IMPROVEMENTS IN OR ADDITIONS TO, SCREW PRESSES
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Joel Cadbury at the Office of the
Commissioners of Patents on the 29th August 1883.
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JOEL CADBURY of the Firm of Green Cadbury and Richards of Birmingham in the
County of Warwick, Manufacturers, " IMPROVEMENTS IN OR ADDITIONS TO, SCREW
PRESSES
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Presses usually employed for cutting out, piercing, stamping, shaping, closing
and otherwise operating upon sundry materials, in various branches of manufacture;
are of the kind called Screw or Fly presses; and consists of a horizontal or bent
lever carrying weighted balls, through which momentum is imparted to a quick
threaded screw, working within a screw box, and attached to a guiding slide, to
which the operating tools are connected. On rotating by hand, the lever carrying
the weighted balls described; the tools are driven forward acting upon the work
under operation.
My invention has reference principally to working or operating the said screw
presses by foot, instead of by hand as heretofore. Or the said presses may be
worked both by foot, and by hand, either combined, or acting alternately. Or the
said presses may be worked by power alone.
I will describe my invention as applied to a press worked by foot.
A quick threaded vertical screw works within a fixed screw box attached to
suitable framing as usual; and at the lower part of the said screw, the usual
guiding slide and fittings carrying the operating tools are attached.
A long lever jointed to a fixed bracket attached to the frame or other
convenient part of the press actuates the screw, by a vertical or downward thrust
or movement of the short arm of the said lever; the end of the said short arm is
forked, which embraces an annular recessed neck part or collar situated at the
upper extremity of the screw.
Antifriction rollers centered in the forked end of the short arm of the lever, bear
and rotate vertically upon the upper and lower shoulders alternately of the annular
neck or collar of the screw described.
The other or long end of the lever is jointed by a connecting rod to a jointed
forked pedal or lever which is actuated by by the foot, for operating the press.
The long arm by the motion of the foot pedal raised vertically, and thereby
depressing the forked short arm, and with it, the screw, slide and tool carrier. The

page_text: operating screw is also weighted at its summit for the purpose of giving greater
momentum or impetus, to the descending tool and parts carrying it.
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The action of the press is as follows; On placing the foot of the operator on
the pedal lever, motion is communicated through the connecting rod to the long
arm of the screw operating lever; the long arm of the said lever is by the pedal
motion mised vertically, and consequently on depressing the short arm, the forked
end of which depresses or lowers vertically the screw, which at the same time
rotates within the fixed screw box.
By the long arm operating the lever the guiding slide, tool and moveable
parts connected therewith are brought down upon the work under operation.
Therefore the depression of the short arm imparts both a vertical and a rotary
movement to the screw, the antifriction rollers travelling around the lower collar
or ledge of the annular collar or shoulder formed in or on the screw stem. The
weight before described assists the vertical downward movement of the screw.
The upward movement of the long arm of the lever expands a coiled spring
attached to its end. So that on the operator removing the foot from the trendle
lever, the spring under tension depresses the long arm of the lover, and raises the
short end; and with it the screw, and parts carried therewith. The whole of the
parts again taking their normal respective positions.
By the above arrangement of working screw presses, the operator is perfectly
free, with both hands to adjust the work under operation; while the foot only is
applied to work the press.
When I employ power instead of as before described, the pedal lover arrangement
is dispensed with; the necessary motion being communicated directly from a shaft
or other gearing to the long arm of the lever, or to the head or annular neck, collar
or recess of the screw as described.