Improvements in Self-sustaining Hoists and other Lifting Apparatus, applicable also to Friction Clutches, Pulleys, Couplings, and the like.
Year: 1898

page_text: Date of Application, 11th Jan., 1898
Complete Specification Left, 11th Oct., 1898-Accepted, 7th Jan.,
1899
Improvements in Self-sustaining Hoists and other Lifting Apparatus,
applicable also to Friction Clutches, Pulleys, Couplings, and the
like.
I, WILLIAM HENRY CRANSTONE, of 25, High Street, Hemel Hampstead, in the.
County of Hertford, Engineer, do hereby declare the nature of my said invention.
to be as follows:-
My invention relates to hoists and other lifting apparatus, friction clutches,
pulleys, couplings and the like, and its object is to effect improvements in the
method of applying the necessary friction thereto for the above purposes.
According to my invention, I make use of an open ended cylinder, truly bored
internally and cast on or otherwise connected with or forming part of the apparatus.
Inside this cylinder I fit a split ring, the external diameter of which is such that
the cylinder and ring are (normally) each capable of revolving independently of
the other.
The substance of the split ring is increased or enlarged inwardly at and about
the meeting faces of the split junction, and this enlargement is bored with a
circular hole in alignment with the axis. One end of a cylindrical bar or rod
is inserted in this hole, and the outer end of this rod is connected to a pulley or
disc or other suitable portion of the apparatus, in such a manner that when the
rod is in alignment with the axis the cylinder and ring are each free to
revolve independently; and, when the rod is caused to assume a diagonal position;
relatively to the line of axial motion, the ring becomes expanded in the cylinder,
and the cylinder and ring then mutually revolve or remain at rest, according
to the arrangement and purpose of the apparatus to which it is applied.
1000
GEORGE DOWNING & SONS,
S, Quality Court, London, W.C., Agents.
Improvements in Self-sustaining Hoists and other Lifting Apparatus,
applicable also to Friction Clutches, Pulleys, Couplings, and the
like.
I, WILLIAM HENRY CRANSTONE, of 25, High Street, Hemel Hempstead, in the
County of Hertford, Engineer, do hereby declare the nature of my said 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 relates to hoists and other lifting apparatus, friction clutches,

page_text: pulleys, couplings and the like, and its object is to effect improvements in the
method of applying the necessary friction thereto for the above purposes.
And in order that my said invention may be particularly described and
ascertained reference is hereby made to the accompanying drawings, in which
similar figures of reference indicate corresponding parts.
Fig. 1 is a sectional elevation illustrating the application of my invention to
a hoist.
Fig. 2 is a section of the fixed sustaining cylinder and loose split ring, on the
line of Fig. 1.
Fig. 3 is a horizontal section illustrating the action of the lugs in ordinary
driving or lifting.
Fig. 4 is a similar section showing a modification for working in one direction
only, one fixed arm being in advance of the other.
Fig. 5 shows the action of the lugs and bolt when the lifting pulley overtakes
the speed of the driving wheel, whereby the split ring is expanded.
3 is an open ended cylinder truly bored internally, and fixed to the apparatus
in any suitable manner. 4 is a split ring, the external diameter of which is
such that the ring is (when unexpanded) capable of revolving independently of
the cylinder. The substance of the split ring is increased or enlarged at 5, 5, as
shown, at and about the meeting faces of the split junction. This enlargement
is bored with a circular hole in alignment with the axis. is a cylindrical
bar or rod which is inserted in the hole between the meeting faces of the split
ring. The end 7 of the bar or rod 6 is barrel shaped and enters a hole. 8 formed
in the pulley 9. 10 is the hauling wheel of the apparatus, fast on the axle 11.
12 is a bearing. 13, 13, are two driving lugs fast on the axle and bored or
slotted to receive the bar or rod 6 in such a manner as to carry the bar in align-
ment with the axis and thereby drive the pulley 9 without expanding the split
ring, as shown in Figs. 3 and 4."
When, however, the lifting pulley 9 overtakes the speed of the driving wheel
and presses forward the end 7 of the bar 6, the latter is thereby caused to assume
a diagonal position relatively to the line of axial motion, as shown in Fig. 5.
The ring 4 thereby becomes expanded in the cylinder 3 and thus applies the
necessary brake power to the apparatus, as required.
In applying my invention to friction clutches, couplings and the like, the
functions of the bar or rod are modified accordingly, the cylinder or disc being
made integral with the revolving pulley so as to be driven by the bar when re-
volving in one direction, and to run free when revolving in an opposite direction;
my invention being obviously capable of being otherwise modified to adapt it
to analogous machinery or apparatus.
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:
―:
In self-sustaining hoists and other lifting apparatus, friction clutches, pulleys,
couplings, and the like, in which a split ring is caused to expand in a cylinder for
the purposes aforesaid, the application and use of a cylindrical bar or rod 6
having a barrel shaped end 7, the cylindrical portion 6 passing through the
enlarged split portion 5, of the ring 4 and being carried by lugs 13, the end 7
engaging in an opening in a pulley 9 or the like, substantially as described.
Dated 10th October 1898.
GEORGE DOWNING & SONS,
8, Quality Court, London, W.C., Agents.