CERTAIN NEW AND USEFUL IMPROVEMENTS ON PIPE TONGS
Year: 1873

page_text: LETTERS PATENT to Hazen Prescott Huntoon, of the State of Massa-
chusetts, of the United States of America, for the Invention of
"CERTAIN NEW AND USEFUL IMPROVEMENTS ON PIPE TONGS."-A communi-
cation from James Richardson Brown, residing in the County of
Middlesex, of the State of Massachusetts, of the United States of
America.
COMPLETE SPECIFICATION filed by the said Hazen Prescott Huntoon
at the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 19th November 1873, pursuant to the
9th Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HAZEN
PRESCOTT HUNTOON, of the State of Massachusetts, of the United States
of America, send greeting.
WHEREAS I am in possession of an Invention of "CERTAIN NEW
and Userul ImpROVEMENTS ON PIPE TONGS," and have petitioned Her most

page_text: Excellent Majesty Queen Victoria to grant unto me, my executors,
administrators, and assigns, Her Royal Letters Patent for the same,
and have made solemn Declaration that it is a communication to me
from one James Richardson Brown, a person resident in the County of
Middlesex, of the State of Massachusetts, of the United States of
America.
NOW KNOW YE, that I, the said Hazen Prescott Huntoon, do hereby
declare the nature of the said Invention, to be as follows, reference
being had to the accompanying Drawings making part of my Specifi-
cation :-
The nature of my Invention in pipe tongs having jawed levers crossing
one another is as follows, that is to say :—
The first part of it relates to the hook jaw lever adjusting screw
pivoted within and connected with such lever, and screwed into and
through the fulcrum pin arranged within, and applied to the slot of such
lever and to revolve within the tooth jaw lever.
The second part of such Invention relates to a yoke combined with
the toothed and hooked jaw levers, their fulcrum pin, and the adjusting
screw or screws thereof, the purposes of the yoke being not only to
support the pin and relieve it from contact with and direct strain of the
screw or screws, but to save weakening the pin by forming through it a
hole to receive the journal on the end of the screw.
The third part of such Invention relates to the combination of an arm
hinged to the tooth jaw lever with adjusting screws, so connected
with or applied to the said arm and the hook jaw lever as to be capable
by revolving one of them of moving the arm and the tooth jaw lever
either towards or away from the hook jaw in order for the adjustment
of the jaws either nearer to or farther from each other as occasion may
require.
Of said Drawings, Figure 1 is a side elevation, Figures 2 and 3
are longitudinal sections of pipe tongs containing the first part of my
Invention.
Figure 4 is a side view of their adjusting screw; Figure 5 denotes a
il loration. Timuro
tan view. Thou
"
longitudinal contion

page_text: Figure 9 is a longitudinal section showing a compound screw for
operating the hook jaw lover. Figure 10 is a side view, and Figures 11
and 12 are longitudinal sections of a pipe tongs, embracing the third
part of my Invention.
In the said Figures A denotes the hook jaw lever, and B the toothed
jaw lever, the first being provided with a hook jaw, and the last with a
simple tooth jaw, all as represented.
In the pipe tongs shown in Figures 1, 2, and 3, the adjusting screw
has no endwise motion, but only a rotary motion in the hook jaw lever
or with reference to it, and thus the head of the screw always maintains
one position close up to the lever, whereby the screw is little liable to be
in the way while the tongs are being used.
screw,
In Figures 1, 2, 3, and 4, C denotes the fulcrum pin, D the adjusting
and E a nut screwed upon the fulcrum pin. The hook jaw lever
has a long slot e in it to receive the screw, and the fulcrum pin arranged
in it as shown. The said adjusting screw screws into and through the
fulcrum pin C, and is provided with a cylindrical pivot or neck a next
to its head b. This neck has a groove c (see Figure 4, which is a
separate view of the screw) made in and around it, and the neck fits
within a corresponding cylindrical bearing d made in the hooked jaw
lever, and opening out of the slot e thereof, all being as shown. Further-
more, two pins f,f, are inserted in or through the hook jaw lever and
the groove c, the whole being to so pivot the adjusting screw in the said
lever that said screw may be revolved on its axis therein, but be
incapable of any endwise movement independently of the lever. On
revolving the screw the fulcrum pin will be moved in the slot, and will
move the toothed jaw lever relatively to the hooked jaw lever.
The pipe tongs shown in Figures 5, 6, 7, 8, and 9, may be thus
described. In such Figures A is the hook jaw lever, while B is the
toothed jaw lever, they being crossed on one another and connected by a
fulcrum pin C which goes through them, the yoke E, and a slot a formed
through the hooked jaw lever. The yoke spans the latter lever in
manner as shown, which, on opposite sides is notched to receive the yoke
and guide it in its longitudinal movements.
The operative screw D (shown in Figure 6, 7, and 8), of the fulcrum
pin disposed in the longer axis of the slot a screws at the end of the slot,

page_text: in order for the adjustment of the jaws nearer to or further from each
other, as occasion may require.
In witness whereof I, the said Hazen Prescott Huntoon, have
hereunto set my hand and seal this Fifth day of November,
A.D. 1873.
HAZEN PRESCOTT HUNTOON.
(L.S.)