Improvements in Safety or Miners Lamps.
Year: 1886

page_text: Improvements in Safety or Miners Lamps.
I, JAMES LAIDLER of 82 New Elvet in the City of Durham, in the County of
Durham Engineer do hereby declare the nature of my invention for IMPROVE-
MENTS IN SAFETY OR MINERS LAMPS, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement
My invention has for its object improvements in safety or miners lamps and
refers more particularly to lamps of the Davy type.
A safety or miners lamp constructed according to this invention, has an external,
moveable metallic case, surrounding the upper part of the gauze, which protects it'
from injury or dirt this case terminates in a domed top to which a ring and handle
are attached, by which the lamp is carried.
Holes are provided near the top of the case for the exit of the products of:
combustion.
The lower part of the moveable case is formed of a screw ring which is rivetted
to the case..
The lower part of the gauze is protected by a glass cylinder, surrounded at the
top by a screw ring into which the moveable case is screwed and locked by means
of improved lead lock. which consists of a projection on each of the screw rings
before mentioned which projections when the rings are screwed together come
opposite to each other.
"
A hole is drilled through each of these projections through which is placed a
small tube and through the tube a lead rivet.
The glass cylinder rests upon a ring, which ring is connected with the upper
screw ring by means of three poles which protect the glass cylinder from injury.
This lower ring is provided with a number of holes through which the air passes
for the support of combustion and on the inside, it is provided with a perforated
ring, which when moved round by means of the stud attached to it, covers up the
holes for the inlet of air and thus extinguishes the flame Into this lower ring is
screwed the oil vessel which is locked to it by means of lead rivet, screw or other
kind of lock.
Figs. 1 and 2 of the accompanying drawings illustrate in elevation and vertical
section an arrangement of safety or miners lamp according to this invention
The base I of the lamp forms the reservoir for oil or spirit.

page_text: The bottom ring II, into which the reservoir I is screwed and locked has a
number of holes A through which air passes for the support of combustion, the
plan and elevation of which are given in Figs. 3 and 4. Figs. 5 and 6 shew the
plan and elevation of inner ring III, which is a moveable ring acting like a hit and
miss ventilator, by means of which the supply of air is cut off and the flame
extinguished.
It is moved round by means of stud IV and is perforated by holes B which when
open come opposite holes A in ring II.
Inside of ring II is screwed a ring VI, to which is attached gauze V.
Around the lower part of gauze V is a glass cylinder VII, surrounding which is
a frame composed of three poles IX which are fastened into bottom ring II and
top ring VIII.
Into top ring VIII is screwed ring X thus securing glass cylinder VII.
The upper part of the gauze V is protected by a metallic case XI which is
rivetted to glass ring X, having boles E in the upper part for the exit of the
products of combustion.
The domed top XII with ring & handle XIV are rivetted to cylinder XI.
The glass ring X is locked to screw ring VIII by an improved lead rivet
lock XIII, which consists of a brass or other metallic tube D which is passed
through the upper part and about two thirds of the lower part of lock XIII,
through which is passed a lead rivet C.
A lamp constructed according to this invention possesses several advantages over
the Davy Lamp and other lamps of that type.
Amongst these advantages may be mentioned the following:
1. It is lighter and more compact than the ordinary Davy Lamp placed in a
tin can.
2. The top of the case is more readily removed to examine the gauzes or remove
the glass.
3. As the lead lock used in this lamp is much stronger than those in ordinary
use, it cannot be cut in two by forcibly unscrewing the case of the lamp.
4. It is easily extinguished by means of a moveable ring which cuts off the
supply of air.
This lamp may be used with or without the extinguisher.
Having now particularly described the nature of my said invention and in what
manner the same has to be performed, I declare what I claim, is providing a safety
or miners lamp with the following novelties and improvements :—
1. In arrangement of bottom ring for the inlet of air to support combustion.
2. In arrangement of moveable ring for shutting off the supply of air.
3. In the arrangement for removing the glass without interfering with, or
removing the oil vessel.
4. In the arrangement of lead lock which locks the upper part of the lamp to the
lower,
In witness whereof I the said James Laidler have hereunto set my hand and