Year: 1897

page_text: I, JAMES YATE JOHNSON, of 47 Lincolns Inn Fields in the County of London
Gentleman, do hereby declare the nature of this invention (which has been com-
municated to me from abroad by The Societé Anonyme des anciens Etablissements
Panhard et Levassor of 19 Avenue d' Irvy, Paris in the Republic of France) to be as
follows:-
This invention relates to improvements in friction couplings, by which great
elasticity is obtained at the part of contact between friction cones, so that a driving
stress, variable and adjustable at will by the relative displacement of the cones,
thrown into contact, is produced, irrespective of the condition of their surface or the
more or less perfect centering of the constituent parts. This result is obtained
according to this invention by providing elastic parts or blades upon the surface of
one of the friction cones.
The following is an arrangement according to this invention. Of the two friction
cones the one is fixed to a driving shaft, whilst the other cone is mounted with
slight friction on the driven shaft, and can be moved longitudinally upon the driven
shaft towards or away from the fixed cone. This movement may be obtained by
means of a lever turning on a fixed point, and acting on a rod.
The front portion of the cone on the driven shaft is provided with a circular groove
in which are situated spring blades fixed to the cone which can be done by means of
rivets. These blades may be arranged end to end all over the periphery of the
groove. The radius of the curve to which they are bent, may be larger than that of
the groove; and the blades be fixed by means of rivets, at their centre; their ends
forming projections upon the surface of the cone and producing a lifting action upon
the face (of leather or equivalent material) with which the cone on the driven shaft
is covered. Or the radius of the curve of the blades may be smaller than that
of the groove; each blade being fixed by a rivet passed through one of its ends, so
that the central portion of the blades projects from the cone, and lifts the leather or
like face.
These elastic blades, in whichever way they be mounted, thus have the effect of
raising the face of the leather, or other covering of the cone, thereby enabling the
said cone to exert upon the cone on the driving shaft an elastic pressure which
gradually increases simultaneously with the effort by which the cone on the driven
shaft is forced into the other cone. The pressure exerted by these springs, must be
such that under the maximum stress which tends to force the one cone into the other
cone, combined with the angle of the conical parts of the coupling, the elastic blades

page_text: become completely flattened in the groove so as to admit of the two communicating
conical surfaces, coming into complete contact.
The mechanism for actuating this coupling may be arranged for directly trans-
mitting to the two cones to be thrown into gear, all the stress or effort which is
brought into play so that the coupling is effected without any external reaction being
produced upon the supports of these pieces For this purpose the driven shaft is
provided with a head turning with but slight friction in the part receiving it on the
driving shaft. The cone of the driven shaft is mounted with but slight friction on the
said shaft, and in its rotation carries the said shaft around with it, by means of
tenons carried by the driven shaft which engage with grooves, provided in the hub of
the cone, of the said shaft. A rod passing through the axis of the driven shaft is
connected to the hub of the cone thereof by means of a cottar. By acting upon this
rod the said cone is caused to advance or recede upon the driven shaft. A spring acts
upon the rod through a ring, this spring receiving its point of support from an
abutment of the driven shaft, and thus forcing the cone of that shaft into the other
conc. The reactions exerted on the one hand by the spring upon the driven shaft,
and on the other hand through the intermediary of the rod, and of the cone upon the
driven shaft, are counteracted by the action of the head upon the driving shaft. The
effort employed in effecting the engagement, is thus supported by the reciprocal
actions of the driving and driven shafts without reaction being produced by the exterior
parts. During the disengaging operation, the traction exerted upon the rod causes
the driven shaft to exert a pressure upon a fixed support which at the same time serves
as a brake for stopping the said shaft.
When the rod is moved in one direction by its lever as aforesaid the contact
between the two cones will be interrupted and while the driving shaft continues to
rotate, the driven shaft will be uncoupled and become motionless. When the said
lever is so acted upon as not to counteract the tendency of the spring to force the rod
forward, contact is automatically established between the elastic surfaces, covering the
cone on the driven shaft and the corresponding part of the other cone. There will be
an elastic contact between the two cones, forming the first stage of the coupling
operation under sliding action, subsequently in proportion as the cone on the driven
shaft is moved nearer to the other cone, the elastic blades become flattened, and a more
thorough contact is produced, which completes a perfect coupling when the elastic
blades are flattened and the two cones thus are brought into direct contact.
Dated this 20th day of Doaumhor 1907
JOHNSONS & WILLCOX
47 Lincolns Inn Fields London W.C. Agents.
I, JAMES YATE JOHNSON of 47 Lincolns Inn Fields in the County of London
Gentleman, do hereby declare the nature of this invention (which has been
communicated to me from abroad by the Société Anonyme des anciens Etablissements
Panhard et Levassor of 19 Avenue d'Irvy, Paris in the Republic of France) 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 friction couplings, by which great
elasticity is obtained at the part of contact between friction cones, so that a driving
stress, variable and adjustable at will by the relative displacement of the cones,
thrown into contact, is produced, irrespective of the condition of their surface or the
more or less perfect centering of the constituent parts. This result is obtained according

page_text: to as invention by providing casti p
friction cones.
In order that this invention may be readily understood, I will describe with
reference to the accompanying drawings an arrangement in accordance therewith.
Figure 1 shews the coupling device partly in longitudinal section.
Figure 2 is a detail view representing the method of mounting the elastic parts
upon the inner cone.
Figure 3 shews the method of mounting these elastic parts in a slightly modified
form.
1 and 2 are two friction cones, the cone being fixed to the driving shaft 3, whilst
the cone 2, is mounted with slight friction on the driven shaft 4, The cone 2 can be
moved longitudinally upon the shaft 4 towards or away from the cone 1. This
movement of the cone 2 may be obtained by means of a lever 5 turning on a fixed
point 6 and acting on a rod 15 as hereinafter explained.
The front portion of the cone 2 is provided with a circular groove 8, in which are
situated spring blades 9, fixed to the cone 2 which can be done by means of rivets 10.
These blades may be arranged end to end all over the periphery of the groove 8.
The radius of the curve, to which they are bent, may be larger than that of the
groove; and the blades be fixed by means of rivets at their centre; as shewn in
Figure 2 their ends forming projections upon the surface of the cone and producing
a lifting action upon the face 11 (of leather or equivalent material) with which the
friction cone 2 is covered. Or as shewn in Figure 3 the radius of the curve of the
blades may be smaller than that of the groove; each blade being fixed by a rivet
passed through one of its ends, so that the central portion of the blades projects from
the cone and lifts the leather or like face 11.
•
These elastic blades, in whichever way they be mounted thus have the effect of
raising the face of the covering 11 of the friction cone 2, thereby enabling the
latter to exert upon the cone 1 an elastic pressure which gradually increases simul-
taneously with the effort, by which the cone 2 is forced into the cone 1. The
pressure exerted by these springs, must be such that under the maximum stress,
which tends to force the cone 2 into the cone 1, combined with the angle of the
conical parts of the coupling, the elastic blades or springs become completely
flattened in the groove, so as to admit of the two communicating conical surfaces
coming into complete contact.
The mechanism for actuating this coupling may be arranged as shewn in the
drawings directly transmitting to the two cones to be thrown into gear, all the
stress or effort which is brought into play so that the coupling is effected without
any external reaction being produced upon the supports of these pieces. For this
purpose the shaft 4 is provided with a head 12, turning with but slight friction in
the part receiving it on the shaft 3. The friction cone 2 is mounted with but
slight friction on the said shaft 4, and in its rotation carries the said shaft
around with it, by means of tenons 13 carried by the shaft 4 which engage with
grooves 14, provided in the hub of the cone 2 of the said shaft. A rod 15 passing
through the axis of the shaft 4, is connected to the hub of the cone 2 by means
of a collar 16. By acting upon this rod the cone is caused to advance or recede
upon the shaft 4.
A spring 17 acts upon the rod 15 through a ring 18 this spring
receiving its point of support from an abutment 19 of the shaft 4 and thus forcing
the cone 2 into the cone 1. The reaction exerted on the one hand by the spring 17
upon the shaft 4, and on the other hand through the intermediary of the rod 15 and
of the cone upon the shaft 4, are counteracted by the action of the head 12 upon
the shaft 3.
The effort employed in effecting the engagement, is thus supported by the
reciprocal actions of the two shafts 3 and 4 without reaction being produced by the
exterior parts. During the disengaging operation, the traction exerted upon
the rod 15 causes the shaft 4 to exert a pressure upon a fixed support 20 which at
the same time serves as a brake for stopping the shaft 4.
Presuming the rod 15 to be moved to the left by causing the lever 5 to turn on

page_text: the centre 6, the contact between the two cones will be interrupted and while the
shaft 3 continues to rotate, the shaft 4 will be uncoupled and become motionless,
.When the lever 5 is so acted upon as not to counteract the tendency of the spring 17
to force the rod 15 forward by pressing against the washer 18, contact is automati-
cally established between the elastic surfaces, covering the cone 2 and the correspond-
ing part of the cone 1. There will be an elastic contact between these two cones,
forming the first stage of the coupling operation under sliding action; subsequently
in proportion as the cone 2 is moved nearer to the cone 1, the elastic blades become
flattened, and a more thorough contact is produced, which completes a perfect
coupling when the elastic blades are flattened and the two cones thus are brought
into direct contact.
I do not limit myself to the precise details shewn in the drawings.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
4. The combination with couplings of elastic parts or springs upon the periphery
of the cone of the coupling which is carried by the driven shaft; and projecting from
the surface of the cone so as to become gradually flattened when the two friction
cones are brought into contact, substantially as hereinbefore described.
2: In-couplings-the-means- for effecting-the-coupling-action-the-said--means-con-
sisting of a rod-traversing the driven-shaft, and subjected-to-the-action-of-a-return-
spring-substantially-as-koreinbefore-described-and-shewn--in-the-accompanying
drawings: