Year: 1886

page_text: Date of Application, 13th July, 1886
Complete Left, 9th Apr., 1887.
Complete Accepted, 10th May, 1887.
CHARLES ROBERT WHITTAKER, 96, Bury New Road Manchester Mechanic I do
hereby declare the nature of this invention to be as follows:-
I claim as patent in the first instance the double perforated shields "Metal" with
fusable Lead Ring, which is placed in the inside of Lamp Gauze, and which acts as
an extinguisher in case of Gas being fired inside of Shields and Gauze. The Shields
are made of two circular tubes "Metal" the one to fit inside the other and perforated
holes to admit air, and allow Vent for smoke from the burning light in the Lamp. The
inside Shield or tube is held in its proper position open with a fusable Lead Ring, until
the Gas operates upon the said ring, and allows the inside Shield to drop and close the
Vent, and put out the light in the Lamp and Gauze.
The second part of patent is an internal circular ratchet wheel, also steel spring
attached to bottom extinguisher with a nog at each end to fit the teeth in the said
ratchet wheel, and which prevents the light in lamp being got at, when once the
burner is screw'd into its proper place, i.e. the brass plate that holds the Lamp
Glass.
The third part of patent is an improved screw lock with lead attachment, which
may be stamped for security.
Fourth part is an improved Lamp bottom without spring attachment or internal
ratchet wheel, it being held secure by means of two metal pins, which enter two
Lslotts in the body of the Lamp, also secured by screw lock, and lead attachment,
which may be stamped for security.
CHARLES ROBERT WHITTAKER,
96, Bury New Road, Manchester.

page_text: I CHARLES ROBERT WHITTAKER of 96 Bury New Road Manchester Mechanic 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
My invention consists of in the first place two perforated Metal Shields one within
the other and both within the usual wire gauze cap. One of these shields is capable
of sliding vertically or revolving within or upon the other.
In the normal position the perforations coincide but upon a restraining lead wire or
ring being melted by the heat of firedamp or any gas burning within the gauze cap
the shields move by gravity or the action of a spring so as to extinguish all flame
or fire within them.
Another part of my invention is an arrangement of internal ratchet wheel and a
steel spring with teeth fixed to bottom extinguisher to prevent all access to the light
in the lamp when once the burner has been screwed into its proper place.
A third part of my invention is an improved hinge lock with lead attachment
which may be stamped for security.
A fourth part is a means of fixing and locking the lamp bottom by means of
Lslots in the lamp body.
This also is secured by a hinge lock and lead attachment which may be stamped
for security.
In the accompanying drawings,
Fig. I. is a cross section of the lamp.
Fig. II. is an outside elevation with the bonnet and gauze cap removed.
Fig. III. shews enlarged views of the fusible lead ring.
Fig. IV. is a sectional plan taken through the metal shields.
Fig. V. is a sectional plan taken through the oil vessel.
Fig. VI. is a skeleton section partly illustrating the second head of my invention.
Fig. VII. is a detached section of oil vessel as constructed under the second head
of my invention.
Fig. VIII. is an inverted plan of the internal ratchet wheel.
In all the views similar reference letters refer to the same parts.
a is an outer perforated metal shield fixed within the guaze e and b is an inner
metal shield with corresponding perforations.
Both shields are entirely closed by plates a¹ b¹ at the top and the inner shield as
shewn in Fig. I. has fixed within it the tube d. The wire e is fixed to the outer
shield and being notched at its lower end so as to leave a "T" shaped piece has the
ring shewn enlarged in Fig. III. inserted across it or suspended from it in such
a way as to hold up the tube d, and shield b. In this position the perforations in
the two shields coincide and the air circulates as shewn by the dotted arrows, but
upon exterior gas entering through the gauze and perforations the lead ring fis

page_text: melted and the shield d descends by gravity or by the action of the spring g, when
all ingress for oxygen or egress for flame or combustion products being cut off the
flame within the lamp is effectually smothered.
In Fig. VI. a modification is shewn in which the shield 6 is sustained by a lead
wire h which upon being melted a similar action ensues. The casting i forming the
bottom part of the lamp body has formed or fixed within it a circular ratchet k. In
Fig. VI the oil vessel and burner are not shewn in their place, and the right half
section shews the loose extinguisher formed of piece I screwed into plate m which
forms the bottom of sealed glass chamber, and having an internal quick threaded
screw. It also has attached to it the two spring arms which carry each one tooth o
which engage with the ratchet . In Fig. VII the lamp & burner are shewn in
place. It will be understood that when the Burner is to be screwed into its place the
extinguisher is first screwed on to the thread p, on the Burner. On the whole then
being screwed into plate m the teeth o pass over the ratchet teeth but in any attempt
to unscrew the burner the teeth engaging prevent any rotation and. consequently any
withdrawal of the extinguisher & the light is thus smothered as the burner recedes
down the tube of the extinguisher.
In Figs. II & V is a hinged door which carries a pin which falls in to the
slots & this prevents withdrawal of the Lamp Burner so long as q is locked as
shewn. Or a lead rivit may be used instead of the hasp t and a seal placed over it.
In Fig. VII. is shewn another plan of locking the. lamp. The pin u is long enough
to enter the recess sunk in the outside of the oil vessel and thus prevents it from being
screwed out. The hinge carrying this pin may be similarly locked or sealed.
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 :-
I. The perforated sliding or rotating shields restrained from closing & thus
smothering the light by a fusible piece of lead substantially as and for the purposes
hereinbefore described.
II. The internal ratchet and bottom extinguisher with spring arms and teeth
substantially as and for the purposes hereinbefore described.
III. The hinge lock in combination with L slots substantially as and for the purposes
hereinbefore described.
IV. The hinge lock in combination with recess substantially as and for the purposes
hereinbefore described.
Dated this 7th day of April 1887.