IM- PROVEMENTS IN THE CONSTRUCTION OF PARTS OF ELECTRIC TELEGRAPH BELL APPARATUS, AND IN APPARATUS USED IN MAKING THE SAME
Year: 1861

page_text: LETTERS PATENT to William Clark, of 53, Chancery Lane, in the County
of Middlesex, Engineer & Patent Agent, for the Invention of "IM-
PROVEMENTS IN THE CONSTRUCTION OF PARTS OF ELECTRIC TELEGRAPH BELL
APPARATUS, AND IN APPARATUS USED IN MAKING THE SAME."- A communica-
tion from abroad by Mr. Pierre Désiré Prud'homme, of 29, Boulevart St.
of Tronics Mechanicion
PROVISIONAL SPECIFICATION left by the said William Clark at the
Office of the Commissioners of Patents, with his Petition, on the 27th
November 1861.
.
I, WILLIAM CLARK, of 53; Chancery Lane, in the County of Middlesex,
5-Engineer & Patent Agent, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE CONSTRUCTION OF PARTS OF ELECTRIC TELEGRAPH
BELL APPARATUS, AND IN APPARATUS USED IN MAKING THE SAME," to be as
follows:-
This Invention relates to one of the principal parts of electrical signal bell
O apparatus, the electro-magnet, of which is ordinarily formed of a piece of soft
iron, having a spring at one end, which is received in a mortise formed in one
end of the soft iron, while the stem of the hammer or striker is screwed into
the other end. This Invention 'consists of an improved construction of said piece
of soft iron which I form, out of a piece of sheet iron suitably shaped and
5 doubled to a V form in its tranverse section. In the space between the

page_text: two branches of the V-shaped piece of metal I fix a rod by the blow of a
suitable "set" or former, the enclosed end of the rod received into the metal
being squared, to the other end I attach a spring also by pressure applied so
that it nips the extremity of the spring. For this purpose I employ certain
instruments of this Invention as far as relates to their application for the above
purpose, which consist, 1st, of an instrument for cutting and shaping the
metal; 2ndly, a folder or doubler of said metal, and 3rdly, a flattener for
uniting by pressure the two parts consisting of the stem and spring with the
soft piece of metal.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Clark in the Great Seal Patent Office on the 26th
May 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
CLARK, of 53, Chancery Lane, in the County of Middlesex, Engineer and
Patent Agent, send greeting..
WHEREAS Her most. Excellent Majesty: Queen Victoria, by Her Letters
Patent, bearing date the Twenty-seventh day of November, in the year of our
Lord One thousand eight hundred and sixty-one, in the twenty-fifth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said William Clark, Her special licence that I, the said William
Clark, my executors, administrators, and assigns, or such others as I, the
said William Clark, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for "Iм-
PROVEMENTS IN THE CONSTRUCTION OF PARTS OF ELECTRIC TELEGRAPH BELL
APPARATUS AND IN-APPARATUS: USED IN MAKING THE SAME," a com" from Mr.
Pierre Desiré Prudhomme, of 29, Boulevart St. Martin, Paris, in the
Empire of France, Mechanician, upon the condition (amongst others)
that I, the said William Clark, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said Inven-
tion, and in what manner the same was to be performed, and cause the
same to be filed in the Great Seal Patent Office within six calendar montlis-
next and immediately after the date of the said Letters Patent,

page_text: NOW KNOW YE, that I, the said William Clark, do hereby declare the
nature of the said Invention, and in what manner the same is to be.per-
formed, to be particularly described and ascertained in and by the following
statement, reference being had to the Sheet of Drawings hereunto.annexed,
and to the letters and figures marked thereon (that is to say)':
This Invention relates. to improvements in the manufacture of certain parts
of electric bell apparatus. It consists of the armature of the electro-magnet
carrying at one of its extremities the hammer which acts on the bell. In
ordinary apparatus this part of the electro-magnet is composed of three
different parts; 1st, the armature properly so called attracted by the magnet';
2ndly, a metallic rod, one of whose extremities is screwed and enters
the armature, the other carries a hammer; 3rdly, a steel blade connected at
one end with the armature by the aid of a groove made in the latter. This
steel blade forms,a spring, which has for its object to permit of the oscillating
movements of the whole armature consequent on the action of the current.
2
From the above it will be easily seen that the manufacture of the parts
is costly and requires much time as compared with their simplicity.
The improvements in this manufacture consist in making the whole
mechanically and dispensing with the screw cutting and tapping necessary,
and I thus produce a speedy, and economical manufacture. To produce this
effect I use three tools; 1st, a punch to cut out pieces of sheet iron equal
in length to the armature desired, and double, the width; 2ndly, a stamper to
bend the plates to a V form in transverse section; 3rdly, a compresser.
for securing between the two bent parts a strip of steel and, the staff of the
hammer.
In the annexed Drawing, I have represented the tools above described;
Fig. 1 shows the interior of an electric bell apparatus representing the gear of
the armature; Fig. 2 shows a vertical elevation of the punching tool; Fig. 3
shows a plan in section of the same on line 1, 2; Fig. 4 shows. a vertical
section of the stamper, in line 3, 4, Fig. 5; Fig. 5 shows a plan of the stamper;
Fig. 6 shows a side view of the stamper so called; Fig. 7 shows a vertical
section of the compressor acting on the whole of the armature on line 5, 6,
Fig. 8; Fig. 8 shows a plan of the compresser; Fig. 9 shows the armature
complete, made according to the system of this Invention.
In the different Figures the same letters represent the same parts seen in
different positions.
Cutting instruments, Figs. 2 & 3.-A cutting punch or stamp fixed on the
screw. of a balance or other press b;. metallic block or bed pierced with an.
opening corresponding to the stamp and acting as a guide; c first opening

page_text: -
made in the bed b, in which is introduced the sheet of iron to be cut; d
second opening in bed b receiving the punch a. It is through this opening
the cut plates fall; e, stop' fixed on the block b, it serves to secure the plates
of iron in the opening 'c for cutting.
Stamping tool, Figs. 4, 5, & 6.-f, metal block in which are made the
necessary cavities for the purpose of bending and forming the plate; g, first
cavity made in the block f, it receives the plate of iron, and consequently
is of an equal size to it; 7, second opening made in the middle of the first
g passing through the block f. This opening serves for the passage of the
bent plate; i, stamping punch fixed on the screw of a balance or other press
and by pressure causing the platej to enter the cavity,. & bending it double;
k, vertical grooves serving as guides to the stamping or shaping punch i.
Compressing tool, Figs. 7 & 8.-1, metallic block in which are made the
cavities necessary to effect the junction of the three parts of the armature;
m, cavity made in the block 1, it serves to receive the bent piece; n; first
table acting as guide to the strip of steel o, for holding it between the two
sides of the bent part j, forming the armature properly so called; p, second
table serving as guide to the rod g of the hammer for securing it between the
sides of the bent piece j; r, compressing punch for gripping the pieces o
and q between the two parts of the armature j. After these operations an
armature is obtained as represented at Fig. 9.
Having described the nature of this Invention, and the manner of performing
the same, I declare that what I claim as the Invention to be protected by the
herein-before in part recited Letters Patent is forming and combining the
parts constituting the armature of electric bell telegraph apparatus as above
described, as also the several tools, above described (cutter, stamper, and
compresser), as applied to such manufacture.
In witness whereof, I; the said William Clark, have hereunto set my
hand and seal, this Twenty-fourth day of May, in the year of our Lord
One thousand eight hundred and sixty-two.
Witness,
W. G. E. SWINNOCK,
53, Chancery Lane, London.
W. CLARK.--(Ļ.S.)