IMPROVEMENTS IN OPERATING SEWING AND OTHER TREADLE MACHINES
Year: 1874

page_text: LETTERS PATENT to Edmund Wright, of Birmingham, in the County
of Warwick, for the Invention of "IMPROVEMENTS IN OPERATING SEWING
AND OTHER TREADLE MACHINES.”
Sealed the 29th December 1874, and dated the 17th November 1874.
COMPLETE SPECIFICATION filed by the said Edmund Wright at the
Office of the Commissioners of Patents, with his Petition and
Declaration, on the 17th November 1874, pursuant to the 9th.
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDMUND
WRIGHT, of Birmingham, in the County of Warwick, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS
IN OPERATING SEWING AND OTHER TREADLE MACHINES," and have petitioned
Her Majesty to grant unto me, my executors, administrators, and
assigns, Her Royal Letters Patent for the same, and have made.
solemn Declaration that I am the true and first Inventor thereof.
-
.
NOW KNOW YE, that I, the said Edmund Wright, do hereby
declare that the following Complete Specification, under my hand and

page_text: scal, fully describes and ascertains the nature of the said Invention,
and in what manner the same is to be performed in and by the following
statement, reference being had to the accompanying Sheet of Drawings,
and to the letters and figures marked thereon (that is to say) :—
My Invention relates to improvements in the double clutch for
operating sewing and other treadle machines, for which Letters Patent
were granted to me, bearing date August 25th 1874, No. 2903.
The improvement consists in an improved arrangement of the clutch,
and in the employment of friction discs with V edges, and corresponding
V grooves in the face of the wedges (or the discs may be grooved and
the wedges have projecting V faces), whereby a better bite of the wedges.
is ensured; also in the relative arrangement of the wedges and the
levers by which they are operated, whereby I am enabled to use friction
discs of greater diameter, and levers of greater length than if the levers
were placed directly behind the wedges, as before, so that the clutch
is less likely to be affected by wear of the parts.
Figure 1 is a part sectional view of the improved double clutch, and
Figure 2 is a cross section on line 1-1, Figure 1.
A, A, are two hollow pulleys fitted to revolve alternately backward
and forward (to the extent indicated by the arrows) on a hollow
spindle B, upon which are fixed or formed two friction discs b, b,
having shaped edges, as shown. The centre spindle C is fixed to
the machine frame as before. The wedges c, c, are made with V shaped
grooves to correspond with the edges of said discs, sufficient allowance
being made, as shown at the bottom of the grooves, to allow for
ordinary wear of the surfaces, and to prevent the angular ridges of
the discs coming in immediate contact with the bottom of the grooves
in the wedges. The wedges c, c, have lugs d at the side which extend
towards the centre of the clutch, and against which lugs (when
influenced by the motion of the treadles) the levers e, e, press, thus
forcing the wedges c, c, between the rollers f, f, and the edge of the
discs b; b, and so locking the pulleys A, A, with spindle B, and
causing it to rotate, as fully described in my previous Patent already
referred to.
It will be seen that in this improved clutch the internal mechanism
of the two halves of the clutch is disposed near the centre instead
of at the sides as before, whereby the cost of manufacture is reduced.
:

page_text: The application of this clutch to existing or new machines being
precisely similar to that described in my previous Patent no further
explanation is necessary.
Flat or round belts may be used to connect the clutch with the
treadles, I however prefer flat belts, and the peripheries of the pulleys
A, A, are accordingly made flat, and the belts are attached to and
operate the clutch as described in my said previous Patent.
Having described the nature of the Invention, and the manner of
performing the same, I declare that what I claim as new and desire
to secure by Letters Patent is,―
1st. The improved double clutch constructed and arranged substan-
tially as herein described and shown in the accompanying Drawings.
2ndly. In clutches of this construction the use of Vedged friction
discs on the hollow spindle in combination with wedges having a
corresponding V shaped face, substantially as and for the purposes herein
set forth.
3rdly. The relative arrangement of the levers e and their wedges
c, c, provided with lugs d, substantially as and for the purposes specified.
In witness whereof, I, the said Edmund Wright, have hereunto
set my hand and seal, this Sixteenth day of November, in
the year of our Lord One thousand eight hundred and seventy-
four.
EDMUND WRIGHT. (L.S.)