An Improved Form of Rope Gripping Driving Pulley.
Year: 1892

page_text: Date of Application, 20th Sept., 1892
Complete Specification Left, 20th June, 1893-Accepted, 20th Sept., 1893
PROVISIONAL SPECIFICATION.
An Improved Form of Rope Gripping Driving Pulley.
GEOFFREY BARRETT, 15 Avenue Road, Regents Park London N.W. Electrical
Engineer, do hereby declare the nature of this invention to be as follows:
My invention is for improvements in rope gripping driving pulleys and consists
of a number of pairs of gripping jaws placed around the periphery of the pulley
wheel. These pairs of gripping jaws hinge in lugs forming parts of the periphery
of the wheel. Down the middle of each jaw is a web which fits easily into a
slot cut transversely in the pulley wheel. These webs take the driving strain
of the pulley rope.
The ends of these jaws extend towards the centre of the
pulley wheel, and are connected in pairs by springs. which draw the said ends
together, thus keeping open the gripping jaws until they are brought into contact
with the said rope, when they are closed by action of the said rope pressing
them inwards, and thus tightly gripping the said driving rope. By a projection
on the web of the said jaw which presses against the under side of the periphery,
the said jaws are prevented from leaving their positions due to the centrifugal
force. I make the jaws of steel iron or other suitable material but I prefer to
make them of mild steel formed first by the well known stamping process, and
afterwards finished to dimensions. The number, size, and proportions of these
pairs of gripping jaws placed around any pulley may vary with the amount of
power with which they have to deal.
Dated this Nineteenth day of September 1892.
COMPLETE SPECIFICATION.
An Improved Form of Rope Gripping Driving Pulley.
GEOFFREY BARRETT, 15 Avenue Road Regents Park London N.W. Electrical
Engineer 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 :-
My invention is for improvements in rope gripping driving pulleys, and consists
of a number of pairs of gripping jaws placed around the periphery of the pulley
wheel. These pairs of gripping jaws hinge in lugs forming parts of the periphery
of the pulley wheel.
Down the middle of each jaw is a web which fits easily into a slot cut
transversely in the pulley wheel. These webs take the driving strain of the
pulley rope.
The ends of these gripping levers extend towards the centre of the pulley wheel
& are connected in pairs by springs which draw the said ends together, thus
keeping open the gripping jaws until they are brought into contact with the said
driving rope when they are closed by action of the said rope pressing them inwards
& thus tightly gripping the said rope.
By a projection on the said gripping lever which presses against the under side
of the periphery, the said jaws are prevented from leaving their positions due to
centrifugal force. I make the jaws of steel, iron, or other suitable material but
I prefer to make them of mild steel formed by the well known stamping process.
And in order that my invention may be fully understood and readily carried into
operation, I will proceed to describe the accompanying sheet of drawings, reference
being made to the figures & letters marked thereon.

page_text: Fig. 1 is a transverse section through part of the periphery of the wheel, shewing
a pair of gripping levers.
Fig. 2 is an elevation of part of the periphery of the wheel showing a pair of
gripping levers.
a. is the rope. . are the gripping jaws which extend through d, h, m, as levers.
As soon as the rope a. enters the jaws bit forces them inwards towards the centre
of the wheel, the said jaws hinging, or pivoting in the lugs c, placed around the
circumference of the wheel, & taking up the position as indicated by the dotted
lines shewn in Figure 1, thus extending the spring 1.
h
As soon as the pressure from the said rope is released from the said jaws the
spring pulls them open & releases the rope. Should the jaws have become
displaced from their seating at the point d the gripping levers will hinge at the
point and will thereby restore the said jaws to their proper position. The pro-
jection h. on the said gripping levers also prevents the said levers from flying out,
owing to the centrifugal force, & thus bolds them down & keeps them in their place.
The webs e on the said levers work in transverse slots in the pulley & thus
take the driving strain of the rope & prevent the said levers from being carried
round with the rope. The number, size, & proportions of these pairs of gripping
levers, placed around any pulley may vary with the diameter of the wheel, the
size of the rope, & with the power to be transmitted.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
1. The improved construction of rim, as shewn, and for the purpose described.
2. The improved form and construction of the gripping levers as shewn and
described.
3. Forming webs on the gripping levers, as shewn, and described e, Fig. 1, for
taking the strain.
4. The projection on the gripping levers for keeping the said levers in the
proper position.
5. The improved combination of the arms of the gripping levers m. and the
spring 1. for keeping the gripping jaws open, as shewn and described.
Dated this Nineteenth day of June 1893.
ANARKOV TA DDRALA
BY BARR
ΟΙ ΤΣΤΑΤΑΙ ΤΙΣ
mmתתימ מגת
GEOFFRE