Improvements in Shifting Spanners.
Year: 1890

page_text: Date of Application, 14th Nov., 1890
Complete Specification Left, 14th Aug., 1891-Accepted, 7th Nov., 1891
PROVISIONAL SPECIFICATION.
Improvements in Shifting Spanners.
I, LEIGHTON MILLS of No. 7 Lovaine Terrace North Shields Northumber-
fand, do hereby declare the nature of this invention to be as follows: -
The improved spanner is made with a fixed and a movable jaw. The connexion
between the jaws is made by means of two or more bars screwed right and left
handed alternately. These bars may be fitted with nuts, heads or, collars having
teeth on their outer surface and engaging, by means of these teeth, with each other
so that, when one nut, head or, collar on one of the screwed bars is revolved that
on the other bar or bars revolve also. The nuts or screws engage in a suitable way
with the jaw or jaws and so the distance between them is adjusted. The handle of
the spanner may be attached to or form part of either jaw.
Dated this 13th day of November 1890.
LEIGHTON MILLS.
COMPLETE SPECIFICATION.
Improvements in Shifting Spanners.
I, LEIGHTON MILLS, of 7 Lovaine Terrace, North Shields, in the County of
Northumberland, Engineer, do hereby declare the nature of said invention and in
what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
The improved spanner is made with a fixed and a moveable jaw. The connection
between the jaws is made by means of two (or more) bars screwed right and left
handed alternately. These screwed bars may be fitted with tapped nuts or may
have on them heads or collars, the nuts, heads or collars having teeth on their outer
surface and engaging, by means of their teeth, with each other so that, when one
nut, head or collar on one screwed bar is revolved that or those on the other bar or
bars revolves (or revolve) also. The screwed bars engage in a suitable way with
the jaw or jaws and so the distance between them is adjusted. The handle of the
spanner may be attached to or form part of either jaw and may be formed by an
extension of the screwed enclosed in a suitable frame or sheath for the hand.
On the accompanying drawing I have shewn the manner in which I now propose
to carry my invention into practical application but I may adopt any of the
modified forms previously described in which the principle of the invention may be
applied.
Fig. 1 shews a side view with the nuts in section of a spanner of which A is the
shank or handle having formed solid upon it one of the jaws B in the substance of
which is a recess or cavity C. DD are holes drilled in the jaw to receive the
right and left hand screws E E which are secured in the other or shifting jaw F.
GG are the nuts secured in the cavity C and tapped to receive the threads of the
screws E E and having on their peripheries teeth formed so that they gear into
each other in the manner of pinions and when one nut is revolved it revolves the
other in the opposite direction and thus the jaw F is caused to close up to or recede
from the jaw B. In order to relieve the lateral strain upon the screws I may form
upon the jaw B an abutment H for the back of the jaw F and to give greater
support to the screws I prefer to form a step J see Fig. 2 so that the jaws may not
close entirely.
Fig. 2 shews another form of the spanner in which the pinion nuts G G are
confined in a cavity C in the shifting jaw F and the jaw B itself forms the abutment

page_text: for it the operation of the pinion puts upon the screwed bars D D being the same
as above described.
In a modified form the spanner may be constructed so that the screwed bars D D
work in tapped holes in the jaw, B. being rotated by toothed collars or heads,
gearing into each other, and turning with the screwed bars; or one screwed bar (or
more in a series) may be so fitted the other screwed bar (or more in a series) being
arranged to be operated by a tapped nut as already described and shewn.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
1st. Shifting spanners in which the moveable jaw is caused to approach to or
recede from the fixed jaw by the action of two or more bars, forming right and
left hand screws, operated by tapped nuts confined in a cavity or otherwise prevented
from travelling on the screwed bars which are thus compelled to travel through
the nuts with external teeth gearing into each other, like spur pinions, so that one
nut being turned in one direction the other nut or nuts revolve on their respective
screwed bars substantially as described and in one form illustrated.
2nd. The alternative modification, described but not illustrated, in which both
or all the right and left hand screwed bars work in tapped holes in the fixed bead,
by the operation of toothed collars or heads formed upon them and gearing into
each other, or in which one screwed working in connection with it is fitted to work
within a tapped nut as previously described in Claim 1.
D
1001
T. J. DANSON, F.I.P.A.,
2, St. Nicholas' Buildings, Newcastle-upon-Tyne, Agent for Applicant.