JPH0414668Y2 - - Google Patents

Description

[Detailed description of the invention] a. Field of industrial application The present invention relates to a bolt with a locking mechanism, and in particular, the present invention relates to a bolt with a locking mechanism, and in particular, the invention uses a pin provided in a through hole formed vertically from the upper surface to the lower surface of the bolt head to prevent the bolt from loosening. Concerning new improvements to prevent looseness.

b. Prior Art Conventionally, as disclosed in Japanese Utility Model Application Publication No. 52-127641, a commonly used way to prevent bolts from loosening is to apply adhesive to the threaded portion of the bolt.
A method of fixing the threaded part to a nut or a fastener, a method of fixing the bolt head to a fastener by welding, a method of deforming the threaded part by caulking, or a method disclosed in Japanese Utility Model Application Publication No. 53-116568. As shown in Figure 2, a method is used in which a through hole is provided in the bolt head in a horizontal or diagonal direction and a pin is driven into the hole.

c. Problems to be solved by the invention Since the conventional locking bolts were constructed as described above, they had the following problems.

In other words, the direction in which the adhesive is applied to the threaded part is
Not only the threaded part of the bolt, but also the oil and fat on the female threaded part must be cleaned and removed in advance, and since this female threaded part is recessed, cleaning and removal work is very time-consuming and reduces work efficiency. Ta.

Further, in the method using this adhesive, it is not possible to visually confirm whether or not the loosening has been prevented, which is extremely inconvenient.

In addition, in the case of a method that involves welding, there is a risk that the fastened object may be deformed by the welding heat or that the paint on the finished surface may be damaged.

Furthermore, the method of deforming the threaded portion by caulking does not allow the caulking operation to be performed from the bolt head side, and therefore may not be adopted depending on the arrangement and structure of the fastener.

Furthermore, if a horizontal or diagonal through hole is provided in the bolt head and the pin is driven in,
In the horizontal direction, the pin structure becomes complicated, and in the diagonal direction, the strength of the bolt head becomes an issue, and
Since the pins are driven diagonally, the problem is that the pins are difficult to drive, making the work difficult and making it impossible to increase efficiency.

The present invention was developed to solve the above-mentioned problems.In particular, the present invention is designed to prevent the bolt from loosening by using a pin provided in a through hole formed vertically from the upper surface to the lower surface of the bolt head. The purpose of the present invention is to provide a bolt with a locking mechanism.

d Means for Solving the Problems The locking bolt according to the present invention includes a bolt head integrally formed at the upper part of a rod-shaped longitudinal threaded part, and an axis line of the threaded part extending from the upper surface to the lower surface of the bolt head. This configuration includes a through hole formed in parallel and a pin 4 inserted into the through hole and having a lower end 4a having an acute angle.

e Effect In the locking bolt according to the present invention, the pin is inserted into a through hole that is formed vertically in a direction parallel to the axial direction from the top surface to the bottom surface of the bolt head. By striking vertically downward, the lower part of the pin penetrates the underside of the bolt head and bites into the fastener, completely preventing the bolt from loosening.

f Embodiments Hereinafter, preferred embodiments of the locking bolt according to the present invention will be described in detail with reference to the drawings.

Figures 1 and 2 are for showing the locking bolt according to the present invention; Figure 1 is a cross-sectional view of the bolt, and Figure 2 is a cross-sectional view showing the state in which it is attached to a fastener. .

The bolt indicated by the reference numeral 1 in the figure has a threaded portion 1A having a rod-like longitudinal shape, and a threaded portion 1A having a rod-like longitudinal shape.
A bolt head 2 is integrally provided on the upper part of the bolt head 2, and a through hole 3 is formed at the edge of the bolt head 2, passing through from the upper surface 2a to the lower surface 2b of the bolt head 2.

The through hole 3 is formed parallel to the axis of the threaded portion 1A, and is also formed vertically when the bolt 1 is installed vertically.

Further, a pin 4 whose lower end 4a is formed into an acute angle is inserted into the through hole 3, and the length of the pin 4 is slightly longer than the length of the through hole 3. and the lower end 4a of this pin 4
is flush with the lower surface 2b of the bolt head 2,
The upper end 4b of this pin 4 is connected to the upper surface 2 of the bolt head 2.
It is provided so as to protrude upward from point a.

In the above state, when the pin 4 is driven into the fastener 5 from the state shown in FIG. 1 using a jig (not shown),
Since the lower end 4a of this pin 4 is formed with an acute angle, a ring-shaped raised portion 5aA is generated on the surface 5a of the fastener 5 due to this tube 4a, and this raised portion 5aA (as shown in FIG. ) is in strong pressure contact with the lower surface 2b, this raised portion 5aA
and the bolt head 2 are in the same state as if they were strongly connected.

Therefore, even when the pin 4 is removed from the bolt head 2, for example, the bolt head 2 and the fastener 5 can be prevented from loosening by the raised portion 5aA of the surface 5a of the fastener 5, as described above.
After the pin 4 is driven in, it is preferable to set the pin dimension to such a length that the upper end 4b of the pin 4 is flush with the upper surface 2a of the bolt head 2.

g. Effects of the invention Since the locking bolt according to the invention is configured as described above, the following effects can be obtained.

In other words, the through-hole for guiding the pin is provided running parallel to the axis from the top to the bottom of the bolt head, so simply driving the jig pin vertically will ensure a caulking-like lock. Since the pin enters vertically, the pin driving operation can be performed very easily.

In addition, since the pin provided on the periphery of the bolt head is provided in a through hole that penetrates from the top surface to the bottom surface of the bolt head, the strength of the bolt head does not decrease due to the through hole, and sufficient strength can be maintained. A bolt with a retained bolt head can be obtained.

[Brief explanation of the drawing]

The drawings show a bolt with a locking mechanism according to the present invention. Figure 1 is a cross-sectional view of the bolt, Figure 2 is a cross-sectional view of the bolt installed in a fastener, and Figure 3 shows the main points of Figure 2. FIG. 1A is the threaded part, 2 is the bolt head, 2a is the top surface, 2
b is the bottom surface, 3 is the through hole, 4 is the pin, 4a is the bottom end,
5 is a conclusion.

Claims (1)

[Scope of utility model registration request] A bolt head 2 integrally formed on the upper part of a rod-like longitudinal screw portion 1A, and an upper surface 2 of the bolt head 2.
A through hole 3 is formed extending from a to the lower surface 2b in parallel with the axis of the threaded portion 1A, and a pin 4 is inserted into the through hole 3 and has a lower end 4a having an acute angle. , the lower end 4a of the pin 4
protrudes from the lower surface 2b to form the surface 5a of the fastener 5.
A loosely fastened bolt characterized in that it is configured such that a raised portion 5aA generated from the surface 5a comes into pressure contact with the lower surface 2b by biting in almost perpendicularly to the lower surface 2b.