Patent Grant
RE49995
The invention relates to a trampoline with a base, which includes a frame, and with a jumping sheet, which preferably includes hook elements on its underside, the jumping sheet being connected to the frame by means of a plurality of annular strap sections, which each extend at least partially around the frame and are secured to the hook elements. The invention is also directed to a hook element for trampolines.
Trampolines are widely used in physiotherapy and in the leisure area.
In the case of so-called mini-trampolines, a distinction is made between trampolines with a spring suspension and a rubber strap ring suspension. In the case of a spring suspension, the jumping sheet is secured to the frame by means of spiral springs. Such a suspension makes considerable acceleration forces available and is thus suitable, in particular, for sports training with high demands on the cardiovascular system.
In the case of a rubber strap ring suspension, one or more elastic straps or strap sections are used, which connect the jumping sheet to the frame. The larger elasticity of such a fastening produces “softer” deceleration of the body and is thus primarily suitable in the case of joint and back problems, in rehabilitation, for relaxation and combating stress and for children.
Only a single elastic strap was originally provided in strap suspensions, see for example DE 299 19912 U1. The strap is wound alternately about the frame of the trampoline and pulled through loops arranged on the underside of the jumping sheet. It has, however, transpired in practice that the known trampoline has disadvantages in operation. Thus the fastening of the jumping sheet to the frame is perceived to be complex. Furthermore, tilting of the jumping sheet with respect to the frame can occur in use. In particular, however, the entire strap must be replaced if only one point on the strap is abraded or worn.
There has therefore been a move to suspending the jumping sheet on a plurality of annular strap sections, which are preferably fastened to the underside of the jumping sheet and are looped around the frame. Such a trampoline is disclosed in, for instance, DE 102 26707 B4 emanating from the applicant. By contrast with the suspension of the jumping sheet with only a single strap, the individual strap suspension combines a number of advantages. Above all, the durability is significantly increased. Furthermore, replaceability is also better (and cheaper). If a strap section is worn, it is simply replaced individually. The other strap sections remain untouched. Finally, the individual strap suspension always ensures correct centering of the jumping sheet.
The individual strap suspension has basically proved to be satisfactory. There is, however, the endeavour to improve the known trampoline. This applies, in particular, with regard to the wear resistance of the suspension.
Starting from the known prior art, it is the object of the invention to improve the durability of the known trampoline whilst maintaining the good handling.
In order to solve this object, the trampoline referred to above is characterised in accordance with the invention that the hook elements have a first receiving section and a second receiving section, which are arranged separated from one another such that the two loop ends of the strap section, which are formed by the looping of a strap section around the frame and are inserted into the hook element, do not, or substantially not, contact one another.
The invention is based on the recognition that relative movement occurs between the hook elements and the strap sections or between the loop ends relative to one another, which can result in premature destruction of the strap ring. Particularly in the case of strap rings with a sheath of e.g. a textile or plastic braid, as are commonly nowadays used, there is the risk of damage by rubbing. In accordance with the invention, in order to prevent this relative movement, two separate receiving sections are provided on the hook element, which receive a respective loop end and ensure that the loop ends to not contact one another. The increase in the service life is considerable.
Reference is made at this point to the fact that in the loading and/or unloading phase, it can occur that the loop ends contact one another slightly but this contact is negligible. This case is intended to be embraced by the invention.
The first receiving section and the second receiving section (in the main tension direction of the strap section in question) are preferably arranged substantially at the same height. Such a construction ensures that the two loop ends are stretched to the same extent in the event of tensional loading of the strap section so that the strap ring thus experiences no relative movement between its loop ends. An arrangement of the receiving sections at substantially the same height further has the advantage that any relative movements between the frame and the strap section can be kept minimal.
A further advantageous feature for minimising wear and thus increasing the service life is characterised in that the cross-section in the region of the receiving sections is of part-circular rounded shape and preferably has an angle of at least 160°, particularly ca. 180°. Curved cross-sections are already known in the prior art; a part-circular section which terminates gently in the transition region, for instance tangentially to the loop ends, significantly reduces the wear with respect to known solutions.
In an important embodiment of the invention, it is proposed that the first receiving section and the second receiving section are separated by a connecting web for connecting the hook element to the jumping sheet. The connecting web fulfils two functions, namely on the one hand the connection of the hook to the jumping sheet and on the other hand the separation of the first receiving section from the second receiving section. The connecting web preferably divides the connecting web symmetrically.
The connecting web can be connected to the jumping sheet in numerous ways. With conventional trampolines, the use of rivets has proved to be satisfactory. The invention is, however, based on the further recognition that it can be advantageous if the hook is not rigidly fixed to the jumping sheet but can alter its angle within predetermined limits with respect to the jumping sheet. In use of the trampoline, the hook element is thus always situated at a favourable angle, at which friction can be kept minimal. In this connection, it has proved to be particularly advantageous if the connecting web has a connecting opening at its rear end, by means of which the hook is connectable to the jumping sheet. The opening is advantageously closed and a flexible loop extending from the jumping sheet engages through the opening.
The opening is generally arranged horizontally and preferably substantially in the plane of the jumping sheet. The hook element is thus advantageously pivotable upwardly and/or downwardly and therefore conveniently always aligned in the tensional direction of the respective loop section. An arrangement in which, in the inserted state of the strap section, one loop end is arranged above the connecting web and one loop end is arranged below the connecting web is considered to be structurally particularly favourable.
In addition to the required wear resistance of the hook elements, there is a significant further requirement in the reliability of the suspension in use of trampolines. In this connection, it can advantageously be provided that the hook element has two side walls, which prevent sliding or release of the strap section out of the hook element. The side walls preferably project substantially perpendicularly from the respective receiving section. Such a construction offers high reliability in conjunction with good handling of the trampoline. In particular, the loop ends are easily insertable into the respective receiving section.
The side walls advantageously broaden towards their free ends. Even in the event of rapid bouncing back after loading of the jumping sheet into the starting position, each strap section sits reliably in its associated hook element. Insertion of the strap section into the hook element is effected with the jumping sheet unloaded and is completely unproblematic, notwithstanding the broadened end.
Additionally or alternatively, the connecting web can also broaden towards its end connected to the jumping sheet. It offers the best connecting possibilities to the jumping sheet at its broad end and increased strength during use of the trampoline. The receiving sections, on the other hand, can be chosen to be narrower and preferably have, as previously described, a part circular rounded cross-section.
The hook element is preferably manufactured from plastic material. The hook element is preferably manufactured as an injection moulded component.
The object of the invention is further solved by a hook element for trampolines with a first receiving section for receiving a first loop end of a strap section and with a second receiving section for receiving a second loop end of the strap section, wherein the first and second receiving sections are arranged separated from one another such that the loop ends of the strap section inserted into the hook element in particular do not, or substantially not, contact one another. The receiving sections are advantageously arranged at substantially the same height.
Further advantageous embodiments of the hook element in accordance with the invention are to be found in the dependant claims. Significant advantages of the hook element have also been indicated in conjunction with the description of the trampoline in accordance with the invention.
The invention will be explained below in more detail by way of a preferred exemplary embodiment in conjunction with the attached drawings, in which:
Fastened to the underside of the jumping sheet (2) are hook elements (4), whereby loops (5) are sewn to the jumping sheet, which is each pass through an opening (6) in the hook element. The hook element (4) is thus movably and, in particular, pivotably connected to the jumping sheet (2). Alternatively, the hook elements (4) can also be fastened externally to the jumping sheet (2). However, they are then not protected from above by the jumping sheet (4) or a cover associated with the jumping sheet so that fastening to the underside is thus preferred.
The strap sections (3) are looped around the frame (1) of the trampoline such that in each case one loop end (7, 8) is inserted into the hook element (4). In the illustrated exemplary embodiment, the loop end (7) is arranged above the loop end (8). It is basically provided in accordance with the invention that the loop end (7, 8) do not contact one another.
Reference is made to
Arranged on each side is a side wall (12, 13), which projects perpendicularly from the associated receiving section (9, 10) and ensures that an inserted strap remains securely in the receiving sections, even when the trampoline is being used.
As may be seen, in particular, in
| Number | Date | Country | Kind |
|---|---|---|---|
| 102006028363 | Jun 2006 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2007/005317 | 6/16/2007 | WO | 12/17/2008 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2007/147534 | 12/27/2007 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 2991841 | Sampson et al. | Jul 1961 | A |
| 20090206621 | Payne | Aug 2009 | A1 |
| Number | Date | Country |
|---|---|---|
| 2504875 | Aug 1976 | DE |
| 8805500 | Jul 1988 | DE |
| 29919912 | Jan 2000 | DE |
| 299 19 912 | Feb 2000 | DE |
| 10226707 | Jan 2004 | DE |
| 0791375 | Aug 1997 | EP |
| 2035096 | Mar 2013 | EP |
| 2541099 | Feb 1984 | FR |
| 2541099 | Aug 1984 | FR |
| 2123280 | Feb 1984 | GB |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12305327 | Jun 2007 | US |
| Child | 17513364 | US |
