IMPROVEMENTS IN MACHINERY FOR THE MANUFACTURE OF BOLTS SPIKES RIVETS NAILS AND OTHER LIKE ARTICLES
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Thomas Jeavons at the Office of the
Commissioners of Patents on the 14th April 1883. Communicated to him
from abroad by William Taylor of Pittsburg Pennsylvania United States of
America late of Birmingham aforesaid Machinist
"
THOMAS JEAVONS of Birmingham in the County of Warwick Manager of
Works "IMPROVEMENTS IN MACHINERY FOR THE MANUFACTURE OF BOLTS SPIKES
RIVETS NAILS AND OTHER LIKE ARTICLES [communicated to him from abroad
by William Taylor of Pittsburg Pennsylvania United States of America late of
Birmingham aforesaid Machinist]
The said Invention has reference to machinery for the manufacture of bolts
spikes rivets nails and other like articles from rods of iron or other metal the roḍ
being automatically and intermittently fed into the machine and griped or held
while a head is being formed thereon by the action of a heading tool or ram and
the headed length afterwards separated from the rod and pointed.
The improvements constituting the said invention consist essentially of the
construction and combination herein after described of the parts of the feeder or
feeding device also of the mechanism hereinafter described for holding back the
heading ram while the rod is fed forward and seized by the griping dies also of
the mechanism hereinafter described whereby the heading ram may be stopped
and controlled and released without affecting the movements of the other parts of
the machine and further of the construction and combination of parts for operating
the feeder and the griping cutting off and pointing dies of the machinery.
The feeder or feeding device consists of a pair of tongs or bent levers jointed
together near their middle one end of the tongs closing when the other end is
forced open and the reverse. Two short links are pivoted to one end of the tongs
and the free ends of the tongs are provided with bevil edged teeth. The opposite
ends of the links to those which are pivoted to the tongs are pivotted by a single
pin to a post carried by a small "tablet or slide to which a vibrating horizontal
arm is connected the said arm being worked by a connecting rod and crank pin
from the main shaft of the machine. The "tablet" supporting the post to which
the short links are jointed is dovetailed into and made to slide with and upon a
large rectangular dovetail base plate carrying two uprights between which the
feed tongs are pivoted. The dovetail base plate described has a to and fro or
reciprocating motion given to it on each revolution of the driving shaft. When

page_text: the horizontal vibrating arm is moved towards the body of the machine it first
moves the post carrying the links thereby opening the said links and causing the
teeth of the tongs to close upon and grip the rod to be fed into the machine. The
rod being thus-held the further motion of the vibrating arm advances the links
and tongs and feeds forward a length of rod into a die box and between a pair of
griping dies and the cutting off and pointing dies After the griping dies have
closed upon the rod so as to hold it firmly during the heading operation a back
motion is given to the vibrating arm and the tongs are first opened so as to release
the rod and afterwards returned to their first position ready to feed forward
another length of rod. In this way an intermittent feed motion is given to
the rod.
The griping dies are situated in the same line on opposite sides of the rod being
fed and the said dies are forced outwards and apart by a coiled spring around
them and are advanced towards each other so as to grip the rod between them by
means of sliding bars acted upon by secondary bars at right angles the latter bars
being worked by single throw cams on the main shaft.
Within the die box and in advance of the griping dies the acting ends of the
pointing and cutting off tools work Three pointing and cutting off tools are used
two working in a borizontal plane and the third in a vertical plane. The two
horizontal tools together constitute three sides of a tapering die box and the
vertical tool the fourth side. The two horizontal tools are worked from the main
shaft in the manner described with respect to the griping dies but the third or
vertical tool is worked by a lever operated by a cam on the main shaft.
The heading mechanism consists of a horizontal heading ram provided with
parallel rods having around them strong coiled springs by the expansion of which
the blow is given to the heading ram for making the head on the end of the rod.
By means of a hand screw acting upon an adjustable cross yoke or abutment the
tension of the coiled springs may be adjusted. The heading ram is moved back so
as to compress the springs by the toe of a cam on the main shaft acting on a lug
on a bar connected with the said heading ram and when this bar has been moved
back to its full extent it is held in that position by a stop bolt or
upwards and made to take into a hole in the lower side of the ram
46
"dog" shot
The said stop bolt or "dog" is forced down so as to release the ram at the
proper time by means of a lever and cam. The heading ram may be beld out of
action by means of a sliding disc on the main shaft being brought over a lug on
the lever by which the ram is released.
In order to detach the finished bolt or spike from the tools a knocker off is
employed consisting of an angular lever operated upon by a cam on the main
shaft.
The general action of the machine is as follows:—
The heated rod to be made into bolts spikes or other like articles is passed
through an eye or guide and between the teeth of the feeding tongs which seizing
the said rod carry it forward to the griping dies which at the proper time close
upon and hold the said rod firmly. The feeding tongs now open and make their
back movement. The heading ram is next released and shot forward by its
springs against that part of the rod extending beyond the griping dies so as to
form a head on the said rod. As the heading ram makes its back motion the
griping dies open thereby releasing the rod for a fresh feed and the pointing tools
advancing sever the headed bolt from the rod and at the same time fashion the
point of the bolt or article which is removed from the machine by the knocker off
described,