According to one aspect of the invention, there is provided a method for measuring ball spin, the method comprising the steps of: detecting information on a mark appearing in a region corresponding to a ball hit by a user in each of a plurality of images in which the ball is photographed; determining whether it is possible to directly calculate physical quantities related to spin of the ball on the basis of the information on the mark; and when it is determined that it is not possible to directly calculate the physical quantities related to spin of the ball on the basis of the information on the mark, estimating the physical quantities related to spin of the ball on the basis of physical quantities related to at least one of a speed and an angle of the ball or a club hitting the ball.

The present invention relates to a tennis wall (100), comprising a frame that can be erected on the ground (101) and a cloth (102) stretched in said frame (101), wherein the cloth (102) is stretched such that a level cloth surface (104) is formed and that a tennis ball hitting the cloth surface (104) rolls or slides up the cloth surface (104) and then rolls or slides down again, characterized in that a recess (105) is provided on the upper end (103) of the cloth (102), the recess (105) being designed and positioned such that a tennis ball, once it has rolled or slid up the cloth surface (104), then enters the recess (105), subsequently rolls or slides out of the recess (105) again and only then rolls or slides down the cloth surface (104). The invention also relates to the use of this tennis wall as an aid in tennis training.

A soccer training device and system includes a generally horizontal and planar platform and at least one sloped soccer ball collection trough provided generally around a perimeter of the platform. A segmented cage is provided generally at and around outer bounds of, and vertically above, the platform. At least one sensored gate includes at least one soccer ball impact curtain provided above the at least one soccer ball collection trough to direct soccer balls into the trough, and at least one arrangement of sensors to sense presence of the soccer balls that are impacting the at least one curtain. A ball thrower sequentially receives the soccer balls from the silo, to sequentially deliver the soccer balls to a player on the platform. A control panel and a control box control operation of the soccer training device and system.

A cable tension overload fuse assembly is configured to couple together a structural support cable operatively coupled to a structural support, and a net barrier cable supporting barrier netting. The cable tension overload fuse assembly includes a mechanical fuse and a rescue cable coupled to the structural support cable and the net barrier cable. The mechanical fuse is configured to break upon exertion of a predetermined force to allow the net barrier cable to sag to reduce forces transmitted to the structural support and prevent damage to it, while the rescue cable continues to couple together the structural support cable and the net barrier cable to prevent the net barrier and/or net barrier or net barrier cable from falling completely to the ground without the structural support cable and cable tension overload fuse assembly.

Herein disclosed is a mobile golf simulation system, more particularly, a double-bayed golf simulator apparatus mounted to a wheeled trailer that may be readily transported and deployed to remote, particularly outdoor locations. The mobile golf simulation system of the present invention is uniquely designed to include a projection system installed beneath a floating floor that, along with right and left drop-down walls, allows for the creation of an open air platform from which a user may play a realistic form of virtual golf, hitting his ball into a built-in screen.

A foldable basketball stand has at least one hoop on a rear surface of a backboard on an upper half of an upper portion of a front frame. A middle portion of left/right front rod of the front frame has a first and a second left/right joints respectively. Rear/front ends of a left-top rod and a left-bottom rod of a left frame are connected to a left-middle rod/the left-front rod respectively. Rear/front ends of a right-top rod and a right-bottom rod of a right frame are connected to a right-middle rod/the right-front rod respectively. Two ends of left/right supporting rod are connected to a middle portion of the left/right top rod and the left/right front rod respectively. An upper portion of a rear frame has a stop portion. Left/right sides of the rear frame are connected to the left/right middle rods through left/right connecting rods respectively.

A protective field screen system that includes a screen frame system (including a screen frame and a protective screen that includes a netting coupled to the screen frame), a base frame to be disposed on a supporting surface, and resilient members. The screen frame coupled to the base frame by way of the resilient members, and the resilient members to deform to facilitate movement of the screen frame relative to the base frame.

A trampoline including: a frame adapted to rest on the ground or be mounted on a plurality of spaced apart legs; a plurality of spaced apart flexible and resilient plates extending upwards from said frame and connected thereto against relative movement therebetween; and a jumping mat operatively connected to said plates above said frame for movement with said plates upon a person jumping thereon.

A system for creating a virtual environment is disclosed. The system has a barrier screen configured to stop an object including a ball that is moved toward the barrier, including a first barrier screen portion that is a cylinder section, and a second barrier screen portion that is disposed above the first barrier screen portion, wherein the second barrier screen portion is an elliptical section. The system also has at least one projector configured to project an image of the virtual environment on the barrier screen, at least one sensor configured to sense data associated with the object, and a computing device configured to control the at least one projector to change the image based on the sensed data.

A combination trampoline and pole device that may be used for exercise, adult entertainment, and/or recreational purposes. A retrofit trampoline and pole device that may be use with a water structure for exercise, adult entertainment, and/or recreational purposes. An entertainment system that may comprise a trampoline and a pole that may be used for exercise, adult entertainment, and/or recreational purposes.