Improvements in Electric Arc Lamps.
Year: 1894

page_text: Date of Application, 4th July, 1894
Complete Specification Left, 3rd Apr., 1895-Accepted, 4th May, 1895
PROVISIONAL SPECIFICATION.
Improvements in Electric Arc Lamps.
I, JAMES BROCKIE, of "Fairview," Tyson Road, Forest Hill, in the County
of Kent, Engineer, do hereby declare the nature of this invention to be as
follows:--
This invention relates to a simple and strong construction of the framework and
convenient arrangement of the working parts of electric arc lamps.
I provide a disc or plate which I shall call the main base plate of the lamp.
To the under side of this plate 1 fix a tube sufficiently far from the centre to
allow the upper carbon holder to clear it.
This tube is a little longer than the travel of the upper carbon, to its lower end
I fix the middle of a cross head having at its two ends bosses through holes in
which the negative and positive carbon holder rods pass corresponding holes
through the base plate form upper guides for these two rods. One pair of the
guide holes are insulated or bushed with insulating material.
The tube above mentioned serves to keep the two sliding rods from turning
during their up and down movements, these rods having fixed to them arms
with forked ends which bear against the tube but are of such shape that they can
pass each other.
To an arm at the lower end of one of the sliding rods I fix the lower or negative
carbon holder the carbon socket being in line with the centre of the base plate.
To the other rod at a part between the base plate and the crosshead I fix the
positive or upper carbon holder, its socket being in the same vertical line with
the centre of the base plate; and therefore with the lower carbon.
The tube above mentioned also serves for supporting the globe. A metal
ring is fitted to the top opening of the globe and this ring has an arm projecting
towards the centre ; a rod fixed in this arm, slides up and down the tube,
a button at its end preventing it coming out of the tube which has a restricted
opening at its lower end.
The upper parts of the lamp may be arranged in any convenient manner.
For instance a central tube or pillar may be fixed in the base plate, the top of
this tube or pillar carrying a U shaped piece within which the brake and focussing
wheel or other gearing are placed. Cords passing over the focussing wheel are
attached to the tops of the positive and negative rods respectively.
This central tube or pillar may constitute a dash pot to retard the descent of the
top carbon holder rod.
For this purpose a cord wound upon the brake wheel or a drum upon its spindle
is attached to a piston in the dash pot so that as the top carbon descends the piston
is drawn up.
The piston may be somewhat heavy and the cord attached to it may be wound
upon a fuzee or snail so as to compensate for the loss of weight resulting from
consumption of the carbons.
The crown plate of the lamp is fixed to the top of the U shaped piece. Instead of
having one guide tube placed out of the centre of the base plate as described there
may be fixed to the underside of the base plate two tubes or pillars to the lower
ends of which a ring is fixed, through holes in which the carbon holder rods pass.
The forked guide arms on the carbon holder rods may then slide upon these two
pillars respectively.

page_text: The pillars may be made hollow so that two rods fixed to the globe carrier may
pass up and down within them.
ABEL & IMRAY,
Agents for the Applicant.
ашргоощадью и посито это нашро.
I, JAMES BROCKIE, of Fairview, Tyson Road, Forest Hill, in the County
of Kent, 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 relates to a simple and strong construction of the framework and
convenient arrangement of the working parts of electric arc lamps.
Figs. 1 and 2 of the accompanying drawings are elevations on planes at right
angles to each other of the framing of a lamp according to my invention.
Fig. 3 is a plan on the line 3-3 of Fig. 2, and Fig. 4 is a part plan shewing
a modification.
I provide a disc or plate A which I shall call the main base plate of the lamp.
To the under side of this plate I fix a tube B sufficiently far from the centre to
allow the upper carbon holder C to pass clear of it.
This tube is a little longer than the travel of the upper carbon; to its lower end
I fix the middle of a crosshead D having at its two ends bosses E and F through
holes in which the negative Gand positive H carbon holder rods pass; corresponding
boles through the base plate A form upper guides for these two rods. One pair
of the guide holes 9 and g' are insulated or bushed with insulating material as
shewn.
The tube B serves to keep the two sliding rods from turning during their up and
down movements, these rods having fixed to them arms J K with forked ends
which bear against the tube but are of such shape that they can pass each other.
As shewn in Fig. 4, the tube B may be formed with ribs engaged by notches at
the ends of the arms J and K.
To an arm at the lower end of the sliding rod G I fix the lower or negative carbon
holder N, the carbon socket being in line with the centre of the base plate. To
the other rod H at a part between the base plate and the crosshead D, I fix the
positive or upper carbon holder C, its socket being in the same vertical line with
the centre of the base plate, and therefore with the lower carbon.
The tube B also serves for supporting the globe R. A metal ring Q is fitted to
the top opening of the globe R and this ring has an arm S projecting towards the
centre; a rod T fixed in this arm slides up and down the tube B, a button V at its
end preventing it from coming out of the tube which has a restricted opening at
its lower end.
"
The ring Q, to which the globe R is fixed by wire netting or otherwise, rests on
pins on the ends of the crosshead D, these pins entering into holes made in lugs
projecting inwards from the ring Q. By raising the globe a little so as to disengage
the ring from these pins and then slightly turning it on T as an axis the globe
can then be lowered as far as T permits.
For
The upper parts of the lamp may be arranged in any convenient manner.
instance, a central tube or pillar W may be fixed in the base plate A, the top of
this tube or pillar carrying a U shaped piece X within which the brake and
focussing wheel Y or other gearing is placed. Cords passing over the wheel Y are
attached to the tops of the positive and negative rods H and G respectively.
The central tube or pillar W may constitute a dash pot to retard the descent of

page_text: the top carbon holder rod: For this purpose, a cord wound upon the brake wheel
or a drum upon its spindle is attached to a piston in the dash pot so that as the top
carbon descends the piston is drawn up.
The piston may be somewhat heavy and the cord attached to it may be wound
upon a fuzee or snail so as to compensate for the loss of weight resulting from
consumption of the carbons.
The crown plate Z of the lamp is fixed to the top of the U shaped piece X.
Instead of having one guide tube B placed out of the centre of the base plate as
described, there may
be fixed to the underside of the base plate two tubes or pillars,
to the lower ends of which is fixed a ring or disc through holes in which the carbon
holder rods pass.
The forked guide arms on the carbon holder rods may then slide along these two
pillars. The pillars may be made hollow so that two rods fixed to the globe carrier
may pass up and down within them being held by suitable catches.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
The construction of the framework and arrangement of the working parts of an
electric arc lamp, substantially as described with reference to the drawings.
Dated this 3rd day of April 1895.
ABEL & IMRAY,
Agents for the Applicant.