DESC:Technical Field of Invention
The present invention relates to a simulated hand grenade and its method.
Background of the Invention
Grenade simulators are useful for soldiers to develop a high degree of mind-body coordination for handling and practicing lobbing techniques for effectively firing hand grenades thereby preventing accidents. Conventional grenade simulators and methods suffer from disadvantages as explained below.
The base plug of grenade simulator has bore for seating the pyrotech cartridge and threads for closing the base opening of grenade shell. Excessive tightening of the base plug will damage the pyrotech cartridge or cause positional disturbance of pyrotech cartridge which decreases the hit probability of striking pin to accurately hit on to the centre point of the pyrotech cartridge for firing of grenade simulator to produce blast, flash, smoke and sound, thereby resulting in non-functional of grenade simulator.
The striker pin of grenade simulator has a striking needle with a sharp point to strike the pyrotech cartridge so as to explode after set delay time. After certain usage of grenade simulator, the sharp point of the striking needle is getting blunt or damaged which decreasing the life of striking needle and also decreasing the hit probability of striking pin to accurately hit on to the centre point of the pyrotech cartridge for firing of grenade simulator to produce blast, flash, smoke and sound, thereby resulting in non-functional of grenade simulator.
It is therefore desirable to have a grenade simulator and method that would overcome the shortcomings or at least substantially ameliorate the shortcomings and disadvantages of the conventional grenade simulators and methods.
Brief Summary of the Invention
It is an object of the present invention to provide a simulated hand grenade and its method.
According to the first aspect of the present invention, a base plug of a grenade simulator is provided with a collar to avoid a damage or positional disturbance of a pyrotech cartridge caused by excessive tightening of the base plug thereby increasing a hit probability of striking pin to accurately hit on to a centre point of the pyrotech cartridge for firing of the grenade simulator to produce a blast, flash, smoke and a sound, thereby resulting in proper functioning and increasing the life of the grenade simulator.
According to the first aspect of the present invention, three circular step shaped fume caps are accommodated by pyrotech cartridge to avoid the positional disturbance of the pyrotech cartridge caused by excessive tightening of the base plug thereby increasing the hit probability of striking pin to accurately hit on to the centre point of the pyrotech cartridge for firing of grenade simulator. The fume cap is provided with a plurality of holes on the wall for passage of fumes and smoke into the shell when the pyrotech cartridge explodes.
According to the first aspect of the present invention, striker pin is provided with a two stage angular conical shaped striking needle with a small diameter flat at the bottom to avoid the damage and to increase the life of striking needle thereby increasing the hit probability of striking pin to accurately hit on to the centre point of the pyrotech cartridge for firing of grenade simulator to produce the blast, flash, smoke and the sound.

Brief Description of Drawings:
FIG. 1.shows exploded view of grenade simulator
FIG. 2.shows cross sectional view of grenade simulator
FIG. 3.shows a front view of grenade simulator
Detailed Description of the Invention
It is to be understood that the present disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description. The present disclosure is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.

On the contrary, it is intended to cover alternatives, modifications and equivalents. Various modifications to the present invention will be readily apparent to a person skilled in the art, and can be made to the present invention within the spirit and scope of the invention.

According to the first aspect of the present invention, a base plug of a grenade simulator is provided with a collar to avoid a damage or a positional disturbance of a pyrotech cartridge caused by excessive tightening of the base plug thereby increasing the hit probability of a striking pin to accurately hit on to a centre point of the pyrotech cartridge for firing of grenade simulator to produce a blast, flash, smoke and a sound, thereby resulting in proper functioning and increasing the life of the grenade simulator.
According to the first aspect of the present invention, three circular step shaped fume cap is accommodated by pyrotech cartridge to avoid the positional disturbance of pyrotech cartridge caused by excessive tightening of the base plug thereby increasing the hit probability of the striking pin to accurately hit on to the centre point of the pyrotech cartridge for firing of grenade simulator. The fume cap is provided with a plurality of holes on the wall for passage of fumes and smoke into the shell when pyrotech cartridge explodes.
According to the first aspect of the present invention, the striker pin of the grenade simulator is provided with a two stage angular conical shaped striking needle with a small diameter flat at the bottom to avoid the damage and to increase the life of striking needle thereby increasing the hit probability of striking pin to accurately hit on to the centre point of the pyrotech cartridge for firing of grenade simulator to produce the blast, flash, smoke and the sound.

Figs. 1-3 illustrates exemplary embodiments of the present invention. In which, FIG. 1 shows the exploded view of a grenade simulator. A grenade shell (102) is machined from a mild steel rod of homogeneous and soft material to take impact load and to absorb shocks so that the grenade will never break and results in higher safety and reusability. An upper portion (204) of the shell (102) contains threads for fixing the guide tube as shown in FIG. 2, so that the guide tube (122) can be easily detached from the shell (102) and can be cleaned as and when required. Vent holes (108) are provided on a lateral surface of the shell (102) as shown in FIG. 1 for facilitating fumes and smoke to escape. For safety purpose, the vent holes size is maintained in the range of 6 to 7mm in diameter. A dummy opening (202) as shown in FIG. 2 is provided for fumes and smoke to escape and is maintained bigger than the vent holes (around 22mm diameter), The dummy opening also helps to reduce the stress caused, thus gives more safety. Grooves (110) are provided on the outer surface of the shell to replicate the original grenade in shape as shown in FIG. 1. Ribs (106) are made up of mild steel and welded to an upper portion (204) of the shell (102) as shown in FIG. 1. Ribs (106) consist of a plurality of slits (124) and a hole (126) as shown in FIG. 1. Slits (124) are used for seating the safety lever (304) which holds a striker pin (118). Safety lever (304) is made up of steel sheet. Holes (126) are used for inserting safety pins (306), thus the pins (306) does not allow safety lever (304) to come out as shown in FIG. 3.
An expansion chamber (206) as shown in FIG. 2 has an empty volume which is used to expand the fumes after explosion so as to decrease the stress on the shell (102). A guide tube (122) is machined from steel rod as shown in FIG. 1. The guide tube (122) mainly consists of a threaded portion (128), two bores (130), (132) and a slit (134). Threaded portion (128) is used to fit to the shell (102) so that guide tube (122) can be detached as and when required to clean. The slit (134) is used to tighten the guide tube. Upper bore (130) helps to guide the spring (120) and the striker pin (118). Lower bore (132) is used for seating a fume cap (116). A spring steel made striker spring (120) forces the striking pin (118) to hit on to the pyrotech cartridge (114) for firing.
A striker pin (118) made of steel consists of a slit (136) and a striking needle (138). The slit (136) is held by the safety lever (304). The striker pin (118) of the grenade simulator is provided with a two stage angular conical shaped striking needle (138) with a small diameter flat at the bottom as shown in FIG.4 increases the life and avoids the damage or the blunt of striking needle (138) thereby increasing the hit probability of striking pin (118) to accurately hit on to the centre point of the pyrotech cartridge (114) for firing of grenade simulator to produce the blast, flash, smoke and the sound.
The pyrotech cartridge (114) which is a plastic casing contains low quantity ammunition (2 to 4 grams), creates the blast, flash, smoke and the sound when it is actuated. The pyrotech cartridge (114) has a predetermined and set delay time to explode after the penetration in the range of 3.5 sec to 4 sec. A steel base plug (112) is used to close the base opening of the grenade shell (102). The base plug (112) having bore (144), threads (146) and collar (148) bore (144) is used for seating the pyrotech cartridge (114). Threads (146) are used for closing the base opening (302). Collar (148) is used as a mechanical stop.
The mild steel made circular step shaped fume cap (116) is accommodated by the upper portion (114a) of pyrotech cartridge (114) thereby avoids the positional disturbance of pyrotech cartridge (114) caused by excessive tightening of the base plug (112) thereby increasing the hit probability of striking pin to accurately hit on to the centre point of the pyrotech cartridge (114) for firing of grenade simulator. The lower portion (114b) of pyrotech cartridge (114) is seated into the bore (144) of the base plug (112) as shown in FIG.2. The fume cap (116) is provided with holes (140) on the wall for passage of fumes and smoke into the shell (102) when pyrotech cartridge (114) explodes. The fume cap (116) prevents the spring (120) from damage and also keeps the guide tube (122) clean without fume and plastic deposits of the burnt cartridge. The fume cap has a hole (142) which is used to guide the striker pin needle (138) to penetrate into the pyrotech cartridge (114).
The threads (146) of the base plug (112) are used for closing the base opening (302) and these threads are coarse threads which takes impact loads. The base plug (112) is provided with a collar (148) at the bottom there by avoiding the damage or positional disturbance of pyrotech cartridge (114) caused by excessive tightening. The base plug thereby increases the hit probability of striking pin (118) to accurately hit on to the centre point of the pyrotech cartridge (114) for firing of grenade simulator.
When the grenade is to be reloaded, the base plug (112) is detached from the shell (102) with help of the holes (208). Safety lever (304) holds the striking pin (118). The safety lever (304) is seated on the slits (124) provided on the ribs (106) of the shell (102). Safety lever (304) has a portion (150) which enters into the slit (136) of striker pin (118) for holding the safety pin (306) and a portion (152) which guides into the slits (124) of welded ribs (106). The safety pin (306) protects the safety lever (304) not to come out as shown in FIG. 3. If the safety pin (306) is pulled out, the safety lever (304) comes up and striker pin (118) hits the pyrotech cartridge (114).
Although the present invention has been described in terms of certain preferred embodiments and illustrations thereof, other embodiments and modifications may be possible that are within the principles and spirit of the invention. The above descriptions are therefore to be regarded as illustrative and not restrictive. ,CLAIMS:Claims:
I/We claim

1. A grenade simulator and a method, comprises of:
a shell;
a guide tube having a threaded portion, two plain bores and a slit;
a striker spring;
a striker pin having a slit and a striking needle having a two stage angular conical shape with a small diameter flat at the bottom;
a three circular step shaped fume cap provided with a plurality of holes on the wall,
a pyrotech cartridge having ammunition for creating fumes, smoke and blast noise when it is actuated,
a base plug for closing the base opening of said shell having a bore for seating said pyrotech cartridge, threads for closing the base opening, a collar to stop the excessive tightening and a hole for tightening the said base plug;
a safety lever for holding the said striking pin, said safety lever having two portions; and
a safety pin for protecting said safety lever not to come out from said ribs.

2. The grenade simulator and method as claimed in claim 1, wherein the said base plug is provided with a collar to avoid the damage or positional disturbance of pyrotech cartridge caused by excessive tightening of the base plug.
3. The grenade simulator and method as claimed in claim 1, wherein the said fume cap having a three circular step shape accommodated by pyrotech cartridge to avoid the positional disturbance of pyrotech cartridge caused by excessive tightening of the base plug increases the hit probability of the striking pin.
4. The grenade simulator and method as claimed in claim 1, wherein the said striker pin is provided with a two stage angular conical shaped striking needle with a small diameter flat at the bottom to avoid the damage and to increase the life of striking needle thereby increasing the hit probability of striking pin to accurately hit on to the centre point of the pyrotech cartridge.