Improvements relating to Miners' Safety Lamps.
Year: 1894

page_text: Date of Application, 16th Aug., 1894
Complate Insaifination Laft 16th May 1805 Accented 10th Aug. 1895
PROVISIONAL SPECIFICATION.
Improvements relating to Miners' Safety Lamps.
1, THOMAS THOMAS, of 12, Ynyshir Road, Ynyshir, near Pontypridd, Miner
do hereby declare the nature of this invention to be as follows:-
1
In the Specification of my Patent No. 8136 of 1889, I have described certain
"improvements in miners shielded safety lamps," devised with a view to reducing
the risks from explosions; said improvements including amongst other features the
surrounding of the lamp gauze with inner and outer shields etc. together with
special arrangement of inlet and outlet passages for controlling the admission of air
and producing the velocity thereof. I have also described in said Specification a
particular automatic locking arrangement for the outer shield.
My present improvements have special reference to additional means which I
adopt in connection with the locking device for the lamp with a view to safeguard
against accidents arising from the tampering with miners safety lamps after once
being locked. To accomplish this I employ a lead rivet lock and what is known as
a "Ryders" reverse sliding bar, (that is one of the pillars which connect the top
part of the lamp to the bottom part of same). The lead rivet lock is stamped with
a private mark, letter or emblem, by means of stamping nippers or pincers, and the
stamps or marks may be changed as often as wished by the locker or official in
charge of the lamps, thereby ensuring the detection of the lamps when having been
tampered with or opened after once being locked and stamped.
Dated this 17th day of Iul 1804
V. LAZARUS,
1 Furnival Street, E.C., Agent for Applicant.
I, THOMAS THOMAS, of 12 Ynyshir Road, Ynyshir, near Pontypridd, Miner,
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:-
In the Specification of my Patent No. 8136 of 1889 I have described certain
improvements in miners shielded safety lamps devised with a view to reducing the
risks from explosions, said improvements including amongst other features the
surrounding of the lamp gauze with inner and outer shields &c. together with special
arrangement of inlet and outlet passages for controlling the admission of air and
reducing the velocity thereof. I have also described in said Specification a
particular automatic locking arrangement for the outer shield. My present
improvements-which I have illustrated in the accompanying sheet of drawings-
have special reference to additional means which I now adopt in connection with
the locking device for the lamp with a view to safeguard against accidents arising
from the tampering with miners' safety lamps after once being locked.
accomplish this, I employ a lead rivet lock and what is known in connection with
To
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page_text: miners' safety lamps as a "Ryders" reversed sliding bar (named after the inventor,
Ryder who made use of it sliding upwards to fasten the bonnet of the lamp whereas
I avail myself of it when slid downwards to fasten the bottom part of the lamp,
at a Figure 1). In the drawing, Figure 1 is an elevational view in part section
where indicated by the sectional lines shewing the herein before referred to reversed
Ryder's" sliding bar a taking into recess a¹ formed in bottom part of the lamp.
In this figure is also the cavity c formed in the base ring C and supporting ring D
for reception of lead rivet above referred to. Figure 2 is a vertical section of that
part of the lamp which includes the base ring C with a portion of the outer
shield A: the supporting ring D and the top part of the lamp glass G (these
several parts A, C, D and G having been referred to and will be found to be described
in the Specification of my previous Patent hereinbefore identified No. 8136 of the
year 1889). In Figure 2. b is the lead rivet. It is inserted in the cavity c afore-
said. The head 6' of the rivet is stamped with a private mark, initials or emblem
by means of nippers or pincers one of the jaws of which latter is formed with a
recess for the introduction therein-say by screwing of a small impressing die
bearing upon its face the particular pre-determined private mark. The responsible
mine official in charge of the pincers would also have a supply of the identifying
dies, which may be varied or altered as often as wished.
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 !
claim is :-
In miners' safety lamps, the employment as herein set forth of the lead rivet
lock b, b, c for the detection of and with a view to the prevention of the lamp being
tampered with after being "locked."
Dated this 16th day of May 1895
V. LAZARUS,
1 Furnival Street, Holborn, E.C., Agent for Applicant.