Improvements in Escapements for Clocks and Watches.
Year: 1897

page_text: Date of Application, 28th May, 1897--Accepted, 30th Oct.,
1897
COMPLETE SPECIFICATION.
Improvements in Escapements for Clocks and Watches.
I, PAUL PERRET, Watch Manufacturer, of Rue Leopold Robert 68, La Chaux-
de-Fonds, in the Republic of Switzerland, 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 this improved construction of escapements for clocks and watches
is to avoid the defects in anchor and chronometer escapements whilst still utilising
their good qualities. According to this invention, the direct impulse of the escape
wheel acts on the balance and avoids the transmission of energy by the projections
of the anchor and the fork. The fork is used for the disengagement of the teeth
of the escape wheel and for effecting the reversal of the balance wheel, and dis-
penses with the delicate functions of the springs in the chronometer escapements.
The anchor and the fork are simple interruptors of movement acting with a
minimum of force and possessing a complete certainty in action.
The necessity of oiling, which is absolute for the regular working of ordinary
anchor escapements is greatly reduced in this arrangement.
In the accompanying drawings Figs. 1 and 2 are elevations of an escapement
constructed according to this invention, a part only of the escapement wheel being
shown.
Fig. 1 shows as an example the escapement wheel when it is about to be released
from the pallet G to give an impulse to the roller e through the indent e². During
this impulse the tooth d on the small roller e¹ takes the fork to such a position
that the tooth a falls on the face of the pallet g¹ without being able to engage
on the inclined plane of the pallet G¹.
In the return oscillation the finger d on the small roller e¹ effects the disengage-
ment of the tooth a of the wheel with the face of the pallet G¹. The anchor is
then rotated by the action of the tooth a on the inclined face n of the pallet G¹
until the pallet G engages the tooth a¹.
The axis of the balance also acts as a roller, its indentation s allowing the passage
of the finger g.
In this escapement the pallets G G¹, the indentation on the plate and the
finger, may be of hard stone.
The resistances act close to the axis whilst the impulse is given on a large
roller.
The number of teeth in the wheel and the proportions between the different
levers may be modified.
This escapement is easy to manufacture and requires less perfection in setting
than anchor or release escapements. It may be made for various watches including
those non-magnetisable, and for clocks.
Having now 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 :-
1. An escapement characterised by an anchor with two rests, fixed on the axis
of a fork, and comprising a pallet such as G, and another G¹ with inclined plane n

page_text: arranged so as to release, at the desired moment, the escape wheel which acts
directly in the indentation of a roller e which is placed in such manner as to
impart by a tooth acting on the horns of the fork a reciprocating movement; a
finger and an indentation s being combined to regulate the movement of the said
fork substantially as described.
2. The improvements in escapements for clocks and watches substantially as
described.
Dated this 28th day of May 1897
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.