Year: 1888

page_text: 1, FRIEDRICH PASTOR, of Cologne, in the German Empire, Macro, poreby
declare the nature of this invention to be as follows:-
According to my invention I construct a machine for forging bolt heads as
follows.
The end of the bolt-blank to be operated upon is held vertically under a hammer
or swaging lever between a cheek fixed to the framing and a sliding cheek pressed
against the bolt by a hand lever. The hammer shaft is pivotted to the end of the
framing and receives a vertical up and down motion from a crank on the driving
shaft by means of a connecting rod. The hammer head contains a horizontal slide
carrying two dies, one of which has a coned recess so that on being brought down
upon the projecting end of the bolt-blank, it imparts to it the form of a conical
head. On the hammer then rising, the slide is moved by a lever actuated by a cam
on the driving shaft so as to bring the second die over the blank, while at the same
time lateral dies are brought against the sides thereof, so that on such second die
descending with a flat face upon the partially formed head, it spreads this out so as to
assume the form of the lateral dies. The bolt-head being completed, the holding
cheeks are released so as to allow the bolt to fall out and the slide of the hammer is
pushed back by hand so as to repeat the operation upon the next blank. The lateral
dies are arranged and operate as follows:-
There are four dies for acting separately on the four sides of the head, each die
being carried by a slide that slides to and fro in a radial direction relatively to the
bolt. On two opposite sides of these dies are two double ended levers formed with
elbows mounted to rock on strong pins on the framing, which levers are respectively
connected by adjustable links at equal distances on each side of the fulcrum to two of
the slides carrying the dies; these levers have tails that are connected together by a
link and they are acted upon by cams on the driving shaft, whereby a rocking motion
is simultaneously imparted to both.

page_text: By the one motion of the levers two opposite dies are simultaneously made to
advance to form the corresponding two side faces of the bolt-head, and the other two
dies are made to recede; on the return motion of the levers, the first named dies are
made to recede and the other opposite pair is made to advance, these consecutive
operations being effected while the top of the head is at the same time subjected to
the blows of the vertically moving die on the hammer.
The driving shaft has a driving pulley mounted loose upon it but made to gear
therewith by means of a clutch which is put in gear by means of a treadle acting
on a toggle joint, and is drawn out of gear by a weight on releasing the treadle.
Dated this 7th day of March 1888.
ABEL & IMRAY,
Agents for the Applicant.

page_text: I, FRIEDRICH PASTOR, machine manufacturer of 17 Rosenstrasse, Cologne on the
Rhine, Germany 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 :-
Fig. 1 is a longitudinal section, fig. 2 a vertical cross section and fig. 4 is a top
view of my improved machine. Fig. 3 shows, on a larger scale, a partially finished
bolt head.
The bolt a upon which a head is to be formed is held between a stationary jaw c
and a movable jaw b secured to a slide; d is a hand lever for bringing the movable
jaw b against the stationary jaw c. The portion of the bolt out of which the head is
to be formed projects above the jaws c, b. The formation of the head of the bolt is
effected by first forcing back the metal into a conical or preliminary shape, as shown
in fig. 3. The said forcing back is effected by means of the lever e which receives an
At its outer end, the
up and down motion from a crank f and a connecting rod g.
lever e has a carriage h carrying two stamping dies i and k. The front die i is for
forcing back the metal.
After the first downward motion of the lever e, the metal is driven back into the
shape shown in fig. 3; thereupon, the elbow l m which is operated by a cam on
the periphery of a disc n, moves the carriage forwards, so as to bring the stamping
die k having an even surface, above and in a line with the partially formed bolt head.
The continued formation of the upper surface of the bolt head is then effected by the
flat die k, whilst at the same time, the sides of the head are formed by means of
horizontal dies o, o and p, p. Two oppositely situated horizontal dies are moved
towards each other alternately. The vertical die k reaches the upper face of the bolt
head, when the horizontal dies are in the middle position.
The horizontal dies are secured to carriages y by means of plates g; the carriages y
are operated from elbow levers r, r¹ and s, s¹. Short rods having spherical joints
connect the carriages y with the elbow levers r, 2 and s, s². Fig. 5 and 6 are a
longitudinal and a cross section of the carriages.
The requisite motion is imparted to the elbow levers r, r¹ and s, s² from cams on the
both disks n, n¹.
According to whether the bolt is more or less heated, the completion of the head
will require one or more revolutions of the crank shaft.
The rotary motion necessary to the driving shaft for operating the machine is
derived from a pulley t and friction cones u and ¹ of which one forms part of the
pulley t and the other is secured on the crank shaft. By depressing a foot lever v,
two jointed levers w, w are raised so as to cause an engagement of the friction cones,
whereby the machine is started. As soon as the foot is removed from the lever v, a
weight moves the levers w w downwards and causes the friction cones u, u¹ to
separate and the machine stops.

page_text: The carriage with its two dies i and k is then brought back by hand into its first
position, so as to be in the requisite position for forcing back the metal of the following
bolt.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
A machine for forging bolt-heads, comprising simultaneously the following
devices:
First. The dies i and k secured on a carriage h adapted to the outer end of the
operating lever e, of which one die i is for driving back, into the shape of a cone,
the portion of the bolt intended to form the head, whilst the other die k is intended
to complete the upper face of the head, both dies fulfilling their purpose successively
by an automatic displacement of the carriage h.
Second. The elbow levers s, s¹ and r, connected to each other, which are so
operated that as long as the cam of the disc n acts upon the elbow lever s, s¹, both
opposite dies o, o are moved towards each other and both dies p, p are moved away
from each other, whilst the movement of the pairs of dies in a reverse direction is
effected from the cam of the disk n', the employment of springs for actuating the
dies being thus avoided.
Dated this 7th day of December 1888
FRIEDRICH PASTOR,
Per L. W.