IMPROVEMENTS IN CLOCKS
Year: 1884

page_text: COMPLETE SPECIFICATION.
I FERDINAND BOSSHARDT of the firm of Bosshardt & Grant, Mechanical &
Consulting Engineers and Patent Solicitors of 24 & 32 Bulls Head, Exchange
Chambers Market Place Manchester in the County of Lancaster, do hereby declare
the nature of my Invention for IMPROVEMENTS IN CLOCKS" and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
The novel features of this Invention consist, first, in dispensing with the fan or
fy and escapement wheel usually employed in clocks and obtaining the action
produced by such parts from a lifting wheel provided with pegs and ratchet teeth
in combination with a shaft provided with a recessed part through which the ratchet
teeth are allowed to pass when required.
Secondly, In suspending the hammer and retaining the same when at rest by
means of a catcher, the former, when disengaged, swinging against the pegs of the
lifting wheel, which causes the hammer to be thrown or swung against the bell
instead of letting the hammer rest on a pin fixed to the frame.
>
Thirdly, in retaining the striking mechanism or hammer by means of a catcher
consisting of two lever arms of which the top one is loose resting on a separato
catch lever arm, which when caused to drop arrests the striking mechanism, catching
and holding a pin fixed to the hammer instead of employing a lock or rack lever.
Lastly, forming the disc with projecting teeth instead of recesses, which prevents
a great deal of friction hitherto experienced caused by the locking lever resting in
the same.
And in order that my Invention may be be better understood I have caused to
be appended hereunto one Sheet of Drawings marked with letters of reference,
corresponding letters indicating like parts in various Figures.
Fig. 1 on the said Drawing represents a front view of the clock-work, yearly
winding-up, with dial removed.
Fig. 2 a back view showing the striking mechanism.
Fig. 3 also a back view showing the striking mechanism at work.

page_text: is at rest.
Fig. 5 shows the position of lifting wheel and shaft when the striking mechanism
Fig. 6 shows the position of lifting wheel and shaft when the striking mechanism
is nt work.
The striking mechanism of clock constructed according to this my Invention
requires for a yearly winding up, four, monthly threo, and daily only two, wheels.
The striking part in a clock for yearly winding up consists of four wheels of
which the spring casing a gears into the pinion b, while the intermediate wheel c,
by means of the pinion & moves the wheel e, the latter gearing into the pinion f of
the lifting wheel g.
The latter is provided on its inner side with lifting pegs h and at the periphery
with ratchet teeth i corresponding in number with the said lifting pegs.
A bracket being screwed to the front and back frame of the clock carries a
shaft in such a manner that its centre lies exactly in the periphery of the point
of the ratchet teeth i, see Figs. 5 & 6. of the lifting wheel. The shaft lis
recessed in order to allow the teeth i to pass when the striking mechanism of the
clock is at work (see Fig. 6.) After the striking has taken place, the next following
tooth of the wheel g and with it: the striking mechanism, will be arrosted on
account of the said tooth coming into contact with the back of the recessed part m
of the shaft Z.
The latter is provided at one end with a ratchet powl p fixed thereon and on
the other end with the rod n of hammer o, which is suspended therefrom.
The rod has at its lower end a pin fixed thereto, which when the hammer is to
be arrested, is caught by the catch lever arms s and t. The lower arm of the latter
is fixed upon the shaft while the upper arm oscillates loosely on the said shaft.
The extremity of the arm t is provided with a slide piece w which is moveable
and falls back as soon as the pin enters between the catch lever thus closing the
latter catching the pin and retaining the hammer. The pin x fixed on the top
of the arm t has for its purpose to prevent the levers & &t from closing wholly in
order that the pin r may pas between. After the pin r has been disengaged and
in order to keep the catcher open, another lever förming a powl and catch y is
arranged on a pin fixed to the frame in such a manner that when opening, the
arm t, the extremity of the arm t, will lay itself into the recess α, where it will
be retained until the next tooth of the disc d' will engage the top end e¹ of the
lever y and after which by the return motion of the lever y will cause to drop
again the arm t and close the hammer catcher. The disc d' is different from those
în uso previous to my Invention, as it is provided with teeth b¹ instead of with
recesses in order that no friction may be caused as has been the case heretofore.
The top end of the hammer rod is provided with a balance weight g¹ to regulate
the swing of the hammer.
WORKING OF THE STRIKING MY & STOM

page_text: the next tooth b¹ of the disc d throws back the lover y, and the arm & thus
dropping closes the hammer catcher and retains the hammer rods n by engaging
the pin r.
.
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 :-
A striking mechanism without fan or fly and escapoment wheel and a suspended
hammer, consisting of the following parts carried by a bracket fixed to the front
and back frame of a clock.
1st The shaft provided with a recess m and pawl p.
2nd The lifting wheel g provided on its periphery with ratchet teeth i and on
its outer side with lifting pegs in combination with the shaft & in substitution
of van or fly and escapement wheel.
3rd The hammer o suspended on the shaft by means of the rods n and balance
weight for the purpose of regulating the swinging motion of the same pin 7.
4th In substitution of the lock or racking lever employed heretofore, the hammer
catcher consisting of the arms & &t, the bottom arm s being fixed to the shaft while
the top arin provided with the pin x and sliding piece w is arranged to oscillate
on the shaft in order that when ascending, it will be lifted onto the catch a³ of
lever y and rest thereon until the retaining of the hammer o takes place.
5th The disc d' provided with ratchet teeth b' engaging the lever y as described
for the purpose set forth.
Dated this Oth day of June A.D. 1884.