Improvements in Roller Bearings for Sheaves of Pulley Blocks, Caster Wheels, and other Wheels or Rotating Parts.
Year: 1893

page_text: Date of Application, 13th June, 1893
Complete Specification Left, 6th Mar., 1894-Accepted, 12th May, 1894
PROVISIONAL SPECIFICATION.
Improvements in Roller Bearings for Sheaves of Pulley Blocks,
Caster Wheels, and other Wheels or Rotating Parts.
A communication by JOHN S. W. THOMPSON, of 16, Beaver Street, in the City,
County, and State of New York, United States of America, Merchant.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster, and 323, High Holborn, in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to the class of rolling bearings such as are employed in
pulley blocks as mountings for the sheaves or pulleys thereof; such a bearing, as
now constructed, comprises an internal circular track in the eye of the sheave, two
sets of overlapping rollers arranged in the eye of the sheave and so as to bear
outwardly on said internal track, pintles on which said rollers rotate, and two rings,
which embrace the rollers and in which the respective ends of said pintles are
fixed. The rollers bear, inwardly, on the fixed cylindrical rod or shaft about
which the sheave turns. In this construction the rollers of one set overlap and
alternate with the rollers of the other set, the two sets being, of course, in different
planes. This employment of sets of overlapping rollers enables rollers of
relatively large diameter to be used. As ordinarily constructed, however, the
faces or sides of adjacent overlapping rollers of the bearing, will rub. or chafe
against each other and cause undue wear and friction, and this wear and friction
is the greater because of the two surfaces in contact moving in opposite, directions
simultaneously as the rollers roll about the shaft of the sheave.
they
To obviate this difficulty and compel the rollers of each set to track as
move about the shaft, is the main purpose of the present invention, and this is
accomplished by providing the pintle of each roller with a boss or sleeve which
confines the roller to one position on the pintle and allows the rollers to rotate
almost in contact, but without actually touching. This compels the rollers of each
set to track and prevents entirely that lateral movement which not only produces
undue friction, but under heavy strains it produces irregular wear and the formation
of burrs on the rollers. To still further guard against wear and friction the
rollers are made of hardened steel, or case-hardened iron and have their angles
slightly chamfered.
Dated this 12th day of June 1893.
i
WM... THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION
5 Improvements in Roller Bearings for Sheaves of Pulley Blocks,
Caster Wheels, and other Wheels or Rotating Parts.
A, communication by JOHN S. W. THOMPSON, of 16, Beaver Street, in the, City,
County, and State of New York, United States of America, Merchant.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool and 6, Bank Street,
Manchester both in the County of Lancaster and 323 High Holborn in the

page_text: County of Middlesex, Civil 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 :-
This invention relates to the class of roller bearings wherein a gang of rollers
is interposed between a stationary journal and the hub or center of a wheel, sheave,
or the like, the rollers rolling at their outer faces on an internal track formed in
the hub or center. Usually two or more sets of rollers arranged abreast, are
employed, the rollers of one set overlapping those of the adjacent set.
The object of the invention is to so mount the rollers of adjacent sets that they
will not chafe or grind against each other, but be compelled to track, and also to
improve the construction so as to stiffen the frame carrying the rollers and thus
enable it to resist twisting strains.
In the accompanying drawings, the preferred construction of the invention is
illustrated:
Figure 1 is.a side view of the central part of a wheel provided with the invention,
parts being broken away to better illustrate the construction; and
Figure 2 is a section through the wheel showing the roller bearing in position.
Figure 3 is a side view of one of the pintle-sections with the rollers in place
thereon.
Figure 4 is a perspective view of one of said sections.
Figure 5 is a side view of the two pintle-sectious of the bearing fitted together
and carrying the rollers. This view shows all of the elements of the bearing
assembled.
Figure 6 is a plan view of the pintle-section, and
Figure 7 is a perspective view of a bearing-roller, detached.
The pintle-section (Figs. 4 and 6) comprises a plate, A, preferably circular
exteriorly and having in it an aperture, a. This plate is of cast metal, and formed
integrally with it are like roller pintles, four as herein shown. These pintles are
spaced at equal distances apart and their axes are all situated at the same distance
from the center of the plate A. Each pintle comprises a broad or thick base
portion, b, a cylindrical journal, b, and a reduced extremity, b. Midway between
the axes of the pintles are holes, 2, in the plate A; these holes are situated at
exactly the same distance from the center of the plate A as the pintles. The
bearing requires two of these pintle-sections, which are fitted together face to face,
.the extremities, b, on the pintles of one section, entering and fitting snugly the
holes 3, in the plate A, of the other section.
Before fitting the sections together, however, the rollers, C, one of which is seen
detached in Fig. 7, are slipped onto the journals, 6, of the respective pintles. To
do this conveniently, four rollers may be slipped on the pintles of one section, as
seen in Fig. 3, and the other four rollers be placed in position between the bases of
the pintles on this section. The other section may then be put in place, when the
assembled parts will appear as in Fig. 5.
It will be noted that the journals 6, are of the same length as the rollers, and
the bases b, of the pintles are a very little longer than the rollers. This prevents
the rollers of one set from chafing or rubbing against those of the other set.
After the parts are assembled as in Fig. 5, the ends of the pintles which project
through the holes 62, in the plates A, are rivetted solidly down upon the said plates
as indicated in Figs. 1 and 2.
When constructed in this manner, the bearing will be perfectly stanch and
capable of resisting strains tending to distortion, as the pintles have their bases as
broad as the spaces required for the rollers will admit, and they are cast integrally
with the plate.
The rollers are preferably made of steel, and the pintle-sections of brass, bronze,
or other metal not oxidizable like iron or steel, as otherwise exposure to dampness
is apt to cause the rollers to rust fast on their journals.
Fig. 2 shows the preferred form of wheel-center to receive the bearing. D
represents a sheave or wheel of wood in which is secured the metal center, made

page_text: in two sections, E, E, meeting in the plane of the wheel at e, where they have
interlocking shoulders formed by turning them in a lathe. A track, e, is formed
in the wheel-center, for the rollers of the bearing to roll on.
This sectional construction of the wheel section permits of finishing the bearing
by rivetting the pintles before placing the bearing in the wheel-center. If the
latter is integrally constructed, it will be necessary to assemble the parts of the
bearing in the wheel-eye and rivet the pintles afterward.
G is the spindle or fixed shaft about which the wheel turns.
The invention is not limited to the integral construction seen best in Figures 3, 4
and 6.. Good results, especially where the sheave is designed for light work, may
be obtained by rivetting the shouldered pintles in the rings A at both ends. In
any case, the pintles should be shouldered so as to prevent the rollers from chafing.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. The improved roller bearing constructed and operating substantially as
described with reference to the accompanying drawings.
2. A roller bearing comprising shouldered pintles fixed in or to embracing rings
or plates, as set forth, and rollers on the said pintles, whereby the overlapping
rollers of adjacent sets are prevented from chafing against each other.
3. A roller bearing comprising rollers C, and two like pintle-sections of cast
metal, each of said sections comprising a plate A, having a central aperture a, and
a series of holes ³, to receive the pintles on the other section, and the pintles
formed integrally with the plate A and having each a broad base portion b, a..
journal 6, for the roller, and a reduced extremity, substantially as set forth.
Dated this 5th day of March 1894.
WM. P. THOMPSON & Co.,
Agents.