Improvements in the Transmission of Power from One Shaft to Another.
Year: 1897

page_text: Date of Application (in the United Kingdom). 2nd Jan., 1897
Complete Specification Left, 2nd Jan., 1897-Accepted, 20th -Mar., 1897
COMPLETE SPECIFICATION.
Improvements in the Transmission of Power from One Shaft to
Another.
I, JULES BARAT, of 14, Boulevard Poissonnière, Paris, in the Republic of
France, Engineer, 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 :-
My invention relates to the transmission of motion and power from one shaft to
another arranged at an angle to it the said invention being more particularly
designed as a substitute for bevel wheels in the case where shafts are arranged at
right angles to one another.
According to my invention the two shafts, or sleeves keyed upon the adjacent
ends of these shafts, are formed with an equal number of longitudinal holes placed
upon circles of the same radius upon the two shafts. Angle pieces with rigid or
jointed arms which are preferably cylindrical in shape and either solid or hollow
are arranged so that their two arms engage with two corresponding holes in the
two shafts. If one of the shafts be caused to rotate the other has communicated
to it a movement of rotation at the same speed whilst the arms of each angle piece
simultaneously a quire an alternating rectilinear movement which causes them to
enter deeper into their holes when the said holes approach one another and to.
The
project farther from the said holes as the latter recede from one another.
holes can be replaced by hollow longitudinal ribs or by guides or sockets arranged.
around the circumference of the shafts. In these holes or guides there may be
arranged balls designed to facilitate the movement of the angle pieces.
In the accompanying drawing I have shewn my invention by way of example as
applied to the transmission of power and motion between two shafts A and B
arranged at right angles to one another.
Figure 1 is a sectional elevation of the arrangement :
Figure 2 is a plan:
Figure 3 is a side view.
Figure 4 is a sectional elevation of a slight modification:
Figure 5 is an end view of a shaft provided with longitudinal ribs :
Figure 6 is a side elevation of the same.
The two shafts are assumed to be of relatively small diameters so that sleeves C
and D are keyed upon the adjacent ends of the shafts A and B respectively the
said sleeves being formed with holes similarly to the barrel of a revolver.
The holes c and d are formed accurately and parallel to the axes of the shafts C
and D respectively. They are préferably arranged in each sleeve around the,

page_text: circumference of a circle the radius of which is as large as possible so as to increase.
the lever action of the angle pieces.
The circle passing through the axes of the holes in one sleeve has the same
radius as the circle passing through the axes of corresponding holes in the other
sleeve the holes of a set in one sleeve being arranged at the same angular distances
apart as the holes of the corresponding set in the other sleeve. The holes are also
preferably arranged at the same angular distance from one another but this is not
essential to the proper working of my gear.
In the case shewn in the drawing, that is to say, when a sleeve or ribs is or are
arranged on the end of each shaft the holes in the sleeves or ribs pass right
through the same.
Considering the vertical plane passing through the axes of the shafts A and B
the cylindrical ends of the arms m, n, m, n¹ of angle pieces of metal or of any
other suitable material are caused to engage in holes c and d placed upon radii
making the same angle with, and on the same side of, this plane.
In Figures 1, 2 and 3 the holes are shewn arranged in each sleeve on the
circumference of the same circle. In Figure 4, however, the holes are arranged
on circles of different radii.
In the arrangement shewn in Figures 5 and 6 the sleeves are replaced by a series
of longitudinal ribs r, r formed with holes r, in which the arms work, as in the
case of the sleeves.
It will be obvious that the arms of the angle pieces can be of the same or of
different diameter.
The shafts A and B being supported by bearings and arranged upon balls or
brasses when a movement of rotation is communicated in any manner to either one
of them the angle pieces act simultaneously in the holes of the other and cause it
to rotate. During this rotation the angle pieces receive a to-and-fro motion as the
two sets of holes in which their arms are engaged approach and recede from one
another.
The movement takes place without noise and is even quite silent if suitable
linings are provided in the holes c and d. The rods of the angle pieces are
arranged to move freely in their boles but they should not, however, have too
much play.
Whatever be the dimensions of the shafts and of the angle pieces it is:
indispensable to the efficient working of the gear that the construction of the
operative parts be arrived at with precision. But when these conditions are
fulfilled the operation is perfect and is in every case much superior to that of
bevel wheels.
It will be understood that the angle pieces operate simultaneously and that each
assists in transmitting force whilst in bevel wheels the force is tangential and
applied upon a single tooth which is frequently broken thereby particularly on
starting. Moreover, when a tooth is broken in a bevel wheel the gear must be
stopped and the whole wheel replaced whilst with my arrangement one or more
angle pieces can be removed without the necessity of stopping. It will also be noted
that, should an angle piece be broken, it is very easy to repair the accident as it is
only necessary to remove and replace the broken piece.
My method of transmitting power can be applied equally well for large work as
for small. It may be used with machine tools, with various other machines, motor
cars, lifts, bicycles, in watch-making etc. In its application to velocipedes it
enables the chain to be dispensed with and very conveniently replaces the bevel
gear the great disadvantage of which is that it does not permit of abruptly
starting and stopping as all the strain is on a single tooth. It will be understood
that in each particular case the employment of my gear is independent of the mode
of propulsion or of multiplication of the driving shaft.
It is also to be understood that the different parts of my gear can have different
forms and dimensions and that they can be made of any suitable material according
to the particular use to which the gear is to be put. The shafts and angle pieces

page_text: may be of metal, wood, ebonite of any other material or composition and the holes,
the diameters of which depend upon the power to be transmitted, may be variable
in number.
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 herein before described means for transmitting power and motion from
one shaft to another arranged at an angle to it, the said means being designed more.
particularly to replace bevel gear on shafts arranged at right angles to one another,
and consisting in providing the ends of the two shafts, or of sleeves keyed upon.
the adjacent ends of these shafts, with a number of longitudinal holes around the
circumferences of circles of the same radius on the two shafts and in causing the
ends of rigid or jointed angle pieces to engage in the corresponding holes of
the two shafts, substantially as described and- illustrated in the accompanying
drawing.
2. In power transmission gear of the kind described in Claim 1 forming the
ends of the shafts with hollow longitudinal ribs upon their peripheries or with
sockets or guides fixed upon the said shafts for receiving the arms of the angle.
pieces as described.
3. In power transmission gear of the kind described in Claim 1 a rigid angle.
piece having cylindrical arms of the same or of different diameter as described.
4. In power transmission gear of the kind described in Claim 1 an angle piece-
having cylindrical solid or hollow arms jointed to one another as described.
Dated this 2nd der of January 1897
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.