AN IMPROVED PULLEY BLOCK
Year: 1884

page_text: JAMES SWALWELL of Acre Street Battersea in the County of Surrey Engineer
and JOHN MOORE of South Stockton on Tees in the County of York Engineer do
hereby declare the nature of Our invention for AN IMPROVED PULLEY BLOCK
to be as follows:-
Our invention relates to Hoists of that class which have Sheaves of different
diameters and consists of making the same self-sustaining.
In a suitable frame is carried a central pin, on this pin is mounted an eccentric
and on the eccentric are formed teeth or projections which gear into a quadrant,
this quadrant carries two small rollers. On the eccentric is mounted (free to turn)
two sheaves of different diameter, one of which is the hand wheel and the other
the burden wheel We also swing a brake from the cross head in the frame.
When preparing the hoist for lifting, an endless hand chain is passed over the
large sheave. The lifting chain is passed over the small sheave and the ends are
passed between the two small rollers on the quadrant. In lifting the hand chain
is pulled. When the load is suspended and the motive power ceases to be applied
a certain amount of pressure is put on the quadrant through the roller by the
lifting chain. The quadrant then moves on its centre and actuates the eccentric
through the teeth or projections and causes the eccentric to throw the large sheave
up to the brake with sufficient force to sustain the load.
On again applying the lifting power the large sheave is drawn from the brake
which allows it to work freely. It will thus be seen that as one end of the lifting
chain ascends with its load the other descends ready to lift from the opposite side.
The lowering is effected by pulling the hand chain in the opposite direction or by
pulling a cord which may be attached to the quadrant.
The power may be increased by attaching either of the ends of the lifting
chain to the frame and placing a snatch block in the loop thus formed. The
self-sustaining and lowering action will be the same with the double lifting chain
as that described for the single one.
We have described and shown our invention as lifting the sheave up to the
brake to apply the friction to sustain the load but we sometimes adopt a modifica-
tion in which the brake is moved to the sheave and released through a lever by
the pull on the hand chain or rope.

page_text: DESCRIPTION OF DRAWINGS. Fig 1 is a front elevation and Fig 2 is a vertical
section.
a is the frame.
b
0
e
f
-
-
-
-
-
-
-
-
-
-
-
-
central pin.
eccentric.
projections or teeth.
quadrant.
rollers.
hand chain wheel.
burden wheel.
- brake..

page_text: JAMES SWALWELL, of Acre Street, Battersen, in the county of Surrey, Engineer,
and JOHN MOORE of South Stockton-on-Tees, in the county of York, Engineer do
hereby declare the nature of our invention for AN IMPROVED PULLEY BLOCK, and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
Our invention relates to hoists of that class which have sheaves of different
diameters and is also applicable to hoists consisting of one sheave only.
Figs 1 & 2. In a suitable frame is carried a central pin, and on this pin is
mounted an eccentric and on the eccentric are formed teeth or projections which
gear into a quadrant, this quadrant carries two small rollers near the centre and
also on the end of the arms.
On the eccentric is mounted (free to turn) two sheaves of different diameter one
of which is the hand wheel and the other the burden wheel.
Figs 3 & 4 are the same as Figs 1 & 2 except that the arm and quadrant are
above the central pin, and the two small rollers which guide the burden chain
are placed on fixed centres on the frame instead of on the quadrant.
When preparing the hoists for lifting an endless hand chain is passed over the
large sheave, the lifting chain is passed over the small sheave and the ends are
passed between the two small rollers on the quadrant in Figs 1 & 2 and on the
frame in Figs 3 & 4.
In preparing a single sheave for lifting the chain or rope is passed over the
sheave and between the two small rollers on the end of the arm, either plan Figs 1
& 2 or 3 & 4 may be adopted. In this case the two small rollers near centre and
the lifting barrel are not required, the other parts are the same as in Figs 1 & 2.
3 & 4.
In lifting, the band chain is pulled, when the load is suspended and the motive
power ceases to be applied a certain amount of pressure is put on the quadrant
through the rollers by the lifting chain. This tends to keep the machine in a
vertical position.
In Figs 1 & 2 the quadrant then moves on its centre and actuates the eccentric
through the teeth or projections and causes the eccentric to throw the sheave up to
the brake with sufficient pressure to sustain the load.
In Figs 3 & 4 the eccentric is turned on the pin by the tendency of the load to
run down and carries the sheave up to the brake as in Figs 1 & 2.
On again
applying the lifting power the sheave is drawn clear of the brake which allows it
to work freely.
The lowering is effected by reversing the direction of the motive power, or
pulling a cord which may be attached to the quadrant.
Or they can be lowered hand over hand at the lifting side by applying sufficient
tension on the rope or chain to relieve the brake through the roller on the end of
the arm as shown.
The power may be increased by attaching either of the ends of the lifting chain
to the frame and placing a snatch block in the loop thus formed, or still further
increased by additional sheaves.
The self-sustaining and lowering action will be the same with the double or
compound lifting chain as that described for the single one.
We have described and shown our invention as lifting the sheave up to the brake
to apply the friction to sustain the load, but we sometimes adopt a modification in
which the brake is moved to the sheave through a lever by the lifting chain,

page_text: through a lever by the lifting chain, and releasing the same through a lover by the
pull on the band chain.
DESCRIPTION OF DRAWINGS.
a is the frame.
b
C
f
h
-
central pin.
-
eccentric.
-
-
-
-
projections or teeth.
arm.
rollers.
hand chain wheel.
burden wheel.
brake.
Having now particularly described our invention and the manner in which it is
to be performed we have to state that what we claim is :—
1st mounting a sheave or sheaves on an eccentric, or its equivalent, in com-
bination with a brake or brakes and an arm substantially as described and
illustrated.
2nd moving a brake or brakes to a sheave or sheaves through a lever and an
eccentric by the pressure of the lifting chain, and releasing the same through
an arm by every pull on the hand chain substantially as described.
Dated this 11th day of December 1884.
JAMES SWALWELL.
JOHN MOORE.

page_text: JAMES SWALWELL of Acre Street Battersea in the County of Surrey Engineer
and JOHN MOORE of South Stockton on Tees in the County of York Engineer do
hereby declare the nature of Our invention for AN IMPROVED PULLEY BLOCK
to be as follows:-
:-
Our invention relates to Hoists of that class which have Sheaves of different
diameters and consists of making the same self-sustaining.
In a suitable frame is carried a central pin, on this pin is mounted an eccentric
and on the eccentric are formed teeth or projections which gear into a quadrant,
this quadrant carries two small rollers. On the eccentric is mounted (free to turn)
two sheaves of different diameter, one of which is the hand wheel and the other
the burden wheel We also swing a brake from the cross head in the frame.
When preparing the hoist for lifting, an endless hand chain is passed over the
large sheave. The lifting chain is passed over the small sheave and the ends are
passed between the two small rollers on the quadrant. In lifting the hand chain
is pulled. When the load is suspended and the motive power ceases to be applied
a certain amount of pressure is put on the quadrant through the roller by the
lifting chain. The quadrant then moves on its centre and actuates the eccentric
through the teeth or projections and causes the eccentric to throw the large sheave
up to the brake with sufficient force to sustain the load.
On again applying the lifting power the large sheave is drawn from the brake
which allows it to work freely. It will thus be seen that as one end of the lifting
chain ascends with its load the other descends ready to lift from the opposite side.
The lowering is effected by pulling the hand chain in the opposite direction or by
pulling a cord which may be attached to the quadrant.
The power may be increased by attaching either of the ends of the lifting
chain to the frame and placing a snatch block in the loop thus formed. The
self-sustaining and lowering action will be the same with the double lifting chain
as that described for the single one.
We have described and shown our invention as lifting the sheave up to the
brake to apply the friction to sustain the load but we sometimes adopt a modifica-
tion in which the brake is moved to the sheave and released through a lever by
the pull on the hand chain or rope.

page_text: DESCRIPTION OF DRAWINGS.
section.
Fig 1 is a front elevation and Fig 2 is a vertical
a is the frame.
b
o
d
el
-
-
-
central pin.
-
eccentric.
-
-
projections or teeth.
quadrant.
rollera.
hand chain wheel.
burden wheel.
-
brake.

page_text: JAMES SWALWELL, of Acre Street, Battersea, in the county of Surrey, Engineer,
and JOHN MOORE of South Stockton-on-Tees, in the county of York, Engineer do
hereby declare the nature of our invention for AN IMPROVED PULLEY BLOCK, and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
Our invention relates to hoists of that class which have sheaves of different
diameters and is also applicable to hoists consisting of one sheave only.
Figs 1 & 2. In a suitable frame is carried a central pin, and on this pin is
mounted an eccentric and on the eccentric are formed teeth or projections which
gear into a quadrant, this quadrant carries two small rollers near the centre and
also on the end of the arms.
On the eccentric is mounted (free to turn) two sheaves of different diameter one
of which is the hand wheel and the other the burden wheel.
Figa 3 & 4 are the same as Figs 1 & 2 except that the arm and quadrant are
above the central pin, and the two small rollers which guide the burden chain
are placed on fixed centres on the frame instead of on the quadrant.
When preparing the hoists for lifting an endless hand chain is passed over the
large sheave, the lifting chain is passed over the small sheave and the ends are
passed between the two small rollers on the quadrant in Figs 1 & 2 and on the
frame in Figs 3 & 4.
In preparing a single sheave for lifting the chain or rope is passed over the
sheave and between the two small rollers on the end of the arm, either plan Figs 1
& 2 or 3 & 4 may be adopted. In this case the two small rollers near centre and
the lifting barrel are not required, the other parts are the same as in Figs 1 & 2.
3 & 4.
In lifting, the hand chain is pulled, when the load is suspended and the motive
power ceases to be applied a certain amount of pressure is put on the quadrant
through the rollers by the lifting chain. This tends to keep the machine in a
vertical position.
In Figs 1 & 2 the quadrant then moves on its centre and actuates the eccentric
through the teeth or projections and causes the eccentric to throw the sheave up to
the brake with sufficient pressure to sustain the load.
In Figs 3 & 4 the eccentric is turned on the pin by the tendency of the load to
run down and carries the sheave up to the brake as in Figs 1 & 2. On again
applying the lifting power the sheave is drawn clear of the brake which allows it
to work freely.
The lowering is effected by reversing the direction of the motive power, or
pulling a cord which may be attached to the quadrant.
Or they can be lowered hand over hand at the lifting side by applying sufficient
tension on the rope or chain to relieve the brake through the roller on the end of
the arm as shown.
The power may be increased by attaching either of the ends of the lifting chain
to the frame and placing a snatch block in the loop thus formed, or still further
increased by additional sheaves.
The self-sustaining and lowering action will be the same with the double or
compound lifting chain as that described for the single one.
We have described and shown our invention as lifting the sheave up to the brake
to apply the friction to sustain the load, but we sometimes adopt a modification in
which the brake is moved to the sheave through a lever by the lifting chain,

page_text: By mounting it on an eccentric, and moving the eccentric to apply the friction
through a lever by the lifting chain and releasing the game through a lever by the
pull on the hand chain,
pull on the hand chain,
DESCRIPTION OF DRAWINGS.
a is the frame.
b
C
d
el
f
g
h
-
-
-
-
-
-
-
-
1
-
-
central pin.
eccentric.
projections or teeth.
arm.
rollers.
hand chain wheel.
burden wheel.
brake.
Having now particularly described our invention and the manner in which it is
to be performed we have to state that what we claim is :—
1st mounting a sheave or sheaves on an eccentric, or its equivalent, in com-
bination with a brake or brakes and an arm substantially as described and
illustrated.
2nd moving a brake or brakes to a sheave or sheaves through a lever and an
eccentric by the pressure of the lifting chain, and releasing the same through
an arm by every pull on the hand chain substantially as described.
Dated this 11th day of December 1884.
JAMES SWALWELL.
JOHN MOORE.