Year: 1886

page_text: I WILLIAM HORATIO HARFIELD of Mansion House Buildings, in 'the city of
London, Mechanical Engineer do hereby declare the nature of this invention to 'be
as follows:-
This invention has for its object improvements in steam and hand purchase for
windlasses whereby either 'the hand or the steam purchase or both, may be readily
connected or disconnected as required for working cables either in the same or
opposite directions.
For this purpose upon a horizontal shaft I fix centrally two hand purchase
wheels and 'towards the 'outer ends I mount loosely two toothed worm wheels
capable of being 'worked in either direction by any suitable 'means. Between each
hand purchase wheel and its worm wheel I also mount loosely upon the spindle
a barrel or cable holder capable of being connected either with the hand purchase
wheel'or the worm wheel or with both. I prefer to make the connection by means
of the compound frictional arrangement described in the Specification of a Patent
granted to me, No. 442 of 1867 but I do not limit myself to such design as there
are many other systems of clutches that will answer the purpose.
G. F. REDFERN,
4, South Street, Finsbury, London,
Agent for the Applicant.

page_text: I WILLIAM HORATIO HARFIELD, of Mansion House Buildings, in the city of
London, Mechanical 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 :-
This invention has for its object improvements in steam and hand purchase for
windlasses whereby either the hand or the steam purchase or both may be readily
connected or disconnected as required for working cables either in the same or
opposite directions.
For this purpose upon a horizontal shaft I fix centrally two hand purchase
wheels and towards the outer ends I mount loosely two toothed worm wheels
Between each
capable of being worked in either direction by any suitable means.
hand purchase wheel and its worm wheel I also mount loosely upon the spindle a
barrel or cable holder capable of being connected either with the hand purchase
wheel or the worm wheel or with both.
In order to enable my invention to be fully understood I will proceed to describe the
same by reference to the accompanying drawings in which figure 1 (sheet 1) is a half
plan of a windlass constructed according to my invention and figure 2 (sheet 2) is a
horizontal section of the other half of the windlass. Similar letters in both figures
represent similar parts.
a, is the horizontal shaft and b, b, are the two hand purchase wheels fixed
upon it centrally. These purchase wheels can be rotated by means of the
two frictional nipping pawls c, c, worked by manual levers d, d, in the usual
manner e, e, are the two toothed worm wheels mounted loosely upon the main
shaft a. Two worms f, f, gear into the said worm wheels e, e, and these worms can be
driven in either direction independently by any suitable motive power. g. g, are
the barrels, cable holders or drums working the chain or rope; these drums are
Each end of the barrels or drums is
also mounted loosely upon the main shaft a.
fitted with a compound frictional clutch h, arranged so that the barrel may be
frictionally connected with the purchase wheel only when working the windlass
by hand or with the worm wheel only when working the windlass by worm
gearing. In this latter case the barrel and worm wheel revolve round the shaft
and the shaft itself may either revolve or remain stationary. When riding or
" bolding on " both the brakes are in action and thus the torsional strain is entirely
taken from the spindle.
I prefer to make these_connectors and brakes in the manner described in the
Specifications of former Patents granted to me No. 442 of 1867 and No. 910 of
1875 but I do not limit myself to such design as there are other systems of
clutches that will answer the purpose.
When it is necessary to haul the chain in upon one barrel and to veer upon the
other the barrels must be connected to their respective worm wheels and the
reverse motion given by the worms.
A convenient way of giving the reverse motion to the worm wheels is by
the use of the double clutch described in a Patent granted to me No. 1298
100K

page_text: 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 windlass provided with two sets of brakes and connectors to each barrel or
chain holder substantially as described.
2. The combination of hand purchase gear with a windlass having double
brakes and connectors substantially as described.
3. The improved windlass hereinbefore described and represented in the accom-
panying drawings.