TUBE OF KARDASHEV FOR COLLECTING OF BALLS Russian patent published in 2025 - IPC A63B69/38 

FIELD: training devices.

SUBSTANCE: invention relates to training devices and accessories for playing tennis. Tube comprises, mounted on the tube body, a handle, a hinged trigger connected to a return spring, part of which enters the cavity of the tube body through a slot and prevents balls from falling out through the outlet opening of the tube body, wherein the trigger is installed with an indent from the other end of the body, providing, with the inclined position of the tube body, the possibility of accelerating the ball in the area from the location of the trigger to the end of the body. Second version of the tube has a retractable nozzle with a position fixing device, providing for the possibility, when the tube body is in an inclined position, to accelerate a tennis ball in the area from the location of the trigger to the outlet hole of the extended nozzle.

EFFECT: expansion of functional capabilities of tube for collection of balls due to provision of the possibility to use it both for collection of balls, and for throwing balls to a trainee.

2 cl, 3 dwg