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(11)    Patent No :    AP 2640   
(21)    Application No :    AP/P/2008/004608   
(22)    Filing Date :    22.03.2007   
(24)    Date of Grant &    11.04.2013   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
ZA    2006/02425    24.03.2006

(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW

(73) Applicant(s)

AEL MINING SERVICES LIMITED, AECI Place, 23/24 The

Woodlands, Woodlands Drive, Woodmead, Gauteng,
South Africa
(72) Inventors
ROWE Anthony John, South Africa
ONRADIE Cornelius du Plooy, South Africa
(74) Representative
GILL, GODLONTON & GERRANS
ZIMBABWE
 
(51)  International  Classification   F42B 3/10 (2006.01)    C06C 7/00 (2006.01)
A42C 9/10 (2006.01)   
(54)    Title
Detonation of explosives
(57)    Abstract

This invention relates to a time delay element, for use in a chemical detonator, the time delay element including an assembly, in a tubular casing having open ends, of: a timer charge made of a timing composition; a sealing charge made of a pyrotechnic material at one end of the timer charge, in contact therewith and in scaling contact with the inner surface of the tubular casing; a priming charge in contact with the end of the timing charge opposite the sealing charge; and at least pan of a base charge being in contact with the end of the priming charge opposite the timer charge. The invention also extends to a chemical detonator including such a lime delay element, and it extends, further still, to a method of manufacturing such time delay elements.

(56)    Documents Cited :    FR-2642158 A1    US -3306201 A

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