Improvements in Toothed and Chain Gear.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in Toothed and Chain Gear.
I, JEAN MARIE MORET, of 9, Rue Morand, Besançon, (Doubs), in the
Republic of France, 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 and accompanying drawing that is to say :—
This invention relates to a novel system of moveable teeth applicable to toothed
gear of all kinds, and to pitch chains which sometimes take the place of such gear.
The moveability of the teeth may be effected in different ways, whilst they may
be brought into gear at the proper times either by their own weight, or by springs.
In the improved system of moveable teeth, ratchet teeth are used. The
moveability of the teeth allows the gear wheels to which they are applied to
remain independent of each other when required which in many cases offers many
advantages over ordinary gear.
As the shape of the gear wheels with moveable teeth will vary according to
the purpose and conditions in which they are to be used, the accompanying.
drawing which is in illustration of the invention shews some of such forms and
constructions of the novel gear by way of illustration only, but it is to be
understood that they may be greatly varied and modified without departing from
the principle of the invention.
Figure 1 is a front view of gear wheels, with moveable teeth.
Figure 2 is a section through the line I-I, Fig. 1.
These two figures shew a toothed wheel with moveable cylindrical teeth a, the
ends of which are of somewhat reduced diameter, and can slide in the suitably
inclined grooves or slots c made in the two parallel rings d, d', which are fixed
together by bolts e.
The space between the two rings which is necessary for the free passage of the
fixed teeth upon the wheel with which the first wheel gears is obtained by means
of a plate g, or of arms meeting and joining at the centre.
As soon as the wheel with the moveable teeth is driven at a greater speed than
the wheel with fixed teeth, the cylindrical teeth a are forced up, sliding in the
slots c, by the wheel with the fixed teeth, the teeth a afterwards falling back by
their weight into proper gear with the wheel having the fixed teeth.
The latter wheel therefore may be stopped for a time whilst the wheel with the
moveable teeth continues its movement from the impulse which it has received.
Figures 3 and 4 are respectively an elevation and a section on the line 2-2, of
a gear wheel having moveable teeth a also cylindrical.
The wheel or pinion with the fixed teeth (shewn broken off) is however in this
case an internal one, its teeth gearing with the inner side of the moveable teeth.
Figure 5 shews an elevation and Figure 6 a section on the line 3-3, of a gear
wheel wlth moveable teeth a, each tooth turning upon an axis h fixed in the two."
rings d, d, which have sufficient space between them to allow the free movement
of the teeth a.
The lower part of the tooth a is heavier than its upper part, so that its tendency
is always to fall into the proper position to gear with the fixed teeth, (which are
shewn upon an internal wheel). The upper part of the tooth abuts against a
plate g or a ring carried by the centre, so that the proper position of the teeth is
ensured.
Figure 7 is an elevation, and Figure 8 a section on the line 4-4, of a modified
form of the gear in which the moveable tooth a and its axis k are in one piece, the

page_text: axis moving in holes i in two plates 1, 1, which constitute a curved rack. When
the rack moves down, the heavier part of the tooth a is raised by the fixed teeth f
upon the wheel or pinion with which the rack gears, which wheel continues its
revolution from the impulse which it has received, in the upward movement of the
rack, during which last mentioned movement the upper part of the moveable tooth,
abutting against a stop (which in the figure is shewn as a cylindrical crosspin ni
fixed in the side plates 1, 1) forcibly carries forward the fixed teeth upon the
pinion, and gives the latter its impulse.
Figure 9 shews an elevation, and Figure 10 a transverse section on the line 5-5,
of gear in which the moveable tooth a is carried upon an axis b forming part of it.
At its upper part the tooth is provided with a spring n which enables the gear
to be arranged in a horizontal or other position, instead of vertically, the spring
acting upon the tooth, instead of the weight of the latter bringing it to its
position.
Figure 11 is a front view, and Figure 12 a transverse section on the line 6-6,
of a form of the gear in which the tooth a is formed of a cylindrical pin sliding
in two grooves c (as in Figures 1 and 3).
These cylindrical pins are kept in the said grooves by two sheet metal rings o, o',
fixed to the rings d, d', in which the grooves or slots c are made, the outer sides
of which are therefore closed.
This system of gear with moveable cylindrical teeth, may be arranged to work
in a horizontal position, by the use of a spring ring p arranged inside, which keeps
each pin in its proper place, except when it is forced back by the fixed teeth f
of the other gear wheel.
Figure 13 shews an elevation, and Figure 14 a transverse section on the
line 7-7, of a "pitch" or gear chain having moveable cylindrical teeth a sliding
in grooves c, the central part of the pin being reduced in diameter.
The two outer ends b, of each tooth gears with the fixed teeth upon a wheel
formed of two plates, or having a deep groove round its circumference. The
other of the wheels round which the chain passes is plain but is provided at each
side with a thin metal ring, the rings guiding the chains upon the wheel.
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 :-
In the novel system of toothed gear with moveable teeth,
1. The combination of two rings connected together but kept at a sufficient
distance apart by means of a plate, substantially as and for the purpose described
and illustrated.
2. The combination of the rings described in Claim 1 and provided with grooves
or slots, with cylindrical pins forming teeth, substantially as described, and
illustrated in Figures 1, 2, 3, and 4.
3. The combination of rings provided with holes, with moveable teeth having
axes fitting in the said holes substantially as described, and illustrated in
Tier 7 8 0 and 10
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Applicant.