An Apparatus for Actuating the Hammer or Striker of an Alarm or Signal Bell.
Year: 1889

page_text: Date of Application, 4th June, 1889
Complete Specification Left, 1st Mar., 1890-Accepted, 5th Apr., 1890
.
PROVISIONAL SPECIFICATION.
An Apparatus for Actuating the Hammer or Striker of an Alarm
or Signal Bell.
I, JOHN HALL of Lansdowne House Swadlincote in the County of Derby, Colliery
Owner and Manufacturer, do hereby declare the nature of this invention to be as
follows:-
My invention consists of an apparatus for actuating the hammer or striker of an
alarm or signal bell such for example as is used in engine rooms, railway signal
boxes, at pit mouths or in hotels or other establishments.
My apparatus is constructed as follows:-At a position near the hammer or striker
I fit a bar or rod which is free to be moved endwise to a limited extent under the
action of a wire or connection from the place from which the signal or communication
is to be made. This bar, after the pull which has moved it endwise ceases, returns
to its normal position by its own weight assisted if necessary by a weight or spring.
On the bar is a stud or projection that takes into a slot in a pivoted arm which
carries a finger connected thereto by a knuckle joint or equivalent joint. This
finger is normally below the tail of a pivoted piece of bell crank or other suitable
form that carries the hammer. When the bar above described pulled by the wiro
or connection the stud raises the pivoted arın so that the knuckle jointed finger
comes in contact with and lifts the tail of the hammer piece, and thereby causes the
hammer at the other end of this piece to move from the bell, when the finger which,
during this movement is practically rigid has passed the hammer piece, this returns
quickly to its normal position under the action of a weight or spring and the hammer
strikes the bell. During the return or downward movement of the bar the finger,
when it comes in contact with the hammer piece, turns on its joint and is thereby
enabled to pass this piece and to reach its normal position below the same.
Detal thin 4th day of Jun 1900
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Patent Agent.
COMPLETE SPECIFICATION.
An Apparatus for Actuating the Hammer or Striker of an Alarm
or Signal Bell.
I, JOHN HALL of Lansdowne House, Swadlincote in the County of Derby, Colliery
Owner and Manufacturer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
My invention consists of an apparatus for actuating the hammer or striker of an
alarm or signal bell such for example as is used in engine rooms, railway signal
boxes, at pit mouths or in hotels or other establishments.
My apparatus is constructed as follows: At a position near the hammer or
striker I fit a bar or rod which is free to be moved endwise to a limited extent
under the action of a wire or connection from the place from which the signal or
communication is to be made. This bar after the pulls which has thus moved it
end wise ceases returns to its normal position by its own weight assisted if necessary
by a weight or spring. On the bar is a stud or projection that takes into a slot in a
pivoted arm which carries a finger connected thereto by a knuckle joint or
equivalent joint. This finger is normally below the tail of a pivoted piece of bell-
crank or other suitable form that carries the hammer. When the bar above
described is pulled by the wire or connection the stud raises the pivoted arm so that

page_text: the knuckle jointed finger comes in contact with and lifts the tail of the hammer
piece and thereby causes the hammer at the other end of this piece to move from the
bell; when the finger, which during this movement is practically rigid, has passed
the hammer piece this returns quickly to its normal position under the action of a
weight or spring and the hammer strikes the bell. During the return or downward
movement of the bar the finger when it comes in contact with the hammer piece
turns on its joint and is thereby enabled to pass this piece and to reach its normal
position below the same.
The accompanying drawings represent an apparatus constructed according to my
invention. Figure 1 is an elevation showing the parts in their normal position or
position of rest; Figure 2 an elevation showing the parts in the position they
occupy when the finger has lifted the tail of the hammer piece but has not quite passed
it; and Figure 3 an elevation showing the parts in the position they occupy after the
hammer has struck the bell and the finger is passing the hammer piece so as to
return to the normal position, Figure 1. a is a plate carrying the various parts and
fixed in a vertical position to any suitable support, b is the bell and c the hammer
which is normally very nearly in contact with the bell but is kept from actual
contact therewith by a stop d. The hammer is carried on the upper end of a
piece e,
el of bell-crank shape pivoted on the stud f, the part e¹ having a sufficient
amount of elasticity or flexibility to allow the hammer to reach and strike the bell
under the influence of the weight g when the tail of the piece e, e¹ after having
been lifted by the finger is again freed. h is a finger connected by a knuckle-joint i
to an arm k pivoted at 7 and formed with a slot m into which a stud n on a vertical
bar takes. This bar p is free to be moved endwise to an extent limited by the
pins 9,
and slots r, r. s is a wire or like connection attached to the top of the bar
and leading to the place from which the signal or communication is to be made.
weight may be attached to the lower end of the bar.
p
It will be readily understood that when the bar p is pulled up by the wires the
stud n raises the pivoted arm k so that the finger comes in contact with and lifts
the tail of the piece e e¹ and thereby causes the hammer to move from the bell (see
Figure 2) and that when the finger which during this movement is practically rigid
has passed the piece e, e¹ this piece returns quickly to its normal position under the
action of the weight 9 and the hammer strikes the bell. During the return or
downward movement of the bar p which takes place as soon as the pull wire s is
freed the finger h when it comes in contact with the tail of the piece e, e¹ turns on
its joint (see Figure 3) and is thereby enabled to pass this piece and to reach the
normal position Figure 1.
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 :-
The combination of parts substantially as hereinbefore described and represented
in the accompanying drawings forming an apparatus for actuating the hammer or
striker of an alarm or signal bell.
Dated this 25th day of February 1800
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Patent Agent.