Im- PROVEMENTS IN CAPSTANS AND WINDLASSES
Year: 1874

page_text: LETTERS PATENT to William Horatio Harfield, of the Mansion
House Buildings, in the City of London, for the Invention of "Im-
PROVEMENTS IN CAPSTANS AND WINDLASSES."
Sealed the 3rd July 1874, and dated the 24th January 1874.
PROVISIONAL SPECIFICATION left by the said William Horatio
Harfield at the Office of the Commissioners of Patents, with his
Petition, on the 24th January 1874.
I, WILLIAM HORATIO HARFIELD, of the Mansion House Buildings,
5 in the City of London, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN CAPSTANS AND WINDLASSES," to be as
follows:-
In constructing windlasses I have been accustomed to drive the wind-
lass barrel through two pinions keyed on a countershaft, which gear into

page_text: two purchase wheels keyed to the windlass spindle. This countershaft
has a messenger chain wheel at one end, over which is passed one loop
of an endless messenger chain, the other loop passing over a correspond-
ing messenger wheel on a steam winch.
In some cases it is important that that in addition to driving the
windlass a capstan for warping generally on an upper deck should also be
driven. To accomplish this I place on the countershaft a bevel wheel
gearing into another bevel wheel on the vertical or capstan shaft. It will
be seen that by this arrangement the windlass barrels may be driven from
time to time as may be required whilst the warping capstan is being
driven, also that by placing bars in the head of the manual capstan the
windlass may be worked by hand when the steam is not available.
To prevent the backward movement of the windlass I place on the
purchase wheels two nipping lever pawls. These pawls will prevent any
strain coming on any of the teeth of wheels or pinions further than
what can be applied by the steam winch or by manual power.
In cases where it is necessary to reverse the windlass it can be done
either by applying reversing pinions as described in the Specification of
a former Patent granted to me, and dated the 15th day of February,
1872, No. 483, or by lifting the nipping lever pawls out of gear and
working the countershaft of windlass in the reverse direction either by
the steam winch or through the manual bars in the head of the warping
capstan.

page_text: driven, also that by placing bars in the head of the manual capstan the
windlass may be worked by hand when the steam is not available.
At Figures 1 and 2 are shewn respectively a side and end view of a
windlass with a capstan on an upper deck combined with it in the
manner above described. a is the windlass driven by pinions 6 on
countershaft c; d is a chain wheel upon this shaft to be driven by a
messenger chain from a steam winch as heretofore; e is a bevel wheel
on countershaft c gearing with a similar wheel on shaft f, which at its
lower end steps into a bearing on the top of standard g, whilst its upper
end rises up through the deck h and gives motion to the capstan barrel i,
which is above the deck.
To prevent the backward movement of the windlass I place on the
purchase wheels two nipping lever pawls. These pawls will prevent any
strain coming on any of the teeth of wheels or pinions further than
what can be applied by the steam winch or by manual power.
In cases where it is necessary to reverse the windlass it can be done
either by applying reversing pinions as described in the Specification of a
former Patent granted to me, and dated the 15th day of February,
1872, No. 483, or by lifting the nipping lever pawls out of gear. One
method of doing this is also shewn in the Drawing, in which a short a
shaft mounted in bearings 1, 1, has two cams fixed to it; the cams
are immediately below the nipping lever pawls, and are so arranged that
when the end of the lever k¹, which is fixed to the shaft carrying the
cams is pressed downwards, the cams or lifters come in contact with the
cheeks m of the nipping lever pawls and throw them upwards out of 1
gear with the purchase wheels, which can be revolved in the reverse
direction either by the reverse rotation of the counter shaft c or by
that of the capstan through the manual bars in head.
Having thus described the nature of my Invention, and the manner
of performing the same, I would have it understood that I claim,-
1st. The combination of windlass with capstan and countershaft as
nomihed

page_text: out of gear with the object of allowing the reverse rotation of the
shafts.
In witness whereof, I, the said William Horatio Harfield, have
hereunto set my hand and seal, this Twenty-second day of July,
in the year of our Lord One thousand eight hundred and seventy-
four.