IMPROVEMENTS IN OR CONNECTED WITH PULLEY BLOCKS
Year: 1881

page_text: LETTERS PATENT to Rowland Priest, of Cradley Hetah, in the County. of
Stafford, Pulley Block and Chain Manufacturer, for an
Invention of
PROVISIONAL SPECIFICATION left by the said Rowland Priest at the Office
of the Commissioners of Patents on the 23rd July 1881.
.
ROWLAND PRIEST, of Cradley Heath, in the County of Stafford, Pulley Block
and Chain Manufacturer. IMPROVEMENTS IN OR CONNECTED WITH PULLEY
BLOCKS."
"
The object of this Invention, which relates to certain improvements in or
connected with pulley-blocks, is to prevent the pulling loop of the chain of such
pulley-blocks from being disengaged from the teeth and grooves of the pulley, and.
to cause the certain engagement thereof at all times when in regular use.
I am aware of the arrangement described in the Specification of the Letters
Patent granted to George Tangye, and bearing date the 8th day of August A.D.,
1878, No. 3141, wherein guide tubes are used for the above mentioned object, but
those guide tubes are but a partial remedy for the inconvenience sought to be
obviated; and as (being tubes) they necessarily have fixed interior surfaces in
contact with a lineal length of which the chains have to glide, the loose loop of the
chain is liable to catch therein and to get out of place, preventing the free working
of the apparatus.
Now according to my Invention I substitute for each of the said tubes two small
grooved wheels or runners or rollers, which when the chain is passing between
then freely turn around their respective centres. The grooving or shaping of the
wheels, runners, or rollers and their spacing apart is such as to agree with the con-
formation and size of the chain, allowing a free traverse of the latter. The .centre
pins of the wheels, runners, or rollers are fixed in position by two plates constituting
a skeleton frame, and from one of which they project, the other or outer plate being
secured by nuts.
The frame can freely turn about in a vertical direction, and for this purpose its
inner plate is centred or pivotted to a depending arm which can freely swing, being
loosely hung on the usual axis of the pulley-block.
There being thus a freedom of movement of every part there is no possibility of
the chain sticking or being caught in its course, and the said inconvenience is thus
wholly remedied.

page_text: the
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Rowland Priest in the Great Seal Patent Office on
19th January 1882.
ROWLAND PRIEST, of Cradley Heath, in the County of Stafford, Pulley Block
and Chain Manufacturer. "IMPROVEMENTS IN OR CONNECTED WITH PULLEY-
BLOCKS."
The object of this Invention, which relates to certain improvements in or
connected with pulley-blocks, is to prevent the pulling-loop of the chain of such
pulley-blocks from being disengaged from the teeth and grooves of the pulley, and
to cause the certain engagement thereof at all times when in regular use.
I am aware of the arrangement described in the Specification of the Letters
Patent, No. 314178, granted to George Tangye, and bearing date the 8th day of
August A.D., 1878, wherein guide-tubes are used for the above mentioned object;
but such guide-tubes are but a partial remedy for the inconvenience sought to be
avoided, as (being tubes) they necessarily have fixed interior surfaces in contact
with a lineal length of which the chains have to glide, and the loose loop of the
chain is liable to catch therein and to get out of place, preventing the free working
of the apparatus.
Now according to my Invention, which is illustrated on the accompanying
Drawings in Figs. 1 and 2, I substitute for each of the said tubes as used by the said
George Tangye, two sinall grooved wheels, runners, or rollers 1, which, when the
chain is passing between them, freely turn around their respective centre-pins 2,
The grooving or shaping of the wheels, runners, or rollers, and their spacing apart,
are such as to agree with the conformation and size of the chain, allowing a free
traverse of the latter. The centre-pins 2 project from a plate 3, and the runners 1
are secured on the outer side by a plate 4, and by nuts 5, the plates 3 and 4
constituting a skeleton frame.
The frame 3, 4, can freely turn about in a vertical direction, and for this purpose
its inner plate 3 is centred or pivoted to a depending arm 6, which can freely swing,
being loosely hung on the usual axis 7 of the pulley-block.
There being thus a freedom of movement of every part, there is no possibility-of
the chain, which passes between the pulleys 1, sticking or being caught in its course,
and the said inconvenience is thus wholly remedied.
Having now described the nature and object of my said Invention, together with
the manner in which the same is to be or may be performed or carried into practical
effect, I would remark in conclusion that what I claim as the improvements
.constituting the Invention secured to me by the hereinbefore in part recited Letters
Patent is,-
The combination with pulley-blocks of freely turning wheels, runners, or rollers,
correspondingly turned or conformed and spaced apart to the form of the chain of the
pulley-block, and carried or supported with the required freedom of movement,
substantially as and for the purposes, and to completely overcome the disadvantages
herein before described and referred to.
In witness whereof, I, the said Rowland Priest, have hereunto set my hand
and seal, this Eighteenth day of January, in the year of our Lord One
L
dnight hundred and nighty two