IMPROVEMENTS IN SAFETY APPARATUS FOR GAS BURNERS
Year: 1884

page_text: I The Honorable JOHN WILLIAM PLUNKETT of Dunstall Priory near Sevenoaks
in the County of Kent and of 15 Park Square Regents Park in the County of
Middlesex do hereby declare the nature of said Invention for "IMPROVEMENTS IN
SAFETY APPARATUS FOR GAS BURNERS" to be as follows:-
•
My Invention relates to safety apparatus for Gas burners of the description
constituting the subject matter of Letters Patent No 643 A.D. 1882 N° 6142
A.D. 1882 and N° 2803 A.D. 1883 and it has for its object to provide a simplo
means for enabling the Gas tap to be supported without being held by the hand in
an open position until the lever acted upon by the expanding bar has become
heated sufficiently to be moved into position to support the said tap so that it will
be automatically released should the Gas flame be accidentally extinguished.
According to my present Invention I form on or attach a bar or rod to the plug
of the gas tap upon which I mount a roller or projection for resting upon the
incline of the said lever acted upon by the expanding bar I also attach a pin or
projection to a part of the said bar or rod farther from the tap than that at which
the other projection or roller is situated and I form an inclined part upon the back
of the said lever terminating in a notch rest or recessed part at a higher level than
the inclined resting part at the front of the said lever for the other projection or
roller. When the tap is turned on the pin or projection which is the farther from
the tap acts upon the inclined part at the back of the said lever and presses the
said lever inwards until the said pin or projection comes opposite the notch or
recess or rest when it rests thereon or engages therewith. When the rod expands
by the heat of the flame the lower end of the said lever is moved inwards so that
the pin or projection which rested in or on the rest notch or recess at the back
thereof is released therefrom and the other projection or roller then falls onto and
rests upon the incline at the front of the said lever ready to cause the automatic
turning off of the Gas supply should the flame- be accidentally extinguished as
explained in the Specifications of the aforesaid prior Patents.
TL 10th day of T1001
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, London, W.C.,
Agent for the said John William Plunkett.

page_text: I The Honorable JOHN WILLIAM PLUNKETT of Dunstall Priory near Sevenoaks
in the County of Kent and of 15 Park Square Regents Park in the County of
Middlesex, do hereby declare the nature of said invention for "IMPROVEMENTS IN
SAFETY APPARATUS FOR GAS BURNERS," 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 safety apparatus for Gas Burners of the description
constituting the subject matters of Letters Patent N° 643 A.D. 1882 N° 6142
A.D. 1882 and N° 2803 A.D. 1883 and it has for its object to provide a simple
means for enabling the gas tap to be maintained in its open position without being
held by the hand until the expanding bar constituting the acting part of the safety
apparatus has become heated and expanded sufficiently to move a lever into a
position to maintain the tap open in such a manner that it will be automatically
closed should the gas flame be accidentally extinguished.
1.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purposo shall refer to
the several figures on the annexed sheet of drawings the same letters of reference
indicating corresponding parts in all the figures.
Figures 1 and 2 represent in elevation as seen from opposite sides of a gas
burner fitted with safety apparatus constructed according to my present Invention-
A represents the gas burner and B the tap, the plug of which is provided with a.
rod bar or lever handle C carrying a projection D (preferably provided with a
roller) and a projection E (which may also be provided with a roller if desired) for
the purpose hereinafter described-F is the lever acted upon by the expanding
bar & in the manner described in the Specifications to Letters Patent hereinbefore
referred to The said lever F is centred at f to the frame H and is provided on one
side of its lower part with an inclined surface f' and on the opposite side with a
notch or recess f³.
"
In raising the lever handle C into the position shewn by the full lines in
Figure 1. for the purpose of opening the Gas tap the pin or projection E which is
farther from the tap than the roller D acts upon the inclined part ft on the lever F
and presses the said lever inwards until the pin or projections E comes opposite the
notch or recess f³ and engages therewith so that it is supported thereby-The
lever F is centered so that its centre of gravity is such that when in its normal
position it ensures the engagement of its said notch with the said pin or projection-
The gas is then lighted when the rod G will expand by the heat of the flame and
by pressing against the upper end of the lever F cause the lower end of the said
lever to move inwards so that the pin or projection E rosting in or engaged with
the notch or recess f³ is released therefrom and the projection or roller D be caused
to rest upon the inclined surface f2 as shewn by the dotted lines in Figure 1 so as
to maintain the gas tap open whilst the gas remains ignited.
Should the flame be accidentally extinguished the bar G will immediately
contract and allow the upper end of the lever F to move inwards so that the lower
end of the said lever moves outwards clear of the roller or projection D (into tho
position shewn by the dotted lines in Figure 2) and allows the lever handlo C to
fall and turn off the gas supply by closing the tap.
The projections D and E will of course be so relatively placed that when the
lever F clears the projection D on the gas being accidentally extinguished it will not

page_text: engage with the projection E-The lever C will be used as the tap handle a special
handle for turning on the tap being unnecessary.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is,
In safety apparatus for Gas burners of the class herein before described the
combination with an expanding rod or bar of a lever having double inclines ƒ ƒ^
and a notch or recess fs and a lever handle C connected to the gas tap and having
projections D and f the whole being arranged to operate under the conditions
substantially as and for the purpose herein before described and illustrated in the
accompanying drawings.
Dated the 10th day of Santambor 1901