Three-phase hypervelocity projectile launcher

Details Three-phase hypervelocity projectile launcher Three-phase hypervelocity projectile launcher

1993-10-15

1994-12-06

Brown, David

Ammunition and explosives

Blasting

Detonation wave modifying

89 115, 102476, 175 46, F42B 102, F42B 308, F42B 1210, F42B 1216

Patent

active

053700554

ABSTRACT:
A hypervelocity projectile launcher for use in perforating borehole casings provides improved penetration into the surrounding rock structure. The launcher includes a first cylinder of explosive material that defines an axial air-filled cavity, a second cylinder of explosive material defining an axial frustum-shaped cavity abutting and axially aligned with the first cylinder. A pliant washer is located between and axially aligned with the first and second cylinders. The frustum shaped cavity is lined with a metal liner effective to form a projectile when the first and second cylinders are detonated. The washer forms a unique intermediate projectile in advance of the liner projectile and enables the liner projectile to further penetrate into and fracture the adjacent rock structure.

REFERENCES:
patent: 4004515 (1977-01-01), Mallory et al.
patent: 4672896 (1987-06-01), Precoul et al.
patent: 4860654 (1989-08-01), Chawla et al.
patent: 4955939 (1990-09-01), Petrousky et al.
patent: 5166469 (1992-11-01), Kerdraon et al.
patent: 5223666 (1993-06-01), Delaney

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