A NEW OR IMPROVED COMBINATION OF BELL, AND DOOR (OR OTHER) KNOB OR HANDLE
Year: 1884

page_text: I, WILLIAM HENRY PIKE at the Office for Patents 6, Lord Street, Liverpool, in
the County of Lancaster, Bell Maker, do hereby declare the nature of the said
Invention for "A NEW OR IMPROVED COMBINATION OF BELL, AND DOOR (OR
OTHER) KNOB OR HANDLE" and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:—
This Invention has for its object a door knob that shall give an alarm when
turned from one side, yet not when turned from the other, and that can be set to
give an alarm or not as required. It consists in constructing the knob with a bell,
so that when the other knob is turned it will cause the bell to ring, but so arranged
that the bell can be thrown out of gear when required. I have designed about
seven different methods of carrying the Invention into practice, but the one that I
think the best is set forth in the accompanying Drawings in which,
Fig. 1 shows a longitudinal section of knob and bell.
Fig. 2 end view of knob with bell removed.
In these A is the ordinary knob spindle, B a bell forming the end of the knob.
It can if desired be made larger so as to project over the neck of the knob, but for
most purposes it will be quite sufficient made as shewn. It is fixed on a spindle C,
cast with it, fitting into the shank of the knob and held by screw D. E is the boss
fixed on the spindle A by set screw or rivet pin or brazing, and having a part cut
out at F onto which the washer or fan plate G fits. G is the washer screwed to
the door and having a projecting cylindrical flange fitting over part F of the boss E.
H is a slot in said flange, and H₁ groove in boss E in which slides the cranked head
of pin I. I pin sliding through hole in boss E parallel with the spindle A, and
with crank head, so proportioned that it can be placed entirely in slot Hor
groove Has required; if in slot H, the bell is in gear, if in groove H' the bell will
remain silent when the knob is turned-if partly in one, and partly in the other
the latch is locked. This pin if desired can be arranged with a cam and a spring
fitting in slot J¹ (as with a lock tumbler) so as to be capable only of stopping in
two positions, entirely in H¹, or entirely in H, and of being held in either of those
positions by the spring when once in it. J is a tumbler sliding on pins K. K' and
having a cam slot L in which the upper crank of pin I works, it has a ward M
pressing against bell crank O so that whenever the pin I traverses its slot it moves
the bell crank O against the pressure of spring P, and thereby gives a stroke to the
clapper R which rings the bell. S is a spring to keep the tumbler up to pin K. 80

page_text: as to force pin I to stand in the centre of its stroke when not forcibly deflected.
The mode of action is as follows: the head of pin I being in slot H and the outside
knob being turned, the spindle and inside knob is turned too, and the slot H being
stationary, the head of I is forced to one side, the other crank of I draws back the
tumbler, and the latter pressing on the bell crank actuates the clapper and rings
the bell. When the latch is relieved, the handle as is customary is brought back
by the latch spring to normal position, and the tumbler J by spring S when the
head of I is in slot H ready for a fresh action. If it be wanted that the bell shall
not sound, the head of pin I is pushed up into groove H¹, it then revolves with the
boss. I have herein given one way and the best I have yet devised for actuating
the bell, but it is obvious that a tumbler is not absolutely necessary, as the pin I
could itself be arranged to actuate the bell crank of a clapper, or a stationary bell
could be fixed to the stationary washer, and struck by a clapper actuated by a cam
on the spindle or handle, and many other modifications could be made in the
carrying out of my Invention. In conclusion I am well aware that bell alarms
have been used that are actuated by the opening of doors, windows, and the like,
and I make no claim broadly for a bell alarm, wheu not connected with the latch
handle.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
1 The manufacture of knobs for use with latches of doors, safes, tills, and other
articles that open with latches, in which a bell forms a part of the knob, and is
rung by the turning of the handle, substantially as specified.
2nd In combination with an ordinary latch knob, a bell forming part of the
knob, and a clapper worked by the spindle in turning directly or through other
mechanism.
3rd In combination with a bell knob substantially as described, an apparatus for
throwing the bell clapper into and out of action, consisting of a movable catch on
the stationary part or moving part respectively, capable of being thrown into or
out of connection with the other of them (the moving part or stationary part
respectively.