JPS6229836Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety mechanism for a fuze that does not have a driving force before firing.

Conventionally, various safety mechanisms have been proposed for fuzes, but one widely known mechanism involves winding up a mainspring as a driving spring in advance and incorporating it into the fuse, and using the acceleration during firing to cause the mainspring to move. There is one that operates a safety device by removing the stopper and using the force of the mainspring's unwinding as driving force. However, since the pre-wound mainspring has driving energy, there is a risk that it will malfunction before firing.

In addition, there are some that operate a safety device by the centrifugal force generated by the rotation of the bullet during flight. However, this cannot be used for non-traveling bullets that do not generate centrifugal force.

In addition, other mechanisms that operate safety devices using the acceleration generated by the propulsion of the combustion motor of rockets etc. have the disadvantage that they cannot be used with ammunition types such as rockets whose motor combustion time is extremely short. .

The present invention was devised in view of the above circumstances, and its purpose is to provide a safety mechanism for a fuze that has a simple structure, can be used for non-rotating bullets, and does not have a driving force before firing. It's about doing. Therefore, the gist of the present invention is a weight holder having a rack provided in the axial direction of a part of the outer surface of a cylinder, a rotor that engages with the rack and has a built-in detonator, and a A wheel train that controls rotation, and a weight that is movably disposed within the weight holder and is pushed up by the drag force of a drive spring, and is fixed to the weight holder by retreating against the drag force due to setback or propulsion force. and a fixed spacer that guides the weight holder, limits movement of the weight, and accommodates the compressed drive spring.

Embodiments of the present invention will be further described below with reference to the drawings.

FIG. 1 is a sectional view of the safety mechanism of the fuse, and shows the state before the safety is released. In the figure, code 1 is a weight holder;
2 is a weight, 3 is a drive spring, and 4 is a fixed spacer. The weight holder 1 is made of a cylindrical body having an inward flange 5 at one end (upper side in the figure), and has an axial rack 6 formed on a part of its outer surface. A circular rotor gear 7 is engaged with this rack 6. A rotor 8 is integrally formed with the rotor gear 7, and the rotor 8 has an explosive tube 9 built therein.
Furthermore, a rotor rack 11 having arc-shaped inward teeth 10 is provided inside the rotor gear 7.
The rotor rack 11 is a wheel train 12 which is an escapement mechanism.
The rotation of the rotor 8 is controlled by meshing with the rotor 8.

The weight 2 is inserted so as to be movable in the vertical direction as shown in the figure inside the weight holder 1 that stands on its feet.
The tip of the safety line 13 is inserted from the side surface of the weight 2 in a state where it is located at the upper end of the weight 2 to prevent the weight 2 from descending and maintain the state before the safety is released. In addition, if you want to cancel this safety, either pull out the safety line 13 manually or
Alternatively, it can be pulled out by sending an electrical signal from the outside using a solenoid or the like. After the safety line 13 is pulled out, the weight 2 does not descend because it is supported by the drag force of the drive spring 3, but the setback (backward force) of the launch or the propulsive force of the rocket motor is applied to the projectile. and is pushed downward, causing what is called a retreat. Furthermore, on the side of the weight, there is a second
As shown in the operating state diagram in the figure, holes 14 facing the central axis are provided at two symmetrical locations to lock the lock spring 15.
and click ball 16 is inserted. This click ball 16 is attached to a weight 2 as described later.
In order to fix it to the weight holder 1 when it descends,
It is designed to fit into a click hole 17 made in the inner wall of the weight holder 1.

The drive spring 3 is, for example, a coil spring interposed between the lower end surface of the weight holder 1 and the lower surface of the weight 2, and pushes the weight 2 upwards in the weight holder 1 before firing. A fixed spacer 4 is fixed to a fixed member (not shown) around the lower end of the drive spring 3. This fixed spacer 4 has a cylindrical shape and is installed inside the weight holder 1 to guide the weight holder 1 and limit the movement of the weight 2 when it descends, as well as to control the compressed drive force at that time. The spring 3 is housed in the central space 18.

The operation of the fuse safety mechanism having the above configuration will be explained next. Immediately before firing the bullet, the safety line 13 is pulled out using any of the means described above to unlock the weight 2. In this state, as shown in FIG. 2, the weight 2 is at the upper end of the weight holder 1, and the detonator tube 9 in FIG. 1 is in an inclined state. Further, as shown in FIG.
It's within 4. Therefore, when the projectile is launched, the weight 2 is pushed downward against the drag force of the drive spring 3 due to the setback of the launch or the propulsive force of the rocket motor. When the weight 2 descends to the upper end of the spacer 4, the drive spring 3 is compressed and fits into the central space 18 of the spacer 4, as shown in FIG.
The click ball 16 is pushed by the lock spring 15 and fitted into the click hole 17, and the weight 2 is fixed to the weight holder 1 there. Since the weight 2 is fixed to the weight holder 1, the weight holder 1 and the weight 2 are guided by the outer peripheral surface of the spacer 4 due to the drag force of the compressed drive spring 3, as shown in FIG. to move upward. As the weight holder 1 moves, the rotor gear 7 meshing with the rack 6 on the outer surface rotates clockwise in the figure, as shown in FIG. 5, and at the same time the rotor 8 integrated therewith also rotates. At this time, the rotor lock 11, which is also integrated with the rotor gear 7, is meshed with the wheel train 12, so the rotor 8
rotation is controlled. Therefore, when the rotor 8 finishes rotating after a certain period of time, the detonator 9 stands upright, the gunpowder series is aligned, and the safety of the fuse is released.

As explained above, according to the present invention, there is no driving energy before the bullet is fired, so safety before firing is ensured. In addition, the structure is simple,
It has the advantage that it can be used as a safety mechanism for artillery shells and rocket shells with a short burn time, regardless of whether they are non-travel bullets or orbiting bullets.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the fuze safety mechanism showing an embodiment of the present invention in operation before the safety is released, Fig. 2 is a partial sectional view before its operation, and Fig. 3 is a partial sectional view during its operation. FIG. 4 is a partial cross-sectional view after the operation, and FIG. 5 is a cross-sectional view after the safety is released. 1... Weight holder, 2... Weight, 3... Drive spring, 4... Fixed spacer, 6... Rack, 7...
Rotor gear, 9... detonator, 11... rotor rack.

Claims (1)

[Scope of utility model registration request] A weight holder with a rack provided in the axial direction of a part of the outer surface of the cylinder, a rotor that engages with the rack and has a built-in detonator, a gear train that controls the rotation of the rotor, and the weight holder. A weight that is movably disposed within the weight holder and is pushed up by the drag force of the drive spring, and is fixed to the weight holder by retreating against the drag force due to setback or propulsion force, and a weight that guides the weight holder and A safety mechanism for a fuze comprising a fixed spacer that limits movement of a weight and accommodates the compressed drive spring.