Improvements in Incandescent Electric Lamps.
Year: 1896

page_text: Date of Application, 18th June, 1896
Complete Specification Left, 18th Mar., 1897-Accepted, 24th Apr., 1897
PROVISIONAL SPECIFICATION.
Improvements in Incandescent Electric Lamps.
We, EDGAR JULIUS SANDER, of Oxford House, No. 102 Cazenove Road,
Stoke Newington, in the County of Middlesex, Electrician, and ARTHUR
CLIFFORD, of No. 50 St. Quintin Avenue, North Kensington, in the same
county, Electrician, do hereby declare the nature of our invention to be as
follows:-
The present invention. relates to improvements in incandescent electric lamps, and
the object of it is to provide improved means for holding the well known metal cap to
the top of the bulb. Hitherto this has been done by means of plaster of Paris ;
but according to our invention, the use of cement is dispensed with altogether and
detachability at will, provided for.
In carrying the invention into effect, we provide a pair of jaws adapted to
embrace the tab above mentioned and to fill the cap; the fit of the cap over and
to the sides of the jaws, sufficing to keep them closed upon the tab and up to each
other. The material of the jaws is any non-electric. They grip the tab by
means of cavities in their faces embracing the tab and engaging with projections.
thereupon. The relative positions of the projections and the respective cavities.
may be reversed.
The present projections from the sides of the cap, which are provided to engage
in the slot of the bayonet joint of the lamp holder, are replaced by a pair of studs.
carried on the free ends of two spring arms held to the respective jaws, and a pair
of holes in the sides of the cap, one on each side, through which the spring arms!
are adapted to project the said studs. Each stud stands, preferably, close to the
edge of the respective jaw on that side of the bulb, so as to prevent any tendency
of the bulb to rock when it is in the cap.
Suitable guides are provided, such as studs on the jaws and grooves in the cap
and in which they can engage, to make the studs register with the respective holes
in the cap, when the latter is down upon the bulb.
The edge of the cap is, preferably, swaged out to fit over the bulb. The bulb is
detached from the cap by pressing the studs inwards clear of the latter, when either
can be drawn away from the other.
Dated this 18th day of June 1896.
PHILLIPS & LEIGH,
Agents for the Applicants.
Improvements in Incandescent Electric Lamps.
We, EDGAR JULIUS SANDER of Oxford House, No. 102 Cazenove Road,
Stoke Newington, in the County of Middlesex, Electrician, and ARTHUR
CLIFFORD, of No. 50 St. Quintin's Avenue, North Kensington, in the same
ccunty, Electrician 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 present invention relates to improvements in the caps of incandescent electric

page_text: lamps, and the object of it is to provide improved means for holding the said caps
on the tops of the respective bulbs. Hitherto, the holding agent has been plaster-
of Paris, but according to our invention the use of cement is dispensed with.
altogether, and detachability at will provided for.
Referring to the accompanying figures which are to be taken as part of this
specification and read therewith,
Figure 1 is a front elevation of an incandescent electric lamp ready for being
capped according to the present invention.
Figure 2 is a front elevation of an incandescent electric lamp capped according
to the present invention, the cap being shewn in section.
Figure 3 is a sectional plan taken along the line 3-3 of Figure 2.
Figure 4 is a side elevation partly in section of an incandescent electric lamp.
capped according to the present invention.
Figure 5 is a perspective view of oné jaw and its
spring stud.
Figure 6 is a section taken along the line 6-6 of Figure 4.
asis the bulb.and.b the cap. The bottom lip 6" of the latter may be, if preferred,
swaged outwards or flared, to. fit farther over the convex top of the bulb a; as
illustrated in Figure 4.
e is the tab on the top of the bulb a and incorporate with it as heretofore.
d, d are a pair of projections, one from each side of the tab c. They are,
preferably, ridges extending for the full width of the tab. Whatever variation
may be given to the shape of them, there must always be a clear space between
each and the top of the bulb. a, in which can engage a corresponding projection e*
on the respective jaw.
e, e, are a pair of jaws. They may be made out of any suitable insulating
material. They are equal in size and of the same shape. When the two are placed
together in operative position, they constitute a mass which fills the cap b exactly,
excepting that the bottom face ct the said mass is hollowed to receive and fit down
upon the convex top of the bulb.
The function of the two jaws is to fill up the cap. to the same extent as does the
quantum of plaster of Paris usually used'; to lay hold of the bulb a by its tab and
to, hold the bulb.a. and cap b. together.
We have already explained how the two jaws fill the cap, and pointed out that
they are replicas of each other in both size and shape. They are made capable
of: laying hold of the bulb a by the tabe in the following; way. The plane of
junction is: vertical and central. In the bottom. portion of the inner face el of
each, there is a cavity e² of the proper size and shape to receive half of that
portion of the. tab which stands between the top of the bulb. b and the
projection.d. Above the cavity e; there is a second one, e3; of the proper size and
shape to receive one projection d and the half of the portion of the tab e
immediately behind it.
to
The device by which, according to the present invention, the bulb a and the
jaws e,,e held together in the way described above, are held to the cap, consists of
a spring stud, on each jaw. It is carried by the free end of a spring arm
which it is made fast. The opposite end of the said arm is made fast to the jaw in
such a way that the stud is carried projecting horizontally and radially therefrom, and
beyond the convex face of the jaw. The stud on one jaw is exactly opposite that
on the other when the two, are: in their operative positions.. There are two holes
in the cap a in proper position for the studs f, to engage in respectively. g, gare
a pair of vertical guiding, grooves. in, the inner face of the capib, from, near the
bottom edge, or lip. of, it, to the, said, holes. Their function is to guide the cap.b
down over, the studs. f, is a cavity in each, jaw, e behind the arm, deep
enough to allow of.the.respective stud fand. arm f being beut back by the descent
of the cap b. over them until the stud engages, in the hole g...
The studs are long enough to project beyond the periphery of the cap. when
they, stand in the holes g, g, far enough to serve if required as the studs of the
bayonet joint by which the cap is locked in the lamp holder.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The herein before described combination of projections, on the bulb, the pair
of jaws embracing them and filling the cap, and studs adapted to engage, in
the cap.
2. The herein before described combination of projections on the bulb, the pair
of jaws embracing them and filling the cap and studs adapted to engage in
the cap and to serve also as studs to engage in the bayonet joint of the lamp.
holder.
PHILLIPS & LEIGH,
No. 22 Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicants.