Improvements relating to Chiming the Quarters and Striking the Hours of Church-turret and House Clocks.
Year: 1898

page_text: Date of Application, 14th Nov., 1898
Complete Specification Left, 10th Aug., 1899-Accepted, 14th Nov., 1899
PROVISIONAL SPECIFICATION.
Improvements relating to Chiming the Quarters and Striking the
Hours of Church-turret and House Clocks.
I, JOHN GEORGE HENRY HOCH, of 311, Brixton Road, London, in the County
of Surrey, Clock Manufacturer, do hereby declare the nature of this invention
to be as follows:-
In this system of chiming the quarters and striking the hours of church-
turret and house clocks, I discard all the several wheels and their pinions, which
in both ancient and modern clocks lie between the great wheel of the quarter
chime, and the the great wheel of the hour striking, and their respective fly
wheels. I have one wheel for each respective part into which is geared an archi-
medial or endless screw for rotation, and to the arbor of which are fixed regulating
fans. This wheel of each part in connection with their respective endless screws
forms the principle of my invention, and may be adapted to the several orders of
clocks enumerated under the title of my invention.
1000
JOHN GEORGE HENRY HOCH,
Improvements relating to Chiming the Quarters and Striking the
Hours of Church-turret and House Clocks.
I, JOHN GEORGE HENRY HOCH, of 311, Brixton Road, London, in the County
of Surrey, Clock Manufacturer, 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:-
As stated in my Provisional Specification I dispense in this invention with
all the several wheels and pinions which in the striking parts of both ancient
and modern clocks lie in greater or lesser number between the main or great
wheel and the last or fly wheel and which wheels and pinions are commonly
called "train wheels." The resistance which these wheels and pinions exercise
on each other and their mainwheel I supply by gearing an endless or archi-
medean screw into a wheel which for the purposes of my invention I call here-
after the "archimedean wheel." For each striking part of a clock that is to
say the quarter chiming part and the hour striking part one archimedean wheel
and screw is required and these two of each part performing in the manner herein-
after set forth form the equivalent to the train wheels of ancient and present day
clocks. This one archimedean wheel and screw of each part forms the principle

page_text: of my invention and as both wheel and screw are capable of being made in various
sizes and diameters it is evident that this principle applies to the largest church
and turret clock as well as to the smallest house clock.
I will now describe the construction of the hour striking part of a clock having
a weight for its motive power, reference being had to Fig. 1, Sheet 1. A, the
archimedean wheel with 156 teeth, the circle (B) representing the usual click
wheel, the circle (C) the barrel which in house clocks must be of small diameter
(3 of an inch or less) but in church and turret clocks the size now in use would
be convenient. The archimedean wheel (A) has 26 projecting pins (g-g) on
its side to lift the striking hammer. For these pins in the case of church and
turret clocks the usual cam wheel with 26 cams is substituted. (Fig. 2, Sheet 2).
The single threaded archimedean screw (D), which is geared into the wheel (A),
is pivoted and runs in bearings (L-L) and as the action of the wheel (A) by its
motive or driving power presses the screw (D) upwards, the top of the upper
pivot of the screw is made to run against an endpiece (m). To reduce still
further this upward pressure a weight (E) is fixed in a convenient position to
the arbor of the screw (D). In the case of church and turret clocks the end-
piece (m) is omitted, but the weight on the arbor of the screw is made sufficiently
heavy as almost to balance the force or pressure which the wheel (A) by its
driving weight exercises on the screw. No certain rule can be laid down as to
the quantity of the weight required for the screw, especially in church and turret
clocks but the proportion between this weight and the driving power will be
about 1 to 30. (Fig. 2, Sheet 2.)
The archimedean screw is provided with adjustable fans (F-F) in the usual
manner.
Fig. 2 shows the arrangement as applied to the quarter chiming mechanism.
If the motive or driving power of the clock is to be a mainspring then a small
wheel (N) is fixed to the arbor of the archimedean wheel (A) (Fig. 3, Sheet 2). Into
this wheel (N) the ordinary barrel wheel (0) containing the mainspring is geared.
Only light driving weights or weak mainsprings are required for my clocks.
I have now described the construction of the chiming and striking parts of
my clocks and only have to add that the action of the archimedean wheel in
and on the screw being almost across the line of centres, the teeth of the wheel
gliding in an oblique direction upwards on the thread of the screw and the
reduction at a ratio of about one to three of the motive or driving power I
require for my clocks in contra-comparison with others, reduces the ordinary
wear and tear which two metals in moving contact with each other exercise upon
one another, to a minimum.
Finally I declare that I do not confine myself to the exact calculation, elevation,
shape or position of all or any of the several parts indicated in this specification
and the annexed drawings.
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—
First: The novel use of the archimedean wheel and screw in connection with
the quarter chiming, and hour striking parts of clocks.
wheels"
Secondly-The absence of various wheels and pinions, designated "train
in other clocks, the several functions of which I have gathered and
concentrated into one archimedean wheel and screw.
Thirdly: The consequent simplicity of mechanism.
Dated this Oth day of Awoust 1800