An Improved Door Knocker with Bell Attachment.
Year: 1889

page_text: Date of Application, 18th June, 1889-Accepted, 21st Sept., 1889
COMPLETE SPECIFICATION.
An Improved Door Knocker with Bell Attachment.
We WILLIAM NOTTING of the Enterprise Works, Bowling Green Lane, Farringdon
Road, in the County of Middlesex, Engineer, and CHARLES JAMES REEVE, of 40
Crofton Road, Camberwell, in the County of Surrey, 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 :-
The object of our invention is to procure what is generally known as a "knock and
ring," with a door knocker of the usual type in general use, and we so arrange the
mechanism according to our invention to allow the stroke of the knocker to operate the
hammer of a bell, which may be suspended by a strip of thin steel, or the like, so as
to continue the sounding of said bell by a series of vibrations, due to the elasticity and
rebound of said strip of steel, when said hammer is once set in motion by a blow
or stroke, this type of bell and hammer being generally known as a vibrating or
trembling bell."
66
In order that our invention may be the better understood we have appended the
accompanying sheet of drawings in which Figure 1 is a sectional view of the device
or contrivance according to our invention and Figure 2 is an elevation thereof, shewing
the method of attachment to the inside of a door, and Figure 3 is a view of
part of the details, shewn detached, and drawn to a larger scale, similar letters of
reference indicating corresponding parts in the several views.
E
In carrying our invention into effect we form the sounder B appertaining to a door
knocker with a hollow stud C, passing through the door A which is screwed externally
to allow of being firmly held in position by the nut D or any equivalent device for
be fixed
this purpose. Upon the end of the stud C, inside the door A, a cap may
by screwing or like means, this being slotted to hold a tongue piece F, which is
pivotted at a, shewn more particularly by Fig. 3. A pin bb' is placed longitudinally
in the bore of the hollow stud C, in such a manner that one end 6' thereof may project
and is thus maintained by the tension of a spiral spring; the other end 6 resting
against the tongue piece F, which carries a hammer H attached thereto by means of
an elastic piece of metal such for instance as a steel spring G, said hammer H being
adjusted so as to be within striking distance of the gong I, which is also screwed
upon the stud C, and serves as a lock to the screwed cap E thereby maintaining the
whole in position when once adjusted and so fixed. It is evident that the impact of
the blow in the ordinary application of the knocker K, is communicated to the pivotted
tongue piece F, causing it to move by reason of the pressure or stroke of the pin bb¹.
This movement is communicated to the hammer H by the spring G, and also by reason
of its elasticity causes the stroke given to the gong I by the hammer H to be vibratory
rather than incisive.
Although in the foregoing description we have described a special form of sounder B
we wish it to be understood that we may apply the device or contrivance according to
our invention to any style or type of knocker without rendering it necessary to make
considerable structural alterations therein.
We may also provide means for operating the vibrating bell hammer as shewn and
described, when the door is opened, employing in this case a spring trigger, communi-
cating with the tongue piece F by means of a wire or cord, which enables the door
when opened to actuate the hammer H in a similar way to the action caused by the
movement of the pin 6 b' as before described.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
:-
First, The application to a door knocker of a trembling bell hammer, actuated by
said knocker, substantially as and for the purposes herein described with reference to
the accompanying drawings.
Second, In an improved door knocker as above described, the employment of a
tubular stud C, cap E, tongue piece F, pin b 61 and vibrating hammer H substantially
as and for the purposes herein described and shown by the drawings.
Dated this 18th day of June 1880
FREDK. WALKER & HYDE,
4, Little Moorfields, London, E.C., Agents for the Applicants.