Improvements in or relating to Reflector Holders for Incandescent Electric Lamps.
Year: 1898

page_text: Date of Application, 10th Feb., 1898-Accepted, 7th May, 1898
COMPLETE SPECIFICATION.
Improvements in or relating to Reflector Holders for Incandescent
Electric Lamps.
I, HANS JACOB MÜTZ, of 12, Riemergasse, Vienna, in the Empire of Austria,
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:-
The reflectors at present intended for use with electric incandescent lamps are
very frequently provided in their central aperture with a holder or socket in
which the incandescent lamp is inserted. This socket is usually connected
by means of cement or other method of fastening with the reflector
discs formed of glass or the like, which fastening can only be discon-
nected with difficulty and cannot be replaced without some trouble in case of any
accident and consequently a new reflector disc and holder or socket and foot must
be inserted.
The present invention has for its object to form a connection between the
reflector shade and the incandescent lamp holder in such a way that the reflector
shade may be changed without trouble, and for this object, the holder or socket
is arranged in the manner hereinafter described.
A metal holder a, Figure 1, is formed to correspond with the kind of incan-
descent lamp required, the upper part of which holder represents an incandescent
lamp foot and fits into an incandescent lamp holder connected with the electric
wire, In the form shown in the drawing, Figure 1, this holder is arranged on
Edison's system. The lower part of the holder a is provided with an edge or
ring 6 on which the reflector shade chaving a central aperture rests. In order to
give this a firm hold on the edge bit is pressed firmly against the same by means
of a cap which is preferably bell shaped and is fastened in the centre part of
the lamp socket or holder a and held securely by means of the pressure exerted
all round by the cap f at the edge g. The connection of the holder a and cap f
takes place preferably by the lamp holder a being provided on its outer surface
with a thread d over which the reflector holder or cap f having a corresponding
internal thread e is screwed.
Other suitable arrangements for connection may however be used, such for
instance as bayonet joints having oblique cross slits and other like arrangements
so long as by their means the pressing of the holder f on the reflector shade c is
obtained. The method of inserting or changing the reflector shade is evident
from the foregoing description without further explanation.
As shown in Figure which represents a Siemens holder, the reflector shade c
may be provided at its outer edge with a ring h and the cap f made so large that
it encounters said ring at the point g. By this means a protective casing for the
reflector shade is also formed. The lower part of the cap or holder f which covers
the reflector may also be provided with a mirror backing or other suitable reflect-
ing substance on its inner side in which case the covering of the reflector shade c
may be dispensed with as superfluous, and the latter then plays the part of a

page_text: protective casing for the mirror part of the cap f. Such an arrangement has two
important advantages, first the greater cheapness of the glass globe which as is
well known are easily damaged and require frequent renewal, which cheapness
is obtained on account of the mirror backing being dispensed with, and second the
increased durability of the mirror surface in consequence of the layer of air
enclosed between it and the glass globe.
In the two arrangements herein before described, the glass reflecting bell or
rather the cap or cover f is inserted from the underside of the lamp holder. The
directions in which the ring h and edge g exert their pressure on the shade may
also be reversed as shown in Figure 3. In this case the inner edge of the globe
bears from the underside against the ring b and the cap f covers the glass globe
entirely and is turned inwards at the point g round the edge of the reflector. Its
inner thread e (or other suitable fastening) must have such a clear width that it
may be passed over the ring 6 because in this arrangement the insertion must
take place from the underside and consequently the central part of the holder a
must also be correspondingly widened. With this arrangement either the reflector c
or the lower saucer shaped part of the holder f may be provided with the mirror
or reflecting surface.
The holder herein before described may also be carried out in the manner shown in
Figure 4 where the lamp holder a is divided, and its upper part which is formed
as the foot of an incandescent lamp forms one piece with the bell shaped reflector
cap f, the latter being made in one piece with the foot of the lamp or connected
with it by soldering or the like. The lower part forming the lamp holder then
ends above with a thread d over which the reflector holder provided with an
internal thread e is screwed in the manner hereinbefore described and thus the
reflector shade is firmly held or clamped.
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 I
claim is :-
1. A holder for reflectors for incandescent electric lamps, consisting of a holder (a)
arranged in its upper part as the neck of the incandescent lamp and in its lower
part as an incandescent lamp socket and provided with an edge or ring (6) for
supporting the reflecting shade (c) and a cap (f) adapted to be brought into engage-
ment with the central part of said lamp holder (a) to press the reflecting shade (c)
on the edge of the ring (b), substantially as hereinbefore described and shown in
the accompanying drawing.
2. A holder for reflectors for incandescent electric lamps, consisting of a cap
which presses the reflector (c) on the ring (b), entirely covering the reflector glass
on the rear side and thus forming a protective casing for the same, substantially
as hereinbefore described and shown in the accompanying drawings.
3. A holder for reflectors for incandescent electric lamps, consisting of a cap (f)
forming a protective casing and provided with a mirror or suitable reflecting-
surface on its underside and a shade (c) forming a protection for the mirror surface
against atmospheric influences substantially as hereinbefore described and shown
in the accompanying drawings.
4. In a holder for reflectors for incandescent electric lamps, a modification con-
sisting in a holder (a) being divided, and having its upper part formed as the foot
of an incandescent lamp firmly connected with the ring (b) substantially as herein-
before described and shown in the accompanying drawings.
Dated this 9th day of February 1898
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.