JPH0227686Y2 - - 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 alloys.

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

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. 5) is generally much larger than the outer diameter of the main body (B in FIG. 5). 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). If the main body 1 and the stabilizer 3 were to be housed in a container while being integrated, the container would become 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. 6, the prevention of loosening relies on the frictional resistance of the threaded portion, and when the threaded portion wears out due to repeated use, the reliability of the fastening is significantly reduced. 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 torque at the time of tightening is monitored, and the timing of fastener replacement is managed based on the degree of decrease in this torque. The reality is that it is. 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 the fastener comes off during operation, there is a risk that the stabilizer will fall, resulting in a major disaster. Against 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 U-shaped counterbored part and a round hole in the first object to be fastened, and a receptacle with a female thread formed in the second object to be fastened, and a receptacle in which a female thread is formed on one end surface. A stud having a male screw portion and a hexagonal head on the other end face, and a groove portion perpendicular to the axial direction formed in a part of the head is attached to the first cover. The receptacle is inserted into the round hole of the fastener and is attached by engaging the male threaded part with the female threaded part of the receptacle, and is further provided with a circular saw-shaped hole and whose outer periphery is formed to fit into the counterbore part. A flat retainer is attached to the head of the stud by inserting it into the circular saw-shaped hole, and is made of a material with spring properties and is bent in an L-shape. A snap having a notch is fitted into the groove of the stud so that the notch fits.

[Effect]

In this invention, the rotation of the stud is restricted by a retainer inserted into the hexagonal head, and the retainer is further restricted from rotating by a U-shaped counterbore provided on the first fastened object. It is restricted and held down by a snap to prevent it from coming off in the axial direction, making it possible to realize a reliable mechanism for preventing loosening.

〔Example〕

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, and FIGS.
1A and 1B, respectively, FIG. 2 shows a stud, FIG. 3 shows a retainer, and FIG. 4 shows a snap.

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);
Reference numeral 6 denotes a stud having a male threaded portion 5 formed at its tip and a hexagonal head 10 at its other end. The stud 6 is inserted into the round hole 12 provided in the U-shaped counterbore part 11 of the main body 1, and the female thread part 7 and the male thread part 5 of the receptacle 8 attached to the stabilizer 3 are engaged. ing. A retainer 13 has a saw-shaped hole 14 that fits into the hexagonal head 10 of the stud 6, and its outer periphery is shaped to fit with the U-shaped counterbore 11. 15 is a snap,
A material with spring properties (e.g. beryllium copper) is
It is curved into a letter shape and has a gentle bulge16.
It has a notch 17 with a hole. A groove 18 is provided in the head 10 of the stud 6, and the snap 15 is fitted into the groove 18.

Next, the loosening prevention function of the fastener mechanism according to the invention having the above-described structure will be explained.

The male threaded portion 5 of the stud 6 is engaged with the female threaded portion 7 of the receptacle 8, and it is clear that loosening can be prevented by taking measures to prevent rotation. The retainer 13 is for preventing the stud 6 from rotating, and since the circular saw-shaped hole 14 is inserted into the hexagonal head 10 of the stud 6, the retainer 13 is configured to rotate together with the stud 6. -ing Furthermore, the retainer 13 is
Since the rotation is restricted by the U-shaped counterbore portion 11 provided in the stud 6, the stud 6 does not rotate relative to the main body 1. The snap 15 is for holding down the retainer 13 so that it does not come off in the axial direction of the stud 6 (direction D in the figure).

The most important point here is that in the fastener mechanism according to this invention as described above, loosening of the stud 6 is prevented solely by the action of the retainer 13. In other words, the loosening prevention function is provided by the male threaded portion 5 of the stud 6 and the receptacle 8.
Since the fastener mechanism does not rely on frictional resistance with the female threaded portion 7, it is possible to provide a fastener mechanism with excellent durability. 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 advantage that by using a retainer and a snap, a fastener mechanism with a simple structure, reliable and durable anti-loosening function can be realized.

[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, and FIGS.
A diagram showing details of some parts in Figures a and 1b, Figure 5 is a diagram showing the appearance of a conventional towing vessel,
FIG. 6 is a partially detailed view of FIG. 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 head, 11 is a counterbore part,
12 is a round hole, 13 is a retainer, 14 is a saw-shaped hole, 15 is a snap, 16 is a gentle swell, 1
7 is a notch, and 18 is a groove. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A first object to be fastened, which has a U-shaped counterbore and a round hole is provided in the U-shaped counterbore, and a second object to which a receptacle having a female thread is attached. The second object to be fastened has a male thread on one end surface, a hexagonal head on the other end, and a part of the head has a structure perpendicular to the axial direction. a stud, the stud being inserted into the round hole and having the male threaded portion engaged with the female threaded portion;
a flat retainer having a circular saw-shaped hole, the circular saw-shaped hole being inserted into the head and the outer periphery of the retainer fitting into the U-shaped counterbore; and a spring. It is made by bending a flexible material into an L-shape, and has a gently swollen notch, and the notch is configured with a snap that is fitted into the groove. Fastener mechanism.