Ball rebound device
A ball rebound device for ball games comprising: a frame structure, a sheet being detachably attached to the front of the frame structure and adjusting means connected to the frame structure, the adjusting means being able to move part of the frame structure, whereby the tension of the sheet can increase or decrease. By stretching the sheet, it is possible to increase the rebound force of the sheet by ball impact. Similarly, the rebound force can be decreased when the sheet is slackened.
1. A ball rebound device for ball games comprising:
a rectangular frame structure comprising two vertical frame elements and two horizontal frame elements joined together to form the rectangular frame structure, wherein forward-facing surfaces of the two vertical frame elements and two horizontal frame elements define a front-side plane of the rectangular frame structure;
a first fillet abutting at least one of the two vertical frame elements on the forward-facing surfaces defining the front-side plane of the rectangular frame structure;
a second fillet abutting at least one of the two horizontal frame elements on the forward-facing surfaces defining the front-side plane of the rectangular frame structure;
a sheet detachably attached to the first and second fillets abutting the front-side plane of the rectangular frame structure by attaching elements; and
wherein the first and second fillets adjustably abut the front-side plane of the rectangular frame structure such that the tension of the sheet is configured to be increased or decreased.
2. The ball rebound device according to claim 1 wherein the rectangular frame structure on the front-side plane comprises attaching elements for attaching the sheet to the rectangular frame structure.
3. The ball rebound device according to claim 2 , wherein the attaching elements have the form of knobs, pulleys, hooks or the like.
4. The ball rebound device according to claim 1 , wherein the first and second fillets adjustably abut the front-side plane of the rectangular frame structure by means of a screw principle.
5. The ball rebound device according to claim 1 , wherein the sheet is a net or a net-like structure.
6. The ball rebound device according to claim 5 , wherein the net or the net-like structure is connected to the attaching elements at the end meshes or edge loops of the net.
7. The ball rebound device according to claim 1 , wherein an adjustable supporting structure for enabling the frame structure to stand on the ground is attached to the frame structure.
8. The ball rebound device according to claim 7 , wherein wheels are arranged in connection with the adjustable support structure.
9. A method for assembling a ball rebound device according to claim 1 , the method comprising the step of:
assembling a rectangular frame structure comprising two vertical frame elements and two horizontal frame elements joined together to form the rectangular frame structure, wherein forward-facing surfaces of the two vertical frame elements and two horizontal frame elements define a front-side plane of the rectangular frame structure;
abutting a first fillet on at least one of the two vertical frame elements on the forward-facing surfaces defining the front-side plane of the rectangular frame structure;
abutting a second fillet on at least one of the two horizontal frame elements on the forward-facing surfaces defining the front-side plane of the rectangular frame structure;
attaching a sheet to the first and second fillets abutting the front-side plane of the rectangular frame structure using attaching elements; and
wherein the first and second fillets adjustably abut the front-side plane of the rectangular frame structure, such that the tension of the sheet is configured to be increased or decreased.
10. The method according to claim 9 , wherein the method furthermore comprises the step of attaching adjustable supporting structure to the frame structure to enable the frame structure to stand on the ground.
11. The method according to claim 9 , wherein the sheet comprises edge masks held in place by fixing means, preferably hook- and loop-fasteners.