An Improved Method of Suspending and Protecting from Injury or Breakage Incandescent Electric Lamps when Used for Mining or other Purposes.
Year: 1887

page_text: Date of Application, 27th Aug., 1887
Specification Accepted, 18th Oct., 1887
An Improved Method of Suspending and Protecting from Injury or
Breakage Incandescent Electric Lamps when Used for Mining
or other Purposes.
MARK BAILEY Nollies Lodge Clarence Road Wood Green London N. Electrician
and JOHN WARNER 21 Osborn Street Whitechapel E. London, Ironfounder 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 :-
Our Invention relates to an improved method of suspending and protecting from
injury or breakage, Incandescent Electric lamps, when used for mining or other
purposes. The way and manner in which we carry our improvements into effect will
be readily understood by reference to the annexed drawing in which :—
Fig. 1. is an elevation, partly in section shewing one form of our improved method
of suspending the globe and lamp.
Fig. 2. is an elevation partly in section shewing automatic contact breaker, in case
of rupture of outer globe.
Fig. 3. section shewing position of suspending diaphragm or elastic seating when
contact is broken.
Fig. 4. alternative method of packing outer globe and mounting lamp.
Fig. 5. method of mounting small lamps having no holders.
Fig. 6. socket and holder for loose diaphragm.
Fig. 7. plan of same.
Similar letters of reference refer to similar parts in all the drawings.
Various methods have been devised for protecting incandescent electric lamps from
injury or breakage when used in mines or under other circumstances wherein their
rupture might lead to explosions, or fire. The object of our invention is to avoid such
injury or breakage; and to that end we mount the lamp in an elastic seating, within
an outer globe; said seating sufficing to maintain good electrical contact between the
leading in wires of the lamp, or holder, and the terminals mounted upon the cover or
support for the same. At the same time the said seating provides a perfectly elastic
method of suspension protecting the filament of the lamp from shock, or vibration,
and thereby preventing its rupture and prolonging its life. Another part of our
invention consists in enclosing the lamp, mounted up as described in an outer globe
[ Prins 81

page_text: ramp for the conqueing to Liis end. Should
however rupture of the outer globe take place (the pressure upon the lamp and seating
being destroyed thereby) the lamp is forced by the elastic mount away from the
contacts and automatically extinguished.
DESCRIPTION OF THE DRAWINGS.
Fig. 1. A, is an incandescent lamp of ordinary pattern; fitted with a vitrite or other
suitable holder a, B, is an elastic diaphragm, or seating consisting of vulcanized
rubber, bladder, skin, or other suitable substance; a hole is punched in said seating
which is fastened by binding as at (, or in any similar manner to the holder a. The
elastic medium is now fastened by binding or by other suitable means to the rim of
outer globe D, and the outer globe and contained lamp screwed up or mounted in an
equivalent manner in the wood, metal, or other support E, care being taken to cause a
little stress or downward pressure upon the elastic seating so as to ensure good electrical
contact between the wires in the lamp holder c c, and the external terminals d d in the
support E.
Fig. 2. shews an Incandescent lamp so mounted as to automatically break the
circuit should the outer globe be ruptured A, is the lamp, B, the elastic mount consisting
of vulcanized rubber, bladder, skin, or other similar material suited to our purpose
which is fastened by binding or equivalent means to the globe D, and the lamp A, in
the manner already described. The outer globe D, is now charged with air, carbonic
acid nitrogen gas, aerated water, or any other fluid or liquid capable of exerting
pressure upon the enclosed lamp A, and the elastic seating B. When fully charged the
tube is sealed off. The outer globe D, is now mounted up in the support E, in the
way already described, good contact being ensured between the interior terminals c c.
and the outer terminals d d, by the internal pressure exerted by the gas, fluid, or
liquid upon lamp A, and elastic seating B. It will be observed that the seating is
slightly bent upward by the pressure refered to. Should however the outer globe D,
be ruptured or broken; the pressure being released, the lamp A, will be forced by the
elastic seating and its weight away from the contacts d d, see Fig. 3, the electrical
circuit broken, and the lamp extinguished.
Fig. 4, shews an alternative method of mounting up the outer globe and lamp.
The wood, metal, or other support E, is recessed as shewn, a screw being cut therein
and also upon the lid or cover.
Under the glass flange of globe D, is placed a stout ring or washer g, formed of
rubber leather or other suitable material. Upon the upper side of flange and within
the recess is fitted an elastic seating to which is fitted the lamp preferably in the
manner already described. Within the recess is screwed or otherwise fastened the
cap containing the outer terminals d d, the cap being screwed down so as to make a
perfectly tight joint. By this arrangement a broken lamp or outer globe can be
removed in a few moments.
Figs. 6 and 7, shew an improved method of securing the lamp or holder to the
elastic seating last described. A bush or collar a, is fastened in the centre of the seat,
and is screwed or formed with a bayonet joint. The lamp holder a, is similarly screwed,
or caused to fit the bayonet joint in the manner well understood, by this means a
broken lamp can be replaced without removing the elastic seating B.
Fig. 5, shews a method we prefer to employ in the case of small lamps having no
holders or equivalent fastening. In such case we prefer to lengthen the neck of the
lamp A, flattening out the platinum terminal wires cc, the lamp is then fastened to
the elastic seating as shewn and previously described the flattened wires c c, being
pressed by the seating B, against the outer terminals d d.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we would wish it understood
that we do not bind ourselves to the exact detail shewn in carrying the same into effect,
as several modifications could be made without departing from its nature, as for
instance the screwed socket in Figs. 6 and 7, might be replaced by a solid insulated
socket furnished with leading in wires having hooks, the lamp being attached thereto
in the well known manner-What we believe to be novel and desire to claim is―
1st. The Improved method of suspending and protecting from injury or breakage,
Incandescent Electric lamps, by the means, herein set forth and described.
2nd. The combination of an outer globe having a flange, an incandescent electric
lamp, with or without a holder being mounted within said globe in an elastic seating
fastened to said globe. The globe seating and lamp fastened thereto being supported
by a mount furnished with terminals or binding screws. Contact with said terminals,
and the lamp, or holder contacts being made by pressure exerted upon the elastic
seating substantially as set forth.
3rd. The particular combination described and shewn in Fig. 2. The globe fitted
with elasting seating containing lamp. Said globe being charged in the manner
described with air, gas, fluid, or liquid, to such density as to force upward the lamp,
holder & its terminals against the outer terminals contained in and passing through
cover the whole being so arranged as that rupture of the outer globe shall by means of
the elastic seating break the connection between the terminals in lamp, or holder,
and support and extinguish automatically said lamp-substantially as set forth and
described.
4th. The particular arrangement, combination, and construction described under
Figs. 4. 6. 7. The loose ring or washer, the elastic seating supporting the lamp and
independent of globe D, the method of fastening the lamp by binding the elastic seat
to the holder, or the lamp, or by the collar and screw device described and shewn in
Figs. 6 and 7, or by an equivalent bayonet joint. The recessed support containing
outer globe, elastic seat, lamp holder and packing washer. All combined and operating
together for the purpose set forth herein.
5th. The particular combination suited for mounting small lamps having no holders
described under Fig. 5 for the purposes set forth.