Improvements in Pipe Wrenches.
Year: 1891

page_text: Date of Application, 16th Feb., 1891-Accepted, 18th Apr., 1891
COMPLETE SPECIFICATION.
Improvements in Pipe Wrenches.
I, THOMAS NEWMAN, of the City of Poplar Bluff, Butler County, State of
Missouri, United States of America, Machinist, 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:—
My invention relates to improvements in pipe wrenches, and consists in the
novel
arrangement and combination of parts as will be more fully hereinafter
described and designated in the claims.
In the drawings
:-
Fig. 1, is a side elevation of my invention showing the same applied to an
ordinary pipe.
Fig. 2, is a top plan view of my invention.
Fig. 3, is a top plan view of a bifurcated hooked jaw, which I employ in carrying
my invention.
out
Referring to the drawings
-
1, indicates an arm or handle by which my invention is manipulated and also
functionally operated.
To the front end of said arm the bifurcated hooked jaw 2 is pivotally secured by
means of a nut bolt 3.
The angular portion of said jaw is provided with a series of ratchet teeth
adapted to impinge and bite whatever object over which said jaw is placed.
Said jaw is bifurcated as above stated, and interposed between the prongs or
bifurcations thereof is a small lever 4, the end of which is curved and also provided
with upwardly formed ratchet teeth.
Said lever 4 is pivotally secured between the prongs or bifurcations of jaw 2 by
means of a nut bolt 5.
Pivotally secured by means of nut bolt 6 to arm 1 and lever 4, are side plates 7,
between which said arm and said lever are interposed.
Said plates 7 are so secured to said arm 1 and lever 4 that they generally occupy
a parallel position to the main portion of hook 2. This parallel arrangement in
combination with arm 1 and lever 4, operates practically in the manner of the
parallelogram of forces, the principles of which are well understood and need no
elucidation.
Having given a fully explicit description of my invention, I will now proceed to
describe its application and its use.
The portions are made and constructed substantially as hereinbefore described.
When it is desired to turn the pipe or any other object, the operator should
lower or depress jaw 2, by which operation lever 4 is elevated thereby affording
sufficient space between said jaw and said lever for the reception of the desired pipe.
When arm 1 is elevated the power applied to said arm is transmitted to plates 7
and from thence to lever 4 and is ultimately transmitted in the form of pressure.
against the pipe or to whatever object the wrench is applied.
The greater the power applied to said arm 1, the greater will be the impinging
contact between lever 4 and the resistance of the pipe or whatever object is being
turned.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A pipe wrench, consisting of an arm, a jaw and a lever for impinging the
resistance. pivotally secured between the same, substantially as set forth.

page_text: 2. A pipe wrench, consisting of an arm, a bifurcated jaw and a lever pivotally
secured to said jaw and arm for impinging the resistance, substantially as set
forth.
3. A pipe wrench, consisting of an arm 1, a bifurcated jaw 2 pivotally secured
to said arm, a lever 4 pivotally secured to said jaw, and plates 7 pivotally secured
to said arm and lever for transmitting the power applied to the arm, to the
resistance to be overcome, substantially as set forth.
Dated this 16th day of February 1891.
HERBERT J. ALLISON,
Agent for the Applicant.