Improvements in Hydraulic Capstan Barrels.
Year: 1891

page_text: Date of Application, 17th Sept., 1891
Complete Specification Left, 16th June, 1892-Accepted, 23rd July, 1892
PROVISIONAL SPECIFICATION.
Improvements in Hydraulic Capstan Barrels.
1, WILLIAM JOHN NASH of 48 Johnson Street, St. Georges in the East
Engineer do hereby declare the nature of this invention to be as follows:-
My invention consists of a new method of expanding the barrel of an hydraulic
capstan by having three lugs, thus increasing the circumference, or reducing it to
its original circumference at will and this is done instantly simply by moving a
lever.
Dated this 17th day of Sentember 1801
COMPLETE SPECIFICATION.
Improvements in Hydraulio Capstan Barrels.
WILLIAM JOHN NASH 48 Johnson Street, St. Georges in the East, in the
County of Middlesex 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 improved capstan barrel consists of an expanding barrel with three or more
moveable whelps actuated either by hand lever, or selfacting springs. In the first case
a sleeve of cast iron is placed over the upright spindle (being a working fit) the
sleeve has three lugs or cranks at the top, these are placed radially and make equal
angles with one another. There are also three cranks at the bottom of the sleeve,
arranged in a similar manner. The top and bottom cranks are plumb and each
pair of cranks is connected by connecting rods to moveable whelps. On top of
sleeve passing to outside of barrel the hand lever is fixed with hinged handle.
By moving this lever to other end of slot the cranks are thrown on dead centres
and force out the whelps thus increasing the circumference. By bringing the lever
back the whelps are drawn in reducing the barrel to its original circumference.
the second case the moveable whelps are actuated by selfacting springs.
In
When no load is on the barrel it stands expanded, but when the load goes on, the
barrel begins to contract until the maximum load overcomes resistance of springs.
The levers with their fulcrums connected to rings keyed on to upright spindle have
slotted holes at their end. The connecting rod from spring encases these ends a
single pin passing through them, their sole purpose being to keep the whelps
parallel to upright spindle. The whelps in both cases work freely between guides.
By constructing capstan barrels on the above principle having varying circum-
ferences, time will be saved in hauling in slack rope, light crafts, light trains, or
any light load. Fewer turns will be required as the rope will have a better grip.
Also less of the water by which the engines are actuated will be used. The smaller
circumference is thus retained for maximum load.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings hereunto annexed.
Figure 1. is an elevation with whelps expanded.
Figure 2. is a half plan with whelps contracted also with top part removed.
Figure 3. is a sectional elevation with top part removed and with whelps
contracted.
Figure 4. is a plan with half of cover removed with whelps expanded.
Figure 5. is a sectional plan across z. y. with whelps contracted.
Figure 6. is a half plan looking upwards with whelps expanded.
a. are the

page_text: *moveable whelps. b, connecting rods. c, cranks. d, sleeve. e upright spindle.
band lever. and f² are the slots for lever when the barrel is either expanded
⚫ or contracted.
Figure 7 and 8 is a plan and part elèvation to a larger scale showing how hand
.lever is fixed.
Figure 9. is a sectional elevation to a larger scale with whelps expanded showing
four whelps while only three were shown on the other drawings. a are the move-
able whelps. g parallel levers. h the rings. selfacting springs by which the
whelps are actuated.
Having now particularly described and 'ascertained the nature of my said inven-
tior, and in what manner the same is to be performed, I declare that what i
--claim is―
First. My improved expanding capstan barrel actuated either by hand lever or
self acting springs.
Second. The internal mechanism for working same.
Third. The expanding capstan barrel complete as represented by annexed
drawings.
Dated this 14th day of Tu 1900
WILLIAM JOHN NASH.