JPH0663271U - Bolt tool - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the hexagon socket head cap screw is tightened or loosened with an impact force such as a hammer, and the hexagon socket head cap bolt is facing downward, the work is safe and smooth. Provided is a wrench-type bolt tool that can be used. [Structure] A magnet attachment for the bolt head is attached to a wrench that fits the tip into a non-circular hole in the head of the bolt and turns a handle to tighten or loosen the bolt.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tool used for tightening or loosening a hexagon socket head cap screw.

[0002]

[Prior art]

 For a bolt with a hexagonal hole in the head, use a wrench to tighten or loosen it, fit the hexagonal tip of this wrench into the hexagonal hole, and turn the handle of the wrench to rotate the bolt. Can be used, and the mouth of the wrench head is fitted around the bolt head, and unlike the case where rotational force is applied by the wrench, the spanner head is placed around the bolt head. There is no need to provide a space, and there is an advantage that a recessed hole is provided in the seat surface of the bolt fastening part and the bolt head is housed in this recessed hole to prevent the bolt head from protruding from the seat surface.

The hexagon socket of the hexagon socket head cap bolt cannot be so deep in order to ensure the strength of the bolt head. RF = M between the diameter R of the hexagonal hole (average diameter), the rotational force M applied to the bolt, and the shearing force F (average shearing force) acting on the fitting interface between the wrench tip and the hexagonal hole. Therefore, if the diameter R of the hexagonal hole is too small, the shearing force F becomes large and the inner contour of the hexagonal hole is easily deformed. Therefore, it is necessary to increase the diameter R of the hexagonal hole to some extent.

[0006] Thus, in the hexagon socket of the hexagon socket head cap screw, the depth is considerably shallower than the diameter due to the above restrictions on the depth and diameter. For example, in the case of the M27 hexagon socket head cap screw, The hole diameter is 21 mm and the depth is 11 mm, which is considerably shallow.

[0005]

[Problems to be solved by the device]

 In this way, the hexagon socket head cap bolt has a much shallower hole depth than the hexagon socket head diameter, and the fitting condition of the wrench tip is poor. When a bolt is tightened or loosened by applying a specific rotational force, the wrench tip may be easily disengaged due to vibration due to the impact load, which may cause an accident.

In particular, when tightening or loosening the downward hexagon socket head cap screw, it is usually difficult to visually check the fitting state of the end portion of the wrench, and it is necessary to rely on the feel of the hand, which is a problem. If the hammer is hit with the above, the risk of an accident due to the wrench coming off is extremely high.

The object of the present invention is to secure and smooth the work even if the hexagon socket head cap screw is tightened or loosened by an impact force such as a hammer and the hexagon socket head cap bolt is facing downward. Another object of the present invention is to provide a wrench-type bolt tool that can be used in the above.

[0008]

[Means for Solving the Problems]

 The bolt tool of the present invention is characterized in that the tip of the bolt is fitted in the non-circular hole of the bolt head, and the magnet attachment to the bolt head is attached to the wrench that tightens or loosens the bolt by turning the handle. This is the configuration.

[0009]

[Action]

 Since the tip of the wrench is fitted into the hexagonal hole of the bolt head with the magnetic attachment magnetically attracted to the head of the non-circular hole, for example, the hexagonal head bolt, the impact force due to hammering etc. Even when vibration is generated when a rotating force is applied, or when the wrench tip is fitted from below into the hexagonal hole of the head of the downward hexagon socket head bolt, the mated state can be maintained stably. .

Therefore, the tightening / loosening work of the hexagon socket head cap screw can be performed safely and smoothly.

[0011]

Embodiments Embodiments of the present invention will be described below with reference to the drawings. 1 (A) is a side view showing an embodiment of the present invention, and FIG. 1 (B) is a cross-sectional view taken along the line of FIG. 1 (A).

In FIG. 1A and FIG. 1B, 1 is a wrench, the tip side of which is bent and formed at a right angle, and the tip 11 of the bent portion is a hexagon socket of a hexagon socket head cap screw. And the horizontal portion is the handle portion 12.

Reference numeral 13 denotes a magnet attachment to the head of the bolt, which is attached by welding or the like at a position where the fitting tip 11 is separated from the wrench tip 110. In the above, the cross section of the wrench tip 11 is substantially equal to the inner contour of the hexagonal hole of the hexagonal socket bolt so that the hexagonal socket can be fitted into the hexagonal hole of the hexagonal socket bolt without any looseness (the hole of the bolt head). May have a non-circular shape other than hexagonal, in which case the cross section of the wrench tip is also non-circular). Further, as shown in FIG. 2, the length of the wrench tip 11 is made slightly shorter than the depth of the hexagonal hole 22 of the bolt 2 in order to bring the magnet attachment 12 into close contact with the upper surface of the bolt head 21 (normally). It is preferable to shorten it by about 1 mm).

In order to tighten or loosen the hexagon socket head cap bolt using the tool of the present invention, as shown in FIG. 2, the wrench tip 11 is fitted into the hexagon socket 22 of the bolt head 21 and the handle 12 A desired rotational force determined by the product of the horizontal component of the horizontal force (component in the direction perpendicular to the handle) and the length of the handle 12 is applied to the bolt 2.

In this case, even if the force applied to the handle 12 is an impact force due to hammering or the like and vibration occurs, or even if the head of the hexagon socket head cap screw faces downward, the bolt head 21 By appropriately setting the magnetic attraction force of the magnet attachment 13 with respect to the wrench, the wrench tip 11 can be securely prevented from coming off the hexagonal hole 22, and the hexagon socket bolt 2 can be tightened or loosened safely and smoothly. It can be carried out.

Moreover, the depth of the hexagonal hole 22 is shallow, or the diameter of the hexagonal hole 22 is relatively large as compared with the depth of the hole, so that the fitting state of the wrench tip 11 to the hexagonal hole 22 is small. Even if it is slammed, the magnetic attachment of the magnet attachment 13 to the bolt head 21 can well prevent the wrench tip 11 from coming off the hexagonal hole 22. Therefore, the work safety and the smoothness can be improved. Since the depth of the hexagonal hole 22 can be made shallow while holding it, the strength of the bolt head 21 can be sufficiently ensured, and the hole diameter of the hexagonal hole 22 can be increased so that the shearing force acting on the fitting interface e (tightening Alternatively, since the shearing force acting at the time of loosening can be suppressed to be small, the hexagonal hole 22 can be well prevented from being deformed.

In the above description, the magnetic attraction force (magnetic force) of the magnet attachment 13 is set in consideration of the magnitude of the force to be applied, workability in separating the tip of the wrench from the head of the bolt, and the like. In the case of, a strong magnet such as Sm-Co system is used.

In order to increase the magnetic attraction force of the magnet attachment 13, as shown in FIG. 3A, a hexagonal frame edge 131 fitted around the bolt head 21 is attached around the attachment. It can also be provided.

If the magnetic attraction force of the magnet attachment 13 is too strong, it becomes difficult to separate the wrench tip from the bolt head at the end of the bolt tightening / loosening work. it is necessary to reduce the, in this case, as shown in (b) of FIG. 3, in the example of the hole 132 may be drilled in the magnet attachment 13 (in FIG. 3 (b), each angle 90 ^0, total 4 holes are drilled).

The magnet attachment 13 may be made of metal such as magnetic steel or the like, as well as rubber or plastic containing magnet powder. Depending on the material of this magnet attachment, as shown in (c) of FIG. 3, a flexible elastic foam body 133 may be covered except for the surface contacting the bolt head to protect it from external damage. You can Also, when tightening or loosening high temperature bolts such as disassembling the mold in use, heat treatment can be applied depending on the material of the magnet attachment.

[0021]

[Effect of device]

 The bolt tool of the present invention is configured as described above, and when tightening or loosening the hexagon socket head bolt with the wrench, even if an impact force such as a hammer hit is used, or if the hexagon socket head bolt is facing downward, Even if there is, the fitting of the tip of the wrench to the head of the bolt can be reliably held by the magnetic attraction force, so that the work can be performed safely and smoothly.

Further, it is possible to work alone, and it is possible to reduce the work cost.

[Brief description of drawings]

FIG. 1A is a side view showing an embodiment of the present invention,
1B is a cross-sectional view taken along the line of FIG.

FIG. 2 is an explanatory view showing a usage state of the tool of the present invention.

FIG. 3A is a sectional explanatory view showing a main part of another embodiment of the present invention, and FIG. 3B is a plan explanatory view showing a main part of another embodiment of the present invention; FIG. 3C is a cross-sectional explanatory view showing a main part of another embodiment of the present invention other than the above.

[Explanation of symbols]

 1 Wrench 11 Tip 12 Handle 13 Magnet Attachment

Claims (1)

[Scope of utility model registration request] 1. A tip portion is fitted into a non-circular hole of a bolt head,
A bolt tool characterized by attaching a magnetic attachment to the head of the bolt to a wrench that tightens or loosens the bolt by turning the handle.