Improvements in Screw-keys or Spanners.
Year: 1896

page_text: Date of Application, 30th Dec., 1896
Complete Specification Left, 6th May, 1897-Accepted, 12th June, 1807
Improvements in Screw-keys or Spanners.
I GEORGE WILLIAM WALKER, of Marikuppam, Mysore State, in the Empire of
India, Engineer, do hereby declare the nature of this invention to be as follows:-
My said invention relates to improvements in spanners for turning bolts, nuts and
screws as is well understood.
According to my invention I form one side of the spanner jaw with a tail or tongue
which slides in' a groove or slot formed in the thickness of the spanner lead, a stop
being insorted to limit the outward movement of the sliding jaw-half. By sliding the
movable jaw-half towards or from the fixed half I increase or diminish the size of the
jaw so as to fit any size of nut or scrow head within the scope of the spanner. The means
for holding the sliding jaw-half in its adjusted position are as follows. I form the lower
edge of the sliding tongue or tail with teeth or notches preferably of a saw tooth
shape, the straight side of the teeth or notches looking away from the fixed
jaw-half.
I also provide a revolvable or movable lock barrel the said barrel being cut with
ridges or threads corresponding to the notches in the sliding tongue, and flattened on
two opposite sides. This threaded barrel is capable of being turned either by the
fingers or by an implement, so that the threads thereon shall engago with the notches
in the tongue and so hold the movable jaw-half. When it is wished to shift or adjust
the movable jaw-half I turn the locking barrel so as to present one of the flat sides
opposite to the notches in the sliding tongue. The tongue being thus freed from the
threads on the barrel may be shifted as desired and again locked by turning the
barrel till the ridges or threads re-engage with the notches. To hold the locking.
barrel in position when engaging with the tongue, I hinge a flat spring or latch on
the side of the spanner head and turn it over the flattened side of the barrel
when the barrel is in locking engagement with the sliding tongue of the movable.
jaw-half.
Y₁
:
COMPLETE SPECIFICATION.
Improvements in Sorew-keys or Spanners.
I GEORGE WILLIAM WALKER, of Marikuppam, Mysore State, in the Empire of
India, Engineer, 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 and accompanying drawings:-
My said invention relates to improvements in spanners for turning bolts, nuts and
screws as is well understood.
To render the invention perfectly 'clear I will now proceed to describe the same
more particularly, reference being had to the annexed sheet of drawings.
Fig. 1 is a plan view of my improved adjustable spanner with the sliding jaw
locked.
Fig. 2 is a similar view with the sliding law free.

page_text: is an edge view of Fig. 1.
Fig. 4 shows the spanner head partly in section.
Fig. 5 shows a separate eud view of the threaded and flat sided lock barrel.
According to my invention I form one side a of the spanner jaw with a tail or
tongue a¹ which slides in a groove or slot formed in the thickness of the spanner
head A, a stop b being preferably inserted across the slot to limit the outward
movement of the sliding jaw half a.
The tail a¹ is formed with a checked or "vee" groove to admit a similarly shaped
projection as for example at A' in Fig. 3 in order to stoady and support the sliding
jaw half a. By sliding the movable jaw half a towards or from the fixed half A¹
I increase or diminish the size of the jaw that is to say the space between the jaw
halves so as to fit any size of nut or screw head within the scope of the spanner.
For instance as indicated at Fig. 2 tho spanner may be adjusted to fit any size of nut
between . y. and .-. The means for holding the sliding jaw-half a in its
adjusted position are as follows. I form the lower edge of the sliding tongue or
tail a' with teeth or notches which clearly appear in the drawings, the said teeth
being preferably of a saw tooth shape, the straight side of the teeth or notches
looking away from the fixed jaw-half. I also provide a revolvable or movable lock
barrel & mounted in a gap in the head A and capable of being easily revolved on
an inserted pivot e the said barrel being cut with ridges or threads corresponding to
the notches or teeth in the sliding tongue a', the barrel being flattoned on two
opposite sides. This threaded, flattened barrel is capable of being turned oither by
the fingers of the user or by an implement, so that the threads thereon shal! engage
with the notches in the tongue a' as shown for example in Fig. 1 and so hold tho movable
jaw-balf a. When it is wished to shift or adjust tho movable jaw-half a I turn the
locking barrel c so as to present one of the flat sides opposite to the notches in the
sliding tongue a' as clearly shown in Fig. 2. The tongue al being thus freed from
the threads on the barrel c may be at once shifted to the desired extent and again
locked by turning the harrol e till the ridges or thrends.re-ongage with the notches in
the tail a'. To hold the toothed locking barrel c in position when engaging with the
tongue a', I hinge a flat spring or stop-latch d on the side of the spanner head A and
turn it over the flattened side of the barrel c when the barrel is in locking.engagement
with the sliding tongue of the movable jaw-half, as clearly shown in Fig. 1. When
the stop d is turned to one side as in Fig. 2, the barrel c can again be turned so as to
unlock the jaw-half a.
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 1
claim is.
1. The arrangement, construction and combination of parts constituting the
improved adjustable screw-key or spanner substantially as hereinbefore described and
illustrated.
2. An adjustable screw-key or spanner having a movable or sliding jaw-half, the
base or tail of which is furnished with teeth or notches capable of engaging with
similar tooth or notches in a revolvable barrel with flat sides and either with or
without a stop-latch to prevent the barrel from turning when in its interlocking
position, constructed, arranged and operating substantially as described and shown.
3. In an adjustable spanner of the indicated nature the threaded, toothed or
notclied barrel e with flat side or sides to permit of the rapid and easy adjustment of
the movable toothed jaw of the spanner to any desired size of nut or screw head
within the scope of the spanner, substantially as described and shown.
Dated this 5th day of May 1897.
Dated this 5th day of May 1897.
For the Applicant,
E. K. DUTTON & Co.,
5 John Dalton Street, Manchester, Chartered Patent Agents.