Ammunition and explosives – Shells – Grenade
Patent
1997-11-05
1999-08-31
Tudor, Harold J.
Ammunition and explosives
Shells
Grenade
102372, 42105, 89 1818, F42B 1500
Patent
active
059456280
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a sealing means for a grenade of a shell thrower, where the grenade is inserted in the barrel and a booster charge under the grenade is fired to generate a gas pressure, which drives the grenade out of the barrel.
An object of the present invention is to improve the power of the booster charge on the grenade so that there is a possibility to arrange a sealing between the grenade or a part of the grenade and the bore of the barrel. It is thereby possible to use most of the gas pressure of the fired booster charge for ejecting the grenade.
The invention will be described in the following by reference to the enclosed drawings.
FIG. 1 shows a longitudinal section of the lower part of the grenade and its pressure plate.
FIG. 2 is a longitudinal schematic section of the pressure plate and a part of the surrounding barrel and shows the function of the pressure plate as a valve when the grenade is fired. The left side of FIG. 1 shows the form of the valve when the pressure plate is inserted in the barrel.
FIG. 3 is a plan view of the valve element in the firing position but in a smaller scale than in FIG. 2.
FIG. 4 is a view of the form of the valve element in its rest position and in a smaller scale than in FIG. 2.
FIG. 1 shows the lower part 2 of a grenade schematically. A pressure plate 1 is detachably fixed on the bottom of the grenade and the pressure plate includes a booster charge 3. The booster charge is placed on the underside of the pressure plate. An ignition mechanism 4 for the booster charge is arranged on the underside of the pressure plate and could be a common blasting cap, which is initiated by an impact. The ignition mechanism or the blasting cap 4 is initiated when the pressure plate is inserted together with the grenade 2 in the barrel and hits the bottom of the barrel or a stop pin in the barrel.
A releasable engagement 5 connects the pressure plate 1 with the underside 6 of the grenade 2. This releasable engagement 5 consists of a sleeve 7 which is fixed to the upper side of the pressure plate. A pin 8 is inserted from above in the sleeve, which pin, for instance, is threaded into the bottom 6 of the grenade 2. A locking pin 9 is inserted in a bore 10, which is extended through the sleeve 7 and into the pin 8. The bottom 11 of the bore 10 is connected with a channel 12, which is extended through the pressure plate to the bottom of the sleeve 7.
The operation of the pressure plate is as follows. When the booster charge is initiated by the ignition mechanism 4 and thus is fired, a gas pressure is generated, the main object of which is to eject the pressure plate together with the grenade out of the barrel. A part of the driving pressure of the booster charge will however be conducted by the channel 12 to the bottom 11 of the bore 10 in the pin 8. The locking pin 9 will hereby be driven out of the bore 10 and the pressure plate is released from the grenade. Because the pressure plate is smaller and lighter than the grenade, the pressure plate, after having left the barrel together with the grenade, will fall down to the ground just outside the barrel whereas the grenade 2 will proceed from the shell thrower in a certain path.
FIGS. 2-4 shows the pressure plate operating as a sealing valve 13.
The pressure plate (the sealing valve) includes a valve element 29, which is located in a groove 25 in the envelope surface of the pressure plate 1. The groove 25 is beveled from its upper edge 27 so that the upper inner side of the edge forms an angle .alpha. with the diametrical plane 26. The valve element 29 mounted in the groove 25 has a beveled upper side 30 corresponding to the slope of the side 27 of the groove. The valve element 29 is spring expanding which means that when there is a pressure from underneath, see arrow 14, it will be forced upwards and outwards out of the groove and thereby against the inside of the barrel 23, which causes a seal so that the gas pressure cannot pass between the pressure plate 1 and the inside of the barrel 23.
The valve element is th
REFERENCES:
patent: 1044360 (1912-11-01), DuBois
patent: 1311006 (1919-07-01), Post
patent: 3915091 (1975-10-01), Smith et al.
patent: 4611540 (1986-09-01), Pettersson et al.
patent: 5175393 (1992-12-01), Andersson
Roheim System
Tudor Harold J.
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