Improvements in Hoisting and similar Machinery.
Year: 1895

page_text: Date of Application, 5th Mar. 1896
Complete Specification Left, 4th Dec., 1895-Accepted, 4th Jan., 1896
·PROVISIONAL SPECIFICATION.
Improvements in Hoisting and similar Machinery.
ARTHUR MARSHALL HUNT 178 Stapleton Road Bristol Engineer do hereby
declare the nature of this invention to be as follows:-
This invention relatos to improvements in the. method of constructing the
hoisting, lifting or winding machinery made as described in the Pateut of Edward
Shaw No. 6814 of 1887.
The improvements are:-In the construction and method of moving the sliding
or clutch blocks (forming part of the special form of friction clutch used) so as to
cause them to engage or disengage with the other portions of the clutch; also in
the arrangement and form and manner of fixing the cylindrical portion of the
clutches to enable the frictional or clutch surfacos to be readily and casily
examined; combined with these is a special form of framing which gives lightness
and rigidity with simplicity and ease of fixing the machine.
These improvements are attained by omitting the flanges (which hold the clutch
blocks axially) on the cylindrical or "rim" portion of the clutch and instead
putting a flange or projection on each sliding or clutch block. The "rim" portion
here mentioned is hereinafter denoted by the letter ".”
This rim portion of the clutch "d" is made in a separate piece, and is attached.
by bolts, in the case of the driving clutch to the pulloy or wheel, and in the case of
the brake clutch to the framing.
A groove is formed between "d" and the pulley or framing in which fit the
flanges on the sliding or clutch blocks, this keeps them from moving axially, but:
allows radial movement whilst the interior portion of clutch is moved axially in
engaging or dis-engaging.
The cylindrical portions "d" being made separately and of suitable diameter
can upon removal of bolts be passed over adjacent portions of the inachine, sO
allowing free inspection of the clutch surfaces.
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The framing is formed of channel section (stiffened with ribs) in four pieces, two
of which carry the bearings, formed between the sides of the channel section, whilst
the other two are bolted between them as distance pieces, the whole forming a
rectangular frame. The arrangement is such that both the lifting of driving and
brake clutches are, similarly made with separate portions "d" which take all the
radial bursting stress, so. leaving the frame to carry only the outside stresses and
those due to the end or axial motion.
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A. MARSHALL HUNT,
COMPLETE SPECIFICATION.
Improvements in Hoisting and similar Machinery.
ARTHUR MARSHALL HUNT 178 Stapleton Road, 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 relates to improvements in the method of constructing the

page_text: :
hoisting, lifting or winding machinery made as described in the latent of awara
Shaw No. 6814 of 1887.
The improvements are in the construction and method of moving the sliding or
clutch blocks (forming part of the special form of friction clutch used), so as to
cause them to engage or disengage with the other portions of the clutches; also in
the arrangement, and form, and manner of fixing of the cylindrical portion of the
clutches, so as to enable the frictional or clutch surfaces to be readily and easily
examined.
Combined with these is a special form of framing which gives lightness and
rigidity, with simplicity, and ease of fixing the machine.
These improvements are attained by omitting the flanges (which hold the clutch
blocks axially) on the cylindrical or "rim" portion of the clutch, and instead putting
& flange or projection on each sliding or clutch block. The rim portion here
mentioned is hereinafter denoted by the letter "d.”
This rim portion of clutch "d" is made in a separate piece and is attached by
bolts, in the case of the driving clutch to the pulley or wheel, and in the case of
the brake clutch to the framing.
A groove is formed between "d" and the pulley or framing, in which fit the
flanges on the sliding or clutch blocks; this keeps them from moving axially, but
allows radial movement, whilst the interior portion of clutch is moved axially, in
engaging or disengaging. The cylindrical portions "d" being made separately and
of suitable diameter, can upon removal of bolts be passed over adjacent portions of
the machine, so allowing free inspection of the clutch surfaces. The framing is
formed of channel section, stiffened with ribs, in four pieces; two of which carry
the bearings, formed between the sides of channel section, whilst the other two are
bolted between them as distance pieces; the whole forming a rectangular frame.
The arrangement is such that both the lifting or driving and brake clutches are
similarly made with separate portious "d" which take all outward or bursting
stresses; so leaving the frame to carry only the outside stresses, and those due to
the end or axial motion.
In order that the invention may be more particularly understood I now describe
the accompanying drawing.
Fig. I is a side elevation of a hoist, the upper half being in section. Fig. II is
a section through the line y in Fig. 1,
The framing is formed of four parts, A¹ A' being the end pieces, in which are
the hearings b, b, whilst A A are the distance pieces, truly faced on ends and
bolted to AA. The bearings b, b carry the shaft B; free to revolve on this
shaft is the belt pulley E kept in its position by the piece r. Fastened on shaft B,
and forming practically part of it, is the winding barrel F, with the usual flanges.
Attached to these flanges are portions of the clutches a a on the inclined surfaces
of which slide (lengthways) the clutch blocks ff, which are faced with hard
wood.
The cylindrical or "rim" portions of the driving and brake clutches are
marked d and d" respectively, they are alike, and one is bolted to the driving
pulley E, to give the revolving or lifting motion; and the other to a circular plate
which is made in one with the end frame, to give the stopping or brake action.
These parts d¹ d" are so formed that when bolted to the palley, and plate of frame
respectively, they leave a space or groove between them on the inside; into these
grooves fit easily projections or flanges hh, formed on the clutch blocks ff. When
the actuating lever O is moved towards the driving pulley, it forces the shaft B,
and with it the barrel I, in the same direction; this causes the sliding blocks f
to move outwards and engage with the clutch rim d', which being revolved with
the driving pulley drives the barrel. The flanges or projections on clutch
blocks ffkeeping them from moving axially with the shaft B and parts attached;
but fitting easily in the groove they allow outward or inward motion, so that when
the lever is released, the spring at m pushing the shaft back does not carry the

page_text: blooks with it, but they simply move inwards and release the driving action. The
same control of the brake sliding blocks is given by the flanges on them.
The "rim" portions of clutches d₁d" are made of such a diameter that they
will pass over the flanges of barrel F, out of the way, and so allow of easy
inspection of clutch surfaces: dd" are siraply bolted to their adjoining parts, and
to keep them true and central, they fit on slightly projecting portions turned on
both the pulley and frame plate. This arrangement keeps the outward stress of
clutch gear self-contained in the rims d' d", and relieves the frame of such stress.
The belt pulley E may be replaced by any suitable driving gear, and the barrel F
by any suitable mechanism to transmit the revolving or winding action to the load;
the parts a a being attached in a suitable manner so as to form practically one
piece with shaft B.
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 construction, and method of keeping the clutch blocks from moving
axially, whilst allowing of outward and inward motion, by the formation of a
groove and flanges on the said blocks to work in the groove as shown and
described.
2. The arrangement, form and manner of attachment of the rim portions of
clutch "d" as shewn and described, so that by undoing the bolts that fix them,
they can be easily removed and passed over the adjacent portions to allow of
inspection of clutch parts.
3. The particular form of framing of channel section as shewn and described.
4. The combination of the special form of clutch rims "d" with grooves, and
flanges on clutch or sliding blocks; and the particular form of framing as shown
and described.
5. The combination of the special form of clutch rims "d," with grooves, and
flanges on clutch or sliding blocks, with or without the particular form of framing
shewn and described.
Dated this Third day of December 1895.