IMPROVEMENTS IN BENDING OR SHAPING BLANKS FOR CHAIN LINKS AND THE LIKE, AND IN MACHINERY THEREFOR
Year: 1883

page_text: LETTERS PATENT to Friedrich Carl Glaser of Berlin in the Kingdom of
Prussia and Empire of Germany, Engineer and Patent Solicitor for an
Invention of "IMPROVEMENTS IN BENDING OR SHAPING BLANKS FOR CHAIN
LINKS AND THE LIKE, AND IN MACHINERY THEREFOR." Communicated to
COMPLETE SPECIFICATION filed by the said Friedrich Carl Glaser at the
Office of the Commissioners of Patents on the 17th July 1883.
FRIEDRICH CARL GLASER of Berlin in the Kingdom of Prussia and Empire of
BENDING
"IMPROVEMENTS IN
Germany, Engineer and Patent Solicitor
THE LIKE,
IN MACHINERY
SHAPING BLANKS FOR CHAIN
"
LINKS AND
AND
OR
THEREFOR communicated to me by Wilhelm Hegenscheidt residing at Gleiwitz
in the German Empire.
This Invention relates to the manufacture of stamped chain links and similar
articles by means of a special construction of cam-press, the construction of which
will be understood on reference to the accompanying Drawings. According to this
invention, the blanks for the links, such as shewn at Fig. 11, are first bent by the
combined action of stamping dies, a mandril, and pushers, into the form shewn at
Fig. 12, after which the ends are bent over as at Figs. 13 and 14. The blanks
thus shaped can then be readily linked together before the joints are welded up.
Fig. 1 of the Drawings shews a side elevation of the machine for effecting the
above operation, Fig. 2 shews an end elevation, Fig. 3 a sectional plan, and Figs. 4
to 14 enlarged details.
a and b are two stamps or dies actuated by cams on the driving shaft, the
stamp a being made to pass through b as shewn more clearly at Fig. 4, so that the
latter serves as guide to the former, the stamp b being guided by the framing.
The cam for a is so formed that the stamp remains in its lowest position during
one half of a revolution of the shaft, while during the other half revolution, the
stamp rises and remains in its highest position. The stamp 6 moves downwards

page_text: when the stamp a has reached its lowest position. Both stamps or dies are formed
with recesses, that of a being made to correspond in form with one half of the
central space of a chain link, while that of b has a configuration corresponding to
the outer form of half a link. Below the stamps or dies a, b, is a slide c working
in guides on. the frame and moved to and fro by a lever and toothed segment. In
this slide is fixed, by means of a screw, a matrix composed of the parts c c¹, shewn
at Figs. 2, 6, 9, and 10, having firstly a recess for the half of a link, and secondly,
a recess for a mandril f, g Figs 5 and 10, projecting into the matrix, to be presently
described.
On the surface of the slide at the middle thereof, are two lugs n n, situated at a
right angle to its direction of motion, and serving to hold the blank accurately in
the middle of the matrix, as at Figs. 1 and 5. Opposite the slide e is a slide i
actuated by the elbow lever Z rod E and cam P. In the slot of the part K of
this slide works a carriage carrying the mandril f g and capable of being moved
up and down with the latter. This carriage (and its mandril are connected with
the slide by means of the rods rrrrforming a parallel motion so that by
a pressure from above they will descend in a parallel manner. The helical spring s
tends to keep the mandril in the highest position; on the descent of the mandril
it places itself with its inner end (which has a configuration corresponding to the
inner periphery of a link) in the above mentioned recess of the matrix. Two
pushers are moved to and fro at right angles to the motion of the slide e, by
means of elbow levers oo and rod m actuated by cam on the driving shaft, the
pushers being made to advance simultaneously rapidly to the middle of the matrix,
just before the stamp a has completed its downward motion, and then recede to
their outward position again.
The press operates as follows: the highest position of the mandril f g is so
regulated that the blank can be conveniently introduced beneath it into its position
between the lugs n n on the matrix, as at Fig. 5. The stamp a then presses the
mandril'fg downwards, whereby this is made to force the blank into the recess in
the matrix corresponding to the half link, the ends of the blank being thereby
bent upwards somewhat. The pushers ? ? now advance rapidly and bend up the
ends of the blank to a vertical position, as at Figs. 7, 8 and 12, and on the descent
of the stamp b the two ends are bent over to a shape corresponding to that of the
recess of b and of the top of mandril ƒ g, the ends so formed being situated on each
side of the obliquely placed die a, as shewn at Figs 9, 13 and 14. At the same
time that the stamps a and b commence their upward motion the mandril f g is
also withdrawn by the slide i, being caused by the spring s to resume its former
position. The slide e with the matrix is then withdrawn by means of the lever h,
and the bent link is removed to have its joint welded up after it has been linked
together with other links. The slide e is then again advanced and a new blank
inserted, after which the above operations are repeated.
When using the machine for making rings, the part that depresses the mandril ƒ g
is attached to the outer stamp and the forming die is attached to or formed on the
inner stamp. In this case also, the one pusher moves a little in advance of the
other, and the descent of the two stamps takes place in the reverse order to that
above described.
Having thus described the nature of this invention and in what manner the
same is to be performed as communicated to me by my correspondent, I claim :-
First. The herein described method of bending blanks for chain links into the
form shewn at Figs. 13 and 14 of the drawings, whereby the links are enabled to
be readily linked together before their joints are welded up.
Second. The construction of machinery for bending blanks for chain links and
the like into shape, wherein a stamp or die a of rectangular cross section passes
through a second stamp or die 6 and is so placed that its horizontal longitudinal
axis forms an angle with the axis of the driving shaft, substantially as and for the
purposes herein described with reference to the accompanying drawings.
Third. In machinery for bending blanks for chain links and the like, the use of

page_text: a moveable slide e carrying a matrix cc 1 having recesses for the half of a link
and operating in combination with a mandril fg, substantially as herein described
with reference to the accompanying Drawings.
Fourth. In machinery for bending blanks for chain links and the like, the use
of a slide i, with mandril f g, guided by a parallel motion rrrr, substantially as
herein described with reference to the accompanying drawings
Fifth. The use in combination with the slide e with matrix c c¹ and slide ȧ with
mandril 9 of the pushers p p, arranged and operating substantially as herein
described with reference to the accompanying Drawings.
In witness whereof I the said Friedrich Carl Glaser have hereunto set my hand
and seal this fourteenth day of July in the year of our Lord One thousand eight
hundred and eighty-three.
FRIEDRICH CARL GLASER (L.S.)