Improvements in Rivetting Machines.
Year: 1891

page_text: Date of Application, 23rd June, 1891-Accepted, 15th Aug., 1891
COMPLETE SPECIFICATION.
Improvements in Rivetting Machines.
I, JAMES YATE JOHNSON of 47 Lincoln's Inn Fields in the County of Middlesex,
Gentleman, do hereby declare the nature of this invention which has been
communicated to me from abroad by William Sellers of the City and County
of Philadelphia in the State of Pennsylvania, United States of America, Engineer,
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
This invention has for its object to provide a machine more particularly adapted
to rivetting the flange of a pipe or tube to a corresponding surface on another pipe
or tube, or to the plating of any vessel, especially in cases where a series of tubes
in close proximity must be rivetted to a vessel common to all, and as this latter
condition is found in the Galloway Boiler, the drawings accompanying this Specifi-
cation represent the machine as operating upon such tubes, which heretofore have
always been rivetted in place by hand.
This said invention consists in providing a rivetting die and a holder mounted
respectively upon a circular table rotatable about the, axis of a tube, one or both
of which tables is or are provided with an opening in the periphery through, which
the tube can pass when its axis is parallel to the axis of rotation. It further
consists in rotating the circular table through which the tube must pass, by means
of two gear wheels, so far removed from each other on the periphery of the table,
that the opening through it for the tube, cannot cut off the connection with both
gear wheels at the same time. It further consists in providing two levers of the
third order with a rotatable table upon one end of each and a fulcrum common to
both at the other end and so gearing these tables together that their rotatory
movements must be concurrent. It further consists in mounting the circular tables
upon two levers of the third order, having a fulcrum common to both, of such
length, that in whatever position the rivetting die and the holder may be; the line
of strain, in driving the rivet, must always fall within this fulcrum.
The more fully to explain this invention reference is made to the accompanying
drawings in which
Figure 1 represents a side elevation of a rivetting machine constructed according
to this invention,
Figure 2 is a plan of the same with the valve case and stand removed,
Figure 3 is a sectional view of Figure 1, and
Figure 4 is a plan of the lower lever in Figures 1 and 3
similar letters refer to the same parts.
In all of the figures
The rivetting die and the holder are alike, but for convenience of description, I
will call the lower die a, the rivetting die, which makes the upper one b the holder,
in their operation rests upon the rivet head; and a moves towards to close the
rivet. The rivetting die a is supported in the circular table A, the upper flange of
which rests upon the end of a lever of the third order B, and a hub under this flange,
is fitted to a hole in the lever so that it will turn freely therein. An opening
through this table and hub is provided, large enough to admit the tube to be
operated upon freely, an opening from this hole through to its periphery is made,
wide enough for the tube to pass through and an opening of corresponding width is
made in the end of the lever B, so that by raising the tube or lowering the lever,
the tube when in the position shewn in Figure 3, can pass freely into the centre of
the circular table A. The shape of the hole in the circular table, and of its
opening to the periphery of the table, as also of the opening in the end of the
lever B are shewn in Figure 4. It will be observed that the opening in the end of
the lever B is not so large as the hub under the circular table A, so that this

page_text: table is held securely in its position by the hub, while it is free to rotate about its
axis. The distance from the centre of the rivetting die a to the centre of the
circular table A, corresponds with the radius of the circle of rivets, which is to be
driven in the upper or large end of the tube, shewn in Figure 3. When the flange
on the small end of this tube is to be rivetted, the circular table A is removed, and
another similar one is put in its place, in which the distance of the rivetting die a
from the centre of the table corresponds with the radius of the circle of rivets in
the smaller flange. The periphery of the circular table A is provided with teeth
with which the teeth of the pinions C and D engage, and these two pinions are
geared together by the pinion E. The distance between the pinions C and D is
such, that when the opening in the periphery of A, is turned to the pinions, one or
the other pinion must always be in gear with the teeth of the circular table so
that this table can always be turned by rotating the pinion E. The circular
table F in the upper lever G and the lever itself, which is also of the third order,
are arranged in the same manner as the table A and lever B. The table F is
turned about its axis by gearing similar to that on lever B, and in like manner, but
as the flange of the circular table F, is on the underside of the lever G, provision
is made for holding up this table, by a circular ring H, which is bolted to the hub
on the upper side of the table F. Provision is made for rotating the pinion E and
table A by means of the vertical shaft c, bevel wheels d and e and the shaft I, and
similar provision is made for rotating the table F by means of the vertical shaft f
and bevel wheels y and h and the shaft K. The shafts I and K are geared together
by the train of wheels L. M. N. O, which pass through the fulcrum pin P that
unites the levers B and G by a hinged joint and so geared, the rotation of the two
circular tables must be concurrent, and the relative position of the rivetting die a
and the holder b in their circular path must always be the same. The fulcrum
pin P and the hinged joint are made so long that in whatever position the rivetting
die and the holder may be in their circular path, the line of strain in driving
rivet will always fall within this fulcrum pin so as thereby to avoid the distortion
of the hinged joint. Provision for turning the shafts I and K is made by the
socket wrench Q which fits upon either shaft, and is held in position by the
bearing R, which is bolted to the lower lever B, and by the bearing S which is
bolted to the upper lever G. The wrench Q is transferable from one shaft to the
other to suit the character of work as for example, in rivetting the top flange on
the large end of the tube, the wrench must be placed on the shaft I which is above
the flue as shewn in Figure 3 but in rivetting the bottom flange, on the small end of
the tube the shaft I would be within the tube and the wrench could be operated
only in connection with the shaft K which would then be underneath the flue.
Provision for operating the levers B and G is afforded by the hydraulic cylinder T,
plunger U and crosshead V connected with the upper lever G. and the eye bolts kk
which are secured to the crosshead V by the adjustable nuts lll and to the lower
lever B by the pin m which passes through this lever, and the eyes on the bolts k k.
High pressure water is admitted to and discharged from the cylinder T, through
the bent pipe J, which connects this cylinder with the valve case W. This valve
case is mounted upon the stand X which is bolted upon the top of the upper
lever G.
a
The stem n of the valve in the case W, is connected through the lever o and
link P to the hand lever Y which latter has its fulcrum q in the top of the stand X.
The whole apparatus is suspended at any convenient height by chains rr secured
to the pin ss which passes through the under side of the upper lever, G as nearly as
possible in the centre of gravity of the whole mass.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed Ị declare that what I
claim is.
1st. A rivetting machine provided with a rivetting die and a holder mounted
respectively upon circular tables rotatable about the axis of a tube, one or both of

page_text: which are provided with an opening in the periphery through which the tube can
pass substantially as hereinbefore described.
2nd. In a rivetting machine a circular table provided with an opening through
its periphery substantially as described in combination with two gear wheels which
engage with teeth on the periphery of the table, and so far removed from each
other around this periphery that the opening through it cannot cut off the connection
with both gear wheels at the same time.
3rd. In a rivetting machine two levers of the third order cach provided with a
rotatable table upon one end and a fulcrum, common to both at the other end, where
these tables are so geared that their rotatory movements are concurrent.
4th. In a rivetting machine, a rivetting die and a holder mounted on rotatable
tables upon the ends of two levers of the third order having a fulcrum common to
both, of such length that the line of strain in driving a rivet must always fall
within this fulcrum substantially as hereinbefore described.
5th. The arrangement and combination of parts constituting the rivetting
machine substantially as hereinbefore described and illustrated in the accompanying
drawings.
Data 1 09.11.
1001
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.