Rucksack with backrest provided with elastic strip

Abstract: Associated to the backrest (2) of a rucksack (1) is an elastic strip (6) set in the vertical direction of the backrest (2), the strip (6) lying in a plane parallel to the backrest (2) and having its ends operatively connected to the backrest (2) in such a way that a deformation due to bending of the backrest (2) according to the dorsal arch of the user generates an elastic reaction of the aforesaid strip (6) tending to cause the backrest (2) to return into the undeformed condition so as to favour correct resting of the rucksack on the spine of the user.

Description: The present invention relates to rucksacks of the type indicated in the preamble of claim 1 (see EP 0 104 538 A). The purpose of the present invention is to provide a rucksack of the type specified above that will guarantee or in any case will favour as much as possible a correct posture of the user, and in particular correct resting of the rucksack on the user's spine, with particular regard to the possibility of the load carried in the rucksack being relatively heavy, as, for example, frequently occurs in the case of rucksacks for school children. With a view to achieving this purpose, the subject of the invention is a rucksack as set forth in claim 1. Thanks to the above characteristics, the rucksack according to the invention can advantageously have the function of elastic stiffening for it to rest correctly on the spine of the user, this advantage being absent in the rucksacks made up to now. Further characteristics and advantages of the present invention will emerge from the ensuing description, with reference to the attached drawings, which are provided purely to furnish a non-limiting example, and in which: Figure 1 is a perspective view of a preferred embodiment of the rucksack according to the invention; Figure 2 is a sectional view of the rucksack of Figure 1, in the condition of use; Figure 3 is a perspective view of just the backrest of the rucksack, viewed from inside, with the remaining part of the rucksack indicated only by a dashed line; and Figures 4 and 5 are sections according to the lines IV-IV and V-V of Figure 3. With reference to the drawings, the number 1 designates, as a whole, a rucksack for school use, comprising a backrest 2 made up of a panel of plastic-foam material provided with a lining. The technology with which the backrest 2 is produced is not illustrated in detail herein since it is widely known and in itself does not fall within the scope of the invention. Again according to conventional techniques, along the perimeter of the backrest 2 a fabric bag 3 is sown which defines, together with the backrest 2, the body of the rucksack and is provided with an openable covering flap 4 for access to the inside of the rucksack. Again according to conventional techniques, the backrest 2 is made out of a single piece with a bottom padded portion 5 (see Figure 3). According to the invention, on the inside of the backrest 2 an elastic laminar strip 6 is set, which extends in the vertical direction of the backrest 2 with its plane parallel to the plane of the backrest. In the case of the example illustrated, the strip 6 consists of a single element of plastic material, for example nylon, having a top end secured, by means of a screw 7, to a circular plate 8 made of plastic material, the said circular plate 8 being set on the outside of the backrest 2 and being advantageously usable for bearing on its top a trade mark or the like (see Figures 1 and 4). The bottom end of the strip 6 engages in a sliding way with a loop 9 carried by the backrest 2 on the inner side of the latter and having ends 9a which engage through slits 10 made in a counterplate 11 set on the outside of the backrest (see Figure 5). Of course, the way in which the loop 9 is fixed to the backrest 2 may also be altogether different from the one illustrated in Figure 5 simply to provide an example. As may be seen from Figure 5, the strip 6 (and consequently also the loop 9) have a centrally arched profile and two flanges with coplanar plane ends 6a. With reference again to Figure 1, the rucksack 1 comprises a pair of shoulder straps 12, each having ends secured to the rucksack, one end of each strap being secured in the vicinity of the top part of the backrest 2, and the other end of each strap being secured in the vicinity of the bottom part of the backrest 2. As may be seen in Figure 2, when the rucksack according to the invention is being used, i.e., with the user's arms through the shoulder straps 12, a bending deformation of the backrest 2, which causes a consequent bending deformation of the strip 6, is generated. Thanks to its elastic characteristics, the strip 6 consequently exerts an action of return of the backrest 2 towards the undeformed condition, which forces the user to maintain a correct posture. A possible incorrect posture of the user's spine would in fact lead to a greater bending deformation of the backrest 2 which is countered by the strip 6. The user is thus to some extent forced to maintain as far as possible a correct posture, with consequent reduction in the risk of damage to the back due to carrying a very heavy rucksack in an incorrect way. As may be seen in Figures 1 and 3, the backrest of the rucksack according to the invention is moreover characterized in that it presents a shape like an hourglass, with a central portion 2a of reduced width which proves advantageous both from the aesthetic standpoint and from the ergonomic standpoint, in that the rucksack in this way has a more tapered and less sharp-edged overall shape. Of course, without prejudice to the principle of the invention, the details of construction and the embodiments may vary widely with respect to what is described and illustrated herein purely for the purpose of providing an example, without thereby departing from the scope of the present invention. In particular, the conformation and arrangement of the strip means may even be altogether different from the ones illustrated hereinbefore purely to provide an example. It would thus be possible to adopt two or more lamina-type springs arranged in a pack or in parallel according to the stiffening characteristics that it is intended to obtain.

Claims: A rucksack comprising a body, having a backrest (2) and a bag portion (3), and and a pair of shoulder straps (12), each strap having one end connected to the bottom part and one end to the top part of the body of the rucksack in the vicinity of the backrest (2), and elastically bendable strip means (6) associated to said backrest (2) in form of an elastically bendable lamina or strip (6) set in the vertical direction of the backrest (2) and lying in a plane parallel to the backrest (2), said strip (6) having one first end secured to the backrest (2) and a second end connected to the backrest (2) with the possibility of relative displacement in the vertical direction of the backrest, characterized in that said backrest is a padded backrest defined by a panel of foamed plastic provided with a lining, said bag portion is secured to the perimeter of said padded panel defining the backrest of the rucksack, said elastically bendable strip is arranged on the side of the backrest facing the inside of the bag portion and has its second end freely slidable through a loop (9) fixed to the backrest and also arranged on the inside of the bag portion, in such a way that a deformation due to bending of the backrest according to the dorsal arch of the user generates an elastic reaction of the aforesaid strip (6) tending to cause the backrest to return to the undeformed condition, and wherein the aforesaid backrest (2) has a basically hourglass configuration, with a central part (2a) of reduced width A rucksack according to Claim 1, characterized in that said strip (6) has a one-piece body of plastic material with a cross-section having a centrally arched profile and two coplanar end flanges, said loop (9) having a similar cross-section. A rucksack according to Claim 1, characterized in that said first end of the strip (6) is rigidly connected to the backrest (2) by means of a screw (7) that engages a plate (8) set on the outer face of the backrest (2) and usable for bearing on it trade marks or the like.

Inventors: ROTA PAOLO, ROTA, PAOLO
Applicants: DIADORA INVICTA SPA, DIADORA-INVICTA SPA
Application year: 2000
Main classification: A45F3
IPC codes: A45F3