Improved Dies for Chain-welding Machines.
Year: 1899

page_text: Date of Application, 9th May, 1899-Accepted, 1st July, 1899
COMPLETE SPECIFICATION.
Improved Dies for Chain-welding Machines.
I, HEINRICH SPÜHL, of St. Gallen, in the Confederation of Switzerland,
Engineer, do hereby declare the nature of this invention, and in what manner
he same is to be performed, to be particularly described and ascertained in and
by the following statement:-
The present invention relates to an improvement in welding swages for chain
links by means of which my chain-welding machine forming the object of my
Letters Patent No. 4367/1898 can be employed for welding the chain links at
their curved parts whilst in the forecited application the links only could be
welded at the sides. In the forecited machine the swage is provided with a cam
for the purpose to adjust the ends of the link before the welding; further
arrangements are made that the chain being in welding heat cannot come into
contact with its swage, thus the premature cooling of the heated ends of the
links being prevented.
In order to attain the purpose of welding the links at their curved parts, use of
a swage of special form is made.
The object of my invention is clearly represented in the accompanying draw-
ing, in which:
Figure 1 illustrates a front view of the upper swage,
Figure 2 is a section through of Figure 1,
Figure 3 is a section through the upper and lower swage during the welding
process.
Figure 4 is a detail front view of the lower swage,
Figure 5 is a section through the lower swage supporting a chain-link to
be welded,
Figure 6 is a section through the middle portion of the upper swage.
Figure 7 is a back view of the upper swage,
Figure 8 is a top view of the lower,swage, with a chain link.
Figure 9 is a horizontal section through y-y of Figure 3, showing the dis-
position of the chain,
Figure 9 is a corresponding view of a modified construction of the lower
swage,
Figure 10 illustrates a plate by means of which the upper swage is fixed to the
hammer head.
The upper swage a, (Figures 1-3, 6 & 7) is provided with a cam 6 having a
curved surface 61 in form corresponding to the curve of the chain-links (in the
example represented being semicircular). The surface has a block 6 tapered to
the outside. A prismatic projection engages into a groove provided within
a plate e fixed in the hammer-head. The upper swage a is provided with a
recess a², the block of which a³ corresponds to the form of the chain-link to be
O welded, that is to say, semicircular at the point of welding whereas the remain-
ing portion is of a flat shape (Figure 7). The semicircular part of the block a
forms a round swage and the flat portion ensures that only the place of
weld can be hit by the hammer.
The lower swage d³ (Figures 4, 5, 8 & 9) is provided with a recess
corre-

page_text: sponding in form and size to the section of the cam 6 of the upper swage
(Figure 8). The lower swage has, a semicircular swage corresponding in
form to the upper swage. Furthermore the lower swage is provided with a
block in form corresponding. to the inner space of the chain link c. This
block at its front side is provided with a groove taking up the last welded
chain-link.
The block is conical and takes up the link to be welded and owing to its
conical form prevents the link from coming into contact with the swage before
the blow is effected.
The welding of links is effected in the following manner:
The U-shaped link after having received its shape illustrated in Figures 5 & 8
is laid into the groove. The place. of weld comes to lie upon the round swage.
When now the hammer head with the upper swage a descends, the cam benters
the recess of the lower swage and owing to its semicircular surface 62 presses
the ends to be welded of the link against the holt d, so that these ends come to
lie exactly one above the other. The upper round swage c¹ effects the blow upon
the ends of the links, whereby the same are welded and adopt the form of the
round swages. The inner curved surface of the cam secures the right position
of the ends to be welded and prevents the premature cooling of the same.
upper swage a easily can be interchanged by means of the plate c.
The
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
In a chain welding machine, the combination with an upper swage, a cam
fixed to this upper swage and having a curved surface in form corresponding to
the links to be welded, for the purpose to secure a right position of the ends of
the links within the lower swage, substantially and for the purpose as described.
Dated this 9th day of May 1899
J. P. BAYLY,
18, Fulham Place, London, W.,
Agent for the Applicant.