Improvements in Miners' Safety Lamps.
Year: 1892

page_text: Date of Application, 29th Apr., 1892-Accen'ed, 28th May; 1892
COMPLETE, SPECIFICATION.
Improvements in Miners' Safety Lamps.
We JOSEPH PRESTWICH of 8 Irwell Park Eccles in the County of Lancaster,
Agent, and THE PROTECTOR LAMP AND LIGHTING COMPANY LIMITED, also
of Eccles in the said County Lamp Manufacturers, 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 :—
The object of this invention is to provide a ready means of locking such lamps
and of refilling the oil cistern thereof without taking the lamp to pieces.
The nature of the invention and the manner in which the same is to be performed
or carried into practical effect will be readily understood on reference to the
annexed sheet of drawings and the following explanation thereof.
Fig. 1 on the drawings is a plan view and Fig. 2 a vertical section of the oil
cistern and bottom ring of a miner's safety lamp, Figs. 3 and 5 are vertical
sections and Figs. 4 and 6 partial plan views of modifications of the same.
Fig. 7 is a plan view and Fig. 8 a face view partly in section of another modi-
fication thereof.
a is the oil cistern of the lamp, and the bottom ring to which the pillars
surrounding the glass cylinder are attached.
The invention consists principally in casting or soldering onto the cistern "
outside its circumference, a pocket c which serves as an inlet for feeding the same
with oil. The bottom of this pocket has an opening & communicating with the
inside of the cistern and the top thereof is closed by means of a lid or cover which
at the same time serves as a lock to prevent the opening of the lamp.
Various simple forms of lid or cover answering the purpose also of a lock might
easily be devised four of which are illustrated on the annexed drawings.
In Figs. 1 and 2 the top of the pocket c is made with a flange e the top of which
comes level with the flange at the top of the ring when the cistern is screwed on.
To this is hinged a lid or coverfformed with a projection g.
The flange e and the lid or cover fare provided with corresponding holes
whereby when the cistern has been filled and the cover closed as drawn at Fig. 1,
the two can be secured together by means of a lead rivet, screw, or padlock, the
projection 9 coming over the ring b and preventing the lamp from being unscrewed
without breaking rivet, or unlocking. The dotted lines on Fig. 1 show the position
of the lid when refilling.
On Figs. 3 and 4 the ring 6 has a lug or a flange i cast to it which comes over
the flange e and covers the feed pocket c when the cistern is screwed on, and is
secured by two rivets as shewn at Fig. 4.
At Figs. 5 and 6 the inside of the feed opening is screwed, and it is closed by
means of the screw plug k the milled head of which comes over the ring b and so
locks the lamp.
The head of the screw plug k is provided with several holes for rivetting as seen
at Fig. 6.
A leather or other washer should be placed between the milled head and the top
of the flange e to make a good joint.
In some cases also we propose to fit a conical or other suitable plug k¹ into the
upper end of the pocket c as shewn at Figs. 7 and 8. This plug is held in place by
the cover which at the same time locks the ring as before described, and we
prefer to provide the plug ¹ with a short stem or spindle by which it can be
attached by a chain or other means to the lamp to prevent it from being lost when
removed for filling the oil reservoir or cistern. The cover ƒ is in this case notched
as shewn in order to work past this stem or spindle ³.

page_text: Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is :-
The combination with the oil cistern of a safety lamp of a filling pocket cast or
soldered outside the circumference and closed at the top with a lid or cover which 5
at the same time answers the purpose of locking the lamp substantially as herein-
before described and illustrated by the drawing annexed.
Dated this 27th day of April 1892.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.