Improvements in or relating to Electric Arc Lamps or Lighting' Apparatus.
Year: 1896

page_text: Date of Application, 13th Nov., 1896
Complete Specification Left, 11th Aug., 1897-Accepted, 25th Sept., 1897
PROVISIONAL SPECIFICATION.
Improvements in or relating to Electric Arc Lamps or Lighting'
Apparatus. "
I, JOHN SMITH, of Upton Villa, Penge, in the County of Surrey, Engineer, do
hereby declare the nature of this invention to be as follows:-
My invention relates to electric arc lamps or lighting apparatus, and comprises
improved means for supporting, lowering and raising the globes of such lamps,
whereby access to the carbons and carbon-holders and to the interior of the globe
is facilitated and the constraction of the lamp is simplified.
My said invention also comprises improved means for permitting access to the
regulating mechanism of such lamps.
Ieretofore it has been customary to connect the globe to the upper part of the
lamp-frame by means of rods sliding in holes in the said frame or in lugs
thereon, or by means of suitable chains, so that the globe can be lowered through
a suitable distance to permit access to the carbons and carbon-holders and to
the interior of the globe. These arrangements necessitate the employment of
separate devices for securing the globe in position when raised.
Now, according to my invention, I provide means whereby the globe can be
very readily lowered and raised, and, when raised, will be securely held in
position by the same devices which support it when lowered, without the aid of
any separate devices, so that the lowering and raising of the globe can be effected
more easily and in less time than heretofore.
For this purpose, I connect the globe to the upper part of the lamp-frame by
means of folding links so constructed and arranged that, when the globe is in
its normal position, the links, in a folded condition, will project upward from their
points of attachment to the globe and lamp-frame, and will be inclined slightly
inward. And I so arrange the connections of the said links to the globe and
frame that their points of attachment to the globe will be nearer to the centre of
the lamp than their points of attachment to the frame, so that the weight of the
globe will keep the said links, in their folded condition, in such a position as to
sustain or support the globe. To lower the globe, with this arrangement, it is
only necessary to pull the upper end of each pair of the folded links outward and
to allow the weigh of the globe to unfold them and draw them downward.
When fully extended they will support the globe in a suitable position to permit
access to the interior.
I find it advantageous to make the upper link of each pair double and to make
the lower link in such a manner that it will fold into the upper link.
The said links can be arranged either so that the ring or coronet at the top
of the globe will rise up close to the upper part of the lamp-frame, or so that
an air-opening will be left between these parts when the globe is raised. In
the latter case, I sometimes provide suitable stops to prevent rocking or swinging
of the globe.
In applying this improvement to a lamp of the kind described in the specifica-

page_text: tion of Letters Patent No. 24735 of 24th December 1895, I find it advantageous
to pivotally connect the upper link of each pair to a lug or bracket on the plate
or disc to which the magnets and other parts are secured, and the lower link to
a lug or bracket on the ring or coronet at the top of the globe.
To permit access to the regulating mechanism, I provide a peculiarly con-
structed casing for enclosing the same. This casing comprises a flanged upper
piece or cap and an expanding hoop or band of hard rolled brass or other suitable
material, the ends of which preferably overlap one another, and which, when
expanded, will pass easily over the said flanged piece or cap, and, when passed
over it, can be contracted so as to fit closely around the part of the cap of smaller
diameter and around a corresponding part of the frame at the lower end of the
said hoop or band. And I provide a fastening device for securely holding the
said hoop or band in its contracted condition, which device is connected to both
ends of the said hoop or band, and can, without detaching it from either end
thereof, be unfastened or extended to permit the expansion of the hoop or band
sufficiently to permit the latter to be passed up over the said cap so that access
can be had to the regulating mechanism.
I provide one end of the hoop or band with a slot in which slides a pin or
projection on the other end thereof, or I provide other suitable means for pre-
venting upward or downward movement of one end relatively to the other when
the said hoop or band is expanded.
The fastening device which I find it advantageous to employ for the purpose
above specified, comprises a long link pivotally connected to one end of the
expansible hoop or band and a short link pivotally connected to the other end
thereof, the free ends of the said links being coupled together, so that, by turning
the said links into such a position that their pivots are all in line with each
other, the said hoop or band can be tightly clamped upon the said cap and the
lamp-frame, and thus secured in place. Whilst, by turning the said links so as to
extend them, the said hoop or band can be allowed to expand as required for the
purpose above specified.
D
D. YOUNG & Co.,
11 and 12 Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in or relating to Electric Arc Lamps or Lighting
Apparatus.
I, JOHN SMITH, of Upton Villa, Penge, in the County of Surrey,..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:-
My invention relates to electric arc lamps or lighting apparatus and comprises
improved means for supporting, lowering and raising the globes of such lamps
whereby access to the carbons and carbon-holders and to the interior of the globe
is facilitated and the construction of the lamp is simplified.
My said invention also comprises improved means for permitting access to the
regulating mechanism of such lamps.
Heretofore it has been customary to connect the globe to the upper part of the
lamp-fram by means of rods sliding in holes in the said frame on in lugs

page_text: thereon, or by means of suitable chains, so that the globe can be lowered through
a suitable distance to permit access to the carbons and carbon-holders and to
the interior of the globe. These arrangements necessitate the employment of
separate devices for securing the globe in position when raised.
Now, according to my invention, to overcome these objections, I connect the
globe to the upper part of the lamp-frame by means of folding links so constructed
and arranged that the globe can be very readily lowered and raised, and, when
raised, will be securely held in position by the same devices which support it
when lowered, without the aid of any separate locking or fastening mechanism,
so that the lowering and raising of the globe can be effected more easily and in
less time than heretofore, the action of the weight of the globe upon the folding
links and the behaviour of the said links, when thus acted upon, constituting a
perfectly automatic and self-contained means of locking the globe in position
when raised.
I also provide similar means for securely attaching a protecting casing around
the regalating mechanism of are lamps, or other spaces where a similar form of
protection could be advantageously employed.
In the accompanying drawing I have shown how my said invention may be
conveniently and advantageously carried into practice.
Figure 1 is a front elevation, and
Figure 2 a side elevation, showing an arc lamp having my improvements
applied thereto.
A is the lower ring of the lamp-casing and B the globe coronet, to which the
globe C is secured by means of a net or in any other suitable manner. On each
side of the lamp-casing A, preferably at the opposite ends of a diameter thereof,
is situated a forked arm or bracket D extending from the lamp frame and on the
coronet B are similarly mounted arms or brackets E which are adapted to register
with the arnis ]) but do not extend radially outwards so far as the said arms D).
The arms or brackets D, E on each side of the lamp are connected together by
pairs of links F, G of which the link F is made double and is jointed at one end
to the arm 1), so as to be capable of swinging thereon, whilst its other end is
jointed to the other link G which is in turn pivoted to the arm E, the link G,
when the coronet is in its raised position, being adapted to lie between the members
of the link F and between the limbs of the forked bracket D.
When the globe C is in its raised or normal position, the links F, G, in a
folded condition, will project upward from their points of attachment to the
globe and lamp-frame, and will be inclined slightly inward, as shown in full lines
in Figure 1. It will be seen that, by arranging the connections of the said links.
to the coronet B and frame A, as above described, so that their points of attach-
ment to the coronet will be nearer to the centre of the lamp than their points
of attachment to the frame, the weight of the globe will keep the said links, in
their folded condition, in such a position as to sustain or support the globe. To
lower the globe, with this arrangement, it is only necessary to pull the upper end
of each pair of the folded links outward and to allow the weight of the globe to
unfold them and draw them downward. When fully extended they will support
the globe in a suitable position to permit access to the interior, as shown in dotted
lines in Figure 1.
I find it advantageous to make the upper link of each pair double as F F,
Figure 2, and to make the lower link to fold into the upper link, as above
described and shown in Figure 2. It is however obvious that the details of con-
struction may be somewhat altered without departing from the scope of my
invention.
The said links can be arranged either so that the ring or coronet at the top
of the globe will rise up close to the upper part of the lamp-frame or so that an
air-opening will be left between these parts when the globe is raised. In the
latter case, I sometimes provide suitable stops to prevent rocking or swinging
of the globe

page_text: To permit access to the regulating mechanism I provide a peculiarly constructed
casing for enclosing the same. This casing comprises a flanged upper piece or
cap A and an expanding hoop or band H of hard rolled brass or other suitable
material the ends of which preferably overlap one another, as shown in Figure 1.
This hoop or band, when expanded, will pass easily over the said flanged piece or
cap A and, when passed over it, can be contracted as hereinafter described, so
as to fit closely around the part A2 of the cap A¹ of smaller diameter and around
a corresponding part A3 of the frame A at the lower end of the said hoop or
band.
J is a long link pivotally connected at J to the expansible hoop or band H
near one end thereof, and K is a short link pivotally connected at K¹ to the said
hoop or band near the other end thereof and provided with a handle K2, the free
ends of the said links being coupled together, so that, by turning the said links
into such a position that their pivots are all in line with each other, as shown in
Figure 1, the said hoop or band can be tightly and securely clamped upon the said
cap and the lamp-frame and thus retained in place. The said links are arranged
so that the link J will rest on the pivot K¹, when the band is closed, thus forming
a suitable stop for the locking or clamping device; a separate stop may, however,
be employed for this purpose. On the other hand, by turning the said links
so as to extend them, the hoop or band H can be unfastened or extended to permit
the expansion of the hoop or band sufficiently to permit the latter to be passed up
over the said cap so that access can be had to the regulating mechanism.
The hoop or band H is provided at one end with a slot L in which slides a pin
or projection L' on the other end thereof for preventing upward or downward
movement of one end relatively to the other when the said hoop or band is
expanded. Or other suitable means may be employed for this purpose.
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:
First. The employment, in an arc lamp, of folding links attached at one
extremity to the globe and at the other extremity to the lamp-frame so that they
permanently connect these parts in such a manner that the globe, when lowered
to permit access to the carbons, will be efficiently supported, and, when raised to
its closed position, will be instantaneously and automatically locked in such
position, substantially as herein before described.
Second. The improved device comprising the folding links having their free
ends pivotally connected to the relatively movable parts respectively, the con-
nection to the globe being nearer the centre of the lamp than the connection to
the lamp-frame, substantially as, and for the purpose, above specified.
Third. A casing for an arc lamp comprising a hoop or band provided with a
vertical slit or joint and with folding links connecting its edges so that it can be
readily expanded or contracted, as, and for the purposes, above specified.
Fourth. The improved arc lamp constructed substantially as described with
reference to the accompanying drawing, for the purposes above specified.
Dated this 11th day of August 1907
JOHN SMITH.
D. Young & Co.,
11 and 12 Southampton Buildings, London, W.C.,
Agents for the Applicant.