Im- PROVEMENTS IN MACHINERY FOR MAKING BOLTS, SPIKES, AND RIVETS
Year: 1874

page_text: LETTERS PATENT to Benjamin Marsden, of Manchester, in the County
of Lancaster, Screw Bolt Manufacturer, for the Invention of "Im-
PROVEMENTS IN MACHINERY FOR MAKING BOLTS, SPIKES, AND RIVETS."
PROVISIONAL SPECIFICATION left by the said Benjamin Marsden at
the Office of the Commissioners of Patents, with his Petition, on
the 24th April 1874.
I, BENJAMIN MARSDEN, of Manchester, in the County of Lancaster,
Screw Bolt Manufacturer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN MACHINERY FOR MAKING BOLTS, SPIKES, AND
RIVETS," to be as follows:-
:―
My Invention relates, firstly, to bolt, spike, or rivet making machines
which are provided with apparatus for "bunting" the rod of metal,
which process as is well known consists in partially forming the head,
which is subsequently finished in the same dies or while held in another
die or dies.

page_text: According to my Invention I form the bunting die or dies with a
recess of increased diameter next to that face thereof whereon the
bunting operation takes place, whereby an increased cavity is formed
for the reception of the metal. The bolt, spike, or rivet thus partially
formed is then placed in the ordinary finishing dic or dies but with the 5
enlarged part produced by the aforesaid cavity on the outside of the said
die or dies, and the usual header then drives the said enlarged part into
the ordinary shank part of the die or dies and forms the completed head
and neck.
Another part of my Invention relates to a method of opening and
closing the dies of bolt, spike, and rivet machines. For this purpose I
employ a rod formed in two parts, one of them capable of sliding upon
the other against the elastic force of a spring. This rod by moving acts
by elastic force upon a cam, which by being thus turned closes the dies;
the opening thereof is effected by a pin and slot connection of the said
rod and cam. Or in place of the cam a wedge may be employed formed
on the sliding part of the rod.
In order to lighton the friation of the com
SPECIFICATION in pursuance of the conditions of the Letters Patent, 2
filed by the said Benjamin Marsden in the Great Seal Patent Office
on the 24th October 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, BENJAMIN
MARSDEN, of Manchester, in the County of Lancaster, Screw Bolt
Manufacturer, send greeting.
2
☐ WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent bearing date the Twenty-fourth day of April One
thousand eight hundred and seventy-four, in the thirty-seventh year of
Her reign, did, for Herself, Her heirs, and successors, give and grant
unto me, the said Benjamin Marsden, Her special license that I, the 3
said Benjamin Marsden, my executors, administrators, and assigns, or
such others as I, the said Benjamin Marsden, my executors, admini-
strators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term therein

page_text: bolt is now taken to the ordinary finishing dies, which are as is well
known square in form, and it is placed therein as shewn at Figs. 4, 5, 6,
the shank 7 resting loosely in the square and the enlarged part 8 being
situate outside the dies 9; the heading die now advances and commences
to press the bunted part 10, the first effect of which is that the part 8 is
thrust into the square of the dies, the segments of metal 11, 12, 13, 14,
being the only parts necessary to be stripped off for that purpose, and
this having been done the continued advance of the ram completes the
form of the head, as shewn at Fig. 7. By these means I obviate in great
measure the formation of a fin beneath the bolt head, which frequently
takes place when the bunting is effected in the ordinary manner, and
lessen the danger of pulling up or breaking the machine.
The next part of my Invention is shewn at Fig. 8, 9, the former being
a partial plan view of a bolt making machine, and the latter a partial
section. At 14 is the moveable die either turning upon a centre or
sliding in guides as usual, and at 15 is a roller mounted thereon; at 16 is
the bar for closing the die by means of the wedge-shaped part 17; this
bar rests on the bed 18, and is secured to the sliding ram 19 by means
of nuts 20, the part 16* of the said bar being round, and thus providing
a shoulder 21 which is drawn against the face of the ram by the said
nuts 20; the outside of the bar 16 is in contact with a plate 22 situate
in a recess 23 formed in the bed, and behind this plate are spiral springs
24 situate in a recess 25. As the ram 19 advances it carries forward the
bar 16, and the wedge 17 arriving in contact with the roller 15 closes
the die; but if it should happen from any cause that an undue resistance
to the advance of the said wedge takes place then the plate 22 will be
forced back against the pressure of the springs 24 and thus avoid damage
to the working parts.
Fig. 10 represents a modification of this part of my Invention. At
16 is the bar with its wedge, but in this instance the part 16* thereof
projects into a recess 26 and is capable of sliding therein against the
force of a spiral spring 27 which gives way as before when undue
resistance takes place; the recess 26 is closed by a cap 28 which enables
the ram to draw back the wedge 17. The two arrangements of yielding
connexion may be combined if desired.
In the above description I have spoken particularly of the manu-
facture of what are commonly called bolts, but other articles such as
spikes or rivets may be made according to my Invention.

page_text: Having thus described and ascertained the nature of my said Inven-
tion, and the manner in which the same is to performed, I desire it
to be understood that I claim as secured to me under the above in part
recited Letters Patent and for the purposes above set forth,-
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