Improvements in or applicable to Miners' and other Safety Lamps.
Year: 1893

page_text: Date of Application, 21st Feb., 1893
Complete Specification Left, 4th Oct., 1893-Accepted, 28th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in or applicable to Miners' and other Safety Lamps..
I JOSEPH PRESTWICH of Irwell Park, Eccles near Manchester, in the County
of Lancaster, Manager, do hereby declare the nature of this invention to be as
follows:-
The objects of this invention are to cheapen the cost of manufacture of miners'
and other safety lamps, and to prevent the user from opening or tampering with
the lamps without putting out the light.
In the first place I provide an oil container with a top or cover fixed or cast
complete thereon, the oil being fed thereto from the outside as shewn and described
in the Specification of Letters Patent No. 8007 dated April 28th 1892.
A circular flange is fixed or formed upon the top of the container to receive the
bottom of the glass cylinder or tube and the pillars supporting the upper ring are
also fixed to the container. This upper ring is perforated to admit air to the lamp
and is chased with an internal screw into which fits a ring which screws down upon
a second ring supporting the gauze top or chimney of the lamp, and resting upon
the glass cylinder or tube, at the top and bottom of which are placed rings of
india rubber or similar material to make the joints air and gas tight.
The screwed ring above described will thus (when screwed down into its place)
hold the lamp together.
The top or cover of the container. is provided with a fixed wick tube and with a
regulating plate carrying an outer tube and moved by a spindle passing through
the container and provided with a screw at its upper end which fits in a thread cut
in the regulating plate in the usual way. This regulating plate also carries the
electric terminals and wire for lighting the lamp when put together.
In order to lock the lamp a locking plate covering the feed opening and similar
to that described in the above named Letters Patent is used.
This locking plate comes beneath, and retains in place a long vertical bolt passing
from the top of the container through the upper fixed ring and preferably sliding
on one of the pillars; the said bolt when the screwed ring is down on the gauze or
chimney support and the glass cylinder or tube, comes up immediately behind a
peg or projection on the outside of the said screwed ring and prevents it from being
turned back and unscrewed, until the leaden rivet of the locking plate has been.
destroyed.
If preferred the bolt can be cranked and lock against a projection on the outer
top cover of the lamp instead of or in addition to locking the screwed ring as
above described; and this bolt may act upon a lever the other end of which raises.
or otherwise applies an extinguisher.
In some cases the regulating plate above named may be made with notches or a
flanged edge so that it can be caught by two or more light spring or other catches
depending from the gauze or chimney supporting ring or the regulating plate can.
be otherwise connected to the said ring so that the latter can not be lifted from the
lamp without disengaging the regulating plate from its screw which can be made
long enough to prevent the gauze top or chimney from being lifted off without
extinguishing the light.
This combined regulator and extinguisher can be used in other forms of lamp,
with either flat or round wicks.
Or an extinguishing plate and tube can be used above and outside the regulating
plate and depending by hinged rods from half rings clipping the gauze or chimney
supporting ring and held in place by the screwed ring; the rods pass through
notches in the upper fixed ring.

page_text: The extinguishing plate in this case also carries the glass cylinder and the
electric terminals and thus when the screwed ring has been removed and the gauze.
top is raised it carries with it the glass cylinder and the extinguishing plate and
tube the rods of which being hinged at the bottom and being held in the notches in
the fixed upper ring cannot be separated until the plate has been drawn up high
enough to put out the light.
Dated this 20th day of February 1893.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.
:
COMPLETE SPECIFICATION.
Improvements in or applicable to Miners' and other Safety Lamps.
I JOSEPH PRESTWICH of Irwell Park Eccles near Manchester in the County
of Lancaster, Manager, 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 objects of this invention are to cheapen the cost of manufacture of miner's
safety lamps and to prevent the miner from opening or tampering with the lamp
without putting out the light.
My invention will be readily understood from the following description on
reference to the accompanying drawings.
On Sheet 1 Fig. 1 is an elevation partly in section of a miner's safety lanıp made
according to my invention.
Fig. 2 is a similar view of a modification Fig. 3 is a horizontal section through
about the line A-B on Fig. 2.
Figs. 1A, 1B, and 2 show details hereafter more particularly referred to.
On Sheet 2 Fig. 4 is a sectional clevation showing a modified form of lamp and
Fig. 5 is a plan view of the upper fixed ring d and half rings hereafter
described.
In the first place I use an oil container a with a top or cover a fixed or cast
complete thereon the oil being fed thereto from the outside as shewn and described
in the Specification of Letters Patent No. 8007 dated April 28, 1892.
A circular flange a² is fixed or formed upon the top of the container a to receive
the bottom of the glass cylinder or tube b and the pillars c supporting the upper
ring d are also fixed to the container a. This upper ring d is perforated to admit
air to the lamp and is chased with an internal screw into which fits a ring e which
screws down upon a second ring f supporting the gauze top g of the lamp, or a
flange in the gauze top itself, and resting upon the glass cylinder or tube 6 at the
top and bottom of which are placed rings 6' of india rubber asbestos or similar
material to make the joint air and gas tight.
The screwed ring e above described will thus (when screwed down into its place)
hold the lamp together.
It is fixed to the outside cover e¹ of the lamp as seen at Fig. 1 or to pillars e²
supporting the hook or ring e³ for suspending the lamp as shewn at Fig. 2.
The top or cover a¹ of the container a is provided with a fixed wick tube a³ and
with a regulating plate carrying an outer tube and moved by a spindle h²
passing through the container and provided with a screw at its upper end which
fits in a thread cut in the regulating plate in the usual way. This regulating
plate also carries the electric terminals i and and wire for lighting the lamp
when put together.
In order to lock the lamp, a locking platek see Figs. 1 2 and 3 covering the feed
opening and similar to that described in the above named Letters Patent is used.
This locking plate k comes beneath, and retains in place a long vertical bolt
see Figs. 14 and 1B, passing from the top of the container a through the upper
fixed ring d and preferably sliding on one of the pillars c; the said bolt when the

page_text: screwed ring e is down on the gauze or chimney support and the glass cylinder or
tube b, comes up immediately behind a peg arm or projection ex on the outside of
the said screwed ring e and prevents it from being turned back and unscrewed, until
the leaden rivet k' of the locking plate & has been destroyed.
If preferred the bolt can be cranked and lock against a projection on the outer
top cover e¹ (see Fig. 1) of the lamp instead of or in addition to locking the
screwed ring e as above described; and this bolt may act upon a lever the other
end of which raises or otherwise applies an extinguisher.
In some cases the regulating plate / above named may be made with notches /*
see Figs. 2 and 3 or a flanged edge see Fig. 24 so that it can be caught by two or
more light spring or other catches m depending from the gauze or chimney
supporting ring for the regulating plate can be otherwise connected to the said
ring so that the latter can not be lifted from the lamp without disengaging the
regulating plate from its screw 2 which can be made long enough to prevent the
gauze top or chimney from being lifted off without extinguishing the light.
This combined regulator and extinguisher can be used in other forms of lamp,.
with either flat or round wicks.
Or an extinguishing plate and tube (see Figs. 4 and 5) can be used above
and outside the regulating plate / and depending by hinged rods from half rings h
clipping the gauze or chimney supporting ring and held in place by the screwed
ringe; the rods pass through notches see Fig. 5 in the upper fixed ring d.
The extinguishing plate in this case also carries the glass cylinder 6 and the
electric terminals and thus when the screwed ring e has been removed and the
gauze top g is raised it carries with it the glass cylinder and the extinguishing
plate and tube *, the rods hs of which being hinged at the bottom at * and being
held in the notches x in the fixed upper ring d cannot be separated until the
plate has been drawn up high enough to put out the light.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The general construction and arrangement of electrically lighted miner's
safety lamp substantially as herein before described and illustrated by the annexed
drawings.
2. In a miner's safety lamp the combination of the oil container to which are
fixed the pillars supporting a fixed ring, with a screwed ring for holding the glass.
tube and the gauze-or chimney in place substantially as hereinbefore described and
illustrated by the annexed drawings.
3. In a miner's safety lamp the combination of the sliding bolt, the upper fixed
ring and the screwed ring provided with arms or projections, the said bolt being
held up by a suitable locking plate to bolt the two rings together substantially as
herein before described and illustrated by the annexed drawings.
4. The combined regulating and extinguishing plate constructed and operating
substantially as hereinbefore described and illustrated by the annexed drawings.
5. The combination with the regulating and extinguishing plate of spring or
other arms depending from the gauze or chimney so that by raising the latter the
light will be extinguished substantially as hereinbefore described and illustrated by
the annexed drawings.
6. The combination by a regulating plate and tube of an extinguishing plate and
tube so connected to the gauze or chimney that it will be raised thereby and the
light extinguished before the lamp can be taken asunder substantially as herein-
before described and illustrated by the annexed drawings.
Dated this 30th day of September 1893.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.