IMPROVEMENTS IN OPERATING SEWING AND OTHER TREADLE MACHINES
Year: 1874

page_text: LETTERS PATENT to Edmund Wright, of Evesham, in the County of
Worcester, for the Invention of "IMPROVEMENTS IN OPERATING SEWING
AND OTHER TREADLE MACHINES."
1
Scaled the 1st May 1874, and dated the 10th March 1874..
'
COMPLETE SPECIFICATION filed by the said Edmund Wright at the
Office of the Commissioners of Patents, with his Petition and
Declaration, on the 10th March 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 Evesham, in the County of Worcester, 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 Declara-
tion 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 scal,
.

page_text: 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) :—
.
The object of my Invention is to produce continued rotary motion of
the fly or band wheel by the reciprocating motion of the treadles
through the medium of a double clutch and appurtenances constructed
and combined as shown in the accompanying Drawings. Like letters
correspond with like parts in each.
Figure 1 is a front elevation of the clutch, the spindle B being 1
attached to the frame in the ordinary manner, and the fly or band
wheel to the part A in any convenient way. The construction and
working of the clutch is shown more in detail in the sectional Figures 2
and 3. D is a drum on the reverse sides of which is formed the
cylindrical grooves C, C, and cast with or joined to which is the hollow 1
socket A.
Figure 2 is an end view with one of the pulleys E, E, removed to
show a sectional view of the action of one of the two clutches, as at
Figure 3. F is a piece of metal attached to the pulley E at K, and
terminating in a wedge f, of similar shape to that shown in Figure 2, 2
having a hole drilled from one end to receive the spiral spring G, and
having a slot at its opposite end (Figure 3) in.. which moves freely the
arrow shaped wedge H, against which presses the spring G. The
grooved rollers I, I, are placed on either side of the part F, which by its
wedge shaped end allows them to move freely for a short distance in one 2
direction, but prevents them in the other. The arrow shaped wedge H
answers the triple purpose of keeping the rollers I, I, in the lateral
position, extending them by the action of the spring G towards the
narrow parts of the passages formed by the part F and the sides of the
cylindrical grooves C, C, and acting as a bearing on which they freely a
revolve at their grooved or lesser diameters. The pulleys E, E, are made
to revolve alternately backwards and forwards (as described in the
Specification of Letters Patent granted to me, bearing date January 10th
1874, No. 140) on the pin B and hollow socket A, carrying with them
the blocks F, F.
It is obvious that on the block F moving in the direction N to M

page_text: surfaces of the groove C, and carry with them the arm D and also
socket A. On the backward motion of the block F from M to N, the
rollers are instantly loosened, their tendency being to run up the
inclined surfaces of the wedge H, which being free to yield by its
spring G, allows the rollers to move towards the wider parts of the
chambers, and consequently out of contact with F.
Now although the pressure on the arrow wedge H is equal to that on
the surfaces c, c, the frictional resistance of the rollers I, I, is overcome
by the difference in the radii of their grooved and outer peripheries.
In certain machines where a shaft is made use of, the socket A, A, is
dispensed with, the drum D being attached direct to the shaft and the
pulleys E, E, revolving on it.
Having described the nature of my 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. I claim as my Invention the combination of the rollers I, I, the
part F in the cylindrical grooves C, C, for the purposes, substantially as
described.
2nd. The combination of the spring G, the wedge H, with the
grooved rollers I, I, in the manner and for the purposes, substantially as
described.
3rd. The employment in a clutch of a roller of different diameters at
different parts of its length, so that the friction on the periphery of its
greater diameter shall overcome the friction on the periphery of the
5 lesser, and ensure its rolling in the backward motion as described.
In witness whereof, I, the said Edmund Wright, have hereunto set
my hand and seal, this Tenth day of March, in the year of our
Lord One thousand eight hundred and seventy-four.