JPH08145036A - Locking device for bolt screw - Google Patents

Abstract

PURPOSE: To provide a locking device for a bolt screw which can be prevented from being subjected to limitation to a number of removals, and which can facilitate working in an extreme surrounding condition without scattering of parts and without the necessity of a special tool. CONSTITUTION: A locking device for a bolt screw is composed of a bolt stopper 2 having a socket part in a spanner-like shape surrounding the side surface of the head part 5 of a bolt, and a spring 4 located between the bolt stopper 2 and a stationary plate 3, for resiliently urging the bolt stopper 2 in its entirely toward the stationary stopper 3 so as to maintain a condition in which socket part surrounds the side surface of the bolt head part. Further, either the stationary plate 3 or the bolt stopper 2 is provided with a protrusion 12 formed in a single shaft and having plural kinds of sizes. Further, the protrusion 12 has a diameter which is less and less toward the front end of the single shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt screw loosening prevention device, and more particularly to a bolt screw loosening prevention device that can be easily used even in an extreme environment and can be attached and detached a plurality of times. Is.

[0002]

2. Description of the Related Art Conventional techniques for preventing loosening of bolts and screws include the use of locking nuts, lock wires, double nuts and pins.

[0003]

However, in the case where the equipment is exchanged and the equipment is repeatedly attached and detached, the locking nut that limits the number of attachments and detachments is inappropriate, and in a limit environment such as space. In the work, there are problems that the work such as the lock wire is complicated, the locking parts such as pins are prevented from being separated, and a special tool is required.

The present invention is intended to solve the above problems. That is, the present invention is not limited to the number of times of attachment / detachment, is easy to work in an extreme environment, has no discrete parts, and does not require a special tool. The purpose is to provide a stop device.

[0005]

To achieve the above object, the present invention provides a bolt stopper having a wrench-shaped socket portion surrounding a side surface of a bolt head, and a bolt stopper provided between the bolt stopper and a fixing plate. A spring for elastically bringing the entire bolt stopper closer to the fixing plate so as to maintain the state in which the socket portion surrounds the side surface of the bolt head; and the fixing plate and the bolt stopper. Either one of
It has projections of several sizes provided on one shaft, and the other has a slot into which the projections fit, and
The outer diameter of the protrusion is reduced toward the tip of the one shaft, and the groove width of the groove is gradually reduced as the bolt screw is loosened.

[0006]

According to the present invention, the bolt stopper having the wrench-shaped socket portion surrounding the side surface of the bolt head, and the socket portion provided between the bolt stopper and the fixing plate surrounds the side surface of the bolt head. In order to maintain the state in which the bolt stopper is provided with a spring that elastically brings the entire bolt stopper closer to the fixing plate, when the socket portion of the bolt stopper is fitted to the bolt head, The spring maintains this condition, thus locking the bolt.

In order to release this lock, the bolt stopper is pulled away from the fixing plate against the force of the spring, further rotated 180 degrees to retract the socket portion, and then the bolt is rotated. Here, since it may be desired to change the direction of the socket portion depending on the rotational position of the newly tightened bolt, in that case, one of the fixing plate and the bolt stopper is provided on one shaft. Has a projection of several sizes, and the other has a slot into which the projection is fitted, and the projection has a smaller outer shape toward the tip of the one shaft. Since the groove width of the groove hole gradually becomes smaller as the bolt screw loosens, the socket portion is adjusted to the optimum direction and then fitted into the newly tightened bolt head portion. That is, one of the protrusions of several sizes is fitted into the optimum slot.

Then, when the newly tightened bolt starts to loosen, the socket portion rotates around the center of the bolt in the loosening direction, and the one protrusion portion moves in the slot in the rotating direction. Slide, and when the outer shape of the projection becomes equal to the groove width of the groove hole, the sliding stops, and the loosening is stopped here.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially sectional front view showing a locked state of an embodiment of the present invention, and FIG. 2 is a plan view of FIG.
FIG. 3 is a partially cutaway sectional front view showing the unlocked state of FIG. 1. 1 and 3, 1 is a bolt,
2 is a bolt stopper, 3 is a fixing plate, 4 is a spring for pulling down the bolt stopper 2 toward the fixing plate 3, 5 is a bolt head, 6 is a side surface of the head 5, 7 is a bolt 1 Marking engraved to detect looseness, 8 is a threaded portion at the tip of the bolt, and 9 and 10 are fastening members fastened with the bolt 1.

As shown in FIG. 2, reference numeral 11 denotes a wrench-shaped socket portion provided on the bolt stopper 2.

In the present invention, the bolt head 5 of the bolt 1 may be a regular octagon or a regular dodecagon, but since it is generally a regular hexagon, it is mainly a regular hexagon in the drawings. FIG.
FIG. 3 is an enlarged front view of a protrusion shaft 19 fixed to a bolt stopper 2. 12, 13, 14, 15, seen in the figure
When shown in plan view, 16 and 17 are circular protrusions whose centers coincide with each other, and the size (outer diameter, that is, outer diameter) decreases in order from top to bottom. That is, the size of the protrusion 12 is the largest and the size of the protrusion 17 is the smallest.

Returning to FIG. 1, 18 is a spring seat, 19 is a protrusion shaft as described above, and 20 is a bolt hole through which the bolt head 5 provided in the fixing plate 3 penetrates.

In FIG. 2, OS is a reference line passing through the rotation center O of the bolt 1, θ is an angle measured in the direction in which the bolt 1 is loosened, and OA, OB, OC, OD, OE, and OF are the angles θ, respectively. 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50
It is about 60 degrees. And, in the fixed plate 3,
A slot 21 into which the protrusions 12 to 17 are fitted is provided.

The groove width of the groove hole 21 is gradually reduced as the bolt screw is loosened, that is, in the direction of the arrow θ. That is, a at the place corresponding to the OA line, b at the OB line, c at the OC line, d at the OD line, e at the OE line, and f at the OF line, These relationships are a>b>c>d>e> f, the groove width a is equal to the outer diameter of the protrusion 12, the groove width b is equal to the outer diameter of the protrusion 13, Width c is protrusion 1
4, the groove width d is equal to the outer diameter of the protrusion 15, the groove width e is equal to the outer diameter of the protrusion 16, and the groove width f is equal to the outer diameter of the protrusion 17.

In the bolt screw loosening preventer constructed as shown in the drawings, the side surface 6 of the bolt head 5 is surrounded by the socket portion 11 of the bolt stopper 2 as shown in FIGS. Since it can be locked and the bolt stopper 2 is elastically lowered by the spring 4, it will not accidentally loosen even if there is vibration. When releasing the lock, lift the bolt stopper 2 by hand as shown in FIG.
The operation is easy because the bolt 1 may be loosened after the socket 11 is retracted from the bolt head 5 by turning it by 0 degree.

To tighten the new bolt, the reverse operation of the above-mentioned loosening procedure may be performed. However, depending on the tightening rotation position of the newly tightened bolt, the direction of the socket portion 11 as shown in FIG. Since the bolt head 5 does not always match, the direction of the socket 11 may be changed. In that case, first, the bolt stopper is adjusted so that the socket portion 11 is in the optimum orientation, and then the socket portion 11 is fitted to the newly tightened bolt head portion 5.

At this time, depending on the orientation of the socket portion 11, only one of the protrusion portions 12 to 17 of different sizes provided on the bolt stopper 2 is fitted into the groove hole 21 at an optimum groove width. Will be able to. For example, if the protrusion 14 is the third protrusion 14 from the top in FIG. 4, since the outer diameter of the protrusion 14 is equal to the groove width c and smaller than the groove width b, the fitting position is the groove width b of the groove hole 21. And c.

In this way, when the newly tightened bolt starts to loosen, the socket portion 11 rotates around the center of the bolt in the loosening direction (direction of the arrow θ), and the one protrusion 14 Slides in the groove hole 21 in the direction of rotation, and this sliding is continued until the outer diameter of the protrusion 14 and the groove width of the groove hole 21 become equal. Since the sliding stops here, the loosening is stopped.

In the embodiment of FIG. 2, since the angle between the OB line and the OC line is 10 degrees, the looseness of the bolt 1 is limited to within 10 degrees.

In the illustrated example, the bolt stopper 2 is provided with the projections 12 to 17 and the fixed plate 3 is provided with the groove 21, but this may be reversed. That is, in the present invention, the fixing plate may be provided with the protrusion and the bolt stopper may be provided with the slot.

[0021]

As described above, according to the present invention,
A bolt stopper having a spanner-shaped socket portion surrounding the side surface of the bolt head, and a socket provided between the bolt stopper and the fixing plate so that the socket portion maintains a state surrounding the side surface of the bolt head, Since the entire bolt stopper is provided with a spring that elastically approaches the fixing plate, it is possible to lock the bolt stopper with the socket portion of the bolt stopper having the side surface of the bolt head surrounded. Since the stopper is elastically actuated by the spring, it will not accidentally loosen even if there is vibration. Therefore, it is possible to easily prevent the loosening of the environment in which the work content is limited and the device which is repeatedly attached and detached. Moreover, according to the present invention, one of the fixing plate and the bolt stopper is
It has a protrusion of several sizes provided on one shaft, and the other has a slot into which the protrusion is fitted, and the protrusion is closer to the tip of the one shaft. The outer shape becomes smaller as it goes, and the groove width becomes gradually smaller as the bolt screw loosens.Therefore, when changing the direction of the socket depending on the tightening rotation position of the bolt head, One of the seed-sized protrusions can be fitted into the optimum location of the slot, and therefore the orientation of the socket portion can be adjusted according to the rotational position of the bolt head for optimal locking.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing a locked state according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partially cutaway sectional front view showing the unlocked state of FIG. 1.

FIG. 4 is an enlarged front view of a protrusion shaft provided on the bolt stopper of FIG. 1.

[Explanation of Codes] 1 bolt 2 bolt stopper 3 fixing plate 4 spring 5 bolt head 6 side surface 11 socket portion 12 to 17 protrusion 21 groove hole

Claims (2)

[Claims] 1. A bolt stopper having a wrench-shaped socket portion surrounding a side surface of a bolt head, and a state in which the socket portion is provided between the bolt stopper and a fixing plate and surrounds a side surface of the bolt head. A spring for elastically bringing the entire bolt stopper closer to the fixed plate so as to maintain, and one of the fixed plate and the bolt stopper,
It has projections of several sizes provided on one shaft, and the other has a slot into which the projections fit, and
The outer diameter of the protruding portion is reduced toward the tip of the one shaft, and the groove width of the groove hole is gradually reduced as the bolt screw is loosened. Locking device. 2. A bolt stopper socket portion has a wrench shape for operating a bolt head portion, and a projection and a slot which allow the direction of the socket portion to be adjusted are provided in a direction in which a bolt screw is loosened. 6. Six types are provided so that the range from 60 degrees to 60 degrees can be adjusted every 10 degrees.
Bolt screw loosening prevention device described.