Improvements in Glow Lamps and Holders."
Year: 1898

page_text: Date of Application, 5th Nov., 1898
Complete Specification Left, 1st Aug., 1899-Accepted, 2nd Sept., 1899
PROVISIONAL SPECIFICATION.
"Improvements in Glow Lamps and Holders."
I, EDWIN JAMES PRESTON of the Firm of J. Stone & Co. of Deptford in the
County of Kent Engineers do hereby declare the nature of this invention to be as
follows:-
These improvements in glow lamps and holders have for object to provide better
adhesion or keying power between the plaster or other composition and the metal
ring of the socalled cap of the lamp, also to provide additional security for retaining
the cap in the holder in the event of the breaking of the bayonet pins of the cap.
For this purpose I form the aforesaid ring of the cap with two bayonet joint like
recesses opposite to each other by bulging in the ring at these places by means of
a correspondingly shaped blunt ended tool whereby projections or keys are formed
on the inside of the ring, and I form on two opposite sides of the holder two
depressions in the said outside whereby two corresponding bulges or projections on
the inside are produced which engage with the aforesaid bulged in bayonet recesses
in the ring of the cap. The projections may of course be formed in any other
suitable manner as for instance by providing pins or set-screws.
When the cap is
put into the holder the pins of the former enter the present bayonet notches in the
latter, the aforesaid projections in the holder will also enter the bayonet recesses of
the ring of the cap and when the cap and the holder are turned one against the
other they will be secured to each other not only by the present bayonet joints but
also by the two additional bayonet joints provided by my invention.
If I merely
form two broad rectangular recesses by bulging in the ring of the cap I do away
with the extra security of bayonet joints but retain the other aforesaid advantage.
I prefer to make the recesses in either form slightly deeper in one place whereby I
improve their keying power.
COMPLETE SPECIFICATION (AMENDED). -
"Improvements in Glow Lamps and Holders."
I, EDWIN JAMES PRESTON of the Firm of J. Stone & Co. of Deptford in the
County of Kent, Engineers, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement.

page_text: These improvements in glow lamps and holders have for object to provide better
adhesion or keying power between the plaster or other composition in the socalled
cap of the lamp and the metal ring part of said cap, also to provide additional
security for retaining the cap in the holder in the event of the breaking of the
bayonet joint pins on the cap ring.
In the accompanying drawing Fig 1 is a side elevation of a glow lamp with its
cap and Fig 2 a plan of the latter; Fig 3 is a side elevation of the holder and Fig 4
an inverted plan of same. Fig. 5 is a side elevation of the lamp in its holder.
A is the ring of the cap provided with the usual bayonet joint pins B opposite
to each other. C is the holder with the usual bayonet joint notches for the pins B
to enter. For the aforesaid purposes of my invention I provide additional bayonet
joint devices, by forming the ring A with two bayonet joint like recesses EE
opposite to each other by bulging in the ring A at these places by means of a corre-
spondingly shaped blunt ended tool whereby projections or keys are formed on the
inside of the ring (thus affording the aforesaid better adhesion or keying power
between the plaster or other composition in the ring and the inside of the latter)
and I form on two opposite sides of the holder C two depressions in the said outside
whereby two corresponding bulges or projections F F on the inside are produced as
seen in the plan view Fig. 4 which engage with the bulged in bayonet recesses E E
in the ring A of the cap. The projections may of course be formed in any other
suitable manner as for instance by providing pins or set screws, but I prefer the
manner here illustrated for cheapness.
When the cap is put into the holder, the pins B of the former enter the present
bayonet notches D in the latter, and the aforesaid projections F in the holder will
also enter the bayonet joint recesses E E of the ring or cap A and when the cap
and the holder are turned one against the other they will as shewn in Fig. 5 be
secured to each other not only by the two present bayonet joints B D but also by
the two additional bayonet joints E F provided by my invention. If-1-merely-form
two-broad-rectangular-recesses-by-bulging in-the-ring A-I--do-away--with-the-extru
security-of-bayonet joints-but-retain-the-other-aforesaid-advantage--viz.--the--better
prefer to make the recesses in--either-form
keying-of-the-plaster-in-the-cap.
slightly deeper in one place whereby I improve their keying power.
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 claira
is :-
4. Providing additional-keying-power-between-the-enp-and-the--plaster-or-other
material-within-it-by-means-of-inwardly-bulged recesses-in-the-eap-ring-substantially
as-set-forth:
1. 2. Providing additional keying power between the cap and the plaster or other
material within it and also additional security for retaining the cap in the holder by
forming the cap ring with inwardly bulged bayonet joint recesses and by forming
the holder with corresponding bulged in parts or otherwise forming or providing
projections on the inside of the holder for engaging with the said recesses sub-
stantially as set forth.
2. 3. The construction of cap and holder shewn on the drawing.
Dated thio Think first day of
1900