Year: 1889

page_text: Date of Application, 6th Feb., 1889
Specification Accepted, 9th Mar., 1389
1, THOMAS ARCHER Junior, of No. 6 Park Terrace, Gateshead-on-Tyne 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 :-
I construct the spanner of two pieces of iron, steel or other suitable material,
hinged at one end, so as to be capable of opening and closing at the other end.―
The end which opens and closos is that which embraces the nut or bolt-head, when
the spanner is in use. In order to afford a firm support to the sides of the
spanner when in use, I fasten to one of the sides a bridle link, which embraces
the other side, but, which is capable of movement, on the pin or rivet by which
it is fastened, as before described.-For distinction in my description I will call
the side to which the bridle link is attached the side X, and I will call the other
side the side Z. I will also call the joint by which the side X is attached to the
side Z. the joint J. The outer edge of the side Z, round which the bridle link
moves, I shape so, that according to the position of the link, the sides X and Z
are held more closely together or allowed to separate more from each other, while,
at the same time, the side Z, is firmly supported by bearing against the end of
the link. It will be seen that, by this arrangement (the link being a working fit
on the side Z.) the two sides of the spanner are prevented from moving sideways,
as they might do if wholly dependent on the joint J; and they are prevented from
opening from each other, more than to that degree permitted by the position of
the link. I am thus enabled to construct an adjustable spanner, which, when set
to any desired size, has a rigidity against extension corresponding to the strength
of the link, and which may, with great facility, be altered from one size to
another.
My Invention is capable of modification in various ways, as, for instance, I might
fit the end of the link with a set screw or wedge so as to dispense with the actin
movement of the link itself, or, so as to give more accuracy of adjustment; or 1
might make the link like the link of a chain, so as to slide on both the sides X
and Z. instead of its being fixed to the side ✗ as described.-I might also put a

page_text: series of teeth on one or both the sides X and Z. so as more effectually to fix
the position of the link, and I might place a spring hetween the sidos X. und Z.
tending to press them apart or, instead of a bridle, or two sided link, I might
form a single link, hinged within the side X, and passing through the thickness
of the side Z, so as to he somewhat like what is called a wing compass or wing
calliper, and having an enlarged end on which the side Z would bear, but as these
are more modifications of detail, and not essential features of my invention I do
not think it needful to extend the list.
The drawing hereto attached represents the simple form of spanner first described,
X and Z. are the sides, moving to and from each other, so far as the bridle link
permits on the joint; the link moves upon the bolt or rivet R. the path of the
part on which the side Z. bears, being indicated by the dotted line; the jaws of
the spanner are marked S.
Having now particularly described and ascertained the nature of any said Inven
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
The construction of an adjustablo screw key or spanner with a link embracing the
sides of the spanner substantially as and for the purpose described.
CHIM KITCH
COOT WIT 10 Con
JAMESON & SCHAEFFER,
Agents for Applicant.