An Apparatus for Giving Warning of the Over-heating of Bearings and other Working Parts of Machinery, and for other Purposes.
Year: 1889

page_text: Date of Application, 1st June, 1889
Complete Specification Left, 24th Feb., 1890-Accepted. 12th Apr. 1890
PROVISIONAL SPECIFICATION.
An Apparatus for Giving Warning of the Over-heating of Bearings
and other Working Parts of Machinery, and for other Purposes.
I, HENRY JAMES ELLIOTT of No. 5 Tenterden Road, Lower Tottenham, Middlesex,
Gas Engineer do hereby declare the nature of this invention to be as follows:-
This aperatus is preferably made in the form of a small cylindrical metal box the
bottom end being stopped and provided with an external screw for the purpose of
fixing it to the bearing or part to be protected.
In the upper end is screwed or otherwise fixed a non-conducting lining or collar
preferably of ivory or ebonite-through which is fixed a metal screw which on the
outer end is provided with a screw or nut for the purpose of connecting an insulated
electric wire in circuit with an electric bell and battery-the metal screw passing
through the insulating collar is drilled through or sufficiently through its centre to
form a guide for a pointed wire furnished with a spiral spring long enough to reach
and press on the bottom of the box-and thus close an electrical circuit through the
machinary back to the battery.
Normally this wire will be prevented from making metalic contact with the bottom
of the box by the interpossition of a piece of sealing or other wax rosin-gutia percha
or other non-conducting material-liquifying by heat, and a series of holes being
drilled through the box, so as to allow the molton wax to escape when the bearing or
other working part becomes heated. The molton wax escaping through the holes
provided for that purpose allows the pointed wire to touch the metal of the box, and
thus completing the circuit sounds the electric bell fixed in some convenient possition-
the rotary currant passing through the shafting and metal work of the machinary
itself, back to the battery. Should however any part of the machinary be found not to
be in metalic contact with the rest, it can be readily made so by connecting them with
an ordinary uncovered metal wire attached to any convenient screw or nut and in the
same way to the zinc element of the battery.
It may be nessessary by reason of the extent of the work, to include an indicator so
as to more readily shew the location of the heated part, of which electrical indicators
there are several suitable kinds in common use.
This aperatus may also be used for the purpose of giving an alarm, in case of a fire
occuring in any house or premises. To render them suitable for this purpose it will be
nessessary to mount them on metal plates, fixed and connected with bell as in the
usual way with ordinary electric bells.
TRO
1000
HENRY ELLIOTT.
COMPLETE SPECIFICATION.
An Apparatus for Giving Warning of the Over-heating of Bearings
and other Working Parts of Machinery, and for other Purposes.
HENRY JAMES ELLIOTT of No. 5 Tenterden Road Lower Tottenham in the county
of Middlesex, Gas 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 relates to an electrical apparatus whereby early warning can be given
of the beating of machinery bearings or of the outbreak of fire and the invention
consists in the means hereinafter described whereby the heat of the bearing or an
unusual high temporature of the surrounding air is made to close an electrical circuit

page_text: in connection with an electric battery and indicator to sound the bell and show on the
indicator the location of the heated part.
This apparatus is preferably made in the form of a small cylindrical brass box
having at one end a projecting screw to screw into the machinery bearing and at the
other end a brass screw passing an ebonitė or ivory collar to insulate it from
electrical contact with the box and furnished on the outside with a nut to connect
a properly insulated wire from the battery bell etc. the metal screw passing
vertically through the insulating collar, is drilled through or sufficiently through
its centre to form a guide for a pointed metal wire furnished with a spiral spring
long enough to reach and press on to the bottom of the interior of the box, this
spring taking its pressure from the face of the guide screw to a collar screwed or
soldered on to the pointed end of the wire and thus make metallic contact between
the insulated screw and the box itself when a piece of shellac wax, rosin, or
similar material becomes soft enough to allow the spring wire to penetrate it,
the return currant passing through the metal work of the machinary itself and
by wires back to the battery, sounding in its circuit an electric bell and operating
an indicator fixed for the purpose described.
To give warning of the outbreak of fire the same form of apparatus would be
screwed into a metal fixing plate by the screw projecting from the insulating
screw end, between which and the plate the conducting wire from the battery
bell etc. may be twisted, or the plate may have a contact screw provided for that
purpose the return wire to battery being connected under the nut at the other
end.
Instead of interposing a piece of shellac I may employ a small disc of fusible
alloy melting at a low temporature and insulated from the box by being mounted
in a seating or ledge turned inside a small ring of ebonite or other suitable
material.
DESCRIPTION OF DRAWINGS.
Fig. 1 is a half section showing the interior of the apparatus. Fig. 2 is a
similar section mounted on a fixing plate as for fire alarm. A is the metal box.
B the insulating collar. the connecting screw and guide for the sprung wire D.
E is the shellac or other insulating interruption. Fig. 3 shows a thread cut on
the outside of the box which is a more convenient method of fixing when the
cover of the bearing has to be drilled through in which case the box is made the
requisite length to screw hard down on the bearing brass beneath. Fig. 4 is a
section of an ebonite ring cut in on the inside with a seating or ledge to fit
a small thin disc of fusible alloy which it may be nessessary to use in place of
shellac rosin etc. for temporature of 160° and upwards.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. The combination of means substantially as herein shown and described in
Figures 1. 2 and 4 of the Drawings, whereby a piece of shellac, gutta percha, sealing
or paraffin wax or some similar material or combination of 2 or more of them
liquefying by heat or a disc of fusible alloy melting at a low temporature mounted in
an insulating ring so as not to touch the bottom or sides of box is interposed between
the point of a spring wire and the metal box and consequently with the battery the
softening or melting of which allows the completion of circuit with electric bell and
indicator as and for the purposes hereinbefore shown and described.
In witness I the said Henry James Elliott have hereunto set my hand and seal
this Twenty-fourth day of Fahrname AD 1000