Delayed action striking device which may be utilized for the priming of detonators
AssigneeTechnical Arco Establishment-Schaan
InventorFederico Engeli
Life of this patent
Estimating the term…
Abstract
The delayed action striking device comprises, in combination with a pressure cap beneath which there is a not air-tight closed air chamber, defined on the other side by a stiff diaphragm and in communication with a member delaying the bursting, a firing pin which can slide against the bias of a spring into a small cylinder carried by the diaphragm and controlled through a lever which is acted on by a safety catch. Two bursting charges are concentrically placed, of which the inner one contains the detonator which rests beneath the firing pin. The safety catch comprises a small rod, inserted within the casing of the mine between a flap carried by the control of the firing pin and a projection integral with the casing of the mine.
Claims2
A delayed action striking device for priming detonators of mines and the like, comprising, in combination, an outer casing;
- a pressure cap closing an end of said casing;
- a relatively stiff diaphragm seated in said casing and defining, with said pressure cap, an air chamber which is not closed airtight;
- an expansible lung in said casing in communication with said air chamber, and constituting a bursting delay device;
- two concentric annular bursting charges seated in said casing;
- a detonator seated centrally in the inner one of said bursting charges;
- a cylinder carried by said diaphragm in axial alignment with said detonator and spaced axially therefrom;
- a firing pin slidable in said cylinder;
- spring means in said cylinder biasing said firing pin toward said detonator;
- a displaceable lever controlled by said delay device and normally blocking movement of said firing pin to impact said detonator;
- said delay device, responsive to pressure on said pressure cap, effecting a delayed release of said lever to release said firing pin to impact said detonator to ignite successively the inner and outer bursting charges;
- a retractible safety device engaged with said lever and preventing movement of said lever in a direction to release said firing pin;
- said safety device comprising a rod insertable substantially radially into said casing with its inner end in engagement with said lever to restrain said lever from moving to a position releasing said firing pin;
- a first projection fixed on said casing and a second projection carried by said lever;
- said rod being engageable between said first and second projections to prevent movement of said lever in a direction to release said firing pin.
Dependencies are inferred from the claim text.