IMPROVEMENTS IN STOPPERS OR BREAKS FOR IRON AND STEEL WIRE ROPES, CABLES, OR HAWSERS
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by the said James Mitchell at the Office
of the Commissioners of Patents on the 23rd February 1880.
JAMES MITCHELL, of 48, Gordon Street, Glasgow, Engineer.
"IMPROVEMENTS
IN STOPPERS OR BREAKS FOR IRON AND STEEL WIRE ROPES, CABLES, OR
HAWSERS."
This Invention of improvements in stoppers or breaks for iron and steel wire
ropes, cables, or hawsers, relates to what is called the stopper for arresting the
paying out of such ropes or the holding them fast when required, and is based on
the principle of the nut and screw, the wire rope being considered as a screw of the
number of threads corresponding to the number of strands of the rope.
Tho nut is made of one or more parts with corresponding threads as in the rope,
and on the nut or surrounding its several parts is a break wheel or portion of a
break wheel. On each part or segment of the nut on the break wheel is a band
worked by a wheel and screw or lever; the nut and break wheel are carried in
suitable bearings.
The action is as follows:—
Release the break band and the nut opens and allows the rope to run; gently.
tighten the band and the nut will revolve in the bearings, checking the running
out of the rope at the speed required; make the band tight and it will hold
the rope firmly.. The parts of the nut and break wheel are not closely fitted, so
the pressure put on the break wheel by the band, not only (as in an ordinary
break) keeps the nut from revolving, but closes the segmental parts, compressing
the rope, thus preventing injury to the pitch of the screw which the strands of the
rope form.
"
All other apparatus works by compression only, such compression being obtained
by powerful screws or wedges which chafe and injure the rope, as they either more
or less allow the rope to be drawn through.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said James Mitchell in the Great Seal Patent Office on the 21st
August 1880.
JAMES MITCHELL, of 48, Gordon Street, Glasgow, Engineer.
"IMPROVEMENTS
IN STOPPERS OR BREAKS FOR İRON AND STEEL WIRE ROPE, CABLES, OR
HAWSERS."
Tliis Invention of improvements in stoppers or breaks for iron and steel wire
rope, cables, or hawsers relates to what is called the stopper for arresting the paying
out of such ropes or the holding them fast when required, and is based on the
principle of the nut and screw, the wire rope, which of course must be a round
rope, being considered as a screw of the number of threads corresponding or
approximating to the number of strands of the rope appearing on the outside
circumference of the rope. The nut is made of one or more parts with corresponding
threads as in the rope, or fluted to approximate thereto, and on the nut or
surrounding its several parts is a break wheel or portion of a break wheel. On
such part or segment of the nut on the break wheel is a band worked by a wheel
and screw or lever; the nut and break wheel are carried in suitable bearings. The
action is as follows:-Release the break band and the nut opens and allows the
rope to run; gently tighten the band and the nut will revolve in the bearings,
checking the running out of the rope at the speed required; make the band tight
and it will hold the rope firmly. The parts of the nut and break wheel are not
closely fitted, so the pressure put on the break wheel by the band, not only (as in
an ordinary break) keeps the nut from revolving, but closes the segmental parts,
compressing the rope, thus preventing injury to the pitch of the screw which the
strands of the rope form.
In the Drawings accompanying and forming part of this Specification, like letters
indicating like parts,
Figure 1 is an elevation of the apparatus with the rope in place.
Figure 2, plan of the apparatus.
Figure 3, end elevation of the apparatus.
Figure 4, one of the segments of the nut and breakwheel.
a, a, the segments of the nut and breakwheel; b, b, the friction band of the break
wheel actuated by the nuts c, c, and screw d turned by the handle e; f, frame of the
apparatus; g, the plummer blocks in which the segments a revolve; h, the
rope.
In the Drawings, Figure 4 shews at each end of the segment the brass bearings i
of the plummer block; these bearings are made solid to prevent the segments of
the nut opening too far when the break band is slackened and the nut revolving
in the plummer blocks, otherwise the nut might jam in the bearings.
Having now described and particularly set forth the nature of the said Invention,
and the manner of carrying the same into effect, I would have it understood that
what I claim is,-
A nut or sleeve in several parts controlled by a break band for stopping or
controlling iron and steel wire ropes, cables, or hawsers, substantially in the manner
and for the purposes set forth.
In witness whereof, I, the said James Mitchell, have hereunto set my hand
and seal, this Nineteenth day of August, in the year of our Lord One
thousand eight hundred and eighty.
TOTA
MAHELT