Improvements in Adjustable Spanners.
Year: 1894

page_text: Date of Application. 16th Oct., 1894
Complete Specification Left. 12th July, 1895-Accepted. 17th Aug., 1895
PROVISIONAL SPECIFICATION.
Improvements in Adjustable Spanners.
1, ARNOLD AUGUSTUS ALLCARD of 432 Glossop Road, City of Sheffield,
Engineer do hereby declare the nature of my invention to be as follows:-
My invention relates more particularly to the construction of the moving jaws
of adjustable spanners of what are known as the "Clyburn" type, and any varieties
of that type, the object being to strengthen the jaw, and thus render the spanner
more durable.
In the "Clyburn " spanner the movable jaw is provided with a shank at right
angles to the jaw proper, and fitted to slide in the head..
In cross section the shank is rectangular the upper half being narrower than the
lower half thus forming a square shoulder, which prevents the slide or shank being
forced out of the open side of the slot in which it works.
According to one arrangement of my invention I propose to retain the shoulder
before mentioned but to gradually increase the width of the upper half until at the
top it reaches the full width of the lower half; or I may make a shoulder on both
sides of the jaw shank and incline both sides upwards to the full width.
Or in some cases I may dispense with the shoulder altogether, and groove
longitudinally either one or both sides of the slide or shank to a V shape, the slot
in the head being of a corresponding shape.
Dated the 10th day of October 1894.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.
Improvements in Adjustable Spanners.
I ARNOLD AUGUSTUS ALLCARD of 432 Glossop Road, City of Sheffield
Engineer do hereby declare the nature of this invention and in what manner the
same has to be performed, to be particularly described and ascertained in and
by the following statement :-
My invention relates more particularly to the construction of the moving jaws of
adjustable spanners of the pattern known as "The Clyburn," and of any varieties
of that type of spanner.
The object of my invention is to strengthen the movable jaw which is usually the
weakest part of such spanners, and thus render them more durable.
My invention is illustrated in the annexed sheet of drawings
Fig. 1, represents a side view and edge view of the head of a Clyburn fitted with
my improved jaw.
Fig. 2, side and end views of the movable jaw.
Fig. 3, end view of movable jaw with double groove for a
Clyburn.
66
Heaps" pattern
In the ordinary "Clyburn" spanner, the movable jaw has a sliding piece
projecting on one side, at a right angle to the face of the jaw proper.

page_text: This sliding piece fits into a corresponding opening made through the head of
the spanner.
The cross section of the slide is rectangular, the upper half being of less width
than the lower half and thus forming a square shoulder on one side, which bears
against a similar shoulder formed in the head, and is for the purpose of preventing
the jaw being forced out of position when in use.
My invention which is to increase the strength of the junction between the slide
and the jaw, is carried out as follows:
Fig. 1, represents a spanner, the movable jaw A, being made with a slide A³, to
fit into a groove or opening of corresponding form in the head B.
Instead of making the slide of the rectangular configuration as indicated by the
dotted lines, I make one side above the shoulder C, inclined so as to gradually
increase the width of the part until it reaches the junction D, with the jaw
proper A, thus adding considerably to the strength of this weak part of Clyburn
spanners as hitherto made.
[ may if preferred make a shoulder upon both sides of the slide, and incline both
sides as shown in Fig. 3.
In either case I make the width of the slide at the junction equal to that of the
lower part A, or thereabouts.
The underside of the slide where marked E, is serrated or cut with a portion of
a screw thread into which the screw threads of the roller F, engage as is usual.
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
clain is:
1. Constructing the movable jaws of what are known as "Clyburn" spanners,
and of other varieties of the Clyburn type, in the manner hereinbefore described
and as shown in Fig. 2, of the drawings.
2. Constructing the movable jaws of the " Clyburn" type of spanners in the
manner as herein before described with reference to the Fig. 3, of the annexed
drawings.
Dated the 11th day of Ini 1805
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.