Improvements in Electric Safety Lamps for Use in Mines and other Places.
Year: 1895

page_text: Date of Application, 20th June, 1895
Complete Specification Left, 20th Mar., 1896-Accepted, 6th June, 1896
PROVISIONAL SPECIFICATION.
Improvements in Electric Safety Lamps for Use in Mines and other
Places.
1, HENRY WILLIAM HEADLAND, of The Electric Light Works, High Street,
Leyton, in the County of Essex, Electrical Engineer, do hereby declare the nature
of this invention to be as follows:-
My invention refers to electric lamps chiefly adapted for use by miners in mines
or in such other places where it is of importance that the lamp shall be safe, be as
compact as possible and have no parts projecting or so placed as to be liable to
catch ou other objects when being moved about or otherwise.
According to my invention I construct the lamp in such manner that the glass
tube is mounted in a metal or other base provided with guards or safety bars to
prevent breakage and inside of this glass is mounted in a suitable socket or holder
a lamp. The socket is screwed or otherwise fixed into a concave mirror either at
the top or the bottom and there is another mirror opposite either at the bottom or
the top as the case may be. If the lamp be mounted on the lower mirror the wires
are either taken through tubes inside the glass tube or two of the guard bars made
hollow may be utilized for the purpose. The upper parts of the guard bars are
fixed to a disc which forms a support for the base of the battery and to which the
latter is screwed or otherwise adjustably fixed. Outside the disc aud on another
disc above same of insulating material is so placed as not to be in the way a switch
by means of which the current from the battery above may be switched on or off
as desired. To the firstly described disc is screwed or otherwise adjustably
connected a tubular casing for containing the battery. The battery which I prefer
to use is of the kind described in the Specification appertaining to the Letters
Patent No. 15,120 dated 22nd August 1892.
The contacts between the battery and the lamp are so arranged that the mere
fact of putting the battery in place causes the connections to be made in the disc
of insulating material which also, as aforesaid, carries the switch.
The upper part of the casing is provided with a removable lid surmounted by a
hook, ring or other convenient means for attachment.
Dosed this 20th dow of June 1805
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.
Improvements in Electric Safety Lamps for Use in Mines and other
Places.
J, HENRY WILLIAM HEADLAND, of The Electric Light Works, High Street,
Leyton, in the County of Essex, Electrical Engineer, 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 :-
My invention refers to electric lamps chiefly adapted for use by miners in mines
or in such other places where it is of importance that the lamp shall be safe, be as
D

page_text: compact as possible, and have no parts projecting or so placed as to be liable to
catch on other objects, when being moved about or otherwise.
On the accompanying drawing Fig. 1 is a vertical section through a miner's lamp
constructed according to this invention and Fig. 2 is a plan of the lamp with the
battery removed.
The glass tube A is mounted in a metal or other base B made in one
piece or in several pieces as shewn provided with guards or safety bars C to
prevent breakage or injury to the tube. Inside of the latter is mounted a glow
lamp D in a suitable socket or holder E which with a concave mirror or reflector F
is secured to the brass or other base B. There is another concave mirror H at the
top, and the lamp D might if desired be secured thereto instead of in the manner
shown. If mounted as here shown the wires I and K are either taken through a
tube or tubes placed inside the glass tube A or as here shown one of the guard
bars C (or two of them) made hollow and utilized for this purpose. The guard
bars C are at their upper ends secured to the ring L provided with the wooden or
other insulating disc N and forming the support for the base of the battery M,
and the ring L serving to fix thereto the metal casing P for instance by means of
a couple of screws T, so that the battery can be easily detached for recharging
it. O is a switch working in under spring contacts V and V' on an insulating
disc O and placed so as not to be in the way; to this the wires are connected and
by it the current from the battery M may be switched on or off as desired. The
battery should be of the most approved construction and stitable for the purpose;
1 prefer to use one of the kind described in the Specification of my Patent
No. 15120 dated 22nd August 1892. The contacts between the battery and the
lamp are so arranged that the mere act of putting the battery in place causes the
connections to be made in the disc O' which carries the switch O, contacts U being
provided on the battery and corresponding spring contacts X and X' on the
dise 0. The upper part of the casing P is provided with a removable lid Q
surmounted by a hook-ring R or other convenient means for attachment. The
glass tube A has india rubber, asbestos cloth or other suitable rings S at top and
bottom to bear upon to prevent undue vibration and injury to the parts, and
I for the same purpose provide rubber rings S' or the like for the reflectors H
and F to bear upon.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
1. An electric lantern consisting of a glow lamp, a glass tube surrounding it
laterally, an upper and a lower concave mirror or reflector, one of which carries
the glow lamp, guard bars for securing the reflectors to the glass tube, an encased
battery on the top, wires therefrom to the lamp and a switch for making and:
breaking the circuit substantially as set forth.
2. An electric lantern consisting of a glow lamp, a glass tube A surrounding it
laterally, an upper concave mirror H, a lower concave mirror F which carries the
lamp, a base B, upper discs N. O¹ with ring L, guard bars C for holding the parts
together, one or two of them serving as casings for the conducting wires, a switch
on the disc 01, spring contacts X and X¹ thereon and an encased battery
mounted detachably thereon, and provided with contacts U substantially as
described with reference to the drawing.
Dated this 20th day of March 1896
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.