Improvements in or connected with Miners' Safety Lamps.
Year: 1896

page_text: Date of Application, 26th Oct., 1896
Complete Specification Left, 24th July, 1897-Accepted, 16th Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in or connected with Miners' Safety Lamps.
We, WILLIAM ACKROYD, of The Crescent, Ripon, Colliery Proprietor, and
WILLIAM BEST, of Wesley Street, Morley, Engineer, both in the County of York,
do hereby declare the nature of this invention, to be as follows:-
The object of our invention, is to so improve the construction of miners safety
lamps, that the parts of same are more securely held in position, thus preventing
possible leakage at the joints; and our invention also refers to means whereby the
conductor for electrically lighting the lamps, may be readily adjusted over and
from the wick.
According to our invention, we provide the following up ring of the lamp with
a left hand screw thread, which takes into a female thread situated in the lamp
frame, and the lower edge of the said following up ring is fitted with a flange
which may suitably hold an elastic washer. The underside of the ring is formed
with rack teeth on same, for engaging with the locking bolt which passes through
the lamp bottom, and the said lamp bottom is provided with the ordinary right
handed screw thread for screwing same to the lamp frame.
The gauze and glass are first placed in position in the lamp frame, when the
following up ring can be screwed home, and then on screwing the lamp bottom up
to its seat, the locking bolt runs past the rack teeth and takes a firm hold behind
one of them, thus securely locking the lamp. An attempt to unscrew the lamp
bottom only tends to fasten the following up ring more tightly to the frame, and
the flange on the said ring holds the elastic washer firmly against its seat, thus
preventing leakage at the joints.
In order to enable the conductor for electrically lighting the lamp wick to be
placed in the most favourable position for lighting and also to obviate the said
conductor impairing the quality of the light after the lamp is lit, we provide
the said conductor with a head at the base, which enables same to be turned on
its pivot and to be thus withdrawn from contact with the light after the lamp has
been electrically lighted.
Dated this 26th day of October 1896.
improvements in or connected with Miners' Safety Lamps.
We, WILLIAM ACKROYD, of The Crescent, Ripon, Colliery Proprietor, and
WILLIAM BEST, of Wesley Street, Morley, Engineer, both in the County of York,
[Price 8d.]

page_text: 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 our invention, is to so improve the construction of miners safety
lamps, that the parts of same are more securely held in position, thus preventing
leakage at the joints; and our invention also refers to means whereby the
conductor for electrically lighting the lamp may be readily adjusted over and
fiom the wick.
In order that our invention may be clearly understood we w
will proceed to describe
same with reference to the accompanying drawing, in which similar letters refer
to like parts in both the figures.
Figure 1 is a sectional elevation of a lamp constructed according to my inven-
tion, and Figure 2 is an inverted plan of a portion of same.
A is the following up ring of the lamp with a left hand screw thread B on
same, which takes into a female thread C situated in the lamp frame D. E is a
flange which is provided on the ring A, and F are rack teeth situated on the under
side of the ring A. Gis a locking bolt which passes through the lamp bottom K,
and which is kept upwards by a spring H, and the said bolt G may be withdrawn
when required by means of a magnetic unlocking apparatus. L is a right hand
screw on the lamp bottom K, and the said screw L takes into a female thread M
situated in the frame D.
The glass N is first placed in position in the lamp frame 1, when the following
up ring A may be screwed up against the bottom of the said glass N, by screwing
the left hand thread B into the thread C of the lamp frame. The lamp bottom K
can now be screwed into position by means of the right hand lever L being
screwed into the thread M on the lamp frame, and the locking bolt G running past
the rack teeth F takes a firm hold behind the last tooth of the said rack over
which it has travelled on the tightening of the lamp bottom to the frame D.
An attempt to unscrew the lamp bottom K without first withdrawing the bolt G
from the rack teeth F, only tends to tighten the ring A more firmly against the
glass, and on the lamp bottom being screwed to the right a second time the slack
is taken up by the bolt G travelling over some extra teeth F on the rack. Should
an attempt be made to undo the lamp by breaking the glass N, the flange E
effectually prevents the removal of the ring A.
For
In order to enable the conductor P for electrically igniting the lamp wick, to be
placed in the most favourable position for lighting, and also to prevent the said
conductor impairing the quality of the light after the lamp is lit, we mount the
said conductor l' in the insulated material in the lamp bottom K in such a
manner that it may be turned to or away from the wick tube T as desired.
this purpose the base of the conductor l' is provided with a milled head R, and the
.said conductor l' is carried in a non-conducting tube S. When the conductor P
is in the position shewn in dotted lines at Figure 1, it is in the best position for
igniting the lamp wick, but when the said wick is lighted the point of the con-
ductor P would injure the light given by the flame of the wick if it remained
in this position. The milled head R is consequently turned, thus removing the
point of the conductor P from above the wick and allowing the flame to burn
freely.
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 following up ring provided with a screw thread running in the opposite
direction to that of the screw thread of the lamp bottom, the said ring and lamp
bottom being fastened together by a bolt or other suitable fastening, substantially
as and for the purposes set forth.

page_text: 2. The following up ring A provided with a left hand thread B and flange E,
substantially as and for the purposes set forth.
3. The following up ring A, having screw thread B, flange E and rack teeth F
on same, in combination with the lamp bottom K having a spring bolt G, and
the frame D, substantially as and for the purposes set forth.
4. ue conductor P provided with a milled head R at the base of same,
substantially as and for the purposes set forth.
Dated this 24th day of July AD 1807
BREWER & SON,
London and Leeds, Agents for the Applicants.