Improvements in Miners' and like Safety Lamps.
Year: 1898

page_text: Improvements in Miners' and like Safety Lamps.
We, ALBERT EDWIN HOLBROOK, of Holly House, Brynteg, Mining Contractor,
and JOHN FRANCIS HARDING, of 33, Castle Street, Miner, both of Abertillery,
in the County of Monmouth, do hereby declare the nature of this invention
to be as follows:-
-
This invention consists of improvements in miners' and like safety lamps,
our object being to construct efficient lamps in such a manner that access cannot
be obtained to the interior or to the flame without unlocking the padlock or
other fastening.
In the construction of a lamp in accordance with our invention we dispense with
the ordinary screw joints between the various parts and instead of same we
employ bayonet joints for securing such parts together. Thus we connect the
fount or lamp reservoir with the frame or central part of the lamp by means
of a bayonet or like joint or fastening, and we employ a similar joint for
securing the upper part of the frame with the shield or bonnet. The guard
plate for keeping the glass tube in position is also secured by a bayonet joint
fastening.
The wires or bars on the exterior of the glass for the protection of same are
secured at their lower ends to the lower part of the complete frame, by rivetting
over their reduced extremities, but at the upper end the bars are secured to
the frame by small cottar pins passing through apertures in their extremities,
suitable slots being formed for the reception of such pins; we sometimes also
employ cottar pins for the lower ends of the rods. By this method of securing
the wires or bars we are enabled to prevent removal or displacement of the
same for the obtaining of unauthorised access to the interior of the lamp or
to the flame, as can be accomplished with bars which are secured in position in
the ordinary manner. With our lamp no access can be obtained to the interior
when the lock or fastening between the frame and the fount or reservoir is
secured.
The burner cap or cover is secured in its position in the interior of the
lamp by means of a bayonet joint.
For the purpose of keeping cool the wire gauze chimney within the shield
or bonnet, we form apertures at the lower end of the bonnet and within the
same we fit a sleeve which serves to direct the air, coming in by way of the
slots, up through the annular space between the hood and gauze at the upper
part of which it is discharged through the top apertures in the hood.
Dated thin 00th
TA
1000

page_text: Improvements in Miners' and like Safety Lamps.
We, ALBERT EDWARD HOLBROOK, of Holly House, Brynteg, Mining Contractor,
and JOHN FRANCIS HARDING, of 33, Custle Street, Miner, both of Abertillery,
in the County of Monmouth, 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:―
This invention consists of improvements in miners' and like safety lamps,
our object being to construct efficient lamps in such a manner that access cannot
be obtained to the interior or to the flame without unlocking the padlock or
other fastening.
In the two accompanying sheets of explanatory drawings to be hereinafter
referred to:-
Figure 1 is an elevation with part in section of a miners' safety lamp con-
structed in accordance with our invention.
Figure 2 is an elevation with part in section showing the method of locking
the oil fount or lamp reservoir to the central part of the lamp.
Figure 3 is a sectional elevation showing the connection of the wire gauze
chimney with the central part of the lamp
Figure A is a plan of the base of the frame or central part of the lamp.
Figure 5 is a plan of the oil fount or lamp reservoir.
Fi
Figure 6 is a plan of the upper portion of the frame or central part of the lamp.
Figure 7 is a sectional plan of the bonnet C on the line c d Figure 1.
Figure 8 is a plan of the guard plate.
The same reference letters in the different views indicate the same parts.
In the construction of a lamp in accordance with our invention we dispense with
the ordinary screw joints between the various parts and instead of same we employ
bayonet joints for securing such parts together. Thus we connect the fount
or lamp reservoir A with the base B of the frame or central part of the lamp
by means of a bayonet or like joint or fastening, and we employ a similar joint
for securing the upper part B¹ of the frame with base C₁ of the shield or bonnet C.
The guard plate D for keeping the glass tube E in position is also secured
by a bayonet joint fastening.
The wires or bars as F on the exterior of the glass E for the protection of
same are secured at their lower ends to the base B of the frame or central part
of the lamp by rivetting over their reduced extremities, but at the upper end
the bars are secured to the part B' of the frame by small cottar pins as fa
passing through apertures in their extremities, suitable slots being formed for
the reception of such pins; we sometimes also employ cottar pins for the lower
ends of the rods. By this method of securing the wires or bars F we are
enabled to prevent removal or displacement of the same for the obtaining of
unauthorized access to the interior of the lamp or to the flame, as can be 4
accomplished with bars which are secured in position in the ordinary manner.
With our lamp no access can be obtained to the interior when the lock or
fastening between the frame and the fount or reservoir is secured.
The burner cap or cover G is secured in its position in the interior of the
lamp by means of a bayonet joint.
For the purpose of keeping cool the wire gauze chimney H within the shield
or bonnet C, we form apertures as c at the lower end of the bonnet and within
the same we attach a sleeve J which serves to direct the air, coming in by way,

page_text: of the slots, up through the annular space between the hood and gauze at the
upper part of which it is discharged through the top apertures c¹ in the hood.
We lock the shield or bonnet C to the frame or central part of the lamp by
making one of the protecting wires or bars with free ends, and of sufficient
length to enable its upper end to engage with the base C¹ of the bonnet when
the front or lamp reservoir A is in its position; F1 (Figure 1) represents such
a locking bar. When the fount is detached from the lamp, the bar F¹ will drop.
down sufficiently to effect disengagement with the shield or bonnet.
We preferably lock the fount or lamp reservoir A in position by means of a
spring lock bolt or pin as a¹ arranged to engage with an aperture a³ in the
base B of the frame or central part of the lamp. The unlocking or withdrawal
of the bolt is effected by the application of a magnet of sufficient power to
overcome the resistance of the spring.
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:-
1. The improved construction of miners' and like safety lamps preventing
unauthorised access to the interior or to the flame, substantially as described.
2. The arrangement and combination of parts constituting the improved
miners' or like safety lamp substantially as described and as illustrated.
1 1
01
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicants.