Hand-held shot tube detonator
AssigneeEIT Co., Ltd.
InventorHoward Lawrence
Life of this patent
Estimating the term…
Abstract
A hand-held shot tube detonator including a primer and shot tube holder removably mounted on a firing pin body having a flash guard movable between extended and retracted positions. The flash guard is retracted to permit mounting of the holder on the body and is then extended to surround the holder to channel the flash and explosive gases away from the operator when the detonator is fired.
Claims33
A detonator of the type including a firing pin body with a firing pin, a spring biasing the firing pin toward a firing position, and a trigger operable to release the firing pin for movement to the firing position, wherein the improvement comprises a holder separate from the body having a cap bore for receiving an explosive primer, at least one vent passage in the holder intersecting the cap bore, a hollow neck extending away from the cap bore adapted to surround the upstream end of a shot tube or the like, the interior of the neck communicating with the primer bore;
- and means for removably mounting the holder on the firing pin body with the bore at the firing position, said means including abutting surfaces on said body and holder preventing movement of the holder away from the firing position when the primer is fired whereby the shock wave and blast expand from the primer bore into and along the interior of the neck to ignite the shot tube and are vented through the passage.
A detonator of the type having a body, a primer bore, a firing pin, a spring biasing the firing pin toward the bore to detonate an explosive primer in the bore, a trigger for releasing the firing pin to detonate the primer and a vent passage communicating with the bore, wherein the improvement comprises a hollow thin-walled neck extending away from the end of the bore remote from the trigger, said neck being adapted to receive the upstream end of the slot tube or the like whereby the shock wave and pyrotechnic blast from the firing of a primer travel through the neck to ignite the tube and are vented through the vent passage.
A detonator including a body having a primer receiving cavity, a vent passage communicating with said cavity with the exterior of the body, a firing passage communicating with said primer cavity and including an end away from the primer cavity adapted to receive the upstream end of a shot tube or the like, and firing pin means for igniting a primer in the cavity so that the flash travels through said firing passage to ignite the shot tube and is vented through the vent passage.
Dependencies are inferred from the claim text.