An Improved Gripping Tool for Extracting or Inserting Screw-studs, applicable also to other and analogous purposes.
Year: 1894

page_text: Date of Application, 23rd July, 1894-Accepted, 25th Aug., 1894
COMPLETE SPECIFICATION.
An Improved Gripping Tool for Extracting or Inserting Screw-studs,
applicable also to other and analogous purposes.
I, WILLIAM EARL of 13 St. Luke's Terrace, Green Bank, Darlington in the
County of Durham, Boiler Maker, 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 an improved gripping tool for extracting or inserting
screw-studs applicable also to other and analogous purposes.
Hitherto it has been the custom to form square heads on screw-studs to enable a
spanner to be applied to them.
By my invention I can operate on studs having circular heads to insert or remove
them with as much ease as if they had square-heads.
I therefore save the labour of forming square heads to the studs and in like
manner my improved tool is applicable for gripping tubes pipes and the like for
attaching or detaching them from each other when required.
I will describe my invention with reference to the accompanying drawings in
which Figures 1 and 2 show in plan an upper and an under view of the tool and its
mode of application Figure 3 being a side view of the same partly in section and in
the following description like marks of reference designate like parts.
Referring to the drawings it will be observed that the tool consists of a handle H
with an enlarged end in which is formed a hole A. Out of the enlarged end and
extending about halfway or thereabouts over the hole and for a distance beyond
the edge of the hole and for a certain depth I remove the metal to form a recess as
shown in the drawings and into a part of this recess a tapered serrated key K is
intended to fit. The back of the key may be rounded off to fit into the corre-
sponding recess formed for it as shown."
The hole in the tool may be a little larger than the size of the stud or equivalent
object. Thus for an one-inch stud the hole may be one inch and one eighth which
sized hole will also serve to operate on studs somewhat less than one inch in
diameter.
In applying the tool, put it for example over the stud-head S and insert the key
till it wedges itself between the stud and the rounded surface formed in the recess
on the tool. By pulling round the handle H in the right direction the effect is to
cause the key to grip harder and harder when the stud can be easily started and
removed.
A circular stud-head projecting from the metal or of an inch can be readily
gripped and removed as above described.
The key may conveniently be attached to the tool by a short chain C which also
enables the key to be inserted and used as described from either side of the tool.
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. The improved tool consisting of the combination with the handle H having
an enlarged head thereon in which is formed a hole and a recess of the tapered
and serrated key K the parts being arranged and adapted for use substantially as
and for the purposes herein set forth.

page_text: 2. The combination of parts comprising the improved tool arranged and adapted
for use substantially as and for the purposes herein set forth.
Dated this 20th day of July 1894.
A. CRAWHALL CHAPMAN,
3, St. Nicholas Buildings, Newcastle-on-Tyne, Patent Agent.