Improvements in Mechanism for Actuating the Heckle Bars of Gill Boxes.
Year: 1886

page_text: Date of Application, 18th Oct., 1886
Specification Accepted, 18th Nov., 1887
COMPLETE SPECIFICATION.
Improvements in Mechanism for Actuating the Heckle Bars of
Gill Boxes.
We, ISIDORE WILLEMS and EDOUARD DEPOORTER both of Tourcoing in the
Republic of France, Inventors 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 :-
In our previous patent No. 11844 of October 5th 1885, we described and claimed
a means of actuating the heckle bars of gill boxes by means of wheel gearing and
helicoidal cams, for the purpose of raising the heckle bars from the lower to the
upper position, and vice versa.
Before the date of this patent, simple or double-headed screws with ordinary simple
or double headed cams were the only ones in use.
The object of the present application for Letters Patent is to secure the application
on our improved system of gill boxes of helicoidal cams with multiple steps and
helices, and especially of triple helicoidal cams, that is to say with three steps and
three helices, producing three movements at each rotation, which we find in practice
to be an improvement upon our original invention.
Referring to the accompanying drawings, the triple cam shewn in Figures 1 and 2
is composed of a central boss, screw threaded internally, and provided with three
arms at an angle of 120 degrees to one another, each arm forming a cam, the outline
of which is preferably that shewn most clearly in Figure 1, and of which the one of
the lateral faces is helicoidal the other face being plane.
In the case of the triple cam shewn in Figures 3 and 4, the system is also composed
of a central boss, screw threaded internally, and provided with three cams, one face of
each of which is helicoidal, whilst the other is plane; but the arms in place of being
so cut out in their outline as to shew a vacant space close to the boss, are so formed,
that the triple cam in plan or face view, Figure 3, shews no vacant spaces.
The cams can of course occupy the same position in a machine as those shewn and
described in the patent above referred to, namely No. 11844 of 1885. Their action
on the fallers is of course proportional to the number of arms with which the cam is

page_text: provided; for example, in the case of a triple cam there are three up and down
movements of the fallers.
The cams shown on the drawings can be used either for raising the fallers or for
lowering them. We do not give preference to one design for lifting, and to the other
for lowering. Either fulfils these two purposes.
Having now particularly described and ascertained the nature of our said invention,
and in what manner the same is to be performed, we declare that what we claim is :-
:-
In mechanism for actuating gill boxes, the use of multiple and especially triplex
helicoidal cams, substantially as and for the purpose described.
Dated this 16th drew of Antho 1000
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Patent Agents for the Applicants.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Patent Agents for the Applicants.