Improvements in Appliances for Preventing Ignition of Gases in connection with Dynamos, Motors, or other Electrical Apparatus.
Year: 1891

page_text: Date of Application, 7th May, 1891
Complete Specification Left, 5th Feb., 1892-Accepted, 12th Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements in Appliances for Preventing Ignition of Gases in
connection with Dynamos, Motors, or other Electrical Apparatus.
We, FREDERICK JOHN ROWAN, of 121, West Regent Street, Glasgow, in the
County of Lanark, North Britain, and WILLIAM MC WHIRTER, of the Faraday
Electrical Works, Govan, in the same County, Electrical Engineers, do hereby
declare the nature of this invention to be as follows that is to say :-
Our said invention has for its object the better and more certain prevention
of the ignition of gases, such for example as fire damp in coal mines, in connection
with dynamos, motors or other electrical apparatus.
In carrying out our invention in the case of a dynamo or motor, we enclose the
same in a casing provided with one or more glazed windows for inspection of the
enclosed parts. Stuffing boxes or very closely fitting apertures are provided for
the passage of the main shaft, and of turning, rocking, or sliding spindles for
adjusting brushes or switches. And we prevent the presence of an inflammable
mixture of gases within the casing whilst the electrical apparatus is working, by
charging the interior with a sufficient quantity of carbonic acid gas such gas being
evolved electrolytically by the action of an electric current on any suitable
chemical. As examples of chemicals which can be used for the purpose the
following may be mentioned; namely oxalic acid, a neutral or alkaline oxalate of
potassium, acetate of potassium, any suitable acid of the fatty series, and a
potassium salt of any suitable fatty acid, such chemicals being employed in
solution. The casing may be made with an easily removable cover, luted when in
place by having its bottom edge dipping into liquid in a gutter extending round
the casing.
Dated this Sixth day of May 1891.
EDMUND HUNT,
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Appliances for Preventing Ignition of Gases in
connection with Dynamos, Motors, or other Electrical Apparatus.
We, FREDERICK JOHN ROWAN, of 121, West Regent Street, Glasgow, in the
County of Lanark, North Britain, and WILLIAM MC WHIRTER, of the Faraday
Electrical Works, Govan, in the same County, Electrical Engineers, 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, that is to say:-
Our said invention has for its object the better and more certain prevention of
the ignition of gases, such for example as fire damp in coal mines, in connection with
dynamos, motors or other electrical apparatus.
In carrying out our invention in the case of a dynamo, or motor, we enclose the
same in a casing provided with one or more glazed windows for inspection of the
enclosed parts. Stuffing boxes or very closely fitting apertures are provided for
the passage of the main shaft, and of turning, rocking, or sliding spindles for adjusting
brushes or switches. And we prevent the presence of an inflammable mixture of
gases within the casing whilst the electrical apparatus is working, by charging the
interior with a sufficient quantity of carbonic acid gas such gas being evolved
electrolytically by the action of an electric current on any suitable chemical.
rice 8

page_text: As examples of chemicals which can be used for the purpose the following may
be mentioned:-namely oxalic acid, a neutral or alkaline oxalate of potassium,
acetate of potassium, any suitable acid of the fatty series, and a potassium salt of
any suitable fatty acid, such chemicals being employed in solution. The casing
may be made with an easily removable cover, luted when in place by having its
bottom edge dipping into liquid in a gutter extending round the casing.
The cover or a part connected therewith is by preference arranged so that it
cannot be opened without disconnecting internal parts and thereby stopping action
within the casing. In the case of a dynamo, the part disconnected may be a clutch
on the driving shaft; whilst in the case of a motor a switch may be shifted or a
contact plug removed so as to stop the driving current.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The enclosing of dynamos, motors, or other electrical apparatus in casings
arranged to prevent the ignition of external gases, the interiors of such casings
being charged with carbonic acid gas, substantially as herein before described.
11002
EDMUND HUNT,
Applicants' Agent.