Improvements in Speed Gear, especially applicable to Velocipedes.
Year: 1893

page_text: Date of Application, 6th Apr., 1893
Complete Specification Left, 4th Jan., 1894-Accepted, 10th Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in Speed Gear, especially applicable to Velocipedes.
We, THOMAS BROADBENT of Summer Road, East Moulsey in the County of
Surrey, Engineers Tool Maker, and WILLIAM BROWN of Maidenhead Thicket
in the County of Berks, Carpenter do hereby declare the nature of this invention
to be as follows:-
Our invention has for its object the construction of a gear for velocipedes which
takes a direct central thrust or drive, thereby obviating all side twist and reducing
friction.
cup
The driving shaft rotates inside the driven shaft, the latter being hollow.
Between these two shafts runs two short sleeves which are enveloped by the driven
shaft and themselves envelope the driving shaft; they are fixed one at each end of
driving shaft, and one end of each sleeve is fixed solid to the bearings on fork or
frame of machine. The other end of each sleeve has each made solid with it a
shallow with flanges. These cups are made large enough to clear a spur
wheel
fixed to or made solid with driving shaft at its centre. The flanges on the cups are
for the purpose of fixing the two cups together and to support one or more sets of
pinions hereinafter described. The flanges and a portion of the cups are cut away
in one or more places to allow spur-wheel fixed to driving shaft to tooth into and
act upon the centre pinion of three pinions fixed solid together as in one piece.
One or more sets of pinions may be used for the same purpose, the whole toothing
into the same driving cogwheel and driven cogwheels.
These pinions or sets of pinions are inserted in the space or spaces cut away in
flanges and cups, and are mounted on an axle which is supported by the said flanges
and cups. The two outside pinions of the set or sets of three act upon and tooth
respectively into two toothed wheels fixed on driven shaft.
This outer or driven shaft is in two parts each part having fixed to it on the
inside end a toothed wheel which tooths into and is acted upon by the outer or
larger pinions.
The other or outside ends of this shaft take their bearing on balls running on
cones or ball races made solid with the bearings on fork of machine; it also forms
the hub of driving wheel of machine, being made in one piece with a cylindrical
shaped box which encloses the whole of the gear, thus joining the two parts of the
driven shaft together.
The above mentioned pinions may run on plain or ball bearings.
The driven shaft revolves faster than the driving shaft since the wheels upon the
former are smaller and have a less number of teeth than the wheel upon the latter,
and the pinions being made to tooth correspondingly.
THOMAS BROADBENT.
WILLIAM BROWN.
COMPLETE SPECIFICATION.
Improvements in Speed Gear, especially applicable to Velocipedes.
We THOMAS BROADBENT of Summer Road, East Moulsey in the County of
Surrey, Engineers Tool Maker, and WILLIAM BROWN of Maidenhead Thicket
in the County of Berks, Carpenter, 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 :-
The driving shaft rotates inside the driven shaft the latter being hollow, between

page_text: these two shafts is fixed two short sleeves encircled by the driven shaft and them-
selves encircling the driving shaft; one end of each sleeve is fixed to the driving
shaft bearings that are fixed to fork or frame of machine: the other, or inner end
of each sleeve, has, made solid with it a shallow cup, each cup having a flange on
the outer edge, these flanges are for the purpose of fixing the cups together with
screws or bolts passing through them and are to support one or more sets of pinions
hereinafter described. A portion of the flanges and cups are cut away in one or
more places to allow spur wheel on driving shaft to tooth into and act upon the
centre one of three pinions fixed solid together.
One or more sets of pinions may be used for the same purpose, the whole toothing
into the same driving cogwheel and driven cogwheels respectively.
The pinions or sets of pinions are mounted on bearings and are fixed longitudinally
in the spaces where flanges and cups are cut away. The two outside pinions of the
set, or sets of three pinions act upon and tooth respectively into two toothed wheels
fixed to driven shaft. This outer or driven shaft is made in three parts, two parts
having fixed to them on their inside ends a toothed wheel which toothes into and is
acted upon by the outside or larger pinions: the other or outside ends of these two
parts of driven shaft take their bearing upon flanges made solid with driving shaft
bearings fixed to fork or frame of machine, and have ball races made upon them.
The third or outer part of driven shaft is in the form of a tube or cylindrical
shaped box and combined with the other parts of same form the hub of wheel.
Figure 1 is a sectional view of the gear.
Figure 2 is an end view of cups and flanges H'H' and H³ H² Figure 1.
Figure 3 is a similar view of the bearing supporting pinions D, and E. E.
Figure 1.
Figure 4 is an end view of the hub or driven shaft looking from the left of
Figure 1, with fork bearing removed.
A Figure 1 is the driving shaft A'A' the two bearings in which it works.
AA are the two branches of fork of machine fixed to bearings A¹ A¹. B. B. are
two parts of driven shaft which when combined and fixed together with the third
part of same B' (which is in the form of a cylindrical shaped box or tube) it forms
the hub of wheel at the same time enclosing the whole of the gear. B¹ B³ are
the spokes of the wheel, C is the spur wheel fixed solid to driving shaft A. and
gearing with the centre pinion D. the latter is fixed solid together or made in one
piece with the pinions E. E. which gear respectively with the two spur wheels F. F.
screwed and keyed to parts of driven shaft B. B. G. G. are flanges and ball races
combined made in one piece with the case of bearings on fork A' A'. H, H, are
two sleeves having a thread on one end and screwed and keyed to flanges G. G.
HH' are two shallow cups made in one piece with the inner end of the two
sleeves H. H. and are made large enough to clear the spur wheel A. H² H³ are
flanges made in one piece with the cups H'H' and are fixed firmly together with
screws or bolts R. and upon which is mounted the ball bearing J. in which the
pinions D. and E, E, work on rings of balls K. K. rotating between the ball
races L. L. made between the pinions D and E. E. and L' L' in bearing J carried
jointly by flanges H² H' and cups H¹ H. M. M. are rings of balls working
between the outer ball races N. N. and the inner ball races O. O. and are made
adjustable by the ball races N. N. being made to screw in and out of driven
shaft B. B.
Figure 2 is an end view of cups H'H' and flanges H'H' shewing the portion
of same cut away to allow.spur wheel C Figure 1. on driving shaft A to tooth into
centre pinion D.
Figure 3 is a similar view of the ball bearing J with pinions E. E. removed and
which carry the set of pinions D and E. E.
Figure 4 is an end view of the hub or driven shaft looking from the left of

page_text: Figure 1. with fork bearing removed shewing screws P. used to fix part B₁ of
driven shaft or hub to parts B. B. of same thereby facilitating the taking off of the
driving wheel without taking the gear to pieces.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is.
1. The combination of a driving and a driven shaft, a toothed wheel fixed to the
former, and two smaller toothed wheels fixed to the latter: two short sleeves, each
sleeve being made solid at one end with a shallow cup, each cup having a flange on
its outer edge; a set or sets of three pinions mounted on a bearing or bearings
fixed to the said cups and flanges: the set or sets of three pinions are attached to
each other the centre one varying in size from the other two, so as to gear
respectively with the toothed wheels on driving and driven shafts, substantially as
described.
2. The combination of a driving shaft A, and driven shaft or hub B. B. B', working
one within the other, the latter being hollow and made in three separate parts: one
part B' taking the form of a cylinder or tube; the same being capable of connecting
and fixing the other two parts B. B. together; two bearings A'A' each having on
their outer case a flange G. G. and ball race 0. O: two short sleeves H. H. fixed
to same having each made solid with them on their inside ends a shallow cup H'H'
with flanges H'H' made in one piece with them; and mounted upon them on axis
or axes a set or sets of three pinions D and E. E.: three spur wheels C fixed to
driving shaft A, and F. F. fixed to driven shaft B. B. B¹; the pinions D, and E. E.
varying in size to correspond with the difference in the sizes of spur wheels on
driving shaft A, and driven shaft B, so as to gear accordingly and substantially as
described.
3. The combination of two sleeves, two cups, and two flanges, fixed or made solid
together, and capable of being fixed to, and supported at both ends by the bearings
fixed to fork or frame of machine, and between two shafts working one within the
other to support one or more sets of pinions substantially as herein shewn and
described, and for the purpose stated.
"
4. Speed gear substantially as shewn and described in drawings.
THOMAS BROADBENT.
WILLIAM BROWN.