Year: 1897

page_text: We, VICTOR DAUSI and JOSEPH. JAEGER, both of 67, Rue de Wattignies, Paris,
France, Manufacturers, do hereby declare the nature of this invention to be as
follows:-
The object of the present invention is a new adjustable key for screws and nuts of
any dimension.
This key is composed essentially of a fixed jaw fastened to a socket forming the
arm of the lever and a movable jaw of a piece with a shank longitudinally cut off in
its lower part the walls of the incision or groove thus provided being screw-threaded
and receiving a fixing-screw constituting an interior bolt which is borne in the bottom
of the socket of the fixed jaw.
The fixed jaw forms the top of the socket which constitutes the handle of the
instrument. The thread of the fixing-screw forming the bolt is filed on two opposed
sides and enters with a soft friction into the hollow of the shank of the movable jaw
when the smooth parts are in juxaposition of the screw thread, if on the contrary the
thread of the bolt comes into contact with that of the shank it catches it on its way
and renders fast the distance between the jaws.
The tailpiece or shank of the movable jaw enters with a mild friction into the
socket, its course being limited by a joint pin riveted to the socket and only allows
of a distance between the jaws to a certain extent equal to a groove made in the
tailpiece..
The single threaded screw filed on two opposed sides is supplied with a furrow by
which it is fastened by two joint-pins which pass through the socket, the lower
extremity of which is closed by means of a plate.
In order to use the key the smooth part of the screw is opposed to the screw-
thread in the shank of the movable jaw when it will prove sufficient to pull the latter
so that its tailpiece may slide into the socket.
The distance of the jaws being limited by the height of the groove made in the
tailpiece, it suffices when the distance between the jaws has reached the dimension
of the screw or nut to be locked to turn the fixing-screw through a quarter of a
revolution so as to catch its thread into that of the shank; the distance between the
jaws is thus fastened and it is impossible to make the shank slide into the
socket.
Moreover it is to be observed that in multiplying the revolutions of the fixing-screw
the distance between the jaws diminishes and consequently increases the pressure of
said jaws on the screw or nut.
It is a matter of course that to release the jaws and permit the sliding of the
shank into the socket, it suffices to replace the fixing-screw into its former position
that is to say oppose its two smooth sides to the screwthread of the shank.

page_text: The opening and closing of the jaws are rapid, one might even say instantaneous.
They are effected without any strain and the fixing-screw cannot get dirty.
T
f 1007
L. DUVINAGE,
Agent for Applicants.
We, VICTOR DAUSI and JOSEPH JAEGER, both of 67, Rue de Wattignies, Paris,
France, Manufacturers, 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 :-
Screw-keys are implements of such importance to mechanics that, nothwithstanding
all the imperfections and defects they have hitherto presented their use has continually
increased. The greatest drawback with shifting-spanners is that so much time is
required to fix them in the desired position. With the latest improved shifting-
spanners the thumb-screw has to make a number of revolutions corresponding with
the length of worm, this thumb screw being sometimes very difficult to turn. More-
over considerable difficulty is experienced in oiling and cleaning this spanner
when it gets dirty.
Another defect of this spanner is that the larger the nut and consequently the
harder to turn, the weaker the spanner becomes while the length of the lever
does not increase.
The new spanner we are about to describe is free from all the above mentioned
defects. The opening and shutting of the claws are very quickly executed, in fact
almost instantaneously and without any effort; the screw cannot get dirty, the lever
which is always proportionate with the resistance to be overcome does not weaken on
account of the largeness of the nut to be turned; the proportions indicated in our
drawing are those of bicycle spanners; this tool can of course be applied to all sizes
of nuts and can be used to advantage in all branches of mechanics.
The annexed drawing which is given by way of example shows the new moving
spanner.
Fig. 1 is a longitudinal section of the spanner.
Fig. 2 shows the movable claw connected with its prolongation.
Fig. 3 shows the fixed claw provided with a socket which forms the lever for screwing
or unscrewing the nut.
Fig. 4 shows the screw D forming an interior bolt.
Fig. 4bis shows the same screw D (the bolt being shut).
Fig. 5 is a profile section of the movable claw and its tail.
Fig. 6 a profile of the fixed claw and its socket forming the lever-arm.
The movable claw A is connected with its extension a¹. The lower part of this
extension is cut at a¹¹ and its lower end is hollowed at a³ and partly provided with a
tapping a into which the screw. D is fitted (Fig. 4) to form a bolt. The fixed claw B
(Fig. 3) forms the head of the socket b' which constitutes the handle of the
tool.
The tail a¹ slides freely in the socket b¹ its course is limited by a pin G (Fig. 1) which
is rivetted to the socket b¹ and only allows the separation of the claws at a distance
equal to the height of the groove all made in the tail a¹. The screw with two opposite
sides filed (Fig. 4 and 4 bis) is introduced into the hollowing a³ (Fig. 2). This screw

page_text: is held with its neck C¹ (Fig. 4) by two pins 62 which pass through the socket b¹ whose
lower end is stopped by the plug K (Fig. 1) traversed by the pins b².
The working of the tool :-
When we wish to make use of this nut-wrench by means of the screw-head D¹ the
flat side of which is placed in the extension of the socket b' the smooth part of D is
fixed against the tapping a (Fig. 2) terminating the hollowing made in the tail a¹.
Then it suffices to draw the movable claw A in order that its tail a' might slide in the
socket 61; the separation of the claws being limited by the height of the groove all.
As soon as the separation of the claws has attained the dimension of the nut, it
suffices to give a quarter of a turn to the screw D to fit its thread in the tapping a¹ ;
the distance of the claws is then fixed and it is impossible to make the tail a' slide in
the socket b¹. We must note also that by increasing the revolution of the screw D,
we lessen the distance between the claws and consequently increase the pressure of
the said claws on the nut.
The head of the screw D instead of being flattened can of course be made in the
form of a cross hinge or any other way which facilitates the enclosure of the interior
bolt above mentioned and the working of the handle which is the lever-arm necessary
for screwing or unscrewing the tightest nuts.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what we
claim is :-
1. An improved spanner composed of a fixed claw B of a socket b¹ and of a
movable claw A forming a body with a stem a¹ whose lower extremity which is partly
hollowed, terminates with a tapping into which a screw D is fitted the filed
thread on the two opposite sides of which, enters freely the hollowing a³, when
the smooth parts are facing the tapping, whilst if the thread is in contact with
the said tapping it fits into its worm and keeps the separation of the claws
fixed, the tail a¹ of the movable claw A entering freely into the socket b¹.
2. An improved nut-key substantially as described and shown.
Dated this 4th day of vecem bhor TX4 7
December
L. DUVINAGE,
Patent Agent, 8, Rue des Princes, Brussels, Belgium.