Year: 1888

page_text: I, EDWARD FREDERICK HERMANN HEINRICH LAUCKERT, of Charlton, in the
County of Kent Electrical Engineer, do hereby declare the nature of this invention
to be as follows:-
My invention relates to an improved construction of holders for electric glow
lamps and consists mainly in carrying the helical supporting spring for the lamp upon
a bracket so arranged that the bottom of the spring is thereby raised some distance
above the insulating base of the holder so as to leave a clear space below it and thus
allow the small contact springs to which the loops of the glow lamp are hooked to be
easily reached. I prefer to construct such holders as follows:-The bracket consists
of a metal disc having a threaded central hole for screwing on to the support and a
vertical side arm rising to any desired height above the base of insulating material
which is preferably of slate or earthenware and which is fixed on the upper side of
the disc; on the upper end of the arm of the bracket is formed a horizontal ring
projecting over the base, on which ring rests the lower end of the helical supporting
spring into which the bottom of the glow lamp fits, the spring being attached to the
ring of the bracket by claws on the latter or by any other suitable means. The
insulating base which is made of one piece is secured to the disc of the bracket by
screws or otherwise and either carries on its upper surface two metal plates carrying
the contact springs for the lamp and the pinching screws for the circuit leads, or the
contact springs may pass through holes in the insulating base the one being connected
to a central spring contact on the underside of the same with which one lead makes
contact while the other spring is put in metallic contact with the disc of the bracket
with which the other lead is connected.

page_text: Improvements in Holders for Electric Glow Lamps.
1, EDWARD FREDERICK HERMANN HEINRICH LAUCKERT, of Charlton, in the
County of Kent, 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 :-
My invention relates to an improved construction of holders for electric glow
lamps and consists mainly in carrying the helical supporting spring for the lamp upon
a bracket so arranged that the bottom of the spring is thereby raised some distance
above the insulating base of the holder so as to leave a clear space below it and
thus allow the small contact springs to which the loops of the glow lamp are hooked
to be easily reached.
I prefer to construct such holders as I will proceed to describe with reference to
the accompanying drawings in which Figs. 1 and 2 shew a side and front clevation
of one arrangement, and Figs. 3 and 4 shew a vertical section and a sectional plan of
the same. The bracket consists of a metal disc a having a threaded central hole b
for screwing on to the support and a vertical side arm c rising to any desired height
above the base of insulating material d which is preferably of slate or earthenware
and which is fixed on the upper side of the disc; on the upper end of the arm of the
bracket is formed a horizontal ring e projecting over the base, on which ring rests the
lower end of the helical supporting spring finto which the bottom of the glow lamp g
fits, the spring being attached to the ring of the bracket by claws e on the latter or
by any other suitable means. The insulating base d, which is made of one piece, is
secured to the disc of the bracket by screws h or otherwise, and carries on its upper
surface two metal plates ii carrying the contact springsj j for the lamp and the
pinching screws k k for the circuit leads.
Figs. 5 and 6 shew side and front views and Figs. 7 and 8 a vertical section and a
sectional plan of another modification. The principal parts are of the same construc-
tion as above described and are indicated by the same letters of reference, the only
difference being in the manner in which the electrical contacts are made. In this
case the springs jj¹ are situated in recesses in the insulating base d, the one spring j
being electrically connected to a blade spring on the underside of the base, which
makes contact with a central conductor in the support on which the holder is fixed,
while the other spring ; is in electrical connection through wire m and screw h with
the bracket a to which the other lead of the circuit is connected.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The use for supporting electrical glow lamps of holders composed of a disc such
as a for fixing to the support, and carrying the insulating based with contact
springs and electrical connections, and a, ring such as e carrying the supporting

page_text: spring of the lamp, the ring being connected to the disc a by an arm such as c of such
a height as to leave sufficient space between the ring e and the base to allow of
ready access to the contact springs, substantially as herein described.
2. In holders for electrical glow lamps, the combination of the bracket a ce
with the supporting spring f, insulating base d, contact springs j plates i and
contact screws substantially as described with reference to Figs. 1 to 4 of the
drawings.
3. In holders for electrical glow lamps, the combination of the bracket ace with
the supporting spring finsulating base d and contact springs jj connected respectively
with the bracket ace and with the central contact 1, substantially as described with
reference to Figs. 5 to 8 of the drawings.
ABEL & IMRAY,
Agents for the Applicant.