 33 of the connecting hardware 31, and the locking groove 35 is for receiving the drift pin 11, and the locking hole 36 is inserted through the drift pin 11. Is to do. The other material 26 has two rows of slits 27 into which the horizontal plate 33 is inserted. Further, a total of three pin holes 28 are formed at positions concentric with the locking grooves 35 and the locking holes 36. Has been processed. Therefore, after inserting the horizontal plate 33 into the slit 27 and driving the drift pin 11 so as to penetrate both, the connecting metal 31 is integrated with the other material 26, and finally with the one material 21 via the connecting metal 31. The other material 26 is fastened.

  In order to confirm whether or not all three drift pins 11 are driven in such a fastening portion, it is necessary to look at the pin hole 28 from the side surface of the other material 26, but this fastening portion is located above the building. In this case, a scaffold or a stepladder is required for the confirmation, which is troublesome as well as troublesome. Therefore, as shown in the AA cross-sectional view, a concave portion 16 (reflecting means) recessed in a bowl shape is formed at the center of the tip surface 12 of the drift pin 11. When the concave portion 16 is irradiated with light from below, since the upper portion of the concave portion 16 is a downward surface, the incident angle is inevitably small, and the reflected light travels downward again. Therefore, as shown in the figure, when light is irradiated from below using an illuminator such as a flashlight, the reflected light reaches the eye of the examiner, and the presence or absence of the drift pin 11 can be easily determined. In addition, if a reflective paint or a phosphorescent paint is applied to the concave portion 16, the visibility is further improved.

  FIG. 2 shows details of the drift pin 11 according to the present invention. FIG. 2A is a front view, a left side view, a right side view, and a cross-sectional view of the central portion, and FIG. It is a state of the light irradiated to the. As shown in FIG. 2 (A), the drift pin 11 according to the present invention has substantially the same shape as a conventional drift pin, cuts a circular cross-section metal rod with a predetermined length, and scrapes off the outer edge of the cut surface. ing. In the conventional drift pin, both ends have the same shape. However, in the present invention, the tip surface 12 that enters the wood at the head when driving, and the kanachi at the time of driving. The shape is different between the rear end face 13 which is hit by the like.

  A conical introduction portion 14 is formed on the outer edge of the distal end surface 12 so that the pin hole 28 processed into the wood can be smoothly spread when driven, and the inside of the introduction portion 14 is A recess 16 is formed. The concave portion 16 has a circular appearance as shown in the left side view and is recessed in an arc shape as shown in the cross-sectional view, and the center portion is deepest. In the drift pin 11 shown in this figure, the recess 16 is formed not only on the front end surface 12 but also on the rear end surface 13.

  By providing the concave portion 16, as shown in FIG. 2B, when the tip surface 12 is irradiated from a position where the crossing angle is large with respect to the axial direction of the drift pin 11, light can be reflected almost in the opposite direction. Even if the pin 11 is used at a high place, it can be easily seen from a low position. This is because the concave portion 16 locally reduces the incident angle with respect to the light emitted from the light source, and the light reflected around the light returns in a direction closer to the light source. In the case of a conventional drift pin that does not have the recess 16, as shown in the figure, the incident angle with respect to the light reaching from below becomes large and further reflects upward, so it is difficult to confirm the presence of the drift pin.

  FIG. 3 shows an example of the shape of the drift pin 11 according to the present invention in cross section. The specific shape of the recess 16 is arbitrary, and there is no limitation on the diameter and depth as long as the incident light can be reflected in an appropriate direction. Therefore, in addition to the arc-shaped concave portion 16 shown in FIG. 2, the depth is increased linearly from the outer edge portion as in shape example 1 in this figure, and only the center portion is finished in an arc shape. Further, as in shape example 2, it is possible to form a shape that has been cut into a wedge-like deep place. Depending on the application, the concave portion 16 may be provided on both the front end surface 12 and the rear end surface 13 as in the first shape example.

  In addition, like the shape example 3, the front end surface 12 and the rear end surface 13 can be formed in the same shape, and the introduction portion 14 and the concave portion 16 can be provided on either end surface so as to be driven from both directions. In this case, a flat portion is provided between the introduction portion 14 and the concave portion 16 in consideration of being hit with a pinch or the like. Various kinds of paint can be applied to the concave portion 16 in order to improve the visibility, but the concave portion 16 does not come into direct contact with kanachi or the like, and the paint is not inadvertently peeled off.

  FIG. 4 shows details of the drift pin 11 in which the rough surface 18 is formed on the front end surface 12. FIG. 4A is a front view, a left side view, and a center portion of the form having the linear rough surface 18. FIG. 4B is a front view, a left side view, and an enlarged end view of the center portion of the embodiment having the dotted rough surface 18. The rough surface 18 in FIG. 4 (A) is a groove formed by pressing a linearly extending cutter against the tip surface 12, and in addition to pressing the cutter continuously at regular intervals, the direction of the cutter is also controlled. The groove is changed to a lattice shape. The rough surface 18 causes the reflected light to return in the direction close to the light source as shown in the figure, so that the visibility is improved for the same reason as before.

  The rough surface 18 in FIG. 4B is formed by continuously forming wedge-shaped holes, and is formed by pressing a needle-like tool, and the effect is the same as that in FIG. In FIG. 4B, the rough surface 18 is formed on the surface of the recess 16, and the synergistic effect of the recess 16 and the rough surface 18 is exhibited.

11 Drift pin 12 Front end surface 13 Rear end surface 14 Introduction portion 16 Recessed portion (reflection means)
18 Rough surface (reflecting means)
21 One material 26 Other material 27 Slit 28 Pin hole 31 Connecting hardware 32 Front plate 33 Horizontal plate 34 Round hole 35 Locking groove 36 Locking hole 38 Bolt 39 Nut

Claims (3)

A drift pin characterized in that the tip surface (12) is provided with a concave portion (16) recessed in a bowl shape to reflect incident light in the reverse direction. The drift pin according to claim 1, wherein the surface of the recess (16) is a rough surface (18) in which fine irregularities are continuously formed . The drift pin according to claim 1 or 2, wherein the surface of the recess (16) is coated with paint .

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