JP2011021690A - Concrete pin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete pin capable of preventing buckling from being generated at the time of placing, and to enhance placing performance. <P>SOLUTION: The concrete pin 1 includes a head 2 formed at one end side of a barrel 4, and a sharp tip 5 formed at the other end side of the barrel 4 to solve the problem, and is driven into concrete by hammering a head 2 side by a hammering face in a driver having the flat hammering face, the head 2 includes a top face 2b to be hammered having a diameter substantially the same to that of the barrel 4, and a guide 2c for preventing turn-down when hammered, and the top face 2b to be hammered, the guide part 2c, the barrel 4 and the tip 5 are formed coaxially in the concrete pin. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a concrete pin used for fixing a metal plate or the like on a concrete surface, and more particularly to a concrete pin designed to prevent the occurrence of buckling during driving.

  Conventionally, for example, the following concrete pins are known. In this prior art, a head having a larger diameter than the trunk and a flat top surface is formed on one end of the trunk, and a bullet-shaped tip having a smaller diameter than the trunk on the other end of the trunk. And a plurality of grooves that are inclined with respect to the axis of the barrel. When fixing a metal plate or the like on a concrete surface, hit a flat head with an automatic nail driver (driver) or the like to drive a concrete pin into the concrete from above the metal plate or the like. A metal plate or the like is pressed in. At the time of driving, the concrete pin is rotated by the inclined groove formed on the peripheral surface of the body portion so that the penetration resistance is reduced. After the driving is finished, the surface area (contact area) is increased by the inclined groove, and the drawing strength is increased. (See, for example, Patent Document 1).

JP 2002-81424 A

  In the prior art described in Patent Document 1, the top surface of the head formed with a larger diameter than the body is formed flat. Here, when the moment when the flat top surface of the head is struck by a driver and the concrete pin is actually driven into the concrete is considered, the concrete pin does not move against the concrete driven surface due to part play or other factors. It is not always possible to stand vertically and hit the flat top surface of the head vertically. In that case, if the end of the flat top surface of the head is struck, it will cause buckling of the concrete pin or poor driving. In addition, in the case where a large number of inclined grooves are formed on the peripheral surface of the body portion as in the above-described prior art, the penetration direction is difficult to be determined at the initial stage of driving. For this reason, the stability in the penetration direction is lacking, and there is a possibility that the above-described problems occur.

  Therefore, a technical problem to be solved in order to prevent buckling from occurring during driving and to improve driving performance arises, and the present invention aims to solve this problem.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that a head formed on one end side of the body portion and a sharp point formed on the other end side of the body portion. A concrete pin that is driven into the concrete when the head side is struck by the struck surface in a driver having a flat struck surface, and the head is substantially the same as the body part. A hitting top surface of the same diameter and a guide portion for preventing a collapse at the time of driving, and the hitting top surface, the guide portion, the trunk portion, and the tip portion are coaxially formed concrete pins. provide.

According to this configuration, when driving, the guide portion is guided by the driving side on the driver side, and the top surface to be hit, the body portion, and the tip portion are formed coaxially, so that it is relative to the concrete driving surface. A tendency to approach concrete pins vertically is given. However, due to the play of the parts and other factors, the concrete pin is usually slightly inclined with respect to the concrete placing surface when driven, and the driver hits the end of the top surface to be hit. At this time, since the hitting top surface is formed to have substantially the same diameter as the body portion, the distance between the center of the head and the operating point of the tapping force is reduced. As a result, the moment force applied to the center of the head is reduced, and the occurrence of stress concentration on the lower surface of the head is suppressed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the head is formed in a truncated cone shape, and the top surface of the truncated cone is formed with the top surface to be hit, and the truncated cone-shaped body. The concrete pin which formed the said guide part in the lower surface in is provided.

  According to this configuration, the top surface having the same diameter as that of the body portion and the lower surface having the required diameter has a truncated top surface having the same diameter as that of the body portion, and prevents falling when driven. A head having a guide portion is realized.

  According to a third aspect of the present invention, in the first aspect of the invention, the head includes a truncated cone-like shaped body having a lower surface portion of the truncated cone formed in a required thickness, and the top of the truncated cone-like shaped body is formed. There is provided a concrete pin in which the hitting top surface is formed by a surface and the guide portion is formed by a lower surface portion having a required thickness in the truncated cone-like shaped body.

  According to this configuration, the top surface having the top surface approximately the same diameter as the body portion and the bottom surface having the required thickness having the required diameter has a truncated cone-like shape, and the top surface to be struck is approximately the same diameter as the body portion. The head provided with the guide part for preventing the fall of the head is realized.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the head is a low-high peak that serves as the top surface to be hit at the center of the upper surface of a disk-shaped body having a required thickness that serves as the guide part. A concrete pin configured by projecting a surface portion is provided.

  According to this configuration, a disc-shaped body having a required diameter and a required thickness, and a low-top surface portion having substantially the same diameter as the trunk portion protruding from the center of the upper surface of the disc-shaped body, A head having a top surface to be hit with substantially the same diameter and a guide portion for preventing the tipping over at the time of driving is realized.

  According to a fifth aspect of the present invention, in the first, second, third, or fourth aspect of the invention, the body is connected to the large-diameter body and the large-diameter body through at least a tapered step. Further, there is provided a concrete pin in which the distal end side is constituted by a tapered barrel portion having a small diameter, and the bullet-shaped tip portion is connected to the distal end of the tapered barrel portion.

  According to this structure, at the time of driving, a smooth intrusion property can be obtained with a tapered body portion having a small diameter on the tip side with respect to the concrete. Further, after the driving, a strong fastening property to the concrete can be obtained with the large-diameter body portion.

  According to the first aspect of the present invention, the moment force applied to the center of the head during driving is reduced, and the occurrence of buckling can be prevented and the driving performance can be prevented by suppressing the occurrence of stress concentration on the lower surface of the head. There is an advantage that can be improved.

  In addition to the effects of the invention described in claim 1, the invention described in claim 2 further includes a head that has a small moment force applied to the center during driving and can suppress the occurrence of stress concentration on the lower surface. There exists an advantage that it can implement | achieve with the truncated cone-shaped body which has easy formability.

In addition to the effect of the invention of claim 1, the invention of claim 3 further includes a head that has a small moment force applied to the center during driving and can suppress the occurrence of stress concentration on the lower surface. It can be realized by a truncated cone-like body having easy formability. Further, there is an advantage that a metal plate or the like can be firmly fastened to the concrete surface at the lower surface portion of the required thickness.

  In addition to the effect of the invention described in claim 1, the invention described in claim 4 further includes a head that has a small moment force applied to the center at the time of driving and can suppress the occurrence of stress concentration on the lower surface. This can be realized with a relatively simple configuration in which a low-high top surface portion is provided at the center of the upper surface of a disk-shaped body having a required thickness. Further, there is an advantage that a metal plate or the like can be firmly fastened to the concrete surface with a disk-shaped body having a required thickness.

  In addition to the effects of the first, second, third or fourth invention, the invention described in the fifth aspect further provides a smooth intrusion property with a tapered body having a small diameter on the tip side with respect to the concrete when driven. Thus, there is an advantage that the driving performance can be further improved.

It is a figure which shows the concrete pin which concerns on the Example of this invention, (a) is a top view, (b) is a front view. The front view which shows the 1st modification of a head in the Example of this invention. The front view which shows the 2nd modification of a head in the Example of this invention. It is a figure for demonstrating the effect | action at the time of implantation, (a) is a figure in the case of the Example of this invention, (b) is a figure in the case of the prior art example as a comparative example.

  In order to achieve the object of preventing the occurrence of buckling during driving and improving the driving performance, the present invention is formed with a head formed on one end of the body and the other end of the body. A concrete pin that is driven into the concrete by hitting the head side with the hitting surface in a driver having a flat hitting surface, and the head includes By having a hitting top surface having substantially the same diameter and a guide portion for preventing a collapse at the time of driving, the hitting top surface, the guide portion, the body portion, and the tip portion are formed coaxially. It was realized.

  A preferred embodiment of the present invention will be described below with reference to FIGS. First, the structure of the concrete pin which concerns on a present Example is demonstrated. As shown in FIGS. 1 (a) and 1 (b), the concrete pin 1 is connected to the body part 4 via a neck part 3 where the lower surface of the head part 2 is gently curved, and is sharp at the lower end of the body part 4. A bullet-shaped tip 5 is connected. The head 2 is composed of a truncated cone-like body in which the bottom surface of the truncated cone 2a is formed to a required thickness. The top surface of the truncated cone-like body is formed with the top surface 2b to be hit by the driver's hitting surface, and the lower surface portion of the required thickness is formed with the guide portion 2c for preventing the tipping over at the time of driving. ing. The guide part 2c has a function of being able to firmly fasten a metal plate or the like to the concrete surface by being formed to a required thickness.

  The trunk portion 4 includes a large-diameter barrel portion 4a, and a tapered trunk portion 4d having a small diameter at the front end side connected to the large-diameter barrel portion 4a via a tapered step portion 4b and a short straight portion 4c. The bullet-shaped tip 5 is connected to the tip of the tapered body 4d. The body portion 4 is a tapered body portion 4d having a small diameter at the front end side, and can smoothly enter the concrete at the time of driving. Moreover, the strong fastening property with respect to concrete is acquired after driving | running | working in the part of the large diameter trunk | drum 4a.

The diameter m of the top surface 2b to be hit in the head 2 is formed to be substantially the same as the diameter n of the large-diameter body 4a in the body 4, that is, m≈n. The top surface 2b to be hit, the guide portion 2c, the body portion 4 and the bullet-shaped tip portion 5 of the head 2 formed of the truncated cone-like shape are coaxially formed.

  FIG. 2 shows a first modification of the head. The head 6 according to the first modification is formed with a top surface 6a to be hit by the hitting surface of the driver at the top surface of the truncated cone, and at the bottom surface of the truncated cone at the time of driving. The guide part 6b for preventing the fall of is formed. In the first modified example, the head 6 that has a small moment force applied to the center of the hitting top surface 6a during driving and can suppress the occurrence of stress concentration on the lower surface of the guide portion 6b has easy formability. It is realized by a truncated cone having a shape.

  FIG. 3 shows a second modification of the head. The head portion 7 according to the second modification is formed by projecting a low-high top surface portion serving as a hitting top surface 7a at the center of the upper surface of a disk-shaped body having a required thickness serving as a guide portion 7b. Has been. In the second modified example, the head 7 that has a small thickness and a small moment force applied to the center of the top surface 7a to be struck and can suppress the occurrence of stress concentration on the lower surface of the guide portion 7b has a required thickness. This is realized with a relatively simple configuration in which a low-high top surface portion is projected from the center of the upper surface of the disk-shaped body. Furthermore, the guide part 7b has a function of being able to firmly fasten a metal plate or the like to the concrete surface by being formed of a disk-shaped body having a required thickness.

  Next, the operation of the concrete pin 1 configured as described above will be described. The concrete pin 1 of the present embodiment is made by hitting the hitting top surface 2b with the hitting surface 8a of a general-purpose driver 8 (see FIGS. 4A and 4B) having a flat hitting surface 8a. Be driven into. At the time of driving, the guide portion 2c is guided by a driving path 9 on the driver 8 side (see FIGS. 4A and 4B), and the top surface 2b to be hit in the head 2, the guide portion 2c, the trunk portion 4 and The tip part 5 is formed coaxially, so that the vertical approach tendency of the concrete pin 1 is given to the placing surface 10a of the concrete 10 (see FIGS. 4A and 4B).

  However, due to play of parts and other factors, the concrete pin 1 is usually slightly inclined with respect to the driving surface 10a of the concrete 10 when driven, and the hitting surface 8a of the driver 8 hits the end of the hitting top surface 2b. . At this time, the diameter m of the top surface 2b to be hit is formed so as to be substantially the same as the diameter n of the large diameter body 4a in the body portion 4, so that the hit from the center of the head, that is, the center of the hit top surface 2b. The length of the perpendicular drawn to the force action line is reduced. As a result, the moment force applied to the center of the head is the product of the tapping force and the length of the perpendicular, so the moment force is reduced. Therefore, the occurrence of stress concentration on the lower surface of the head, that is, the lower surface of the guide portion 2c is suppressed.

  The generation of the moment force applied to the center of the head and the stress concentration on the lower surface of the guide portion will be further described with reference to FIGS. FIG. 4A shows the case of the present embodiment. In order to clearly show the generation of moment force and the like on the drawing, the head 6 having a truncated cone shape having the simple structure shown in FIG. 2 is applied. In addition, the body 4 is simply shown in a straight shape. FIG. 4B shows the case of a conventional example as a comparative example, and the top surface 11a of the head 11 is formed flat. Guides 12 made of a known resin material having the same diameter as each guide portion are press-fitted into each barrel portion in FIGS.

In the case of the present embodiment shown in FIG. 4A, the length of the perpendicular drawn from the center of the head 6 (center of the hitting top surface) C ₁ to the line of action of the tapping force F by the driver 8 is r ₁ . The moment force applied to the center C _{1 of the} head 6 is the product of the tapping force F and the perpendicular length r ₁ (F × r ₁ ). On the other hand, in the case of the conventional example shown in FIG. 4B, the length of the perpendicular drawn from the center C _{2 of the} head 11 to the action line of the tapping force F by the driver 8 is r ₂ . The moment force applied to C ₂ is the product of the tapping force F and the perpendicular length r ₂ (F × r ₂ ).

As shown in FIGS. 4A and 4B, r ₂ is considerably larger than r ₁ . Therefore, the moment force (F × r ₁ ) applied to the center C ₁ of the head 6 in the present embodiment is much higher than the moment force (F × r ₂ ) applied to the center C ₂ of the head 11 in the conventional example. Get smaller. Therefore, in this embodiment, the occurrence of stress concentration on the lower surface of the head 6, that is, the lower surface of the guide portion is suppressed, the occurrence of buckling of the concrete pin is prevented, and the driving performance is remarkably improved. On the other hand, in the conventional example, the stress concentration generated on the lower surface of the head 11 causes buckling of the concrete pin and the driving performance is deteriorated.

  As described above, in the concrete pin 1 according to the present embodiment, the moment force applied to the center of the head 2 is reduced during driving, and the occurrence of buckling is suppressed by suppressing the occurrence of stress concentration on the lower surface of the head 2. In addition, it is possible to improve the driving performance in combination with the fact that a smooth intrusion property can be obtained by the tapered body 4d having a small diameter at the front end side.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  The present invention can also be applied to a concrete pin used in a driving machine such as a gas nailer or a nailing machine, which is indispensable to improve the driving performance by preventing the occurrence of buckling during driving.

DESCRIPTION OF SYMBOLS 1 Concrete pin 2 Head part of truncated cone similar shape 2b Top surface to be hit 2c Guide part 3 Neck part 4 Body part 4a Large diameter body part 4b Tapered step part 4d Tapered body part 5 Shell-shaped tip part 6 Conical shape The head 6a The top surface 6b to be hit 6b Guide portion 7 The head having a shape in which a low and high top portion protrudes from the upper surface of the disc-like body 7a The top surface 7b to be hit 7b Guide portion 8 Driver 8a Flat hitting surface 9 Driving path 10 Concrete 10a Driving surface 11 Conventional head 12 Guide

Claims (5)

A head portion formed on one end side of the trunk portion and a sharp tip portion formed on the other end side of the trunk portion, and the head side is hit by the hitting surface in a driver having a flat hitting surface. A concrete pin that is driven into the concrete by
The head has a hitting top surface having substantially the same diameter as the body portion, and a guide portion for preventing falling during driving, and the hitting top surface, the guide portion, the body portion, and the tip. A concrete pin characterized in that the part is formed coaxially.   The head portion is formed in a truncated cone shape, the top surface of the truncated cone body is formed with the hit top surface, and the guide portion is formed on the lower surface of the truncated cone body. The concrete pin according to 1.   The head comprises a truncated cone-like shaped body in which the lower surface portion of the truncated cone is formed to a required thickness, and the top surface of the truncated cone-like shaped body forms the hit top surface, and the truncated cone-like shape The concrete pin according to claim 1, wherein the guide portion is formed by a lower surface portion having a required thickness in the body.   The head portion is configured by projecting a low-high top surface portion serving as the hitting top surface at a central portion of an upper surface of a disk-shaped body having a required thickness serving as the guide portion. The concrete pin according to 1.   The trunk is composed of a large-diameter trunk, and a tapered trunk having a small diameter at the tip side connected to the large-diameter trunk via at least a tapered step, and at the tip of the tapered trunk. 5. The concrete pin according to claim 1, 2, 3 or 4, wherein said bullet-shaped tip portion is connected.

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