Moveable Screw Spanner or Wrench.
Year: 1892

page_text: Date of Application, 18th Nov., 1892
Complete Specification Left, 8th July, 1893-Accepted. 12th Aug.. 1893
PROVISIONAL SPECIFICATION.
Moveable Screw Spanner or Wrench.
JOHN HERBERT WYNN Tool Manufacturer of Commercial Street Birmingham
in the County of Warwick, do hereby declare the nature of this invention to be
as follows:-
An arrangement of the parts of screw spanners hereinafter described, whereby
the moveable jaw, which slides on the bar of a spanner, is adjusted thereon by a
screw, worked from the top of the spanner or wrench head; the rotation of the
screw causes the moveable jaw to travel up & down the bar.
Spanners or wrenches constructed according to my improvement are quite
uniform on both sides; the screws well protected & not at all likely to give way
or get out of order.
I will describe my invention as applied to screw spanner or wrenches.
The moveable jaw slides freely on bar of spanner; a slot being cut out of the
said bar for the screw to work in. The moveable jaw having a solid projection on
the inside of both cheeks which work (the projections) in the slot of the bar.
These projections have a worm or thread cut in them, & the screw, having a
milled head at the top, being turned either way causes the jaw to move up or down
the bar.
I will now proceed to describe with reference to the accompanying drawing the
manner in which my invention is to be performed.
Fig. 1 is a front elevation.
Fig. 2 is a section in the same position.
Fig. 3 is a side section.
Figs. 4 & 5 are sections of the handle.
Fig. 6 is a plan of the moveable jaw.
Fig. 7 is a plan of the top of the spanner without the screw.
The same letters of reference indicate corresponding parts, in the several figures
of the drawing.
bis the moveable jaw with projections ff Fig. 6 with thread or worm e inside.
a a is the bar with the slot i in it, on which the moveable jaw b slides. d is the
screw which is rotated in slot i & causes the jaw to move up & down bar a a.
H is a small screw or rivet, working in a garter in the screw to prevent it coming
out of place.
C is the handle portion of the bar a a & is hollowed or grooved on both sides to
allow the jaw to pass up into its place.
Having now particularly described the nature of my said invention I declare that
what I claim is.
Firstly. The improvement in screw spanners or wrenches in which the screw for
operating the moveable jaw works in a longitudinal slot in the bar; the said bar
supporting & protecting it, on both sides, along its entire length. The traversing
or sliding of the moveable jaw, being effected by the operating screw passing
between the screwed projections, inside the cheeks of the moveable jaw.
Secondly. The general arrangement or combination of the parts namely, the
slotted bar, the screwed projections in the cheeks of the moveable jaw, & the
hollow or grooved handle, substantially for the purpose as described & illustrated.
Dated this 17th day of November 1892.

page_text: COMPLETE SPECIFICATION.
Moveable Screw Spanner or Wrench.
I, JOHN HERBERT WYNN, Tool Manufacturer, of Commercial Street,
Birmingham, in the County of Warwick, 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 :-
This invention relates to the manner in which I construct and arrange a movable
screw spanner, or wrench, whereby the screw and other parts or details of the
moving or shifting mechanism is more securely and compactly disposed or located,
than in the movable or shifting spanners at present in ordinary and general use.
In carrying my invention into effect I preferably construct the head, guide bar,
and handle of my movable spanner or wrench in one and the same piece from
wrought steel or other suitable metal. I make the handle portion of a grooved or
other form convenient for grasping or holding by the hand. The operating screw
I pass through a plain hole or passage in the head of the spanner and thence
through a nut or screw thread, or worm, formed within the movable or sliding jaw.
The movable jaw is arranged to slide on the guide bar beneath the spanner head,
The screw
the centre of the bar being slotted out for the reception of the screw.
is operated by the simple turning or revolving of a milled or other suitable finger
head, but it is prevented from any other than a circular motion by its contact with
the head of the spanner in the one direction, and in the other direction by means
of a small screw or rivet projecting into a groove formed around the upper and
plain portion of the screw, or by a small plate or strap cap fixed to the spanner
head. Thus when the screw is turned in either direction it has no rectilineal
movement itself but imparts such movement to the sliding jaw through which it is
threaded, and in this manner the jaw is moved nearer to or away from the fixed head
as may be required.
In order that my invention and the method of carrying the same into effect may
be the more clearly understood, I append hereunto one sheet of explanatory
drawings to be hereinafter referred to
Figure 1 is a front elevation of the spanner or wrench.
Figure 2 is a part sectional elevation showing the head A partially in section
with the screw removed, and with the slotted guide bar B shown passing through
the movable jaw C.
Figure 3 is a sectional plan.
Figure 4 is a sectional elevation of the movable jaw C showing the two sides BB
of the slotted guide bar; and also the screw D in position, with projections fƒ¹
upon the movable jaw C engaging with it.
Figure 5 is an end elevation and Figure 6 a front elevation of the spanner head,
showing the methods of preventing rectilineal movement of the screw by means of
a strap or cap such as E, secured to the spanner head by the screw or rivets e e.
Figure 7 is also a front elevation of the spanner head showing a strap or plate E
secured at one side of the head only. The plate E is arranged to be flush with the
general outline of the head and this is the modification preferred by me.
Instead of employing a strap or small plate fixed and supported on each side of
the screw as shown in Figures 5 and 6, I sometimes employ a retaining strap E
(Figure 7) fixed to the spanner head on one side only of the screw, by screws or
rivets as e, and I make other modifications in the details of my movable spanner
or wrench without departing from the essential features of my invention.
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. An improved screw spanner or wrench having the operating screw arranged

page_text: centrally within a slot or passage formed through a guiding bar, substantially as
hereinbefore described and as illustrated in the accompanying drawings.
2. An improved screw spanner or wrench having a movable jaw containing a
central slot or passage for the reception of the handle and guide bar; a nut, screw
thread, or worm being formed through the centre of the slot for the reception of
the operating screw, substantially as hereinbefore described and as illustrated in the
accompanying drawings.
3. In a screw spanner or wrench, the combination and arrangement of a centrally
placed operating screw such as D passing right through a fixed head such as A
and having a movable jaw such as C working on a slotted handle and guide bar
such as B B substantially as herein before described and as illustrated in the
accompanying drawings.
4. In a screw spanner or wrench, a sliding jaw with projections as ƒ ƒ'
(Figure 4) engaging on each side of a screw as D which operates in a slot in the
guide bar on which the jaw slides, the handle of the said wrench being arranged
to allow the sliding jaw with its projections to slide over the end to be placed in
position.
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