US 5,031,538 A · Delay train ignition buffer

Abstract

A delay train ignition buffer (45) is positioned between a transmission tube (11) and a delay train (25) in a detonator housing (15) or a signal transmission tube housing. The buffer controls the rate at which the transmission tube temperature/pressure pulse is applied to the delay train pyrotechnic surface, attenuating the effects of the pulse with a resulting improvement in delay timing precision. The buffer also attenuates the effects of sudden depressurization within the detonator resulting from the rupture of the transmission tube or ejection of the tube from the housing, thereby preventing separation of the reacting pyrotechnic which could otherwise cause the reaction to cease at the point of separation, thus causing failure of the delay train to continue combustion of the pyrotechnic through its length.

Claims10

Dependent claims

A signal delay assembly, for use with a blasting signal transmission device, comprising:

a housing;
a delay train, positioned within said housing, including a pyrotechnic composition for transmitting a blasting initiation signal to provide a preselected time delay from a first side of said delay train to a second side of said delay train;
and
a buffer element, positioned between an input end of said housing and said delay train first side for allowing signal transmission while controlling the rate that pressure is applied to said delay train and for retaining said pyrotechnic composition in the event of rupture of said transmission device or ejection of said transmission device from said housing.

1 more element

Dependencies are inferred from the claim text.

Delay train ignition buffer

Life of this patent

Delay train ignition buffer

Life of this patent

Abstract

Claims10