Title of Invention

AN EXPLOSIVE DEVICE AND A PROCESS OF MANUFACTURE THEREOF .

Abstract

An explosive device comprising a flat round base housing (2) of 100 to 150 mm diameter and 16 to 28 mm height for accommodating the explosive mixture therein, a small central tubular passage of > 0 < 5 mm diameter provided along the diameter of said flat base (3) and adapted to accommodate the detonator or detonating cord / fuse for causing an initiation of a blast, said central tubular passage dividing the housing into two equal semicircular portions (5 and 6).

Full Text

This invention relates to a process for the manufacture of an explosive device for use as an explosive charge and/or as a booster for initiating the main explosive charge in bulk or in packaged forms. Boosters generally known in the art are capable of initiating the main explosive charge or explosive cartridge. Such boosters comprised a mixture of trinitrotoluene (TNT) pentaerythritol tetra nitrate (PETN) in the ratio of 1:1 . This mixture is filled in a verticle cylindrical casing having a central housing for accommodating a detonator cord. Such boosters are mnormally used for mining applications. The process for manufacture of booster comprises in casting/pressing the explosive composition in the cylindrical casing of 60-85°C and allowing said casing to the step of cooling for setting said explosive composition therein. Several distinct disadvantages are associated with the booster known as such boosters are not useful to be used as an explosive itself. Yet another disadvantage is that such boosters do not possess useful applications for blasting of rock boulders/ hangings in vertical shaft/ tunnels/ mine pillers etc. Yet another disadvantage is that the boosters are not efficient. Another disadvantage is that the density of the booster is not uniform due to quick settling of PETN during the casting process. Therefore/ a primary object of the present invention is to propose an explosive device capable of being used as an explosive charge itself and/or as a booster for initiating the main explosive charge. Another object of the present invention is to provide an explosive device having large surface area of contact for an economical blasting applications. Yet another object of the present invention is to provide an explosive device capable of being used to blast rock boulders, hangings in vertical shaft/ tunnels, mine pillers etc. Still another object of the present invention is to provide an explosive device which is efficient According to this invention there is provided an explosive device comprising a flat round base housing for accommodating the explosive mixture therein, a central tubular passage provided along the diameter of said flat base and adapted to accommodate the detonator or detonating cord/fuse for causing an initiation of a blast, said central tubular passage dividing the housing into two equal portions. According to this invention there is also provided a process for manufacture of an explosive device comprising filling the flat round based housing with the explosive composition, and subjecting said housing to the step of curing at ambient temperature In accordance with the present invention, the booster has a round flat based housing with a central tubular passage. therein along the diameter of said housing which divides the housing into two equal portions. The round shape of the booster provides a maximum surface contact area of the booster with the target to be exploded. Further, the flat base round housing allows a concentration of a maximum energy towards the target to be exploded. Also the housing provides a physical shape to the explosive disposed in the housing. The housing is filled with the explosive composition and then the housing is allowed to the step of curing for 70 to 90 nours at an ambient temperature. A process for the manufacture of an explosive device according to a preferred embodiment of tne present invention is herein described and illustrated in the accompanying drawing and examples wherein:- Fig.l shows the top perspective view of the explosive device; Fig.2 shows the sectional view along section A,A in fig. 1; Fig.3 shows the sectional view along section B,B in fig. 2; Fig,4 shows the sectional view along A,A according to another embodiment and Fig.5 shows the sectional view along section C,C in fig. 4. Referring to the drawings particular fig.l the explosive device for use as an explosive charge itself or explosive booster for initiating the main explosive charge in bulk or in packaged forms has a circular housing 2 having a base 3. A tubular passage 4 is provided along the diameter of the base 3 in the nousing 2 for accommodating the detonator or detonating cord (not shown)for causing an initiation of the olast. The central tubular passage 4 devide the housing into two equal portions 5 and 6 of the semi circular shape. The tubular passage 4 is casted integrally with the base 3 of the housing 2 as shown in fig. 3. According to an embodiment and as shown in fig. 4 the central tubular passage 4 is provided above the base 3 of the housing 2 and as shown in fig. 5. Further for the manufacture of the explosive device the explosive material/composition(not shown) is filled in the semi circular portions 5 and 6 upto the height of the housing 2. fhe housing 2 duly filled in with the explosive material is subjected to the step of curing for 70 to 90 hours at an ambient/room temperature. A detonator or detonat cord(not shown) is provided in the tubular 4 for blasting purposes of the device/charge itself or as the booster for initiation of the bulk amount of the explosive charge. EXAMPLES: 1. 180 gm explosive composition was filled in a circular plastic casing of 100 mm diameter and 16 mm height. The housing was allowed to the step of curing for a period of 72 hours at room temperature. The cured housing was tested for measuring the cater formation and its strength was 15% higher than the booster having the known explosive filled therein. 2. 226 gm explosive was filled in a circular plastic casing of 100 mm diameter and 20 mm height. The housing was allowed to the step of curing for a period of 75 hours at room temperature. The cured housing was tested for measuring the cater formation and its strength was 15% higher than the booster having the known explosive filled therein. 3. 377 gms explosive composition was filled in a circular plastic casing of 125 mm diameter and 27 mm height. The housing was allowed to the step of curing for a period of 80 hours at room temperature. The cured housing was tested for measuring the cater formation and its strength was 15% higher than the booster having the known explosive filled therein. 484 gms explosive composition was filled in a circular plastic casing of 150 mm diameter and 19 mm height. The housing was allowed to the step of curing for a period of 73 hours at room temperature. The cured housing was tested for measuring the cater formation and its strength was 15% higher than the booster having the explosive composition filled therein. 5. 725 gms explosive composition was filled in a circular plastic casing of 150 mm diameter and 28 mm height. The housing was allowed to the step of curing for a period of 85 hours at room temperature. The cured housing was tested for measuring the cater formation and its strength was 15% higher than the booster having the explosive composition filled therein. WE CLAIM: 1. An explosive device comprising a flat round base housing (2) of 100 to 150 mm diameter and 16 to 28 mm height for accommodating the explosive mixture therein, a small central tubular passage of > 0 mm diameter provided along the diameter of said flat base (3) and adapted to accommodate the detonator or detonating cord / fuse for causing an initiation of a blast, said central tubular passage dividing the housing into two equal semicircular portions (5 and 6). 2. An explosive device as claimed in claim 1 wherein said central tubular passage is provided above the base / bottom of said housing. 3. An explosive device substantially as herein described. 4. A process for manufacture of explosive device as claimed in claim 1 comprising filling the flat round based housing with the explosive composition and subjecting said housing to the step of curing at ambient temperature. 5. A process as claimed in claim 4 wherein said step of curing is carried on for a period of 70 to 90 hours at room temperature. An explosive device comprising a flat round base housing (2) of 100 to 150 mm diameter and 16 to 28 mm height for accommodating the explosive mixture therein, a small central tubular passage of > 0 the diameter of said flat base (3) and adapted to accommodate the detonator or detonating cord / fuse for causing an initiation of a blast, said central tubular passage dividing the housing into two equal semicircular portions (5 and 6).

Documents:

822-cal-1992-granted-abstract.pdf

822-cal-1992-granted-claims.pdf

822-cal-1992-granted-correspondence.pdf

822-cal-1992-granted-description (complete).pdf

822-cal-1992-granted-drawings.pdf

822-cal-1992-granted-examination report.pdf

822-cal-1992-granted-form 1.pdf

822-cal-1992-granted-form 18.pdf

822-cal-1992-granted-form 2.pdf

822-cal-1992-granted-form 5.pdf

822-cal-1992-granted-pa.pdf

822-cal-1992-granted-reply to examination report.pdf

822-cal-1992-granted-specification.pdf