JP7515263B2 - Tightening aid tool - Google Patents

Description

The present invention relates to the structure of an auxiliary tool for tightening bolts that is combined with a tool for tightening bolts.

Conventionally, a tool has been known that has a working part at one end of a shaft body that fits into the head of a bolt, and a handle part at the other end of the shaft body. The working part of the tool is inserted into the bottom of a deep hole or a narrow space surrounded by a structure to loosen or tighten the bolt (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 9-150373

According to the tool disclosed in Patent Document 1, if the head of the bolt can be accessed from the axial direction of the bolt, the bolt can be tightened. However, if there is an obstacle in the axial direction of the bolt, the tool cannot be used. In addition, in places where there is an obstacle in the axial direction of the bolt, a tightening tool such as a hexagonal wrench or monkey wrench may be used. For example, when tightening a bolt using a hexagonal wrench, the length of the hexagonal wrench may be short, resulting in insufficient tightening torque. In such cases, a straight pipe is fitted to the end of the hexagonal wrench as an auxiliary tightening tool, and the worker applies force to the pipe to ensure the tightening torque. However, when a straight pipe is used, the range in which the pipe can be moved is narrow due to surrounding obstacles, resulting in reduced work efficiency.

The present invention aims to solve the above problems by providing an auxiliary tool for tightening bolts that can ensure the efficiency of bolt tightening work even if there are obstacles in the vicinity.

The tightening auxiliary tool of the present invention comprises a column-shaped base portion, a first end portion extending from one end of the base portion in a second direction intersecting a first direction in which the base portion extends, and a short portion extending along a third direction intersecting the first and second directions, the short portion having a central portion joined to the other end opposite the one end of the base portion, a second end portion at one end, and a third end portion at the other end, the first end portion, the second end portion, and the third end portion are formed in a tubular shape so that a tool can be freely inserted from the end face, the angle at which the base portion and the first end portion intersect is greater than the angle at which the base portion and the short portion intersect, the length dimension of the base portion is longer than the length dimension of the short portion, and the length dimension of the first end portion is shorter than the length dimension of the short portion .

The tightening auxiliary tool according to the present invention has the above-mentioned configuration, so that even if there are obstacles in the vicinity, the tightening auxiliary tool can be rotated around the central axis of either the first end, the second end, or the third end into which the tool is inserted, thereby changing the direction in which the tightening auxiliary tool extends and tightening the bolt. This makes it possible to increase the amount of rotation of the bolt obtained by moving the tightening auxiliary tool, improving the efficiency of the bolt tightening work.

1A to 1C are three-view diagrams of a tightening assist tool 100 according to a first embodiment. 1 is a diagram showing an example of a state in which a tightening assist tool 100 according to a first embodiment is used; 1 is a diagram showing a state in which a tightening auxiliary tool 1100, which is a comparative example of the tightening auxiliary tool 100 according to the first embodiment, is used. FIG. 1 is a diagram showing an example of a state in which a tightening assist tool 100 according to a first embodiment is used; 1 is a diagram showing an example of a state in which a tightening assist tool 100 according to a first embodiment is used;

The following describes an embodiment of the present invention based on the drawings. Note that the present invention is not limited to the embodiment described below. Each figure is a schematic illustration, and the relative size and plate thickness of each member are not limited to the dimensions shown. Also, the size relationships of each component member in the following drawings may differ from the actual ones. Also, when the reference numerals attached to each part in the drawings are not accompanied by a suffix (a, b, etc.), they are taken to collectively refer to the reference numerals to which the suffixes are attached.

Embodiment 1.
FIG. 1 is a three-view diagram of the tightening auxiliary tool 100 according to the first embodiment. FIG. 1(a) is a top view of the tightening auxiliary tool 100, FIG. 1(b) is a plan view of the tightening auxiliary tool 100, and FIG. 1(c) is a bottom view of the tightening auxiliary tool 100. The tightening auxiliary tool 100 is used when tightening or loosening a fastening element such as a bolt 81 (see FIG. 2). For example, an operator can easily apply a torque sufficient for tightening or loosening the bolt 81 by inserting a tool such as a hexagonal wrench or an adjustable spanner from the end face 21 of the first end 20 and gripping a part of the short portion 30 side of the tightening auxiliary tool 100 to apply force.

The tightening auxiliary tool 100 includes a columnar base 10. The base 10 is a columnar shape extending linearly, and in the first embodiment, it is a columnar shape, more specifically, a hollow cylindrical shape. The direction in which the base 10 extends is called the first direction. In the first embodiment, the first direction coincides with the x direction shown in FIG. 1. In FIG. 1(b), the upward direction perpendicular to the x direction is the y direction, and the direction perpendicular to the xy plane is the z direction. The tightening auxiliary tool 100 also includes a first end 20 extending from one end 11 of the base 10, i.e., the end 11 in the x direction, in a second direction intersecting with the first direction in which the base 10 extends. The first end 20 is formed in a tubular shape, and is configured so that a tool can be freely inserted. In the first embodiment, the angle θ1 between the first end 20 and the base 10 is set to 160°, but is not limited to this angle. In addition, in embodiment 1, the length of the base portion 10 is set to 420 mm, and the length of the first end portion 20 is set to 90 mm.

In addition, a short portion 30 extending in a third direction intersecting the first and second directions is joined to the other end of the base portion 10, i.e., the end 12 on the opposite side of the x-direction. The short portion 30 is shorter than the base portion 10, and in the first embodiment, the length of the short portion 30 is set to 110 mm. The center of the short portion 30 is joined to the other end 12 of the base portion 10. In the first embodiment, the angle θ2 between the short portion 30 and the base portion 10 is set to 60°, but is not limited to this angle. The short portion 30 has a second end 33 at one end and a third end 34 at the other end. The second end 33 and the third end 34 are formed in a tubular shape and are formed so that a tool can be freely inserted from the end surface 31 and the end surface 32. The base portion 10 is longer than the first end 20 and the short portion 30. Therefore, when the hexagonal wrench 80 is inserted into the first end 20, the second end 33, or the third end 34, the tightening auxiliary tool 100 can apply force to a portion far from the hexagonal wrench 80, making it possible to apply a relatively large force when tightening or loosening the bolt.

As shown in FIG. 1, the base portion 10, the first end portion 20, and the short portion 30 are arranged so that their central axes are on the same plane. That is, the central axes of the base portion 10, the first end portion 20, and the short portion 30 are arranged on the xy plane as shown in FIG. 1. The base portion 10, the first end portion 20, and the short portion 30 are also made of steel pipes. That is, the tightening auxiliary tool 100 is formed by bending a steel pipe or by joining it by means such as welding. In the first embodiment, the tightening auxiliary tool 100 is made of a steel circular tube having a diameter of 30 mm.

Figure 2 is a diagram showing an example of the use state of the tightening auxiliary tool 100 according to the first embodiment. The tightening auxiliary tool 100 is used, for example, when tightening or loosening a bolt 81 by inserting a hexagonal wrench into a hexagonal hole formed in the head of the bolt. Figure 2 shows the head of the bolt 81 as viewed from a perspective along the axial direction of the bolt 81, with the hexagonal wrench 80 inserted into the hexagonal hole in the head of the bolt 81.

2, when tightening the bolt 81, the tightening auxiliary tool 100 can be moved from the state of the tightening auxiliary tool 100A to the state shown in the tightening auxiliary tool 100B. Comparing the state of the tightening auxiliary tool 100A with the state of the tightening auxiliary tool 100B, they are symmetrical with respect to the line C passing through the center of the bolt 81. The tightening auxiliary tool 100 tightens the bolt 81 from the state of the tightening auxiliary tool 100A, and before the tightening auxiliary tool 100 abuts against the obstacle 83, it is rotated 180° around the central axis C1 of the hexagonal wrench 80 while still inserted in the hexagonal wrench 80. Then, the tightening auxiliary tool 100 is reversed to secure the distance from the obstacle 83, and can be tightened further.

As shown in FIG. 2, the tightening assist tool 100 can tighten the hexagonal wrench 80 by an angle of θ3 between obstacles 82 and 83.

Figure 3 is a diagram showing the use state of the tightening auxiliary tool 1100, which is a comparative example of the tightening auxiliary tool 100 according to the first embodiment. The tightening auxiliary tool 1100 according to the comparative example is composed of a straight steel pipe. In this case, the tightening auxiliary tool 1100 can be fitted with the hexagonal wrench 80 to tighten the bolt 81, but the tightening auxiliary tool 1100 can only move within a range from the tightening auxiliary tool 1100A state to the tightening auxiliary tool 1100B state. At this time, the hexagonal wrench 80 and the tightening auxiliary tool 1100A can rotate by an angle of θ4.

2 and 3, the rotation angle θ3 when the bolt 81 is tightened by the tightening auxiliary tool 100 is larger than the rotation angle θ4 when the bolt is tightened by the tightening auxiliary tool 1100 according to the comparative example. The tightening auxiliary tool 1100 according to the comparative example is formed in a straight line, so the range of movement is determined primarily by the obstacles 83 and 84. On the other hand, the tightening auxiliary tool 100 according to the first embodiment can avoid contact with the obstacles 83 and 84 by rotating the hexagonal wrench 80 around the central axis C1. Therefore, the tightening amount of the hexagonal wrench 80 is larger than that of the comparative example.

4 and 5 are diagrams showing an example of the use state of the tightening auxiliary tool 100 according to the first embodiment. The tightening auxiliary tool 100 can move the hexagonal wrench 80 even by using the second end 33 and the third end 34 provided on the short portion 30. When tightening the bolt 81 shown in FIG. 4, the bolt 81 is located behind the obstacle 85 with respect to the working area P, and the obstacle 84 is also located above the bolt 81, so the tightening auxiliary tool 100 is installed in the tightening auxiliary tool 100D state. At this time, the second end 33 and the hexagonal wrench 80 are engaged. On the other hand, when the hexagonal wrench 80 and the third end 34 are engaged in the tightening auxiliary tool 100C state, the obstacle 84 located above and the tightening auxiliary tool 100C come into contact with each other. The tightening auxiliary tool 100 according to the first embodiment has three locations, the first end 20, the second end 33, and the third end 34, into which the hexagonal wrench 80 can be engaged. Therefore, even if the bolts 81 are arranged in a narrow and complicated manner from the working area P where the worker works, as shown in FIG. 4, there is a high degree of freedom in being able to install them on the tool.

As shown in FIG. 5, when the hexagonal wrench 80 is turned from the state of the tightening auxiliary tool 100D in FIG. 4, the tightening auxiliary tool 100E comes into contact with an obstacle 85. At this time, by placing the tightening auxiliary tool 100F so that the third end 34 of the short portion 30 and the hexagonal wrench 80 are engaged, the hexagonal wrench 80 can be rotated further in the tightening direction.

As described above, the tightening auxiliary tool 100 according to the first embodiment has the first end 20, the second end 33, and the third end 34, which are to be fitted with the tool, opened in different directions. In other words, since the first direction, the second direction, and the third direction are set in different directions in the tightening auxiliary tool 100, the tightening auxiliary tool 100 can be fitted with the tool depending on the arrangement of the surrounding obstacles 82 to 85.

In addition, the tightening auxiliary tool 100 according to the first embodiment has a base portion 10 that is longer than the first end 20, the second end 33, and the third end 34, and it is easy to apply force regardless of which of the first end 20, the second end 33, and the third end 34 is engaged with the tool. Therefore, the tightening auxiliary tool 100 can ensure an appropriate tightening torque regardless of the arrangement of the bolt 81, and can also loosen it.

In addition, the tightening auxiliary tool 100 is compact and advantageous for insertion into gaps between obstacles and storage because the central axes of the base portion 10, first end portion 20, and short portion 30 are located on the same plane.

Although the present invention has been described above based on the embodiment, the present invention is not limited to the configuration of the above-mentioned embodiment. For example, the angle between the base portion 10, the first end portion 20, and the short portion 30 can be changed. The lengths of the base portion 10, the first end portion 20, and the short portion 30 may also be changed. The material constituting the tightening auxiliary tool 100 may be a metal other than steel. The base portion 10 is not limited to a hollow member, and may be a solid member. In other words, the base portion 10 may be either a cylindrical member or a rod-shaped member. Furthermore, the first end portion 20 and the short portion 30 may have a circular or polygonal cross-sectional shape as long as they are cylindrical members. In short, we would like to add that the gist (technical scope) of the present invention also includes various modifications, applications, and uses that a person skilled in the art may make as necessary.

1 base part, 11 end, 12 end, 20 first end, 21 end face, 30 short part, 31 end face, 32 end face, 33 second end, 34 third end, 80 hexagonal wrench, 81 bolt, 82 obstacle, 83 obstacle, 84 obstacle, 85 obstacle, 100 tightening auxiliary tool, 100A tightening auxiliary tool, 100B tightening auxiliary tool, 100C tightening auxiliary tool, 100D tightening auxiliary tool, 100E tightening auxiliary tool, 1100 tightening auxiliary tool, 1100A tightening auxiliary tool, 1100B tightening auxiliary tool, C1 central axis, P working area, θ1 angle, θ2 angle, θ3 rotation angle, θ4 rotation angle.

Claims (3)

A column-shaped base portion;
a first end portion extending from one end of the base portion in a second direction intersecting a first direction in which the base portion extends;
a short portion extending along a third direction intersecting the first direction and the second direction,
The short portion is
A central portion is joined to the other end opposite to the one end of the base portion,
a second end at one end and a third end at the other end;
The first end, the second end, and the third end are
The tool is formed in a tubular shape and is formed so that a tool can be freely inserted from an end face of the tool.
The angle at which the base portion and the first end portion intersect is
is larger than the angle at which the base portion and the short portion intersect,
The length dimension of the base portion is
The length dimension of the short portion is longer than the length dimension of the short portion,
The length dimension of the first end is:
A tightening auxiliary tool having a length dimension shorter than that of the short portion . The first end portion and the short portion are
2. The tightening assist tool according to claim 1, which is formed of a metal tube. The central axes of the base portion, the first end portion, and the short portion are
The tightening assist tool according to claim 1 or 2, which is located on the same plane.

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