IMPROVEMENTS IN DRIVING GEAR FOR TOGGLE PRESSES
Year: 1877

page_text: LETTERS PATENT to Francis William Crossley and William John Crossley,
both of Great Marlborough Street, Manchester, in the County of Lancaster, for
the Invention of "IMPROVEMENTS IN DRIVING GEAR FOR TOGGLE PRESSES."
S304 110777
9 LL
1077
PROVISIONAL SPECIFICATION left by the said Francis William Crossley,
and William John Crossley at the Office of the Commissioners of Patents on
the 5th February 1877.
FRANCIS WILLIAM CROSSLEY and WILLIAM JOHN CROSSLEY, both of Great
Marlborough Street, Manchester, in the County of Lancaster. "IMPROVEMENTS IN
DRIVING GEAR FOR TOGGLE PRESSES.”
Our Invention relates to means for driving the screws of toggle presses of the
kind described in the Specifications to Patents granted to G. Haseltine on the 23rd
November 1872, No. 3510, and to G. B. Booiner on the 12th September 1873,
No. 3003. In such presses the horizontal screw while it is caused to revolve has
also to move vertically at half the speed of the follower, and in consequence of this
change of position it is necessary when the screw has to be driven from a prime
moving shaft to provide gearing of such a kind that the screw is followed in its
vertical movement by part of the gearing, while that part which receives motion
from an extraneous source remains stationary in position. For this purpose we
mount in stationary bearings near the head of the press a prime shaft which
receives rotary motion by a strap or otherwise, and on this shaft we fix a wheel or
pinion which gears with an intermediate wheel that gears also with a pinion or
wheel fixed on the press screw. The intermediate wheel revolves on an axis which
forms the joint of two radius arms, the one of which is pivotted on the prime shaft
and the other on the press screw. As the screw ascends or descends these arms are
moved partly round on their pivotted ends and on their common joint, while they
always keep the intermediate wheel in gear with both the wheels or pinions.
According to another construction we drive from the prime shaft by means of
bevil gearing a vertical shaft, which is mounted on a step bearing on the press
screw and slides up and down with it through the bevil wheel by which it is
driven, being fitted thereto by a feather and keyway so that it can slide through

page_text: it whilst it must revolve with it. This vertical shaft by means of bevil gearing
drives the press screw.
In both constructions the proportions of the gearing may be varied as desired
for different speeding, and the prime shaft may be provided with a clutch and
reversing gear of any known kind, so that the press screw can be stopped or driven
in either direction.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Francis William Crossley and William John Crossley in the Great
Seal Patent Office on the 3rd August 1877.
FRANCIS WILLIAM CROSSLEY and WILLIAM JOHN CROSSLEY, both of Great
Marlborough Street, Manchester, in the County of Lancaster.
"IMPROVEMENTS IN
DRIVING GEAR FOR TOGGLE PRESSES."
Our Invention relates to means for driving the screws of toggle presses of the
kind described in the Specifications to Patents granted to G. Haseltine on the 23rd
November 1872, No. 3510, and to Ġ. B. Boomer on the 12th September 1873,
No. 3003. In such presses the horizontal screw while it is caused to revolve has
also to move vertically at half the speed of the follower, and in consequence of this
change of position it is necessary when the screw has to be driven from a prime
moving shaft to provide gearing of such a kind that the screw is followed in its
vertical movement by part of the gearing, while that part which receives motion
from an extraneous source remains stationary in position. For this purpose wo
mount in stationary bearings near the head of the press a prime shaft, which
receives rotary motion by a strap or otherwise, and on this shaft we fix a wheel
or pinion which gears with an intermediate wheel that gears also with a pinion or
wheel fixed on the press screw. The intermediate wheel revolves on an axis which
forms the joint of two radius arms, the one of which is pivotted on the prime shaft
and the other on the press screw. As the screw ascends or descends these arms are
moved partly round on their pivotted ends and on their common joint, while they
always keep the intermediate wheel in gear with both the wheels or pinions.
According to another construction we drive from the prime shaft by means of
bevil gearing a vertical shaft, which is mounted on a step bearing on the press
screw and slides up and down with it through the bevil wheel by which it is
driven, being fitted thereto by a feather and keyway so that it can slide through it
whilst it must revolve with it. This vertical shaft by means of bevil gearing drives
the press screw.
In both constructions the proportions of the gearing may be varied as desired
for different speeding, and the prime shaft may be provided with a clutch and
reversing gear of any known kind, so that the press screw can be stopped or driven
in either direction.
Fig. 1 represents a side view, and Fig. 2 an end view of a toggle press with
one arrangement, according to our Invention of gear, for driving the screw of the
toggles.
A is the main driving shaft which is caused to revolve in stationary bearings a, a,
on the head framing of the press being provided by preference with two pairs of 4
fast and loose pullies B and C for varying speed, reversing, and stopping; D is the
screw which works the toggles E in the usual way, having to move upwards and
downwards along with their middle joints; F is a countershaft, the bearings of
which are the eyes of radius rods G jointed on the prime shaft A and of radius.
rods H jointed on the screw D. On the shaft F' is a toothed wheel K, which gears 5
with a pinion L on the prime shaft A and also with a wheel M on the screw shaft D.

page_text: The radius rods G and H. permit of the up-and-down movement of the screw D
and its wheel M, whilst they koop the intermediate wheel K always truly in gear
with the driving pinion L and the driven wheel M.
Fig. 3 represents a side view, and Fig. 4 an end view of a toggle press with
another arrangement, according to our Invention, for gearing the rising and descend-
ing toggle screw to a driving shaft mounted in stationary bearings. In this case
the prime shaft A by means of a bevel pinion L drives a bevil wheel K which is
fitted with a feather on a vertical shaft F, so that the shaft can slide through the
boss of K but must revolve with it. The shaft F by the bevil gear M drives the
screw shaft D which works the toggles E in the usual way, rising or descending
along with their middle joints, the gearing M and shaft F moving up or down with
the screw.
Having thus described the nature of our Invention, and in what manner the
same is to be performed, we claim,―
First. Working the screw of a toggle press by an intermediate wheel kept in
goar with a wheel on the screw shaft and with a pinion on the prime shaft by
incans of radius rods, permitting the vertical movement of the screw while the
prime shaft revolves in stationary bearings, substantially as herein described with
reference to Figs. 1 and 2 of the accompanying.Drawings.
Second. Working the screw of a toggle press by bevil gear from a vertical shaft
fitted to slide through while it revolves with a bevil wheel worked from the prime
shaft, so as to permit of the vertical movement of the screw while the prime shaft
revolves in stationary bearings, substantially as herein described with reference to
Figs. 3 and 4 of the accompanying Drawings.
In witness whereof, I, the said Francis William Crossley, have hereunto set
my hand and seal, this First day of August, in the year of our Lord One
thousand eight hundred and seventy-seven.
FRANCIS WILLIAM CROSSLEY. (L.S.)