Improvements in Central Draught Oil Lamps.
Year: 1894

page_text: Date of Application, 28th May, 1894
Complete Specification Left, 23th Feb., 1895-Accepted, 6th Apr., 1895
PROVISIONAL SPECIFICATION.
Improvements in Central Draught Oil Lamps.
We ALFRED HENRY GRIFFITHS, Managing Director, and THOMAS BAKER
SMITH, Manager of Lamp Department, both of Surrey Works, Smethwick, near
the City of Birmingham, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in oil lamps, having a central draught of
air, and its object is to provide improved means whereby the said central draught,
and also the external draught are cut off, and more particularly the former.
It consists as follows:-Inside the central tube (which extends from the top of
the wick to the exterior) at the bottom of the reservoir &c., suitable guides are
made to receive a sliding leg throughout its length. At the upper end of this leg
is the spreader. This leg is made in two parts which are separably connected to
each other, at a little distance down the tube by means of a bayonet joint
A certain amount of
fastening. Other forms of fastening may also be used.
looseness is permitted with the spreader, so that if required it may accommodate
itself horizontally to the lifting tube hereinafter described. At the lower end of
this leg and at a short distance from the lower opening of the central tube, is
carried a cover plate, whose upper surface is preferably covered with cork, which,
when the spreader is raised (and therewith the whole of the leg) is lifted up to and
against the said lower opening of the tube and thus blocks off the passage.
Between the said cover plate and one of the leg guides, is a spring, whose tendency
is always to keep the said plate in its lowest (open) position. Upon the outer wick
tube is the usual sliding tube or sleeve which is raised and lowered at will by a
lever from the exterior of the burner. Secured to this sliding sleeve are laminar
springs which impinge or bind úpon the wick tube, so as to hold the said tube &c.
in its raised position, against the downward pull of the leg spring.
Its action is somewhat thus:-Upon raising the outer sleeve, it first strikes
against the underside of the spreader, and thereby shuts off all supply of air to
the exterior of the wick. In its continued rise it lifts the spreader (against the
spring pressure) and thereby the bottom plate cover, until the latter securely cuts
off the internal supply of air, and thus the flame is perfectly extinguished. By
reason of the laminar springs, the whole is supported in this raised position, until
wilfully lowered by the lever. By reason of the freedom given to the spreader (as
before intimated) it readily accommodates itself to the top of the sleeve, whereas
in the sliding sleeves as at present used, with a fixed spreader, should the latter not
be perfectly horizontal, more or less opening exists at one side through which a
little air may pass, and so causes an imperfect extinguishment.
... aut
son 180A
CHARLES T. POWELL,
Applicants' Agent.

page_text: We ALFRED HENRY GRIFFITHS, Managing Director, and THOMAS BAKER
SMITH, Manager of Lamp Department, both of Surrey Works, Smethwick, near
the City of Birmingham, 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 :-
This invention relates to improvements in oil lamps, having a central draught of
air, and its object is to provide improved means whereby the said central draught,
and also the external draught are cut off, and more particularly the former, and in
order to more clearly explain this our invention, we have appended hereunto an
illustrative sheet of drawings upon which are figures and numbers of reference,
similar numbers referring throughout the several views to the same thing
or part.
Fig. 1, shows a general sectional elevation of a lamp embracing this our said
invention.
Fig. 2, is a detail view in elevation of the sliding sleeve and operating lever.
Fig. 3, is a sectional plan view of the sliding sleeve on line A-B (Fig. 2).
Fig. 4, is a sectional elevation of the sliding sleeve on line CD (Fig. 3;.
Fig. 5, is a detailed front view of the impinging spring.
Figs. 6 and 7, are detailed views of the bayonet joint fastenings of the
sliding leg.
Fig. 8, is a sectional plan view on line E-F Fig. 6.
Fig. 9, is a plan view of Fig. 7.
Figs. 10 and 11, show modifications of screw fastenings in place of the bayonet
joint.
•
It consists as follows:-14, is the burner, 15 is the oil container, 16, is the outer
wick tube. Inside the central tube 17, (which extends from the top of the wick
to the exterior at the bottom of the reservoir &c.) suitable guides 18 & 19 are
made to receive the sliding leg consisting of the two parts 20 20%, throughout its
length. At the upper end of this leg is the spreader 21. This leg as before
intimated, is made in two parts 20 20%, which are separably connected to each
other, at a little distance down the tube by means of a bayonet joint fastening, in
which is a slot 22 which engages with the outstanding peg 23, see also Figs. 6, 7
& 9. Other forms of fastening may also be used, as for instance a screwthread
arrangement as seen at 22ª, and 23ª, in Figs. 10 & 11. A. certain amount of
looseness is permitted with the spreader, so that if required it may accommodate
itself horizontally to the lifting tube hereinafter described. At the lower end of
this leg and at a short distance below the lower opening of the central tube, is
carried the cover plate 24, whose upper surface is preferably covered with cork 25,
which, when the spreader 21, is raised by the lever 26, (and therewith the whole
of the leg) is lifted up to and against the said lower opening of the tube, as shown
in dotted lines, and thus blocks off the passage. Between the said cover plate 24,
and the leg guide 18, is a spring 27, whose tendency is always to keep the said
plate 24, in its lowest (open) position. Upon the outer wick tube 16, is the usual
sliding tube or sleeve 28, which is raised and lowered at will by the lever 26, from
the exterior of the burner. Secured to this sliding sleeve 28, are laminar
springs 29, 29, which impinge or bind upon the wick tube 16, so as to hold the
said sleeve 28, &c. in its raised position, against the downward pull of the leg
spring 27. 30, is a collar secured to the rod 20º, having openings 31, through
which the air may pass. The downward travel of the cover 24, is determined by
the nipped in projection 32, upon which the collar 30 rests. In the collar 30, is a

page_text: notch 33, which engages with the guide 19, which latter serves also to prevent the
rotation of the rod 20%.,
Its action is somewhat thus:--Upon raising the outer sleeve 28, it first strikes
against the underside of the spreader 21, and thereby shuts off all supply of air to
the exterior of the wick. In its continued rise it lifts the spreader (against the
spring 27, pressure) and thereby the bottom plate cover 24, until the latter securely
cuts off the internal supply of air, as shown in dotted lines, and thus the flame is
perfectly extinguished. By reason of the laminar springs 29, 29, the whole is
supported in this raised position, until wilfully lowered by the lever 26. By
reason of the freedom given to the spreader (as before intimated). it readily
accommodates itself to the top of the sleeve, whereas in the sliding sleeves as at
present used, with a fixed spreader should the latter not be perfectly horizontal,
inore or less opening exists at one side through which a little air may pass, and so
causes an imperfect extinguishment.
We are aware that a top and bottom closing of the inner and outer wick tubes
has been already done, and therefore we do not claim these, but :-
-
Having now particularly described and ascertained the nature of this our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1. The combination with the burner 14, container 15, outer tube 16, and inner
tube 17, of the central through rod 20, 20ª, having at its one end the spreader 21,
and at the other end the cover 24, substantially as and for the purposes
specified.
2. The combination with the inner and outer wick tubes of a lamp as herein-
described and illustrated, having the central through rod 20, 20", of the spring 27,
by which the working position of the spreader 21, and the cover 24 are ensured
when the sleeve 28, is lowered.
3. Making the central rod 20, 20ª, in two parts and secured together as set forth
and shown.
4. The combination with the sliding sleeve 28, lever 26, tube 16, spreader 21,
rod 20, 20ª, cover 24, and spring 27, of the springs 29, as set forth and shown.
5. The general combination and arrangement of the parts constituting these
our improvements in central draught lamps, substantially as herein described and
illustrated.
Dated this 27th day of February 1895.
CHARLES T. POWELL,
12, Cherry Street, Birmingham, Applicants' Agent.