Improvements in or connected with Friction Gearing.
Year: 1898

page_text: Date of Application, 12th Jan., 1898-Accepted, 18th June, 1898
COMPLETE SPECIFICATION.
Improvements in or connected with Friction Gearing.
I, CHARLES ALFRED BAKER, of Waunarlwydd House, Gowerton, in the County
of Glamorgan, Wales, Electrical 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:-
1
My invention relates to a new or improved power transmitting device by means
of which certain advantages are obtained.
In order that my invention may be readily understood I append hereto a sheet
of drawings illustrating one typical form thereof, the said form giving good results
in practice.
In the said drawings,
Figure I is an end elevation, of the said form, and
Figure II is a sectional plan of same.
(a). Referring to the said figures, 1 and 2 are shafts the motion of either one
of which can be transmitted to the other and I shall hereinafter distinguish these
shafts from one another by terming them the "pulley shaft" and the "insertion
shaft" respectively. Upon the pulley shaft 1 are mounted the two pulleys 3 and 4.
Pulley 3, hereinafter termed the "outer pulley," has an internal working face 5
and pulley 4, hereinafter termed the "inner pulley," has an external working face 6.
The said working faces are inclined to one another as is shown in Figure II, that
is to say, the working face 5 is inclined inwards, whilst the working face 6 is
inclined outwards. One of the said pulleys is mounted fast upon shaft 1 whilst
the other pulley runs loose thereon. In the drawings, the inner pulley is shown
as fast and the outer pulley as loose, but, as will be hereinafter shown, this arrange-
ment may be reversed.
(6). Upon the insertion shaft 2 is mounted as shown the tapered block or friction
wheel 7, its working face being tapered or inclined in such manner as to correspond
with the space between the working faces 5 and 6 of the pulleys 3 and 4.
(c). The action of this form of my invention is as follows. Let us assume that
the inner pulley 4 is fast upon the pulley shaft 1 and that the outer pulley 3 is loose
thereon. If now it be desired to transmit power from the pulley shaft to the
insertion shaft all that has to be done is to move the insertion shaft (with or without
the machine to which it is attached) towards the pulleys (or vice versa move the
pulleys towards the insertion shaft) until block 7 is engaged between the working
faces of pulleys 3 and 4. Power is now transmitted from shaft 1 to shaft 2 by
means of pulley 4 and block 7, pulley 4 acting as a transmission pulley and pulley 3
as a guide wheel or holding up wheel.
(d). Similarly power can be transmitted from the insertion shaft 2 to the pulley
shaft 1 by insertion of block 7 as before. In this case power is transmitted from
shaft 2 to shaft 1 by means of block 7 and pulley 4, pulley 3 acting as in the former
case as a guide or holding up wheel.
(e). It is obvious that by fixing the outer pulley 3 upon shaft 1 and leaving the
inner pulley 4 loose thereon, pulley 3 becomes a transmitting pulley and pulley 4
a guide or holding up wheel.

page_text: (f). By mounting the outer pulley 3 fast upon shaft 1 whilst the inner pulley 4
is mounted loose upon the said shaft, and by passing a transmission belt over the
outer face of pulley 3, power can be transmitted by said belt from a motor to both
shafts 1 and 2, in which case the two shafts will rotate in the same angular direction,
pulley 3 serving as a transmitting pulley and pulley 4 acting solely as a guide
or holding up wheel.
(g). In the last case it is obvious that the angular velocity and also the direction
of rotation of shaft 1 is the same as that of the outer pulley 3, but if we mount
pulley 3 loosely upon shaft 1 and pulley 4 tight thereon then with belt driving as
before shafts 1 and 2 will be driven in opposite directions, the power being trans-
mitted from the belt to shaft 1 by pulley 3, block 7 and pulley 4. In this case both of
the pulleys act as transmitting pulleys.
(h). A similar result to that last hereinbefore described is obtained by severing
shaft 1 on the line X-X of Figure II so that pulleys 3 and 4 are on separate shafts
in line with one another and by mounting both pulleys tight upon their shafts.
(2). It is obvious that the dimensions of the pulleys 3 and 4 and of block 7 may
be varied to an indefinite extent and that by this means any desired ratio of trans-
mission may be obtained.
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-
1. The new or improved power transmitting device substantially as set forth.
2. In a power transmitting device the combination of a pulley shaft, two pulleys
mounted thereon, an insertion shaft and a block or friction wheel, substantially as
set forth.
3. In a power transmitting device the combination of the parts claimed in Claim 2
with a transmitting belt, substantially as and for the purpose set forth.
4. The specific form of my power transmitting device set forth with reference
to Figures I and II.
5. The specific form of my power transmitting device set forth with reference to
Figures I and II but with each of the two pulleys mounted fast on a separate
shaft, the said shafts being in line with one another, substantially as set forth.
Datod this 11th day of Janua
1848
Dated this 11th dov
anua
1898
For the Applicant,
JAMES G. LORRAIN, M.I.E.E., M.I.Mech. E.,
Norfolk House, Norfolk Street, London, W.C., Chartered Patent Agent.