Year: 1898

page_text: [Communicated from abroad by FELIX PASCALIS CANFIELD, Machinist, of 50,
Waverley Street, Brighton District, Boston, and CLARENCE WINFIELD
STETSON, Merchant, of Newton Highlands, Newton, Middlesex, County Mas-
sachusetts, both in the United States of America.]
I, JOHN THOMAS KNOWLES, Trade Marks Agent, of the Firm of D. Young &
Co., of 11 and 12, Southampton Buildings, London, W.C., do hereby declare the
nature of this invention to be as follows:-
The present improvements are embodied in a pulley or clutch body having an
annular flange with a smooth internal surface concentric with its shaft, a trans-
versely-severed elastic ring mounted on a carrying plate within said flange and
adapted to be enlarged into frictional contact therewith, in combination with an
eccentric-strap having a radial stem connected to said carrying plate and located
between the ends of the severed ring, and with an eccentric within said strap,
ring and flange and provided with a projecting member to engage the shipper
mechanism, preferably a tubular sleeve surrounding the shaft, made integral with
the eccentric, and spirally grooved to receive the actuating studs on the shipper
sleeve. Other novel features are rigid struts or curved projections formed on the
carrying plate semi-circular covering plates perpendicular to the shaft and
secured by screws entering said struts or projections; a peripheral groove in the
neck of the eccentric-sleeve to receive the edges of said covering-plates; the
severed ring overlapping the periphery of the carrying plate and supported by
studs through the covering and carrying plates; and the sliding shipper sleeve
provided with a peripherally-adjustable spline not entering the shaft.
In carrying the said invention into practice I preferably proceed as follows,
viz. The pulley or clutch body is preferably arranged so as to be capable of
turning freely on the rotary shaft and is formed with an annular flange having
a smooth circular inner surface for engagement when the clutch is operated.
The outer surface of this flange may carry the driving belt, or such flange may
be formed laterally on a larger pulley; or a complete pulley may be fixed upon
the hub and thus actuated by the clutch.
On the rotary shaft is keyed a carrying plate, located within the said flange
and formed with an elongated hub surrounding the shaft to stiffen and support
said plate. Rigid struts or curved projections are cast integral with the carrying
plate to strengthen it and support covering plates which are flat semi-circular
castings secured by screws passing through screw-holes and fixed in the said
rigid projections. Such plates overlap the outer edges of the annular flange and
cover the enclosed parts of the clutch mechanism.

page_text: 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..
The present improvements are embodied in a pulley or clutch-body having an
annular flange with a smooth internal surface concentric with its shaft, and a trans-
versely-severed elastic ring mounted on a carrying-plate within said flange and
adapted to be enlarged into frictional contact therewith, in combination with an
eccentric-strap having a radial stem connected to said carrying-plate and located
between the ends of the severed ring, and with an eccentric within said strap,
ring, and flange, and provided with a projecting member to engage the shipper
mechanism, preferably a tubular sleeve surrounding the shaft made integral with
the eccentric and spirally grooved to receive the actuating-studs on the shipper
sleeve. Other novel features are rigid struts or curved projections formed on the
carrying-plate, semicircular covering-plates perpendicular to the shaft and
secured by screws entering said struts or projections, a peripheral groove in the
neck of the eccentric-sleeve to receive the edges of said governing-plates, the
severed ring overlapping the periphery of the carrying-plate and supported by
studs through the covering and carrying plates, and the sliding shipper-sleeve
provided with a peripherally-adjustable spline not entering the shaft.
In the drawing
Figure 1 is a longitudinal section of the improved clutch.
Figures 2 and 3 are transverse sections on the line 2-3 of Figure 1, showing
a change of position by partial rotation of the eccentric.
Figure 4 comprises side and end views of the adjustable spline.
Figure 5 is an elevation of the eccentric and its grooved sleeve, and
Figure 6 a plan of one of the covering-plates.
A represents the rotary shaft, and B the pulley or clutch-body formed with the
annular flange B₁, having the smooth circular inner surface for engagement when
the clutch is operated. The outer surface of this flange may carry the driving-
belt, or such flange may be formed laterally on a larger pulley, or a complete
pulley may be fixed upon the hub shown as part of the body B and thus actuated
by the clutch.
C is the carrying-plate located within the flange B₁ and formed with an elon-
A
gated hub C, surrounding the shaft A, to stiffen and support said plate.
key secures the hub and plate to the shaft. Rigid struts or curved projec-
tions D, Figures 2 and 3, are cast integral with the plate C to strengthen it and
support the covering-plates E. These plates are flat semicircular castings secured
by screws passing through screw-holes and fixed in the rigid projections D.
Such plates overlap the outer edges of the flange B₁ and cover the inclosed parts
of the clutch mechanism.
F represents the elastic severed ring normally fitting loosely within the
flange and secured to the carrying-plate C by a screw G, passing through the
covering-plate 1 and an elongated slot f in said ring and entering the carrying-
plate C, as in Figure 1. Such ring is severed at a point opposite to the slot f,
and its ends form enlarged shoulders F¹ with parallel surfaces. The inner edge
of this ring overlaps the periphery of the carrying-plate on which it is mounted,
so as to bear upon the entire inner surface of the flange B₁ frictionally.
Between the shoulders F1 of the severed ring is the stem H¹ of the eccentric-
strap H, such stem being anchored to the carrying-plate C by the screw G¹, pass-
ing through the covering-plate E and an elongated slot in said stem and being
fixed firmly in said carrying-plate. The screws G and G¹ therefore secure the
severed ring to said plate, but leave it free to yield outwardly when the
shoulders are separated.
Within the circular strap H is the eccentric J, serving when partially rotated
to swing said strap to one side, thereby vibrating its stem H¹ between the
shoulders of the severed ring and expanding said ring into strong frictional
contact with the flange B¹, as in Figure 3. This produces the clutch action and

page_text: eccentric-strap having a radial stem parallel with and located between the
shoulders where said ring is severed, and an eccentric within said strap having
an integral sleeve-like member projecting between the covering-plates, and
adapted to be oscillated by the shipper mechanism, substantially as set forth.
4. In a friction-clutch, the annularly-flanged clutch-body, the carrying-plate
within such flange formed with a central hub adapted to be keyed to the shaft
and with rigid projecting struts, and semi-circular covering-plates perpendicular
to the shaft secured on said struts to inclose the clutch proper, in combination
with a transversely-severed elastic ring anchored to said carrying-plate and over-
hanging its periphery so as to bear circumferentially against the entire inner
surface of the clutch-flange, an eccentric-strap within said ring and an eccentric
surrounding the shaft and formed with a grooved tubular neck adapted to be
oscillated by the shipper mechanism, substantially as set forth.
5. In a friction-clutch, the annularly-flanged revolving body and the carrying-
plate keyed to the shaft and supporting the expansible clutch apparatus to engage
with said body, in combination with a shipper-sleeve having a sliding movement
on the shaft and grooved longitudinally in its inner wall, and with a circumfer-
entially-adjustable core or spline having a cylindrical bore to fit the shaft, ribs
or prongs to fit within the shipper-sleeve and a set-screw to fix its position when
adjusted, substantially as set forth.
Dated this 22nd dose of Naramban 1000
'
D. YOUNG & Co.,
11 & 12, Southampton Buildings, London, W.C.,
Agents for the Applicant.