An Improvement in Fire Extinguishers.
Year: 1898

page_text: Date of Application, 16th Apr., 1898
Complete Specification Left, 10th Jan., 1899-Accepted, 18th Feb.,
1899
An Improvement in Fire Extinguishers.
I,, FREDERICK HENRY CHEESEWRIGHT, of No. 10, Walbrook, in the City of
London, Consulting Engineer, do hereby declare the nature of this invention
to be as follows:-
My invention relates to fire extinguishers of the kind described in the Specifi-
cation No. 9239 of 1884.
Instead of breaking the bottle containing the acid by forcing down a pusher,
I employ a blow caused by a spring to effect the fracture.
For this purpose I pass through a stuffing box in the cover a sliding rod having
a handle by which it can be pulled up in opposition to a helical spring surround-
ing the rod.
When it is pulled up a certain height a spring trigger engages in a groove of
the rod and retains it in its elevated position. On releasing the trigger the
spring causes the rod to make a rapid descent so that a piece on the end of the
rod acts as a hammer breaking the glass. The piece on the end of the rod may
have some play and may be kept just out of contact with the bottle by a light
spring which on the discharge of the rod vields, allowing the momentum of the
piece to carry it forward to strike the bottle.
Dated this 16th day of April 1898.
ABEL & IMRAY,
Agents for the Applicant.
I, FREDERICK HENRY CHEESEWRIGHT, of No. 10, Walbrook, in the City of
London, Consulting Engineer, 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 relates to fire extinguishers of the kind described in the Specifi-
cation No. 9239 of 1884.
Instead of breaking the bottle containing the acid by forcing down a pusher,
I employ the blow caused by a spring to effect the fracture as I shall describe
referring to the accompanying drawings.
Fig. is an elevation of an extinguisher with part of the side broken away
and the central parts shewn in section. Fig. 2 is an elevation partly sectional
of the upper part shewing the handle pulled up.

page_text: Fig. 3 is a plan of the handle and catch trigger. Fig. 4 is a plan of a modified
form of catch trigger.
Through a stuffing box in the cover a I pass a sliding rod 6 having at its lower
end a cup c enclosing the head of the bottle, and having at its upper end a
handled by which it can be pulled up in opposition to a spring e to the position
shewn in Fig. 2.
When the rod is thus raised the blades of a spring trigger catch f engage in
a groove of the rod and keep it in its raised position with the spring compressed.
When it is desired to break the bottle, the operator by pinching the blades of
the trigger catch, disengages the rod which is caused to descend rapidly by the
spring, and the edge of its cup c strikes the shoulder of the bottle causing it to
break at its weakened part.
The modified form of trigger catch shown in Fig. 4 comprises a spring lever g
one arm of which engages in the notch of b. This lever carries a spring sliding
bolt h which engages in a catch piece k fixed on the cover a.
For releasing the rod b, the operator applying his finger to the bolt h, while
his thumb bears against the end of the lever g, withdraws the bolt and moves
the lever so as to withdraw its arm from the groove in the rod b.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
The construction and arrangement of spring rod and trigger catch for an
extinguisher substantially as described with reference to the drawings.
Total this 10th or of Tanum 1800
ABEL & IMRAY,
Agents for the Applicant.