AN IMPROVEMENT IN MEANS FOR RIVETTING
Year: 1885

page_text: CHO
I, OLIVER IMRAY of N° 28 Southampton Buildings, Chancery Lane in the
county of Middlesex, Fellow of the Institute of Patent Agents, do hereby declare
the nature of my invention for "AN IMPROVEMENT IN
MEANS FOR RIVETTING" to be as follows:-
THE METHOD OF AND
This invention has for its object to employ for rivetting, plain bolts or pins,
instead of rivets already provided with heads, so that both heads of the rivet are
formed, not by successive operations, but at once. For this purpose, there is
arranged beside the rivetting dies, an abutment at a distance from one of the dies,
corresponding to the length of that portion of the bolt, which is to be compressed
for the formation of one head of the rivet.. Against this abutment the plates to
rivetted together, having the bolt inserted in the hole are held, and when both dies
bear against the ends of the bolt, beginning to spread them and so fixing the rivet
in the hole, the abutment ceases to act.
For applying this invention, in stationary rivetting machines, having a moveable
and a fixed rivetting die, an arm rigidly connected to the standard which carries
the moveable die, projects to within a certain distance of the fixed die.
In rivetting machines having both dies moveable, as for instance in Tweddell's
rivetters, either or each of the two jaws or of the dies carries a short tube con-
taining a moveable bolt, which is caused to project a certain distance beyond the
rivetting die, by a spring or by hydraulic pressure. Or, instead of such a bolt,
there may be a socket surrounding the die and pressed outwards by a spring.
Obviously, the arrangement of bolt or socket may be applied to stationary rivetting
machines, and the fixed arm above referred to may be arranged beside the moveable
die, whilst the bolt or socket is arranged beside the fixed die.
T: 0LL
CL 100K
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.

page_text: An Improvement in the Method of and Means of Rivetting.
I, OLIVER IMRAY of N° 28 Southampton Buildings, Chancery Lane, in the
County of Middlesex, Fellow of the Institute of Patent Agents do hereby declare
the nature of this 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 has for its object to employ for rivetting, plain bolts or pins,
instead of rivets already provided with heads, so that both heads of the rivet are
formed, not by successive operations, but at once. For this purpose, there is
arranged beside the rivetting dies, an abutment or gauging arm at a distance from
one of the dies, corresponding to the length at that portion of the bolt, which is to
be compressed for the formation of one head of the rivet. Against this abutment
the plates to be rivetted together, having the bolt inserted in the hole are held, and
when both dies bear against the ends of the bolt, beginning to spread them and so
fixing the rivet in the hole, the abutment ceases to act.
In the Specification to former Letters Patent No 14471 a similar method of
forming two heads simultaneously upon a rivet by the aid of an abutment was
described, but in that case the abutment was moveable so as to maintain the plates
always in the middle of the rivet blank during the heading operation.
It has since been found that such motion of the abutment is unnecessary, as the
blank is sufficiently jumped or swelled out on each side of the plates as soon as the
pressure is applied, to maintain the plates in proper position thereon. Here it is
to be remarked that 'in certain cases the two heads of a rivet are required to be of
different sizes, and that in such cases the material of the pin or bolt ought to be
proportionally distributed on both sides of the plates.
In the annexed sheet of drawings Figs. 1, 2, and 3 shew the arrangement of the
said abutment or gauging arm in a stationary hydraulic rivetting machine; Figs. 5,
6,7 and 8 represent the application of the device to transportable riveting machines;
Fig. 9 shews a modified form of the gauging arm, which may be used in connection
with rivetting machines of any kind. In stationary hydraulic rivetting machines
the gauging arm a is screwed into the upright a, which carries the piston k having
the moveable rivetting die n fastened to it; for the sake of clearness, the arm 8 is
shewn beneath the rivetting die, while in practice it is arranged by its side.
As indicated in Fig. 3, the end of the gauging arm is placed at a known distance d
from the fixed rivetting die n¹. If a be the thickness of the plates to be rivetted,
and and the lengths of the portions of the pin or bolt out of which the two
heads are to be made, then d
= 8 + 11
At the beginning of the operation, the
plates b to be rivetted are applied against the arm 8, after which the rivetting die n
advances, thereby displacing the pin or bolt b, in the holes of the plates b until the
said pin or bolt bears against the fixed rivetting die n. At this moment the desired
distribution of the material of the pin on each side of the plate should be accom-
plished, and by the further advance of the die n the pin is jumped and the heads
of the rivet are formed.

page_text: In Tweddells suspended hydraulic rivetting machine, both dies are moveable
and consequently the described gauging device cannot be applied to the same. In
rivetting machines of this kind, the gauging arm or bar 8 is enclosed in a short
tube or socket h, which is fastened to one jaw m of the machine, as shewn in
Figs. 4, 5, 6 and 7. By means of a coiled spring f, as shewn in the drawings, or
by bydraulic pressure, the collar s¹ of the gauging bar 8 is held on to the holed
bottom of the socket h, when the end of the bar 8 overtops the rivetting die, as far
as is required for the desired gauging of the material. In this case also, the pin or
bolt b, after the plates P to be rivetted have been applied without pressure to the
gauging bar, is displaced in the holes of the said plates by the approach of the jaws
towards each other, and at the moment when both ends of the pin or bolt have
come in contact with the riveting dies, jumping begins and the gauging bar a ia
forced back, its spring f being compressed. If the gauging bars be maintained in
position by hydraulic pressure, the water under pressure flows back from the
socket h into its conduit while the bar recedes.
As shewn in Figs. 7 and 8, the socket h containing the gauging bar s may be
made in one piece with the die n; but in this case, the matrix proper m², which is
liable to wear, is made as a separate piece, adapted to be inserted into the die and
fixed therein by means of a screw m³.
In the modified form of the gauging device shewn by Fig. 9, the bar or arm 8,
held in position by a coiled spring, is replaced by a socket p, enclosing the rivetting
die n and either having its bottom portion formed into a coiled spring p, or being
supported by such a spring; a shoulder q of the rivetting die serves as an abutment
or support to the spring.
Obviously, the gauging device hereinbefore described as applied to Tweddell's
suspended rivetting machine may also be used in connection with stationary
rivetting machines. Furthermore, in order to prevent lateral displacements of the
plates to be rivetted, both dies of rivetting machines of any description may be
provided with the gauging devices consisting of the bar s and spring f, or of the
socket p and spring p¹, and in stationary rivetting machines, the gauging arm 8 as
described with reference to Figs. 1, 2 and 3 may be arranged near the moveable
die, while any of the other distributing devices is connected to the fixed die.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1. The method substantially as herein described of simultaneously forming both
heads of a rivet in rivetting machines, whereby the plates to be rivetted are in the
first instance brought up against a stationary abutment or gauging arm, so arranged
relatively to the rivetting dies that the rivet blank has its material distributed on
each side of the plates in proportion to the size of the heads to be formed, and that
the abutment ceases to act as soon as both ends of the rivet blank have come in
contact with the rivetting dies.
2. In stationary rivetting machines operating as set forth in the previous claim,
the use of a gauging arm a fixed to the framing a that carries the moveable
rivetting die n and having its extremity at a fixed distance from the fixed die n¹
substantially as herein described.
3. In rivetting machines of any description operating as set forth in the first
claim, the use of a gauge or abutment 8 held in position in a socket h by means of
a spring for by hydraulic pressure so as to be capable of yielding, when the
rivetting pressure is applied, the said gauge or abutment being applied either to
one or to both of the rivetting dies, substantially as herein described.
4. In rivetting machines of any description operating as set forth in the first
claim, the use of a socket p enclosing one or both dies and held in position by a
coiled spring p', substantially as herein described.

page_text: 5. In stationary rivetting machines, operating as set forth in the first claim, the
use in combination with a fixed abutment or gauge s situated near the moveable
die, of an abutment or gauge with spring action situated near the fixed die, arranged
and operating substantially as herein described with reference to Figs. 4 to 9 of
the drawings.