IMPROVEMENTS IN APPARATUS FOR RAISING LOWERING AND DIRECTING PROVISIONAL SPECIFICATION
Year: 1882

page_text: LETTERS PATENT to Ralph Hart Tweddell of No 14 Delahay Street
Westminster in the County of Middlesex and John Fielding of the Atlas
Works Gloucester in the County of Gloucester for an Invention of
IMPROVEMENTS IN APPARATUS FOR RAISING LOWERING AND DIRECTING
PROVISIONAL SPECIFICATION left by the said Ralph Hart Tweddell and
John Fielding at the Office of the Commissioners of Patents on the
28th September 1882.
RALPH HART TWEDDELL of N° 14 Delahay Street Westminster in the County
of Middlesex and JOHN FIELDING of the Atlas Works Gloucester in the County
of Gloucester "IMPROVEMENTS IN APPARATUS. FOR RAISING LOWERING AND
DIRECTING PORTABLE RIVETTING MACHINES AND THE LIKE
"
When portable rivetting machines and the like are employed in the construction
of iron vessels, bridges and other structures, it is necessary to raise and lower them
and to move them into different attitudes so as to direct their tools on the various
parts of the work which they have to perform. Our invention relates to the con-
struction and arrangement of apparatus for supporting and altering the level and
direction of such machines, the chief object which we have in view being to arrange
this apparatus in a compact form at or on the machine itself its movements being
under the control of the person working the machine. At some convenient part
of the framing of the machine we provide a trunnion having its axis in a line
preferably passing through the centre of gravity of the machine and on this
trunnion we fit a bent radial arm terminating in a pin the axis of which is also in
a line passing through the centre of gravity in the plane of the axis of the trunnion
but inclined to it at an angle of about 45°. On this pin we fit a second arm that can
turn on it as an axis. On this arm we fix a hydraulic cylinder with its plunger
having a chain or chains passing round pullies on it and on the arm and led up

page_text: from one of these pullies to some convenient point of suspension. By admitting
water under pressure to the hydraulic cylinder or permitting water to be discharged
therefrom the chain is drawn in or slacked out and thus the machine is raised or
lowered, and by turning the machine on its trunnion and turning the radial arm
relatively to the second arm the machine can be directed into various attitudes so
as to bring its tools into suitable relation to their work. The plunger of the
hydraulic cylinder may have multiplying pullies so that a comparatively small
stroke of the plunger may take up or let out a considerable length of chain. Also
the hydraulic cylinder instead of being fixed on the arm as above described may be
fixed on the machine itself or on the radial arm the chain being led from it by guide
pullies to and along the arm or led direct to the point of suspension, the second arm
being in that case dispensed with. The hydraulic cylinder may be itself suspended
by a bracket projecting from its side so as to bring the point of suspension over the
centre of gravity of the machine, the hydraulic plunger being in that case made
with an eye in which the trunnion can work.
In some cases we connect the two arms by gearing to one another and to the
framing of the machine so that when the machine makes a partial revolution round
the axis of its trunnion the trunnion itself with the machine revolves partly round
the point of suspension of the second arm.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Ralph Hart Tweddell and John Fielding in the Great Seal Patent
Office on the 27th March 1883.
RALPH HART TWEDDELL of N° 14 Delahay Street Westminster in the County
of Middlesex and JOHN FIELDING of the Atlas Works Gloucester in the County of
Gloucester "IMPROVEMENTS IN APPARATUS FOR RAISING, LOWERING AND DIRECTING
PORTABLE RIVETTING MACHINES. AND THE LIKE
"
When portable rivetting machines and the like are employed in the construction
of iron vessels, bridges and other structures, it is necessary to raise and lower them
and to move them into different attitudes so as to direct their tools on the various
parts of the work which they have to perform. Our invention relates to the con-
struction and arrangement of apparatus for supporting and altering the level and
direction of such machines, the chief object which we have in view being to arrange
this apparatus in a compact form at or on the machine itself, its movements being
under the control of the person working the machine. At some convenient part of
the framing of the machine, we provide a trunnion having its axis in a line pre-
ferably passing through the centre of gravity of the machine, and on this trunnion,
we fit a bent radial arm terminating in a pin, the axis of which is also in a line
passing through the centre of gravity in the plane of the axis of the trunnion, but
inclined to it at an angle of about 45°. On this pin, we fit a second arm that can
turn on it as an axis. On this arm we fix a hydraulic cylinder with its plunger
having a chain or chains passing round pullies on it and on the arm, and led up
from one of these pullies to some convenient point of suspension. By admitting
water under pressure to the hydraulic cylinder, or permitting water to be discharged
therefrom, the chain is drawn in or slacked out and thus the machine is raised or
lowered, and by turning the machine on its trunnion and turning the radial arm
relatively to the second arm, the machine can be directed into various attitudes so
as to bring its tools into suitable relation to their work. The plunger of the
hydraulic cylinder may have multiplying pullies, so that a comparatively small
stroke of the plunger may take up or let out a considerable length of. chain. Also
the hydraulic cylinder, instead of being fixed on the arm as above described, may
be fixed on the machine itself or on the radial arm, the chain being led from it by
guide pullies to and along the arm, or led direct to the point of suspension, the
second arm being, in that case, dispensed with. The hydraulic cylinder may be
itself suspended by a bracket projecting from its side, so as to bring the point of
suspension over the centre of gravity of the machine, the hydraulic plunger being,.
in that case, made with an eye in which the trunnion can work.
In some cases, we connect the two arms by gearing to one another and to the
framing of the machine, so that when the machine makes a partial revolution round
the axis of its trunnion, the trunnion itself with the machine revolves partly round
the point of suspension of the second arm.
DESCRIPTION OF THE DRAWINGS.
Figs. 1 and 2 are side elevations of a portable hydraulic rivetting machine
shewn suspended in two different attitudes by apparatus according to our inven
tion: A is the trunnion projecting from the framing of the machine with its axis
nearly in a line passing through the centre of gravity; B is the bent radial arm
having at its end a bearing for the pin C, the axis of which is also nearly in a line
passing through the centre of gravity and is inclined at nearly 45° to the axis of

page_text: the trunnion A. The pin C is a trunnion of the hydraulic cylinder D, the plunger E
of which carries a pulley for the chain F that passes round a guide pulley G
mounted on the end of the cylinder D and extends up to the point of suspension.
The cylinder D is provided with a valve box H having supply and discharge valves
which can be worked by cords attached to the valve levers I I. By means of these
valves the plunger E can be subjected to hydraulic pressure or relieved therefrom.
In the one case, the chain F is drawn upon and the rivetting machine is raised, in
the other case the chain is let out and the machine is lowered. When a considerable
range of ascent and descent is required, the cylinder D and plunger E may be
provided with compound or multiplying pullies as in hydraulic cranes.
Figs. 3, 4, 5 and 6 are views of a hydraulic rivetter turned to various attitudes
on double trunnions A and C arranged relatively to the machine and to each other
as described above, with gearing by which, when required; the movements round
the two axes of motion A and C can be coupled. In these figures we have not
shewn the hydraulic cylinder and chain for raising or lowering the machine, as it
may be separate, the chain from it or from a crane or other hoist taking hold of
the machine by the eye K. Or the arm P may be made as a hydraulic cylinder as
described with reference to Figs. 1 and 2. The gearing connecting the two axes
of movement A and C consists of a toothed segment L fixed on the body of the
machine and gearing with a pinion M having its axis mounted in the radial arm;
on the axis of M is a bevil' pinion N, which can be slid into or out of gear with a
bevil segment O fixed on the suspending arm P. On turning a worm which
gears with the pinion M the machine can be made to revolve round the axis of A,
and if the pinion N be in gear with O, the whole can be turned round the
axis of C.
T
wn in Figs. 7 and 8.
lift described in the
) N° 4609, with the
In cases where the machine requires to be turned only into planes, the trunnion
A may be jointed directly to the hydraulic cylinder D as
The cylinder D may in this case be made as the telesco
Specification to Letters Patent dated the 10th November"
addition of a guide rod R, the lift being so arranged that t e liquid that works
the machine itself passes through it. The telescopic lift is attached to a bracket S
projecting laterally from the suspending trunnion T, so as to bring the centre of
gravity of the machine vertically under the point of suspension.
Having thus described the nature of our invention and in what manner the same
is to be performed, we claim as means of raising, lowering and directing portable
rivetting machines and the like:
First. The combination of two arms such as D and B or P and B (Figs. 1 and 2, or
Figs 3, 4, 5 and 6) jointed to each other and to the machine by pins or
trunnions having their axes arranged substantially as herein described.
Second. In combination with the jointed arms, a bydraulic cylinder D with plunger
and chain (Figs. 1 and 2), substantially as and for the purpose herein set
forth.
Third. In combination with the jointed arms, gearing for coupling the movements
round the two axes of motion, substantially as herein described with reference
to Figs 3, 4, 5 and 6.
Fourth. Connecting the machine by its trunnion to a telescopic lift, substantially as
described with reference to Figs. 7 and 8.
In Witness whereof, I the said Ralph Hart Tweddell have hereunto set my
hand and seal this Twenty First day of March in the year of our Lord one
thousand eight hundred' and eighty three.
RALPH HART TWEDDELL. (L.S.)