Improvements in and connected with Expanding Pulleys.
Year: 1893

page_text: Date of Application, 11th Feb., 1893
Complete Specification Left, 9th Dec., 1893-Accepted, 13th Jan., 1894
PROVISIONAL SPECIFICATION.
Improvements in and connected with Expanding Pulleys.
We, JOHN WALKER, of The Know Printing Co. Ltd., of Entwistle, near Bolton,
Manager, and JOSEPH STRANG, of Princess Foundry, Ramsbottom, Engineer, both
in the County of Lancaster, do hereby declare the nature of this invention to be as
follows:-
Our invention has for its object the construction of a pulley and means which
will permit of a ready, quick and positive changing of its diameter whilst in motion.
as may be required at any desired speed.
To this end we form a boss with three or more radial arms, each of which is
adapted to receive a shank having at its outer end a pulley segment.
Between the boss of the pulley and each of the inner ends of the shanks of the
segments is arranged to be slid to and fro, parallel with the axis of the pulley, a
wedge adapted to engage the said boss as well as the inner end of the shank of the
segment. For this purpose we form the inner and outer sides of the said wedges.
with a double L groove or recess so as to receive the inner end of the shank and
the pulley boss, which are correspondingly shaped.
On the pulley shaft we arrange to slide and rotate therewith a grooved collar to
which by means of links the thicker ends of the aforesaid wedges are connected. A
fork or double lever which engages the said collar is suitably pivotted and carries
a swivel nut which receives one end of a screw, the other end being suitably
mounted in a bearing and furnished with a hand-wheel or handle. The said screw
turned in one direction pushes by means of the said fork or double lever, collar and
links, the wedges connected thereto inwards and thus expands the segments of the
pulley, whilst when turning the screw in a reverse sense the said wedges move back
and thus contract the segments.
The described arrangement with slight modifications may be used in place of
cones for varying speeds.
1000
F. BOSSHARDT & Co.,
Agents to Applicants.
COMPLETE SPECIFICATION.
Improvements in and connected with Expanding Pulleys...
We, JOHN WALKER, of The Know Printing Co. Ltd., of Entwistle, near Bolton,
Manager, and JOSEPH STRANG, of Princess Foundry, Ramsbottom, Engineer, both
in the County of Lancaster, 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 :-
Our invention has for its object the construction of a pulley and means which will
permit of a ready, quick and positive changing of its diameter whilst in motion as
may be required at any desired speed.
And in order that our invention may be more fully understood we have caused to.
be appended hereunto one sheet of drawings marked with letters of reference
indicating like parts in the various figures.
Fig. 1 is an end view and Fig. 2 a side view partly in section of our improved.
expanding pulley.

page_text: Figs. 3 & 4, are a cross and a longitudinal section respectively of a modification
of the means for adjusting the pulley sections.
In carrying out our invention and referring to the figures generally we form a boss a
with three or more radial arms b, each of which is adapted to receive a shank c
having at its outer end a pulley segment d. Between the pulley boss a and each of
the inner ends of the shanks c is arranged to be slid to and fro, parallel with the
axis of the pulley, a wedge e, adapted to engage the boss a as well as the inner end
of the shank c. For this purpose we form the inner and outer sides of the wedges e
with a double L or a T groove or recess of so as to receive the inner end of the
shank c and the pulley boss a, which are correspondingly shaped or furnished with
plates c¹, a', respectively to engage in a portion of the groove or recess f.
The shanks care each formed with a groove c² adapted to receive the end of a
screw employed in the arm 6 which screw prevents the shank c from rotating and
when screwed tight locks the same and the segment d in position so as to permit
the expanding pulley of being used as an ordinary pulley after uncoupling the
wedge e from the motions by which they are adjusted as hereinafter described.
On the pulley shaft g we arrange to slide and rotate therewith a grooved collar h
to which, by means of links i the thicker ends of the wedges e are connected. A
fork or double lever k which engages the collar his pivotted to a pedestal 7 or
other suitable part and carries a swivel nut m which receives one end of a screw n,
the other end being suitably mounted in a bearing o and furnished with a hand-
wheel por handle. The screw n if turned in one direction pushes by means of the
fork or double lever k, collar h and links i, the wedges e connected thereto inwards
and thus expands the pulley segments d, whilst when turning the screw n in a
reverse sense the wedges e are withdrawn to a certain extent and thus contract the
segments d.
In lieu of forming double L or T grooves or recesses in the wedges.e the same
may be in shape a double ✓ as shown in Figs. 3 & 4 the inner ends of the shanks c
and the boss a being formed accordingly.
The described arrangement with slight modifications may be used in place of
cones for varying speeds as will be readily understood.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim, is-
1st. In expanding pulleys, the general construction and combination of parts
constituting our improvements operating substantially as and for the purpose set
forth.
2nd. An expanding pulley consisting of a number or arms & branching radially
from a boss a, each of which arms receives a shank c having a pulley segment d
rendered radially adjustable in the arm by means of a wedge e which engages
the boss a and the end of the shank c, the said wedges being adjusted simultaneously,
substantially as and for the purpose set forth.
3rd. An expanding pulley as specified in the preceding claim, in combination
with means for mechanically adjusting the wedges e consisting of a collar / linked
to the wedges e and rendered longitudinally movable upon the pulley shaft g by
means of a lever k suitably fulcrumed and engaging the collar h and a screw n
suitably mounted and engaging a swivel nut m carried by the lever k, substantially
as and for the purpose set forth.
Dated this 8th day of December 1893
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicants.