An Improvement in Toothed Wheels and Driving Pulleys.
Year: 1893

page_text: Date of Application, 3rd Feb., 1893
Complete Specification Left, 27th Oct., 1893-Accepted, 2nd Dec., 1893
PROVISIONAL SPECIFICATION.
An Improvement in Toothed Wheels and Driving Pulleys.
I, LUXE BILLING, of 14 Llantrissant Street, Cardiff, Engineer; do hereby
declare the nature of this invention to be as follows:-
This invention relates to toothed wheels and pulleys, and consists in making the
rims thereof separate from the bodies and so attaching them to the bodies that
when an undue strain is exerted the bodies rotate within the rims which then cense
to rotate.
The body of a toothed wheel or pulley is, under this invention, shaped to present
at. one side a rib extending around it. The rim (with the teeth, in the case of a
toothed wheel, or plain in the case of a pulley) is made with a bevelled tongue, one
side of which bears against the rib aforesaid. A movable face-plate is brought to
bear against the opposite side of the bevelled tongue of the rim and is screwed up
by bolts and outs to bind the rim to any desired degree of tightness. The rim and
body are thus bound together and rotate together, but if, in working, a strain be
exerted above that which the rim is, by screwing up the face-plate, adjusted to
take, the body rotates within the rim which then ceases to revolve.
By the use of toothed wheels and pulleys constructed in accordance with this
invention, risk of breakage arising from shocks duo to sudden or severe strains is
reduced. The friction blocks ordinarily employed for this purpose are, under this
invention, superseded.
Dated this 2nd day of February 1893.
NICHOLAS WATTS,
Chartered Patent Agent.
COMPLETE SPECIFICATION.
An Improvement in Toothed Wheels and Driving Pulleys.
I, LUKE BILLING, of 14, Llantrissant Street, Cardiff, Engineer, do hereby
declare the nature of this invention and in what manuer the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to toothed wheels and pulleys and consists in the provision
therein of separately made rims so attached that on an undue strain being exerted
on the rims these latter rotate about the bodies, where the wheels and pulloys aro
driven, and, when the wheels and pulleys are employed to drive, the bodies rotate
within the rims.
The body of a toothed wheel or pulley is, under this invention, shaped to prosent
at one side a rib extending around it. The rim (with the teeth, in the case of a
toothed wheel, or plain in the case of a pulley) is made with a bevelled tongue, one
sido of which bears against the rib aforesaid. A movable face-plate is brought to
bear against the opposite side of the bevelled tongue of the rim and is screwed up
by bolts and nuts to bind the rim to any desired degree of tightness. The rim and
body are thus bound together and rotate together as one, but if, in working, a strain
be exerted above that which the rim is, by screwing up the face plate, adjusted to
take, the rim, where the wheel is a driven wheel, elips about the body. In the case
of a driving wheel or pulley the body slips within the rim.
In the accompanying sheets of drawings
Fig. 1 represents, in section, a toothed wheel devised in accordance with this

page_text: The body a is shaped to present at one side a rib a' extending around it. The
rim 6 is made with a bevelled tongue e one side of which bears against the rib a.
A movable face-plate d is placed against the other side of the tonguo e and screwed
up by bolts & to bind the rim to any desired degree of tightness. The rim and body
being thus bound together rotate as one so long as a strain in excess of that to
which the rim is, by screwing up the face plate d, adjusted to resist, is not exerted
on the rim. When such a strain is exerted the rim moves about the body a, that is
if tho wheel be in use as a driven wheel. If, however, it be employed as a driving
wheel the body moves within the rim. In either case, fracture of the teeth or
other injury otherwise liable to occur from the cause stated is avoided.
Another example of a toothed wheel fitted to act as above described is shown at
Fig. 3 from which it will be seen that a rim of any size can be applied to a body or
hub by judiciously lightening the rim casting with aportures as shown.
At Fig. 4 is represented a pulley constructed and fitted in the same mauber as
the toothed wheel above described.
When a strain is exerted through the belt on the pulley in excess of that to take
which the face plate d is screwed up, in the case of a driven pulley the rim 6
carrying with it the arms is moved round the body or hub, or in the case of a
driving pulley the hub or body revolves in the rim 6; thus avoiding displacement
of the belt or destruction of or injury to the machinery being driven.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
In a toothed wheel or pulley, the provision of a rim made separately from the
body and fitted to be clamped thereon to any desired degree of tightness by a plate
such as band bolts e, the parts being shaped, constructed and arranged, substantially
as hereinbefore described with reference to the accompanying drawings and for the
purpose specified.
Dated this 24th dar of October 1898.