Lag screw bolt with mounting jig

Abstract

To provide a lag screw bolt with a mounting jig capable of facilitating mounting work for a lag screw bolt that comprises a coupling screw part protruding from a prepared hole Q1.SOLUTION: A lag screw bolt comprises a coupling joint 3 coupled to a rotary tool P. The lag screw bolt is provided with a male screw part 1 embedded in a prepared hole Q1, and a coupling screw part 2 protruding from the prepared hole Q1. The coupling joint 3 is formed into a nut shape. The coupling joint 3 is removably screwed to the coupling screw part 2. A hexagonal rotation assisting tool 4 is provided at the coupling screw part 2 between the male screw part 1 and the coupling joint 3. The coupling joint 3 and the rotation assisting tool 4 are configured to be removed after the male screw part 1 is embedded.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a lag screw bolt with an installation jig that facilitates the installation work of the lag screw bolt. [Background technology]

[0002] A lag screw bolt is a bolt that is embedded in a pilot hole in wood. The diameter of the pilot hole and the root diameter of the male thread are approximately the same, so the lag screw bolt is screwed into the pilot hole using a rotary tool such as an impact wrench and embedded, and the connecting part located in the opening of the pilot hole of the lag screw bolt is used to connect other components.

[0003] Various types of lag screw bolts with different shapes of connecting portion are used. The lag screw bolt described in Patent Document 1 has a connecting thread portion that protrudes from a prepared hole. In order to screw this lag screw bolt into the prepared hole, a hexagonal connecting joint that connects to a rotary tool is formed integrally with this connecting thread portion.

[0004] Furthermore, this type of lag screw bolt is also used with connecting joints formed in different positions on the connecting threads (see Figure 8). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7357967 Summary of the Invention [Problem to be solved by the invention]

[0006] The lag screw bolt described in Patent Document 1 is a type in which a connecting joint 3 is formed on the male thread portion 1 side of the connecting screw portion 2 (see Figure 8(A)). When this lag screw bolt is embedded in wood Q up to the position of the connecting joint 3, it is necessary to form a recess called a counterbore Q2 on the surface of the pilot hole Q1 into which the tip of a rotary tool P is inserted (see Figure 9(A)).

[0007] Forming such a counterbore Q2 has the disadvantage of reducing the connection strength on the opening side of the pilot hole Q1. In addition, filling the counterbore Q2 requires filling with epoxy resin or the like, which is a problem in that the filling work requires a lot of effort.

[0008] Therefore, a lag screw bolt is also used in which the connecting joint 3 is provided on the end side of the connecting threaded portion 2 (see Figure 8 (b)). This lag screw bolt does not need to form a counterbore Q2 into which the tip of the rotary tool P is inserted.

[0009] However, with this lag screw bolt, the connecting joint 3 protrudes further from the upper end of the connecting thread portion 2 (see Figure 9(b)). Therefore, when connecting another component to the connecting thread portion 2, the protruding connecting joint 3 gets in the way of construction and work. In addition, the protruding connecting joint 3 poses many issues, including danger during work and design problems.

[0010] As described above, lag screw bolts of the type having a connecting thread portion that protrudes from a prepared hole have had various problems during installation work.

[0011] Therefore, the present invention was created to solve the above-mentioned problems, and aims to provide a lag screw bolt with an installation jig that can facilitate the installation work of a lag screw bolt having a connecting thread portion that protrudes from a pilot hole. [Means for solving the problem]

[0012] In order to achieve the above-mentioned object, the first means of the present invention is a lag screw bolt having a male threaded portion 1 embedded in a pilot hole Q1, a connecting threaded portion 2 protruding from the pilot hole Q1, and a connecting joint 3 connected to a rotary tool P, wherein the connecting joint 3 is formed in a nut shape and configured to be detachably screwed onto the connecting threaded portion 2, and a hexagonal rotation assisting device 4 is provided between the male threaded portion 1 and the connecting joint 3, through which the connecting threaded portion 2 is inserted, and the rotation assisting device 4 is configured to be fixed with a tool when the male threaded portion 1 is embedded and the connecting joint 3 is rotated in the reverse direction, and the connecting joint 3 and the rotation assisting device 4 are configured to be removed after the male threaded portion 1 is embedded.

[0013] In the second means, a washer portion 5 for inserting the connecting screw portion 2 is provided detachably on the connecting screw portion 2 between the upper end of the male screw portion 1 and the rotation assisting tool 4.

[0014] The third means is that the rotation assisting tool 4 is integrally provided with a washer portion 5 through which the connecting screw portion 2 is inserted. [Effects of the Invention]

[0015] According to the present invention, by embedding the male thread portion 1 in the pilot hole Q1 using the connecting joint 3 and the rotation assisting tool 4, there is no need to provide a countersink Q2 as in the past, and furthermore, since the connecting joint 3 and the rotation assisting tool 4 are configured to be removable, the connecting joint 3 no longer interferes with other components.

[0016] Furthermore, by fixing the rotation assisting device 4 with a tool, the male thread portion 1 is prevented from returning when the connecting joint 3 is removed, and only the connecting joint 3 can be easily removed.

[0017] Furthermore, by placing a washer portion 5 between the upper end of the male thread portion 1 and the rotation assisting device 4, the male thread portion 1 can be accurately embedded to the correct position and the male thread portion 1 is strongly prevented from returning when the connecting joint 3 is removed.

[0018] Furthermore, by integrally providing the washer portion 5, into which the connecting screw portion 2 is inserted, with the rotation assisting tool 4, the embedding work can be carried out reliably and easily.

[0019] In this way, the present invention has the unique effect of facilitating the installation of a lag screw bolt having a connecting thread portion that protrudes from the pilot hole Q1. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a perspective view showing an embodiment of the present invention; [Figure 2] 1 is an exploded cross-sectional view showing an embodiment of the present invention. [Figure 3] 1 is a cross-sectional view showing an embodiment of the present invention. [Figure 4] FIG. 2 is a side view of a main part showing an attached state of the present invention. [Figure 5] FIG. 1 is a plan view showing a state in which the rotation assisting device of the present invention is fixed. [Figure 6] FIG. 1 is a side cross-sectional view showing one state of use of the present invention. [Figure 7] FIG. 10 is a partially cutaway side view showing another embodiment of the rotation assisting device of the present invention. [Figure 8] 1(a) and 1(b) are perspective views showing a conventional lag screw bolt. [Figure 9] 1(a) and 1(b) are cross-sectional views showing examples of embedding conventional lag screw bolts. DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention relates to a type of lag screw bolt that has a male thread portion 1 that is embedded in a pilot hole Q1, a connecting thread portion 2 that protrudes from the pilot hole Q1, and a connecting joint 3 that is connected to a rotary tool P (see Figure 1).

[0022] The connecting joint 3 of the present invention is a nut-shaped member provided separately from the connecting threaded portion 2, and is provided so as to be detachably screwed onto the connecting threaded portion 2 (see FIG. 2). In other words, the connecting joint 3 is not formed integrally with the connecting threaded portion 2, but is used as an attachment jig when burying the male threaded portion 1, and is removed from the connecting threaded portion 2 after burying.

[0023] Furthermore, a hexagonal rotation assisting tool 4 is disposed in the connecting threaded portion 2 between the male threaded portion 1 and the connecting joint 3 (see Figure 1). This rotation assisting tool 4 is configured so that after the male threaded portion 1 is embedded in the pilot hole Q1, when the connecting joint 3 is rotated in the reverse direction to be removed, the connecting joint 3 is rotated in the reverse direction while being fixed with a fixing tool R (see Figure 5). By disposing the rotation assisting tool 4 below the connecting joint 3 in this way, when the male threaded portion 1 is embedded in the pilot hole Q1, the connecting joint 3 is supported on the end side of the connecting threaded portion 2, making it easier to connect the rotation assisting tool 4 to the connecting threaded portion 2.

[0024] The illustrated rotation assist tool 4 is formed in a flat hexagonal shape with a larger diameter than the connecting joint 3, and has a thickness greater than the thickness of the fixed tool R, so that the fixed tool R does not interfere with the rotating tool P (see FIGS. 4 and 5). As a result, it becomes possible to connect the connecting joint 3 to the rotating tool P while fixing the rotation assist tool 4 with the fixed tool R.

[0025] In the illustrated example, the rotation assisting tool 4 is formed so that the connecting screw portion 2 passes through the inside of the rotation assisting tool 4 (see FIGS. 3 and 7).

[0026] Furthermore, a washer portion 5 is provided that is placed on the connecting screw portion 2 between the upper end of the male screw portion 1 and the rotation assisting tool 4 (see Figure 3). This washer portion 5 is a member that is inserted through the connecting screw portion 2 and is detachably attached to the connecting screw portion 2. This washer portion 5 is an attachment jig that is removed from the connecting screw portion 2 together with the rotation assisting tool 4 after the male screw portion 1 has been embedded in the pilot hole Q1. Furthermore, this washer portion 5 can also be used as is when connecting other components.

[0027] Figure 7 shows another embodiment of the rotation assisting tool 4. This rotation assisting tool 4 is a hexagonal cylindrical rotation assisting tool 4 with a washer portion 5 integrated into it. The integration method can be welding, cutting, or any other method. Then, the rotation assisting tool 4 with the washer portion 5 is inserted into the connecting thread portion 2 between the upper end side of the male thread portion 1 and the connecting joint 3 (see Figure 1).

[0028] In the method of use of the present invention, the rotating tool P is connected to the connecting joint 3, and the male screw portion 1 is embedded in the pilot hole Q1 of the wood Q (see FIG. 4). After that, when the connecting joint 3 is to be removed by rotating it in the reverse direction, the connecting joint 3 is removed while fixing the rotation assisting tool 4 with the fixing tool R (see FIG. 5).

[0029] At this time, the connecting joint 3 is strongly tightened by the rotational force of the rotary tool P and fixed to the connecting screw portion 2, so there is a risk that the male screw portion 1 will come out of the pilot hole Q1 if the connecting joint 3 is rotated in the reverse direction. Therefore, when rotating the connecting joint 3 in the reverse direction, the rotation assisting tool 4 is fixed with a fixing tool R such as a wrench, and the connecting joint 3 is then rotated in the reverse direction to remove it (see Figure 5).

[0030] After removing the connecting joint 3, the rotation assisting tool 4 and washer 5 are also removed, and other components such as a fixing nut S and washer T are connected to the connecting screw part 2 to fix the other components to the wood Q (see Figure 6). As a result, it is possible to use only the connecting screw part 2 without forming a counterbore as in the conventional method, and without the interference of the protruding connecting joint 3.

[0031] In addition, in the present invention, the structure, dimensions, materials, and method of use of the connecting joint 3, rotation assisting device 4, and washer portion 5 are not limited to the examples shown in the drawings, and can be changed as desired within the scope that does not change the gist of the present invention. [Explanation of symbols]

[0032] P rotary tool Q wood Q1 Pilot hole Q2 Reeling R Fixed tool S fixing nut T washer 1 Male thread 2 Connecting screw part 3 Connecting joints 4 Rotation aids 5 Washer part

Claims

1. A lag screw bolt having a male thread portion embedded in a pilot hole, a connecting thread portion protruding from the pilot hole, and a connecting joint for connecting to a rotary tool, The connecting joint is formed in a nut shape and is provided so as to be detachably screwed to the connecting screw portion, and a hexagonal rotation assisting tool is provided between the male screw portion and the connecting joint and through which the connecting screw portion is inserted, The rotation assisting tool is configured to be fixed with a tool when the male thread portion is embedded and the connecting joint is rotated in the reverse direction, A lag screw bolt with an attachment jig, characterized in that the connecting joint and the rotation assisting tool are removed after the male thread portion is embedded.

2. 2. The lag screw bolt with mounting jig according to claim 1, wherein a washer portion for inserting the connecting thread portion is detachably provided on the connecting thread portion between the upper end of the male thread portion and the rotation assisting tool.

3. 2. The lag screw bolt with mounting jig according to claim 1, wherein the rotation assisting tool is integrally provided with a washer portion through which the connecting thread portion is inserted.

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