Disclosed is system and method for measuring the tension of a tennis net, and, alternatively or in addition, for determining if a service let occurs via the measuring of the net tension. The disclosed embodiments measure a force exerted on the center-strap or the singles stick by the net. In these embodiments, the measured force provides an accurate reflection of the tension of the net.

Disclosed is system and method for measuring the tension of a tennis net, and, alternatively or in addition, for determining if a service let occurs via the measuring of the net tension. The disclosed embodiments measure a force exerted on the center-strap or the singles stick by the net. In these embodiments, the measured force provides an accurate reflection of the tension of the net.

Disclosed is system and method for measuring the tension of a tennis net, and, alternatively or in addition, for determining if a service let occurs via the measuring of the net tension. The disclosed embodiments measure a force exerted on the center-strap or the singles stick by the net. In these embodiments, the measured force provides an accurate reflection of the tension of the net.

Disclosed is system and method for measuring the tension of a tennis net, and, alternatively or in addition, for determining if a service let occurs via the measuring of the net tension. The disclosed embodiments measure a force exerted on the center-strap or the singles stick by the net. In these embodiments, the measured force provides an accurate reflection of the tension of the net.

An easily assembled and disassembled frame for a net game includes a rigid multi-part frame with a cross-member that is non-sagging. Sections of the multi-part frame have an elliptical profile. A net stabilizer includes a tensioning member coupled at one end to a retention member of the frame, and having the other end of the tensioning member inserted into a center sleeve of the net, and, a center sleeve with a securing member for fastening securely at one end to the cross-member.

An easily assembled and disassembled frame for a net game includes a rigid multi-part frame with a cross-member that is non-sagging. Sections of the multi-part frame have an elliptical profile. A net stabilizer includes a tensioning member coupled at one end to a retention member of the frame, and having the other end of the tensioning member inserted into a center sleeve of the net, and, a center sleeve with a securing member for fastening securely at one end to the cross-member.

A clamping device for holding an object in place comprising a female plate 10 with an exterior 11 and interior 12 surface and a bottom edge 15 with a plurality protrusions 16 wherein each of the protrusions has a opening 17 therein; a male plate 1 with an exterior 2 and interior 3 surface and a bottom edge 9 with a plurality of teeth 7; and at least two stepper keys 21 on said exterior 2 surface of the male plate 1; wherein the male teeth 7 fit snuggly within the female plate protrusion openings 17 such that the object placed between the male plate 1 and the female plate 10 is held in place by locking the stepper keys 21 in place.

A volleyball training device has a training state and a using state, including a base, a volleyball net component, and an interception net component. The volleyball net component and the interception net component are detachably connected to the base. In the using state, the volleyball net component is connected to the base, and the interception net component is detached from the base. In the training state, the volleyball net component is connected to the base, and the interception net component is connected to the base. Through the structure above, when in the training state, the interception net component can intercept the volleyball that passes an upper end of the volleyball net component, facilitating a user's practice of volleyball actions such as serving and spiking. When in the using state, only the volleyball net component is connected to the base, and the user can normally hit the volleyball.

A volleyball training device has a training state and a using state, including a base, a volleyball net component, and an interception net component. The volleyball net component and the interception net component are detachably connected to the base. In the using state, the volleyball net component is connected to the base, and the interception net component is detached from the base. In the training state, the volleyball net component is connected to the base, and the interception net component is connected to the base. Through the structure above, when in the training state, the interception net component can intercept the volleyball that passes an upper end of the volleyball net component, facilitating a user's practice of volleyball actions such as serving and spiking. When in the using state, only the volleyball net component is connected to the base, and the user can normally hit the volleyball.

An easily assembled and disassembled frame for a net game includes a rigid multi-part frame with a cross-member that is non-sagging. Sections of the multi-part frame have an elliptical profile. A net stabilizer includes a tensioning member coupled at one end to a retention member of the frame, and having the other end of the tensioning member inserted into a center sleeve of the net, and, a center sleeve with a securing member for fastening securely at one end to the cross-member.