A NEW AND USEFUL DEVICE FOR TURNING CROSS-HEAD WRISTS OR PINS, OR FOR TURNING ANY CYLINDRICAL PART OF MACHINERY WHICH IS SECURED BETWEEN Two ARMS
Year: 1863

page_text: PROVISIONAL SPECIFICATION left by William Clark at the Office of the
Commissioners of Patents, with his Petition, on the 8th June 1863.-
A communication from abroad by Walter Scott Phelps, of Detroit,
Wayne County, State of Michigan, United States of America.
I, WILLIAM CLARK, of 53, Chancery Lane, in the County of Middlesex,
Engineer, and Patent Agent, do hereby declare the nature of the said Inven-
tion for "A NEW AND USEFUL DEVICE FOR TURNING CROSS-HEAD WRISTS OR PINS,
OR FOR TURNING ANY CYLINDRICAL PART OF MACHINERY WHICH IS SECURED BETWEEN
Two ARMS," to be as follows:-
This Invention relates to a new and useful implement or device for turning
the wrists or pins of cross heads, and for turning any other cylindrical part of
machinery which is secured to or formed between arms, connected at one end
by a permanent cross bar, which prevents the cylindrical part being rotated
by entire revolutions in a lathe, and, consequently, precludes said part being
turned with facility.
The usual mode employed for turning such cylindrical parts of machinery is
to centre them in a lathe, and allow them to turnone-half a revolution, which is
all the distance they can turn on account of the cross bar, and then reverse the
movement of the article, so that it may turn back; and then make another
half revolution, the cutting tool acting upon half of the part to be turned.
This is a slow and tedious operation, which is avoided by this Invention, the
latter consisting in the employment or use of a guard-rotating ring, having a
cutter affixed to it, and used in connection with an adjustable bed plate, all
arranged as herein-after fully shown and described.

page_text: A horizontal bed or lower plate is provided with an upright curved T-shaped
projection at one end, on which a cap is placed, and secured by bolts. In this
projection there is made a semicircular recess, and a similar shaped recess is
made in the cap, the two recesses, when the cap is secured on the projection,
forming a circular opening, in which a ring is fitted, said ring having a rebate
at each side of it, into which flanges on the cap and projection fit, and retain
the ring in proper position. The ring is toothed at its periphery, and has a
pinion gearing into it, said pinion being on a shaft which has a driving pulley
upon it. The ring is made in two parts, connected together by rivets, bolts,
or screws, arranged in any proper way, so that the two parts may be dis-
connected to admit of the ring being fitted on the part to be turned; and said
ring has also a groove or recess made transversely in its inner side to receive a
nut. This groove or recess is of dovetail form in its transverse section, so
as to hold the nut, and at the same time admit of the latter sliding in it. A
screw carrying a nut is fitted at its ends in plates, which are secured one at
each end of the ring, and on one end of said screw there is fitted a tappet
wheel. In this nut the cutting tool is also fitted. To one side of the
cap there is secured a socket, which has two slides fitted in it, one slide
being in contact with the other, and both provided at their lower ends with
pins. The one slide is longer than the other, and the pin of the former
projects through a slot in the latter, and the lowest slide has a cleet or
guide at its inner side, which also fits in the slot of the long slide. Both
slides are perforated with two holes, to receive a pin at the lower end of
a lever, the fulcrum pin of which is connected to the socket, and the lever has
a spring acting against it, which has a tendency to keep the pins in the holes.
Both of the slides are adjustable, and by means of the pin and slide holes the
slide pins may be so placed or adjusted relatively with the tappet wheel, that
the arms thereof may come in contact with either of them, as desired. The
one slide pin is below the tappet wheel, and the other above it, and conse-
quently, the wheel and screw may be turned in either direction as desired.
The screw moves the nut, and consequently the cutter or tool, giving the
latter its feed motion at every revolution of the ring. The slides may also be
arranged so that both pins may be adjusted free from the tappet wheel.
On the bed plate is superposed another similar plate, having a cleet at its front
end and under side, said clect fitting a recess in the bed plate. The super-
posed plate at its back part may be raised and lowered, and secured at any
desired angle, by means of a vertical screw which passes up through the plate.
On this superposed plate there is a third plate, which rests or is fitted upon
two parallel ways or guides on the plate. This third plate has an inclined

page_text: plate attached to it, or both of these plates may be cast in one piece, the latter
having a recess or chamber in it to receive a part of the projection in which
the ring is fitted, the sides of the recess or chamber serving as a support for
the inclined plate. The second plate may be moved or adjusted forward or
backward on the ways or guides by means of a screw.
The cross head or other article to be operated upon is firmly secured on the
inclined plate, and the cap is detached from the projection, and the two parts
of the ring separated, so that they may be fitted over the wrist of the cross
head. The wrist is then adjusted centrally within the ring, by inclining the
plate more or less through the medium of a vertical screw, and by adjusting
said plate further forward or backward through the medium of the horizontal
screw. These plates are then secured in position by bolts. The cutter is then
adjusted in a proper working position, which may be done by means of a
punch inserted in a hole in either side of the ring. The cutter is placed at
one end of the screw, and the shaft is rotated by any convenient power, and a
rotary motion communicated to the ring by means of the pinion gearing into
the teeth on the periphery of the ring. The cutter is thus made to act upon
the wrist of a cylindrical form, the tool being fed along at each revolution
of the ring by means of a screw, which is actuated or turned in consequence
of the arms of the tappet wheel coming in contact with one of the slide pins.
By this means the cutter is fed along the wrist in either direction, according
to which of the pins is set for the tappet wheel to act against, and the wrist
will consequently be turned in cylindrical form.
The cutting tool may be fed or adjusted to its work by having a screw fitted
in its outer end, said screw working in a female or internal screw in the tool,
and having a worm wheel on its outer end, into which a screw gears, said
screw being on a shaft, and connected thereto by a feather and groove, or in
any other proper manner, which shaft has its bearing in plates attached to
the sides of the ring. The cutting tool is fitted in the nut so as to slide
therein.