Improvements in or connected with Electric Arc Lamps.
Year: 1899

page_text: Improvements in or connected with Electric Arc Lamps.
I, WILLIAM JAMES DAVY, of 27, Drayton Park, Highbury, in the County of
London, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention for improvements in or connected with electric arc lamps has
for its object to provide improved carbon holders that shall ensure an efficient
electrical connection. The carbon holder for the movable carbon consists of a
split metal cylinder forming an annular series of spring tongues which grip the
carbon, and to it are riveted springs that pass upward and bear against the
internal surface of the guide tube. In order still further to ensure the passage
of the current to the upper carbon, a copper roller mounted on a link pivoted
inside the mechanism bears on the carbon or, when the feed mechanism is
raised on the arc being struck, on the feed mechanism.
The fixed carbon holder is in a similar way split to form spring jaws and its
exterior surface is tapered. A tapered bush fits on the tapered jaws and has a pin
passing through the slits. To insert a carbon the bush is raised to allow the
jaws to spring outwards; the carbon is then forced downwards and by means of
the pin forces down the bush and closes the jaws on itself.
Dated this 4th day of March 1899.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
Improvements in or connected with Electric Arc Lamps.
I, WILLIAM JAMES DAVY, of 52, Durham Road, East Finchley, in the County
of Middlesex, late of 27, Drayton Park, Highbury, in the County of London,
Engineer, 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:-
This invention for improvements in or connected with electric arc lamps has
for its object to provide improved carbon holders that shall ensure an efficient
electrical connection. The carbon holder for the movable carbon consists of a
split metal cylinder forming an annular series of spring tongues which grip the
carbon, and to it are riveted springs that pass upward and bear against the
internal surface of the guide tube. In order still further to ensure the passage
Price 8d 1

page_text: of the current to the upper carbon, a copper roller mounted on a link pivoted
inside the mechanism bears on the carbon or, when the feed mechanism is
raised on the arc being struck, on the feed mechanism.
The fixed carbon holder is in a similar way split to form spring jaws and its
exterior surface is tapered. A tapered bush fits on the tapered jaws and has a pin
passing through the slits. To insert a carbon the bush is raised to allow the
jaws to spring outwards; the carbon is then forced downwards and by means of
the pin forced down the bush and closes the jaws on itself.
In the accompanying drawing: Figs. 1 and 2 are sectional elevations at right
angles to each other of an arc lamp constructed according to this invention.
Figs. 3, 4 and 5 are respectively plan, elevation and inverted plan of the top or
sliding carbon holder. Fig. 6 is a section showing the lower carbon holder.
In order to make good and efficient contact between the upper carbon holder f
and the tube b the upper carbon holder is formed out of a cylinder closed at its
upper end and split from the bottom towards the top to form tongues f¹.
Springs are riveted to the bottoms of the tongues f¹ and pass upwards, their
outer ends f3 bearing against the internal surface of the tube b.
In order to still further ensure the passage of the current to the upper carbon,
a copper roller is mounted on a link n pivoted at 2 inside the mechanism
chamber. The length of the link n¹ is such that when the lamp is at rest the
roller rests directly on the carbon and conveys the current to it. When however
the feed device g is raised the roller bears on the feed device as indicated in
dotted lines and conveys the current to the carbon through the feed device.
The negative carbon holder consists of piece c having the recess c¹ at its bottom
for the projection el of the yoke e and the flange that bears against the inside
of the bell d. The nut 3 secures the piece c to the bell. The upper end of the
piece c is bored out to fit the negative carbon and is split to form spring jaws 6
and its exterior surface is tapered. The tapered bush fits on the tapered
jaws and has a pin passing through the slits. To insert a carbon, the bush
is raised to allow the jaws to spring outwards and the carbon is then forced
downwards and by means of the pin forces down the bush and closes the jaws
on itself.
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:-
1. The carbon holder consisting of a split cylinder forming tongues adapted
to grip the carbon and spring contacts riveted at one end to the tongues and
bearing at the other end on the carbon guide tube.
2. The negative carbon holder comprising the split socket with tapered
exterior surface and an internally tapered bush fitting on the tapered jaws
and having a pin adapted to pass through the slits in the socket.
3. The means for conveying current to the movable carbon consisting of a
contact roller, a link carrying the contact roller and a piece fixed to the feed
devices that raises the roller off the carbon when the feed devices are operative.
4. The improved carbon holders for electric arc lamps substantially as described
with reference to the drawings.
5. The improved means for conveying current to the movable carbon of an
electric arc lamp substantially as described with reference to the drawings.
Dated this 4th day of December 1899.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.