Year: 1886

page_text: Date of Application, 2nd Nov., 1886.
Complete Left, 28th July, 1887.
Complete Accepted, 30th Aug., 1887,
I, CHARLES HENRY MURRAY of the Elswick Works, Newcastle upon Tyne, Engineer
do hereby declare the nature of this invention to be as follows :-
In order to control more easily the lowering of a weight when lifted by rope and
pulley blocks, I make the sheaves of the upper block to be tightly squeezed in their
framing by a nut which acts on the axle of the sheaves, this axle being threaded for
the purpose. The nut is attached to or forms part of a lever or wheel to which a cord
or chain is fastened for working it.
The action is as follows:-
After the weight has been lifted by the combined power of several men,
the top
sheaves, which in their normal condition are free to revolve, can be jammed tightly
between their frames by pulling on the break cord. Then as the sheaves can no
longer revolve the weight can only lower by the ropes slipping on the top sheaves,
but this produces so much friction that one man with one hand can easily hold the
fall of the rope or lash it to any part of the tackle, or he can with one hand slack off
the fall of the rope and so lower the weight without fear of being overpowered by
the weight.
CARPMAEL & Co.,
Agents for the Applicant.

page_text: I, CHARLES HENRY MURRAY of the Elswick Works, Newcastle upon Tyne, 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:
In order to control more easily the lowering of a weight when lifted by rope and
pulley blocks, I make the sheaves of the upper block to be tightly squeezed in their
framing by a nut which acts on the axle of the sheaves, this axle being threaded for
the purpose. The nut is attached to or forms part of a lever or wheel to which a cord
or chain is fastened for working it.
The action is as follows :-
After the weight has been lifted by the combined power of several men, the top
sheaves which in their normal condition are free to revolve, can be jammed tightly
between their frames by pulling on the break cord. Then as the sheaves can no longer
revolve the weight can only lower by the ropes slipping on the top sheaves, but this
produces so much friction that one man with one hand can easily hold the fall of the
rope or lash it to any part of the tackle, or he can with one hand slack off the fall of
the rope and so lower the weight without fear of being overpowered by the weight.
In order that my said invention may be most fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.
Figure 1 is a front elevation partly in section of a pulley block constructed in
accordance with my invention.
Figure 2 is an end elevation of the same.
Figure 3 is a section on the line 1-1. in Figure 2.
A. A. A. A. are the sheaves they are mounted to turn upon the spindle B. The
spindle is carried by the side cheeks C. C. and these are connected and supported by
a bar D. D' is an eye on the bar D by which the block is suspended when in use.
The side cheeks Care passed over the ends of the bar D and are secured by nuts and
locking pins on these ends. The sheaves are also separated the one from the other by
plates E. E. E. The plates E.E. are also passed on to the bar D and they are kept in
place by distance rings D* D*. F. F. are two side bars which complete the frame;
they are provided at one end with heads, F serving as chain guides, as clearly shown
in Figure 3. The bars F pass through the side cheeks C. C. and the plates E. E. and
at their further ends they receive washers and pins which secure them in place.
The spindle B has a head at one end and adjacent upon the head a screw thread is
cut upon the enlarged part of the spindle. This thread receives upon it the chain
wheel G and the wheel works as a nut upon the thread, the spindle is unable to turn,
being square in form, in the part which passes through the cheek upon which the
wheel Gabuts. The spindle at its further end receives a nut and locking pin.

page_text: K is a hand chain passing around the chain wheel G. The chain guides F¹ confine
the chain to its place, as is clearly shown in Figure 3. When by pulling upon the
chain, the wheel G is turned the wheel traverses along the spindle and so the sheaves A.
the side cheeks C and separating plates E may be all pressed firmly together and the
sheaves locked. By the movement of the chain and the chain wheel in the opposite
direction the sheaves are at once liberated.
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 :-
1. A pulley block in which the sheaves can be squeezed tightly together by means
of a nut on the spindle and having appliances for turning the said nut to lock and
liberate the sheaves whilst the block is in use.
2. My improved pulley block substantially as described and illustrated in the
annexed drawings.