Ammunition and explosive-charge making – Loading fireworks and bursting charges – Placing bursting charge in projectile
Patent
1981-03-31
1983-05-17
Lechert, Jr., Stephen J.
Ammunition and explosive-charge making
Loading fireworks and bursting charges
Placing bursting charge in projectile
86 1R, 86 23, 102487, C06D 108
Patent
active
043834701
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for producing a tubular delay charge carrier for a hand grenade fuze, said carrier being open on both sides, a detonating charge being only ignited if a delay charge is contained in said tubular delay charge carrier.
2. Description of the Prior Art
In order to eliminate any danger to the thrower, the delay charge in the delay charge carrier effects a delayed detonation, when the hand grenade has already been projected, the safety lever being thrown off and the primer is struck during projection. After the burning of the delay charge, a flash of flame exits from the open carrier end and initiates the detonating charge (e.g. in accordance with the U.S. Pat. No. 2,562,928). It may happen in mass production, in particular, that the delay charge carrier has not or insufficiently been filled with the delay charge. The flash of flame emitted from the primer immediately hits the detonating charge in the first case so that the hand grenade detonates immediately, when being projected. The delay charge detonates in the second case but the delay is too short and the hand grenade detonates, when still flying.
In order to obviate the immediate detonation of a hand grenade, i.e. when a delay charge is not provided, the AT-PS No. 335.314 provides a safety disk sealing the delay charge carrier towards the detonating charge, said disk being dimensioned in such a manner that it melts only if the lowest part of the delay charge is ignited. It does not melt, however, when no delay charge has been provided, and the flash of flame from the primer hits the safety disk. Hence, the ignition of the detonating charge depends on the characteristics of the disk material, when a detonating charge has been provided. There remains, however, the problem of the incompletely filled delay charge carrier in which the amount of delay charge is insufficient, and consequently the delay time is too short.
SUMMARY OF THE INVENTION
It is, therefore, the object of the present invention to provide a method for producing a faultless tubular delay charge carrier in which the ignition of the detonating charge is not directly initiated by the ignition flash of the primer but exclusively by the delay charge. This depends on the charge but also on the correct filling height of the delay charge.
In accordance with the present invention, this is achieved by filling the delay charge into a tubular delay charge carrier closed on one side and by subsequently measuring the filling height, whereupon the bottom part of the delay charge carrier is perforated but only when the filling height of the delay charge is sufficient.
The method in accordance with the present invention does, therefore, not provide a safety member, as described in the beginning in order to make a possible lack of the delay charge ineffective, but the operating cycle following immediately to the filling process, i.e. perforating the bottom part of the delay charge carrier, is dependent on the presence of the delay charge. It is a particularly advantageous and important effect of the present invention that the bottom part will not be perforated if the delay charge does not reach the set filling height. As the delay charge generally comprises a number of layers, the lack of a layer as well as an insufficient compression of the layers will be recognized. The deficiently filled delay charge carriers can be immediately excluded from the operating cycle. They can, however, remain in the operating cycle, when delay charge carriers have been employed comprising a bottom part which is not melted by the flash of flame resp. gas jet of the delay charge. Even when a partially filled delay charge carrier is completed to a hand grenade fuze and inserted into a hand grenade, the hand grenade will not detonate while being projected.
A preferred embodiment provides that after filling the delay charge into the tubular delay charge carrier, a control piston is inserted into said tubular carrier until reaching the d
REFERENCES:
patent: 3952628 (1976-04-01), Boswell
patent: 4127054 (1978-11-01), Gully
Lechert Jr. Stephen J.
Oregon Etablissement fur Patentverwerting
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