IMPROVEMENTS IN MACHINERY OR APPARATUS FOR HEATING AND DELIVERING METAL BARS
Year: 1870

page_text: PROVISIONAL SPECIFICATION left by Albert Angell at the Office of
the Commissioners of Patents, with his Petition, on the 26th March
1870. A communication from abroad by Samuel A. Darrach, of
Newburgh, Orange County, in the State of New York, in the
United States of America.
I, ALBERT ANGELL, of Rio de Janeiro, in the Empire of Brazil, but at
present of 35, Southampton Buildings, in the County of Middlesex, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
MACHINERY OR APPARATUS FOR HEATING AND DELIVERING METAL BARS," a
communication to me from abroad by Samuel A. Darrach, of Newburgh,
Orange County, in the State of New York, in the United States of
America, to be as follows:-
This Invention consists in the arrangement of a revolving furnace
provided with bell-mouthed holes in its sides through which the bars are
introduced, and covered with a bonnet in combination with a suitable
mechanism for introducing and removing the bars in such a manner
that while the furnace revolves the bars are heated to a uniform

page_text: temperature and a tender is obtained capable of heating and delivering
metal bars automatically with great rapidity and regularity.
Further in the arrangement of a windlass passing through the interior
of the bonnet and connecting by chains with a ring which catches under
a flange cast solid with the top of the revolving portion of the furnace
in such a manner that said revolving portion can be readily lifted up
into the bonnet and free access to the fire obtained.
Also in the arrangement of a double ratchet on the exterior of the
revolving furnace in combination with a moving and a stop pawl con-
nected together by a pin and cam slot in such a manner that the stop
pawl is automatically raised and depressed by the action of the moving
pawl and the motion is always arrested at the
proper
moment.
Further in the arrangement of an additional perforated ring which slides
up and down on inclined planes attached to the outside of the revolving
furnace in combination with the holes in the sides of said furnace in
such a manner that when said additional ring is raised the holes in it
form a support for long metal bars, and if the additional ring is lowered
the tongs or spring jaws which serve to withdraw the heated bars from
the furnace can be brought close up to its side and the furnace is in
condition for heating short bars.
Also in the arrangement of a cone under the feed pipe through which
fuel is introduced into the furnace and covering the pivot on which
the fire pot revolves in such a manner that on dropping down on said
cone the fuel is evenly and uniformly spread over the grate surface,
whilst the pivot is protected against dust and dirt and against the direct
action of the fire.
Further in the arrangement of sectional grates supported by eccentric
pivots between rings which can be turned round from the outside of the
furnace and resting upon stationary ribs in such a manner that by
imparting to said ribs a short reciprocating movement, the fire is readily
cleaned, and by moving the rings far enough in one and the same
direction the grates are simultaneously set free and the fire is damped.
Also in the arrangement of cams and cam grooves in combination
with the feed box containing the blanks in such a manner that au
automatic shaking motion is imparted to said feed box and the blanks
are caused to drop without fail into the feed channel.
fire pot is perforated to provide for the escape of
The top of the
the products of

page_text: combustion, and said fire pot is supplied with fucl through a funnel
which is cast solid with or otherwise rigidly attached to the perforated
top. The bars or blanks to be heated are placed in a box to which a
transverse shaking motion is imparted by means of a cam groove which
acts on a bell-crank lever and by this motion the feed box is carried over
the feed channel in the platform which supports the box. In said
feed channel is fitted a pusher to which a reciprocating motion is
imparted by a cam, and the rotary motion of the fire pot is so timed
that one of the holes in its sides comes opposite the feed channel
whenever the pusher begins to move forward and the bar which has
been deposited in the feed channel is pushed into the hole of the fire
pot. As the motion of the apparatus progresses one hole after the other
receives its bar, and each bar is carried round with the fire pot until it
arrives opposite the discharge mechanism; during this time the bar is
heated.
The discharge mechanism consists of two spring jaws, which are
pivotted to a slide to which a reciprocating motion is imparted by a cam.
This cam acts on a pivot which projects from a secondary slide situated
on the top of the main slide and the inner end of which forms a wedge.
In moving away from the fire pot the two slides are connected together
by a spring latch, which is secured to the main slide and which catches
over a pin projecting from the secondary slide, and in moving up to the
fire pot the two slides are connected together by a second spring latch
which is attached to the main slide and catches over a second pin
projecting from the secondary slide. When the main slide has reached
the rear end of its stroke the spring latch on the main slide strikes a
stop and the secondary slide is disengaged, so that it can move back far
enough to withdraw the wedge from between the shanks of the jaws, and
said jaws are thrown open by the action of their springs. At the same
time the second pin is thrown under the second latch, and both slides
begin their inward stroke in conjunction, but when the jaws have come
close up to the periphery of the fire pot the second latch strikes against
a stop whereby it is raised so as to disengage the secondary slide from the
main slide, and as the motion of the cam proceeds, the secondary slide
continues its motion and the wedges forced between the shanks of the
jaws causing them to close upon the bar which projects from the fire
pot and which at that moment has arrived in the proper position to be
grasped by said jaws. After the jaws have been closed upon the bar the

page_text: two slides recede having been locked together by the first mentioned
latch and the heated bar is withdrawn from the furnace. When the main
slide has reached the rear end of its stroke the secondary slide recedes
still further, as previously described, the wedge is withdrawn from between
the shanks of the jaws, the jaws open, and the bar drops down on to
a conductor leading to a bolt heading or rivet machine, or to any
other mechanism by which said heated bars are to be further operated
upon.