F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
10/1, 85/106
F16B 25/00 (2006.01) B21H 3/02 (2006.01)
Patent
CA 1110474
THREAD FORMING SCREW WITH STEP TAPER AND DIES FOR MAKING THE SAME Abstract of the Disclosure A thread-forming screw has a point or lead thread portion having a relatively steep entry angle with respect to the screw axis. Adjacent to the point thread is a tapered thread portion of about two to three pitches in axial length. This tapered thread has a shallow entry angle defined by the taper of the maximum diameter of the thread toward the point. This shallow entry angle may be approxi- mately 5° to 8° or equal to about three times the helix angle of the tapered thread. This configuration of the tapered thread results in a balanced action of thread formation and axial in-feed of the screw, resulting in a lower end pressure to initiate the thread-forming in a workpiece. A roll-threading die is contoured to provide ridges and valleys to effect the tapered thread portion.
324645
Research Engineering & Manufacturing Inc.
Smart & Biggar
LandOfFree
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