Apparatus Connected therewith.
Year: 1885

page_text: Apparatus Connected therewith.
I HENRY MAGUIRE HOLDEN, of Saint Bartholomew's Vicarage, Bowling,
Bradford, in the county of York, Clerk in Holy Orders, do hereby declare
the nature of this invention to be as follows:-
My invention relates to improvements in that class of wheel-gearing in which
two sets of toothed wheels are employed, the first set driving the second by means
of an endless chain, and in which the speed at which the wheels are driven can be
changed without stoppage.
In order to carry out my improvements I employ for each of the two sets, two
or more toothed wheels, one set being by preference exactly similar to the other set
as regards the diameters of the toothed wheels, and the number and pitch of the
teeth of the same. I employ by preference an iron or steel endless chain, the edges
of which are parallel to one another and free from projections.
I form each toothed wheel somewhat wider than is necessary for the chain to
work upon, and this extra width or space is gradually cut away from the outer
circumference and side of the larger wheel, until an inclined surface is formed,
which reaches to the outer circumference of the next smaller wheel and upon this
inclined surface teeth are formed similar in size and pitch to the teeth upon each
of the wheels. One of these inclined surfaces formed as described and which has
a spiral outline intervenes between each adjoining pair of toothed wheels, and
thereby forms a connecting gradient, on to which the endless chain can pass
without check or obstruction when being moved from a larger on to a smaller
wheel or vice versa.
In order to move the chain in a lateral direction upon each set of wheels and.
thereby change the speed, I make use of forks or loops attached to a handle and
lever, which lever works upon a fixed pin or stud; by a slight side pressure of the
said forks or loops the chain can be moved up or down one of the inclined surfaces
on each of the sets of wheels, to the adjoining wheels, and the speed can be thereby
changed without stoppage.

page_text: Apparatus Connected therewith.
I, HENRY MAGUIRE HOLDEN of Saint Bartholomew's Vicarage, Bowling,
Bradford in the County of York, Clerk in Holy Orders do hereby declare
the nature of the said invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
My invention relates to improvements in that class of wheel-gearing in which
two sets of toothed wheels are employed, and in which the first set drives the
second by means of an endless chain and in which the speeds may be changed
without stoppage.
.
In order to carry out my improvements I form each of the two sets of two or
more toothed wheels, one set being by preference similar to the other in the number
and pitch of the teeth contained therein.
I make use by preference of an iron or steel endless chain, the edges of which are
parallel to one another and free from projections.
I form each toothed wheel rather wider than is necessary for the chain to work
upon and this extra width or space is gradually cut away from the outer cir-
cumference and side of the larger wheel, until an inclined surface is formed
which reaches to the outer circumference of the next smaller wheel and upon
this inclined surface teeth are formed similar in size and pitch to the teeth upon
each of the wheels.
One of these inclined surfaces, formed as described and which has a spiral
outline, intervenes between each adjoining pair of toothed wheels and thereby
forms a connecting gradient upon which the endless chain passes without check
or obstruction when being removed from a larger to a smaller wheel and vice versa.
In order to remove the chain in a lateral direction upon each set of wheels and
thereby change the speed I make use of forks or loops attached to a handle and
lever, which lever works upon a fixed pin or stud and by a slight side pressure of
these forks or loops the chain is moved to travel up or down one of the inclined
surfaces or gradients from one wheel to the adjoining one and the speed is thereby
changed without stoppage.
In order to enable this invention to be fully understood I will proceed to describe
the same with reference to the accompanying drawings in which
Figure 1 represents a side elevation of a set of toothed wheels constructed
according to my improvements with the toothed inclines for carrying the chain
from one speed to another. Figure 2 represents a plan of the same, Figures 3,
4, and 5 represent a side elevation, a plan, and a front elevation respectively,
of two sets of toothed wheels with my improvements, as described and geared
together by means of an endless driving chain.
Similar letters refer to similar parts in all the drawings. The largest toothed
wheel is represented at A the second size at B and the smallest at C.
The incline for conducting the chain from A to B has formed upon it teeth D
and the teeth E conduct the chain from the smaller wheel B to the larger A,

page_text: In a similar manner the teeth F conduct the chain from the wheel B to C or
from. C to B.
When the wheels are in motion, and connected by means of the driving chain G,
to change the relative speed of the wheels a lateral motion is given to the fork H
which is connected to a handle or lever.
In the fork H is mounted a small spur wheel K having teeth of the same size
and pitch as those in the sets of wheels hereinbefore referred to. The driving
chain G runs upon, and gears into this spur wheel K, and thereby a better hold
is obtained of the chain for the purpose of giving it the required lateral motion.
The fork H is curved over in the direction of the curve of the toothed wheels
and has an oblique lateral motion so as to remain as close as possible to the toothed
wheel, whether the chain is upon the larger or smaller wheel.
In changing the relative speeds of the two sets of wheels without stoppage,
two handles or levers are employed, in order to withdraw the chain from the
larger sized wheel first, before engaging it upon a larger sized wheel in the
opposite set.
The handles or levers by means of which the forks H are actuated, are so
constructed that they are held fast by means of a spring when the chain is fully
in gear upon any of the three toothed wheels.
It is not necessary that the opposing sets of wheels should be exactly similar in
size, but the size and pitch of the teeth must be similar and the sum of the teeth
geared together upon the two opposing wheels must be the same for each speed, as
the length of the driving chain remains constant.
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
1. The combination of toothed wheels and inclines or gradients for the purpose
of carrying the driving chain from one toothed wheel to another when lateral
pressure is applied to the chain, whereby when two sets of such wheels are
employed the relative speeds of the wheels may be changed without stoppage,
substantially as described and represented in the accompanying drawings.
2. The combination of the improved toothed wheels with inclines as described
and the fork with spur wheel for carrying the chain and changing the speed all
substantially as described and represented in the accompanying drawings.
Dated this tenth day of June 1886.