Improvements in are Lamp WICK
Year: 1897

page_text: Date of Application, 14th Sept., 1897-Accepted, 19th Feb., 1898
Improvements in are Lamp
WICK
I, WILLIAM. HUMPHREY WHEATLEY, of the Firm of Wheatley and Mackenzie,
Engineers and Patent Agents, of 40, Chancery Lane, in the County of London, do
hereby declare the nature of this invention-a communication to me from Allgemeine
Elektricitäts-Gesellschaft, of 22, Schiffbauerdamm, Berlin, in the Empire of
Germany 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 are lamps with double globes consists in the
special guiding of the cover of the inner globe, in a new friction disc and in a new
suspension apparatus.
With hitherto known are lamps having double globes for the attainment of a longer
duration of burning, the globe cover is only carried and centred from the upper edge
of the inner globe. With inexact construction of the inner globe the result is that
the centre hole in the cover is not concentric with the other part of the lamp and con-
sequently the carbon points are inclined to each other, whereby the lamp is made to
burn badly. This disadvantage is avoided in the present lamp by the globe cover
being guided by the side rods of the lamp.
Furthermore the clutch hitherto used and by which the carbon's often become
jammed, is replaced by a disc clutch. The large number of the friction discs
contained in a ring shaped chamber produces a good but easily disengaged friction.
The new suspension apparatus consists in that the outer globe, with enclosing
cylinder, and the lamp, hang independently of each other and that the enclosing
cylinder rests against the base plate of the regulating gear. A sufficient exclusion of
air is thus obtained. The air in the lamp can only escape by the base plate, with the
gear, being raised from the cylinder hanging to the suspension saddle, by the pressure
of the heated air.
In the accompanying drawings: Fig. 1 is a sectional elevation of a lamp constructed
according to this invention. Figs. 2 and 3 are sectional elevation and plan respec-
tively of the device for guiding the cover of the inner globe. Figs. 4 and 5 show in
vertical and partial horizontal section and in plan the disc clutch and Figs. 6 and 7
show in side and front view the suspension arrangement.
The cover a, Figs. 1-3 is carried by the inner globe b and is provided with two
horn shaped projections c which are guided by the side rods d. The central position
of the top carbon e is thus ensured.
The friction device or clutch, Figs. 4 and 5, consists of a chamber f with a number
of radial grooves g in which are seated the discs h provided with small axes. Besides
these radial grooves the chamber f is provided with a ring groove i in which are
seated the axes of all the discs h, so that the latter cannot fall out of the radial
grooves g when the carbons are changed. The clutch arrangement carried by the
rods k k which by means of the lever gear take part in the movement of the electro
magnet armature m. By the downward movement of the rods k, the friction dises h
bear against a tubular flange n and are thereby forced upwards and into the radial
grooves g. The top carbone can consequently slide downwards.

page_text: The closing of the outer globe o, provided with one opening only, is effected by
cementing said globe in a gallery p the enclosing cylinder q of which, Fig. 1 rests
against the base plate r of the lamp gear. The globe o with gallery p is suspended
separately from the lamp itself, to a common stirrup 8. The base plate r of the lamp
is supported in the slot t of the stirrup 8 through the medium of the guide plate u
and has an upward and downward play. The globe gallery p is provided with links v
in the slots w of which the hooks x of the suspension stirrup engage. The hooks y
riveted to the latter and also the handles z bent on the globe link facilitate raising of
the globe and lamp.
In the normal condition the lamp hangs with the guide plate u in the slot t of the
stirrup 8. The globe o with gallery p are carried by the links v, which hang on the
hooks x. The enclosing cylinder q rests against the underside, of the base plate r
whereby the necessary escape of air in the outer globe is obtained.
If the pressure
increases in the lamp the base plater thereof is raised from the enclosing cylinder q
and the air escapes. With this movement, the guide pins u¹ of the plates u slide in
the grooves t.
By pressing together the handles y and z the outer globe o is also raised and can
be drawn downwards off the lamp by pulling the links v sideways.
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. In arc lamps having double globes the arrangement of a cover (a) of any desired
shape for the closing of the inner globe, guided centrally by means of the side rods (d)
of the lamp.
2. In arc lamps having double globes, the use of a disc clutch, the chamber (f) of
which is grooved radially (g) and concentrically (i) for the reception of the friction
discs (h) provided with axes or similar projections.
.
3. The carriage of the clutch chamber (f) on a rod (k) which by means of a lever
transmission (1) follows the movement of the armature (m) of the regulating magnet,
for the purpose of striking the are and feeding the carbon.
4. In are lamps having double globes a suspension arrangement characterised by a
stirrup (8) in which are hung independently and with an upward and downward play
on guides tu and x w the lamp with the inner globe (b) and the outer globe (o) with
its gallery (p) and an air excluding cylinder (q) from which cylinder, when too great
a pressure is produced inside the outer cylinder, the base plate (7) is raised with
the lamp, in which movement the suspension saddle (s) acts as a guide.
5. An arc lamp constructed and operating as described and shown in the drawings.
Dated this 14th day of September 1897.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.