A NEW WHEEL PINION FOR RIGGERS DRIVING OPERATORS
Year: 1866

page_text: PROVISIONAL SPECIFICATION left by Frederick Ruppert at the Office
☐ of the Commissioners of Patents, with his Petition, on the 20th April
1866.
I, FREDERICK RUPPERT, of Chemnitz, in the Kingdoin of Saxony, Engineer,
do hereby declare the nature of the said Invention for." A NEW WHEEL
PINION FOR RIGGERS DRIVING OPERATORS," to be as follows:-
This Invention relates to a novel arrangement and construction of wheel
pinion applicable to riggers for the purpose of driving operators or machines
of various kinds, more especially lathes for boring, turning, cutting screws, and
other purposes. The rigger (consisting of a compound series of rigger-driving
pulleys, varying in diameter, and being actuated by a driving band in the usual
manner) is to be set loosely on an axle so as to rotate thereon without com-
municating motion; at the surface of the smallest rigger a pinion is placed, also
loose on the axle, but attached securely to the rigger; this pinion wheel gears
into a larger toothed wheel which is keyed on another axle parallel with the
first; this axle therefore is only permitted to rotate, and cannot move transversely
or radially. At the other end of this axle a pinion wheel is also keyed. On.
the first-mentioned axle and beyond the largest of the riggers a large toothed.
wheel is placed and fastened by keys or wedges in grooves or feathered recesses,,
but capable of sliding on the axle in either direction; when it is brought in
contact with the rigger a projection or clutch from the face of the rigger gears
against one of the spokes of this toothed wheel, and communicates motion
thereto, and consequently to the axle on which it is set, such axle having other-
wise no motion, as before stated. If on the contrary this wheel is moved

page_text: away from the rigger the clutch is out of gear, and the cogs or teeth then
catch in the teeth of the pinion wheel keyed on the moving parallel axle; in
such case, therefore, the rigger, axle, or shaft is moved indirectly by means of
the two pairs of cog wheels. This arrangement of wheel pinion may be
applied to all operators which demand a different rotative velocity, as, for
instance, to lathes and boring machines. It affords a more easy and rapid
adjustment than any other system heretofore in use. In lathes it offers the
following peculiar advantages -The rotating axle may be used at the self-
acting pillar, turning to transmit the movement from the mandril upon the
leading mandril, because it is always in motion whether worked by the rigger
pinion or the large toothed wheel on the rigger axle. If a forked lever is used
to change the position of the large toothed wheel to place it in gear with the
rigger or with the pinion the workman is enabled to change at pleasure the
direction of rotation of the rigger axle, and at the same time to diminish or
increase its velocity.
The Invention may be advantageously applied if turns of screws are to be
made in the lathe, it is worked in such case with the engaged pinion during
the cutting, and with the disengaged pinion, that is to say, with a greatly
increased velocity, during the return of the tool to the beginning of the screw
which is to be cut.