Improvements in Overhead Driving Gear.
Year: 1894

page_text: 27th
Date of Application, Jony
4004
Complete Specification Left, 27th Nov., 1894-Accepted, 29th Dec., 1894
Complete Specification Left, 27th Nov., 1894-Accepted, 29th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in Overhead Driving Gear.
I, WILHELM VON PITTLER, of 144 High Holborn, in the County of London,
Manufacturer of Universal Machine Tools, do hereby declare the nature of this
invention to be as follows:-
This invention relates to overhead driving gear with friction clutches and more
particularly to an improved arrangement enabling the direction of rotation of the
shaft to be readily reversed.
The principle of the invention will be best realized by the aid of the accompanying
drawings ;-
The gearing consists of a hollow shaft a upon which two stepped cones 66' are
loosely mounted. Between the said stepped cones bb a pulley c is rigidly secured
to the said shaft a (Fig. 2). The pulley c is encircled by two rings d d' which at
one point of their periphery have each a tapered slot (Fig. 4), in which pins e el
adjustable by means of a rod or bolt fare adapted to engage. If a single strap be
used for reversing motion, there is secured to the bearing or hanger g a piece /
provided with a guide groove h¹ in which is fitted a pivot i carrying the guide
pulley k. The tension of the strap is controlled by means of the spindle shown in
Fig. 4. The direction of the strap is as follows; from the transmission pulley z to
the largest section of the offset pulley b¹ (Figs. 1 and 3); hence over the guide
pulley and back to the pulley z. Owing to this arrangement of the strap the
stepped cones bb always turn in opposite directions.
The operation is as follows;-
Into the bore of the shaft a is inserted the bolt or rod f (Fig. 2) to which is
secured a double cone f¹. The pins e and e¹, removeably fitted in the pulley C and
engaging with the tapered slots of the rings d d', slide upon the cones fl mounted.
on the said rod f. By means of the lever 1, this rod f may be reciprocated.
Therefore, by pressing the rod f further into the bore of the shaft a, the bolt e is
forced by the cone f¹ into the tapered slot of the ring d, which is thereby carried
round along with the stepped cone b, and consequently sets the pulley and shaft a
also in rotary motion. By drawing the bolt or rod in the opposite direction,
however, the bolt e is released, and the ring d is disengaged from the wall of the
stepped cone b, while the rod f now forces the other bolt e¹ into the slot of the
second ring d¹ so that the pulley c, by reason of the connection of the said ring d¹
with the stepped cone 6¹, receives rotary motion in the opposite direction from this
pulley b
The motion thus produced is conveyed to the machine to be driven through the
medium of a belt pulley m.
The adjustment of the bolts e e' is effected in the following manner; Each of the
said bolts e el consists of two parts, one of which is tapped and the other screw-
threaded externally, one part being screwed into the other, and a counter nut n
being provided to tighten the joint. In the sides of the stepped cones 6 6' there
are provided apertures or eyes o whereby the length of the bolts e e¹ may be adjusted
as required.
Dated this 12th day of January 1894.

page_text: I, WILHELM VON PITTLER, of 144 High Holborn, in the County of London,
Manufacturer of Universal Machine Tools, do hereby declare the nature of the
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:—
This invention relates to overhead driving gear with friction clutches and more
particularly to an improved arrangement enabling the direction of rotation of the
.shaft to be readily reversed.
In the following description reference will be made to the drawings filed with
the Provisional Specification, in which drawings
Fig. 1 is an end elevation,
Fig. 2 is a vertical section along line A-B of Fig. 1,
Fig. 3 is a horizontal section along line C-D of Fig. 1, and
Fig. 4 a vertical section along line E-F of Fig. 2.
The gearing chiefly comprises a hollow shaft a upon which two stepped cones b¹
are loosely mounted, and a pulley c which is rigidly secured to the said shaft a
between the cones or pulleys b, b' (Fig. 2). The pulley c is encircled by two
rings d d which at one point of their periphery have each a tapered slot (Fig. 4),
in which pins e e¹ adjustable by means of a spindle or bolt fare adapted to engage.
If a single strap be used for reversing motion, there is secured to the bearing or
hanger g a piece h provided with a guide groove ', in which is fitted a pivot i
carrying the guide pulley k. The tension of the strap is controlled by means of a
screw spindle acting on the pivot i, as shown in Fig. 4. The direction of the strap
is as follows:-From the driving pulley to the largest section of the stepped
pulley (Figs. 1 and 3); then over the guide pulley k to the smaller section of the
pulley b and back to the pulley z. Owing to this arrangement of the strap, the
stepped cones b b always turn in opposite directions.
The operation is as follows:-
Into the bore of the shaft a is inserted the bolt or rod f (Fig. 2), on which is
formed a double cone f¹. The pins e and e' removably fitted in the pulley c and
engaging with the tapered slots of the rings d d', slide upon the cones f¹ formed on
the spindle f. By means of the lever the spindle f may be reciprocated, and by
pressing the rod f further into the bore of the shaft a, the bolt e is forced by the
cone into the tapered slot of the ring d, which is thereby carried round along
with the stepped cone b, and consequently sets the pulley c and shaft a also in
rotary motion. By drawing the spindle in the opposite direction, however, the
bolt e is released, and the ring d is disengaged from the wall of the stepped cone b,
while the rod f now forces the other bolt e¹ into the slot of the second ring d', so
that the pulley c, by reason of the connection of the said ring d' with the stepped
cone, receives rotary motion in the opposite direction.
The motion thus produced is conveyed to the machine to be driven through the
medium of a belt pulley m.
The adjustment of the bolts e e' is effected in the following manner; Each of the
said bolts e e¹ consists of two parts, one of which is tapped and the other screw-
threaded externally, one part being screwed into the other, and a counter nut n
being provided to tighten the joint. In the sides of the stepped cones 6 b¹ there
are provided apertures o, through which the length of the bolts ee¹ may be adjusted
as required. Instead of conical heads, the bolts eel may have wedges or equivalent
devices for expanding the internal friction rings and pressing them against the
inside of the stepped pulleys or drums.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is;-
1. An overhead driving and reversing gear comprising in its construction a pair
of pulleys, a pair of split rings adapted to be pressed against the inside of the said
pulleys, a pair of pins or bolts adapted to expand the said rings, and means for
actuating the said bolts or pins through the hollow driving shaft, substantially as
described.
2. An overhead driving gear comprising in its construction a split ring adapted
to be pressed against the inner surface of a pulley or drum by a pin or bolt and a
central spindle adapted to actuate the said bolt or pin through the hollow shaft,
substantially as described.
3. The combination and arrangement of parts constituting the overhead belt
driving and reversing gear, substantially as described and shown.
Dated this 24th day of November 1894.
FAIRFAX & WETTER,
433, Strand, London, Agents.