Device for firing an electric detonator
First Claim
1. A firing assembly for firing an explosive charge underwater, comprising a sealed waterproof housing having a wall portion formed by a bellows element deformable in response to external pressure on the housing, a piezo-electric transducer element positioned within said housing so as to be compressible by the deformation of said bellows element, and an electric detonator having a fusehead electrically connected in circuit with said piezo-electric transducer element whereby said detonator is fired when the bellows element is sufficiently deformed by said external pressure to cause the said transducer element to generate the required voltage.
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Accused Products
Abstract
A device for firing an electric detonator which comprises a pressure deformable sealed waterproof housing containing an electric energy source for ignition of a detonator and means responsive to the deformation of the housing for actuating the energy source. The housing preferably comprises a bellows element and the energy source is preferably a piezoelectric element. The device is useful for multiple shot blasting wherein one explosive charge is initiated by the shock wave from a previously exploded charge.
21 Citations
5 Claims
- 1. A firing assembly for firing an explosive charge underwater, comprising a sealed waterproof housing having a wall portion formed by a bellows element deformable in response to external pressure on the housing, a piezo-electric transducer element positioned within said housing so as to be compressible by the deformation of said bellows element, and an electric detonator having a fusehead electrically connected in circuit with said piezo-electric transducer element whereby said detonator is fired when the bellows element is sufficiently deformed by said external pressure to cause the said transducer element to generate the required voltage.
Specification