Improvements in Rivet-making Machines.
Year: 1890

page_text: Date of Application, 22nd Feb., 1890
Complete Specification Left, 22nd Dec., 1890-Accepted, 24th Jan.. 1891
PROVISIONAL SPECIFICATION.
Improvements in Rivet-making Machines.
We, HORATIO FLETCHER, of 5 Sydenham Terrace, Newcastle-on-Tyne, in the
County of Northumberland, Engineer, and THOMAS CRAIG MCFARLANE, of 15 Mather
Street, Newcastle-on-Tyne aforesaid, Rivet Manufacturer, do hereby declare the nature
of this invention to be as follows:-
This invention has reference to rivet making machines of the kind in which the
dies are fitted with removable bottoms (hereinafter called stoppers), by changing
which the machine can be readily adapted to head rivets of different lengths,
each stopper being furnished with a spring intended to prevent its falling out of
the die.
In such a machine it is usual to arrange the dies in a drum with their axes
radial, the length of metal to form each rivet being cut off hot and then allowed to
fall by gravity into a shoot, and thence into one of the dies, after which, by partial
rotation of the drum, the die is brought into position between a bridge or anvil
and a header. After formation of the head a further partial rotation of the drum
brings the die containing the rivet into a horizontal position, and by a forward
motion of a pusher acting at its free end against the inner end of the stopper, forces
the headed rivet out of the die and so on with respect to each die. In this way the
stopper is left at the outer end or mouth of the die, and in order that the length of
metal to form a rivet should be able, of itself, to overcome the resistance offered by
the spring to the movement of the stopper within the die to the reverse or inner end
of the die, so as to admit the length of metal, it has been necessary to make the
springs so weak that they could not be relied upon to prevent the stopper falling out
of the die; hence such a machine as heretofore constructed with such stoppers has
not been found sufficiently reliable for practical use.
Now according to the present invention in order to obviate the evil above referred
to and to enable the stoppers to be held within the dies with sufficient resistance to
endwise movement to effectually prevent their accidentally falling out, a special
pusher is provided in conjunction with means for operating the same at the proper
times so that after a headed rivet has been forced out of a die by the before mentioned
pushed provided for that purpose, and before the die arrives in position to receive a
length of metal to form another rivet, such die is caused to come to rest opposite
the special pusher by a stroke of which the stopper in the die is moved from the
onter end to the inner end or bottom of the die.
With such a machine it might sometimes bappen that the rivet would fail to leave
the die after being headed and would remain in the die until the latter came to rest
opposite the special pusher. To provide for this contingency, there is or are
interposed between the pusher and its holder or actuator a spring or springs adapted
to permit of the forward movement of the said holder or actuator, without correspond-
ing forward movement of the pusher itself, thus preventing breakage of the apparatus
and leaving the rivet to be removed subsequently by hand or by the operation
of the pusher provided for the purpose of removing the headed rivets as before
referred to.
DL: 00. 1
CL1000

page_text: COMPLETE SPECIFICATION.
Improvements in Rivet-making Machines.
We, HORATIO FLETCHER, formerly of 5 Sydenham Terrace, Newcastle-on-Tyne
in the County of Northumberland, but now of Hillside, Crooms Hill, Greenwich, in
the County of Kent, Engineer, and THOMAS CRAIG MOFARLANE, of 15 Mather Street,
Newcastle-on-Tyne aforesaid, Rivet Manufacturer, 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 reference to rivet making machines of the kind in which the dies
are fitted with removable bottoms (hereinafter called stoppers), by changing which
the machine can be readily adapted to head rivets of different lengths, each stopper
being furnished with a spring intended to prevent its falling out of the die.
In such a machine it is usual to arrange the dies in a drum with their axes radial,
the length of metal to form each rivet being cut off hot and then allowed to fall by
gravity into a shoot, and thence into one of the dies, after which, by partial rotation
of the drum, the die is brought into position between a bridge or anvil and a header.
After formation of the head, a further partial rotation of the drum brings the die con-
taining the rivet into a horizontal position, and a forward motion of a pusher acting
at its free end against the inner end of the stopper, forces the headed rivet out of the
die, and so on with respect to each die. In this way the stopper is left at the outer end
or mouth of the die, and in order that the length of metal to form a rivet should be able,
of itself to overcome the resistance offered by the spring to the movement of the stopper
within the die to the reverse or inner end of the die, so as to admit the length of
metal, it has been necessary to make the springs so weak that they could not be relied
upon to prevent the stoppers falling out of the dies; hence such a machine as hereto-
fore constructed with such stoppers has not been found sufficiently reliable for
practical use.
Now according to the present invention in order to obviate the evil above referred
to, and to enable the stoppers to be held within the dies with sufficient resistance to
endwise movement to effectually prevent their accidentally falling out, a pusher,
hereinafter called for distinction a special pusher, is provided in conjunction with
means for operating the same at the proper times, so that after a headed rivet has
been forced out of a die by the before mentioned pusher provided for that purpose,
and before the die arrives in position to receive a length of metal to form another
rivet, such die is caused to come to rest opposite the special pusher by a stroke of
which the stopper in the die is moved from the outer end to the inner end or bottom
of the die.
With such a machine it might sometimes happen that the rivet would fail to leave
the die after being headed and would remain in the die until the latter came to rest
opposite the special pusher. To provide for this contingency, there is or are inter-
posed between the pusher and its holder or actuator a spring or springs adapted to
permit of the forward movement of the said holder or actuator, without corresponding
forward movement of the pusher itself, thus preventing breakage of the apparatus
and leaving the rivet to be removed subsequently by hand or by the operation of
the pusher provided for the purpose of removing the headed rivets as before
referred to.
In the accompanying drawings,
Fig. 1 shows partly in section, and partly in elevation, so much of a rivet making
machine of the kind referred to as is necessary to illustrate the application thereto of
tue special pusher herein before mentioned.
Fig. 2 is a cross section on the line A B of Fig. 1.
Fig. 3 is a partial cross section on the line C D of Fig. 1.
Fix is a stan mutl

page_text: Figs. 5, 6 and 7 show respectively in longitudinal section, cross section and elevation,
to a larger scale, a stopper with retaining spring.
1, 1, are columns for supporting the driving mechanism (not shewn) of the machine.
2,2, are segmental or wedge shaped blocks connected together at the sides by pairs
of links, one of which is shewn at 3, to form a ring or die drum that is supported
upon a saddle or fixed part 4 and dips into water in a trough 5. Each block 2
carries a die 6 fitted with a sliding stopper 7 that normally forms the bottom of the
die. § is a rod that is reciprocated from the driving mechanism of the machine and
carries a finger or projection 9 by which the drum is intermittently rotated to bring
each die 6 in turn between a reciprocating beading tool 10 and a bridge shaped
anvil 11 and afterwards in line with certain pushers hereinafter described. 12 and 13
are pivoted drops or shoots down which metal blanks cut by a movable shear blade 14
from a metal rod 15 fall in regular succession into the dies 6 as they are brought one
by one at the proper times by the step by step rotation of the drum 2, below the
lower edge of the drop 13. 16 is a horizontal pusher which by acting against the
inner end of each stopper as it comes into a horizontal position, forces the stopper
from the inner to the outer end of its corresponding die and thereby ejects the
finished rivet from the die into a shoot 17 whence it falls into a receptacle 17". The
pusher 16 is carried by a cross bar 16 arranged to be reciprocated on guide rods 18
by a link 19, crank arms 20, shaft 21 and rods 22 from the driving mechanism of the
machine.
The construction and operation of the several parts hereinbefore mentioned are well
known and therefore need no further description.
Each stopper 7 is formed with a groove 7 at one side for the reception of a flat
spring 7 (Figs. 5, 6 and 7) whereby it is held within its die 6 with sufficient resistance
to endwise movement to prevent its accidentally falling out. 23 is the special pusher
by which according to this invention each of such stoppers in turn is moved from the
outer end to the inner end or bottom of the die that carries it, after a headed rivet has
been forced out of the die by the pusher 16 and the die has been brought to rest
opposite the special pusher before arriving in position to receive a length of metal
from the drop or shoot 13 to form another rivet. This special pusher 23 is secured to
a rod 24 carried by a tubular holder 25 that is arranged to slide in a radial direction,
with reference to the centre of the drum, in fixed guides 26, 26". The tubular
holder is reciprocated by the bifurcated part 27 of a frame 28 the bifurcated part
extending between collars 25 on the holder 25 as shewn. The frame 28 is provided
with transverse bearing pieces 29 arranged to slide upon the guide bars 18. Suitable
means, such for example as links 19, bell crank levers 20 and rods 22" (shown in
dotted lines in Figs. 1 and 2) driven from the driving mechanism of the machine like
pusher 16, are provided for reciprocating the frame 28 holder 25 and special pusher 23
at the required times, for the purpose herein before mentioned. 30 is a coiled spring
arranged between the pusher rod 24 and the closed end of the holder 25 so as to
permit of forward movement of the holder without a corresponding movement of the
pusher, for the purpose of preventing breakage of the apparatus in the event of a
finished rivet failing to completely leave its die when pushed outward by the
pusher 16.
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. In a rivet making machine of the kind herein referred to in which the stoppers
are held within the dies with sufficient resistance to end wise movement to effectually
prevent their accidentally falling out, a special pusher and means for operating the
same at the proper times, the arrangement being such that after a headed rivet has
been forced out of a die by the ordinary pusher provided for that purpose, and before
the die arrives in position to receive a length of metal to form another rivet, such die
will be brought to rest opposite the special pusher and this pusher will be operated so

page_text: as to move the stopper from the outer end to the inner end or bottom of the die
substantially as herein described.
2. The improved rivet making machine with tightly fitting stoppers and special
pusher arranged and operating substantially as described and shewn.
Dated this 22nd day of December 1890.
HORATIO FLETCHER.
W. Lloyd Wise,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.