Improvement In Methods Of Manufacturing Bullets. (US patent, Kean bullets)
NOTE: Not exactly swaging, but... This is how
Winchester used machines to alter existing hollow point bullets to
the "Kean" split tip bullet.
Images are here, might not make sense, but they are included.
Specifcation forming part of Letters Patent No. 219,840, dated
September 23, 1879; application filed July 28, 1879.
To all whom it may concern:
Be it known that I, WILLIAM W. WINCHESTER, of New Haven, in the
county of New Haven and State of Connecticut, have invented
certain Improvements in Methods of Manufacturing Bullets, of which
the following is a specification.
This invention relates to an improved method of manufacturing what
are known in the art as the “ Kean split or cruciform bullets.”
These bullets have their forward ends provided with closed seams
or slits, to facilitate the opening or spreading action upon
encountering a bone or other hard resisting; object. These bullets
are provided in the forward end with a central hole or cavity, a
cap or plug to close the same, and with a series of closed seams
or slits extending lengthwise and radiating from the central hole,
whereby they are caused to expand and spread the more readily upon
encounter in a bone or other hard resistance.
Hitherto the usual method pursued in the manufacture of these
balls consisted in casting them in a complicated mold, with the
recess and open slits in the front end, and subsequently finishing
them and closing the seams by dies. This plan permitted the
casting of but few bullets at a time, and rendered the production
so slow and expensive that their general adoption was prevented.
My improved method consists in first casting the bullet with the
recess, but without the slits, subsequently producing the slits by
means of a saw or a knife, of suitable form, actuated by
machinery, and finally compressing the bullet in a die to close
the slits.
Figure 1 represents the bullet in its first form, the figure
showing a longitudinal section and an end view. Fig. 2 illustrates
the bullet as it appears after the cutting of the slits therein.
Fig. 3 represents the finished bullet; Fig. 4, one form of the
cutting or slitting tool; Fig. 5, one form of the die for
compressing the bullet and closing the slits.
The bullet A is first made by casting or swaging in the form shown
in Fig. 1, with a solid or unbroken front end having a central
cavity or hole, a, therein. subjected to the action of a ‘knife or
slitting punch, B, such as shown in Fig. 4, or any other suitable
knife, saw, or other cutting tool, where by the longitudinal
radial slits c are formed in the front end of the bullet, as shown
in Fig. 2. After these slits are made the bullet is acted upon by
a die, C, such as shown in Fig. 5, or any equivalent compressing
device, where by it is compressed and reduced at the forward end,
so as to close tightly the slits and give the bullet a smooth
finished appearance. In other respects the exterior of the ball
may be finished in any approved or desired manner.
The hole may be left open or closed by means of the inverted
sheet-metal shell or cap e, as shown, or by other ordinary means.
My invention relates solely to the method of producing the body of
the bullet.
What I claim as my invention is—
The herein-described method of making expansive bullets,
consisting in first making the bullet with an unbroken tubular
front end, subsequently cutting the slits therein, and finally
compressing the front 'end to close the slits, substantially as
set forth.
WILLIAM W. WINCHESTER.
Witnesses:
DANIEL H. VEADER,
WM. W. CONVERSE.