Improvements in Pipe Wrenches.
Year: 1893

page_text: Date of Application, 7th Oct., 1893
Complete Specification Left, 7th July, 1894-Accepted, 6th Oct., 1894
FRUVIDIONAL SPECIFICATION.
Improvements in Pipe Wrenches.
THOMAS MARTIN Mechanical Engineer 6 Lower Lawn Road Hampstead
London N.W. do hereby declare the nature of this invention to be as follows:-
My invention relates to an improved pipe wrench or similar tool for gripping or
turning gas and water pipes, couplings, screw rods, nuts or any round or cylindrical
work as may be desired to be operated upon as shown on the accompanying
drawings.
Fig. 1 shows side view of wrench with vee jaw and swinging hook in position
acting on small size pipe.
Fig. 2 a front view of the same.
Fig. 3 side view of wrench with vee jaw and swinging hook in position to take
larger size pipe.
Fig. 4 back view of same.
The holes in lever or handle A are placed in such a manner that by passing the
screw pin D forming the pivot through the swinging hook B into the holes ccccc
of handle or lever, five different sizes of work may be operated upon by this
instrument, but other sizes may be made to take in any desired range of diameters
as may be required. The vee jaw F is worked on a pine and pivoted so that the
centre on which the vee jaw works is eccentric to the surface operated upon and in
direct thrust to the swinging hook B thus forcing the vee jaw F and the swinging
hook B in opposite directions and rendering it a positive grip, the important feature
being that by having four bearing points ffff when gripping the work it prevents
any tube from being split defaced or flattened.
Dated this 7th day of October 1893.
THOMAS MARTIN.
COMPLETE SPECIFICATION.
Improvements in Pipe Wrenches.
THOMAS MARTIN Mechanical Engineer 6 Lower Lawn Road Hampstead
London N.W. 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 an improved pipe wrench or similar tool for gripping or
turning gas and water pipes, couplings, screw rods, nuts or any round or cylindrical
work as may be desired to be operated upon as shown on the drawings accom-
panying Provisional Specification.
Fig. 1 shows side view of wrench with V jaw and swinging hook in position
acting upon a small size pipe. Fig. 2 a front view of the same.
Fig. 3 side view of wrench with V jaw and swinging hook in position to take a
larger size pipe. Fig. 4 back view of same.
The holes in lever or handle A are placed in such a manner that by passing the
screw pin D forming the pivot through the swinging hook B into the holes ccccc
of handle or lever, five different sizes of work may be operated upon by this
instrument, but other sizes may be made to take in any desired ranges of diameters
as may be required.

page_text: The jaw marked F is attached to the handle or lever A by means of a pin or
stud arranged in such a manner that it forms a cam motion by means of being in
direct thrust to the swinging hook B thus tightening up to the work as the lever
or handle A is pulled or thrust as the case may be, the important feature being
that by having four bearing points ffff when gripping the work it prevents any
tube from being split flattened or defaced.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :
1. A swinging hook adjustable by a screw pin passed through a series of boles
arranged as described in handle or lever.
2. The jaw F forming a cam by being placed out of line of the centre of tube
or other material operated upon insuring a positive grip bearing on four points ffff
and thus preventing any tube from becoming split.
Dated this 7th day of July 1894.
THOMAS MARTIN.