초록 ▼

A new and improved thread rolling die, for forming a new and improved threaded fastener, comprises a plurality of first, primary thread rolling die threads, and a plurality of sets of second, auxiliary thread rolling die threads alternatively interposed between successive threads of the first, prima

A new and improved thread rolling die, for forming a new and improved threaded fastener, comprises a plurality of first, primary thread rolling die threads, and a plurality of sets of second, auxiliary thread rolling die threads alternatively interposed between successive threads of the first, primary thread rolling die threads, so as to render the manufacturing process more cost effective by reducing the the number of revolutions, through which a blank member must be rotated in order to complete the formation of the thread leads upon the blank member, to be accordingly reduced which, in turn, permits the axial length of the thread rolling dies, and the thread rolling machines, to be reduced in size.

대표청구항 ▼

The invention claimed is: 1. A thread rolling die for forming a threaded fastener, comprising: a body portion having a longitudinal axis; a working face disposed upon said body portion; a plurality of first, primary thread rolling die threads, disposed upon said working face of said body portion an

The invention claimed is: 1. A thread rolling die for forming a threaded fastener, comprising: a body portion having a longitudinal axis; a working face disposed upon said body portion; a plurality of first, primary thread rolling die threads, disposed upon said working face of said body portion and oriented at a predetermined angle with respect to said longitudinal axis of said body portion, for forming a first, primary thread lead, comprising a plurality of first, primary threads, upon a blank member, wherein said plurality of first, primary thread rolling die threads are spaced from each other by means of first predetermined transversely spaced distances such that the first, primary threads are successively formed upon the blank member at first predetermined positions which are spaced from each other by means of first predetermined axially spaced distances; and a plurality of sets of second, auxiliary thread rolling die threads, disposed upon said working face of said body portion at positions transversely interposed between said plurality of first, primary thread rolling die threads and oriented at a predetermined angle with respect to said longitudinal axis of said body portion, for forming a dual set of second, auxiliary thread leads, each comprising a plurality of second, auxiliary threads, upon the blank member, wherein said plurality of second, auxiliary thread rolling die threads, comprising each one of said plurality of sets of second, auxiliary thread rolling die threads, are spaced from each other by means of second predetermined transversely spaced distances such that, as a result of said disposition of said plurality of sets of second, auxiliary thread rolling die threads, for forming said dual set of second, auxiliary threads, between said plurality of first, primary thread rolling die threads, when the plurality of first, primary threads are successively formed upon the blank member at the first predetermined positions, the distances through which material portions of the blank member, utilized for forming the plurality of first, primary threads upon the blank member, need to be moved is effectively minimized thereby, in turn, minimizing the length dimension of said thread rolling die required to completely form the threaded fastener from the blank member. 2. The thread rolling die as set forth in claim 1, wherein: each one of said plurality of sets of second, auxiliary thread rolling die threads, disposed upon said working face of said body portion, comprises three, transversely spaced auxiliary thread rolling die threads for forming said dual set at second auxiliary thread leads upon the blank member. 3. The thread rolling die as set forth in claim 2, wherein: each one of said three, transversely spaced auxiliary thread rolling die threads has a transverse width dimension within the range of 0.003-0.010 inches such that the transverse distance defined between the second, auxiliary thread leads, comprising each one of said dual set of second, auxiliary thread leads, formed upon the blank member, is within the range of 0.003-0.010 inches. 4. The thread rolling die as set forth in claim 1, wherein: said plurality of sets of second, auxiliary thread rolling die threads are disposed upon said working face of said body portion at positions which are transversely spaced from each other by means of third predetermined distances which are substantially equal to said first predetermined distances through which said plurality of first, primary thread rolling die threads are spaced from each other. 5. The thread rolling die as set forth in claim 1, wherein: the depth of said plurality of first, primary thread rolling die threads disposed upon said working face of said body portion is at least twice the depth of said plurality of second, auxiliary thread rolling die threads disposed upon said working face of said body portion. 6. The thread rolling die as set forth in claim 1, wherein: the depth of said plurality of first, primary thread rolling die threads disposed upon said working face of said body portion increases continuously throughout the axial length of said thread rolling die while the depth of said plurality of second, auxiliary thread rolling die threads disposed upon said working face of said body portion is constant after attaining a predetermined depth. 7. The thread rolling die as set forth in claim 1, wherein: each one of said plurality of sets of second, auxiliary thread rolling die threads are transversely spaced from said plurality of first, primary thread rolling die threads by means of predetermined fourth distances; and wherein further, said first predetermined transversely spaced distances, defined between said plurality of first, primary thread rolling die threads, are equal to twice said predetermined fourth axially spaced distances defined between said plurality of sets of second, auxiliary thread rolling die threads. 8. A thread rolling die for forming a threaded fastener, comprising: a body portion having a longitudinal axis; a working face disposed upon said body portion; a plurality of first, primary thread rolling die threads, disposed upon said working face of said body portion and oriented at a predetermined angle with respect to said longitudinal axis of said body portion, for forming a first, primary thread lead, comprising a plurality of first, primary threads, upon a blank member, wherein said plurality of first, primary thread rolling die threads are spaced from each other by means of first predetermined transversely spaced distances such that the first, primary threads are successively formed upon the blank member at first predetermined positions which are spaced from each other by means of first predetermined axially spaced distances; and a plurality of sets of second, auxiliary thread rolling die threads, respectively disposed upon said working face of said body portion at positions transversely interposed between said plurality of first, primary thread rolling die threads and oriented at a predetermined angle with respect to said longitudinal axis of said body portion, for forming a dual set of second, auxiliary thread leads, each comprising a plurality of second, auxiliary threads, upon the blank member, wherein said plurality of second, auxiliary thread rolling die threads, comprising each one of said plurality of sets of second, auxiliary thread rolling die threads, are spaced from each other by means of second predetermined transversely spaced distances such that, as a result of said disposition of said plurality of sets of second, auxiliary thread rolling die threads, for forming said dual set of second, auxiliary threads upon the blank member, between said plurality of first, primary thread rolling die threads, when the plurality of first, primary threads are successively formed upon the blank member at the first predetermined positions, the distances through which material portions of the blank member, utilized for forming the plurality of first, primary threads upon the blank member, need to be moved is effectively minimized thereby, in turn, minimizing the number of revolutions that the blank member must undergo during the entire thread forming process whereby, in turn, the length dimension of said thread rolling die, required to completely form the threaded fastener from the blank member, may be correspondingly minimized. 9. The thread rolling die as set forth in claim 8, wherein: each one of said plurality of sets of second, auxiliary thread rolling die threads, disposed upon said working face of said body portion, comprises three, transversely spaced auxiliary thread rolling die threads for forming said dual set of second auxiliary thread leads upon the blank member. 10. The thread rolling die as set forth in claim 9, wherein: each one of said three, transversely spaced auxiliary thread rolling die threads has a transverse width dimension within the range of 0.003-0.010 inches such that the transverse distance defined between the second, auxiliary thread leads, comprising each one of said dual set of second, auxiliary thread leads, formed upon the blank member, is within the range of 0.003-0.010 inches. 11. The thread rolling die as set forth in claim 8, wherein: said plurality of sets of second, auxiliary thread rolling die threads are disposed upon said working face of said body portion at positions which are transversely spaced from each other by means of third predetermined distances which are substantially equal to said first predetermined distances through which said plurality of first, primary thread rolling die threads are spaced from each other. 12. The thread rolling die as set forth in claim 8, wherein: the depth of said plurality of first, primary thread rolling die threads disposed upon said working face of said body portion is at least twice the depth of said plurality of second, auxiliary thread rolling die threads disposed upon said working face of said body portion. 13. The thread rolling die as set forth in claim 8, wherein: the depth of said plurality of first, primary thread rolling die threads disposed upon said working face of said body portion increases continuously throughout the axial length of said thread rolling die while the depth of said plurality of second, auxiliary thread rolling die threads disposed upon said working face of said body portion is constant after attaining a predetermined depth. 14. The thread rolling die as set forth in claim 8, wherein: each one of said plurality of sets of second, auxiliary thread rolling die threads are transversely spaced from said plurality of first, primary thread rolling die threads by means of predetermined fourth distances; and wherein further, said first predetermined transversely spaced distances, defined between said plurality of first, primary thread rolling die threads, are equal to twice said predetermined fourth axially spaced distances defined between said plurality of sets of second, auxiliary thread rolling die threads. 15. A thread rolling die system comprising a set of thread rolling dies for forming a threaded fastener from a blank member, wherein each one of said thread rolling dies comprises: a body portion having a longitudinal axis; a working face disposed upon said body portion; a plurality of first, primary thread rolling die threads, disposed upon said working face of said body portion and oriented at a predetermined angle with respect to said longitudinal axis of said body portion, for forming a first, primary thread lead, comprising a plurality of first, primary threads, upon a blank member, wherein said plurality of first, primary thread rolling die threads are spaced from each other by means of first predetermined transversely spaced distances such that the first, primary threads are successively formed upon the blank member at first predetermined positions which are spaced from each other by means of first predetermined axially spaced distances; and a plurality of sets of second, auxiliary thread rolling die threads, respectively disposed upon said working face of said body portion at positions transversely interposed between said plurality of first, primary thread rolling die threads and oriented at a predetermined angle with respect to said longitudinal axis of said body portion, for forming a dual set of second, auxiliary thread leads, each comprising a plurality of second, auxiliary threads, upon the blank member, wherein said plurality of second, auxiliary thread rolling die threads, comprising each one of said plurality of sets of second, auxiliary thread rolling die threads, are spaced from each other by means of second predetermined transversely spaced distances such that, as a result of said disposition of said plurality of sets of second, auxiliary thread rolling die threads, for forming said dual set of second, auxiliary threads upon the blank member, between said plurality of first, primary thread rolling die threads, when the plurality of first, primary threads are successively formed upon the blank member at the first predetermined positions, the distances through which material portions of the blank member, utilized for forming the plurality of first, primary threads upon the blank member, need to be moved is effectively minimized thereby, in turn, minimizing the number of revolutions that the blank member must undergo during the entire thread forming process whereby, in turn, the length dimension of said thread rolling die, required to completely form the threaded fastener from the blank member, may be correspondingly minimized. 16. The system of thread rolling dies as set forth in claim 15, wherein: each one of said plurality of sets of second, auxiliary thread rolling die threads, disposed upon said working face of said body portion, comprises three, transversely spaced auxiliary thread rolling die threads for forming said dual set of second auxiliary thread leads upon the blank member. 17. The system of thread rolling dies as set forth in claim 16, wherein: each one of said three, transversely spaced auxiliary thread rolling die threads has a transverse width dimension within the range of 0.003-0.010 inches such that the transverse distance defined between the second, auxiliary thread leads, comprising each one of said dual set of second, auxiliary thread leads, formed upon the blank member, is within the range of 0.003-0.010 inches. 18. The system of thread rolling dies as set forth in claim 15, wherein: said plurality of sets of second, auxiliary thread rolling die threads are disposed upon said working face of said body portion at positions which are transversely spaced from each other by means of third predetermined distances which are substantially equal to said first predetermined distances through which said plurality of first, primary thread rolling die threads are spaced from each other. 19. The system of thread rolling dies as set forth in claim 15, wherein: the depth of said plurality of first, primary thread rolling die threads disposed upon said working face of said body portion is at least twice the depth of said plurality of second, auxiliary thread rolling die threads disposed upon said working face of said body portion. 20. The system of thread rolling dies as set forth in claim 15, wherein: the depth of said plurality of first, primary thread rolling die threads disposed upon said working face of said body portion increases continuously throughout the axial length of said thread rolling die while the depth of said plurality of second, auxiliary thread rolling die threads disposed upon said working face of said body portion is constant after attaining a predetermined depth. 21. The system of thread rolling dies as set forth in claim 15, wherein: each one of said plurality of sets of second, auxiliary thread rolling die threads are transversely spaced from said plurality of first, primary thread rolling die threads by means of predetermined fourth distances; and wherein further, said first predetermined transversely spaced distances, defined between said plurality of first, primary thread rolling die threads, are equal to twice said predetermined fourth axially spaced distances defined between said plurality of sets of second, auxiliary thread rolling die threads. 22. The system of thread rolling dies as set forth in claim 15, wherein: a first one of said thread rolling dies comprises a stationary thread rolling die; and a second one of said thread rolling dies comprises a movable thread rolling die moved longitudinally with respect to said stationary rolling die.