An Improved Shifting Spanner.
Year: 1892

page_text: Date of Application, 17th Nov., 1892
Complete Specification Left, 16th Aug., 1893-Accepted, 7th Oct., 1893
PROVISIONAL SPECIFICATION.
An Improved Shifting Spanner.
I LEIGHTON MILLS of 4 Mutley Park Terrace Plymouth Devonshire, Engineer,
do hereby declare the nature of this invention to be as follows:-
The back part of the moveable jaw of the spanner is enlarged towards the
stationary jaw and the stationary jaw is enlarged towards the moveable jaw. A
groove is formed in the enlarged part of the one and the other is reduced in
thickness forming a tongue sliding in the groove, together forming a clasp with a
double abutment. Between this part and the points of the jaws is a bolt passing
into both jaws; this bolt may be a fixture in one jaw fitted with screwed nut
working in a cavity in the other jaw or, the bolt may be screwed into both jaws
with right and left handed threads; by revolving the right and left handed screw,
or the nut, the jaws are adjusted to the required distance apart. Instead of forming
the jaws with a groove and tongue as aforesaid the back parts of the jaws may each
be reduced in thickness so as to half lap each other.
Dated this 16th day of November 1892.
COMPLETE SPECIFICATION.
An Improved Shifting Spanner.
LEIGHTON MILLS 4 Mutley Park Terrace Plymouth Devonshire, 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 :―
•
In the accompanying drawings, Figures 1 and 3 are side elevations and Figures 2
and 4 shew in plan two methods of making my improved shifting spanner.
The same reference letters and figures are used in each corresponding figure.
In Figure 1A is the moveable jaw, B is the fixed jaw formed solid with the
shank or handle B, A is the enlarged or prolonged part of the moveable jaw
having a groove formed through it, B₁ is the enlarged part of the fixed jaw and is
at that part reduced in thickness forming a tongue sliding in the aforesaid groove.
In plan Fig. 2 is shewn the groove slotted through the moveable jaw with the
tongue B¹ sliding in it. The jaws thus arranged form practically a pair of bent
levers with an abutment respectively at E and F. In Figures 1 and 3 the adjusting
bolt is shewn at G situated laterally between the sliding parts of the jaws and the
work to be acted on. In Figure 1 this bolt has right and left handed screws at
alternate ends and has a milled disc head for turning it with the fingers. The left
handed thread in this case is of finer pitch than the right handed one so that it may
not unscrew so much relatively from the jaw, thus keeping the milled head within
the protection of the stop H on the fixed jaw. The bolt in Figure 3 is also screwed
right and left handed at alternate ends and has a milled head, affixed to one end,
working in a cavity formed in either of the jaws, as at C. The bolt however may
be a fixture in either of the jaws and be fitted with a nut working in a cavity in
either of the jaws. Other convenient methods of fitting the adjusting bolt may be
adopted which, in all cases, is intended to act as a fulcrum to the jaws between the
abutments E or F and the work to be acted on. The pin K through the shank,
Figures 1 and 3, is for preventing the moveable jaw drooping forward. Instead of
the jaws being clasped, or engaged, with a tongue and groove as in plan Figure 2,
the fixed and moveable jaws may each be reduced in thickness at the enlarged

page_text: parts A and B respectively on alternate sides as shewn in plan Figure 4, forming
a half lap with the abutments on alternate edges. The relative positions of the
jaws as shewn in Figures 1 and 3 may be reversed, the moveable jaw being made to
slide towards the shank instead of away from it as shewn. Also in either method
the groove or slot, or the tongue, may be formed on either of the jaws.
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
claim is :-
:-
1. A shifting spanner having the jaws arranged as a pair of bent levers in
combination with the adjusting bolt acting as a fulcrum to the said levers between
the abutments of the said levers and the work to be acted on substantially as
herein set forth and described, and shewn in the accompanying drawings.
2. A shifting spanner as described in Claim 1 in which the adjusting bolt is
screwed into the jaws with right and left handed screws of differential pitches for
the purpose substantially as herein set forth and shewn in the accompanying
drawings.
Dated this 15th day of A noust 1893
LEIGHTON MILLS.