Improvements in Carbon Holders and Screens suitable for Electric Welding.
Year: 1891

page_text: Date of Application, 1st Aug., 1891
Complete Specification Left, 30th Apr., 1892-Accepted, 30th July, 1892
PROVISIONAL SPECIFICATION.
Improvements in Carbon Holders and Screens suitable for Electric
Welding.
I, HENRY HOWARD of Coombs Wood Tube Works, Halesowen near
Birmingham, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
The carbon is held between two metallic jaws fixed to a split stem which is:
forced into the end of a metal tube thereby causing the jaws to approach each
other and hold the carbon firmly and at the same time make a good electrical.
connection with the tube.
The wires leading the current to the carbon are connected to the other end of
the tube in the following manner: the tube is provided with a perforated cap.
which screws on to it and having inside a cone whose point enters the tube. The
conductor passes through the hole in the top of the cap and the wires are spread
around the base of the cone their ends being inserted into the tube so that
when the cap is screwed up the cone forces the wires into close contact with the
inside edge of the tube.
•
Part of the tube is surrounded by a handle of wood or other insulating material.
I fix a screen to the carbon holder providing a small window or windows of
coloured glass in the screen so that the workman can see the work without being
unduly exposed to the light and heat of the arc. The side of the screen next to.
the arc should be covered with some uninflammable material which is a bad
conductor of heat, preferably I employ asbestos card. The other face of the screen.
may be of metal to support and give stiffness to the card, but in this case it should
be insulated from the carbon holder, otherwise, if the screen accidentally touches.
any conductor, an electric arc is set up.
In order to afford additional protection to the eyes of the workman I sometimes.
interpose between the coloured glass screen and the arc a small bar of opaque.
material placed at a short distance from the carbon and moving with it. The
work heated is, therefore constantly within view of the eye of the workman whilst
the arc is concealed by the bar.
Where the work is of such a character that the welding is done at approximately
the same place I do not carry the screen upon the carbon holder but fix it
between the face of the operator and the work making the side next to him a
reflector so that he views the work not directly but after reflection in the mirror
and a second mirror placed behind him.
Dated this 1st day of August 1801
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Carbon Holders and Screens suitable for Electric:
Welding.
1, HENRY HOWARD, of Coombs Wood Tube Works, Halesowen, near
Birmingham, Manufacturer, 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 :-
The carbon is held between two metallic jaws fixed to a split stem which is .
forced into the end of a metal tube thereby causing the jaws to approach each

page_text: other and hold the carbon firmly and at the same time make a good electrical
connection with the tube.
The wires leading the current to the carbon are connected to the other end of
the tube in the following manner: the tube is provided with a perforated cap
which screws on to it and having inside a cone whose point enters the tube. The
conductor passes through the hole in the top of the cap and the wires are spread
around the base of the cone their ends being inserted into the tube so that when
the cap is screwed up the cone forces the wires into close contact with the inside
edge of the tube.
Part of the tube is surrounded by a handle of wood or other insulating material.
I fix a screen to the carbon holder providing a small window or windows of
coloured glass in the screen so that the workman can see the work without being
unduly exposed to the light and heat of the arc. The side of the screen next to
the arc should be covered with some uninflammable material which is a bad
conductor of heat, preferably I employ asbestos card. The other face of the screen
may be of metal to support and give stiffness to the card, but in this case it should
be insulated from the carbon holder, otherwise, if the screen accidentally touches
any conductor, an electric arc is set up.
In order to afford additional protection to the eyes of the workman I sometimes
interpose between the coloured glass screen and the arc a small bar of opaque
material placed at a short distance from the carbon and moving with it. The work
heated is therefore constantly within view of the eye of the workman whilst the
arc is concealed by the bar.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan partly in section and Figure 2 is a front elevation of the
hand apparatus. Figure 3 is a side elevation partly in section and Figure 4 is a
front elevation of the apparatus adapted to a mechanically operated carbon.
In all these figures A is the conductor leading to the pencil holder which
consists of a tube B with the perforated cap C screwing onto it and the cone D
whose point enters the tube forcing the wires of the conductor into contact with
it. E (Figures 1 and 2) is a wooden handle surrounding the tube and F is a metal
guard to protect the workman's hand. G is the carbon pencil held in the metal
jaws H fixed on the split stem O' which is forced into the end of the tube.
screen carried by the bracket K. It consists of a frame having at the centre a
window K' of coloured glass. Between this glass and the pencil is a bar L hiding
the arc from the workman but allowing him to see through the coloured glass the
heated work on each side of it.
J is a
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 1
claim is
1. In carbon holders the combination of a support for the carbon, a screen of
coloured glass carried by the support and an opaque bar interposed between the
carbon and the screen.
2. In carbon holders the combination of a tube, a cap screwing onto one end of
the tube, a split clip embracing the carbon and forced into the other end of the
tube, a cone within the cap and adapted when the cap is screwed on to force the
wires of the conductor into close contact with the tube.
3. Apparatus substantially as described and shown in the drawings.
.
HENRY HOWARD.