Year: 1886

page_text: MOTION.
We, JOSEPH DEAN, JAMES SMITH, and JOHN GRACE, all of the North Valley
Tool Works, Keighley in the County of York, Machine Tool Makers, 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 relates to certain improvements in friction pullies, such as are
used for driving metal planing and other machines in which the direction of the
motion is constantly changing; and has for its object, the construction of the same
in such a manner, that the wedges for applying the friction clips, operate the clip
levers with more freedom, and the necessity for regulating the adjusting screws is
greatly reduced.
The invention is applied to a rotating pulley by forming between the circum-
ference of the pulley and shaft, an annular recess for the reception of a friction
clip, which we secure to a plate keyed on the shaft, and to which are also attached
a pair of levers fitted at one end with adjusting screws, and at the other with anti-
friction rollers, between which a wedge passes for applying the friction clip to the
revolving pulley, by which means the friction on the wedge and the frequency of
adjusting the screws is minimised,
In order that our invention may be better understood, we will describe the same
more in detail by making reference to the accompanying sheet of drawings, in
which Fig. 1 represents a side elevation of a friction pulley constructed according
to our invention, a portion of the plate being cut away to shew the interior more
clearly. Fig. 2 is a front view of a pair of pullies on the same shaft with the
sliding wedge sleeve between them, one of the pullies being a vertical section
through the centre, and Fig. 3 a plan of the sliding. wedge sleeve.
When the friction pullies A and A¹ are applied to metal planing or other
machines in which the motion is constantly being reversed, they are driven by
open and cross belts, so that when the wedge sleeve is in the centre of the two
pullies, the friction clips are free, thereby allowing the two pullies A and A¹ to
revolve freely on the same shaft B but in opposite directions. Each pulley is
prepared with an annular recess C, which is turned true on the circumference of
[Price 6d1

page_text: the inner flange C³, and fitted with a friction clip D placed in the recess and
secured by the screw E to the plate E', which is firmly keyed on the shaft B.
To this plate we mount two levers F on the studs G as fulcrums, and at the end
of each, near the said studs, we place adjusting screws H, and at the opposite end
of the levers we mount the anti-friction rollers K between which the projecting
wedge L works.
The sleeve M slides in a feather key sunk in the shaft B, and is operated by
the standard N which projects between the flanges .thereof and secured to the
reciprocating bar O actuated by the machine in any well known manner. On each
end of the sliding sleeve M, is a projecting wedge L which is parallel or nearly so
for some distance from the flange to which it is attached, and when the sleeve M is
moved in either direction so that the anti friction rollers K mounted to the levers F
are on the parallel portion L¹ of the said wedge as in pulley A, the before named
levers will have been operated to such an extent, that the adjustable screws H at
the opposite end of the same, and in contact with the projecting ends D¹ of the
friction clips D which pass through an opening in the plate E¹ such a distance,
that the screws, by the levers being operated in the manner described, cause the
ends D¹ to be pressed towards each other, thus contracting the diameter of the
friction clip D, so that the latter grips the turned face of the inner flange C¹
sufficiently tight, that the pulley A causes the plate E¹ and shaft B to rotate in the
same direction; the parallel part L' of the other wedge for operating the clip D of
pulley A¹ being withdrawn, the said clip is clear of the inner flange C¹ of the said
pulley therefore allowing the respective plate E to be free of the pulley A¹, which
revolves in the opposite direction to the pulley A and shaft B when driven in the
manner as before described.
On the withdrawal of the parallel portion L¹ of the wedge, the pressure on the
anti-friction rollers K is released and therefore the grip of the friction clip D
removed from the face of the inner flange C, and in order that the clip may release
and clear the said inner flange immediately on pressure being removed from the
rollers K, and also to prevent the said clip moving or coming in contact with the
internal flange C₁ except when operated by the wedge and levers, we insert one or
more compressed springs S in a suitable recess or recesses formed in the ends D¹ of
the clip, by which the latter is caused to expand and leave the pulley free to revolve
independent of the plate E' and shaft B.
Having now particularly described and ascertained the nature of this invention,
and in what manner the same is to be performed, we declare that what we
claim is,
A friction clutch pulley having levers F fitted with anti-friction rollers K and
adjusting screws H, substantially in the manner as shewn and described,
A friction clutch pulley in which the levers are combined with the clip D and
compressed spring or springs S, substantially in the manner and for the purpose
set forth.