Improvements in Split Gear-Wheels, Pulleys, and the like.
Year: 1898

page_text: Date of Application, 4th Jan., 1898—Accepted, 26th Feb., 1898
12
Improvements in Split Gear-Wheels, Pulleys, and the like.
.I, JOSEPH PATRICK MULLIN, of Arlington, in the County of Hudson and State of
New Jersey, one of the United States of America, Mechanical 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 split or sectional gear-wheels, pulleys, etc.,
in which there is a split hub-centre detachable from a split rim; the object being to
provide a hub-centre whereon the sections of the split-rim fit frictionally so that the
rim is prevented rotating on the centre wholly by friction, means being employed,
preferably a dove-tail constructed at the joint, for preventing lateral displacement
of the parts.
In the accompanying drawings, Fig. 1 is a side elevation of the split wheel.
Fig. 2 is a vertical section of the same in the plane indicated by line
in Fig. 1,
Fig. 3 is a side view of the hub-centre, showing the sections thereof slightly
separated. Fig. 4 is a fragmentary section on the line at in Fig. 1, showing the
key f in place.
According to my invention, the hub-centre consists of two sections, y and z,
which, on being fitted together, provide the central boss a, bored to fit on a shaft or
axle, and a web b, integral with said boss. The web is circular, and is formed with
a bevelled margin c, and a dove-tail circumferential groove d, both concentric with
the bore in the boss; the latter being furnished with lugs h for the reception of
bolts e, whereby the two sections y and z are secured together, after they are fitted
on the shaft or axle. The split, or line of division of the hub-centre does not extend
diametrically across the same, but after dividing the boss a, into two equal sections
or halves it passes obliquely through the web b, thus throwing into one of the
sections the angular portion marked y*.
0
The rim of the wheel is annular and consists of two like halves or sections, Y.
and Z each of which is furnished with a web k having a dove-tailed circumferential
groove cx, to receive the beveled margin o of the web b and a bevelled circumferential
inner margin d whereon the groove d of the hub-centre fits. The sections of the
wheel-rim are furnished with lugs to receive the bolts ex whereby the rim sections
are secured to each other, these bolts serving to draw the sections of the rim tightly
on to the web of the hub-sections so that one cannot move on the other by reason
of the excessive friction; the dove-tail joints acting under pressure so that no bolts
are required or employed to secure the sections of the rim to the sections of the
hub. However, as a precaution to prevent the movement of the rim about the
centre in case the bolts which draw together the sections of the rim should become
slack from any cause, a safety key f may be employed to connect the two parts together
in a positive manner. This device is clearly shown in Fig. 4, wherein is the
radially arranged key driven into registering key-ways or sockets g formed in the
adjacent parts.
The herein described split wheel is simple in construction and inexpensive to
manufacture. The edge and groove d may be turned after the sections of the

page_text: hub-centre have been fitted together and bored, and the groove c* and edge d³ may
be turned after the sections of the rim have been fitted together.
It will be observed that the dove-tailed interlocking devices of the rim and hub-
centre fix the part rigidly together when the sections of the rim are fitted on to the
hub-centre and drawn together by means of the bolts ex; the form and construction
of the parts resulting in the inner faces of the webs. resting or pressing against each
other.
Thus the lateral overlap effected by the dove-tail serves to prevent lateral dis-
placement of the parts without the aid of extraneous bolts or screws and also to draw
or wedge the faces of the webs together.
The object in making the line of division of the web b oblique, so as to throw the
excess at y* on one of the sections of the hub-centre, is to divide the periphery of
the hub-centre unequally, while the rim is divided equally; such a construction
avoiding coincidence between the joints of the rib and hub-centre. This feature,
however, is not absolutely essential to the invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I claim :—
1. A split wheel comprising a hub-centre and a rim, both sectional, and respectively.
provided with an interlocking peripheral edge and groove and with integral means
for preventing lateral movement of the one part on the other, means for securing
together the sections of the rim and means for securing together the sections of the
hub-centre.
2. A split wheel comprising a sectional hub-centre having its periphery or edge
bevelled, a sectional rim having a circumferential groove to receive said edge of the
hub-centre when the parts are fitted, whereby lateral displacement of the one part
on the other is prevented, means, independent of the centre, for drawing and securing
the sections of the rim together, and means, independent of the rim, for securing
the sections of the hub-centre together.
3. A split wheel consisting of a hub-centre of circular contour provided with a
bevelled peripheral edge c and a dove-tail groove d, the rim provided with a circum-
ferential groove c* and peripheral edge d³, these latter being adapted to fit and
interlock with the edge cand groove & on the hub-centre, and ineaus for securing
together the sections of the hub-centre, and the sections of the rim.
4. A split wheel comprising an annular sectional rim, and a sectional hub-centre,
said rim and centre having circular interlocking parts and laterally overlapping parts
which prevent lateral displacement, the division of said hub-centre being unequal,
whereby both joints of the hub-centre are overlapped by the same section of the
rim.
5. A split wheel comprising an annular sectional rim and a sectional hub-centre,
said rim and centre having circular interlocking parts and lateral overlapping
portions, and being held against relative displacement, the one on the other, and a
safety key f, engaging registering key-ways in the respective rim and centre
sections.
6. A split wheel comprising a sectional annular 'm and a sectional circular hub-
centre on which the rim fits and is held, one of 3. parts having a circumferential
groove which receives an edge on the other part and overlaps it at both sides to avoid
lateral displacement, means, independent of the rim, which secure the sections of
the centre together, and means, independent of the centre, which draw together the
sections of the rim so that it clamps the centre tightly.
1009
Dated
Ord day
January 1999.
For the Applicant,
G. G. M. HARDINGHAM,
Chartered Patent Agent, 191, Fleet Street, London, E.C.