Year: 1887

page_text: Date of Application, 10th May, 1887
Complete Left, 10th Feb., 1888
Complete Accepted, 23rd Mar., 1888
EDWARD SHAW Canons Marsh, Bristol Engineer-do hereby declare the nature of
this invention to be as follows:-
This invention consists of the use of a special form of friction clutch in combination
with a barrel or drum for winding purposes as hereinafter described.
a
The general arrangement is as follows, a suitable framing is provided with bearings
for carrying a shaft; free to revolve on this shaft and near one side of the frame is
the driving pulley, to which is attached a portion (a) of the driving clutch; on the
same shaft & next this part "a" is the winding barrel. The end of the barrel nearest
to the driving pulley has a large flange, projecting from which and overhanging "a"
is a rim, this rim is turned on the inside and outside, the outside surface constituting
one part of the brake clutch, the inside surface one part of the driving clutch. The
part "a "cf the driving clutch consists of a casting on which are formed sliding
surfaces, on these surfaces slide blocks which are carried round the shaft with
when the driving pulley revolves. The outer surfaces of these blocks nearly touch the
inside of the rim before mentioned. The sliding surfaces are inclined to the axis of
the shaft in such a manner that a movement of the barrel towards the driving pulley
forces the blocks up the planes and causes the outer surfaces to bind against the rim,
thus connecting the driving pulley & the barrel. On the outside of the rim before
mentioned, but not fixed to it, are two or more sliding blocks which are attached to
and move on inclined planes; these other inclined planes are rigidly attached to the
framing and are inclined in such a direction that when the barrel moves away from
the driving pulley, and the inside clutch is released, the outer blocks are dragged by
the rim up the inclined planes and are thus forced inwards gripping the outside of the
rim and thus stopping its motion and acting as a brake. It is obvious that if the
winding barrel be attached to the shaft, the shaft can be moved axially in one direction
to engage with the driving pulley, and in the other to be locked to the framing. The
motion for putting on the brake may be obtained by means of a spring or weight,
whilst the motion for driving is obtained by hand through suitable arrangements,

page_text: Instead of the above arrangement for the brake clutch, a similar arrangement to
that for driving may be put at the other end of the barrel, the part "a" in this case
being attached to the framing; or to each end of the barrel may be attached parts
such as "a," whilst the rim portion may, in the driving case be attached to the pulley,
and in the other (the brako) to the framing.
For the purpose of increasing the power of this combination a pinion may take the
place of the barrel and drive spur wheel and barrel or drum on another shaft.
Dated this Ninth day of May 1887.
Improvements in Hoisting, Lifting, or Winding Machinery.
EDWARD SHAW Canons Marsh, Bristol 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 consists of the use of a special form of friction clutch in combination
with a barrel or drum for winding purposes as hereinafter described.
The general arrangement is as follows, a suitable framing is provided with bearings
for carrying a shaft, free to revolve on this shaft and near one side of the frame is the
driving pulley, to which is attached a portion (a) of the driving clutch; on the same
shaft and next this part (a) is the winding barrel. The end of the barrel nearest to
the driving pulley has a large flange, projecting from which and overhanging (a) is a
rim, this rim is turned on the inside and outside, the outside surface constituting one
part of the brake clutch, the inside surface one part of the driving clutch.
The part (a) of the driving clutch consists of a casting on which are formed sliding
surfaces; on these surfaces slide blocks which are carried round the shaft with (a)
when the driving pulley revolves. The outer surfaces of these blocks nearly touch the
inside of the rim before mentioned:
The sliding surfaces are inclined to the axis of the shaft in such a manner that a
movement of the barrel towards the driving pulley forces the blocks up the planes and
causes the outer surfaces to bind against the rim, thus connecting the driving pulley
and the barrel.
On the outside of the rim before mentioned but not fixed to it are one or more
sliding blocks, which are attached to and more on inclined planes, these other inclined
planes are rigidly attached to the framing. and are inclined in such a direction that

page_text: when the barrel moves away from the driving pulley, and the inside clutch is released,
the outer blocks are dragged by the rim up the inclined planes and are thus forced
inwards gripping the outside of the rim and thus stopping its motion and acting as a
brake. It is obvious that if the winding barrel be attached to the shaft, the shaft can
be moved axially in one direction to engage with the driving pulley and in the other
to be locked to the framing. The motion for putting on the brake may be obtained
by means of a spring or weight, whilst the motion for driving is obtained by hand
through suitable arrangements.
Instead of the above arrangement for the brake clutch a similar arrangement to that
for driving may be put at the other end of the barrel, the part (a) in this case being
attached to the framing; or to each end of the barrel may be attached parts such as
(a), whilst the rim portion may in the driving case be attached to the pulley, and in
the other (the brake) to the framing. Instead of the barrel I may use a chain or
grooved wheel.
.
For the purpose of increasing the power of this combination a pinion may take
the place of the barrel and drive a spur wheel and barrel or drum on another shaft.
In order that the invention may be more particularly understood, I now describe
the accompanying drawings.
Figs. 1 & 2 (Sheet 1) are respectively side and end elevations of a hoist, the upper
portions of both being in section, the section in Fig. 2 being taken through CD in
Fig. 1. A is the framing with bearings bb carrying the shaft B; free to revolve on
this shaft is the pulley E, this pulley or its equivalent is actuated by an engine or from
shafting as convenient. Attached to E is the interior portion of the driving clutch
previously called (a), and marked a on the drawings. F is the winding barrel with
the flange c carrying the projecting rim d, previously mentioned, this barrel is fixed
to the shaft B. The part of driving clutch (a) is a casting (attached to pulley E)
with inclined sliding planes e e carrying the blocks or slides ff which may have
wood facing pieces shaped so as to nearly fit the interior of the rim d, this rim is
turned both outside and inside. On the underside of the blocks fare lugs z 2,
these lugs are between 2 rollers carried on a frame i. This frame i is free to
rotate in a groove on the boss of the barrel, with the blocks ff, but not to move
axially unless the barrel with shaft attached is so moved. The frame A carries
blocks g g with inclined surfaces and on these surfaces slide the brake blocks k k.
Two flanges on the rim d serve to control the motion of these brake blocks axially.
Inside the shaft B is a spring m which presses (through a block ) against the framing
at one end and at the other against the shaft, causing the shaft and barrel to move
axially to the right hand (Fig. 1.) carrying the clocks k k up the inclined planes and
thus gripping the outer surface of d to the frame of the hoist. This constitutes the
brake arrangement.
At the other end of the shaft is a lever O with fulcrum at 7, when the end p is
moved by means of a rope or otherwise towards the hoist the rod 1 forces the shaft
axially and releases the brake. The barrel is now free and a tangential force applied
to it, such as is due to the load, will cause it to overhaul and rotate freely. A further
movement of the lever O will by the medium of the frame i cause the blocks ff to
move up the inclined planes e e and thus grip the barrel to the pulley E. A ring r or
other suitable device is used to prevent any axial motion of the pulley E.
Fig. 3. (Sheet 2) is an arrangement for double driving so that in addition to
driving the barrel one way, releasing it and putting on the brake, I may drive it in
the reverse direction by means of an additional pulley or its equivalent. In the
drawing (Fig. 3) the arrangement on the left hand may be exactly similar in all
respects to that in Figs. 1 & 2; the barrel may be longer and has at its right hand end
a flange or rim d', the inside of which is similar to the first described driving rim d.
The pulley W and clutch blocks etc. are also similar except that whilst the pulley E
is kept from moving axially by means of a ring, Figs. 1 & 3, the pulley W is moved
axially by means of a ring S S sunk into a recess in the boss of the pulley and
attached by rods t to the second lever u.
The action of this hoist is the same as before described as far as the first drive,

page_text: overhaul and brake are concerned. For the second drive the lover u is moved
towards the hoist moving S S axially and thus the pulley W; this brings the clutch
attached to W into gear and the pressure thus exerted also moves the barrel axially
and frees the brake. The resistance of the spring (m Fig. 1) being sufficient to give
the grip necessary to drive. The lever u is prevented by a stop from moving so far
as to put both pulleys and clutches in gear at once.
It will be noticed that for convenience the bearing on the right hand end of frame
projects outwards from the frame instead of inwards as in Fig. 1. In this case I may
also vary the arrangements and use gearing to increase the power in a manner
similar to the method adopted in Fig. 4.
Fig. 4. (Sheet 3) shews one method of using gearing for obtaining increased power.
In this case there are two shafts, the first (B) carrying the driving pulley, clutch-
rim etc. and a pinion, which latter drives the second shaft by means of a spur wheel.
On this shaft (or if desired a third shaft may be used) is fixed the barrel. The clutch
rim d which is attached to B is coupled to the pulley E or the frame A as before
described, except in this case I shew another method of actuating the clutch blocks fƒ,
which are moved axially by internal flanges on d; also one brake block k is used
instead of two.
Fig. 5. (Sheet 3) shews how a geared wheel H may take the place of the pulley E
in the previous figures, and a stop ✗ may be used instead of the ring to prevent
its axial motion. It also shows how the clutch arrangements may be reversed so that
the clutch and brake blocks are carried by the barrel instead of the driving pulley and
frame. The clutch rim d in this case is attached to the spur wheel and the brake
rim du being attached to the framing A. The method of working is the same as
before described.
Similar parts in each figure are marked with the same letters.
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 :
1. The general arrangement and combination of hoisting machinery as set forth in
this specification and shewn in Figs. 1 to 5.
2. The axial motion of the driving shaft for the purposes set forth and in the
manner described.
3. The combined use of sliding blocks on inclined planes for obtaining a driving
motion and a brake as described and substantially as set forth.
4. The particular use of a second driving pulley or its equivalent, with clutch
attached, in combination with the first driving clutch and brake substantially as
described, and shewn in Fig. 3.
Dated this Ninth day of February 1888.