An Improvement in Roller Drive-chains.
Year: 1897

page_text: Date of Application, 12th Oct., 1897-Accepted, 13th Nov.,
1897
COMPLETE SPECIFICATION.
An Improvement in Roller Drive-chains.
We,
SIGMUND GUITERMAN and ALBERT LAZARUS GUITERMAN of 35 and 36 Alderman-
bury of the City of London, and trading as S. Guiterman and Company, do hereby
declare the nature of this invention, as communicated to us by The Thames Chain
and Stamping Company in Norwich, Connecticut, in the United States of America,
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
Our invention relates to an improvement in roller drive-chains, one object being to
construct a chain which will drive with a minimum amount of friction and in
which the parts are so assembled that they cannot bind or cramp and will there-
fore be very durable.
A further object is to construct the inner link of the chain of one piece and
mount the antifriction-rollers therein, the said inner link being substantially of
double-yoke form.
A further object is to so construct the chain that the inner links will be short
ones and the outer links the long ones, so that the teeth of the sprocket-wheel
will enter the space between the adjacent ends of two inner links, the antifriction-
rollers being projected into the said space, so that the teeth upon the sprocket-
wheel are caused to engage the said rollers and not the ends of the inner links.
A practical embodiment of our invention is représented in the accompanying
drawings, in which :-
Figure 1 is a view in side elevation of our improved drive chain, showing the
same engaged by two sprocket-wheels.
Figure 2 is a top plan view, on an enlarged scale, of two inner links and their
connecting outer link.
Figure 3 is a side view of the same.
Figure 4 is a top plan view of the inner link and the antifriction-rollers carried
thereby.
Figure 5 is a longitudinal vertical section through the inner link on the
line 5-5 of Figure 4.
Figure 6 is a transverse section through the inner link on the line 6-6 of
Figure 5.
Figure 7 is a transverse section through the inner link on the line 7-7 of
Figure 4
and
Figure S is a top plan view of one of the outer connecting-links, to which the
journal-pins are rigidly secured.
The inner links as a whole are denoted by A and are of double-yoke form,
their opposite sides a a¹, between which the antifriction-rollers are mounted, being.
spaced rigidly apart by a centrally located cross-brace a². The sides and cross-
brace are preferably formed in one piece, and, for the sake of lightness, may be
milled out as shown at a³ a a. When so milled out, the cross-brace assumes the
form of cross-bars spaced apart, as shown in Figure 5. These inner links A are
connected by outer links B, which links consist of side plates. These side
plates are rigidly spaced apart by the journal-pins C, which extend through the
inner links A. These journal pins are provided with shoulders slightly beyond
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page_text: the exterior of the sides a a', so that when the side plates of the outer links are
secured against said abutments on the pins, preferably by upsetting the ends of
the pins, the inner links are free to swing easily on the said pins.
The antifriction-rollers, which, in the present form of our invention, form bear.
ings for the teeth of the sprocket-wheel are denoted by D, and they are loosely
Theso
mounted on the journal-pins C, between the sides of the inner links A.
rollers are of such size that they extend beyond the ends of the sides of the inner
links into the space between the side plates of the outer links, so that the teeth
upon the sprocket-wheels bear upon the said rollers, but do not touch the ends
of the inner links, By this construction the rollers may be made very narrow,
and consequently the journal-pins C may be made much shorter, thereby obviating
any liability on the part of the said pins to bend or break.
By causing the teeth to enter the outer link, rather than the inner link, we
are enabled to make the chain much narrower, without reducing the thickness
of the teeth, as the sides of the outer link will guide the sprocket-teeth to the
centre of the link and cause them to engage only the roller-surface
By spacing the sides of the inner link rigidly apart by the cross-brace a³, and
by securing the sides of the outer link rigidly to the journal-pins C, it will be
seen that the several links of the chain are absolutely rigid, and there is no
tendency on the part of either side of the chain to draw and thereby skew the
rollers.
It is evident that slight changes might be resorted to in the form and arrange-
ment of the several parts herein described without departing from the spirit and
scope of our invention. Hence we do not wish to limit ourselves strictly to the
structure herein set forth.
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. A chain, comprising a series of connected links each alternate link being
formed of sides rigidly spaced apart by a centrally located cross-bruce and rollers
carried by the said alternate links in their opposite ends, substantially as set forth.
2. A chain comprising a series of inner links and a series of outer links, the
sides of the inner links being spaced apart by centrally located cross-braces,
journal pins passing through the ends of the inner and outer links for connecting
them and antifriction-rollers mounted on the said journal-pins between the sides
of the inner links, substantially as set forth.
3. A chain, comprising a series of inner links and a series of outer links, the
sides of the inner links being spaced apart by centrally located cross-braces,
journal-pins passing through the ends of the inner and outer links and secured
rigidly to the outer links and antifriction rollers mounted on the said journal-
pins between the sides of the inner links, the said rollers projecting into the
spaces in the outer links, substantially as set forth.
4. A chain comprising a series of connected links each alternate link being
formed of sides rigidly spaced apart by a centrally located cross-brace, journal-
pins passing through the ends of consecutive links and secured rigidly to the outer
links and bearings on the journal-pins intermediate of the unds of the links pro-
vided with the centrally located cross-bances, said bearings projecting into the
spaces in the adjacent links, substantially as set forth.
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PHILLIPS & LEIGH,
No. 22 Southampton Buildings. Chancery Lane, London, W.C.,
Agents for the Applicants.