IMPROVE- MENTS IN CHAIN WHEELS OR OTHER TOOTHED WHEELS
Year: 1887

page_text: Date of Application, 23rd Apr., 1887
Complete Left, 1st Oct., 1887
Complete Accepted, 1st Nov., 1887
I LUKE BARLOW of Rock Street Bury Road Haslingden in the County of Lancaster
Mechanical Engineer, do hereby declare the nature of said Invention for IMPROVE-
MENTS IN CHAIN WHEELS OR OTHER TOOTHED WHEELS, to be as follows:-
My improvements relate to chain or other toothed wheels made in two or more
pieces the chief object of my Invention being to construct a wheel in such manner
that the rim can move or yield more or less as desired when subjected to sudden
shock or strain and further in the case of chain wheels to enable the toothed rims to.
be changed when an alteration in the number of teeth is necessitated by the stretching
of the chain or from any other cause.
In one construction of chain wheel I form the boss preferably of two pieces bolted
together and secured to the axle or other shaft. The rim of the wheel with the teeth
is also unde in two or more pieces provided preferably with a web on one side fitted
over and on to the boss and with flanges through which are passed the bolts for
securing together the pieces which compose the rim. The other side of the wheel
is covered by a plate made in two or more pieces and thus a box is formed between.
the sides of the wheel; in this box are placed four or other suitable number of
strong spiral or other springs by which motion is communicated from the rim to
the boss and axle to which it is keyed the ends of each spring bear against the boss
and a suitable projection or ledge made for the purpose on the rim of the wheel.
When a sudden shock is thrown upon the wheel the springs allow the rim to
move a sufficient distance to neutralize the shock as soon however as the effect of
the shock is overcome the springs aid the boss and rim in regaining their normal -
relative positions.
In a modification of my Invention I make the wheel in pieces somewhat similar
to that described but in this case I employ two or more helical or spiral springs
arranged to act in opposite directions one end of each spring is secured to the
divided boss and the opposite end of each spring is secured to the divided rim which
when subjected to a sudden shock is thus free to move partly round independently
of its boss or axle.

page_text: In an alternative arrangement I make the boss in two pieces one side or cover in
two pieces with an annular flange near its periphery to carry the toothed rim which
is also made in two pieces and held in position by the edge of the plate which
constitutes the second side of the wheel aided by keys made with or secured to the
toothed rim and fitted in recesses made for the purpose in the flange on which the
rim is fitted. Springs are employed preferably four in number placed between
the boss and suitable projections on the first mentioned side or cover this sido has
flanges through which the bolts for securing it together are passed.
The action of this wheel under violent shocks is like that previously described but
the construction is such that the separate toothed rim can be readily removed and
changed say for one with a smaller number of teeth in it thus accomodating the
pitch to a chain which has stretched after wear.
By making the wheels in separate pieces as described they can be placed upon or
removed from any axle or shaft without removing other wheels or taking the shaft
out of its bearing it is obvious however that the boss might be made solid or in one
piece and one side cover might be in one piece for some positions.
My improved chain wheels are particularly adapted for use in tramcars driven by
dynamos compressed air gas steam or other portable power or they can be employed
as tooth geared wheels without the intervention of a chain.
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page_text: Improvements in Chain Wheels or other Toothed Wheels.
I LUKE BARLOW of Rock Street Bury Road Haslingden in the County of Lancaster
Mechanical Engineer, do hereby declare the nature of said Invention for IMPROVE-
MENTS IN CHAIN WHEELS OR OTHER TOOTHED WHEELS, and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :-
My improvements relate to chain or other toothed wheels made in two or moro
pieces the chief object of my Invention being to construct a wheel in such manner
that the rim can move or yield more or less as desired when subjected to sudden
shock or strain and further in the case of chain wheels to enable the toothed rims to
be changed when an alteration in the number of teeth is necessitated by the stretching
of the chain or from any other cause.
And in order that my Invention may be fully understood and readily carried into
effect I will describe the accompanying three Sheets of Drawings reference being
had to the figures and letters marked thereon.
Figure 1 is a side elevation with part of the cover_removed of one construction
of chain wheel made according to my Invention and Figure 2 is a section taken on
the line A B Figure 1.
Figure 3 is a side view and Figure 4 a transverse section of a modified construction
of chain wheel made according to my Invention.
Figures 5 and 6 are similar views respectively to Figures 3 and 4 showing an
alternative construction of the chain wheel illustrated by the said Figures.
In the construction of chain wheel illustrated by Figures 1 and 2 I form the boss
preferably of two pieces bb bolted together and secured to the axle or other shaft a.
The rim of the wheel with the teeth is also made in two (or more) pieces cc
provided preferably with a web c² on one side fitted over and on to the boss and with
Hanges through which are passed the bolts c¹ for securing together the pieces which
compose the rim. The other side of the wheel is covered by a plate made in two (or
more) pieces dd and secured to the flanges or projecting lugs c of the rim cc¹ by
bolts and thus a box is formed between the sides of the wheel; in this box are
placed four or other suitable number of strong spiral (or other) springs the ends
of each spring bear against the boss bb¹ and a suitable projection or ledge such as
one of the projections made for the purpose on the rim of the wheel so that motion
is communicated from the rim cc' to the boss band the axle a to which the boss is
keyed.
When a sudden shock is thrown upon the wheel the springs fallow the rim cc' to
move a sufficient distance to neutralize the shock as soon however as the effect of the
shock is overcome the springs f aid the boss 661 and rim cc' in regaining their
normal relative positions.
•
.
In the modification of my Invention illustrated by Figures 3 and 4 I make the
wheel in pieces somewhat similar to that described but in this case I employ two or

page_text: more helical (or spiral) springs f¹ and 9 arranged to act in opposite directions one
end of each spring is secured to the divided boss b or b¹ and the opposite end of
each spring is secured to the divided rim cc which when subjected to a sudden shock
is thus free to move partly round independently of its boss or axle.
In the alternative arrangement shown in Figures 5 and 6 I make the boss of the
wheel in two pieces 6 and 6' one side or cover of the wheel in two picces jj₁ with a
flange near its periphery to carry the toothed rim cc' which is also made in two
pieces as before and held in position by the edge of the plato dd which constitutes
the second side of the wheel aided by keys k made with or secured to the toothed
rim cc and fitted in recesses made for the purpose in the flange on which the rim
is fitted. Springs fare employed preferably four in number placed between the
boss and suitable projections on the side or cover j¹ this side has flanges j*
through which the bolts for securing it together are passed.
The action of this wheel under violent shocks is like that previously described but
the construction is such that the separate toothed rim cc' can be readily removed and
changed say for one with a smaller number of teeth in it thus accomodating the
pitch to a chain which has stretched after wear.
By making the wheels in separate pieces as described they can be placed upon or
removed from any axle or shaft without removing other wheels or taking the shaft
out of its bearings it is obvious however that the boss might be made solid or in one
piece and one side cover might be in one piece for some positions.
My improved chain wheels aro particularly adapted for use in tramcars driven by
dynamos compressed air gas steam or other portable power or they can be employed
as tooth geared wheels without the intervention of a chain.
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. A chain wheel or other toothed wheel so constructed that motion is trans-
mitted from the rim to the boss or vice versa from the boss to the rim by springs
instead of by rigid parts or connections as now customary.
2. The construction combination and arrangement of parts constituting the
improved chain wheel or other toothed wheel substantially as and for the purposes
described and as illustrated by Figures 1 and 2.
3. The construction combination and arrangement of parts constituting the
improved chain wheel or other toothed wheel substantially as and for the purposes
described and as illustrated by Figures 3 and 4.
4. The construction combination and arrangement of parts constituting the
improved chain wheel or other toothed wheel substantially as and for the purposes
described and as illustrated by Figures 5 and 6.
5. The use and application of a separate toothed rim for a chain wheel sub-
stantially as and for the purposes herein described with reference to Figures 5 and 6.
Dated this 30th day of September 1887.
H. B. BARLOW,
17, St. Ann's Square, Manchester,
Agent for Applicant.