Time delay primer and method of using same
US4167139A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1977 |
| Grant date | Sep 11, 1979 |
| Priority date | — |
| Expiry date | May 23, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42D1/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A delay primer unit for detonating an explosive material in a borehole with a detonating cord down line extending into the borehole wherein the unit comprises an explosive element capable of detonating the explosive material upon being detonated, means for preventing direct detonation of the explosive element by the down line and an elongated, flexible time delay detonation element having a first end slidably connected to the down line and a second end connected in detonation relationship with the explosive element and generally movable with respect to the first end. The delay element is used to mount the explosive element on the down line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.