IMPROVEMENTS IN THE MECHANISM OF CLUTCHES.
Year: 1879

page_text: LETTERS PATENT to Joseph Samuel Taylor and Stephen William Challen, of
the Derwent Foundry, Birmingham, in the County of Warwick, Engineers,
for the Invention of "IMPROVEMENTS IN THE MECHANISM OF CLUTCHES.
PROVISIONAL SPECIFICATION left by the said Joseph Samuel Taylor and
Stephen William Challen at the Office of the Commissioners of Patents on
the 18th December 1879.
JOSEPII SAMUEL TAYLOR and STEPHEN WILLIAM CHALLEN, of the Derwent
Foundry, Birmingham, in the County of Warwick, Engineers, "IMPROVEMENTS
IN THE MECHANISM OF CLUTCHES, WHEREBY THEY ARE MADE SELF-ACTING AND
ADJUSTABLE."
Our Invention relates to new combinations of and arrangements of the mechanisın
we use in the construction of the clutches we employ to transmit and arrest motion,
and by means of our improvements we are able to obtain positive control over the
motion of such primary and other rotating shafts as are employed in machines or
machinery, and more especially in power presses.
The object and use of our improved clutch in all cases is to transmit or
communicate rotary motion from a spur wheel, or a fly or other driving wheel, or
arm, or lever kept in continuous rotation by the motive power to a press or other
machine shaft, and consequently to the mechanism actuated by the said shaft, in
such a way as to be able absolutely at any precise point of its rotation to arrest the
motion of the said shaft by means of the self action of the clutch.
The advantages derivable from the use of our self acting adjustable clutch consist
in the means obtained whereby the motion of a machine and more particularly
the motion of a power press can be arrested at any point of its rotation either
immediately before the stroke of the press or machine, or afterwards, or at any
intermediate part of the rotation of the press or machine shaft, coincident with the
arresting point to which the adjustment is set, although the lever which permits
the clutch to disengage itself at that point be released or moved either by the hand
or, by preference, the foot of the attendant at any other part of a single rotation
and before arriving at such arresting or adjustable point.
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1010a

page_text: We will now describe two modified arrangements of the mechanism and action of
our clutch as adapted to power presses, one of such modifications being designed for
operating such large size presses as are capable of performing heavy work and the
other for small presses intended for light work.
1st. The mechanism of our clutch as adapted to large presses comprises a spur or
driving wheel furnished with a movable catch either secured to the wheel to act on a
fixed centre as a pawl or fitted into and capable of sliding in a radial slot or groove
formed contiguous to the boss on one of the arms of the spur driving wheel, which
is mounted on the back end of the press shaft and revolves freely and independently
thereon, and by means of the clutch imparts motion to the press, when desired,
itself being kept in constant rotation by the motive power.
Fixed upon the press
shaft, the motion whereof is to be placed under control, is a driving boss which
may be either forged thereon or keyed or otherwise firmly secured thereto. This
boss, placed close to the driving wheel, is furnished with either a recess, or a pro-
jection, or tooth, with, into, or against which the movable catch on the driving
wheel is intended to engage. A cam having formed on its face an annular slot or
groove, wherein is fitted an adjustable stop pin with fixing nut, is mounted on the
front end of the boss, which is turned down to form a bearing on which, concentric
with the press shaft, it is free to revolve. The cam is made to lift the movable
catch out of gear by means of a foot lever which is connected to a sliding bolt or
bar wherein is a spiral spring. This bolt regulates the motion of the cam through
which the action of the press placed under perfect control. The catch after each
lift is returned to its normal position by a spring or other contrivance.
The following describes the action of the clutch and the manner it is operated :-
So long as the sliding bolt is forced backwards by the spiral spring it prevents the
rotation of the cam, and the pawl or sliding catch continues at each revolution of
the driving wheel to be lifted out of the line of contact with the recess, or projection,
or tooth on the driving boss. During this time the driven shaft ceases to revolve.
But when by the pressure of the attendant's foot or hand on the lever the sliding
bolt is withdrawn the cam is carried round by the catch, which then engages with
the recess, projection, or tooth on the driving boss, and by this means motion
is given to the shaft and the rotation of the shaft is continued so long as the foot
or hand of the attendant is pressed upon the lever. When the pressure on the
lever is again relaxed and the bolt released the latter is by the reaction of the spiral
spring forced into its original position so that the stop pin of the cam in the course
of its revolution comes into contact with the end of the bolt and arrests the motion
of the cam, and thereby at the precise point of rotation at which the stop pin is
set the catch is lifted out of driving contact. Therefore all that is required to vary
the position of the arresting point is to fix the stop pin in a different part of the
annular slot or groove in the cam coincident with the point of rotation at which
the shaft of the press or other machine is required to stop.
2nd. According to this modification, which as before stated is more especially
applicable to small presses adapted to perform light work, a heavy rimmed fly
pulley driven by a strap on its periphery is substituted in place of tho spur gearing
or driving wheel and either the sliding catch or a pawl free to move on a fixed
centre or stud may be employed. The driving boss is fixed upon the shaft of the
press, as already described in the first part, but the cam is fixed to the end of the
sliding bolt and consequently is made to slide to and fro in and out of contact with
the catch in one direction by pressure of the foot lever and in the other or contrary
direction by the reaction of the spiral spring.
In the construction of some of our larger size presses we prefer to use the pawl
instead of the sliding catch, and in some of our small presses we find it convenient
to use the sliding catch as a substitute for the pawl, and although we have described
our Invention as specially adapted to power presses wo shall hereafter lay claim to
its use in machines generally.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Sainuel Taylor and Stephen William Challen in the Great
Seal Patent Office on the 18th June 1880.
JOSEPH SAMUEL TAYLOR and STEPHEN WILLIAM CHALLEN, of the Derwent
Foundry, Birmingham, in the County of Warwick, Engineers. "IMPROVEMENTS
IN THE MECHANISM OF CLUTCHES, WHEREBY THEY ARE MADE SELF-ACTING AND
ADJUSTABLE."
Our Invention relates to new combinations and arrangements of the mechanism
we use in the construction of the clutches we employ to transmit and arrest motion,
and by means of our improvements we are able to obtain positive control over the
motion of such primary and other rotating shafts as are employed in machines and
machinery, and more especially in power presses and otherwise.
The object and use of our clutches in all cases is to transmit or communicate
rotary motion from either a spur wheel, a fly wheel, or other driving wheel or
pulley, radial arm, or lever respectively kept in continuous rotation by the motive
power to a press, machine, or other shaft, and consequently to the mechanism
actuated by the said shaft, and this is done in such a way that when required we
are able absolutely at any precise point of its rotation to arrest the motion of the
said shaft by means of the self-action of the clutch.
Our self-acting adjustable clutch may be employed for driving heavy shafts and
shafting or light delicate machines. It is easy to operate and certain in action, and
being capable of self-liberation at any desired point in the rotation of the shaft on
which it is mounted its usefulness is obvious and undeniable.
These advantages are particularly marked in the case of many kinds of machines
wherein it may be either at some or at all times desirable that motion be arrested
at a special point in the rotation of the driving shaft of such machines, which driving
shaft is a portion thereof, and when set in motion actuates all the operating parts.
In some machines, and in power presses especially, such positive control over their
motion is a most important and reliable advantage, as by such control we are able
to stop the rotation of the press or machine shaft, either immediately before the
stroke of the press or machine, or afterwards, or at any intermediate part of the
rotation of the press or machine shaft coincident with the arresting point to which
the adjustment is set, although the lever which causes the clutch to disengage itself
at that point be released or moved (either by the hand or by preference the foot of
the attendant or otherwise) at any part of a single rotation, and before arriving at
such arresting or adjustable point.
First. We will describe in this part of our Invention our primary arrangement
of the mechanism of our self-acting adjustable clutch, as adapted to transmit
motion to such a large size power press as is capable of performing heavy work,
and as shown both in combination and detail on Sheet 1 of the accompanying
Drawings, the letters and figures of reference agreeing with the letters and figures
marked thereon, that is to say :-
Fig. 1, on Sheet 1, exhibits a side view of one of our large size power presses,
and shows the position, general compactness, and the mode of operating the clutch ;
Figs. 2 and 3 show on a larger scale the several parts of the clutch in combination ;
and Figs. 4, 5, 6, 7, 8, and 9 are separate views of the operating details.
In Fig. 1 A represents the cast iron body of a large power press, showing the
position of the clutch contiguous to the spur driving wheel B, which is kept in
continuous rotation by the pinion H and the strap pulley H' direct from the motive
power, and is mounted to revolve freely and independently on the back end of the
press shaft C, being kept in place by the cap, washer, and screw C¹. B¹ marks a
socket cast upon the spur wheel to receive the jointing end of the pawl B² (see
Fig. 6) wherein the latter articulates after the manner of a knuckle joint. B³ shows

page_text: a short arm, which is forged, formed, or cast projecting from the pawl and in one
piece therewith, and fixed on the free end of this arm is a stud which carries B', a
small roller. B³ is a spiral spring that pulls down the pawl after it has been lifted.
D indicates the driving boss, which is keyed or otherwise securely fixed on the
press shaft close to the front face of the spur wheel. Cast or forged upon the boss
is the projecting driver piece D', against which when motion is imparted to the
shaft the free end of the pawl D² engages. The front end of the boss at D³ (sec
Figures 2 and 4) is turned down to receive the cam E, which in its normal condition
is free to rotate thereon. This cam (see Figures 1, 2, 3, and 5) controls the action of
the pawl by means of a projecting piece or lift E' fixed or cast upon its periphery,
and cut out of the front face of the cam is an annular dove tail groove E2, which is
formed to receive E³ that marks a small adjustable dove tail slide (see Fig. 8) into
which the threaded end of the stop pin E (see Figures 2 and 7) is firmly screwed, so
as to fix the slide at any desired part of the annular cam groove; the head of the
pin projecting from the front face of the cam (see Fig. 2) forms a rigid stop. F
marks a sliding bolt which controls the action of the cam. The rectangular outer
end of this bolt works to and fro through an opening of corresponding form made
through the back of the body of the press, two thirds of its length (see Figures 2 and 9)
being turned down to receive a spiral spring F¹, the turned extremity of the bolt
being supported by F, a fixed carrier, which also answers to resist the end pressure
of the spiral spring. G is a foot lever that finds a fulcrum on G₁, which marks a
stud fixed in the casting of the press body. The extreme end of the top arm of
the foot lever passes through an opening (see Figures 1, 2, and 9) formed in the
rectangular end of the sliding bolt, and engages therewith so as to force the
rectangular shoulders of the bolt against the end of the spiral spring F' when
the foot plate G2 at the lower end of the lever is pressed upon by the attendant's
foot, during which time the clutch being in gear the shaft C continues to revolve
and the press operates, but the moment the foot pressure is removed the reaction of
the spiral spring F¹ forces out the sliding bolt F, which causes the clutch to through
itself out of gear, and simultaneously therewith the rotation of the shaft C ceases,
and the working of the press is stopped.
The following more particularly describes the action of the clutch and the mode
in which it operates, the stop pin E being adjustably fixed in the annular groove
of the cam coincident with the desired arresting point in the rotation of the press
shaft: When (as before stated) the foot pressure is removed from the lever G and
the sliding bolt is forced out by the spring F, its projected end stops the rotation
of the cam E by contact with the head of the stop pin E. The cam lift E¹ (being
then held stationary) by engaging with the roller B on the pawl arm every revo-
lution of the spur wheel the free end D2 of the pawl is lifted so as to avoid contact
with the driving stop or piece D¹ of the boss, and therefore during this time the
shaft C ceases to rotate, the cessation of motion at any precise point in the rotation
of the shaft being determined by the position in which the stop pin E has fixed
the slide E³ in the annular groove of the cam; but when by the pressure of the
attendant's foot on the foot plate G² the outer end of the sliding bolt is again
withdrawn from contact with the can stop pin, the cam E being then immediately
set free, will no longer raise the pawl, which then engages with the driving projec-
tion D' on the boss D, and so long as the withdrawal of the sliding bolt is main-
tained the shaft C continues to rotate and operate the press or other machine to
which such driven shaft may belong.
Second. According to this modification, which is more particularly applicable to
such small power presses as are adapted to perform light work, we describe a clutch
suited to a press of this kind, and shown on Sheet 2 by Fig. 1, and the parts of the
clutch in combination are exhibited on a larger scale by Figures 2 and 3, whilst such
parts separately are shown by the Figures 4, 5, 6, and 7. In these light presses a
heavy rimmed fy pulley J, driven continuously direct from the motive power by a
strap on its periphery, and mounted on the back end of the press shaft C, is substi-
tuted in place of the spur wheel and driving gear shown on Sheet 1, and instead of

page_text: the pawl a catch bolt K is employed to engage with the fixed driving boss D, which
(as in the first part) is furnished with a projecting driving piece D' (see Fig. 5).
The catch bolt K, it will be seen in Figures 2 and 3, is fitted to slide radially in guides
K' fixed or cast on one of the arms of the fly pulley, and through the lower end of
the catch bolt K is passed a screw bolt K2 that carries on its fore end K³, which
marks a small roller that is intended to engage with the projecting cam lift L'
formed on the periphery of the annular cam L. This cam (shown by Fig. 4 and
seen in Figures 2 and 3) is supported by, and (for the purpose of adjustment only) is
free to turn upon the hub M, which is cast projecting from the body of the press;
when however the cam lift L' has been adjusted to raise the catch bolt K at the
desired arresting point the cam L is rigidly fixed by the nut N2 in the recess N'
which is formed on the outer end of the sliding bolt N (see Figures 2, 3, and 6), and
it then slides on the projecting hub M when it is moved to throw the clutch in and
out of contact with the small catch roller K³. When required to set the press in
motion the sliding bolt N is drawn in by pressure on the foot plate of the lever G,
as described in the first part, and in the same way the sliding bolt is projected or
forced outward by the reaction of the spiral spring N³ when the pressure is removed
for the purpose of arresting the motion of the shaft, which takes place as soon in
the course of rotation of the fly pulley as the catch roller K³ comes round to and is
raised by the cam lift L', and by this means the catch bolt K is lifted every suc-
ceeding rotation out of contact with the rigid driver piece D¹ on the driving boss D.
It will now be seen that the principle of action in this modification is identical with
our primary arrangement as previously described in the first part, the only differences
consisting in the changed form and mode of operating the annular cam L, and the
substitution of the fly pulley, the catch bolt K, and the pressure spring K¹ in place
of the spur wheel, the pawl, and spiral spring, and which in practice we find most
suitable for driving heavy presses and machines.
We also show on Sheet 2 of the Drawings, by the Figures 8, 9, 10, 11, and 12,
another modification of our clutch, in which, in lieu of the driving catch bolt just
described, we substitute a driving catch marked U (see Figures 8, 9, and 10). This
catch is disposed in a position lengthwise between two of the arms on the boss of
the fly wheel, and parallel with the shaft of the press, its back end U¹ being jointed
to the boss, whilst its front or free end U2, which is pressed down by a flat spring
marked U³ (see Figures 8, 9, and 12), is capable of being raised out of the rectangular
recess V¹ that (see Figures 8 and 11) is cut out crosswise in the periphery of the
driving boss V. Adjustably fastened on the boss of the cam W there is an annular
clip marked X (see Figures 8 and 9), the ends whereof X' are bent to meet at a right
angle, and being (in order to tighten the clip round the cam W) firmly bolted
together, they are made to answer the purpose of a stop pin, to arrest the motion of
the cam by engaging with the end of a sliding bolt or any other stopping device
that may be employed, and operated either by a foot lever, as shown on Fig. 1,
Sheet 1, or a hand lever, as shown on Sheets 3 and 4, or otherwise.
In the working of most power presses and in operating many machines, it is of
considerable importance that constant attention on the part of the attendant be
secured, and this is effected by our clutch which throws itself out of gear whenever
the foot pressure is removed from the foot plate of the lever G. There are however
in many cases machines of a certain class, and rotating shafts employed, where the
constant attention of an attendant is not necessary, and in such cases we prefer to
move the sliding bolt by a hand lever or otherwise in both directions, and some-
times we employ a catch or detent to fix the lever in either of two positions
respectively to keep the machine or shaft in constant action, or to stay its motion.
when required.
Third. This part of our Invention relates to another modification of our clutch
adapted to drive or arrest the motion of any ordinary shafting or shaft whether
belonging to a machine or otherwise, and is einployed in such cases only as require
no alteration in the point of arrest of motion. This clutch is shown by the Figures
on Sheet 3, amongst which Fig. 1 represents a longitudinal section of the clutch on.

page_text: the shaft; Fig. 2 shows an end view; Fig. 3 a plan; Figs. 4 views of a catch driving
key, and Figs. 5 views of a sliding bolt. In this clutch the driving boss is simply
a swell on the shaft on which the wheel runs freely, and the cam is made in one
piece with the sliding bolt R, the outer end thereof R' being cranked or bent to a
right angle (see Figs. 5) and on one side such bent piece is fashioned or shaped to
the form of a wedge or incline.
In Figures 1, 2, and 3, Sheet 3, O marks the shaft which is to be driven by the
clutch, and T and T¹ mark two fixed bearing blocks in which the shaft rotates.
P marks the spur wheel which is kept continuously revolving by the motive power
and is mounted to revolve freely on the enlarged portion of the shaft O¹. The spur
wheel is kept in place on one side by a collar formed on the shaft, and on the other
side by the face of the bearing block T. At one part marked P¹ between two of
the arms of the spur wheel its boss is strengthened to admit of a deep key groove
being cut therein, and a slightly wider corresponding key groove is longitudinally
cut in the enlarged portion of the shaft which carries the spur wheel.
Also a
radial key guide P2 is formed projecting from the strengthened portion of the
boss of the spur wheel, in which guide Q, which marks the vertical arm of the
driving key Q (see Figs. 1, 2, and 4), is fitted to slide radially when by means of
the projecting key lift piece marked Q, the driving key is by the wedge or incline
formed on the cranked end R₁ of the sliding bolt, lifted out of 02 which marks the
driving key groove in the shaft. Q is a spiral spring supported by the bolt Q
which is screwed into Q2; Q5 is the bolt guide (see Figs. 1 and 2); R represents
the sliding bolt, shown mounted in guides R³, in Figs. 1 and 2, and separately by
the Figs. 5. This bolt for ordinary purposes may be operated by a hand lever, as
shown at S, which lever finds a fulcrum on S¹, that indicates a bracket cast projecting
from the bearing block T. The outer cranked end R' of the sliding bolt, by means
of its incline when the bolt is projected by the hand lever, lifts the driving key Q
out of the key groove O³, when in the course of each revolution of the spur wheel,
it comes into contact with Q, which marks the key lift piece formed on the vertical
arm of the key, so long as the bolt is maintained in this projected position, at each
suceeding revolution of the wheel, the sliding in of the key is prevented and the
shaft remains stationary. But when by a contrary movement of the hand lever
the sliding bolt is withdrawn, the driving key when it reaches a position coincident
with the key groove in the shaft, is immediately forced therein by the spring Q³,
and simultaneous therewith the shaft is set in motion.
Fourth. In this, the last part of our Invention, we show on Sheet 4 a clutch
further modified in the configuration and disposal of some of the parts, but it is
constructed to act precisely on the same principle as those already described. This
clutch may be used for either heavy or light presses, the small force required for
bringing it into action being in both cases the same.
Fig. 1 exhibits the front view of one of our power presses, and Fig. 2 a side
view of the same both being marked W. a marks the press shaft, and b the
fly wheel which is mounted on the end of the shaft where the latter is made
somewhat larger in diameter. The fly-wheel, as already described in the preceding
modifications, is kept in constant rotation by the motive power. It is shown in
vertical section C to D, and in horizontal section A to B, as marked on Fig. 4. In
large presses of this class a spur wheel driven by a toothed pinion that is actuated
by the motive power (as seen on Sheet 1) is generally employed. The driving
key c of this clutch is made to engage in a longitudinal key groove a¹ cut in the
enlarged end of the shaft on which the fly wheel rotates (in the manner described
with reference to Sheet 3 and shewn by the Figs. 1 and 4), but instead of having
only one vertical arm in this clutch it is shown to be furnished with two c¹ and c
one of such arms being at each end (see Fig. 9). Cut in the outer edge of each arm
there is a rectangular notch, respectively marked c³ and c, and these notches are
made for the reception of the free ends of two small levers marked d¹ and d³, which
are fixed (one on each end of the small rocking shaft d the arm d² carrying the
lifting roller c (see Fig. 5) which is intended to engage with the cam lift 5. The

page_text: slides
rocking shaft when in its place is disposed in the bearing hole ³, shown in Figs. 1
and 4, in a projecting hub placed near the boss on one of the arms of the fly wheel,
close beside 6 which marks a solid radiating enlargement of the boss, the
corresponding enlargement b² on the opposite side being intended to act as a
counterpoise to balance the wheel. The enlargement 61 is radially grooved on each
side or face of the wheel, and there is a key way 63 made longitudinally through the
boss so as to communicate with the two side grooves which are marked b. In
this key-way the driving key c is placed with its two vertical arms free to slide up
and down in the side grooves 64, and when, as the fly wheel rotates, the key
groove a¹ in the press shaft a comes into coincidence with the key-way b³, the
key c (unless it is kept out by the arms of the rocking shaft) is forced into the key
groove a¹ by the spring (shown in Fig. 2 and by Fig. 7). This spring in Fig. 2
is seen to be mounted on the presser rod g (Fig. 6), the smaller or lower end
whereof, after passing through the small guide hole (marked 66) drilled through the
enlarged part of the boss of the fly wheel (as seen in the vertical section C to D),
rests upon and is always by means of the spring f kept constantly pressing at x
(see Fig. 9) on the top side of the key c. The upper end of the pressure rod
in b' which marks a guide hole made in a radial direction through the solid rim of
the fly wheel, and the necessary amount of tension or force is put upon the spring
by the nuts g'. Upon the projecting boss ' of the cam h there is placed 2 which
marks an annular adjustable clip, the ends whereof h³ are respectively bent outwards,
and are fastened together by the screw * (see Figs. 3 and 11), and which at the
same time tightens the clip on the projecting boss of the cam. The cam is mounted
upon the press shaft a close beside the boss of the fly wheel, and with the clip is
free to revolve on the press shaft, filling the space between the boss of the wheel
and the shaft bearing (see Fig. 1). The motion of the cam, and consequently the
shaft, is arrested at any desired point in its rotation by raising the handle
the small hand lever i, which finds a fixed fulcrum on the bolt j that is screwed
into the solid metal of the body of the press. The raising of the handle brings the
part of the lever into such a position that the projecting ends ³ of the clip
(which in this modification perform the same service as the adjustable slide and
stop pin marked E' in Figs. 2 and 7 on Sheet 1) are stopped at the point of rotation
to which the adjustment is set by coming into contact with the detention stop ¿¹
on the raised end of the lever, which at once stops the rotation of the cam h, and
immediately, during the same revolution of the fly wheel, the small roller e on the
end of the arm d² of the rocking shaft d comes into contact with the cam-lift h³
and, by means of the arms of the rocking shaft, the key c is lifted out of the key
groove in the shaft a, the motion whereof is thereby arrested, and this is repeated
each succeeding rotation until the handle of the lever i is again depressed, and then
the ends of the clip are again set free. The cam then becoming loose on the
shaft has lost its power of lifting the roller on the end of the arm of the rocking
shaft, consequently the driving key remains in the key groove and the press shaft
continues to rotate and operate the press until the handle of the hand lever is again
raised, when the motion of the shaft is again arrested by the detention of the cam,
as above described.
of
Fig. 3 shows a hand lever in combination with a cam and clip, designed for
engaging with the projecting ends of the latter, and thereby stopping the notion of
the cam irrespective of the direction in which the fly wheel rotates.
Having now set forth the object, use, and advantages of our Invention, and fully
described and exhibited on the Drawings the several parts in combination and
separately in detail, and having also explained its construction, its action, and the
mode of operating it, we wish to state that both iron and steel will generally be
employed in its construction, and that we do not confine ourselves to any special
shape, strength, or dimensions, as in all cases we are governed by the nature of the
work to be accomplished and the resistance to be overcome, neither do wo confine
ourselves to the precise disposition of the several parts so long as they are kept in

page_text: combination and within the scope and limits of our Patent Right, and therefore
what we claim as our Invention is the following, that is to say,-
First. We claim the primary arrangement of the parts and details of our self-
acting adjustable clutch, as described in the first part of this Specification and
shown by the Figures referred to on Sheet 1 of the accompanying Drawings, and
we claim any colorable imitation thereof when used for similar purposes.
Second. We claim the modified arrangement of the parts and details of our self-
acting adjustable clutch, either as described in the second part of this Specification,
and shown by the Figures referred to on Sheet 2 of the accompanying Drawings, or
any colorable imitation thereof when used for similar purposes.
Third. We claim the modified arrangement of the parts and details of our self-
acting clutch, either as described in the third part of this Specification and shown by
the Figures referred to on Sheet 3 of the accompanying Drawings, or any colorable
imitation thereof.
Fourth. We claim the modified configuration and arrangement of the parts and
details of our self-acting adjustable clutch, as shown by the Figures on Sheet 4 of the
accompanying Drawings, and herein described as the Fourth part of our Invention,
and we claim any colorable imitation thereof when used for similar purposes.
In witness whereof, we, the said Joseph Samuel Taylor and Stephen William
Challen, have hereunto set our hands and seals, this Eighth day of June, in
the year of our Lord One thousand eight hundred and eighty.
JOSEPH SAMUEL TAYLOR.
(L.S.)
STEPHEN WILLIAM CHALLEN. (L.S.)