F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/107
F16B 25/10 (2006.01)
Patent
CA 2008383
ABSTRACT OF THE DISCLOSURE A breakable composite drill screw comprises a first shank made of a metal unsusceptible of hardening, a driving head extending from one end of the first shank and engageable with a screw driving tool, a second shank made of another metal susceptible of hardening, the second shank being fix- edly adjoined to the other end of the first shank to thereby provide a break zone at said other end, a drill bit formed by cold forging at an end of the second shank, a continuous thread formed by thread-rolling to extend around both outer cylindrical peripheries of the first and second shank wherein a portion extending from the break zone to the drill bit is hardened or quenched, and wherein said shanks are adjoined at their engaging surfaces to each other by projection- welding technique making use of a welding lug protruding from either engaging surface, said lug forming the break zone. -10-
Kirby Eades Gale Baker
Yugen Kaisha Shinjoseisakusho
LandOfFree
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