Year: 1887

page_text: Date of Application, 20th June, 1887.
Complete Left, 26th Aug., 1887.
Complete Accepted, 27th Sept., 1887.
I, ERNEST DE PASS, of 68 Fleet Street in the City of London, Fellow of the
Institute of Patent Agents, do hereby declare the nature of this invention to be as
follows:-
This Invention consists in a chronograph mechanism of a very cheap construction,
in which the hand of the chronograph is directly acted upon by a wheel fixed to the
axis of the second wheel of the train, without any intermediate transmission.
The accompanying drawings shew a chronograph mechanism constructed according
to this invention.
The push piece which acts upon the nut G, and the corresponding spring are not
shewn in the drawings, being of the usual construction.
Fig. 1 is a top-view of the general arrangement of the chronograph mechanism,
and Fig. 2 shews, on an exaggerated scale, the section of the pinion of the first wheel
(centre wheel) of the works, with the axis of the chronograph hand traversing the
same.
Upon the axis A, of the second wheel, there is fixed a fine-toothed chronograph
wheel B, which turns continuously with the axis A.
The pinion Cof the centre wheel (or first wheel) is traversed by the axis D, the
pivot d, of which traverses a little sleeve or plug c, inserted into C, and carries the

page_text: hand E of the chronograph. The axis D also carries a fine-toothed pinion H and an
eccentric I, the latter being acted upon by a lever J, when the chronograph hand is
to be set at rest. This lever J is acted upon, as usually, by the nut G. The other
end of the axis D is provided with a pivot d', turning in the oscillating bridge F.
This latter oscillates about a screw f, and has a projection F¹, which bears alternately
upon a full part, or in a notch of the nut G.
According to the position assumed by the bridge F, the pinion H is brought into
or thrown out of gear with the wheel B, that is to say, that the chronograph hand E
is put into action, or stopped, by displacing the oscillating bridge F.
A spring M presses the bridge F in the direction of the wheel B, and thereby
causes the pinion H to be put into gear with the wheel B, as soon as the projection F¹
fall into one of the notches of G.
A friction spring K bears continually against the axis D and acts like a break
when the pinion H is out of gear. Fig. 2 shews the axis D in this position.

page_text: Improvements in Chronograph Mechanism.
I, ERNEST DE PASS, of 68 Fleet Street in the City of London, Fellow of the Institute
of Patent Agents do hereby declare the nature of said Invention and in what manner
the same is to be performed to be particularly described and ascertained in and by the
following statement reference being had to the drawings filed with my Provisional
Specification that is to say :-
This invention relates to a chronograph mechanism of a very cheap construction in
which the hand of the chronograph is directly acted upon by a wheel fixed to the axis
of the second wheel of the train, without any intermediate transmission.
The drawings left with my Provisional Specification shew a chronograph mechanism
constructed according to the Invention.
The push piece which acts upon the cam G and the corresponding spring are not
shewn in the drawings, being of the usual construction.
Fig. 1 is a top view of the general arrangement of the chronograph mechanism and
Fig. 2 shews, on an exaggerated scale, the section of the pinion of the first wheel
(centre wheel) of the works, with the axis of the chronograph hand traversing the
same.
Upon the axis A of the second wheel there is fixed a fine-toothed chronograph
wheel B, which turns continuously with the axis A.
The pinion C of the centre wheel (or first wheel) is traversed by the axis D, the
pivot d of which traverses a little sleeve or hollow plug e inserted into the bore of (),
and carries the hand E of the chronograph. The axis D also carries a fine-toothed
pinion H and an eccentric I, the latter being acted upon by a lever J when the
chronograph hand is to be set at rest. This lever J is acted upon, as usually, by
the cam G. The other end of the axis D is provided with a pivot d', turning in the
oscillating bridge F.
This latter oscillates about a screw f, and has a projection F' which bears alternately
upon a full part, or in a notch of the cam G.
According to the position assumed by the bridge F, the pinion H is brought into
or thrown out of gear with the wheel B, that is to say, the chronograph hand is put
into action, or stopped, by displacing the oscillating bridge F.
A spring M presses the bridge F in the direction of the wheel B, and thereby
causes the pinion H to be put into gear with the wheel B, as soon as the projection F
falls into one of the notches of the cam G.

page_text: A friction spring K bears continually against the axis D, and acts like a break
when the pinion H is out of gear. Fig. 2 shews the axis in this position.
Having now particularly described and ascertained the nature of the invention and
in what manner the same may be performed I claim, as communicated to me by my
foreign correspondents:
The improved chronograph mechanism in which the second wheel actuates directly
and without intermediate gearing a wheel on the axis of the chronograph hand, said
second wheel being thrown into or out of gear by an oscillatory movement of said axis,
the upper extremity of which is carried by an oscillating bridge which bears against
the cam, substantially as herein described and shewn in the drawings.