Year: 1888

page_text: Date of Application, 21st June, 1888
Complete Specification Left, 21st Mar., 1889
Complete Specification Accepted, 11th May, 1889
Edward Cox WALKER of Feethams Darlington, Electrical Engineer and ALAN
ARCHIBALD CAMPBELL SWINTON of 75 Queen Victoria Street London E.C. Engineer,
do hereby declare the nature of this invention to be as follows :-
This invention relates to improvements in Electric Bells designed to be operated
by Magneto Electric Machines or Generators and has for its object, increased
efficiency in working and greater simplicity in construction.
According to our invention we employ a suitable horse shoe electro magnet with
an armature pivoted in front of its poles in such a manner that the said armature
can vibrate in front of the said poles under the influence of the attraction of the same
with facility, the said armature having attached to it a striker or hammer to strike
the gong or gongs employed.
The electro magnet and armature may with advantage be polarised by means of a
permanent magnet fastened at one end to the yoke of electro magnet and with the
other end in proximity to the pivoted armature.
We find it convenient to make the distance between the armature and the poles
of the electro magnet adjustable and also to mount the gong or gongs employed
so that its or their distance from the hammer can be adjusted, and we also find it
advisable to mount the whole mechanism, including, the gong or gongs on a metal
frame work which if required can be attached to a wooden or other base, the object of
the metal framework being to obviate the difficulties which without the same are
consequent on expansion or contraction of the wood.
In electric bells hitherto constructed, when it has been required that a ring should
be given at both ends of the stroke of the armature or hammer it has been usual to
employ two separate gongs with the hammer-head placed between them so as to strike
one and the other alternately.
According to our invention we obtain similar results with a single gong.
In some cases we effect this by employing a double or bi-furcated hammer, so
arranged on either side of the gong or on either side of a tongue or projection on
the gong that one head of the said hammer strikes the gong or tongue or projection

page_text: when the armature is moved in one direction and the other hammer head strikes in a
similar manner when the other armature is moved in the other direction and we find
it convenient to make the said hammer heads adjustable so that the distances between
them and the gong tongue or projection can be readily regulated, this being performed
by means of a set screw or screws regulating the distance between the two hammer-
heads or by making the said hammer-heads themselves of set screws passing through
the double or bifurcated arms of the hammer shank or we sometimes make the hammer-
heads non adjustable and make the position of the gong or of the tongue or projection
on the same adjustable, in a manner similar to the above.
Or according to our invention we sometimes employ a single hammer head placed
between two tongues or projections on the same gong, or in a slot or aperture cut
in the gong itself so that the said hammer head strikes one tongue or projection or the
other or one or other side of the aperture or slot according to the movement of the
armature and we find it convenient to make the positions of the tongues or
projections of the aperture or slot adjustable or make the hammer head adjustable by
means of set screws or otherwise in a manner similar to what has been hereinbefore
described so that the relative positions of the striking and struck portions of the
mechanism can readily he regulated to give the maximum efficiency.
We also sometimes arrange the mechanism as described above, so as to be all
contained under the gong the mechanism and gong being mounted on a circular or
other metal frame attached preferable to a suitable wood or other base, or we may
arrange the mechanism outside the gong either above or below the same, the
mechanisin being preferably protected-by a suitable cover and the gong being fixed
to an arm of metal projecting from the metal framework of the mechanism and the
whole being conveniently mounted on a suitable wood or other base.
Dated this Nineteenth day of June 1888

page_text: EDWARD COX-WALKER of Feethams Darlington Engineer and ALAN ARCHIBALD
CAMPBELL SWINTON of 66 Victoria Street London S.W. 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:-
Our invention relates to an improved construction of Electric Bells to be worked by
electrical current from magneto electric generators, or other suitable generators of
electrical currents.
Our invention has for its object to obtain greater compactness and simplicity in
construction and increased efficiency in such apparatus, and it consists mainly in
combining on one and the same metal frame the following parts: two bobbins
with iron cores which are secured at one end to an iron plate or bracket on the frame,
thus forming with the plate or bracket a Horse-shoe electro magnet: a bar shaped
armature held on pivots in front of the poles of the Electro magnet by an arm secured
in an adjustable manner to the bracket of the frame: a striker arm fixed to the
middle of the armature and projecting forward between the two limbs of the electro
magnet, a bell fixed to a bracket or standard on the frame, and a permanent magnet,
fixed at one end to the plate connecting the cores of the electro magnet and after
passing along over or under the latter, having its other end bent down behind the
armature, so as to polarize this and the electro magnet.
This construction of magneto electric Bells is shown in two modifications on the
accompanying drawings.
In the arrangement shewn in plan and sectional elevation at Figs. 1 and 2, A is
the metal frame of circular form having a bracket A¹ projecting up from it which
serves firstly as support for the Bell B which covers the entire mechanism as shewn,
and secondly as attachment for the iron plate C which forms the yoke of the electro
magnet. To this plate are fixed the cores D¹ of the electro magnet bobbins D which
consequently stand out from the Bracket A¹, and have in front of their free ends the
armature E supported on pivots F screwed through the fork of an arm G carried by
the bracket A¹.
This arm has a screwed stem G¹ passing through a hole in the bracket A¹ and
having on each side thereof a nut G2, so that by means of these the position of the
arm G and consequently the distance of the armature from the electro magnet can
be adjusted.
The armature has fixed to its middle a striker stem H which passes a cranked
portion of or through a slotted hole in the arm G and between the two bobbins D D,
and has a head carrying two adjustable screw studs H¹. This head is situated
between two lugs B₁ B projecting from the inner surface of the bell, so that on a
vibrating motion being imparted to the striker by the armature, the studs H¹ in
beating alternately against the lugs B¹ effect the ringing of the bell; the beat of the
striker is regulated by adjusting the screw studs H', which might for this purpose be
arranged on the lugs B' instead of on the striker head.

page_text: By this arrangement we obtain the same result that has hitherto only been
obtained with two bells namely the emission of a sound at each single beat of the
hammer.
Instead of forming two lugs on the bell as described the striker may be formed with
a forked head embracing a single lug on the bell each limb of the fork being provided
with an adjustable stud for regulating the stroke.
To the plate C is fixed one end of a permanent magnet I which extends beneath
the electro magnet of the other end thereof, where it is bent up behind the armature E,
and is thus made to polarize the electromagnet and armature so that when the bell is
not in action the arinature remains in contact with the limb by which it was last
attracted.
The coils of the electromagnet are connected in any suitable manner with the
terminals K K on the base L of wood or other suitable material.
By mounting the whole of the mechanism on one and the same metal frame, the
advantage is gained that there can occur no irregularities of action, such as sometimes
take place the several parts are all substantially the same as described with reference
to Figs. 1 and 2, with the exception that the frame A is of a different form, and
carries the bell B on a pillar A¹ away from the other mechanism.
C is the iron plate forming the yoke of the electro magnet D D, and carring the
adjustable forked arm G that carries the armature E.
The permanent magnet I attached at one end to the place C is in this case carried
over the top of the electro magnet.
The other parts are all designated by the same letters of reference as the cor-
responding parts of the first arrangements and need not be further described.
Having now particularly described and ascertained the nature of
my said
invention, and in what manner the same is to be performed 1 declare that what 1
claim is
(1) A polarized magneto Electric Bell with its parts arranged substantially as
described in relation to fig. 1 of the accompanying drawings.
(2) A polarised magneto Electric Bell with its parts arranged substantially as
described in relation to Fig. 2 of the accompanying drawings.
(3) In a magneto electric bell, a bell with two projecting lugs between which
the striker vibrates so as to give a sound at each beat, substantially as herein
described.
(4) In a magneto Electric Bell a striker head situated between two lugs on the bell
and having two adjustable studs for regulating the beat of the striker substantially as
herein described.