IMPROVEMENTS IN CONVERSION GEARING
Year: 1879

page_text: LETTERS PATENT to Herbert John Haddan, of the Firm of Herbert and
Company, Solicitors of Patents, of 67, Strand, in the City of Westminster,
Civil Engineer, for the Invention of "IMPROVEMENTS IN CONVERSION
GEARING." A communication from abroad by Irving Montgomery Avery,
of the City and State of New York, United States of America.
Sealed the 27th December 1879, and dated the 16th July 1879.
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at
the Office of the Commissioners of Patents on the 16th July 1879.
HERBERT JOHN HADDAN, of the Firm of Herbert and Company, Solicitors of
Patents, of 67, Strand, in the City of Westminster, Civil Engineer. IMPROVEMENTS
-IN CONVERSION GEARING." A communication from abroad by Irving Montgomery
Avery, of the City and State of New York, United States of America.
:
The Invention has for its object the conversion of rotary motion into recipro-.
cating motion, and consists in fixing on the shaft from which the motion is derived,
an oblique disc provided with a ring or strap similar to an ordinary eccentric, to
said ring or strap being attached a rod (analogous to an eccentric rod), which by
the revolution of the shaft receives a reciprocating motion in a plane parallel to
the axis of the shaft. The end of the said rod moves a slide, preferably by means
of two short links and a connecting rod placed between the end of the disc, rod,
and the slide. The connecting rod being guided in an open. bearing, and the,
mechanisin made wholly or entirely of metal. The mechanism may be used for
converting the revolving motion of a shaft into a sliding motion parallel to the
axis of the shaft, and is especially intended for sewing machines, but may be used
in many other places.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said
Herbert John Haddan in the Great Seal Patent Office on
the 14th January 1880.
HERBERT JOHN HADDAN, of the Firm of Herbert and Company, Solicitors of
Patents, of 67, Strand, in the City of Westminster, Civil Engineer. IMPROVEMENTS
IN CONVERSION GEARING." A communication from abroad by Irving Montgomery
Avery, of the City and State of New York, United States of America.
This Invention consists in the combination with an oblique disk mounted on a
revolving shaft of a lever, which connects with a slide, so that when the shaft is
turned a reciprocating motion is imparted to the slide.

page_text: THE is a sectional pra of a mouffication.
Similar letters indicate corresponding parts.
In these Drawings the letter A designates a shaft mounted in suitable bearings,
so that a revolving or rocking motion can be imparted to it in either direction.
On this shaft is firmly secured a circular disc B, which however is placed in an
oblique position towards the shaft, as clearly shown in Figs. 1 and 3.
On this
disk is placed a strap C from which extends a lever D; E represents the slide
moving on a suitable guide F, and the lever D is connected to this slide by means
of links d, e, and an intervening connecting rod G.
In the example shown in Fig. 1, the strap C is made to overlap the edges of
the disk B, and it is held in position by a ring plate a, which is fastened to it
by screws b. Instead of this however, the disk B might be provided with a groove
in its periphery to receive the strap in the same manner as straps are usually con-
nected to eccentrics; or the connection between the lever D and the disk B might
be effected in various ways, such for instance, as that shown in Fig. 3, where the
disk B is made in two parts, between which is placed the lever D). The lever I)
is provided near its lower end with a shoulder f, Fig. 2, against which rests the
upper part of the pivot i. This pivot is provided with a hole through which
passes the lower end of the lever D, and said pivot is held in place by a screw y
screwed into the lower end of the lever D, or by any other suitable means. This
pivot turns in the bearings formed by the two arms of the link d, as plainly
shown in Fig. 2.
When the shaft A is revolved an oscillating motion is imparted to the lever D
by the oblique disc B, the position of which in regard to the shaft changes from
the position shown in full lines to that shown in dotted lines in Fig. 1, and by
the action of the lever a reciprocating motion is imparted to the slide E. During
this motion the links d and swing in their bearings, and the connecting rod G
which is guided in an open bearing his free to adapt itself to the position of the
links, so that the power transmitted from the lever D is brought to act on the
slide E always in the direction of the motion of said slide, and the crowding of
the slide on its guide or in its bearings is effectually prevented. This Invention
is intended particularly for imparting motion to the shuttle carrier of a sewing
machine, but it is applicable for many other purposes where a rotary motion is to
be converted into a reciprocating motion.
The combination with an oblique disk B3 mounted on a revolving or rocking
shaft of a lever D, which connects with a slide by means substantially such as
herein described, so that when the shaft is turned, a reciprocating motion is
imparted to the slide, and the slide is prevented from being crowded on its guide
or in its bearings.
In witness whereof, I, the said Herbert John Haddan, have hereunto set
my hand and seal, this Fourteenth day of January, A.D. 1880.
H. J. HADDAN. (L.S.)