Improvements in Pipe Wrenches.
Year: 1891

page_text: Date of Application. 23rd June, 1891-Accepted, 25th July, 1897
Date of Application. 23rd June, 1891-Accepted, 25th July, 1891
COMPLETE SPECIFICATION.
[Communicated from abroad by CATHARINE FRANCES DONAHUE, of Yonkers,
in the County of Westchester and State of New York, United States of
America, Widow.]
Improvements in Pipe Wrenches.
I, OLIVER IMRAY of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Fellow of the Institute of Patent Agents, 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
This invention relates to pipe wrenches of that kind in which a sliding jaw is
moved by a screw nut so as to clamp between it and a stationary jaw pipes of
various diameters.
The object of the invention is to provide that the jaws shall grip the pipe as
the wrench is moved in the one direction and shall release the pipe as it is moved
in the reverse direction as will be explained referring to the accompanying
drawing.
Fig. 1 is a side elevation partly in section of a pipe wrench according to this
invention.
Fig. 2 is a front view of the same.
Fig. 3 is a perspective of the adjustable jaw and its shank.
Fig. 4 is a similar view of the handle-stock.
1 is the handle-stock having at one end a stationary serrated jaw 2 and a laterally
projecting housing or guide frame consisting of a rectangular eye 3 and a pair of
flanges 4, between which is adapted to move lengthwise a screw shank 5, carrying
at its outer end a serrated jaw 6. The faces of the jaws are preferably pieces of
grooves and
steel made with diagonally arranged teeth and with tongues to enter
to be secured therein by transverse pins, but the faces may be made in one with
the shanks or may be in separate pieces otherwise fixed to the shanks.
Within the eye 3 on each side is a projection 7 with rounded back and
front sides 8. These projections enter longitudinal grooves 9 formed in opposite
sides of the screw shank 5, which passes through the screw nut 10 placed between
3 and 4, in such manner that the screw shank can oscillate on the projections 7 as
a pivot or bearing and can also be moved lengthwise by rotating the nut 10. The
grooved sides of the shank 5 may be flattened as shewn the screw thread being of
the mutilated kind; the nut is preferably circular milled on its outside surface.
The projections 7 have their inner and outer edges curved in arcs of considerable
radius.
A spring acts on the tail end of the screw shank 5 pressing it outwards for the
purpose of normally holding the toothed face of the moveable jaw parallel with
that of the stationary jaw.
If the wrench be in the position shewn in Figure 1, and engaged with a pipe,
the downward movement of the handle stock in the direction of the arrow 12 tends
to swing the screw shank on the pivot or bearing 7 and move the jaw 6 in the
direction of the arrow 13, thus gripping and turning the pipe; but the reverse
movement of the handle stock in the direction of the arrow 14 causes the screw
shank to swing on the pivot or bearing 7 moving the jaw 6 in the direction of the
arrow 15 so as to release the grip and place the parts in position for a fresh
purchase or grip on the pipe. The swinging movement of the screw shank 5
can be effected by the workman pressing with his finger on the tail end of the
5 shank.
The sides of the eye 3 may be disconnected at their outer ends but the construction
shown is preferred.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In a pipe wrench, the combination of the sliding and oscillating longitudinally
grooved screw shank and its jaw, with the stationary jaw-stock formed with an
-eye having rounded internal projections on which the oscillating jaw can rock,
and an adjusting nut for operating the moveable jaw, substantially as shown and
described.
Dated this 23rd day of June 1801
ABEL & IMRAY,.
Agents for the Applicant.