GB2387219A

GB2387219A - A grenade

Info

Publication number: GB2387219A
Application number: GB0223868A
Authority: GB
Inventors: William James Sharplin
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-10-18
Filing date: 2002-10-14
Publication date: 2003-10-08
Anticipated expiration: 2022-10-14
Also published as: GB2387219B; NZ514921A; US20030127012A1; GB0223868D0

Abstract

There is provided a grenade, having a case 1, a sabot 2, and a cover 3. The sabot has a base part 12, a space for receiving a projectile or projectiles 18, and a plurality of petals(14). The grenade is formed such that when it is arranged for use the sabot 2 is fitted to the case 1, the projectile or projectiles 18 are within the space, and the cover 3 is fitted around the petals wherein end parts of the petals bend towards one another to substantially encapsulate the projectile or projectiles 18. When it is fired from a suitable rifle a charge 5 in the case causes the sabot 2 and the projectile or projectiles 18 to be propelled forward and punch through the cover 3 such that the projectile or projectiles 18 are released from the sabot 2 to a target.

Description

:- i i 1 2387219

TITLE A Grenade FIELD OF INVENTION

5 This invention relates to a grenade. In particular, a preferred form of the invention relations to a grenade capable of being fired from a suitable rifle.

BACKGROUND

In the context of military operations it is desirable to have a grenade which can be 10 fired with a rifle to deliver a pay load of metallic pellets or similar projectiles to a target. Grenades which release pellets at a high velocity in a dispersed fashion are particularly useful for close quarters combat, especially in a jungle situation. It is accordingly an object of at least one form of the present invention to provide a grenade which can be fired to deliver pellets or other projectiles to a target, or to at least provide the public with a useful choice.

SUMMARY OF THE INVENTION

According to one aspect of the invention there is provided a grenade, having a case, a sabot, and a cover; the sabot having a base part, a space for receiving a projectile or projectiles, 20 and a plurality of petals; the grenade being formed such that when it is arranged for use the sabot is fitted to the case, the projectile or projectiles are within the space, and the cover is fitted around the petals wherein end parts of the petals bend towards one another to substantially encapsulate the projectile or projectiles; 25 the grenade being formed such that when it is in use and is fired from a suitable rifle a charge in the case causes the sabot and the projectile or projectiles to

be propelled forward and punch through the cover such that the projectile or projectiles are released from the sabot to a target.

Preferably the petals are arranged such that they fan outwards to release the 5 projectile or projectiles when the grenade has been fired and the sabot leaves the rifle. Preferably the sabot is arranged such that it will spin within a barrel of the rifle when the grenade has been fired, the spin causing the petals to fan outwards when they 10 contact air outside the barrel.

Preferably the sabot has a resilient packing for receiving the projectile or projectiles.

The packing may be a pad formed from a suitable micro-cellular material.

Preferably the cover is substantially conical and has an open end and a closed end, the open end engaging the case, and the closed end defining an extremity (eg nose) of the grenade, when the grenade is in a ready for use arrangement.

Preferably the cover has a plurality of lines of weakness to assist the sabot and the projectile or projectiles to punch through the cover when the grenade is fired with the 20 rifle. The lines of weakness may be in the form of fractures and/or grooves in the cover. Preferably the cover and the case are fitted to one another by way of screw threads when the grenade is in a ready for use arrangement.

Preferably the case is arranged with an internal space adapted to act as at least part

v of a low pressure chamber, the low pressure chamber being defined in part by a wall and a floor, the wall and the floor being part of the case, the wall tapering in towards the floor and arranged such that the base part of the sabot can butt against the wall such that the floor and the base part of the sabot are spaced from one another.

5 Preferably the wall merges into the floor in a substantially curved fashion.

Preferably the base part of the sabot has an obturating edge where it butts against the wall when the grenade is in a ready for use arrangement. This obturating edge facilitates a sealing contact between the sabot and the wall.

Preferably the case has a high pressure chamber which, when the grenade is in a ready for use arrangement, houses a charge (eg suitable cellulosic explosive material). When the grenade is ready for use the high pressure chamber may be substantially closed by a plug inserted into the rest of the case, the plug containing the charge. The plug which itself forms part of the case and the high pressure chamber, may be screw fitted to the rest of the case. ^ Preferably there is a passage or passages between the high pressure chamber and the low pressure chamber.

20 Preferably a sheet member, eg a thin disk, is within the high pressure chamber and covers the passage or passages when the grenade is in a. ready for use arrangement. Preferably the plug has a primer for igniting the charge.

According to another aspect of the invention there is provided a grenade for firing

from a suitable rifle, the grenade having a case and a sabot, the sabot having an obturating edge for contacting the case to form a substantially water tight seal between the case and the sabot.

5 According to a further aspect of the invention there is provided a grenade for firing from a suitable rifle, the grenade having a case and a sabot, the case having a high pressure chamber for receiving a charge, the high pressure chamber being substantially closed by a plug, the plug itself being part of the case, the plug having a primer and engaging the rest of the case by way of a screw thread arrangement.

According to another aspect of the invention there is provided a grenade adapted to be fired from a suitable rifle, the grenade incorporating a case, a sabot, a plurality of projectiles, and a cover, the sabot having a plurality of flexible petals which substantially encapsulate the projectiles while the cover substantially encapsulates the petals and holds the petals against the projectiles.

Some preferred aspects and embodiments of the invention will now be described by way of example, and/or with reference to the accompanying drawings, of which: BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is an external side view of a rifle grenade, Figure 2 is an overhead view of the grenade, Figure 3 is an underneath view of the grenade, Figure 4 is cross sectional view of the grenade taken through the line AA as represented in figure 3, 25 Figure 5 is a three dimensional crosssectional view of the grenade taken through the line A-A,

Figure 6 is a three dimensional view of a sabot forming part of the grenade, and Figure 7 is a three dimensional view of the sabot as it would appear when the grenade is in a ready to use arrangement.

DETAILED DESCRIPTION

Referring to figures 1 to 5, the grenade has a case 1, a sabot 2, and a cover or nose cone 3. The case 1 and the nose cone 3 are adapted to engage one another by way of a screw thread arrangement wherein the nose cone 3 screws into the case 1.

10 The case 1 has a cup like plug 4 which can be screwed into place by way of a screw thread arrangement to define a high pressure chamber 5 within the case 1. The high pressure chamber 5 is adapted to hold a charge of a suitable cellulosic explosive material or similar. As shown, the plug 4 has a primer 6 for igniting the cellulosic explosive material when the grenade is fired from a rifle.

With reference to figures 4 and 5, the plug 4 fits up against a 0.5 mm copper disc 7, the disk 7 covering passages 8 extending away from the high pressure chamber 5.

As shown, the passages 8 extend to a low pressure chamber 9 defined within an internal space of the case 1. More specifically, the low pressure chamber 9 is defined by or between a wall 10 and a floor 11 of the case, and the base 12 of the 20 sabot 2. The base 12 of the sabot has an obturating edge 13 which forms a gas tight seal between the sabot 2 and the case 1.

Referring to figure 6, the sabot 2 has a plurality of wad petals 14 extending upwards.

Each of the petals are separated by slits 15 so that they can move independently of 25 one another. As shown, each petal has a fixed end 16 and a free end 17. Figure 6 shows the sabot 2 prior to it assuming a ready for use orientation. The ready for use

orientation of the sabot 2 is shown at figures 4, 5 and 7, where a plurality of projectiles or pellets 18 are packed between the petals on a resilient foam packing or pad 19. As shown, when ready for use the petals 14 overlap one another to assume a substantially conical shape, and are held in that orientation by way of the 5 nose cone 3. More specifically, the petals 14 bend inwards under pressure from the nose cone 3, and substantially encapsulate the pellets. The petals may not completely enclose the pellets as the apex of the conical shape may remain slightly open. However, even in this situation, and for the purposes of this document, the petals should be interpreted as substantially encapsulating the pellets. The nose 10 cone 3 thus enshrouds both the petals 2 and the pellets 18 to maintain the petals in the desired orientation. The pellets are held tight and are substantially prevented from rattling within the sabot due to the pressure of the nose cone, and also due to the compressive effect of the resilient pad 19 on the pellets.

The nose cone 3 is formed with grooves, fracture lines, or other lines of weakness so that it can be readily ruptured when desired. The nose cone 3 may be formed from a suitable plastics material, for example a suitable polyethylene material. The sabot 2 is preferably formed from a suitable urethane material, and the case 1 is primarily formed from a suitable metallic substance.

20 When the grenade is in use it is loaded into a grenade firing rifle and fired. The charge in the high pressure chamber 5 detonates, blows through the copper disc 7, and sends gases through the passages 8 and into the low pressure chamber 9.

This causes the sabot 2, including the pellets 18, to blast through the nose cone 3 and move down the barrel of the rifle. The case 1 is left within the rifle. The sabot is 25 arranged such that as it moves down the barrel it is caused to spin. When the sabot 2 passes out of the end of the barrel, the force of the outside air on the spinning

sabot 2, and in particular on the petals 14, causes the petals 14 to open or flare outwards thus releasing the pellets 18 at high velocity. The pellets 18 proceed to a desired target, leaving the sabot 2 behind due to the slowing effect of the outside air on the flared petals 14.

The pellets 18 are preferably lead balls coated with copper, and when fired as above spray outwards making it difficult for a fleeing target to avoid them. In some embodiments of the invention the pellets 18 may be capable of blowing a door off its hinges. 10 7" When a grenade is fired as above it will be evident to those skilled in the art that there is a need to protect the barrel of the rifle from damage by the pellets 18. This protection is achieved by way of the petals 14, which only open to release the pellets 18 when the sabot has passed out of the end of the barrel. In the embodiment of the invention described above the case 1 is substantially 40 mm in diameter, although it should be understood that this is not a restriction on the scope of the invention. While some preferred aspects and embodiments of the invention have been described by way of example, it should be appreciated that modifications and 20 improvements can occur without departing from the scope of the appended claims.

Claims

CLAIMS:

1. A grenade, having a case, a sabot, and a cover; the sabot having a base part, a space for receiving a projectile or projectiles, 5 and a plurality of petals; the grenade being formed such that when it is arranged for use the sabot is fitted to the case, the projectile or projectiles are within the space, and the cover is fitted around the petals wherein end parts of the petals bend towards one another to substantially encapsulate the projectile or projectiles; 10 the grenade being formed such that when it is in use and is fired from a suitable rifle a charge in the case causes the sabot and the projectile or projectiles to be propelled forward and punch through the cover such that the projectile or projectiles are released from the sabot to a target.

2. A grenade according to claim 1, wherein the petals are arranged such that they fan outwards to release the projectile or projectiles when the grenade has been fired and the sabot leaves the rifle.

3. A grenade according to claim 1 or 2, wherein the sabot is arranged such that it will spin within a barrel of the rifle when the grenade has been fired, the spin causing 20 the petals to fan outwards when they contact air outside the barrel.

4. A grenade according to claim 1, 2 or 3, wherein the sabot has a resilient packing for receiving the projectile or projectiles.

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5. A grenade according to any one of the preceding claims, wherein the cover is substantially conical and has an open end and a closed end, the open end engaging

the case, and the closed end defining an extremity of the grenade, when the grenade is in a ready for use arrangement.

6. A grenade according to any one of the preceding claims, wherein the cover has a 5 plurality of lines of weakness to -assist the sabot and the projectile or projectiles to punch through the cover when the grenade is fired with the rifle.

7. A grenade according to any one of the preceding claims, wherein the cover and the case are fitted to one another by way of screw threads when the grenade is in a 10 ready for use arrangement.

8. A grenade according to any one of the preceding claims, wherein the case is arranged with an internal space adapted to act as at least part of a low pressure chamber, the low pressure chamber being defined in part by a wall and a floor, the wall and the floor being part of the case, the wall tapering in towards the floor and arranged such that the base part of the sabot butts against the wall such that the floor and the base part of the sabot are spaced from one another.

9. A grenade according to claim 8, wherein the wall merges into the floor in a substantially curved fashion.

10. A grenade according to claim 8 or 9, wherein the base part of the sabot has an obturating edge where it butts against the wall when the grenade is in a ready for use arrangement.

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11. A grenade according to any one of the preceding claims, wherein the case has a high pressure chamber which, when the grenade is in a ready for use

arrangement, houses the charge.

12. A grenade according to any one of the preceding claims, wherein when the grenade is ready for use the high pressure chamber is substantially closed by a plug 5 inserted into the rest of the case.

13. A grenade according to claim 12, wherein the plug is screw fitted to the rest of the case.

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14. A grenade according to claim 11, 12 or 13, in each case when read back on at least claim 8, wherein there is a passage or passages between the high pressure chamber and the low pressure chamber.

15. A grenade according to claim 14, wherein there is a sheet member within the high pressure chamber which is against the passage or passages when the grenade is in a ready for use arrangement.

16. A grenade according to claim 12 or 13, in each case when read back on claim 11, wherein the plug has a primer for igniting the charge.

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17. A grenade substantially as herein described with reference to the accompanying drawings.