The invention refers to the equipment of floorball rink, mainly to the arrangement of rink boards, manufacturing of its structural elements applying concept of tennis racket stringing.

16 information sources was found in the international database http://worldwide, espacenet. com, with "floorball" keyword. Among them, there was only one patent application WO03086556 (A1) "Dismountable/collapsible board design", applied on 23.10.2003, referring arrangement of the floorball rink boarding, but others were related to the design of sticks used in the game. The mentioned floorball rink boarding design is formed of plate elements, which during boarding are connected edge to edge one after another and on disassembling are successively detached one from another. The design of mentioned elements is demonstrated in details in 15 figures. Substantial disadvantage of such elements is high consumption of materials and structural complexity as well as inconformity with functional features of floorball training process, particularly for the reason that this solution allows to practice ball shots only at inner side of the rink perimeter boarding.

Different modes of concept of tennis racket stringing are described in details in the webpage http://www.faxs.org/sports-science/Sp-Tw/tennis-racquet-Cons tructions and http://en.wikipedia.org/wiki/racket (sports equipment)# Rackets). Choice of particular stringing method is question of each interested knowledge and experience, at that alternatives are very wide, starting from rocket body materials, string materials, stringing patterns and methods of string fixing to the rocket body.

The invention aim is to use principle of tennis racket stringing for making subsidiary structural element of floorball training rink, with substantially reduced material use and therefore reducing elements weight, as well as facilitating elements joining between their ends and one over another, optionally inclined about the rink floor in arbitrary zones of the rink, where players can hone their skill, at that inside the rink, so using both sides of element comparing with only inner side in case of known perimeter boarding. Substance of the invention concerning subsidiary element design is defined in the claims 1 to 6 and concerning mode of the element use defined in claims 7 to 9. One of the possible alternatives of the invention implementation is illustrated in Fig. 1. and Fig. 2., at that:

- Fig.1 presents general view of rink arrangement with assembled subsidiary elements of proposed design, where: 1.1 is element's A-side top / bottom view; 1.2 is element's B-side front / back view; 1.3 is element's C-side right / left end view; 1.4 is element's D-side right / left ends view from inside;

- Fig. 2 shows general view of rink arrangement with subsidiary elements of proposed design in assembling process, with that the structure parts of element are additionally depicted, where: 2.1 is element's A-side top / bottom view; 2.2 is element's B-side front / back view; 2.3 is element's C-side, right / left end view; 2.4 is element's D-side right / left ends view from inside; - Fig. 3 presents axonometric perspective of general view of rink arrangement with assembled subsidiary elements of proposed design.

The following drawing indications of parts were used for defining proposed subsidiary element design:

1 - string (2 pcs.),

2 - aluminium string terminal (4 pcs.),

3 - string fixing screw (2 pcs.),

4 - aluminium tubes, covering threaded rods (4 pcs.),

5 - threaded rod (4 pcs.),

6 - lock nut, washer, decorative nut cap (4 sets),

7 - end plate, fore example of PVC, (2 pcs.),

8 - marking plate / brand label. Detailed description of the proposed training rink arrangement

(a) Strings assure strong dap of the ball directed against subsidiary element side surface with string pattern. Linear reversed string distribution by the element length on the both sides of subsidiary element make possible for two players to practice game skill if the element is placed in the middle of the rink. String ends' eyes enforced with aluminium terminals. All string sections are parallel and recommended distance between them is 1 cm. The distance can be increased or reduced depending on the various circumstances. Recommended length of the strings between end plates is 75 cm, but it can be longer or shorter than recommended. The distance of the bottom string from the rink surface is 2 cm, but it can be bigger or smaller than recommended. Recommended number of strings' section is 9 and all they are parallel. At that the number of sections can be greater or fewer. Strings of 1 to 1.4 mm diameter can be as synthetic as well as natural, made of steel or polymer or textile cords. String diameter can be bigger or smaller than recommended. String ends' eyes are fixed to the end plates internal surface with a screws on both element ends.

(b) Aluminium terminals reinforce string ends' eyes. Recommended terminal dimension is 1 to 1.4 mm, but according to particular needs can be bigger or smaller relative to the recommended.

(c) String ends' eyes are fixed to internal surface of the end plates with screws.

(d) Aluminium tubes and their arrangement oppose the load of stringing. Recommended length of tubes is 75 mm and the recommended number of tubes in the element is 4 with distance between them 9 cm, and tube diameter 14 mm. Mentioned tubes' parameters: diameter, length, number and arrangement pitch can be greater or smaller than recommended. The distance between tubes is measured between tubes' axes.

(e) Threaded roads and their arrangement assure resistance of the proposed subsidiary element against load generated by stringing as well as by floorball balls strikes. Threaded roads rigidly fix both string keeping end plates at the ends of subsidiary element. Threaded rod recommended length and number are correspondingly 81 cm and 4 pieces. The rod can be longer or shorter, than recommended. The number of roads can also vary to suite particular need. Recommended diameter of the threaded rod 12 mm, but it also can be bigger o smaller than recommended. Recommended distance between threaded rods equal to 9 cm, measured between rods' axes. Mentioned distance can also be modified as necessary.

(f) Lock nuts fix the threaded rods, optionally covered with aluminium tubes, at the end plates and their number correspond the number of threaded rods used in the design. (g) Washers being assembly components placed between the nut and end plate on the both plate sides. Eventual decorative caps on the lock nuts used to mask the nuts.

(i) Recommended dimensions of the plastic end plates forming subsidiary element ends and providing support surface for the strings are 12 cm x 20 cm x 2 cm. The plate can be made of PVC or other polymer, as well as of wood or metal. The plate dimensions can be bigger or smaller than recommended. There is 4 holes of 1.3 cm diameter disposed at regular intervals between them and aimed for threaded rods fixing with lock nuts and washers. There is 4 mm deep socket on one side of the plate aimed for string screw. Each end plate has 10 small holes aimed for string running through. Recommended distance between holes 1 cm and the number of holes as necessary can be larger or smaller than recommended. Recommended distance between holes is 1 cm, but other distance can be applied depending of the plate and string materials and their characteristics.