WO1999061116A1

WO1999061116A1 - Inflatable apparatus

Info

Publication number: WO1999061116A1
Application number: PCT/GB1998/003247
Authority: WO
Inventors: Mark Andrew Williams
Original assignee: Footwall Limited
Priority date: 1998-05-27
Filing date: 1998-10-30
Publication date: 1999-12-02
Also published as: GB9811388D0; AU9638398A

Abstract

Apparatus is diclosed which is suitable for sports practice. The apparatus comprises a frame or wall for defining a target area toward which a user can direct a projectile. The frame or wall comprises pliable material and is supportable by means of an inflatable structure for providing a substantially rigid support for the frame. Weights may be inserted in the inflatable structure to weigh down the apparatus. A novel inflatable structure is also disclosed having cells acting on each other to support webs sandwiching the cells; the structure may be used for sports apparatus or other inflatable apparatus.

Description

INFLATABLE APPARATUS

In one aspect, the invention relates to an inflatable element which might be used, for example, as a supporting or structural element. In a further aspect, the invention also relates to inflatable apparatus for use for sports training or practice, or as a recreational toy. The apparatus is particularly suitable for training or practising ball games, for example tennis, football, cricket or baseball but is not limited to ball games.

Many different types of inflatable structures are known, for example, inflatable boats, beds and inflatable frameworks. Examples of sports apparatus (goals and nets) using inflatable frames, are illustrated, for example, in GB-A-2172509, WO-A-95/13847 and GB-A-2313322.

Inflatable structures are often used in situations in which a structure is required which can be erected easily and, after use, packed away into a small, light package for transportation and storage. However, existing designs of inflatable structures tend to be limited in terms of structural integrity and/or shape.

Broadly speaking, one aspect of the invention is to provide an inflatable structure comprising first and second webs, between which are arranged first and second cells distinct from the webs. When the cells are inflated, they apply pressure directly or indirectly on each other to thereby support the webs relative to each other. Preferably, the cells bear directly or indirectly against each other to tension the webs.

The invention can therefore provide a structure which uses the pressure exerted between two or more cells to provide support for first and second webs between which the cells are arranged. In preferred embodiments, the combination of the inflated cells and the webs can provide a self-shaping, self-supporting structural element.

The webs may be of any suitable form, For example, one or both of the webs could be in the form of strips, or filaments or tapes. However, in preferred embodiments illustrated herein, the webs are in the form of sheets. This can provide a sandwich-type structure, the webs forming the outer faces of the structure and sandwiching the inflatable cells therebetween. Preferably, the sheets are at least co-extensive with the cells.

Preferably, at least one of the cells (more preferably both the first and second cell) is or are attached to at least one of the webs (more preferably the cell or cells is or are attached to both webs). This can provide greater structural integrity, and also allow the structure to form a desired three-dimensional shape.

For example, by varying the relative sizes of the cells, and/or by varying the distance between the points at which the cells are attached to the webs, the structure can be designed to have a varying thickness, or to have a curved (concave or convex) or angled configuration.

The cells may have any desired shape. However, in preferred embodiments illustrated herein, the cells are formed as envelope structures. For example, each cell may consist of first and second flexible sheet portions secured together around the periphery of the cell. The cell may be isolated from the other cells, or the cell may be able to communicate with one or more other cells, for example, through one or more gaps left in the line of attachment around the cell periphery. In a preferred form, the first and second sheets are secured together by welding, for example, by high frequency (RF) welding.

As mentioned above, the cells may either be isolated from each other, or they may in communication with each other. Isolated inflatable cells tends to provide greater security against accidental deflation. However, this means that each cell has to be individually inflated prior to use, and deflated after use. Cells in communication with each other can provide easier inflation as a group, but tend to offer less security against accidental deflation. The cells may be arranged generally in parallel with other if desired. However, in a particularly preferred embodiment, the cells are arranged in a zigzag or fan-fold configuration.

In a particularly preferred construction, the plurality of cells is formed as a continuous strip, the cells being defined by first and second sheets which are welded at intervals to define the individual cells. The strip is received between the webs, and is secured to the webs in an alternating pattern, to define the zigzag configuration. This can provide a construction technique which is very simple, yet very versatile.

Preferably, the structure comprises a space between the first and second cells for receiving a weight for weighing down the structure. For example, the weight may be a container (e.g. a sack or tube) containing a relatively heavy substance, for example, water or sand. Preferably the container has an opening to enable it to be filled and emptied when desired. Preferably, the opening is releasably closable.

In a closely related second aspect, the invention provides an inflatable structure comprising first and second inflatable cells, and a container receivable in a space between the cells for weighing down the structure. Preferably, the container is in the form of a sack or tube. Preferably, the container has an opening to enable a relatively heavy substance, such as sand or water, to be placed within the container for use, or emptied from the container after use. Preferably, the opening is releasably closable.

This aspect of the invention can enable an inflatable structure to be weighed down internally, and also enable the structure to be weighed down evenly over a desired area. In the prior art, inflatable structures either tend to be attached external weights, or attached to an external weighted base.

Preferably, the container is retainable in position between the first and second cells by inflation of the cells. The cells can inflate against the container, to hold it in position by friction, or by other engagement. A preferred method of erection of the structure is to place the or each weighted container in the spaces between respective cells prior to inflation, and then to inflate the cells around the or each container. After use, the structure may be deflated, and the weighted containers removed, by a reverse process.

The above aspects may be used to provide inflatable structures for a variety of applications. Such applications include, for example, inflatable sports apparatus, inflatable furniture, inflatable tents, and inflatable boats. However, it is emphasised that this list is merely illustrative, not exhaustive.

Another aspect of this invention relates to sports practice walls. Such walls are used by professional sports people, professional trainers, coaches and the general public, against which ball games can be played, and general ball control skills practised. Some walls include special graphics, such as lines defining target areas, to help the player practise or play a game against the wall.

However, such walls are relatively expensive to build or install, and are in essence merely painted surfaces. Walls forming part of existing structures, such as buildings, are not always suitable for sports practice since painting target areas on the wall and/or the noise of walls impinging on the wall may not be acceptable to users nor owners of the building. Furthermore, an existing wall may not necessarily be located in the most convenient place for sports practice to take place, for example it may be adjacent a footpath or road.

In accordance with this aspect of the invention there is provided sports apparatus comprising an inflatable structure bearing a rebound wall or surface.

In a related aspect, the invention provides apparatus for sports practice comprising a frame or wall for defining a target area toward which a user can direct a projectile, the apparatus comprising pliable material and including distendible members for supporting the frame.

In a preferred embodiment of the invention the apparatus is collapsible when not in use. This provides a transportable apparatus which allows for the use of the apparatus in many areas, such as at the beach or in the park for recreational purposes. It also supports retail marketing of the apparatus to the general public for domestic or home use.

The frame or wall may comprise the distendible members, which are preferably distendible chambers such as air chambers, which may be inflated when ready to use the apparatus. This provides for a lightweight apparatus, further enhancing its portability. Any suitable inflation means may be used, such as air, other gas or even a liquid.

The apparatus may optionally comprise receiving means for a stiffener for enhancing the rigidity of the of the frame when the frame is in use.

Optionally, the apparatus further comprises a target surface for defining the target area.

The apparatus may comprise further stiffener, or receiving means for receiving a further stiffener for enhancing the rigidity of the surface during use. The further stiffener is typically planar. The further stiffener may, in some case, be provided as the target surface.

The surface may comprise projectile retaining means for monitoring accuracy of a user in aiming the projectiles towards the apparatus. Optionally, apertures may be provided in the surface through which projectiles may pass.

The rigidity provided to the apparatus by the inflatable structure and/or by the stiffeners (whether by the further stiffener or other stiffeners), is sufficient to cause a projectile impinging on the surface to rebound therefrom. Preferably, the sports apparatus includes an inflatable structure in accordance with the first aspect and/or the second aspect defined above.

In a further aspect, the invention provides a sports training or practice apparatus comprising a barrier wall which may optionally include one or more stiffening panels, and an inflatable structure positioned behind the wall to support the wall, in use. Preferably, the inflatable structure comprises a plurality of inflatable cells. Preferably, one or more spaces are provided for receiving weights internally within the structure to weigh down the apparatus. Preferably, the apparatus comprises one or more containers receivable in the space or spaces within the structure, for containing a relatively heavy substance, such as water or sand. Preferably, such spaces are provided at a variety of positions, so that the weight can be distributed around the inflatable structure.

Embodiments of the invention are now described, by way of example only, with reference to the accompanying drawings, in which:

Fig. 1 is a schematic view of a first embodiment of inflatable structure in its deflated condition; Fig. 2 is a schematic view of the structure of Fig. 1 in its inflated condition;

Fig. 3 is an exploded view of the structure of Figs. 1 and 2;

Fig. 4 is a schematic view illustrating communication between the cells;

Fig. 5 is a front perspective view of a second embodiment of inflatable structure;

Fig. 6 is a plan view of the second embodiment with a graphics sleeve fitted; Fig. 7 is a schematic view of a third embodiment of inflatable structure;

Fig. 8 is an exploded view of the embodiment of Fig. 7;

Fig. 9 is a schematic view of a further embodiment in accordance with the invention;

Fig. 10 is an exploded view of the embodiment of Fig. 9;

Fig. 11 is a schematic view of a yet further embodiment in accordance with the invention; Fig. 12 is a schematic view of a still yet further embodiment in accordance with the invention;

Fig. 13 is a schematic view of an embodiment in accordance with another aspect of the invention; Fig. 14 is a schematic view of a fiirther embodiment in accordance with the invention;

Fig. 15 is a schematic view of a further embodiment in accordance with the invention;

Fig. 16 is a schematic view of a further embodiment in accordance with the invention;

Fig. 17 is an exploded view of the embodiment of Figure 16;

Fig. 18 is an exploded view of a further embodiment in accordance with the invention; Fig. 19 is an exploded view of a further embodiment in accordance with the invention;

Fig. 20 is an exploded view of a further embodiment in accordance with the invention;

Fig. 21 is a front perspective view of a further embodiment in the form of an inflatable seat; and

Fig. 22 is a side view of the seat of Fig. 21.

Throughout the drawings like symbols or reference numerals are used to denote like parts, unless otherwise stated.

Referring to Figs. 1 to 4, an inflatable structure 10 consists generally of an upper web 12, and a lower web 14 which sandwich a core formed by a plurality of inflatable cells 16. The terms "upper" and "lower" are used herein merely with reference to the orientation illustrated in the drawings, and do not imply any limiting effect on the scope of the invention. The cells 16 are formed as a continuous strip, by a first sheet 18 and a second sheet 20 of flexible plastics material, which are secured together around their edges (at 22), and at intervals (at 24), to define the periphery of each cell 16. The strip is arranged between the webs 12 and 14 in a zigzag or concertina configuration, and is attached to each web alternately at positions 26 which in the illustrated arrangement are generally out of register with each other.

In a preferred form, the webs are made of plastics, and the webs and sheets are secured to each other by means of RF welding. In a particularly preferred form, the welds 24 and 26 can be made simultaneously. This can simplify the production process, and ensure that the cells 16 are dimensioned correctly.

When deflated (as in Fig. 1), the structure is generally flexible and is easily folded into a small size.

As the cells 16 are inflated (Fig. 2), the adjacent cells expand and bear against each other. Such expansion pushes the webs 12 and 14 apart, and also tensions the webs, as the cells 16 press against each other. The structure adopts a generally linear shape, with generally smooth, flat upper and lower surfaces (defined by the webs 12 and 14). Together, the webs and the arrangement of cells pressing against each other, can define a self-shaping element which has its own structural integrity (the extent of which depends on the inflation pressure of the cells 16).

This structure contrasts generally with prior art designs in which the exterior shape of the inflatable structure is generally tubular, or made up of tubular sections. The structure illustrated in Figs. 1 -4 can provide a generally flat surface, and be sufficiently rigid for practical uses.

The cells 16 may be isolated from each other, such that no gas (or other inflation agent) passes from one cell to another. This would provide a high degree of security against accidental deflation. However, it would also mean that each cell will require its own inflation/deflation valve. Alternatively, two or more of the cells may communicate with each other, such that the cells can be inflated together as a group. This would reduce the security against accidental deflation, but might simplify inflation of the cells, and reduce the number of inflation valves needed for the structure.

Fig. 4 illustrates how limited communication between the cells 16 may be achieved. In

Fig. 4, the welds 24 between adjacent cells is in the form of discontinuous weld segments, leaving narrow gaps 28 through which air can pass. Therefore, as one cell becomes inflated, the pressure in the cell can also inflate an adjacent cell communicating via the gaps 28.

As can be seen in Fig. 2, even in the inflated state, spaces 30 exist between adjacent cells 16, into which weighted containers 32 can be received to weigh down the structure if desired, for example, to help anchor the structure relative to the ground. The containers 32 may take any suitable form, but a particularly preferred form is a tube, having a closable opening (34) to enable the tube to be filled with, for example, water. Typically, the containers 32 are placed in the spaces 30 prior to inflation of the cells. When inflated, the cells expand around the containers 32, and hold them in place by frictional engagement.

As illustrated in a later embodiment (see Figs. 21 and 22), the structure 10 may be shaped by varying the "height" of the cells (as measured between the webs), and by varying the spacing between the welds 26.

The inflatable structure 10 may be used in a variety of different inflatable applications. A particularly preferred application is for an inflatable sports wall, as illustrated in Figs. 5 and 6.

Referring to Figs. 5 and 6, the sports wall 40 consists generally of a front face 42 formed of foldable plastics sheet. Received in pockets in the front face 42 are a plurality of generally rigid, planar rebound sheets 44, for providing a firm surface to enable a ball, or other projectile, to rebound from the face 42 upon impact therewith. Typically, the rebound sheets are made of plastics, wood, or particle board, and together fill the majority of the surface area of the front face 42. The rebound sheets 44 may be removable from the pockets, or they may be fixed in position.

Positioned behind the front face 42 is an inflatable structure 46, similar to the structure 10 described above. The same reference numerals are used where appropriate. The structure consists generally of a plurality of inflatable cells 16 which are secured to, and extend between, a rear sheet 48 (which corresponds to the first web 12) and the rear surface of the front face 42 (which corresponds to the second web 14). The cells form a generally zigzag configuration. In this embodiment, the cells are inflatable in pairs by means of an inflation valve 52, each adjacent pair of cells being isolated from an adjacent pair. This provides a degree of security against accidental deflation, yet does not require each cell to inflated individually.

The wall 40 is intended to form a rebound surface for use in playing, or practising, a ball sport, such as football, tennis, cricket, or baseball. In order to help anchor the wall, and to reduce the movement of the wall upon impact of a ball, the inflatable structure 44 includes spaces 30 for receiving weighted containers 32, as described previously. The containers 32 can be filled with, for example, water or sand, and placed in the spaces 30 prior to inflation of the cells 16. When the cells are inflated, the pressure exerted on the containers 32 is sufficient to retain the containers 32 in position.

If desired, each of the rebound sheets may carry a graphics image (or a respective segment of a graphics image), to present a suitable scene for the sport being played or practised. Target areas (not shown) may be depicted at which a player should aim a ball or projectile. The graphics image may be a picture, for example, a life-size action picture of a footballer to whom a simulated pass may be made by kicking the ball against the wall, a batsman standing at a wicket against which a ball is to be bowled, or a baseball hitter. Optionally, any suitable custom made graphic or scene can be depicted, such as a set of goal-posts, or a tennis set (for practising tennis). The target areas may be implicit (i.e. within the goal, or above the tennis net) instead of being explicitly marked as numbered areas.

In the illustrated embodiment, a removable sleeve 50 is provided which carries the graphics image. The sleeve is in the form of a closed loop of material, for example, vinyl or other flexible plastics sheet, and is fitted around the front face 42, the sides and the rear sheet 48 of the wall 40. The sleeve may carry one or more graphics images which can be presented by suitably aligning the sleeve relative to the front face 42. To fit the sleeve 50 in position, one or more of the cells 16 (preferably an end-most cell) is deflated at least partly, to allow the sleeve to be slid over and around the wall 40. The cells are then re-inflated to their full extent, to expand the structure, and thus hold the sleeve firmly in position. The sleeve 50 is interchangeable to enable a new sleeve with different graphics to be used when desired.

Typically, the wall 40 may have a front horizontal length of about 200cm, a front height of about 90cm, and a depth of about 600cm. The horizontal length at the rear may be about 160cm, and the rear height may be reduced somewhat to 80cm. Typically, five stiffening sheets are used, each having a horizontal width of about 38.5-40cm, and a height of about 88-90cm. The spacing between adjacent pairs of cells (i.e. the dimension "x" in Fig. 5) is typically about 40cm.

In the inflated condition, the combination of the cells 16 and the front face 42 and the rear sheet 48 provides a generally rigid structure against which a relatively heavy projectile, such as a football, may be aimed. The rebound sheets 44 provide a firm surface for optimum rebound characteristics, and the cells 16 bearing against each other and against the front and rear walls, provide rigidity of the structure as a whole. The weighted containers 32 provide sufficient weight to anchor the wall 40 in position during use. Moreover, the weight is distributed across the width, height and depth of the structure, to which provides better characteristics than, for example, if only a base portion were weighted, and other portions were unweighted. If desired eyelets (not shown) may also be provided to allow the base to be anchored using pegs.

To collapse the wall, the cells 16 are deflated. This allows removal of sleeve 50, and also of the containers 32 either by lifting out the containers 32 individually, or by lifting the wall and leaving the containers 32 behind. The containers can then be emptied, and the deflated structure then folded along notional fold lines between each of the rebound sheets 44. It will be appreciated that segmenting the front face 42 as a plurality of sheets 44 (or other segments) allows the front face 42 to be folded up once the cells 16 have been deflated. If desired, handles (not shown) may be provided to facilitate carrying of the wall in either its deflated or inflated state.

Although the above embodiment uses the inflatable structure of Figs. 1 to 4, the invention also contemplates other inflatable practice structures having different inflatable structures.

Further, although stiff panels are used as rebound sheets in the above embodiment, these may be omitted in other embodiments. For example, the rebound face of the wall could be constituted by a flexible sheet of plastics material which is supported by the inflatable cells. The cells can provide sufficient structural rigidity to achieve a substantially non- cushioning, (i.e. non absorbing) rebound characteristic.

Although the inflatable cells are described as being joined fixedly to the front and rear walls (or webs), it will be appreciated that the cells may be removable in other embodiments. For example, it is possible simply to arrange the cells (either individually or as a strip) within a sleeve such that the sleeve then acts as the front and rear webs tensioned by the cells. However, it is preferred that at least some of the cells be removably fastened to the inside faces of the sleeve for optimum structural integrity. For example, suitable removable fasteners may include hook-and-loop type fasteners, plastics buttons, male and female poppers, studs, hooks and tags, etc.

Mounting the cells in a removable manner may also provide for more straightforward manufacture of the structure, by avoiding having to perform selective welding of multiply stacked plastics sheets. It will also be appreciated that removable fasteners may allow easier replacement of defective or damaged cells should, for example, a cell suffer a puncture. Referring now to Figs. 7 and 8, a training/practice apparatus 100 comprises a wall 102 against which a player can aim a ball or other projectile. The apparatus 100 further comprises side walls 104, a top wall 106, a rear wall 108 and a base 110. The base 110 includes eyelet holes 112 distributed around its periphery in order to fix the apparatus 100 to the ground, by way of stakes for example. The dimensions shown in the drawing are by way of example only and embodiments of the invention are not restricted to such dimensions. Additionally, although apparatus 100 has been described with reference to a "landscape" mode (longest dimension of wall 102 parallel to the base 110), it may also be configured in "portrait" mode as shown by reference 120.

Wall 102 comprises a graphics sheet 122, of any suitable material, for example paper, vinyl or plastics, on which are marked target areas 1, 2, 3 and 4 at which a player should aim a ball or projectile. The graphics sheet 122 may carry a picture, for example, a life- size action picture of a footballer to whom a simulated pass may be made by kicking the ball against the wall, a batsman standing at a wicket against which a ball is to be bowled, or a baseball hitter. Optionally, any suitable custom made graphic or scene can be depicted, such as a set of goal-posts, or a tennis set (for practising tennis). The target areas may be implicit (i.e. within the goal, or above the tennis net) instead of being explicitly marked as numbered areas.

As shown in exploded view in Figure 8, the graphics sheet 122 forms a first part of the wall 102 which further includes hardboard stiffening members 124 and intermediate wall 126. Sheet 122 is attached to intermediate wall 126 by means of high frequency welded seams 128 or other suitable fixing means such as gluing, bonding or sewing, to provide a series of "pockets" to receive hardboard stiffeners 124 and to attach the sheet 122 and the intermediate wall 126 to the base 110. The hardboard stiffeners 124 may be retained in the pockets by thermo-bonding or welding sheet 122 to sheet 126 along the top seam 130, or alternatively the pocket may be open at the top to allow the hardboard stiffeners 124 to be removably inserted into the pockets. Apparatus 100 further comprises a series of air chambers 132, which when inflated serve to support the wall 102 in an upright position. The air chambers 132 are formed by a series of ribs 134, which are attached to the intermediate sheet 126, a rear sheet 136, the base 110 and top section 106 by means of impermeable air-tight seals such as may be formed by high frequency welding, heat bonding or gluing. The rear sheet 136 may continue across the top of the ribs 134, thereby forming the top section 106. Those parts of the apparatus shown without any hatching may suitably be of a plastics material such as P.V.C. or other vinyl. Optionally, other materials may be used, but those parts forming the air chambers should be of an appropriate impermeable material. A suitable hard wearing material may form the front sheet 122 of the wall 102. The sections 124 shown hatched are of hardboard, or any other suitable stiffening material which would serve to enhance the rigidity of wall 102 during use. Such material may be a stiff plastics, metal or composite material such as MDF Particularly, the stiffeners 124 comprise materials suitable for providing a rebound and/or impinging surface for receiving instant projectiles such as a ball kicked or thrown at the wall 102.

Suitable air inlet valves are provided corresponding to each air chamber. Preferably, the valves are connectable to a pump such as a foot pump or hand pump for pumping car bicycle tyres respectively, but may be suitable for blowing up the chambers by mouth.

Another preferred embodiment in accordance with the invention will now be described with reference to Figures 9 and 10. Figure 9 shows a practice/training apparatus 200 having a rectangular configuration, and comprising a front wall 102, side walls 104, a top wall 106 and a rear wall 108 attached to a base 110. Referring now to Figure 10, which shows an exploded view of apparatus 200, it can be seen that front wall 102 is configured in substantially the same manner as that described with reference to Figure 8. For clarity and brevity, wall 102 shall not be described any further. Wall 102 is supported in use by air chambers 204 having a substantially triangular cross-section. The prism shaped air chambers are fixed to intermediate sheet 126, bottom sheet 110, rear sheet 108 and top 106 by means of impermeable seams as described above with reference to Figures 7 and 8. As before, the air chambers are respectively provided with valves suitable for connecting to a pump, or to a person's mouth, for inflating the air chambers. As can be seen from Figure 10, not all the chambers will be accessible to the exterior of the apparatus 200, and therefore will have apertures which communicate with air chambers accessible from the outside of the apparatus by means of a suitable valve.

Further preferred embodiments will now be described with reference to Figures 11 and 12 of the drawings, in which Figure 11 shows training/practice apparatus 500 having a front wall 102 with apertures 504 formed therein. The apertures may be formed so as to releasably retain a ball kicked or thrown into them, or may permit a ball or other projectile to pass through them. Apparatus 500, also comprises inflatable pockets such as were described with reference to Figures 7 through 10 above. Front wall, 102, may also comprise inflatable pockets in order to provide it with a suitable thickness and flexibility by which balls directed at apertures 504 may be lodged within them. Planar stiffening members may then be incorporated within the front of the wall 102 in a manner similar to that as described above, in order to provide a rebound surface in between the apertures 504.

Turning now to Figure 12, sports training/practice apparatus 600 is shown having suitable targets such as an archery target and/or a cricket wicket applied to the graphic sheet 122, and in this instance to respective target areas being formed on respective sides of the apparatus. The target areas may have retention means suitable for releasably retaining projectiles directed and impinging upon them. For example the cricket wicket may comprise miniature hooked elements, for retaining a ball or such like coated with fibrous elements, such as may be found with Velcro (TM) fasteners. An arrow or other such projectile may be retained by means of a suitable array of small apertures, or by means of a sucker applied to the tip of the arrow.

In accordance with another aspect of the invention, sports/practice apparatus 700 is configured as a freestanding goal such as may be suitable for football or hockey. The framework of the goals such as the uprights 702, cross bar 704 and angled bracing struts 706 comprise a series of inflatable chambers. The side walls 708 may also comprise inflatable chambers, or may be single sheets of plastics material. The framework of the goal and side walls, is attached to the base 110 which may be fixed to the ground by means of the eyelets 112 and suitable stakes. Generally, the upright 702, cross bar 704 and angled bracing struts 706 comprise a series of inflatable chambers which may be independently inflated or deflated, or may have communicating apertures by which the air may be distributed throughout all the chambers.

A yet further preferred embodiment in accordance with the invention will now be described with reference to the sports training/practice apparatus 800 shown in Figure 14. Wall 102 has attached to its back surface a series of inflatable tubes 802, of which a first portion 804 are attached to the back of the wall 102 and have substantially semi circular cross-sections. The second part forms angled bracing struts 806 and may be of any suitable cross-section such as a circular cross-section. The series of inflatable tubes 802 have small gaps between them, or groups of them, into which may be inserted stiffeners 808 of any suitable material such as rigid plastics, metal, timber or composite material. The stiffeners 808 may be retained between the tubes 802 by means of a simple lacing arrangement utilising the eyelet 810 provided on the stiffeners 808, and corresponding eyelets provided on the tubes 802. Any other suitable fixing means may be utilised, such as friction.

Optionally, the first part of tubes 802, i.e. 804, need not be utilised and the wall 102 can have a substantially planar rear surface. Such a configuration is shown with regard to apparatus 900 shown in Figure 15. Sports training/practice apparatus 900 is provided with merely angled inflatable sections 902. The rear section of apparatus 900 may be housed within a sheet 904, which may form a rear part to inflatable semi circular tubes 902.

In accordance with preferred embodiments of the invention, pockets are provided for receiving linear stiffening members as will now be described with reference to Figures 16 and 17. Figures 16 and 17 show apparatus configured as apparatus 100 and 500 respectively described with reference to Figures 7 and 8, and Figure 11 above. However, the foregoing description is not limited to apparatus configured as shown in Figures 16 and 17.

Figure 16 shows pockets which are suitable for receiving stiffening rods. The pockets 1002, may be placed along the long edges of the apparatus and across the front wall 102. The pockets 1002 are placed behind the front surface of the front wall 102 in order that any rods placed in them will not interfere with the substantially planar front surface provided by wall 102.

Referring now to Figure 17, the pockets 1002 provided along the front wall 102 are typically formed towards the rear of the intermediate sheet 126. This would provide for the insertion of a planar stiffener or stiffeners 124 between the intermediate sheet 126 and the front graphics' sheet 122. The stiffening rods 1004 may be made of any suitable rigid material such as plastics, metal, timber or a composite material and may be either solid or tubular in construction. Although not shown in Figure 17, the sports practice/training apparatus may still comprise inflatable pockets of any of the suitable configurations described herein such that the apparatus may be partly inflated, or indeed even fully inflated, before insertion of the stiffening rods 1004 in order that placing the rods in the pockets is facilitated.

In a still yet further embodiment in accordance with the invention, Figure 18 shows sports training/practice apparatus 1200 in which a combination of air chambers and planar and rod stiffeners provide a wall having suitable rigidity for ball skills or the like training. In the embodiment of apparatus 1200, a substantially rectangular configuration is utilised. The front wall 102 comprises the graphic sheet 122 and planar member or members 124 attached to an intermediate wall 126. 126 has attached to it, and running in a horizontal direction a series of substantially semi circular cylinders. The longitudinal edges of the cylinders are provided with pockets 1002 for receiving stiffening rods 1004. There is also provided a rear wall 136 which also has semi circular inflatable cylinders attached to it. The rear wall 136 is attached to the intermediate wall 126 by means of a top section 106 and side walls 134. The regions outside of the semi circular cylinders 1202, shown 1204, may also be inflatable. The intermediate wall 126, rear wall 136, top wall 106 and side walls 134 are attached to each other by means of suitable seams such as by high frequency welding, thermo-bonding or gluing to form an impermeable seal where necessary. Additionally, apparatus 1200 comprises a base 110 which is fixed to the apparatus by means of impermeable seals where the base forms a wall of an inflatable chamber.

A still yet further embodiment in accordance with the invention as described with reference to Figure 19, wherein sports practice/training apparatus 1300 is shown to have stiffening rods 1004 placed in pockets 1002 distributed along the side and top edge of the front of wall 102. That is to say the graphics sheet 122 comprises pockets 1002 for receiving the stiffening rods 1004. Additionally, stiffening rods are provided as angled bracing struts as shown by reference 1304. Further, stiffening rods are also disposed in pockets along the rear base edge of apparatus 1300. Although not shown in Figure 19, apparatus 1300 may also comprise inflatable chambers.

A yet further preferred embodiment in accordance with the invention having air chambers 206 formed by rectangular ribs 210, is shown in Figure 20.

In view of the foregoing description it will be evident to a person skilled in the art that various modifications may be made within the scope of the invention. For example, the inflatable chambers need not be inflatable by air, but may be inflatable by any suitable fluid such as another gas or indeed a suitable liquid such as water.

To illustrate the versatility and strength of the inflatable structure illustrated in Figs. 1 to 4, a further inflatable structure is illustrated in Figs. 21 and 22 in the form of an inflatable chair 60. The chair is defined by an upper web 62 and a lower web 64, between which are arranged a plurality of inflatable cells 66. The webs and cells have a similar construction to that described in detail for the embodiment of Figs. 1 to 4, and so such detail is not described in detail here. Although not illustrated in Fig. 21 and 22. the chair 60 can also receive weights or weight containers in the spaces 68 between adjacent cells, to weight the base of the chair.

A difference in the embodiment of Figs. 21 and 22 resides in the curved shape of the structure. This is achieved by selecting the distances U between adjacent welds to the upper web 62, the distances 1₂ between the welds to the lower web, and the height h of each web. In particular, by making the distances U less than the distances 1₂, the structure can be made to curve upwardly (or vice versa). The structure is self-shaping when inflated, and the strength of the structure depends to a large extent on the inflation pressure of the cells, and whether the cells are able to "lose" pressure through communication with other cells. In the illustrated embodiment, optimum strength is achieved if the cells are isolated form each other, although as a compromise the cells might be inflatable in groups, or by a single inlet valve. A small cell size also provides a greater degree of rigidity than a large cell size, for the same inflation pressure.

As best seen in Fig. 21, the seat 60 also tapers in width from the front 70 to the rear seat back 72, to define a more ergonomic seat profile than is achievable using standard prior art techniques.

The scope of the present disclosure includes any novel feature or combination of features disclosed therein either explicitly or implicitly or any generalisation thereof irrespective of whether or not it relates to the claimed invention or mitigates any or all of the problems addressed by the present invention. The application hereby gives notice that new Claims may be formulated to such features during the prosecution of this application or of any such further application derived therefrom. In particular, with reference to the appended Claims, features from dependent Claims may be combined with those of the independent Claims in any appropriate manner and not merely in the specific combinations enumerated in the Claims.

Claims

1. Sports apparatus comprising an inflatable support structure bearing a rebound sheet.

2. Apparatus according to claim 1, wherein the rebound sheet is flexible and/or foldable, and the inflatable structure, in use, holds the rebound sheet in a generally rigid configuration.

3. Apparatus according to claim 1 or 2, wherein the rebound sheet comprises one or more relatively stiff panels.

4. Apparatus according to claim 1, 2 or 3, wherein the inflatable structure comprises first and second webs between which are located first and second cells distinct from the webs, the cells, when inflated, applying pressure directly or indirectly on each other to urge each other apart and thereby support the rebound sheet.

5. Apparatus according to claim 4, wherein the rebound sheet forms or comprises one of the webs of the inflatable structure.

6. Apparatus including an inflatable structure comprising first and second webs between which are located first and second cells distinct from the webs, the cells, when inflated, applying pressure directly or indirectly on each other to urge each other apart and thereby support the webs.

7. Apparatus according to claim 4, 5 or 6, wherein the cells are formed as cells in a continuous strip.

8. Apparatus according to claim 4, 5, 6 or 7, wherein the cells are inclined relative to each other to form a "V" shape.

9. Apparatus according to any of claims 4 to 8, comprising a plurality of cells extending back and forth between the webs.

10. Apparatus according to any of claims 4 to 9, comprising a plurality of cells defining a zigzag configuration between the webs.

11. Apparatus according to any of claims 4 to 10, wherein the first and second cells communicate with each other.

12. Apparatus according to any of claims 4 to 10, wherein the first and second cells are isolated from each other.

13. Apparatus according to any of claims 4 to 12, wherein each cell has an envelope configuration.

14. Apparatus according to claim 13, wherein the cells are formed from first and second sheets welded together at intervals to define boundaries between adjacent cells, and welded together along at least one peripheral edge.

15. Apparatus according to any of claims 4 to 14, wherein the inflatable structure defines a generally linear shape.

16. Apparatus according to any of claims 4 to 14, wherein the inflatable structure defines a curved or angled shape.

17. Apparatus according to any of claims 4 to 16, wherein the cells are attached to at least one of the webs.

18. Apparatus according to claim 17, wherein the cells are attached to both of the webs.

19. Apparatus according to claim 17 or 18, wherein the cells are attached by welding.

20. Apparatus according to any preceding claim, further comprising at least one weight or weight container receivable in a space within the inflatable structure, for weighing down the structure.

21. Apparatus according to any of claims 1 to 19, further comprising a weight or weight container receivable in a space between the webs and between the first and second cells, for weighing down the structure.

22. Apparatus including an inflatable structure comprising first and second inflatable cells, and a weight or weight container receivable in a space between the first and second cells for weighing down the structure.

23. Apparatus according to claim 21 or 22, wherein the container is in the form of a tube.

24. Apparatus according to claim 21, 22 or 23, wherein the container comprises a releasably closable opening.

25. Apparatus according to claim 21, 22, 23 or 24, wherein the weight or weight container is retainable in position between the cells by inflation of the cells to bear against the container.

26. Apparatus according to any of claims 21 to 25, comprising a plurality of weights and/or weight containers receivable in a respective plurality of spaces between cells of the inflatable structure.

27. Apparatus according to any preceding claim, comprising or further comprising a cover arrangeable around the inflatable structure.

28. Apparatus according to claim 27, wherein the cover is in the form of a sleeve.

29. Apparatus according to claim 27 or 28, wherein the cover is retainable in position by inflation of the structure.

30. Apparatus according to claim 27, 28 or 29, wherein the cover bears a graphics image.

31. Apparatus according to claim 27, 28, 29 or 30, wherein the cover is interchangeable.

32. Apparatus for sports practice comprising a frame for defining a target area toward which a user can direct a projectile, wherein the frame comprises a pliable material and is supportable by means of distendible members for providing a substantially rigid support for the frame.

33. Apparatus according to Claim 32, wherein the frame comprises said distendible members.

34. Apparatus according to Claim 32 or Claim 33, wherein the distendible members are chambers integral with the frame.

35. Apparatus according to Claim 33 or Claim 34, wherein the distendible members/chambers are distendible by introducing a fluid under pressure.

36. Apparatus according to Claim 33 or Claim 34, wherein the distendible members/chambers are inflatable by introducing a gas under pressure.

37 Apparatus according to any of claims 31 to 36, further comprising a first means for receiving a first stiffener for enhancing the rigidity of the frame.

38. Apparatus according to any of claims 31 to 37, further comprising a surface for defining the target area.

39. Apparatus according to Claim 38 comprising second receiving means for a second stiffener for enhancing the rigidity of said surface.

40. Apparatus according to Claim 39. wherein the further receiving means are suitable for receiving a substantially planar stiffener.

41. Apparatus according to any of Claims 38 to 40, wherein the surface comprises projectile retaining means.

42. Apparatus according to Claim 41 wherein the projectile retaining means comprises velcro (TM) or adhesive.

43. Apparatus according to any one of Claims 38 to 40 wherein the surface comprises apertures towards which projectiles may be aimed.

44. Apparatus according to Claim 43, wherein said apertures are adapted to allow a projectile to pass through them or to cause a projectile to be lodged in the aperture.

45. Apparatus according to any of Claims 38 to 43, wherein the surface is provided with sufficient rigidity to cause a projectile impinging thereon to rebound therefrom.

46. Apparatus according to any of claims 31 to 45, comprising more than one frame or surface defining a target area for facilitating concurrent use of the apparatus by more than one user.

47. Apparatus according to any of claims 31 to 46 wherein the frame or surface is suitable for carrying graphic images.

48. Apparatus according to any of claims 31 to 47, wherein in use the apparatus comprises a stiffener of rigid material.

49. Apparatus according to Claim 47 wherein the stiffener and/or further stiffeners comprise wood and/or plastics and/or metal and/or a composite material.

50. Apparatus according to Claim 47 or Claim 48, wherein the apparatus comprises a second stiffener of substantially planar configuration for providing the surface with a rigidity suitable to cause a projectile to rebound therefrom.

51. Apparatus according to any of claims 31 to 50, collapsible for storage and/or transportation.