IMPROVEMENTS IN LAMPS OR LANTERNS in
Year: 1889

page_text: and
I, FRANCIS JOSEPH BATEMAN ALLEN of 44 Upper East Smithfield, in the County
of Middlesex, Managing Director of Dretz Davis & Co. Limited, do hereby declare
the nature of my said invention for "IMPROVEMENTS IN LAMPS OR LANTERNS
in what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
A lamp or lantern embodying my said invention is represented in the accompanying
drawings in which
Fig. 1 is a front elevation.
Fig. 2 is a side elevation showing a portion of the upright A of the frame and of
the ring I removed.
Fig. 3 is an enlarged view showing a detail of construction.
The framing of my improved lamp consists of the uprights A A connected by the
parts B B in the usual manner. C is the reservoir of the lamp D the burner of any
convenient construction and E is a perforated plate fitting loosely upon the burner,
the plate E preferably flanged at the periphery as shown, serves as the gallery for
the lamp glass F. The glass F serves; as is usual in lamps or lanterns of this
description, not only as a chimney but also to enclose the flame and protect it against
wind or draught. At the top a cap G fits upon the upper rim of the glass and
with the latter and the plate E completes the casing in which the flame is enclosed.
A spring H forces the cap G down and causes it to press against the glass so that
the same is secured in its place as seen in figure 1.
In lamps or lanterns of this class as heretofore constructed when the same had to
be lighted or trimmed the cap had first to be raised and the glass entirely removed.
I obviate this difficulty as follows:
On the glass F helicoidal bosses or grooves ff are provided, preferably three
though two or more may be used. On the cap G.I provide studs or projections g g
which are capable of engaging with these grooves or bosses and the whole forms a
bayonet joint by which the cap G and glass F are so connected that when the cap is
raised or lowered the glass will move with it. Any other suitable form of connection
may however also be used provided it allows the glass to be readily fixed or detached.
1

page_text: It is usual to provide a suitable stirrup-piece or handle I to facilitate raising the
cap G but in the usual forms of lamps there are no means for holding the cap up
when the lamp is to be trimmed or lit. I now attach to the cap Ga catch J by a hinge
and this enables the cap to be secured when raised as shown in fig. 2, the hooked
portions of the catch engaging to this end with the top portion of the framing.
To protect the glass, lamps or lanterns of this class have hitherto been provided
with a cage or outer frame slipped upon the same from above. This had to be removed
before access could be had to the glass or flame. According to my invention however
I employ elliptical hoops or rings K K which are at k k hinged to the uprights A A.
When they are lowered as shown in fill lines in fig. 1 and 2 they protect the glass
which they surround. When raised as indicated by dotted lines in fig. 1. they are out
of the way. I prefer to make, these rings or hoops K of elastic wire inserting the
ends into the hinges k as shown in fig. 3 this allows their entire removal when desired
whilst they can readily be "sprung" into place as will be well understood.
Lis a ring serving as a handle for convenience in carrying the whole.
It will be obvious that the details of construction may be varied within wide limits
without departing from the spirit of my invention.
Having now particularly described the nature of my said invention and in what
manner the same may be carried into effect I declare that 1 claim
1.) A lamp or lantern in which the glass Fis connected with the cap G by a bayonet
joint or the like as and for the purpose set forth and substantially as shown in the
drawings.
2.) In a lamp or lantern in which the glass F, cap G and plate E form the casing
enclosing the flame the hinged rings K serving to protect the glass.
3.) In a lamp or lantern having a movable cap G, acted upon by a spring Ha
catch J substantially as and for the purpose set forth.
Dated this 12th day of January 188a
BERNHARD DUKES,
226, High Holborn, London, W.C.,
Agent for the Applicant.