Improvements in or relating to Metal Working Fresses, specially applicable for Making Lock Nuts.
Year: 1897

page_text: Date of Application, 13th May, 1897-Accepted, 23rd Oct., 1897
Improvements in or relating to Metal Working Fresses, specially
applicable for Making Lock Nuts.
A communication from THE RICHARDSON LOCKNUT COMPANY, of 46 Niagara Street,
Buffalo, New York, United States of America.
I, ALFRED JULIUS BOULT of 111 Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement;-
―
The invention relates to metal working presses, and is especially applicable for
making twisted lock-nuts like that illustrated in Fig. 6 of the drawings; some of
the features of which invention are applicable to machines for making other articles,
as well as to die presses. The nut which the invention is particularly adapted
to make is of usual shape, and is cut between its opposite faces, at a, to form two
portions, b, one of which is slightly twisted relative to the other, so that the screw-
threads in the two parts are slightly out of line with each other.
Figure 1 is a perspective view of a machine embodying the invention. Fig. 2
is an enlarged front elevation of part of the machine, portions being shown in vertical
section. Figs. 3, 4 and 5 are detail views.
The machine has many of the parts of an ordinary die press, such as the frame-
composed of the base, 2, a shelf, 3, and a standard, 4; a driving shaft, 5, on which
is a band wheel, 6; the reciprocating head, 8, mounted between ways, 7; and the
eccentric, 9, strap, 10, and link, 11.
The mechanism for twisting the nuts consists essentially of a holding die, a
twisting or operating die, and mechanism for imparting to the twisting die a slight
twisting or rotary movement, when both dies are brought into engagement with
the nut.
The holding die is mounted upon the shelf, 3, and is held firmly during the
twisting of the nut, and hence may be called the "stationary, die" although it
is movable at other times than while the twisting operation is being performed.
While a single holding die might be used, it is preferred to arrange a plurality,
of such dies in a common die-carrier, 28, which is secured to the lower end of a
shaft, 29, and intermittently rotated; preferably, by means of a worm wheel, 30,
on the shaft, 29, and a worm, 31, on the shaft, 5. The worm is of peculiar con-
struction, see Fig. 3,-its thread being, for a considerable portion of its extent,
straight and arranged in a plane transverse to the axis of the shaft, 5; and for a
shorter portion, inclined. The straight portion of the thread gives a rest to the
die carrier; and the inclined portion causes it to move. By this arrangement the
die carrier is intermittently moved and stopped, the relative duration of the rest
being dependent upon the relative length of the straight portion of the worm
thread.
The twisting die, 13, is carried by the head, 8. It is mounted in the end of a
die-holder, 15, that fits over a cylindrical bearing, 14, upon which it is free to

page_text: move to a limited extent. A spring, 17, preferably mounted in a chamber, 16,
in the bearing piece, 14, tends to force the die-holder off its support; but this is
prevented by the studs, 18, which pass through inclined slots, 19, in the die holder.
The walls of these slots constitute cams, and, together with the studs, operate to
cause a turning of the die carrier about its support, whenever there is a longitudinal
movement of one of these parts (14 or 15) relative to the other. Other forms
of cams or equivalent devices might be employed in lieu of the slots and studs
for effecting like results.
The extent to which the twisting die is turned at each reciprocation of the head,
and hence the amount of twist imparted to the nut may be varied, by varying the
extent of the reciprocation of the head. Various means may be employed for
effecting this, one being illustrated in Fig. 5, wherein 40 represents an eccentric
upon the shaft, 5; and 9, an eccentric collar arranged between the eccentric, 40,
and the strap, 10. This collar may be adjusted by the pinion, 41, and the different
positions which it is made to occupy operate to change the effective movement of
the eccentric. Other well known means may be employed for the same purpose.
22 is a spring-actuated plunger which extends into the cavity in the die, 13; and
operates as an ejector to discharge the nut from the die, after it has been twisted.
The carrier for the holding dies should be locked while each nut is being twisted
to effect which the edge of the plate, 28, is notched, as at 32; and the reciprocating
head is provided with a pin, 33, which, when the head descends, engages with
one of the notches. The pin should preferably be of a length sufficient to extend
through the table, 3,-for a purpose to be hereinafter described, and that
portion, 33, of the pin which extends past the edge of the plate, 28, when the head
is raised, should be cut away on one side, see Fig. 4,--so that the holding-die-
carrier may freely turn, without interference from the pin, when the head is
raised. Where the parts, 33 and 331, of the pin join it should be beveled or tapered,
as indicated at 331, to ensure an easy entrance of the pin into the notches.
The end of the pin which extends through the table is arranged to operate
a lever, 34, which carries an ejecting rod, 35, at its end opposite that with which
the pin engages. This lever is weighted or operated upon by a spring so as normally
to be in a position with the ejecting rod depressed, and out of the way of the die-
carrier; but when the reciprocating head descends, and the pin, 33, operates the
lever, the ejecting rod is lifted to throw the nut out of the die in which it has been
held.
The machine is provided with a device which pushes the nuts off the plate, 28,
after they have been removed from the holding dies. It consists of a finger 36,
which, under the action of a spring, 37, occupies a position indicated in full lines
in Fig. 2. When the reciprocating head descends, a projection, 38, engages an
arm, 39, of the finger, 36, and moves the latter into the position indicated by the
dotted lines. This sweeps the nut off the plate and into any receptacle which may
be provided to receive it.
A nut is placed in a holding die, 12, and brought beneath the reciprocating twist-
ing die. The latter is brought down until both dies are in engagement with the
nut, Full engagement of the die, 13, with the nut takes place before the recipro-
cating head completes its downward movement, so that the head finishes its stroke
without carrying with it the die and die holder, 15. This results in a partial
rotation of the die and its holder, and a twisting of the nut. The amount of twist
depends upon the inclination of the slots, 19, and the extent to which the head
moves after the twisting die has come into full engagement with the nut. On
the upward movement of the head, the plunger, 22, ejects the nut from the twisting
die. The spring, 17, restores the die to its normal position ready to engage another
nut when it again descends. As an additional means for restoring the die and its
holder, 15, to their normal positions, a spring, 27, may be employed.
While this invention is primarily intended to be used in connection with
machines for making lock-nuts, it is apparent that many of its features are
applicable to die presses or similar machines, used for other purposes.

page_text: Having now particularly described and ascertained the nature of the said
invention as communicated to; me by my foreign correspondents and in
what manner the same is to be performed, 1 declare that what I claim is:.
1. In a machine for making lock-nuts, the two dies adapted to be brought
toward each other to engage with the opposite ends of a nut, combined with
mechanism for imparting to one of the dies a partial rotation while they are in
engagement with the nut, substantially as set forth.
2. In a machine for making lock-nuts, the two dies which are adapted to be
brought toward each other to engage with the opposite ends of the nut, combined
with a mechanism for imparting to one of the dies a partial rotation while they
are in engagement with the nut, and means for adjusting the amount of such
rotation, substantially as set forth.
3. In a machine for making lock-nuts, a plurality of nut-holding dies mounted
in a common carrier, which is adapted to be intermittently moved, and brought
to rest with the dies opposite to a reciprocating, twisting die, and means for partially
rotating such twisting die when it is brought into engagement with a nut held in
one of the holding dies, substantially as set forth.
4. In a machine for making lock-nuts, the herein described nut-twisting device,
comprising a reciprocating head which carries a supporting piece, 14, a movable.
sleeve which carries a die adapted to engage with one end of a nut, supported upon
the said piece and provided with slots through which extend studs carried by the
supporting piece, a spring bearing against the said sleeve and tending to separate
it from its supporting piece, and an ejector for removing the nut from the die after
it has been twisted, substantially as set forth.
5. The herein described device for giving to a die-carrier intermittent movements
and rests, comprising the worm wheel and worm, the thread of the latter being
straight for a portion of its extent, and curved for a part of its extent, substantially
as set forth.
6. The herein described means for locking a movable die-carrier having a
notched edge, comprising a pin adapted to engage with the edge of the carrier,
and having a cut-away part which is of a length to extend past the edge of the
carrier, and also a bevelled part between the cut-away part and the part which
engages with the notches, substantially as set forth.
7. The pivoted finger, 36, for removing the nuts after they have been removed
from the holding dies, with means for operating the finger, substantially as set
forth.
T11
10.1 1
0751007
BOULT & WADE,
Agents for the Applicants.