CS235495B1 - Equipment for automatic firing of tennis balls - Google Patents

Abstract

A device for automatically firing tennis balls for practicing the game from beginners to practicing strokes of competitive players. ! · The purpose of the solution according to the invention is to use even a small air pressure for firing balls fed by a rotating drum magazine into the firing part, which is connected to a sealed box by a flexible hose.

Description

The invention relates to a device for not automatically firing tennis balls for practicing the game from beginners to practicing strikes by racing players.

Known devices for firing tennis balls utilize the forces of compression or tension springs or the energy of rotating wheels. These devices for firing tennis balls have disadvantages, especially in their complexity, while at the same time they cannot be expected to have the same running of the device or the planned continuous change of the ball's power or direction or wide change of the time of ball shooting.

These drawbacks are eliminated to a minimum by the tennis ball automatic firing device according to the invention. SUMMARY OF THE INVENTION The invention is based on the fact that a rotatable drum container with a sealing flap covering the opening for the balls is placed on a sealed box with a source of compressed air. A flexible hose of the ejection device opens to the ball opening of the rotating drum magazine, at the other end of which a retainer is attached, from which the tube is provided with openings, a housing, an adjusting device and a ball rectifier.

Benefits? The solution according to the invention consists in simplicity and low weight, with the possibility of a large supply of balls and great mobility on the pitch.

The attached drawing shows in longitudinal section an exemplary embodiment of an apparatus for automatically firing tennis balls. The device consists of a rotatable drum cartridge 1 located on a sealed box 12, with a source of compressed air 11. Under the ball hole 1 of the drum cartridge 1, there is a sealing flap 2. the second end is provided with a retainer 22. The retainer 22 passes into a tube 23 which is provided with openings 24 and a housing 28. The tube 23 itself is movably connected to the adjusting device 25 and is provided with a ball baffle 26.

After the automatic ball firing device has been put into operation, the tennis silence from the drum cartridge 1 will fall through the hole 3 for the balls into the flexible hose 21 · The air pressure from the compressed air source 11 closes the ball hole 2 with sealing flap 2 such that the ball remains in the retainer 22 until the pressure in the sealed box 10 exceeds the force exerted by the retainer 22 on the ball. Thereafter, the ball leaves the retainer 22 and is fired through a tube 21 which directs its path through openings 24, which may be obscured by the housing 28 for this purpose. The positioning path 25 of the ball also includes an adjusting device 25 and a ball direction rectifier 26.

The duty cycle of the tennis ball automatic firing device may continue as long as the drum rotating magazine contains the balls or until the device is switched off by the control device.

Claims (2)

An apparatus for automatically firing tennis balls, characterized in that it consists of a rotatable drum magazine (1) placed on a sealed box (10) with a source of compressed air (11) which has a sealing flap (2) covering the ball hole (3) to which a flexible hose (21) of the ejection portion (20) extends, at the other end of which a retainer (22) extends into a tube (23) provided with openings (24) and a housing (28), the tube (23) being connected to adjusting device (25). Device according to claim 1, characterized in that the tube (23) is provided with a ball baffle (26).