Improvements in Devices for Transmitting or Arresting Rotary Motion.
Year: 1895

page_text: Date of Application, 4th Sept., 1895
Complete Specification Left, 3rd June, 1896-Accepted, 4th July, 1896
PROVISIONAL SPECIFICATION.
Improvements in Devices for Transmitting or Arresting Rotary
Motion.
FREDERIC EASTMEAD and ALEXANDER CHARLES MOFFATT both of
39 Victoria Street Westminster London S.W. Engineers do hereby declare the
nature of this invention to be as follows:-
This invention relates to devices for transmitting or arresting rotary motion.
This invention consists firstly in an arrangement under which in a clutch pulley
gripping contact slippers are forced out into contact with a rotating piece with
sufficient force to transmit the motion of the rotating piece to the slippers and
through them to the piece to which they are connected.
To obtain the outward or expanding motion of the slippers we employ links
pivotted at one end to the slippers and at the other end to a collar or similar
device which has a lateral movement parallel with the axis of the shaft on which
the clutch pulley runs. These links are so arranged that when the slippers are
gripping, the links nearly or quite lie in a plane at right angles to the shaft's axis,
that is in the plane of rotation of bodies mounted on the shaft thus requiring little
or no end pressure to keep them in that position. The collar is actuated by a
screw which works a rod passing into the centre of the shaft (which is made hollow
for that purpose) and connected to the collar by a cotter or pin passing through
the collar and the rod and through a slot in the shaft, or by a forked lever or
similar device.
The contact slippers are carried in slides formed on a piece which may be either
attached to the shaft or to the pulley so that whichever is the driver the pulley or
the shaft the motion thereof may be transmitted to the driven part.
If the piece carrying the slippers is fixed to the shaft the interior of the pulley
rim or of a drum fixed to the pulley is turned and is the part gripped by the
slippers.
If the piece carrying the slippers is fixed to the pulley a hollow drum with its
interior suitably turned is fixed to the shaft and is the part gripped by the
slippers.
When two clutch pulleys are used together for forming a reversing gear such as
those used for hoists planing machines and the like, the links pertaining to each
clutch may be all jointed to and actuated by one collar which is then placed
between the pulleys. This collar may be actuated by the means already described
or may be fixed to the shaft and the necessary end motion imparted to the
shaft the other parts of the mechanism being provided with suitable sliding
attachments.
Dated this 3rd day of September 1895.
FREDERIC EASTMEAD.
ALEXR. CHS. MOFFATT.

page_text: COMPLETE SPECIFICATION.
Improvements in Devices for Transmitting or Arresting Rotary
Motion.
We, FREDERIC EASTMEAD and ALEXANDER CHARLES MOFFATT both of
39 Victoria Street Westminster London S.W. Engineers 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 devices for transmitting or arresting rotary motion.
This invention consists in an arrangement under which in a clutch or brake
gripping contact slippers carried either by the stationary or revolving part are
forced into contact with the revolving or stationary part as the case may be in
such manner as to in one case transmit the motion of the moving part to
the stationary part and in the other case to arrest the motion of the moving
part.
The
We will describe our invention and in what manner the same is to be performed
by referring to the accompanying drawings. Fig. 1 shews a pair of clutch
pulleys A & B used for a reversing gear. These pulleys run in opposite directions
on a shaft C to which it is desired to impart motion in either direction.
shaft C carries two slide pieces D and E which are keyed or otherwise fixed to it.
On these slide pieces D and E are slides or contact slippers F which in the
drawing are arranged to grip by pressing against the inside of the pulley rim.
These contact slippers Fare connected to a collar G by means of links H the
length of which is so proportioned that when the collar G which slides along the
shaft in the direction of its axis is in the middle of its travel all the contact
slippers F are clear of the pulley rim and when either pair of slippers is gripping
the links which actuate that pair of slippers are nearly if not quite at right angles
to the shaft's axis that is to say all the pins K connecting the links to the collar G
and to those slippers F which are gripping lie in a plane at right angles to the
shaft's axis so that no end pressure is required on the collar G to keep them in
that position.
The end motion is imparted to the collar G by means of a rod J passing through
a hole in the shaft C and connected to the collar by a cotter passing through the
collar and the red and through a slot of suitable length in the shaft C.
The links H are pivotted to the collar G and to the slippers F, by the
pins K.
The rod J may be actuated by hand or by a lever or as shewn in the drawing
by a screwed wheel or lever L screwed into a fixed bracket M carried on some
convenient portion of the machine the rod being isolated from the wheel or lever
by a bush or sleeve N which is prevented from rotation though free to move end-
ways; this arrangement prevents the rotary motion of the rod J being imparted
by friction to the wheel or lever.
Fig. 2 shows the arrangement as applied to a single pulley the shaft being solid
and the collar being actuated by a lever working in the groove X.
This invention may be used as a coupling for joining two shafts together in
which case the parts A and D are fixed, oue to each shaft.
This invention may also be used as a brake for arresting the motion of a
rotating body, either part A or D being fixed to the rotating body and the other
part being stationary.
The contact slippers may be faced with wood or other suitable material i
necessary or may be of such shape on the gripping surfaces as may be desired.
A separate drum of larger or smaller diameter fixed to the desired part may be
used instead of the inside of the pulley rim.
܂

page_text: Having now particularly described & ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
I. The combination of contact slippers links collar and slide pieces to form a
clutch or brake.
II. The combination of a collar links cotter rod screwed wheel or lever and non-
rotating sleeve to actuate the clutch.
111. The combination of parts as shewn in Fig. I with a hollow shaft to form a
reversing gear.
IV. Clutches substantially as described and illustrated in the accompanying
drawings.
Dated this Fourth day of June 1896.
FREDERIC EASTMEAD.
ALEXR. CHS. MOFFATT.