JPH031614Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention has a reliable fall-off prevention function and is easy to attach and detach, like a fastener mechanism for fastening the stabilizer of a towed vehicle towed by an aircraft or helicopter. This invention relates to a fastener mechanism that requires ease of operation.

[Conventional technology]

Towed vehicles towed by aircraft or helicopters (hereinafter referred to as mother aircraft) are widely used for military purposes to carry magnetic detectors. by the way,
A magnetic detector detects changes in the earth's magnetic field, and is an extremely effective device for discovering submarines. However, it is a sensor that uses optical magnetic resonance to detect changes in the surrounding magnetic field, and is sensitive to noise, etc. It is extremely critical to external disturbances. Therefore, it is mounted on a towed vehicle that is towed by a mother aircraft so that it is not affected by noise generated by the mother aircraft. Since its function is originally to detect magnetic fields, it must be ensured that it is not affected by disturbances in the earth's magnetic field caused by the mother machine itself, and from this point of view, it is preferable to operate it as far away from the mother machine as possible. Also, of course, materials that would disturb the earth's magnetic field cannot be used in the towing vehicle itself. Therefore, towing bodies are usually constructed only of non-magnetic materials such as various plastic materials and beryllium-copper alloys.

FIG. 2 is a diagram showing the appearance of a conventional towing body, and FIG. 3 is a partially detailed diagram of FIG. 2. In the figure, 1 is the main body of the towing vehicle in which a magnetic detector (not shown) is housed, and 2 is a cable that electrically connects the mother aircraft and the towing vehicle, as well as a cable for towing the towing vehicle by the mother aircraft. , 3 is a stabilizer for keeping the flying attitude of the towed vehicle parallel, and 4 is a fastener for mechanically coupling the main body 1 and the stabilizer 3. The fastener 4 consists of a stud 6 having a male threaded portion 5 formed at its tip, and a receptacle 8 having a female threaded portion 7. The female threaded portion 7 is provided with a slot parallel to the axis (not shown), and the stud 6 and the receptacle 8 are connected by the action of a coil spring 9 fitted on the outer side of the female threaded portion 7. The bond between the two countries has become more secure.

Next, it will be explained why the main body 1 and the stabilizer 3 are fastened together so that they can be separated as described above.

The shape of the stabilizer 3 is determined by the aerodynamic characteristics of the towed vehicle, and its outer diameter (A in FIG. 2) is generally much larger than the outer diameter of the main body (B in FIG. 2). by the way,
The main body 1 in which the magnetic detector is housed needs to be protected from external magnetic fields when not in use, and is usually housed in a container made of magnetically shielding material (for example, permalloy). here,
If the main body 1 and the stabilizer 3 were to be stored in a container while being integrated, the container would be very large and difficult to handle. For this reason, it is required to be able to separate the main body 1 and the stabilizer 3 except during operation, and they are fastened together using fasteners 4.

[Problem that the invention attempts to solve]

The conventional towing vehicle described above has the following problems. In short, there is a problem with the durability of the fastener. In the conventional fastener shown in FIG. 3, loosening prevention relies on the frictional resistance of the threaded portion, and if the threaded portion wears out due to repeated use, the reliability of the fastening will drop significantly. Even if the threaded portion wears out, the frictional force of the threaded portion can be compensated to some extent by the action of the coil spring, but this also has a limit due to the number of times it can be attached and detached. Moreover, it is extremely difficult to check dimensionally how much wear has occurred.
Generally, the actual situation is to monitor the tightening torque and manage the time to replace the fastener based on the degree of decrease in this torque. Needless to say, since such management is required, the work of connecting the main body and the stabilizer becomes extremely inefficient.

Now, as mentioned earlier, a towed vehicle is operated by being towed by a mother aircraft and flying through the air. Therefore, if a situation occurs in which the fastener comes off during operation, the stabilizer may fall, resulting in a catastrophe. From the above background, there is a strong desire for a fastener mechanism that has a reliable fall-off prevention function and is easy to attach and detach.

[Means for solving problems]

The fastener mechanism according to this invention has a cylindrical first round hole in the center that is parallel to the axial direction, and has a second round hole that is smaller than the first round hole at one end and is parallel to the axial direction. At least two or more parallel slotted grooves are provided, a first internal threaded portion having an outer diameter larger than the first round hole is formed at the other end, and the slotted groove at the one end A second male threaded portion having a larger outer diameter than the first female threaded portion is formed on the outer periphery of the portion where the bolt is provided. The second object to be fastened has a second female threaded portion formed at one end that is compatible with the second male threaded portion, and the other end is formed with the second female threaded portion that is compatible with the second male threaded portion. A receptacle having a third round hole matching the outer diameter of the portion of the stud where the slotted groove is provided is installed, and a receptacle having a third round hole matching the outer diameter of the portion of the stud where the slotted groove is provided, and a first female screw threaded portion matching the first female screw portion at one end thereof is installed inside the stud. It has a male threaded part, and a groove part perpendicular to the axial direction is formed on the outer periphery of the other end, and furthermore, the outer diameter of the central part is adapted to fit the first round hole, and a lock pin is inserted therein. It is something.

[Effect]

In this invention, after the stud is connected to the second female threaded part of the receptacle by the second male threaded part, an end face having a slotted groove is provided on the receptacle by inserting a lock pin into the inside of the stud. Since it is pushed wider than the third round hole, it is fastened to the receptacle so that it will not come off in the axial direction, and a reliable loosening prevention mechanism can be realized.

〔Example〕

FIG. 1a is a sectional view showing the fastener mechanism according to this invention, and FIG. 1b is a view seen from the direction C in FIG. 1a.

In the figure, 1 is the first fastened object (hereinafter referred to as the main body as it is the main body of the towing vehicle in this embodiment);
3 is a second fastened object (hereinafter referred to as stabilizer because it is a stabilizer of a towing vehicle in this embodiment);
6 is a stud, 8 is a receptacle, and 10 is a lock pin. The stud 6 is provided with a cylindrical first round hole 11 inside, a second round hole 12 slightly smaller than the first round hole at one end, and a second round hole 12 slightly smaller than the first round hole at the other end. The first one with a large outer diameter
A female threaded portion 13 is provided. Furthermore, four slotted grooves 14 parallel to the axial direction are provided on the end surface side of the stud 6 where the second round hole 12 is located, and when the slotted grooves 14 are formed, the first slotted grooves 14 are formed. A second male threaded portion 15 having a larger outer diameter than the female threaded portion 13 is formed. The stud 6 is inserted into the mounting hole 16 of the main body 1 and is engaged by the second male threaded part 15 with a second female threaded part 18 formed in the receptacle 8 which is attached to the stabilizer 3 with a rivet 17. There is. Further, a lock pin 10 is inserted into a cylindrical first round hole 11 inside the stud 6. One end of the lock pin 10 is provided with a groove 19 perpendicular to the axial direction, and the other end is formed with a first male thread 20 that engages with the first female thread 13 of the stud 6. Here, the lock pin 10 is attached to the end 2 of the stud 6 where the slotted groove 14 is provided.
1 is pushed out to prevent the stud 6 from coming off in the axial direction (direction D in the figure). Further, the end 21 of the stud 6 fits into a groove 19 provided at the tip of the lock pin 10 itself, so that it cannot be pulled out in the axial direction (direction D in the figure). Note that the stud 6 must always apply a compressive force to the lock pin 10 at its end 21. Therefore, the material of the stud 6 must have spring properties. For example, beryllium copper alloy is extremely convenient because it has spring properties and is a non-magnetic material. This is because, as mentioned above, materials that disturb the earth's magnetic field (that is, magnetic materials) cannot be used in towing vehicles equipped with magnetic detectors.

As explained above, in the fastener mechanism according to this invention, loosening of the stud 6 is prevented by the action of the lock pin 10 pushing the end portion 21 of the stud 6 apart. That is, since it does not rely on the frictional resistance between the second male threaded part 15 and the second female threaded part 18 as in the conventional case, it is possible to provide a fastener mechanism with excellent durability and a loosening prevention function. be. As mentioned above, such a fastener mechanism is extremely useful as a means for connecting the stabilizer to the main body of a towed vehicle towed by a mother aircraft.

[Effect of idea]

As explained above, this invention has the effect of realizing a fastener mechanism having a simple structure, reliable and durable loosening prevention function by using a lock pin.

[Brief explanation of drawings]

Fig. 1a is a sectional view showing the fastener mechanism according to this invention, Fig. 1b is a view seen from the direction C in Fig. 1a, Fig. 2 is a view showing the appearance of a conventional towing body, Fig. 3 is a partially detailed view of FIG. 2. In the figure, 1 is the main body, 2 is the cable, 3 is the stabilizer, 4 is the fastener, 5 is the male thread part, 6
is a stud, 7 is a female thread, 8 is a receptacle,
9 is a coil spring, 10 is a lock pin, 11 is a first
12 is a second round hole, 13 is a first female threaded part, 14 is a slotted groove, 15 is a second male threaded part,
16 is a mounting hole, 17 is a rivet, 18 is a second female threaded portion, 19 is a groove portion, 20 is a first male threaded portion, 2
1 is the end. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] It has a cylindrical first round hole parallel to the axial direction in the center, and a second round hole smaller than the first round hole at one end, and at least two or more parallel to the axial direction. A slotted groove is provided at the other end, and a first female screw portion having an outer diameter larger than the first round hole is formed at the other end, and the slotted groove at the one end is provided. A second male threaded portion having an outer diameter larger than the first female threaded portion is formed on the outer periphery of the portion, and a material having spring properties is further inserted into the attachment hole of the first fastened object. The stud has a first male threaded part at one end that fits with the first female threaded part, and a groove part perpendicular to the axial direction is formed on the outer periphery of the other end, and a groove part perpendicular to the axial direction is formed on the outer periphery of the other end. The lock pin has a diameter adapted to fit the first round hole and is inserted into the stud, and a second female screw portion is formed at one end to fit the second male screw portion, and The other end has a third round hole that matches the outer diameter of the portion of the stud where the slotted groove is provided, and further comprises a receptacle attached to a second object to be fastened. Features a fastener mechanism.