The present invention relates to a work bag or travel suitcase with an incorporated extendable pull handle and with wheels .

The most widely varied solutions have been progressively studied for the easy and comfortable transporting of items and documents in the field of work bags and/or travel suitcases. These are normally associated with generally standard structures equipped with wheels and more or less extractable pulling devices.

Some of the known solutions envisage a U-shaped handle on a short side of a bag or suitcase, whose ends are inserted inside the bag or suitcase in a rest position. For use, in collaboration with a device which allows a pair of withdrawn wheels, said handle is also released and can be extracted in an extended position. An example of this kind of solution is disclosed in US patent 3,917,038. This solution, however, only allows the suit-

case or bag to be pulled in a tilted position and requires a complicated mechanism for the extraction or re- entering rest position of the wheels and handle in the respective seats . Other solutions such as those shown for example in U.S. patents 3,948,365 and 3,805,529, envisage a grip element hinged to an end side of the bag or suitcase, which can be moved from a rest position parallel to said side and a rotated and extracted pulling position of the bag or suitcase. In addition to production difficulties, this solution also has considerable encumbrance and difficulty of use.

There are also other solutions, mainly in the field of suitcases, wherein the pulling mechanism is mostly contained in the suitcase, occupying a large amount of space. These solutions are consequently not suitable for being used in a bag or the like, as the very nature of the container provides extremely limited containment space . Furthermore, in the solutions so far adopted, the application of the grip element and wheels in the suitcase or bag distorts the overall design of their line which is therefore adapted to the presence of these auxiliary elements. An objective of the present invention is to provide

a work bag or travel suitcase which, although equipped with a pull handle and wheels in the pulling phase, has an extremely encumbrance of said auxiliary means, at the same time however being comfortable to use. Another main objective of the present invention is to provide a work bag or travel suitcase which, although equipped with a pull handle and wheels, maintains the original line of the bag or suitcase without any additional auxiliary element. A further objective of the present invention is to provide a work bag or travel suitcase which above all has an extreme constructive simplicity, does not require any particular expedients in the framework of its structure or in the parts of the case occupied by the pull handle, and is easy to use.

An additional objective of the present invention is to provide a work bag or travel suitcase which can adopt a common predefined structure suitable for producing a pull handle, which is simple and sturdy. Yet another objective of the present invention is to provide a supporting and containment element for a pull handle, i.e. a pulling device which can be applied to a work bag or travel suitcase.

These objectives according to the present invention are achieved by providing a work bag or travel suitcase

as specified in claim 1.

Further constructive characteristics are disclosed in the enclosed dependent claims .

The characteristics and advantages of a work bag or travel suitcase according to the present invention will appear more evident from the following illustrative and non-limiting description, referring to the enclosed schematic drawings, in which: figure 1 is a perspective view of a bag according to the present invention in a first position for use and transportation, with the pull handle in an extracted position and a partially sectional edge, figure 2 is a perspective view from below of the bag of figure 1, with the pull handle almost completely con- tained inside the bag encumbrance, figure 3 is a perspective view of the supporting and containment element alone with the relative pull handle inserted therein, figure 4 is a perspective view similar to that of figure 3 in which the handle is partially extracted from the supporting and containment element, figures 5 and 6 are a schematic plan view and a raised side view of the supporting and containment element with the relative pull handle extracted therefrom, figure 7 is an exploded view of the parts which form

what is illustrated in figure 3, figures 8 and 9 show a plan and front view of a single wheel arranged in a specific support for application to the bag of the invention, figures 10, 11 and 12 respectively show an exploded perspective view of the supporting and containment element, and two partial sections assembled in different positions of a further embodiment, figures 13, 14 and 15 respectively show an exploded perspective view of a second embodiment of a supporting and containment element, and two partial sections, assembled in different positions of a further embodiment, figures 16 and 17 show a sectional and raised side view of a wheel arranged in a specific support for appli- cation to a bag.

Figures 1 and 2 show embodiments of a travel bag 11 equipped with an extractable pull handle 12, situated inside a supporting and containment element 13 constrained to a framework 14 of the bag 11. In general, as in the non-limiting example of the figures, the bag or suitcase has a parallelepiped shape, defined by the internal framework with an outer covering 15, made of leather or other high-quality or equivalent material . The travel bag 11 therefore has a pair of side walls

or sides having a greater width 16, 17 and a pair of side walls or heads having a limited dimension 18, 19. In addition to these side walls or sides 16-19, the bag 11 is completed by a lower wall 20 and an upper wall 21, equipped with a normal grip handle 22 for hand transportation.

Both the side heads 18 and 19 and the upper wall 21 can generally be equipped with one or more zips or similar devices 32 suitable for identifying openings for the introduction of items into the bag.

Furthermore, according to the present invention, the supporting and containment element 13 is provided for the pull handle 12.

In particular, said supporting and containment ele- ment 13 is constrained in the lower wall 20, in the side having a greater length and lesser width. In particular, the pull handle 12 is constrained to the end 23 of two flat rod elements 24, in the example with a rectangular section, which can be extracted from the supporting and containment element 13. In the example shown, the supporting and containment element 13 comprises two pairs of flat tubular elements 25a and 25b, with a rectangular section, which are inserted and move inside each other, in which the freely moving extractable rod elements 24 are inserted. The first two tubular elements 25a are con-

nected by end cross-bars 26, which have holes 27 for constraining elements, such as screws, not shown, to the framework 14 of the bag 11. The second two tubular elements 25b are in turn inserted and move in the first two tubular elements 25a.

Both the second tubular elements 25b and the rod elements 24 envisage conical or wedge-shaped rear ends 40 and 41. Thanks to their conical configuration, said conical ends 40 and 41 block the parts between them, when in an extracted position. Said conical formation can be pro- duced for example with portions of walls having a varying thickness. This reciprocal wedging between the parts can be subsequently disengaged by means of a light pushing action on the pull handle 12 causing the telescopic in- sertion of the elements inside each other.

In a particular further embodiment, in addition or as an alternative to this wedge-shaped end, magnetic elements 42 can be envisaged, indicated with the dotted-and- dashed line in figures 5 and 7, which interact with me- tallic ends, schematized in 43 and arranged on said pairs of tubular elements 25a and 25b at outward-facing ends.

In this way, a blocking position of the elements is established in an extended position (figures 5 and 6) which however can be easily disengaged for returning the various parts to a closed position by means of a pushing

action.

This arrangement is obtained as a result of the processing precision of the elements in question, for example obtained by moulding with extremely forced toler- ances . A precise processing also produces a blockage which can be easily released with a slight pressure on the handle .

It should also be noted that the various elements of the telescopic arrangement can be inserted into each other in only one direction and cannot be extracted in the opposite direction, i.e. by pulling the handle, also due to the presence of undercuts 44 which in any case prevent their extension.

Figures 10, 11 and 12 show a further particularly advantageous embodiment of the arrangement of the first and second tubular elements 25a, 25b and rod elements 24. In this alternative arrangement, the second tubular elements 25b and the rod elements 24, both extendable with respect to the first tubular elements 25a, have stable reciprocal positioning elements both in a completely extracted position and in a partially extended position.

The final rod elements 24, in fact, are close to ends facing the second intermediate tubular elements 25b each in a seat with a pass-through slot 45. Each slotted seat 45 is suitable for receiving a pair of magnetic ele-

merits 42 whose polarities repel each other, in opposite directions outside the respective slotted seat 45.

The ends of the second tubular elements 25b facing the rod elements 24, each have a pair of pass-through slotted seats 46, situated in the outward-facing wall. In each of these seats 46, there is a respective plate of magnetic material 47, for example iron, with a hooked shape and profile on one side, which only partially occupies the thickness of the seat 46. A cover element 48, internally hollow, is positioned on these ends of the second tubular elements 25b to keep the plates in position in the respective slotted seats 46.

Figure 11 shows the action of the magnetic elements 42 arranged in the pass-through seats 45 in a partially extracted position of the rod elements 24 from the second tubular elements 25b. In this position, in fact, the magnetic elements 42, which repel each other, rest on the internal surface of the second tubular elements 25b. Friction is generated, which is such as to keep the ele- ments fixed in the position where they have been pulled, even if they are arranged in a vertical position, unless a pushing action is exerted thereon.

Figure 12, on the other hand, shows how the various parts are arranged in a completely extracted position of the rod elements 24 from the second tubular elements 25b.

In this position, in fact, the magnetic elements 42, which repel each other, at least partially protrude from their seats 45, are at least partially inserted in the seats 46 where the iron plates 47 are situated. This insertion causes a firm blockage between the parts so that the rod elements 24 are stably extended to the maximum outside the second tubular elements 25b. With a minimum effort, it is possible to exert pressure on the rod elements 24, i.e. on the handle 12, disengaging the plates 47, magnetic elements 42 and respective seats 46, and allowing a return positioning of the rod elements 24 inside the second tubular elements 25b.

Figures 13, 14 and 15 show another embodiment of the arrangement of the first and second tubular elements 25a and 25b and rod elements 24 to be applied as a pulling device for a work bag or travel suitcase which, as in the previous example, has stable reciprocal positioning elements both in a completely extracted and in a partial extended position. As in the previous case, there are slot- ted seats 45 and magnetic elements 42.

As far as the second tubular elements 25b are concerned, each has a pair of pass-through slotted seats 146. In each of these seats 46, there is an integral, for example glued, iron plate 147 which only partially occu- pies the thickness of the seat 146.

Figures 14 and 15 show how the action of the magnetic elements 42 arranged in the seats 45 is equiva- lently exerted, generating friction as mentioned above.

Figure 15 in particular shows how the various parts are arranged in a completely extended position of the rod elements 24 from the second tubular elements 25b. The magnetic elements 42, which repel each other, at least partially protrude from their seats 45, are at least partially inserted in the seats 146 where the iron plates 147 are positioned, causing blockage between the parts. The engagement and disengagement between the parts take place exactly as described above .

This arrangement is particularly safe, advantageous and simple from a construction and functioning point of view.

Furthermore, according to the invention, in correspondence with rear and lower edges, the framework 14 has a pair of wheels 28 situated inside specific supports 29 constrained thereto. The wheels 28 consist of a pair of disks 35 made of titanium, at the side of a central core 36 made of teflon or similar material. An 0-ring 37 forms the tyre of said wheels, housed between the titanium disks and teflon core. In this way, thin, silent and shock-resistant wheels are obtained. In particular, the titanium disks 35 practically form an extremely hard

"rim" which is not marked when descending steps, running into obstacles or hitting edges .

Figures 16 and 17 show how the wheels 128 are obtained by means of a circular centrally perforated ele- ment 135, in which a bearing or similar rolling element 55, possibly also a brass as sliding element, is positioned for interference. To the side of the bearing 55 there are two semi-flanges 50 and 51 which act as a spacer for allowing free rotation of the wheels 128 and also have seats 52 for a supporting pin 53. The wheels are made of carbon/aluminum iron alloy or the like and have a ring 137 which acts as a tread, made of a thermoplastic elastomer, or rubber, or thermosetting thermoplastic polymer which facilitates a fluid, silent and comfortable sliding movement.

The wheels 28 or 128 are slightly protruding from openings 30 situated in the outer cover 15 of the travel bag 11, in the example in the lower wall 20.

In particular, according to the present invention, both the supporting and containment element 13 and the extractable rod elements 24, not only have a flattened shape with any section, but are also made of a light, particularly resistant material, also to shear and flex- ural stress. This material, for example, can be a compos- ite material, such as a laminate of carbon fibre, glass

or aramidic fibres, spectra, etc. or the like.

In the example, moreover, the supporting and containment element 13 is advantageously situated outside said framework 14 and inside the outer cover 15. In this way, this auxiliary element is completely hidden and has a minimum encumbrance so that it does not disturb the overall aesthetic appearance of the work bag or travel suitcase. When in a withdrawn position, with the flattened rod elements 24 completely inside the tubular ele- ments 25 of the supporting and containment element 13, the whole pulling group is not visible, also because it is partially enveloped by the cover.

This arrangement consequently does not disturb or limit the internal space of the work bag or travel suit- case defined by the framework 14.

Figure 2 clearly illustrates this specific characteristic of the present invention.

Figure 1 shows how to act when the bag must be moved not by hand transport with the gripping handle 22, but is pulled.

By acting on the pull handle 12, this is extracted from the supporting and containment element 13. This occurs because, by pulling the pull handle 12, the flattened rod elements 24 slide inside the tubular elements 25 of the supporting and containment element 13, where

they were previously contained.

Consequently, by tilting the bag as shown in figure 1, it is possible to move it along the floor thanks to the presence of the wheels 28, pulling it with the pull handle 12. It has already been specified that although the rod elements 24 are flat, they have a particular resistance, also to shear stress, allowing a safe pulling action.

When this necessity is no longer required, the re- insertion of the rod elements 24 in the tubular elements 25 of the supporting and containment elements 13, returns the bag to the minimum encumbrance position proposed in figure 2. Thanks to the minimum protrusion of the wheels and arrangement of the supporting and containment element 13 in the lower part of the bag, the bag resembles a normal bag which can be used with the grip handle 22 alone, maintaining a perfect aesthetic appearance.

According to the present invention, the advantages required with respect to the known art relating to both the bag and light and functional pulling device, are therefore achieved.