IMPROVEMENTS IN DIFFERENTIAL PULLEYS OR PULLEY BLOCKS
Year: 1884

page_text: GEORGE BILLINGHAM of Milnrow Road Rochdale (Lancaster) Chain Maker do
hereby declare the nature of my invention for IMPROVEMENTS IN DIFFERENTIAL
PULLEYS OR PULLEY BLOCKS to be as follows:-
My invention has reference to differential pulleys, or pulley blocks, known to the
trade, as Weston's differential pulley blocks, but my invention will apply equally
well to pulley blocks in general. The object of my invention is to stop the loose
loop of the chain from being displaced from the teeth and grooves of the pulley by
accident or carelessness, as well as to determine the certain engagement of the chain
with the teeth and grooves of the pulley. When the chain is jerked or twisted it
does not act at once with the teeth of the pulleys, and this fault is remedied by my
invention.
My invention consists in the employment of Bent Arm Loop Slot Guides through
which the loose or pulling loop of the chain passes.
One of these Bent Arm Loop
Slot Guides is suspended by means of a screw pin or stud from the base end of the
triangle formed by the suspended frame, one on the one side of the base end of the
triangle formed by the suspended frame, and one from the other base end of
the triangle formed by the suspended frame, and when in their normal position's
lang perpendicularly with the loose loops or pulling chains.
As this loop of the chain is the only loop of two loops of the chains of the
differential pulleys with which my invention is concerned I do not think it
necessary to refer to the other loop in which the snatch block is.
The aforesaid bent arm loop slot guides are fixed fast together so that the loop.
slot guides do not swivel on the arm, but the loop slot guide is fixed or rivetted
fast on the arm.
The arm of the aforesaid Bent Arm Loop Slot Guide moves backwards and
forwards as the loose loop or pulling chain is moved from a perpendicular position,
so that the loose loop or pulling chain passes through the loop slot guides without
friction.
I prefer to give the Loop Slot Guides, the same internal sectional figure as that
of the chain with a slot through the sectional figure so that the chain in passing
through the loop slot guides to or from the pulley has the twist taken out. The
chain can be taken out temporarily from the Loop Slot Guides when they are in

page_text: their working position by passing one link end-ways of the loose loop or pulling
chain through the aforesaid slot in the loop slot guide, when it is in its normal
position.
The chain is not cottered or fixed with bolt, in order to prevent it from coming
through the aforesaid slot in the loop slot guides.
My invention of Bent arm Loop Slot Guides is such that they can be fixed to all
kinds of chain pulley blocks besides the differential pulley blocks by a screw pin
or stud. (as aforesaid) on the base end of the triangle formed by the suspended
frame, so that the twist is taken out of the chain, and the chain is regulated and
guided on the wheel by the Bent Arm Loop Slot Guides.
Dated this Fifteenth day of December one thousand eight hundred and eighty

page_text: GEORGE BILLINGHAM Chain maker, of Milnrow Road, Rochdale, in the county of
Lancaster do hereby declare the nature of my invention for "IMPROVEMENTS IN
DIFFERENTIAL PULLEYS OR PULLEY BLOCKS" and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:
My invention has reference to Differential Pulleys or Pulley Blocks known to
the trade as Weston's Differential Pulley blocks, but my invention will apply
equally well to Pulley Blocks in general.
The object of my invention is to stop the loose loop of the chain from being
displaced from the teeth and grooves of the pulley by accident or carlessness as
well as to determine the certain engagement of the chain with the teeth and
grooves of the pulley. When the chain is jerked or twisted it does not act at once
with the teeth of the pulleys and this fault is remedied by my invention.
My invention consists in the employment of Bent Arm Loop Slot Guides,
through which the loose or pulling Loop of the chain passes.
One of these Bent Arm Loop Slot Guides is suspended by means of a screw pin
or stud from the base end of the triangle formed by the suspended frame, one on
the one side of the base end of the triangle formed by the suspended frame, and
one from the other base. end of the triangle formed by the suspended frame,
and when in their normal positions hang perpendicularly with the loose loops or
pulling chains.
As this loop of the chain is the only loop of two loops. of the chains of the
differential pulleys with which my invention is concerned I do not think it
necessary to refer to the other loop in which the snatch block is.
The aforesaid Bent Arm Loop Slot Guides are fixed fast together so that the
Loop Slot Guides do not swivel on the arm, but the Loop Slot Guide is fixed or
rivetted fast on the arm. The arm of the aforesaid Bent Arm Loop Slot Guide
moves backwards and forwards as the loose loop or pulling chain is moved from a
perpendicular position so that the loose loop or pulling chain passes through the
Loop Slot Guides without friction.
I prefer to give the Loop Slot Guide, the same internal sectional figure as that of
the chain, with a slot through the sectional figure, so that the chain in passing
through the Loop Slot Guides to or from the pulley has the twist taken out of the
chain, and can be taken out temporarily from the Loop Slot Guides when they are
in their working position, by passing one link end ways of the loose loop or
pulling chain through the aforesaid slot in the Loop Slot Guide, when it is in its
normal position.
The chain is not cottered or fixed with bolt in order to prevent it from coming
through the aforesaid Slot in the Loop Slot Guides.
My invention of Bent Arm Loop Slot Guides is such that they can be fixed to all
kinds of chain pulley blocks besides the differential pulley blocks, by a screw pin
or stud, as aforesaid, on the base end of the triangle formed by the suspended
frame by which the twist is taken out of the chain, and the chain is regulated and
guided on the wheel by.the Bent Arm Loop Slot Guides.
I will now proceed to describe with reference to the accompanying Drawing, the
manner in which my invention may be performed.

page_text: •
Figure one represents in side elevation, and Figure two in front elevation a
differential pulley Block of the kind known, as Weston's differential pulley block,
the said pulley block being provided with my invention.
Figure 4 represents in plan one of the guides constructed according to my
Invention.
The same letters of reference indicate the same parts in Figures 1. 2 and 3.
a, a, a, represent the differential pulleys of the pulley blocks constructed in the
ordinary way and turning on the axis b, carried by the suspended frame cas
usual.
dande represent the two sides of the loose or pulling loop of the chain.
hand i are the Loop Slot Guides through which the loose or pulling loop de of
the chain passes. These Loop Slot Guides have the same internal sectional figure
as the chain as seen in Figure 2 so that the chain in passing through it in one or
other direction is prevented from being twisted.
Each of the Loop Slot Guides his carried on the lower end of Bent arm or
plate. The arm or plate swivels or moves backwards or forwards as the loose loop
or pulling loop of the chain is moved from a perpendicular position. The Bent
Arm Loop Slot Guides when in their normal position are perpendicular and are
moved backwards or forwards as the loose loop or pulling loop of the chain is
moved from a perpendicular position as shown in Figure 2.
Figure 3 is a side view of the suspended frame c. c c from which my invention
can be put at the base end and front end of base end of arm as shown in M and N
one on either end. Although I have only represented my invention as being on
the base end or front end of base end, yet it is equally applicable from any position
of the Suspended Frame, so that the Bent Arm Loop Slot Guide hangs in the same
'perpendicular position with the loose loop or pulling loop of the chain, and is
equally applicable to all kinds of Chain Blocks when the Bent Arm Loop Slot
Guide hangs in a perpendicular position with the pulling loop or loose loop of the
chain.
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
I claim is
Improvements in Differential Pulleys or Pulley Blocks herein before described
and illustrated in the accompanying drawing, that is to say the addition to or
combination with differential pulleys or pulley blocks of Loop Slot Guides through
which the loose loop or pulling loop of the chain passes, the said Loop Slot Guides
being carried by a bent arm or plate so as to hang perpendicularly with the loose
loop or pulling loop of the chain, one on either side of the suspended frame being
suspended by a pin or stud so as to move backwards and forwards as the loose
loop or pulling loop of the chain is moved from a perpendicular position of the
differential pulleys, the said Bent Arm Loop. Slot Guides being constructed,
arranged and working substantially as and for the purposes described and
illustrated.
In witness whereof I, the said George Billingham have hereunto set my hand
and seal the sixteenth day of September in the year of our Lord one