Abstract: A skating training aid consisting of a base plate that slides on the ice—or rolls on any other less slippery surface—and is made of a series of telescoping adjustable rods and the said device can also accept weight plates to adjust the level of strength required to push it while practicing skating movements.

Abstract: A handle for holding and securing telescoping tubings has a handle which when turned, partially threads in or threads out a threaded knob. According to which direction the handle is turned, it causes a block to either become tighter when the threaded knob is threaded in or looser when the threaded knob is threaded out. This either pushes the inner tubing towards the opposite faces of an outer tubing when threading in and increase the friction between the inner and the outer tubing or reduce the friction between the inner tubing and the outer tubing by loosening the block when threading out.

Abstract: A skating training aid consisting of a base plate that slides on the ice—or rolls on any other less slippery surface—and is made of a series of telescoping adjustable rods and the said device can also accept weight plates to adjust the level of strength required to push it while practicing skating movements.

Abstract: The device for injecting a fluid into a network comprises storage and supply means (1, 2) for the fluid to be injected, an injector (11) and a proportioning unit (7) to obtain a constant injection ratio. The injector (11) comprises two housings (12) each provided with a fluid-tight pocket (15) of variable volume. Said injector further comprises two distributors (16,17): a first distributor (16) providing for the filling of a pocket (15a) with the fluid to be injected and simultaneously for the emptying of the other pocket (15b): a second distributor (17) providing in parallel for the filling with an auxiliary fluid of the housing (12b) containing the pocket (15b) being emptied and simultaneously for the emptying of the other housing (12a). The injector (11) finally comprises actuation means adapted to generate in synchronism a switching of the distributors (16, 17) so as to invert the function of the housings (12) and of the pockets (15).