Improvements in or relating to Machines for Electrically Welding Metals.
Year: 1893

page_text: Date of Application, 11th Apr., 1893
Complete Specification Left, 18th Apr., 1893-Accepted, 8th July, 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to Machines for Electrically Welding
Metals.
A communication by CHARLES L. COFFIN, of Detroit, in the County of Wayne
and State of Michigan, United States of America, Chemist.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster, and 323, High Holborn, in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
This invention relates to an improved machine for electrically welding metals.
The table is supported on suitable legs. The yoke is provided with dove-tail
lugs which slide in dove-tail grooves in the table. Two clamps are each held in
a way in the yoke so as to be capable of motion in and across said yoke. Two
brackets are bolted to the clamps, and extend downward, and at their lower end
have screw-threaded holes, in which lies a shaft which is screw-threaded at each
end, one end having a right hand and the other a left hand screw-thread. A
grooved collar is rigidly secured on the shaft, and there is a lug on the bottom
of the table, whose lower edge projects into the groove on collar and prevents
shaft from shifting endwise, while permitting it to move freely with the movements
of yoke. The furnace is made of two boxes lined with refractory material,
adapted to close together and provided on their sides adjacent to clamps with
openings to permit the insertion of the articles to be heated. A double cam or
lever is rigidly secured to a shaft journaled in the frame of the machine, and a
counterweighted lever is also secured to said shaft, by which the double lever or
cam can be actuated. A rod plays through an opening in the table, one end of
which rests on one end of the cam or lever, while the other end engages with the
lower half of the furnace, and is preferably provided with a spring buffer to guard
against shock. Another rod passes through the table; also passing through the
head of a bracket which is secured to said table in rear of said furnace. One end
of the rod rests upon the other end of the cam or lever, while the other end is
connected by means of a crosshead and pin with the upper half of the furnace, and
moves said upper half of the furnace up and down when the rod is raised or
lowered. The lower ends of four guide rods are secured in the upper half of the
furnace, while their upper ends work through holes in the head of a bracket, thus
guiding the upper half of the furnace in its movement. Guide rods are secured in
the half of the furnace by means of lugs, whose outer ends are held in position by
means of heads which are secured to and carried on said rods. The lower ends of
the two carbon holders form nuts, one of which is tapped with a right hand screw
thread, while the other is tapped with a left-hand screw thread, to engage with
screw threads on the shaft, said screw threads being of different pitch, and both
nuts are bored to fit and slide on guide rods. A shaft is journaled in said head
and lugs, lying between said guide rods and provided at one end with a hand wheel.
The ends of shaft outside of the lugs are right and left hand screw threaded, the
pitch of one of said screw threads being about double that of the other, so that
when, by rotation of said shaft, the nuts are moved, the motion of one of said nuts
will be faster than the motion of the other, so that one of the carbon holders carried
on said nuts will advance faster than the other to compensate for the greater
rapidity of combustion of the positive carbon. Two carbons are carried in the
carbon holders and project into the lower half of the furnace, the whole mechanism

page_text: last described, and which is the arc regulating mechanism, being carried on the
lower half of the furnace, so that it is free to move with said lower half, if necessary,
without affecting any other part of the machine.
The carbons are connected in any suitable manner with a generator of electricity
for the purpose of maintaining a voltaic arc within the furnace. A bell-crank
lever is pivoted on the frame of the machine, one of whose ends engages with yoke,
whereby said yoke may be moved forward or back.
'
In the operation of this machine, the articles to be welded are secured in clamps,
the two parts of the furnace separated, and the article then pressed into the furnace
and the two parts of the furnace closed together, the opening and closing of said
furnace being accomplished by means of lever, double cam and the rods. A current
is now passed through the carbons, and said carbons are brought into contact by
means of the shafts and hand wheel, then separated to establish a voltaic arc within
the furnace, by means of which the articles to be welded are rapidly heated, and,
when brought to a welding heat, are pressed together by rotating shaft in such a
direction as to force the two clamps toward each other. The articles may be then
taken out of the furnace and the weld completed, or the article or articles worked
in any desired manner.
Dated this 10th day of April 1893.
WM. P. THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Machines for Electrically Welding
Metals.
A communication by CHARLES L. COFFIN, of Detroit, in the County of Wayne
and State of Michigan, United States of America, Chemist.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster, and 323, High Holborn, in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :---
This invention relates to an improved machine for electrically welding metals,
hereinafter fully described and claimed.
Figures 1 and 2 are perspectives of the complete machine ;
Figure 3 is a side elevation with the table in section and one clamp in position;
and
Figure 4 is a perspective of the arc regulating device, and one-half of the
furnace.
A represents a table supported on suitable legs. B represents a yoke which is
provided with dove-tail lugs which slide in dove-tail grooves in table A, as clearly
shown in Figures 1 and 2. C C' represent two clamps, each of which is held in a
way in yoke B so as to be capable of motion in and across said yoke.
S and S¹ represent two brackets which are bolted to clamps C and C' respectively,
and which. extend downward and at their lower end have screw-threaded holes, in
which lies a shaft P which is screw-threaded at each end, one end having a right
hand and the other a left hand screw-thread. Qrepresents a grooved collar rigidly
secured on shaft P, and R represents a lug on the bottom of table A, whose lower
edge projects into the groove on collar Q, and prevents shaft P from shifting end-
wise, while permitting it to move freely with the movements of yoke B.
F and F represent two parts of a furnace, being two boxes of, or lined with,
refractory material adapted to close together, and provided on their sides adjacent
to clamps C C with openings as shown in Figure 1, to permit the insertion of the
articles to be heated. V represents a double cam or lever which is: rigidly, secured

page_text: to a shaft T journaled in the frame of the machine, and M represents a counter-
weighted lever also secured to said shaft T, by which the double lever or
cam V can be actuated. f' represents a rod playing through an opening in
table A, one end of which rests on one end of cam or lever V, while the other end
engages with the lower half F' of the furnace, and is preferably provided with a
spring buffers to guard against shock. K represents another rod passing through
table A; and also passing through the head of a bracket H which is secured to
said table in rear of said furnace. One end of rod K rests upon the other end of
cam or lever V, while the other end is connected by means of a cross-head and
pin J with the upper half F of the furnace and moves said upper half of the
furnace up and down when rod K is raised or lowered. k represents four guide
rods, whose lower ends are secured in the upper half F of the furnace, while their
upper ends work through holes in the head of bracket H, thus guiding the upper
half F of the furnace in its movement. 99, Figure 4, represent guide rods which
are secured in the half F¹ of the furnace by means of lugs J J and whose outer
ends are held in position by means of heads h h' which are secured to and carried
on said rods y g¹. E E' represent two carbon holders, whose lower ends form
nuts e e, one of which is tapped with a right hand screw thread, while the
other is tapped with a left-hand screw thread, to engage with screw threads on
shaft W, said screw threads being of different pitch, and both nuts e el are
bored to fit and slide on guide rods g g'. W represents a shaft journaled in
said head hand lugs J J', lying between said guide rods g g', and provided
at one end with a hand wheel G. The ends of shaft W outside of lugs J J are
right and left hand screw threaded, the pitch of one of said screw threads being
about double that of the other, so that when by rotation of said shaft the nuts e e¹
are moved, the motion of one of said nuts will be faster than the motion of the
other, so that one of the carbon holders E E' carried on said nuts e e¹ will
advance faster than the other to compensate for the greater rapidity of combustion
of the positive carbon. D D¹ represent two carbons carried in the carbon
holders EE', and projecting into the lower half F¹ of the furnace, the whole
mechanism last described and which is the arc regulating mechanism, being
carried on the lower half F¹ of the furnace, so that it is free to move with said
lower half if necessary, without affecting any other part of the machine.
The carbons D D' are to be connected in any suitable manner with a generator
of electricity, (not shown) for the purpose of maintaining a voltaic arc within
the furnace FF. L represents a bell-crank lever pivoted on the frame of the
machine, one of whose ends engages with yoke B, whereby said yoke may be moved
forward or back.
In the operation of this machine, the articles to be welded are secured in
clamps C C¹, the two parts F F of the furnace separated, and the article then
pressed into the furnace and the two parts of the furnace closed together, the
opening and closing of said furnace being accomplished by means of lever M,
double cam V and the rods f¹ and K. A current is now passed through the
carbons D and D', and said carbons are brought into contact by means of the
shafts W and hand wheel G, then separated to establish a voltaic arc within
the furnace by means of which the articles to be welded are rapidly heated, and
when brought to a welding heat are pressed together by rotating shaft P in such a
direction as to force the two clamps C' toward each other. The articles may be
then taken out of the furnace and the weld completed, or the article or articles
worked in any desired manner.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. In a machine for electrically heating metal, a support, a yoke movably
mounted on said support, a furnace lying in the opening of said yoke, two slides
mounted on ends of said yoke and movable thereon across the path of motion of

page_text: said yoke, clamps mounted on said slides and a right and left threaded screw shaft
connecting said slides, substantially as shown and described.
2. In a machine for electrically heating metal, a separable furnace consisting of
a two part box, a rock shaft supporting one part of the furnace, and a cam on said
rock-shaft for opening and closing said furnace, substantially as shown and
described.
Dated this 17th dor of A1 1000
WM. P. THOMPSON & Co.,
Agents for the Applicant.