Year: 1886

page_text: I, JOSEPH MAY COON of Saint Austell in the County of Cornwall, Electrical
and Mechanical 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 :-
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This invention relates to frictional couplings and clutches and has for its object
to prevent the liability to slip or disengage which exists in such couplings or
clutches as usually constructed and to diminish or remove the friction arising
between the sliding part and the collar or equivalent parts employed in putting
such apparatus into or out of gear:
These improvements consist in a combination or arrangement of parts or details
including more particularly a device by means of which the constituents of the
clutch or coupling may be positively rotated together and which may be put
into operation while the apparatus is in motion, and they further consist in an
arrangement combination and addition which enables the friction at present
arising between the sliding part and the collar and' fork of other equivalent parts
or abutment to be very greatly diminished or removed.
And in order that these improvements may be more readily understood and
carried into practical effect I have hereunto, appended a sheet of drawings having
similar parts in each of the figures thereon denoted by similar letters and reference
being hereinafter had thereto.
Fig. 1 represents in longitudinal section and fig. 2 in end view a friction
coupling, and fig. 3 shows in section a clutch having these improvements applied
thereto.
A or alternatively A¹ is a portion of a shaft to which motion is imparted from
the prime motor; A¹ or alternatively A is a portion of a shaft to which motion
may be imparted through the friction clutch or coupling; B is a cone or sliding
part having a conical periphery C; D is a corresponding piece keyed or fixed on' A
and conically bored or recessed to fit upon and engage with the surface C on B ;

page_text: E is a piece capable of being moved laterally with respect to D and having fixed
or secured upon it one or more pins F parallel with A. Holes F¹ are formed in B
and D of such dimensions and in such positions that the pin or pins upon E may
pass into or through them; G is a loose collar on B having trunnions engaging
with the forked lever H; I is a loose collar on E similar to G and engaged with
the lever K. The loose collars G and I with the forked levers may be substituted
by other means for the lateral movement of the sliding pieces B and E. L is a
hand wheel by means of which the screw M may be rotated; N is a nut upon M
and attached to the end of the lever H so that by rotation of the hand wheel the
nut and consequently the lever H and the sliding piece B may be moved or slided
in either direction. The part B is prevented from rotating upon the shaft A¹ by a
feather or fast key.
When it is desired to put the apparatus into gear the hand wheel L is rotated
so as to slide the part B into contact with D when the friction between their conical
surfaces causes them to rotate together. The part E is then by means of the lever K
pressed against D and the hand wheel L is turned slightly in a direction contrary
to its previous motion. The consequent relief between B and D causes a slight
amount of slip between them and enables the pin or pins F to come opposite to and
to enter and engage with the hole or holes F¹ in B, further slip between B and D
is thereby prevented until the apparatus is disengaged.
The pressure necessary to keep B in driving contact with D being thus
diminished or removed the friction between B and G or its equivalent is
diminished or removed.
The apparatus may be disengaged by liberating E from B.
As represented in the drawings Figs. 1 and 2 the apparatus is applicable only as
a coupling between the ends of two shafts but it will readily be understood that it
may be employed as a clutch by attaching securing or forming the part B upon a
pulley P fig. 3 or other mechanism desired to be intermittently or periodically
rotated; in which case the feather upon which B alides when used as part of a
shaft coupling is. omitted and a fixed collar may be arranged upon each side of B
fig. 3 to prevent lateral motion while the part D may slide on a fixed key or
feather, the boss or part O being prolonged and fitted with a groove R in which
the collar or equivalent part may work so as to force D into contact with B. The
part E by this arrangement would slide upon the prolonged part of D.
It is well known that the parts B and D with the means for sliding B into and
out of contact with D have been in use as a frictional clutch or coupling for many
years and it will therefore be understood that I do not claim them or their com-
bination or arrangement as part of this invention.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what 4
I claim is :-
(1) In a frictional coupling or clutch or as an addition thereto, the sliding disc
or part E carrying the pin or pins F capable of passing through or into corre-
sponding holes formed in the parts D and B, in combination with the loose collar I
and the lever K or equivalent means for sliding the disc E upon its shaft, 4
substantially as and for the purpose hereinbefore described and as illustrated on
the accompanying sheet of drawings.
(2) In a frictional clutch or coupling the combination of the sliding part B and
the part D having a corresponding recess, with the sliding part E carrying the
pin or pins F capable of passing through or into corresponding holes in D and B, 5
together with devices for sliding the parts B and E, substantially as and for the
purpose herein before set forth and described and as illustrated on the accompanying
sheet of drawings.
(3) In a frictional clutch or coupling, a pin or pins or corresponding projections
passing through the part D and capable of engaging with holes or recesses in the 5

page_text: cone or sliding part B while these respective parts are in motion, substantially as
described.
(4) In a frictional clutch the combination of the part B formed upon or secured
to the part P or its equivalent, with the part D having a recess into which B may
fit; the sliding part E carrying the pins or projections F capable of passing through
or into corresponding holes in D and B, together with devices for sliding the
parts D and E, substantially as hereinbefore described and as illustrated in fig. 3
of the accompanying drawings.
Dated this twento ninth dan of Tule A Tan thawound night hundred and