An Improved Alarm Bell, which may also be used as a Door Handle.
Year: 1891

page_text: Date of Application, 26th Feb., 1891
Complete Specification Left, 6th May, 1891-Accepted, 4th July, 1891
PROVISIONAL SPECIFICATION.
An Improved Alarm Bell, which may also be used as a Door
Handle.
I, GEORGE CHISHOLM Junior of 72 Port Street in the Town and County of
Stirling, North Britain, Plumber, do hereby declare the nature of this invention
to be as follows:-
:-
My invention consists in forming of brass or other suitable material a cylindrical
metal piece having a disc at each end, the one for attachment to the door and the
other for fixing thereto the mechanical parts operating the bell.
The mechanical parts consist of a revolving disc which moves in a seat provided
for the purpose on the disc; across the revolving disc, a bridge or arch, composed
of a strip of metal, is formed which has at its top central part a stud into which a
screw pin or nail is placed to secure the bell when placed in position, covering the
mechanical parts; the bell being used as a handle to open or shut the door.
Near
the edge of the revolving disc is pivoted a small lever having at its other end a
button or stud also pivoted for striking the bell. The end of the lever pivoted at
the edge of the revolving disc, is of heavier metal than the remaining part and
which has one side thereof grooved in which a small wire or spring works, said wire
or spring being mounted upon or attached to a pin fastened to the bottom edge of
the revolving disc's seat, the disc itself being partly cut away at that point to admit
of free motion whilst the other side of the said heavier metal piece is plain, but
slightly curved, against which another lever or bar operates, this bar being pivoted
near the centre of the revolving disc, and extending to the edge of the disc attached
to the cylindrical metal piece where said bar also operates betwixt two small pins
or studs. Attached to the underside of the revolving disc is a rod or spindle having
a square hole cut lengthwise into which another rod or spindle attached to another
handle from the outside of the door enters for opening the door and working
the bell.
This bell above described is intended only for inside use as an alarm, and when
placed in position it also acts as a handle for opening and closing the door. When
placed in position inside the door the rod or spindle attached to the handle outside
is passed through and connected with the handle inside.
When a person turns the handle from the outside the revolving disc moves, and
the bar or lever which acts against the lever and spring, leaves its position, whilst
the spring presses and forces the lever and button against the bell causing the bell
to sound, indicating that the door is open.
Dated thin 95th das of Waluara 1001
JOHNSONS,
115, St. Vincent Street, Glasgow, Petitioner's Agents.
COMPLETE SPECIFICATION.
An Improved Alarm Bell, which may also be used as a Door
.
Handle.
1, GEORGE CHISHOLM Junior, of 72 Port Street, in the Town and County of
Stirling North Britain, Plumber, 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:-
This invention relates to an improved alarm bell which may also be used as a
door handle, and consists in forming of brass or other suitable material, a cylindrical
CD 077

page_text: metal piece having a disc at each end, the one for attachment to the door, and the
other for fixing thereto the mechanical parts for operating the bell, and which is
attached to a central revolving disc which is secured to the ordinary lock's square
spindle, the outer end of which is provided with an ordinary handle, which
on being turned not only operates or opens the door, but rings the inside handle
or bell."
But in order that the foregoing may be more readily understood, I will proceed
to describe the same with reference to the accompanying sheet of explanatory
drawings.
Figure 1, is a side elevation, Figure 2, an end elevation, Figure 3, a sectional
elevation, and Figure 4 a part end elevation showing the internal details of my
improved alarm bell. Figure 5 is a sectional elevation and Figure 6, a part end
elevation showing a modification of my said alarm bell.
Referring to the said drawings, Figures 1 to 4 inclusive, I construct or form a
cylindrical piece A, having a disc « either formed on or attached to its one end
for attaching the whole to the door, the said cylindrical piece A has also another
disc a', provided at its other end, to which the mechanical or operating parts are
attached.
The said mechanical or operating parts, consist of a revolving disc B, which
moves in a seat a², provided for it on the said disc a. Across the said revolving
disc B, is a bridge or arch b, which is provided with a square part or stud 6, at its
top into which a screw pin or nail 2, is placed after the bell C has been fitted on
the part b, there being a corresponding square hole formed in the said bell C, for
this purpose, and which when placed in position covers the said mechanical or
operating parts, as well as being used as a handle. The said revolving disc B is
provided with a rod or spindle B', which passes through the said cylindrical piece A,
in which it is free to be partially revolved by means of the outer handle and lock's
spindle D, which enters into the said rod or spindle B', there being a square hole b³,
cut lengthwise for this purpose; the revolving disc B and its connections are kept
in the proper positions by means of a nut, or nuts, D', screwed on the end of the
revolving disc's rod or spindle B', as shown more particularly in Figure 3. On the
front side of the said revolving disc B, and near the edge thereof, I pivot a small
"lever E, having at its outer end a pivotted button or stud e, which acts as a hammer
for striking the bell C, the pivotted end e², of said lever E, is made of heavier
metal than the rest and formed with a groove e, in which the one end of a spring
or wire F, works, the said spring or wire being secured to a pin or stud f screwed
or otherwise secured to the seat a² of the metal disc a', the said revolving disc B,
being partly cut away at that point, (as shown at Figure 4) so as to permit of
free motion, the said pivotted end e, of the lever E, is also formed with a curved
track e, against which the curved end g, of another pivotted lever G works, the
said lever G, being pivotted near the centre of, and to, the revolving disc B, while
its outer end extends to the outside of the disc a', and works between two pins, or
studs y, both of which are screwed or otherwise attached to the said disc a'.
⋅
The whole arrangement being such that on the outside handle and spindle D
being turned, it causes the revolving disc B to turn and so moves the lever G, especially
its curved end g, out of the track e, of the lever E, and so allows the said lever
being forced, and with it the hammer e, against the bell C, by means of the spring F,
thus ringing the said bell C. But owing to the construction of said alarm bell,
which is intended for inside use, it, (the alarm bell) may also be used as a handle
for opening or closing the door from the inside by the hand which tends to muffle
the alarm, thereby deadening and so preventing it from sounding.
Or in lieu of the foregoing I may construct my said alarm bell as shown in the
modification of same in Figures 5 and 6, of the accompanying drawings, in which
case I form the levers E and Gas one double lever H, having a hammer arm h,
and spring arm, the said hammer arm h, being provided at its outer end with a
fixed hammer ; and the spring arm ', with a groove, against which the said
spring works, which in this case is made longer and its end f¹ is caused to bear

page_text: against a projection of the bridge; the action being such that on the revolving
disc B, being turned through the medium of the outer handle and spindle D, the
arm ', is forced up and with it the arm h, and hammer h², by means of the spring F,
thus ringing the bell C, while on the outer handle being released the parts, owing
to the weight of the hammer, assisted by the action of the lock, resume their normal
position, as shown in dotted lines, Figure 6.
Having pow 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
1st. The general arrangement, construction and combination, of the various
parts, constituting my improved alarm bell and door handle, all substantially as
and for the purposes hereinbefore described and shown in the accompanying
drawings.
2nd. In door handle alarm bells the arrangement and combination of a revolving
disc B, pivotted levers E, and G, and spring F, with a cylindrical piece A and
pins ', or any mere modification of said parts, substantially in the manner as, and
for the purposes, hereinbefore described and shown in the accompanying drawings.
Dated this 5th day of May 1891.
JOHNSONS,
115, St. Vincent Street, Glasgow, Petitioner's Agents.