Improvements in Machinery for Making Rivets, Bolts and Screw Blanks.
Year: 1898

page_text: Date of Application, 25th Aug., 1898-Accepted, 22nd Oct., 1898
COMPLETE SPECIFICATION.
Improvements in Machinery for Making Rivets, Bolts and
Screw Blanks.
I, GEORGES ADOLPHE NORBERT ERMEL, of No. 88, Rue Hotel des Monnaies,
Brussels, Belgium, Operative, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
-
My invention relates to improvements in the construction of machinery for
making rivets, bolts and screw blanks described in the Specification to Patent
No. 19348 of 1895, the said, improvements relating more particularly to the
carriage for feeding the rivet blanks into the machine.
I will describe my said improvements with reference to the accompanying draw-
ings which represent substantially the same construction of machine as that
described in the said Specification 19348 of 1895, those of the corresponding parts
which remain unaltered being indicated by the same letters of reference as in
the drawings to that specification.
Fig. 1 is a side view of the machine, Fig. 2 a sectional plan, Fig. 3 a back end
view Fig. 4 a cross section Figs. 5 and 6 elevation and plan of the feed carriage
detached to an enlarged scale, Figs. 7 and 8 section and plan of the gripper of
the feed carriage. Figs. 9 to 12 are views of the different positions of the gripper
during the working of the machine, and Fig. 13 is an enlarged sectional view of
a safety device for the carriage.
It will be observed that in Figs. 1 and 2 the crank shaft A, the connecting
rod C and crosshead D and parts in connection therewith are shewn in two different
positions, this being done for the purpose of shewing the action more clearly.
The machine consists of the crank shaft A driven by the driving shaft A¹
carrying fast and loose pullies and fly wheel B. The connecting rod C imparts
a to and fro motion to the crosshead D, made in two parts, of which the front
part D serves to carry the die D2 that forms the head of the rivet &c., the cross-
head being carried in guides of a strong frame E.
At
G is a connecting piece between D and D which can give way if the resistance
to the action of D2 becomes excessive; H is a regulating wedge for regulating the
position of D¹ and consequently of the die D2; K is the matrix containing the
blank to be operated upon; J is the distributing hopper for the blanks.
the rear end of the machine is the discharging apparatus, consisting of the rod I
which enters the rear end of the matrix, the diameter and extent of motion of
which is varied at will to suit the size of the rivet, and which not only serves
for expelling the headed rivet from the matrix but also as abutment while the
die D is operating. The rod I is carried in a socket on the end of the bar V
fixed to a cross-head to which are pivoted two detent levers V2 having rear
extensions acted upon by a spring forcing them apart. These levers have pro-
jections which can engage with projections won a crosshead W which is con-
nected to the crosshead D) by means of long rods F. An abutment piece is
adjustably fixed to brackets projecting from the back of the framing against

page_text: the curved surface of this piece bear the curved ends of the detent levers V2, as
these are moved forward, so that by the resulting outward movement of the levers
these release the projections w at the required moment, whereupon the cross-
head to which the levers are pivoted, and with it the bar V and rod I
are rapidly moved backward again by means of the helical springs f, which are
compressed during the forward motion of V.
The bar V has fixed upon it a sleeve and between this and the part E¹ of the
framing is provided a vertically adjustable wedge shaped abutment piece T serving
to arrest the backward motion of V, so that by adjusting the piece T by means
of a screw and wheel nut as shewn, the extent to which the rod I moves in and
out of the matrix can be regulated according to the size of the rivet. All the
above described parts are substantially the same as in the previous patent.
The feed apparatus for supplying the blanks to which my improvements more
particularly relate, is not inclined as in the said previous patent but is arranged
horizontally; it rests upon a support attached to the framing and is composed,
as in the former construction, of two parts L M capable of sliding one upon the
other, and attached together by a spring R. The lower part L receives a two
and fro movement transversely to the machine, by means of a reciprocating rod N¹
actuated by an oscillating slotted lever N that receives its motion from a crank
plate fixed on a shaft P that is driven from the shaft A through suitable
gearing Q Q.
At the front of the upper part M of the carriage is fixed the blank gripping
device proper. This is shewn separately at Figs. 7 and 8; it consists of an angular
plate ab, the wider part 6 of which has eyes b₁ thus resembling part of an ordinary
door hinge. In the eyes 61 turns freely an axis c on which are fixed one or more
blocks d constituting the second part of the hinge and having eyes that are
fixed on the axis c intermediately between the eyes b. To the parts of the axis
beyond the eyes b¹ and are fixed coiled springs ? fixed with their other ends
to the piece b by screws or otherwise, so that the springs tend to bring the part d
into the normal vertical position in which it bears against a, b, after having been
turned away from these."
Instead of helical springs suitably arranged blade springs may be used.
The pieces d have small notches in which are fixed rods g; a slot is also
formed in the piece a in order to enable it to be adjustably fixed by clamping
screws to the front part of the carriage as shewn at Figs. 5 and 6.
Above the above described gripping device for the blanks is arranged a piece k
adapted to engage with the part a, being for this purpose provided with two
parts aa, similar to a and of the same thickness, and having similar slots j¹ j', by
which it can be adjustably fixed to the upper part M of the carriage in a similar
manner to a.
A plate k¹ rests on the piece k and sliding with this under the distributing
hopper J, so as to keep its lower end closed, and thus preventing the issue of the
blanks y from the hopper except at the required moment. The piece has in
front a longitudinal angular notch, in which is held by means of the rods g the
blank to be fed into the matrix. In this improved arrangement the piece k does
not require to have at its end a notch of the form of the rivet blank, as formerly,
as the angular notch can be of a larger or smaller size than the blank, the latter
being always held securely therein by the rods 9 acted upon by the springs p.
The several parts might be made in one piece of a width corresponding at least
to the length of the rivet blanks, but it is preferably to make them separate, so
that in the case of the smallest rivet blanks a single one may effect the holding
thereof, while for larger ones two, three &c. come into action. Practically two
pieces d will be sufficient and advantageous in most cases.
d
The action of this gripping device of the feed apparatus will be readily under-
stood on reference to Figs. 9 to 12. Fig. 9 shews the position of the gripper
when empty, before being brought under the hopper J; Fig. 10 shews the gripper

page_text: when brought under the hopper at the moment when it opens to receive a blank
descending from the hopper; on then moving forward as at Fig. 11, the gripper
closes, holding the blank and bringing it in front of the matrix, while at the
same time the next blank in the hopper rests upon the plate k¹.
Figure 12 shews the gripper moving back after the blank has been introduced
into the matrix, the jaw dg being forced downwards on its axis against the
action of the springs by the protruding part of the blank, to allow of such motion.
The mechanism for actuating the carriage is generally similar to that of the
former arrangement.
The upper slide M has a vertical hole through which passes the axis of a lever
with two arms S S₁ fixed on the axis; the long arm S moves over the upper face
of slide M while the small one $1 works in a corresponding hollow in the lower
slide L. The arm S has a forked end which actuates a pin s sliding in a guide
and serving to push the rivet blank out of the gripper and into the matrix. The
short arm S is held by its rounded head t between an angular stop u fixed to
the lower slide L of the carriage, and a rod r carrying a strong spring which
serves both to assist in the introduction of the blank and to afford a yielding
abutment for preventing fracture as will be presently described.
The carriage has a to and fro motion imparted to it as above described, carrying
in its forward motion a blank into the axial line of the matrix, when the stops m
of the upper slide M in coming in contact with the adjustably fixed stops e of the
framing, arrest the motion of M; L on the other hand continues its motion and
thereby causes the short lever arm S¹ to move forward with it.
The long arm S is thus made to move the pins forward so as to push the blank
from the gripper into the matrix K.
The carriage then recedes again for seizing another blank, while the blank in
the matrix is acted upon by the die D³, and is then expelled in the manner
described in the previous patent.
For preventing fracture of the machine or of any vital part thereof in the event
of the blank resisting the proper action of the die or of a foreign body getting
between the die or matrix and the blank. I provide the lower part L of the carriage
with the special appliance shewn at Figure 13, consisting of a metal block
of suitable form bolted to the part L in which block slides freely a rod r carrying
a strong helical spring o the strength of which is regulated by a screw nut n;
the end of the rod bears against the end of the short lever arm S¹ so as to
confine this between it and the before mentioned piece u.
Thus should any resistance be offered to the proper working of the parts as above
described impeding the forward or feeding motion of the lever arm S, the short
arm S¹ can give way in forcing back the rod r and compressing the spring o,
thus preventing damage.
As will be seen from the above, the improved construction, and mainly the
spring o will effect or co-operate in effecting the introduction of the blank into
the matrix in such a yielding manner as to prevent any damage to the machine.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is:―
1. In a machine for making rivets and the like such as is herein referred to,
the improved construction of carriage with blank feeding device, consisting of two
slides L and M adapted to slide upon each other but connected by a spring R.
the lower slide L receiving a to and fro motion from an oscillating lever N actuated
by a crank on a way.shaft driven by the machine, while the,upper slide M has its
forward motion limited by stops m and e, and has pivoted to it a two-armed lever S S¹
of which S effects the forward feed of the rivet blank from between the gripper
while S is confined between a piece u fixed, to the lower slide and a rod r acted
upon by a spring o, the said parts operating for feeding the blanks into the
matrix of the machine substantially as herein described with reference to the
drawings.

page_text: 2. In combination with the blank feeding carriage referred to in the first claim,
a hinge-like blank gripping device carried by the upper slide M and composed
of a plate a b having eyes 6' carrying an axis c on which are fixed one or more
blocks dd, the axis c being acted upon by one or more springs p which tend
to bring the blocks d into the vertical position, in which rods g fixed to d to hold
the rivet blank in an angular notch of a piece k fixed to M, a plate fixed on k
serving to close the discharge opening of the hopper J except when a blank is
required to be fed into the notch of k, substantially as described with reference
to the drawings.
3. In combination with the blank feeding carriage referred to in the first claim,
a safety device consisting of a metal block / fixed to the slide L and carrying a
sliding rod on which acts a strong spring o regulated by a screw nut n which
rod confines the head t of the lever S₁ between it and a piece u also fixed to slide L,
substantially as and for the purpose herein described with reference to Figure 13
of the drawings.
Dated this 25th day of tum
1000
ABEL & IMRAY,
Agents for the Applicant.