IMPROVEMENTS IN BRAKES FOR THE BOBBINS OF THROSTLE FRAMES
Year: 1880

page_text: LETTERS PATENT to John Clayton Mewburn, of 169, Fleet Street, in the
City of London, Patent Agent and Consulting Engineer, for an Invention of
"IMPROVEMENTS IN BRAKES FOR THE BOBBINS OF THROSTLE FRAMES."
A communication from abroad by Hector Detraux, of Arques, France.
PROVISIONAL SPECIFICATION left by the said John Clayton Mewburn
at the Office of the Commissioners of Patents on the 25th August 1880.
JOHN CLAYTON MEWBURN, of 169, Fleet Street, in the City of London, Patent
Agent and Consulting Engineer. “IMPROVEMENTS IN BRAKES FOR THE BOBBINS
OF THROSTLE FRAMES." [A communication from abroad by Hector Detraux, of
Arques, France.]
·
The apparatus which has hitherto been usually employed as a brake for the
bobbins of throstle frames consists of cords and weights, by means of which
friction has been produced on the lower flange of the bobbins.
Now according to the present Invention, instead of employing cords and weights
the requisite friction is produced by means of a spring, which is more constant,
more durable, and more easily regulated. In order to carry out the Invention I
fit to the bar which supports the bobbins a metallic spring either of flat or round
section; this spring, except its ends, is enclosed by a box or cap which is fixed to
the same bar by a bolt or screw, or otherwise. One end of the spring bears
against the lower flange of the bobbin, while the other end is held in one of the
notches in the front edge of the bobbin bar. A loop or strap acts as a guide to
this end of the spring. As the bobbin increases in size the end of the spring is
advanced from one notch to another, and the friction or pressure of the other end
upon the bobbin flange is thereby suitably regulated.
The spring may be arranged otherwise than above described. For example,
while one end bears against the bobbin flange, the other end may be fitted in a
holder which is pivotted to the bottom bar and carries a rod to take into the
notches before referred to. Thus by shifting this rod from one notch to another
the spring is acted upon through the holder, and its pressure upon the bobbin flange
thereby regulated.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Clayton Mewburn in the Great Seal Patent Office on the 18th
February 1881.
JOHN CLAYTON MEWBURN, of 169, Fleet Street, in the City of London, Patent
Agent and Consulting Engineer. "IMPROVEMENTS IN BRAKES FOR THE BOBBINS
OF THROSTLE FRAMES." (A communication from abroad by Hector Detraux, of
Arques, France.)
The apparatus which has hitherto been usually employed as a break for the
bobbins of throstle frames consists of cords and weights, by means of which
friction has been produced on the lower flange of the bobbins.
Now according to the present Invention, instead of employing cords and weights
the requisite friction is produced by means of a spring which is more constant,
more durable, and more easily regulated. In order to carry out the Invention I
fit to the bar which supports the bobbins a metallic spring either of flat or round
section; this spring, except its ends, is enclosed by a box or cap, which is fixed to
the same bar by a bolt or screw, or otherwise. One end of the spring bears
against the lower flange of the bobbin, while the other end is held in one of the
notches in the front edge of the bobbin bar. A loop or strap acts as a guide to this
end of the spring. As the bobbin increases in size the end of the spring is advanced
from one notch to another, and the friction or pressure of the other end upon the
bobbin flange is thereby suitably regulated.
The arrangement above described is represented in Figures 1 and 2 of the
annexed Drawings; A, A, are the bobbins, and B is the bar which supports them;
R, R, are metallic springs, one for each bobbin. These springs are enclosed, except
at their ends, in boxes or caps C, C, which are fixed to the bar B by bolts V. The
end a of each spring bears against the lower flange of the corresponding bobbin,
while the other end b is held in one of the notches e, e, in the front edge of the
bar B; d, d, are the loops or straps to guide the ends b of the springs. The
arrows 1, 2, indicate the direction in which the springs are advanced from one
notch to another as the bobbins increase in size.
The spring may be arranged otherwise than above described. For example,
while one end bears against the bobbin flange, the other end may be fitted in a
holder which is pivotted to the bobbin bar and carries a rod to take into the
notches before referred to. Thus by shifting this rod from one notch to another,
the spring is acted upon through the holder, and its pressure upon the bobbin flange
thereby regulated. This arrangement is shown in Figures 3 and 4; f, f, are the
pivoted holders in which the ends b, b, of the springs are fitted.
Having now described the nature of the said Invention as communicated to me,
and in what manner the same is to be performed, I declare that I claim,-
Fitting the bobbins of throstle frames with brakes formed of adjustable metallic
springs, applied substantially as hereinbefore described.
In witness whereof, I, the said John Clayton Mewburn, have hereunto set
my hand and seal, this Eighteenth day of February, One thousand eight
hundred and eighty one.
J. C. MEWBURN. (L.B.)