EP 0250737 B1 19900613 - TIME FUZE FOR BLASTING
Title (en)
TIME FUZE FOR BLASTING
Publication
Application
Priority
DE 3614204 A 19860426
Abstract (en)
[origin: US4809610A] A nonelectric delay detonator has means for allowing an ignition flame to be transmitted from an ignition transfer hose to a delay device. The delay device causes a secondary charge to detonate after a predetermined delay time. In order to obtain reproducibile delay times of the delay device, a check valve is arranged between one end of the ignition transfer hose and the delay device; this check valve being opened for a short time period due to the excess pressure in the hose and permitting the ignition flame to pass through. During deflagration of the delay device, the check valve is closed again so that the delay device burns within a closed system. In this manner, undefined pressure and gas losses are avoided.
IPC 1-7
IPC 8 full level
F42B 3/16 (2006.01); F42C 9/10 (2006.01); F42C 15/34 (2006.01)
CPC (source: EP US)
F42B 3/16 (2013.01 - EP US); F42C 15/34 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI NL SE
DOCDB simple family (publication)
DE 3614204 A1 19871029; BR 8701963 A 19880202; CA 1282639 C 19910409; DE 3763249 D1 19900719; EP 0250737 A1 19880107; EP 0250737 B1 19900613; ES 2015912 B3 19900916; GR 3000767 T3 19911010; JP S62258999 A 19871111; US 4809610 A 19890307; ZA 872932 B 19871019
DOCDB simple family (application)
DE 3614204 A 19860426; BR 8701963 A 19870424; CA 535523 A 19870424; DE 3763249 T 19870411; EP 87105426 A 19870411; ES 87105426 T 19870411; GR 900400624 T 19900907; JP 10018887 A 19870424; US 92120386 A 19861021; ZA 872932 A 19870424