Improvements in the Brake Mechanism for Windlasses and other Machinery.
Year: 1895

page_text: Date of Application, 10th Sept., 1895
Complete Specification Left, 10th June, 1896-Accepted, 18th July, 1896
PROVISIONAL SPECIFICATION.
Improvements in the Brake Mechanism for Windlasses and other
Machinery.
I, WILLIAM HORATIO HARFIELD, of Mansion House Buildings, Queen
Victoria Street, in the City of London, Engineer, do hereby declare the nature
of this invention to be as follows:-
My invention relates to improved brake mechanism for use in connection with
windlasses and other machinery.
In carrying out the said invention I make use of a nipping-lever or pawl similar
to that used for pawling and rotating windlasses as described in the Specification
of a Patent granted to me 23rd August 1872, No. 2512.
:
This lever is kept to its work on the wheel or barrel to be controlled by two side
plates which clip its rim and a pressure plate of considerable surface is interposed
between the outer face of the wheel and the inner end or nose of the lever in order
to diminish the wear.
In conjunction with the inner end of the lever I arrange a strut or stop upon
which the said lever can rest. When the outer end of the said lever is raised it
acts as an ordinary nipping pawl and prevents any backward action of the barrel
or wheel to which it is attached, but when the outer end is gradually lowered the
nipping action ceases and the checking or brake action comes into force as soon as
the inner end touches the strut.
Various means may be employed for raising and lowering the outer end of the
lever, but in practice I find it advantageous to form a curved incline on its under
side and allow it to rest upon a roller carried by a rocking bar having its centre at
one side of the centre of the curve of the lever (thereby giving an eccentric
motion) and enabling the roller not only to increase or diminish the nipping action,
as it is moved towards or away from the end of the lever, but also to raise or lower
the lever from or on to the strut.
Dated the 10th day of September 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in the Brake Mechanism for Windlasses and other
Machinery.
I, WILLIAM HORATIO HARFIELD, formerly of Mansion House Buildings,
Queen Victoria Street, in the City of London, now of Arundel House, Thames
Embankment, in the County of London, 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 invention relates to improved brake mechanism for use in connection with
windlasses and other machinery.

page_text: In carrying out the said invention I make use of a nipping-lever or pawl similar
to that used for pawling and rotating windlasses as described in the Specification
of a Patent granted to me 23rd August 1872, No. 2512.
This lever is kept to its work on the wheel or barrel to be controlled by two
side plates which clip its rim and a pressure plate of considerable surface is
interposed between the outer face of the wheel and the inner end or nose of the
lever in order to diminish the wear.
In conjunction with the inner end of the lever I arrange a strut or stop upon
which the said lever can rest. When the outer end of the said lever is raised it
acts as an ordinary nipping-pawl and prevents any backward action of the barrel
or wheel to which it is attached, but when the outer end is gradually lowered so
that the inner end touches the strut the nipping action ceases, the pressure plate,
however, still serving to draw the side plates into contact with the wheel rim and
so maintaining a checking or brake action upon the said wheel.
Various means may be employed for raising and lowering the outer end of the
lever, but in practice I find it advantageous to form a curved incline on its under
side and allow it to rest upon a roller carried by a rocking-bar having its centre at
one side of the centre of the curve of the lever (thereby giving an eccentric
motion) and enabling the roller not only to increase or diminish the nipping action,
as it is moved towards or away from the end of the lever, but also to raise or lower
the lever from or on to the strut.
To enable my invention to be fully understood I will describe it by reference to
the accompanying drawing, in which:-
Figure 1 is an elevation of my improved brake mechanism :
Figure 2 is a sectional plan of the same :
Figure 3 is a detail view shewing the nipping-lever resting on the strut or stop.
a is the nipping-lever or pawl, and b, bare the side plates which are bolted to
the nipping-lever a by means of the bolt c and nuts d,'d and which are provided
with internal flanges e, e adapted to clip the rim f of the wheel or barrel g.
his the pressure plate arranged between the inner end of the lever a and the
rim of the wheel g and secured to the side plates b, b by means of pins i, i which
pass through eyes j, j in the pressure plate 7. k is the strut or stop on which the
inner end of the lever a can rest.
is the curved incline on the underside of the outer end of the nipping-lever,
and m is the roller, carried by the rocking bar n pivoted to a bracket o, on which
roller the curved portion of the lever rests. The centre of the roller m, as shewn
in Figure 1, is not in the same vertical line as that of the curve of the lever so
that, as above described, when the rocking bar n is moved on its pivot the roller m
receives an eccentric motion with regard to the curve of the lever so that the outer
end of the said lever is raised or lowered.
The action of my improved brake imechanism is as follows:-To prevent any
backward action of the wheel g the rocking bar n is moved so as to run the roller m
towards the outer end of the nipping-lever a in order to raise it and cause the inner
end of the said lever to press against the pressure plate and thereby nip the
wheel rim. To take off the nipping action the rocking bar n is moved in the
opposite direction to that above mentioned, that is to say, away from the outer
end of the nipping-lever a whereby the said lever is lowered and the nipping action
removed, as shewn in Figure 3.
It will be obvious that the pressure plate / brakes the wheel g in all positions of
the lever.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. Brake mechanism, for windlasses and other machinery, having a nipping-
lever provided with side plates and a pressure plate adapted to clip the rim of the
wheel or barrel to be controlled, a strut or stop for limiting the movement of the

page_text: inner end of the nipping lever and means for raising and lowering the outer end of
the said lever, substantially as described.
2. In brake mechanism of the kind described curving the underside of the outer
end of the nipping-lever and allowing it to rest on a roller carried by a rocking
bar for the purpose of raising and lowering the said lever, substantially as
described.
3. The combination of parts forming the improved brake mechanism for
windlasses and other machinery hereinbefore described and illustrated in the
accompanying drawing.
Dated this 10th day of June 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.