Machines, Hoists, Shafting, or other Purposes.
Year: 1886

page_text: Date of Application, 13th Mar., 1886.
• Complete Left, 27th Nov., 1886.
Complete Accepted, 14th Jan., 1887.
Machines, Hoists, Shafting, or other Purposes.
We, WILLIAM HENRY LATHAM engineer, of Bolton, in the County of Lancaster,
and FREDERIC CARTWRIGHT WARD LATHAM, printer, of the same place, do hereby
declare the nature of our said joint invention for IMPROVEMENTS IN FRICTION
CLUTCHES FOR DRIVING MACHINES OR PARTS OF MACHINES, HOISTS, SHAFTING OR
OTHER PURPOSES to be as follows:-
Our invention is applicable for driving and stopping of machines or different parts
of machines, and to effect the purpose we place inside the driving pulley, which runs
loose on the shaft two or more sectors, these sectors receive an expanding action from
levers actuated by toggle joints resting on springs. The boss carrying the sectors,
levers, toggle joints and springs being secured to the shaft. A loose slotted boss on
the shaft when moved the proper distance by the setting-on rod brings the toggle
joints, levers, and springs into an upright position at right angles with the shaft, and
pressing on the levers gives an expanding motion to the sectors causing them.to press
with the necessary force upon the inside of the driving pulley the shaft by this
expanding motion of the sectors becomes locked with the driving pulley and turns
along with it until liberated, when it stops instantly. The levers, toggle joints and
springs are carried by two bosses one being secured to the shaft, and the other loose,
sliding on the shaft.

page_text: Machines, Hoists, Shafting, or other Purposes.
We, WILLIAM HENRY LATHAM, engineer, of Bolton in the County of Lancaster,
and FREDERIC CARTWRIGHT WARD LATHAM, printer, of the samo place do hereby
declare the nature of our invention for IMPROVEMENTS IN FRICTION CLUTCHES FOR
DRIVING MACHINES &c. and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
Our invention is applicable for driving machines or parts of machines, and stopping
the same and to effect the purpose we place inside the driving pulley which runs loose
upon the shaft two or more sectors. These sectors receive an expanding action from
levers actuated by toggle joints resting upon springs. The boss carrying the sectors,
springs, and levers being secured on the shaft. A loose slotted boss on the shaft when
moved the proper distance by the setting-on rod brings the toggle joint levers and
springs into an upright position, at right angles with the shaft, and pressing on the
levers gives an expanding motion to the sectors causing them to press with the
necessary force upon the inside of the driving pulley the shaft by the expanding
motion of the sectors becomes locked with the driving pulley and turns along with it
until liberated when it stops instantly. The levers, toggle joints, and springs are
carried by two bosses, one being secured to the shaft and the other a loose boss sliding
on the shaft.
In order to more fully explain the construction of our invention we attach hereto a
sheet of drawings. Fig. 1. shows sectional view of clutch and levers when not in
action. A being a shaft on which the pulley B runs loose, the driving belt or rope
acting upon its outside surface. The boss C is secured to the shaft A in any suitable
manner, and carries the two pistons DD, sectors E E, and levers F F. The short ends
of levers F F take into slots GG, in pistons D D, the levers F F have their fulcrum
in a box which may be adjusted by means of screws and secured to boss C. On the
long ends of levers F F, are toggle joints. H H with spiral springs K K secured in
position, and at the required tension by nuts L L on ends of toggles H H. The said
ends of toggles H H passes through its swivel fulcrum JJ, thus compressing the
springs and increasing the pressure on the sectors. The fulcrum being carried in
suitable bearings on sliding boss I which has an annular groove, and by which the
clutch may be operated. The boss I slides along a feather on the shaft Å to keep it
in its proper position relative to the boss C.
Fig. 2 shows position of clutch when in action. Clutch being in position shown in
Fig. 1. the sliding boss I is pressed into position as shown in Fig. 2. This causes the
springs K K to be compressed and exert their power on the long ends of levers F F,
causing the short ends of levers F F to expand the pistons D D and sectors E É
against the inside of the rim pulley B thus causing the two to revolve together. The

page_text: reverse action of the boss I draws in pistons D D, and sectors E E and liberates the
clutch.
Fig. 3. Shows position of toggles when springs K K are compressed.
Fig. 4. Shows sectors E E, and pistons D D when in action.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare that what we claim is :-
First: The toggle joints and springs whether two or more are used.
Second The toggle joints with springs and levers in combination substantially as
shown in drawings attached and described.
WILLIAM HENRY LATHAM.
FREDERIC CARTWRIGHT WARD LATHAM.