IMPROVEMENTS IN COMPOUND FIELD ROLLERS
Year: 1881

page_text: LETTERS PATENT to Robert Maynard, junior, of Whittlesford, near Cambridge,
for an Invention of "IMPROVEMENTS IN COMPOUND FIELD ROLLERS."
PROVISIONAL SPECIFICATION left by the said Robert Maynard, junior,
at the Office of the Commissioners of Patents on the 30th March 1881.
ROBERT MAYNARD, junior, of Whittlesford, near Cambridge. "IMPROVEMENTS
IN COMPOUND FIELD ROLLERS."
This Invention relates to improvements in compound field rollers, that is to say,
field rollers which are composed of a series of rings mounted on a spindle or axis,
thus forming a cylindrical roller, in which each ring acts independently of the
others. Such rollers are ordinarily made with rings having their bosses the same
length as the main part of the ring through which the spindle is passed, and on
which they are free to revolve, but the bosses being necessarily short soon wear
and permit the rings to fall sidewise and tilt out of the perpendicular.
Now the object of my Invention is to preserve the perpendicularity of the rings
in relation to the centre spindle or bar whereon they revolve, and by so doing
preventing their tilting or falling sidewise, thus ensuring eveness of wear and
increased durability. This I effect by making the boss of every second or alternate
ring double the length of the thickness of the ring, and of such dimensions as to
allow each of such rings to revolve freely on the spindle when placed therein. I
then construct another set of rings with enlarged bosses, which bosses have boles
sufficiently large to allow of their passing over and revolving freely upon the
elongated projecting bosses of the first mentioned set of rings, so that when the
rings are mounted upon the spindle in alternate succession the large boss of one
ring embraces nearly the half of the two smaller elongated projecting bosses of the
other rings placed one on either side thereof. By this improved construction and
arrangement the length of the smaller bosses is doubled, there being no room
whatever lost between them, as their ends when placed together are flush with each
other, and thus form as it were a second continuous axis or spindle whereon the

page_text: rings furnished with the enlarged bosses revolve. Moreover, the length of such
larger bosses is also nearly doubled, as only so much room is left between them as
is occupied by the spokes of the smaller ones, against which spokes the larger bosses
butt on each side, and are thus securely held in an upright position without in the
slightest degree impeding the freedom of their revolution.
10
It will be obvious that by this improved construction and arrangement of the
rings of field rollers I entirely obviate the disadvantages before mentioned, at the
same time that increased durability is imparted to the roller.
In some cases I unite two or more rings to one boss, thus increasing the length
of the boss and obtaining a longer wearing surface.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Robert Maynard, junior, in the Great Seal Patent Office on the
12th September 1881.
ROBERT MAYNARD, junior, of Whittlesford, near Cambridge.
IN COMPOUND FIELD ROLLERS."
.
"IMPROVEMENTS
This Invention relates to improvements in compound field rollers, that is to say,
field rollers which are composed of a series of rings mounted on a spindle or axis,
thus forming a cylindrical roller in which each ring acts independently of the others.
Such rollers are ordinarily made with rings having their bosses the same length as
the main part of the ring through which the spindle is passed and on which they
are free to revolve, but the bosses being necessarily short soon wear and permit the
rings to fall sidewise and tilt out of the perpendicular.
Now the object of my Invention is to preserve the perpendicularity of the rings
in relation to the centre spindle or bar whereon they revolve, and by so doing
preventing their tilting or falling sidewise, thus ensuring a more efficient working
of the roller combined with eveness of wear and increased durability. This I effect
by making the boss of every second or alternate ring double the length of the
thickness of the ring and of such dimensions as to allow each of such second or
alternate rings to revolve freely on the spindle when placed thereon. I then
construct another set of rings with enlarged bosses, the holes in such bosses being
sufficiently large to allow of their passing over and revolving freely upon the elongated
projecting bosses of the first mentioned set of rings, so that when the rings are
mounted upon the spindle in alternate succession the large boss of one ring
embraces nearly the half of the two smaller elongated projecting bosses of the other
rings placed one on either side thereof. By this improved construction and arrange-
ment the length of the smaller bosses is doubled, there being no room whatever
lost between them, as their ends when placed together are flush with each other,
and thus form as it were a second continuous axis or spindle whereon the rings
furnished with the enlarged bosses revolve. Moreover, the length of such larger
bosses is also nearly doubled, as only so much room is left between them as is
occupied by the spokes of the smaller ones, against which spokes the larger bosses
butt on each side, and are thus securely held in an upright position without in the
slightest degree impeding the freedom of their revolution. It will be obvious that
by this improved construction and arrangement of the rings of field rollers I
entirely obviate the disadvantages before mentioned, at the same time that increased
durability is imparted to the roller.
In some cases I cast two or more rings together, thus increasing the length of the
boss and obtaining a longer wearing surface. This I more particularly prefer to do
in the case of the outside rings, which are placed one at each end of the main
spindle, as I thus prevent all waste of room between the roller frame and such
outside rings as would otherwise be the case were such outside rings cast with
elongated projecting bosses as above described, as such projecting bosses would not
only prevent the roller frame setting close to the outside rings, but would
unnecessarily increase the length of such frame, which is objectionable on account
of gateways, whereas by casting two or more rings together to form such outside
rollers I am able to get a narrower roller frame and yet a wide roller, which is a
considerable advantage. I wish it however to be clearly understood that I do not
limit myself to casting two or more rings together to form the outside rollers
only, as I may if desirable form the intermediate rollers in a similar manner.
Figure 1 of the accompanying Drawings shews a view in end elevation of one of the
rings of my improved field roller formed with an elongated projecting boss. Figure 2

page_text: shews a view in side elevation of one of the adjoining rings formed with an enlarged
boss to allow of its easily fitting over the projecting boss of the other ring. Figure 4
shews a view in longitudinal section, omitting the roller frame, of my improved
compound field roller having the rings constructed and arranged according to my
improved principle; and Figure 3 shews two rings cast on a single boss in the
manner hereinbefore described.
Having thus particularly described and ascertained the nature of my said
Invention, and the manner of carrying the same into effect, I would have it
understood that what I claim and desire to secure by the hereinbefore in part
recited Letters Patent is,-
1°. The improved construction of compound field roller consisting of a series of
alternate rings formed with elongated projecting bosses which carry the adjoining
rings one on each side, in the manner and for the purposes herein before described
and illustrated.
2°. The casting two or more rings on a single boss in the manner and for the
purposes herein before described and illustrated.
In witness whereof, I, the said Robert Maynard, junior, have hereunto set my
hand and seal, this Ninth day of September, in the year of our Lord One
thousand eight hundred and eighty one.
ROBERT MAYNARD, JUNIOR. (L.S.)