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US 5,365,850 AGranted
Igniting device
AssigneeAutoliv Development AB
InventorsTorsten Persson, Staffan Calsson
Life of this patent
Estimating the term…
Abstract
A method and an arrangement to determine the lowest speed at which an activating pin activates a detonator, this being achieved by a hydraulic medium, the viscous property of which is used to control the transfer of energy from the activating pin to the detonator.
Claims8
Method of detonating a pyrotechnic charge, comprising the steps of:
- displacing a percussion pin at a speed;
- controlling a transfer of energy from the percussion pin to a percussion detonator cap using a substantially non-compressible deformable hydraulic medium disposed in a first cavity, the first cavity being connected via a constriction to a second cavity for receiving the medium when the percussion pin is displaced below a predetermined minimum speed, the constriction being dimensioned to prevent a substantial flow of the medium into the second cavity through the constriction when the percussion pin is displaced at at least a predetermined minimum speed;
- transmitting energy from the percussion pin to the percussion detonator cap when the percussion pin is displaced at at least the predetermined minimum speed;
- and
- activating the percussion detonator cap when the percussion pin is displaced at at least the predetermined minimum speed.
2 more elements
A detonator device for pyrotechnic charges, comprising:
- a percussion detonator cap;
- a displacable percussion pin for activating said percussion detonator cap when said percussion pin is displaced at at least a predetermined speed;
- and
- control means for controlling a transfer of energy from said percussion pin to said percussion detonator cap, said control means comprising a substantially non-compressible deformable hydraulic medium disposed in a first cavity, the first cavity being connected via a constriction to a second cavity, the constriction being dimensioned to permit the medium to pass therethrough into the second cavity when said percussion pin is displaced below the predetermined speed and being dimensioned to prevent a substantial flow of the medium into the second cavity when said percussion pin is displaced at at least the predetermined minimum speed so that energy from the percussion pin is transmitted to the percussion detonator cap thereby to activate the percussion detonator cap.
1 more element
Dependencies are inferred from the claim text.