Improvements in and relating to Sleeves or Sockets, chiefly designed for Simultaneously Connecting Globes, Reflectors, and the like to Electrical Incandescent Lamps.
Year: 1897

page_text: Date of Application, 30th Aug., 1897
Complete Specification Left, 27th May, 1898-Accepted, 30th Aug., 1898
Improvements in and relating to Sleeves or Sockets, chiefly designed
for Simultaneously Connecting Globes, Reflectors, and the like
to Electrical Incandescent Lamps.
I, CURT BARTENSTEIN, of No. 27, Skalitzerstrasse, Berlin, in the Empire of
Germany, Managing Director, do hereby declare the nature of this invention
to be as follows:-
-
This invention relates to an improved sleeve or socket for securing globes
reflectors and the like to electrical incandescent lamps, or for fixing lamps of
comparatively small size to the ordinary holders.
The object of this sleeve or socket is to enable reflectors, globes shades or the
like, to be secured to electrical incandescent lamps, without the necessity of making
any alteration in the existing lamp-holders, so that trouble and expense,-
attending any change that has to be made in the holders or fittings of chandeliers
(for example) is avoided.
Besides, the improved socket or sleeve may be employed, in case of need, in
securing lamps having comparatively small bases, to ordinary holders.
Now in order to accomplish the purpose above stated and assuming it is desired
to fix lamps with comparatively small bases or supports in ordinary holders, the
sleeve or socket is constructed in the shape of a lamp-foot or base, such as is
generally joined on to the pear-shaped globe of an incandescent lamp; it being
screw-threaded to fit the usual socket or holder of a lamp. Within this part
or in close metallic and electrical contact therewith, there is placed a short
tube of smaller diameter, screw-threaded internally and externally.
The pear-shaped globe is screwed into this tube in the usual manner, by means
of its foot or base; with the result that one contact, of the lamp meets a contact
which is, as usual, secured to the outer part of the sleeve or socket by means of
an insulating piece; while the other contact, of the lamp, is electrically connected
with the said outer part of the sleeve or socket, through the inner tube. The
connection with the conductor (or system of conductors) is effected in the usual
way by screwing the sleeve into the lamp holder.
In placing the reflector (or globe or dome) on the lamp, it is slipped with its
centrally perforated part over the inner tube and secured in position by means
of a nut provided with a flange of sufficient width, the top of the said reflector
being preferably made to bear against the somewhat enlarged lower edge of the
outer part of the sleeve or socket.
The advantage of the arrangement herein described is that it permits any lamp
to be provided with a reflector or dome without necessitating any alteration in
its original holder or fittings, while at the same time enabling smaller lamps
than usual to be employed. As the reflector or dome may be brought very close
to the source of light, a good illuminating effect is obtained.
Instead of the nut a ring provided with a bayonet-joint may be used; and

page_text: the inner tube instead of being screw-threaded internally, may be fitted with a
bayonet arrangement as a means for securing the lamp in position; and the same
applies to the outer part which may be constructed to accommodate the fitting
or holder.
When it is desired to provide lamps, having ordinary bases, corresponding to
the usual form of holders with reflectors, the sleeves or sockets may be so con-
structed that the inner diameter of the lower part of the sleeve is equal to the
diameter of the lamp-base and also, consequently, to the outer diameter of the
outer part, to be inserted into the lamp holder. Where screw-threads are
the means of attachment adopted, the inner tube should, of course, receive the
same screw-thread as the lamp-holder; so that a lamp may be screwed into
the holder direct, without the interposition of any reflector, if desired while the
reflector or dome, whenever it is to be used, may be fitted by means of the novel
sleeve or socket herein described.
The electrical connection of the lamp filament with the contacts of such sleeve
may be effected exactly in the same manner as the connection hitherto adopted,
between the base and holder of the lamp, while the improved sleeve may be
electrically connected with the fitting precisely as has been usual hitherto, since
the outer part exactly corresponds to the foot or base, hitherto usual in incan-
descent lamps, as regards the formation of the circuit.
Dal 20th day of donat 1807
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements in and relating to Sleeves or Sockets, chiefly designed
for Simultaneously Connecting Globes, Reflectors, and the like
to Electrical Incandescent Lamps.
I, CURT BARTENSTEIN, of No. 27, Skalitzerstrasse, Berlin, in the Empire of
Germany, Managing Director, 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 object of this sleeve or socket is to enable reflectors, globes shades or the
like, to be secured to electrical incandescent lamps, without the necessity of
making any alteration in the existing lamp-holders, so that trouble and expense,
attending any change that has to be made in the holders or fittings of chandeliers
(for example) is avoided.
Besides, the improved socket or sleeve may be employed, in case of need, in
securing lamps, having comparatively small bases to ordinary holders.
Figures 1 and 2 of the accompanying drawings represent in section and in
elevation respectively a mode of construction of such sleeves or sockets.
Figure 3 is a modification and
Figure 4a further modification.
Now in order to accomplish the purpose above stated and assuming it is desired
to fix lamps with comparatively small bases or supports in ordinary holders, the
sleeve or socket, Figures 1 and 2, is constructed in the shape of a lamp-foot
or base a, such as is generally joined on to the pear-shaped globe of an incan-
descent lamp, to fit the ordinary holders. Within this part a or in close metallic
and electrical contact therewith, there is placed a short tube 6 of smaller diameter,
screw-threaded internally and externally.

page_text: The pear-shaped globe c is screwed into this tube in the usual manner by
means of its foot or base d; with the result that one contact e of the lamp meets
the contact g, which is, as usual, secured to the part a by means of an insulating
piece f; while the other contact h of the lamp, is electrically connected with the
outer part a of the sleeve or socket, through the inner tube b. The connection
with the conductor (or system of conductors) is effected in the usual way by
screwing the sleeve into the lamp holder.
In placing the reflector (globe or dome) on the lamp, it is slipped with its
centrally perforated part over the inner tube 6 and secured in position by means
of a nut i provided with a flange of-sufficient width, the top of the said reflector
being preferably made to bear against the somewhat enlarged lower edge of the
part a of the sleeve or socket.
The advantage of the arrangement herein described is that it permits any lamp
to be provided with a reflector or dome without necessitating any alteration in
its original holder or fittings, while at the same time enabling smaller lamps
than usual to be employed. As the reflector or dome may be brought very close
to the source of. light, a good illuminating effect is obtained.
Instead of the nut i, a ring provided with a bayonet joint may be used; and
the tube b, instead of being screw-threaded internally, may be fitted with a
bayonet arrangement as a means for securing the lamp in position; and the
same applies to the outer part a, which may be constructed to accommodate any
fitting of holder.
Figure represents a constructional form of such device, in which the part a
of the sleeve, which is to be brought into the lamp fitting is provided with a
bayonet joint arrangement. In this arrangement it is for instance possible to
fasten lamps, provided with a screw threaded base, in bayonet fittings.
The insulating piece f, according to the present example, is made in sections;
both parts ab are connected by the lower insulating piece. It would, however,
also be possible, as in the case of the former arrangements, to utilize an integral
or single insulating piece and to also directly connect the part 6 of the sleeve
or socket with the part a.
Figure 3 shows exactly the same arrangement as Figures 1 and 2, the only
difference being that the lower part h of the connecting sleeve is increased in
diameter to such an extent, that its internal screw threads fit the threads of
the base of incandescent lamps of normal size. According to this arrangement
the lamp may, on employing a reflector be screwed into the sleeve or socket, or,
if no reflector is to be used, the lamp may be screwed directly into the fitting as
desired.
The electrical connection of the lamp filament with the contacts of such sleeve
may be effected exactly in the same manner as the connection hitherto adopted,
between the base and holder of the lamp, while the improved sleeve may be
electrically connected with the fitting precisely as has been usual hitherto, since
the tube a exactly corresponds to the foot or base, hitherto usual in incandescent
lamps, as regards the formation of the circuit.
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. A sleeve or socket for securing reflectors or domes to electrical incandescent
lamps, comprising a part (a) adapted to receive the inner contact (g), and fitting
the ordinary lamp-holder; and a second part or tube (b), connected with the first
part, being screw-threaded internally and externally and electrically connected
with the outer contact; into which tube is screwed the foot or base of the
pearshaped globe of the lamp, while the reflector or dome is passed over the said
tube (b) and retained in position by means of a nut (i) screwed against it.
2. A modified form of sleeve or socket such as is characterized in the 1st
Claim, wherein the part (b) of such sleeve or socket is smaller in diameter than

page_text: the part (a), so that in case of need, lamps with a comparatively small foot or
base may be fitted in the usual or larger holders.
3. A further modification of the sleeve or socket referred to in the First and
Second Claims, wherein either in the tube a or bor both in a and b, a bayonet
joint arrangement is employed in connecting the parts, instead of a screw-thread,
should the lamp and lamp-holder be themselves fitted for bayonet connection.
4. An electrical incandescent lamp comprising a sleeve or socket (a, b), such
as is referred to in Claims 1 to 3, screwed into the foot or base of the lamp,
or connected therewith by a bayonet joint, and fitting the usual lamp sockets or
holders, and a nut (2) or a ring constructed for bayonet connection (as the case
may be), secured along with a reflector or dome, on the tube 6 of the sleeve or
socket.
5. A modification of the sleeve or socket referred to in the First to Third Claims,
wherein, as shown in Figure 4 the part a only of the sleeve which is to be
brought into the lamp fitting is provided with a bayonet joint arrangement to
connect said part a with said lamp fitting, by this arrangement it is possible to
fasten lamps, provided with screw threaded bases, in bayonet joint fittings.
Tit
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.