JPH0530557Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a rotation activation mechanism for rotating a release shaft of a release mechanism in one direction in a release mechanism of a sonobuoy.

[Conventional technology]

Conventionally, various types of rotation activation mechanisms of this type have been implemented, and for example, one is used in a three-stage sensor suspension length switching device that switches the sensor suspension length by rotating a shaft. .

Fig. 2 is a perspective view showing the external configuration of the first conventional device, Fig. 3 is a front view of the device, Fig. 4 is a plan view of the device seen from above, and Fig. 5 shows the operation of the device. It is an explanatory diagram.

In the drawing, reference numeral 1 denotes a fixed board bent into an L-shape, and a shaft 3 is rotatably suspended from the bent portion 1a of the board 1, and a switch lever (not shown) is moved to adjust the hanging length of the sensor. It is now possible to switch.

The shaft 3 includes a first coil spring 4L that biases clockwise rotation and a second coil spring 4L that biases counterclockwise rotation.
R are wound vertically in line, and one end of each is locked.

A first bar spring 6L that biases the support at the other end of the first coil spring 4L and a second bar spring 6R that biases the support at the other end of the second coil spring 4R are attached to the bent portion 1a of the board 1. They are locked and extend upward in parallel.

A pair of pins 9a, 9b on which a first thread 8L, which holds the bias of the first bar spring 6L, protrudes from the front and back surfaces of the substrate 1.
The second rod spring 6 is wound around the left side of the substrate 1 through the
The second thread 8R that holds the bias of R is connected to the pins 9a and 9.
It is wound around the right side of the substrate 1 via the wire 1.b.

11L and 11R are a first resistor and a second resistor that generate heat, and the substrate 1 is in contact with the threads 8L and 8R.
It is attached to the upper part of the rod, and when an electric signal is received, it generates heat, melts the threads 8L and 8R, and releases the biasing force of the bar springs 6L and 6R.

Further, 12 is a terminal which rotates together with the shaft 3 and forms a circuit that sends a signal to end the operation when it comes into contact with an aluminum plate 13 attached to the substrate 1.

Next, the operation of this device will be explained.

2, 3 and 4 show the state before operation. In this state, when a current is applied to the second resistor 11R in order to change the hanging length of the sensor, the second thread 8R is fused due to the heat generated by the second resistor 11R, as shown in FIG. Therefore, the second bar spring 6R loses its support from the second thread 8R and expands laterally due to the biasing force. As a result, the other end of the second coil spring 4R becomes free, so the shaft 3 receives only the biasing force of the first coil spring 4L and rotates clockwise (rightward) when viewed from above.

At this time, even after the shaft 3 hits the stopper and stops at a predetermined rotation angle position, the coil spring 4
Since the urging force by L acts, the rotation angle is maintained.

At the same time, the terminal 12 contacts the aluminum plate 13 and conducts electricity, sending a signal indicating the end of rotation, and based on this signal, the current flowing through the right resistor 11R is cut off.

FIG. 6 shows a second conventional example.

The second conventional example has almost the same configuration as the first conventional example, but to explain the different parts, when current is passed through the tips of the first and second bar springs 6L and 6R, the resistors themselves fuse, such as fuses. The first and second resistors 14L and 14R are connected, and these resistors 14
Lead wires 15L and 15R of L and 14R are secured to conductive plates 16L and 16R attached to the substrate 1.

Regarding the operation of the second conventional example, for example, when a current is passed through the second resistor 14R, the resistor itself burns out.
The second rod spring 6R expands laterally. Since the subsequent process is the same as that of the first conventional example, the explanation thereof will be omitted.

[Problem that the invention attempts to solve]

However, the release shaft in the release mechanism of a sonobuoy only needs to rotate in one direction, and as in the device with the above configuration, the shape for rotating in two directions is complicated, and it is necessary to simply fix one of the shafts and only rotate in one direction. Even if it were rotated, there were problems in that the number of parts increased and reliability was lacking.

Therefore, this invention was devised by focusing on the above-mentioned problems, and its purpose is to reduce the number of parts, reduce costs, and provide a rotation starting mechanism with improved reliability. It is in.

[Means for solving problems]

In order to achieve this object, the present invention includes a release shaft of a release mechanism, and a rotation activation mechanism that starts rotation of the release shaft in one direction by energizing the release shaft. The coil spring includes a lever portion provided therein, a coil spring that urges the release shaft to rotate in one direction, a fusing member that melts when energized, and a lead wire that supplies current from a power source to the fusing member. and a stopper that locks the lever portion so as to prevent rotation of the release shaft.

[Effect]

In the present invention having such a configuration, when the fuser member is energized from the power source through the lead wire of the stopper, the fuser member fuses.

As a result, the lever portion of the release shaft is released from the stopper, so the release shaft rotates in one direction due to the biasing force of the coil spring, and the rotational force is transmitted to the release mechanism.

Therefore, the above-mentioned problem is eliminated.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

FIG. 1 is a perspective view showing a rotation starting mechanism according to an embodiment.

In the figure, reference numeral 18 denotes a base of a release mechanism, and a release shaft 19 is rotatably provided on a bent portion 18a of this base 18.

An enlarged diameter portion 20 is formed in the release shaft 19, and the enlarged diameter portion 20 and the bent portion 18a of the base 18
A coil spring 21 that urges the release shaft 19 to rotate in one direction is provided between the release shaft 19 and the coil spring 21. The upper end of the coil spring 21 is engaged with the enlarged diameter portion 20, and the lower end is engaged with the bent portion 18a of the base 18. has been done.

In addition, a lever portion 2 having a protruding shape is provided on one side of the enlarged diameter portion 20.
2 is provided.

A board 23 is fixed to the base 18 with screws 24,
A solid resistor 25 as a fusing member is attached to this board 23.
A stopper consisting of a lead wire 26 is fixed in a U-shaped bent state, and is connected to a seawater battery as a power source.

The lever portion 22 of the release shaft 19 is engaged with the U-shaped solid resistor 25 and the lead wire 26, and rotation by the biasing force of the coil spring 21 is prevented.

The solid resistor 25 is molded by mixing carbon powder with synthetic resin, and is designed to be fused by the heat generated by energization, thereby releasing the rotation prevention of the release shaft 19.

Next, the operation of the rotation starting mechanism having the above configuration will be explained.

When the sonobuoy lands on the sea surface and the seawater battery is activated, current flows through the connected solid resistor 25, causing the solid resistor 25 to generate heat and melt down.

As a result, the coil spring 21 is no longer able to support the rotational force of the release shaft 19, the release shaft 19 rotates in one direction, and the rotational force is transmitted to the release mechanism.

[Effect of idea]

As is clear from the above description, according to this invention, a coil spring is provided that urges the release shaft to rotate in one direction, and the stopper is used as a stopper that prevents rotation of the release shaft that is urged by the coil spring. Since the structure includes a resistor that melts when current flows, the structure can be simplified, the number of parts can be reduced, and reliability and workability can be improved.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the rotation starting mechanism according to this embodiment, Fig. 2 is a perspective view showing the device of the first conventional example, Fig. 3 is a perspective view showing the device of the first conventional example, and Fig. 4 5 is an explanatory view showing the operation of the device of the first conventional example, and FIG. 6 is a front view of the device of the second conventional example. 18...Base, 19...Release shaft, 20
... Expanded diameter part, 21 ... Coil spring, 22 ...
... Lever part, 23 ... Board, 25 ... Solid resistor, 26 ... Lead wire.

Claims (1)

[Claims for Utility Model Registration] (1) In a rotation starting mechanism that includes a release shaft of a release mechanism and starts the release shaft to rotate in one direction by energizing, the rotation starting mechanism projects from the release shaft in the radial direction thereof. It consists of a provided lever part, a coil spring that urges the release shaft to rotate in one direction, a fusing member that melts when energized, and a lead wire that supplies current from a power source to the fusing member,
A rotation activation mechanism comprising: a stopper that locks the lever portion so as to prevent rotation of the release shaft by the coil spring. (2) The rotation starting mechanism according to claim 1, which is characterized in that a solid resistor is used as the fusing member.