TOOL FOR INSERTING A THREADED PART INTO AN AREA DIFFICULT TO ACCESS

OUTIL SERVANT A PLACER UNE PARTIE FILETEE DANS UNE ZONE DIFFICILEMENT ACCESSIBLE

English Abstract

A tool for inserting a threaded part (1), comprising a fixing head (2) that
holds the
threaded part (1) such that it cannot turn and is connected to the one end of
a guide rod
(3) while the other end projects from the area difficult to access. The object
of inserting a
threaded part, for example a nut, into an area difficult to access is solved
in that the fixing
head (2) is provided with a grooved recess (5) that extends at a right angle
to its
longitudinal axis and holds the threaded part (1) with frictional force, at
least in some
sections, between the two opposite-arranged, parallel surfaces (6), extending
in a
direction where the thread axis is at a right angle to the longitudinal axis
of the fixing
head (2).

French Abstract

L'invention concerne un outil servant à placer une partie filetée (1) dans une zone difficilement accessible et comportant une tête de maintien (2) qui reçoit la partie filetée (1), empêche sa torsion et peut être reliée à une extrémité à une barre de guidage (3) dont l'autre extrémité fait saillie hors de la zone difficilement accessible. L'invention vise à permettre le placement de la partie filetée, par exemple d'un écrou, dans une zone difficilement accessible. A cet effet, la tête de maintien (2) présente un évidement (5) en forme d'encoche et à angle droit par rapport à son axe longitudinal, qui reçoit en liaison de force la partie filetée (1) au moins partiellement entre ses deux surfaces parallèles opposées (6), dans une direction telle que l'axe du filetage est perpendiculaire à l'axe longitudinal de la tête de maintien (2).

Claims

PATENT CLAIMS
1. A tool for inserting a threaded part (1) into an area difficult to access,
said tool
comprising a fixing head (2) for holding the threaded part ( 1 ) such that it
cannot
turn, which head can be connected to the one end of a guide rod (3) while the
other end projects from the area difficult to access, wherein the fixing head
(2) is
provided with a grooved recess (5) that extends at a right angle to its
longitudinal
axis and holds the threaded part (1) with frictional force, at least in some
sections,
between its two opposite-arranged, parallel surfaces (6), extending in a
direction
where the thread axis is at a right angle to the longitudinal axis of the
fixing head
(2),
characterized in that the fixing head (2) can be connected via a connecting
mechanism (8) to one end of the guide rod (3) and can thus be replaced with
another, differently dimensioned fixing head (2).
2. A tool according to claim 1, characterized in that the two opposite-
arranged,
parallel surfaces (6) are provided with at least one spring that holds the
threaded
Part (1).
3. A tool according to one of the claims 1 or 2, characterized in that the
distance
between the two opposite-arranged, parallel surfaces (6) of the recess (5) can
be
changed.
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4. A tool according to one of the claims 1 to 3, characterized in that the
fixing head
(2) between the parallel surfaces (6) is provided with at least one permanent
magnet (7) that holds the threaded part (1).
5. A tool according to one of the claims 1 to 4, characterized in that the
fixing head
(2) is provided with at least one other permanent magnet (11) on its front,
which
holds the threaded part (1).
6. A tool according to one of the claims 1 to 5, characterized in that the
length of
guide rod (3) can be changed, in particular with tubes (9, 10) that can be
telescopically pushed into each other.
7. A tool according to one of the claims 1 to 6, characterized in that the end
of guide
rod (3), which projects from the area difficult to access, is provided with a
handle
(4) of wood, plastic or rubber or is provided with a layer of one of these
materials.
8. A tool according to one of the claims 1 to 7, characterized in that the
fixing head
(2) and the guide rod (3) have an essentially cylindrical design.
9 A tool according to claim 8, characterized in that the fixing head (2) is
provided
with another recess (12) above and below the grooved recess (5) for
accommodating a threaded part (1), consisting of a nut and connected cylinder-
shaped, curved washer or a corresponding one-piece component.
7

Description

CA 02379724 2002-02-04
DESCRIPTION
Tool for Inserting a Threaded Part into
an Area Difficult to Access
The invention relates to a tool for inserting a threaded part, in particular a
nut, into
an area difficult to access, for example inside a bore in a wooden beam. The
tool consists
of a fixing head that holds the threaded part in such a way that it cannot
turn. The fixing
head can be connected to the one end of a guide rod while the other end
projects from the
area difficult to access.
A tool of this type is known from the US-PS 5,052,253 and is used to guide the
tip of a screwdriver into the slot of a screw, with the aid of a sleeve fitted
over a
screwdriver, and to hold the screw in this position for screwing it into the
thread of a deep
bore. The axis of the screwdriver for this known tool coincides with the axis
of the
screw.
In metal construction and wood construction, the problem frequently arises
that a
screw must be screwed into the thread of a threaded part, for example a nut,
for which the
thread axis is at a right angle to the tool used for inserting the nut.
In those cases, the problem was solved, in particular in metal construction,
by
gluing on or welding on the threaded part of the nut well ahead of time, while
the location
was still accessible.
In the area of wood construction, this problem occurs, for example, if the
rafters
of a roof truss extend into an inside area and are visible there. To screw
these rafters with
the aid of a tensioning connector to a beam supporting the rafters, it must be
accepted that
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CA 02379724 2002-02-04
the screw head remains visible and can be designed as decorative head, or the
nut remains
visible, so that domed cap nuts must be used. The screw head or nut can also
be
countersunk in the rafter and the remaining hole plugged with a wooden plug.
These
solutions are not very elegant and disturb the view of the otherwise smooth
planes of the
rafters.
To avoid this problem, it is suggested that a bore be drilled from the front
of the
rafter, which is not located on the inside, crosswise to the blind bore for
the threaded part
or the screw to the location where the threaded part or the nut must be
seated.
Unfortunately, however, it is nearly impossible to insert the threaded part or
nut at the
correct location, so that the problem could not be solved so far with this
suggestion.
Thus, it is the object of the invention to create a simple tool, which makes
it
possible to insert a threaded part into which a screw is screwed, for example
a nut having
a thread axis that extends at a right angle to the longitudinal axis of the
tool, into an area
difficult to access.
This object is solved with the features in claim 1 in that the fixing head is
provided with a grooved recess extending at a right angle to its longitudinal
axis, which
holds the threaded part, at least in some sections, such that it is
fractionally clamped
between its two opposite arranged parallel surfaces and the direction for the
thread axis is
at a right angle to the longitudinal axis of the fixing head.
One modification of the invention provides that the two opposite-arranged,
parallel surfaces have at least one spring for holding the threaded part, so
that the
threaded part is held securely inside the fixing head.
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CA 02379724 2002-02-04
It is furthermore provided that the distance between the opposite-arranged,
parallel surfaces of the recess can be changed to adapt to different
dimensions of the
threaded part.
In order to hold the threaded part securely and easily, the fixing head is
provided
with at least one permanent magnet between the parallel surfaces, wherein at
least one
additional permanent magnet is installed on the front of the fixing head for
extracting a
threaded part or other part.
To be able to use the tool for threaded parts with different dimensions, it is
furthermore provided that the fixing head can be connected via a connecting
mechanism
to the one end of the guide rod and can thus be replaced with another fixing
head of a
different dimension.
The guide rod is designed such that its position can be changed, particularly
with
the aid of telescoping tubes, to allow a maximum number of uses for the guide
rod.
Other advantageous embodiments of the invention are disclosed in the dependent
claims.
The advantages according to the invention are, in particular, that a threaded
part
can be inserted without problems into an area difficult to access and with the
aid of the
tool, especially a nut having a thread axis that extends at a right angle to
the tool axis.
One exemplary embodiment of the invention is shown in the drawing and is
described in further detail in the following. Shown are in:
Figure 1 A view from the side (partial section) of a tool according to the
invention
and next to it, a view from the side of a threaded part.
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CA 02379724 2002-02-04
Figure 2 A view of the tool front and next to it a side view of the threaded
part.
The tool according to Figure 1 consists of a fixing head 2 for holding a
threaded
part l, such that it cannot turn, which fixing head is connected to the one
end of a guide
rod 3, the other end of which is provided with a handle 4.
The threaded part 1 consists of a square nut to which a curved washer is
welded,
as shown in Figure 2. Thus, it is particularly suitable for use as a
tensioning connector
for connecting rafters of a roof truss to a transverse beam. For this, a bore
is drilled
crosswise to the blind hole bore for the screw from the front of the rafter to
a location
where the nut with curved washer is to be seated.
With the tool according to the invention, the nut can be moved easily to this
location by moving it in the arrow direction (Figures 1 and 2) toward the
fixing head 2
and is held in place by the attractive power of a first permanent magnet 7.
The nut fits
into a recess S and the curved washer into an additional recess 12. After
screwing the
screw of the tensioning connector into the thread of the nut, the fixing head
2 is released
again, so that the tool can be easily pulled from the bore.
The fixing head 2 is provided with a grooved recess 5 that extends crosswise
to its
longitudinal direction and holds the nut between its two opposite-arranged,
parallel
surfaces 6. The nut is held in place by the attractive power of the first
permanent magnet
7. An additional permanent magnet 11 is installed on the front of the fixing
head 2 and is
used, for example, for the easy extraction of a nut that may have been lost in
the blind
hole or the like.
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CA 02379724 2002-02-04
The fixing head 2 can be connected via a connecting mechanism 8 to the one end
of the guide rod 3 and can thus be exchanged with another fixing head 2 having
a
different dimension.
The length of guide rod 3 can be changed with the aid of two tubes 9, 10 that
can
be pushed telescopically into each other. A sectional view of the outer tube 9
is shown in
Figure 1, while the inner tube 10, which turns into the handle 4, is shown as
a view.
The handle 4 advantageously consists of wood, plastic or rubber or is covered
with a layer of one of these materials, such that it can be handled easily.

Representative Drawing