IMPROVEMENTS IN BRAKES
Year: 1871

page_text: Sealed the 3rd May 1872, and dated the 6th November 1871.
PROVISIONAL SPECIFICATION left by the said John Blakey at the
Office of the Commissioners of Patents, with his Petition, on the
6th November 1871.
I, JOHN BLAKEY, of Leeds, in the County of York, do hereby declare
the nature of the said Invention for "IMPROVEMENTS IN BRAKES," to be
as follows: -
My improvements are particularly applicable to sewing machines
driven by power, but may be applied to other machinery where brake
power is required, whereby the motion may be either retarded or stopped
at pleasure.
My Invention consists in an arrangement as hereafter described,
whereby the driving band or strap is slackened simultaneously with the
brake block being brought into operation.

page_text: In suitablo bearings I mount a lever carrying on one end of it a brake
block, and on the same lever or when requisite on another lever I mount
a loose roller so as to work freely thereon. When two levers are employed
they are so connected by rods or other couplings as to work or to be
brought into operation simultaneously in the same manner as when only
one lever is employed, that is, when the roller is made to press against
the driving band or strap, thereby giving it the required tightness, the
brake is relieved from the driving pulley simultaneously therewith, and
when the brake block is brought into operation against the driving
pulley the pressure of the roller is simultaneously taken off the band or
strap, thereby slackening it. By this arrangement the revolving of the
driving pulley may be stopped instantaneously or retarded in its move-
ment as may be required.
The above described arrangement may be brought into operation either
by hand levers or treadles connected therewith by rods or other suitable
means. Weights or springs may be attached to the levers to assist in
their operation.
SPECIFICATION in pursuance of the conditions of the Letters' Patent,
filed by the said John Blakey in the Great Seal Patent Office
on the 6th May 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
BLAKEY, of Leeds, in the County of York, send greeting..
}
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date, the Sixth day of November, in the
year of our Lord One thousand eight hundred and seventy-one, in the
thirty-fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said John Blakey, Her special licence
that I, the said John Blakey, my executors, administrators, and
assigns, or such others as I, the said John Blakey, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
i

page_text: BRAKES," upon the condition (amongst others) that I, the said John Blakey,
my executors or administrators, by an instrument in writing under my, or
their, or one of their hands and seals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the
same was to be performed, and cause the same to be filed in the Great
Seal Patent Office within six. calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Blakey, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement, reference being had to the accompanying Drawings
and to the letters of reference marked thereon, that is to say :-
-
My improvements are particularly applicable to sewing machines
driven by power, but may be applied to other machinery where. brake
power is required, whereby the motion may be either retarded or stopped
at pleasure.
My Invention consists in an arrangement as hereafter described,
whereby the driving band or strap is slackened simultaneously with the
brake block being brought into operation.
The Invention will be best understood by reference to the accom-
panying Drawings:-
Figure 1 is a side clevation, and Figure 2 is a perspective view of a
sewing machine with my Invention applied thereto.
In suitable bearings a I mount the bell-crank lever 6 carrying the
brake block c; on the same bell-crank lever 6 I mount the loose roller d
so as to work freely; on the outer end of the bell-crank lever I provide
the weight e or spring f for giving power or pressure to the brake block.
I have shewn the brake in operation on the wheel g of a sewing machine,
and the loose roller d clear of the driving belt or cord h, when the brake
is in operation the belt or cord h is slack and the machine is at a stand-
still. In order to put the wheel or pulley g in motion the brake is
relieved therefrom, at the same time the loose roller d is brought to bear
upon the belt or cord, thereby tightening the belt or cord / between
the driving pulleys ; and the pulley or wheel g.
The above-described arrangement may be worked by means of the
treadle connected thereto by the rod 7, which arrangement produces a

page_text: self-acting brake motion. In order to stop the machine the attendant
takes his foot off the treadle k, the weight e or spring f immediately
begins to operate by bringing the brake block in contact with the wheel
or pulley, at the same time carrying the loose roller d clear of the belt
or cord h, thereby producing an immediate stoppage of the machine.
I would here remark that my Invention is also applicable to other
machines.
i
It will be readily understood that there are many arrangements that
could be applied for operating the brake block c and loose pulley d
simultaneously, by varying the arrangement and position of the lever or 1
levers and other parts connected therewith.
Having now described the nature of my said Invention, and the
manner in which the same is to be performed, I declare that I do not
limit myself to the exact limits, details, and configuration of parts I
have explained and shewn, as the same may of course be varied or 1
modified without in any way departing from my Invention; but what I
do claim and desire to be secured to me by Letters Patent is,-
Firstly. The arrangement, construction, and application of self-acting
brake, belt or cord tightening roller, and the parts in connection there-
with, substantially as and for purposes herein set forth.
Secondly. The application of the combined action of the brake block
c and loose pulley d for the purpose of stopping and giving or trans-
mitting motion to machines, substantially as and for purposes herein set
forth.
2
In witness whereof, I, the said John Blakey, have hereunto set 2
my hand and seal, this Fourth day of May, in the year of our
Lord One thousand eight hundred and seventy-two.
JOHN BLAKEY. (L.S.)