IMPROVEMENTS IN SPANNERS
Year: 1883

page_text: LETTERS PATENT to Joseph Robson of Sheffield in the County of York,
Engineers Tool Manufacturer, and John William Tingle of the same place,
Mechanic for an Invention of "IMPROVEMENTS IN SPANNERS”
PROVISIONAL SPECIFICATION left by the said Joseph Robson and John
William Tingle at the Office of the Commissioners of Patents on the
15th March 1883.
JOSEPH ROBSON, of Sheffield, in the County of York, Engineers, Tool manu-
facturer, and JOHN WILLIAM TINGLE, of the same place, Mechanic, "IMPROVEMENTS
IN SPANNERS,"
Our invention refers to that class of spanners having an adjustable jaw and
which are known in the Trade as "Clyburn spanners," and our invention consists
in an improved combination and construction, or in improved combinations and
constructions of the parts, which adds greatly to the strength and durability of the
tool, and diminishes its liability to injury.
We form the movable or adjustable jaw as in the "Clyburn" spanner but with
a projection extending under the "cross bar," or slide, and the end of this
projection is arranged and fitted to rest and slide against the end of a slot in the
solid part of the spanner and thus gives more leverage and strength to resist the
strain when in use; and instead of actuating and holding the movable jaw by a
milled screw roller the threads of which gear with teeth forming a rack on the
under side of the cross bar or slide, as in the "Clyburn spanner," we form a hole in
the said projection from the movable jaw and screw tap it, for a screw placed
parallel to the cross bar, and having bearings in the solid part of the spanner the
screw being rotated to adjust the jaw by a milled pulley or boss secured on the
screw, and rotating in a slot formed in the solid part of the spanner, which slot
prevents the screw from moving endways, and thus instead of the strain coming

page_text: only upon the teeth of a rack and a segment of the screw threads, as in the
"Clyburn" it is resisted by the entire circle of the screw threads.
By a modification of our invention the pulley or boss for actuating the screw,
has a screw thread, formed upon its periphery, to gear with teeth formed on the
under side of the " cross bar
or slide, and thus both an entire screw and screw
"
and rack are combined to act together in the same spanner.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Joseph Robson and John William Tingle in the Great Seal Patent
Office on the 22nd June 1883.
JOSEPH ROBSON of Sheffield in the County of York, Engineer's Tool Manu-
"IMPROVE-
facturer, and JOHN WILLIAM TINGLE of the same place Mechanic
MENTS IN SPANNERS,"
Our invention refers to that class of spanners having an adjustable jaw and
which are known in the Trade as "Clyburn Spanners," and our invention consists
in an improved combination and construction of the parts, which adds greatly to
the strength and durability of the tool and diminishes its liability to injury.
We form the movable or adjustable jaw as in the “Clyburn spanner" but with a
projection extending under the cross bar, or slide, and the end of this projection is
arranged and fitted to rest and slide against the end of a slot in the solid part of
the spanner and thus gives more leverage and strength to resist the strain when in
use; and instead of actuating and holding the movable jaw by a milled screw roller
the threads of which gear with teeth forming a rack on the under side of the cross
bar or slide as in the Clyburn spanner, we form a hole in the said projection from
the movable jaw and screw tap it for a screw placed parallel to the cross bar, and
having bearings in the solid part of the spanner the screw being rotated to adjust
the jaw by a milled pulley or boss secured on the screw, and rotating in a slot
formed in the solid part of the spanner which slot prevents the screw from moving
endways and thus instead of the strain coming only upon the teeth of a rack and a
segment of the screw threads, as in the " Clyburn" it is resisted by the entire
circle of the screw threads.
Fig 1 is an edge view, fig 2 a side view fig 3 a side view with parts of the solid
jaw supposed cut away to show the movable jaw and screw, fig 4 a side view of
the movable jaw detached, fig 5 an edge view at the opposite side to that shown
by fig 1 and fig 6 a view similar to fig 5. but showing a modification in the parts.
a the movable jaw with the screw tapped projection a² under the cross bar a'.
b is the screw which screws and rotates in the screw tapped hole in the
projection a2 at one end and has a bearing in a hole in the solid part c of the
spanner at the other end-This screw is screwed tightly into the milled pulley b₁

page_text: by which the screw is rotated, the milled pulley fitting accurately into the slot
formed for it in the solid part of the spanner to prevent end movement in the
screw.
The ledge on the cross bar or slide of the movable jaw which helps to guide and
hold it or may be formed in some cases as shown in fig 6 and by peculiar dotted
lines in fig 5.
The improved spanner is made so that the strain when in use comes upon the
solid part of the spanner at c¹ or both upon that part and the ordinary parts as in
the ordinary Clyburn spanner.
We have now particularly described the nature of our said invention and the
mode of carrying it into effect and claim as our invention.
The combination construction and arrangement of spanners with a rotating
screw the end of which screws through a tapped projection from the cross bar
substantially as hereinbefore described and illustrated by the drawings.
In Witness whereof we the said Joseph Robson and John William Tingle
have hereunto set our hands and seals this Twentieth day of June in the
year of our Lord one thousand eight hundred and eighty three.