Year: 1886

page_text: Date of Application, 6th Dec., 1886.
Specification Accepted, 7th Jan., 1887.
I, HERBERT JOHN HADDAN of 67, Strand, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by Nahum Judson Busby, of 76, State Street, Boston, State of
Massachusetts, United States of America, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
In the accompanying drawings, Fig. 1 is a transverse and vertical section of part
of a door frame and my improved bell or alarm applied thereto.
Fig. 2 is a front view of the bell striking mechanism as it appears when the bell
and the front disc of the wheelwork frame are removed.
Fig. 3 is a rear view of such bell striking mechanism.
Fig. is a transverse and vertical section of part of a door frame and my improved
bell or aların applied thereto.
Fig. 5 is a rear view of the bell striking mechanism, as it appears when the bell
and the front disc of the wheel work sustaining frame are removed.
Fig. 6 is a vertical section taken through the winding arbor spring in a plane at
right angles to such arbor.
In the alarm shewn in the Figures 1, 2 and 3, the main spring for actuating the
train for working the hell hammer, is wound sufficiently during each pull of the
operative knob, whereas in the alarm represented by Figs. 4 to 6 the main spring has
to be wound up by a key, as hereinafter explained.
The nature of my inventon is defined in the claim or claims hereinafter presented.
In the drawings, A denotes part of a door frame, to which the bell pulling knob of
the entrance door of a house is usually applied the said knob being represented at B,
as jointed to a bell crank lever C, pivoted as usual within a stationary socketed
carrier D.
.
From the lever C, a wire E leads upward to and through a hole a in an ear b
extending from a bracket F, to which is affixed the frame G for supporting the
bell H, the hammer 1 thereof and the striking or operative mechanism of the latter.
T
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page_text: The wire E at its upper end is fastened to a take up spring K which consists of a
piece of wire, spirally coiled to form an eye e near its middle or thereabouts-the
parts d and e of such wire extending from the eye being arranged at or about a right
angle to each other.
In Figs. 1, 2 and 3, the part d at its upper portion, extends alongside of a scape
wheel that is fixed on an arbor h journalled in the said two discs i and k of the said
frame G. The bell hammer shown at I projects from another arbor provided with
pallets m m to engage with the scape wheel.
A lantern pinion » fixed on the hub of the scape wheel, engages with a gear o that
revolves freely on the arbor and is provided with a pawl q to engage with a ratchet
wheel fixed on said arbor, a curved springs serving to press the pawl against the
teeth of the ratchet wheel. Extending around the arbor and fixed at one end thereto,
is a helical or main spring t which at its outer end is fastened to one of the
posts. There is fixed upon and projects from the arbor pan arm w, to which and
the eye c of the take up spring K a connecting rod is pivoted.
む
On the knob B being pulled, the take up spring will be drawn downward, in
consequence of which the arbor and the ratchet wheel will be partially revolved, and
the main spring & will be sufficiently wound up-the ratchet wheel slipping at the
time under the pawl. On the knob B being let go off, the take up spring will retreat
and will revolve the arbor p, so as to cause the ratchet-wheel, by its-action-against-the
pawl, to revolve the gear o and thereby cause such gear to put in operation the rest of
the train, by which the bell hammer is reciprocated and caused to rapidly strike the
bell several times in succession.
In the alarm shown in Figs. 4 to 6, the part d rests upon one of the series of posts
that form with two metallic dises and a frame for supporting the wheelwork
and parts adjacent thereto to be described. The other portion of the spring K is
coiled around and fixed in a shaft. extending between and journålled in the two
dises hand i
From the said shaft & a hooked wire or arm projects upward against one side of a
scape wheel m, such wheel having a stud n extending from the said side of it with
respect to the arm in manner as represented. Pallets o o carried by another shaft p,
from which the shank of the bell hammer I projects-operate successively with and by
the scape wheel, in order-while such wheel may be in revolution-to cause, tho.
hammer to repeatedly strike and sound a bell H, which is supported on a tubular
projections extending from the disc i, and concentrically therewith.
The arbor t, that sustains the scape wheel, has fixed upon it a lantern pinion u
which engages with a gear of a train of gears we the gear e revolving loosely on
the winding arbor y. To the winding arbor of the gear the inner end of a helical
spring is fixed-the said spring at its outer end being fastened to one of the posts g of
the wheel work frame. There is fixed on the winding arbor and aside of the gear & a
ratchet wheel a', with which a pawl pixoted to the said gear e engages, and to
which it is forced by a spring el.
A knob d pivoted or properly applied to the winding arbor, on being revolved, will
revolve such arbor to enable the helical spring to be contracted, the pawl and the
ratchet wheel serving to hold the spring from extending, so long as the arm / may be
hooked upon the stud n. Upon such arm being drawn away from the stud, as it will
be when the knob B is pulled, and causes the wire E to draw downward the take
up
spring or wire K; the train will be set free, and the bell will be repeatedly sounded,
until the stud n may bring up against the hook of the arm 7, the said arm having been
moved upward by the spring K on the knob being released from the hand that pulled
it. To ensure the upward movement of the arm 7, there is applied to it an auxiliary
spring e which at its upper end is secured in the disc i. In the place of a knob to be
pulled and the bell crank connected to it, other proper means for actuating the wire
may be substituted.
From the above it will be. seen that I have described substantially a common and
well known mechanism for repeatedly sounding a bell, and have combined with it and
the knob and wire leading therefrom, the angular spring K which serves not only to

page_text: take up any slack or stretching of the wire, but when pulled down by the wire, to
turn the shaft k sufficiently to cause the hooked arm to be moved downward out of
engagement with the stud n.
The wire E after being passed through the eye e is coiled about itself, the upper end
of it serving with the ear as means of arresting the knob in its backward pull.
Having now particularly described and ascertained the nature of this invention and
in what manner the same is to be performed, I declare that what I claim is
1) In the alarm represented by Figs 1 to 3 and hereinbefore described:
a) The combination with the main spring winding arbor, of the bell striking
mechanism, and with the take up spring or springs of mechanism, which on a pull
of the bell actuating wire attached to the take up spring, shall so turn said winding
arbor, as to cause it to wind up or contract the main spring, in order for it-
during a return movement of the take up spring-to set in motion the train or
mechanism for reciprocating the bell hammer.
6) The combination with the frame G and the main take up spring and its
shaft, arranged in such frame as described and with the bell hammer operative main
spring and train-and the mechanism connecting the main spring arbor and the
main take up spring of the auxiliary take up spring applied to the main take up
shaft and to the said frame, substantially as set forth.
c) The combination constituting the bell hammer operating train, such combi-
nation consisting of the main spring, its arbor, the ratchet wheel fixed on such arbor,
the gear revoluble on such arbor, the pawl and its spring applied to such gear-
the lantern pinion and its shaft, the scape wheel fixed on such shaft, and the
pallets and theirshaft, all being arranged, and the hammer being fixed to such pallet
Shaft, substantially as represented.
d) The bell wire combined with the winding arbor of the main spring, for
actuating the bell hammer by means which, during a pull of such bell wire-will
cause the said main spring to be wound up or contracted, in order for it, on the wire
being free to fall back-to set in operation the train for actuating the hammer.
e) The combination with the frame G and the hammer operative mechanism
therein, of the main take up spring provided with the hook or stop as described, and
applied to or connected with, as specified, such mechanism and frame, and serving with
one of the posts of the said frame, as a means of arresting the take up spring, to
limit a pull of the bell wire and prevent overstraining of the spring, as set forth.
2) In the alarm represented by Figs. 4-6 and hereinbefore described:
a) The combination with a bell and mechanism substantially as described, for
repeatedly sounding it, and with the operative wire provided with means of pulling
it as described, of the bent wire or take up K applied to the frame G and the shaft
of the hooked armor catch of the scape wheel of the said bell sounding mechanism,
all being essentially as set forth.
The combination with the bell and its sounding mechanism and the
supporting frame thereof, of the bracket arranged with such frame as represented,
and provided with the ear, as described, for reception of the actuating wire, and to
serve therewith as a means of arresting the knob in its backward pull as explained.
c) The combination with the bell and its sounding mechanism and the
supporting frame thereof, and with the actuating wire and the take up K thereof, as
described, of the stationary ear for reception of the said wire, and to serve with it
as means of arresting the downward movement of the said take up, all being
substantially as set forth.