Year: 1888

page_text: Date of Application 4th July, 1888
Complete Specification Left, 6th May, 1889
Complete Specification Accepted, 8th June, 1889
I, LESLIE WATT WINNALL, of Atlas Works, Bromley Street, Commercial Road, in
the county of Middlesex, Engineer, do hereby declare the nature of this invention to
be as follows:-
This invention relates to the construction of a new kind of electric bell, that is to
say, an electric bell which gives a double stroke or blow.
In constructing an electric bell according to my invention, I arrange the hammer
on pivots so that it can swing from side to side of the bell. The make and break
contact is provided with a spring insulated from the frame and an insulated pullet so
arranged that when the armature is brought up and the hammer strikes one side of
the bell, the pallet is forced in between the spring and the frame and theroby breaks
contact, allowing the hammer to fall by its own weight and make a second stroke,
whereupon the armature withdraws the pallet and contact being again made, the
opposite stroke is effected and so on.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.

page_text: I, LESLIE WATT WINNALL. of Atlas Works, Bromley Street, Commercial Road,
in the comnty of Middlesex, 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 a new kind of electric bell, that is to say, a bell adapted to
give a double stroke or blow.
In the accompanying drawing
Figure 1 is a sectional side elevation of an electric bell constructed according to
my invention, and
Figure 2 is a sectional front elevation of the same.
a is the bell proper, and is the electro magnet which is carried in the frame e
secured to the top of the bull by the shank d (attached to or forming part of the frame)
and the nut e serving as a neck for the bell.
fis the armature which is carried at the ends upon the two screws 7, g¹ so that it
can oscillate thereon.
his the hammer which is pivotted to the underside of the armature at hand i is a
stirrup secured to the armature in such a manner that when the latter is attracted by
the magnet the hammer will be moved in the direction indicated by the arrow to striko
the hell. The stirrup does not move the hammer into actual contact with the ball,
the stroke being completed owing to the momentum imparted to the hammer during
the first part of its stroke.
The stroke in the opposite direction is effected by the momentum which the hammer
acquires in falling away from the side positively struck.
The contact maker and breaker for causing the alternato magnetization and
domagnetization of the magnet to cause the above describel movements comprises a
pallet k carried on the serowy so that it can oscillate thereon and two spring arms 1,
insulated from the frame e by the block m and bearing against the pallet. The said
pallet is formed with two arms n, n' (between which works an arm o secured to the
armature) and is provided with an insulating piece p. 9 is an arm secured to the
armature for counterbalancing the arm o.
r, are binding screws for connecting the bell in an electric circuit the screw r
being connected by the wires with the electro magnet which latter is connected with
the arm by a wire t and the screw with the arm by the wire t¹.
The operation of the apparatus hereinbefore described is as follows:-Assume the
parts to be in the position shown in Figure 1 the current can then pass through the
screw r, the wire s, the electro magnet the wire t, the arm /, the pallet k, the arm
and the wire to the binding screw whereby the magnet is energized and the
armaturo attracted so as to cause the hammer to strike one side of the bell as herein-
before described. As the armature is moving towards the magnet the arm o impinges
against the arm n of the pallet moving the latter to place the insulating piece p against

page_text: the arm whereby the electric circuit is broken. The armature then drops so that
the hammer strikes the bell on the opposite side as hereinhefore described. As the
hammer drops the arni o strikes the arm n¹ of the pallet whereby the latter is again
moved to complete the circuit, and so on as previously described.
I sometimes arrange my bell to give positive strokes in both directions. In such
cases 1 employ two sets of electro-magnets which act alternately upon the two sides
of a V-shaped armature.
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. A new kind of electric bell such as that herein described wherein the hammer is
adapted to give a double stroke on opposite sides of the bell, as set forth.
2. In a double stroke electric bell the employment of an oscillating pallet operated
by the armature, for making and breaking the contacts, substantially as described.
3. In a double stroke electric bell, pivotting the hammer to the armature, substan-
tially as described.
4. The manufacture and use of the improved double stroke electric bell herein before
described and illustrated in the accompanying drawing.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.