IMPROVE- MENTS IN FRICTION CLUTCHES
Year: 1882

page_text: LETTERS PATENT to Walter Alfred Barlow of 6 St Pauls Churchyard in the
City of London Patent Agent and Engineer for an Invention of IMPROVE-
MENTS IN FRICTION CLUTCHES A communication to him from abroad by
Theophilus Daimler of Cannstatt in the kingdom of Wurtemberg
PROVISIONAL SPECIFICATION left by the said Walter Alfred Barlow at the
Office of the Commissioners of Patents on the 16th September 1882.
A
WALTER ALFRED BARLOW of 6 St Pauls Churchyard in the City of London
Patent Agent and Engineer "IMPROVEMENTS IN FRICTION CLUTCHES "
communication to me from abroad by Theophilus Daimler of Cannstatt in the
kingdom of Wurtemberg.
This invention relates to certain improvements in friction clutches the object
being to obviate the defects existing in the couplings now in use (friction discs)
the objections being mainly that in as much as that these transmitters are loose
or movable on the driving shafts they wear out rapidly and that with insufficient
lubrication destroy the shafts and in some cases drag the driven shafts round
without being in gear.
These improved coupling obviates these defects as both the friction clutches are
keyed on to the driving shaft as well as on the driven shaft and the latter is made
to cooperate in the movement of throwing it in or out of gear.
The coupling consists essentially of two friction bodies the driving parts and the
driven part which are keyed on to their shafts and thus prevent their moving in
lengthwise direction.
.
The shaft of the latter resting on two journals is hollow and provided with a
spindle. On its further end are two loose bevel hand or brake wheels which
in their movements are made dependent on each other by means of an intermediate
wheel,
The support of the loose intermediate wheel is keyed on to the driving shaft.
The second hand wheel is prevented from dropping out by means of the adjusting

page_text: ring screwed on the shaft and is movable together with the boss to which it is
screwed with the spindle to which it is keyed.
When the hand wheel is turned to the right, the spindle screws itself to the head
of the driving shaft and the coupling is thus effected; when however the first hand
wheel is moved in the same direction; the other hand wheel as well as the spindle
turn backward and the coupling is disconnected.
The freed coupling disc together with its shaft is then so far moved by means
of the key in the bearing from the other coupling disc that they do not touch each
other. The key is moved by a small wheel.
The coupling therefore is effected by the turning of one of the hand-wheels and
the application of the brake likewise by the one or the other of them according to
the direction in which the transmission moves.
In one arrangemement the coupling as applied to a short transmission with
free end in which the power is transmitted by means of wheels and so forth to
the shafts close by.
In another arrangement for long transmissions where the boring cannot take
place over the whole length, and where the power is either transmitted to other
shafts or by further transmission prolongation whereby the end of the driven shaft
as well as that of the prolongation shaft is keyed onto the coupling disc however
in such a manner that a space is left between the coupling so that the coupling can
be moved by itself, by which means it is possible to move the driven shaft,
without disturbing the connected prolongation shaft.
The hand or brake wheels are fixed directly behind the driven friction bodies
and their motion is transmitted to the spindle by means of two sets of wheels and
the backward length motion takes place on an adjusting ring.
Instead of the conical teeth, the brake wheels may have the one inner and the
other outer teeth their motion being made dependent on each other by means of
corresponding intermediate wheels on the shaft.
.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Walter Alfred Barlow in the Great Seal Patent Office on the
16th March 1883.
"
a com-
WALTER ALFRED BARLOW of 6 St Pauls Churchyard in the City of London
Patent Agent and Engineer "IMPROVEMENTS IN FRICTION CLUTCHES
munication to me from abroad by Theophilus Daimler of Cannstatt in the kingdom
of Wurtemburg
This invention relates to certain improvements in friction clutches the object
being to obviate the defect existing in the couplings now in use (friction discs)
the objections being mainly that in as much as that these transmitters are loose or
movable on the dividing shaft they wear out rapidly and that with insufficient
lubrication destroy the shafts and in some cases drag the driven shafts round
without being in gear.
T
This improved coupling obviates these defects as both the friction clutches are
keyed onto the driving shaft as well as on the driven shaft and the latter is made
to co-operate in the movement of throwing it in or out of gear.
Reference is made in the following particular description to the accompanying
sheet of drawings.
The coupling consists essentially of two friction bodies the driving parts a and'
the driven part b which are keyed onto their shafts cand e and thus prevent their
moving in direction of their length.
The shaft of the part 6 resting on the journals d is hollow and provided with a
spindle f. On its further end are two loose bevil hand or brake wheels h and i
which in their movements are made dependant on each other by means of an
intermediate wheel z.
'
The support k of the loose intermediate wheel is keyed onto the driving
shaft c.
'
The second hand wheel i is prevented from dropping out by means of the
adjusting ring 1 screwed on the shaft and is movable together with the boss m to
which it is screwed, with the spindle f to which it is keyed.
When the said hand wheel is turned to the right the spindle screws itself to
the head of the driving shaft and the coupling is thus effected; when however the
first hand wheel h is moved in the same direction, the other hand wheel i as well
as the spindle turn backward and the coupling is disconnected.
The freed coupling disc b together with its shaft is then so far moved by means
of the key n in the bearing & from the other coupling disc a that they do not
touch each other.
The key n is moved by a small wheel n' as shown in detail Fig 4 (and is
situated at the rear of the parts shown in Fig. 1).
The coupling therefore is effected by the turning forward of the hand wheels and
the application of the brake likewise by the one or the other of them according to
the direction in which the transmission moves.
In the arrangement shown in Fig. 1 the coupling is applied to a .short
transmission cut with free end in which the power is transmitted by means of
wheels or pullies to the adjacent shafts
Fig. 2 is another arrangement for long transmission where the boring cannot
take place over the whole length and where the power is either transmitted to
t

page_text: other shafts or by further transmission prolongation whereby the end of the driven
shaft e as well as that of the prolongation shaft e¹ is keyed onto the coupling
disc p¹ however in such manner that a space is left between the coupling, so that
the coupling can be moved by itself by which means it is possible to move the
driven shaft e without disturbing the connected prolongation shaft e¹.
The hand or brake wheels are fixed in the latter case directly behind the driven
friction bodies and their motion is transmitted to the spindles f, by means of two
sets of wheels o p and q r and the backward length motion takes place on an
adjusting ring 7. Fig 3 is a section at line A. B of Fig 1.
Instead of the conical teeth the brake wheels may have the one inside and the
other outer teeth 8. t. (see Fig 5) their motion being made dependant on each other
by means of corresponding intermediate wheels U on the shaft V.
The arrangement of the hand or brake wheels hi may be equally well placed
in front of the friction driven part a on the driving shaft c without making any
alteration in the rest of the mechanism; the transmission part e in Fig 2 may also
be used as the driving part.
Figs 6, 7, and 8 represent a further modification of this coupling in which
a, b, c, d and e have already been described and the spring 1 is held in place by a
stud 2. The latter is connected by means of a key 3 with the ring
and the
space 5 allows of a short axial movement to the stud 2 and the ring 4. The ring 61
is loosely fitted on the shaft e
The collars 7 and 8 are loose on shaft e and have to receive the pressure of the
levers 9 and 10 and slide on the rings 4 and 6.
The levers 9 and 10 are connected together by means of the spindle 11 and
crank 12 and pivoted on the studs 14 and 15. Fig 6 represents the coupling in
gear the spring 1 presses the two parts of the clutch or friction wheels together so
that the driven part is unfailingly operated. The levers 9 and 10 are not in
contact with any of the driven parts.
Fig. 7 represents the same construction of parts shown in Fig 6 out of gear;
the spring 1 is here by drawing together levers 9 and 10 by the spindle 11 brought
into tension and drawn or moved further from the shaft c until the foot of
lever 9 touches the projection 13. In drawing the spindle 11 further out the
clutch b together with the shaft e are moved and consequently the clutch is thrown
out of gear. The pressure of the levers 9 and 10 at the same time act as a brake
on the transmission parts thrown out of gear and causes the latter to come more
rapidly to a standstill.
Having now described the nature and particulars of the said Invention I
claim:-
The improvements in friction clutches as herein described constructed and
operating as herein set forth in reference to and shown by the accompanying sheet
of drawings characterised by the following particular features vie :-
(1) The arrangement of the two friction bodies a and b, keyed on to their shafts
c and e
(2). The hand or brake wheels h and i, provided with teeth and connected with
the hollow shaft e which are made dependant on each other by means of the
intermediate wheel whereby the moving of the driven wheels is effected by
means of the spindle fin connection with the hollow shaft.
(3.) The arrangement of the couples of wheels o, p and q, r in connection with
the hollow shaft e and spindle f.
(4). The key arrangement n, n¹, for throwing the coupling discs b out of gear
(5). The modification consisting of the application, instead of the conical
teeth in the brake wheels h and i of the face wheels 8, t in connection with the
intermediate wheels U.
(6) The application of the coupling p¹, movable within itself at the ends of the
driven coupling shaft e and prolongation shaft e¹ in such a manner that the latter
need not be moved.

page_text: (7) The friction rings keyed on securely to couplings, which by an axial pressure
of springs are thrown in and out of gear by means of the spring 1 fixed by the
bolts 2 and the arrangement of lever parts 3 to 15 for compressing the spring.
In witness whereof I the said Walter Alfred Barlow have hereunto set my
hand and seal this fourteenth day of March in the year of our Lord One
thousand eight hundred and eighty-three.
WALTER A. BARLOW
(L.S.)