Year: 1888

page_text: Date of Application, 23rd Mar., 1888
Complete Specification Left, 5th Dec., 1388
Complete Specification Accepted, 29th Jan., 18
We, EDWARD FREDERICK HERMANN HEINRICH LAUCKERT of Charlton in the
County of Kent, Electrical Engineer and ERNST HERMANN HAENSEL also of Charlton
aforesaid Electrical Engineer do hereby declare the nature of this invention to be as
follows:-
The holder for an electrical glow lamp is frequently screwed as a socket upon
the end of a tube through which passes an insulated electrical conductor, and the end
of the conductor is, by the screwing up of the holder, made to press upon a contact
within the holder, whereby the electrical current is conveyed to the lamp. It often
happens that on board ship or in any other position where there is considerable shake
and vibration the holder tends to become unscrewed to such an extent that the contact
within it is broken and the light consequently becomes extinguished.
Our invention relates to means of providing against this by making the holder
with a locking device which prevents the holder from becoming unscrewed by jar or
vibration, but does not prevent it from being purposely screwed or unscrewed when
sufficient force is applied to turn it.
For this purpose we fix a spring to the plate or bracket which is attached to the
tube containing the conductor, and which is usually secured to a ceiling, partition or
other stationary object, and we make in the end of this spring a groove or furrow
with sloping or rounded sides. On the holder we provide a stud, or several studs
projecting towards this groove, so that when the holder is screwed up, one or other of
these studs becomes engaged or latched in the groove of the spring in which it is held
with sufficient force to prevent the holder from turning round to unscrew itself. If,
however, it is desired to unscrew the holder it can be turned forcibly, the
stud escaping along the sloping side of the groove for which the spring gives
sufficient yield.

page_text: COMPLETE SPECIFICATION.
An Improvement in Holders for Electrical Glow Lamps.
We, EDWARD FREDERICK HERMANN HEINRICH LAUCKERT of Charlton in the
County of Kent Electrical Engineer and ERNST HERMANN HAENSEL, also of Charlton
aforesaid, Electrical 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 holder for an electrical glow lamp is frequently screwed as a socket upon the
end of a tube through which passes an insulated electrical conductor and the end of
the conductor is, by the screwing up of the holder, made to press upon a contact
within the holder whereby the electrical current is conveyed to the lamp. It often
happens that on board ship or in any other position where there is considerable shake
and vibration the holder tends to become unscrewed to such an extent that the
contact within it is broken and the light consequently becomes extinguished.
Our invention relates to means of providing against this by making the holder with
a locking device which prevents the holder from becoming unscrewed by jar or
vibration, but does not prevent it from being purposely screwed or unscrewed when
sufficient force is applied to turn it.
For this purpose, we fix a spring to the plate or bracket which is attached to the
tube containing the conductor, and which is usually secured to a ceiling, partition or
other stationary object, and we make in the end of this spring a groove or furrow
with sloping or rounded sides. On the holder we provide a stud, or several studs
projecting towards this groove, so that when the holder is screwed up, one or other of
these studs becomes engaged or latched in the groove of the spring in which
it is held with sufficient force to prevent the holder from turning round to unscrew
itself.
If however, it is desired to unscrew the holder it can be turned forcibly, the stud
escaping along the sloping side of the groove for which the spring gives sufficient
yield.
The accompanying drawings shew our invention applied to various forms of fixing
for electric glow lamps. In the fixing shewn in elevation by Fig. 1 and in the
modified form shewn in elevation by Fig. 2 and plan by Fig. 3. A the holder of
the lamp has on its upper face several rounded studs B, and a bent spring C is fixed
to the stationary collar or plate D, this spring having a slot or groove which can
engage on one or other of the studs B with sufficient hold to prevent the lamp holder
from unscrewing itself by vibration, but not enough to prevent it from being screwed
or unscrewed when such force is applied as can make the rounded stud push back the
spring and release itself from its hold in the slot or groove of the spring. In like
manner when the fixings are of the kind shown by Figs. 4 and 5, the lamp holder A
has its rounded studs B arranged to engage with the groove or slot of the spring C
which in these cases is fixed on one of the arms D that support the globe. The
L-

page_text: arrangement may be inverted as shewn in elevation by Fig. 6 and in plan by Fig. 7,
the studs B being in this case on the underside of the lamp holder A.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed we declare that what
we claim is —
In combination with the holder of an electric glow lamp and the tube or plate to
which it is screwed a spring fixed to the tube or plate and having a slot or groove
engaging with rounded studs on the lamp holder, substantially as and for the purpose
set forth.
ABEL & IMRAY,
Agents for the Applicants.