Improvements in or connected with Miners' Safety Lamps.
Year: 1897

page_text: Date of Application, 29th Oct., 1897
.Complete Specification Left, 25th Aug.. 1898-Accepted, 1st Oct., 1898
PROVISIONAL SPECIFICATION.
Improvements in or connected with Miners' Safety Lamps.
We, WILLIAM ACKROYD, of Ripon, Colliery Proprietor, and WILLIAM BEST,
of Morley, Engineer, both in the County of York, do hereby declare the nature
of this invention to be as follows:-
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The object of this invention is to construct miners safety lamps in such a manner
that the absence of the requisite gauze or gauzes may be instantly detected, it
being impossible to lock the lamp unless the gauze or gauzes have been placed in
position.
According to our invention, and referring particularly to a single gauze lamp, we
employ a gauze having a flange on its lower end which is held between the glass
and the lamp frame by the pressure of the glass which is kept up by a following-up
ring. The following-up ring is formed with left hand screw which is sufficiently
deep to allow it to follow the glass up until the latter is tight. The lamp bottom
is provided with a right hand screw which enables it to be screwed into the base
of the lamp frame, and the said lamp bottom is formed with a shoulder for limiting
its movement within the frame. The lamp bottom is formed with a spring catch
or lock, which engages with a rack or projection situated on the under side of the
following-up ring, and the engagement of the said lock only takes place during
the last upward movement of the lamp bottom.
Should the gauze be omitted when the lamp is put together, the following-up
ring carries the glass beyond its normal position up to the seat in the frame; and
when the lamp bottom is screwed into the base of the frame the spring lock does
not engage with the following-up ring owing to its distance from the lamp
bottom. On the other hand, should the correct gauze be placed in the lamp, the
following-up ring is tight when it arrives in its normal position, and on the lamp
bottom being screwed on, the locking takes place in the ordinary way.
In cases where two or more ganzes are employed, the absence of one or more
of them is at once detected.
Improvements in or connected with Miners' Safety Lamps.
We, WILLIAM ACKROYD, late of Ripon, but now of Birkenshaw, Colliery
Proprietor, and WILLIAM BEST, of Morley, Engineer, all in the County of York,
do hereby declare the nature of this invention and in what manner the same is to
[Price 8il.]:

page_text: be performed, to be particularly described and ascertained in and by the following
statement: -
The object of this invention is to construct miners' safety lamps in such a
manner that the absence of the requisite gauze or gauzes may be instantly
detected, it being impossible to lock the lamp unless the gauze or gauzes has or
have been placed in position.
In order that our invention may be clearly understood, we will proceed to
describe same with reference to the accompanying drawing, in which similar letters
refer to like parts in both of the figures.
Figure 1 is a sectional elevation of a lamp constructed according to our invention,
shewing the gauze in position, and Figure 2 is a similar view shewing the same
lamp with the gauze removed.
According to our invention, and referring particularly to a single gauze lamp,
we employ a gauze A having a flange B which is held between the glass C and
the lamp frame F by the pressure of a following up ring D. E is a left hand screw
thread cut on the exterior of the ring D, and the portion of the ring D, carrying
the thread E is sufficiently deep, not only to enable the glass to be pressed home
against the flange B, but for the glass to be carried up against the frame F in
the case of the gauze having been omitted. G is the lamp bottom which is secured
to the frame F by means of a right hand thread H, and J is a shoulder on the
lamp bottom G, which limits the distance to which the lamp bottom G can be
screwed into the frame F. K is a rack on the under side of the following up
ring D, and L is a spring bolt which engages with the rack K, when the lamp
bottom G is nearly screwed home.
When the gauze A is inserted in the lamp frame F, and the glass C is firmly held
up to the flange B by means of the following up ring D, the lamp is ready and
safe for the reception of the lamp bottom G; and on the latter being screwed
home the spring bolt L runs over the teeth of the rack K, thereby firmly securing
the parts together and locking the lamp (as seen at Figure 1).. However, if from
carelessness or from other cause, the gauze A has been omitted (as seen at
Figure 2), the following up ring D carries the glass C up to the frame F, and in
so doing it rises above its normal position; consequently when the lamp
bottom G is screwed home, the shoulder J comes into contact with the base of the
frame F and prevents the lamp bottom G rising sufficiently to enable the spring
bolt L to engage with the rack K, thus effectually preventing the lamp
becoming locked.
It will be readily seen that the thickness of the flange B determines the height
to which the glass C can be raised by means of the following up ring D, and in the
case where two or more gauzes are employed each having a separate flange, the
absence of one of the gauzes can be at once detected.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:-
1. The gauze A having a flange B on same, in combination with the glass C,
following up ring D, and means for locking the lamp bottom G to the ring D,
substantially as and for the purposes set forth.
2. The combination of the gauze A, flange B, glass C, following up ring D,
left hand screw thread E, frame F, lamp bottom G, right hand screw thread H,
shoulder J, rack K, and spring bolt L, substantially as and for the purposes set
forth.