Abstract: A device for squeezing tubes consisting of two press rolls (1) arranged facing each other which can be placed onto the sides of a tube. Into the face side openings (1a) of the press rolls (1) pot-shaped sleeves (2) are inserted. These pot-shaped sleeves (2) towards the inside are provided with bottom parts (2a) with passage openings (2b). Into each of the pot-shaped sleeves (2) arranged superimposed of the press rolls (1) the arms (3a,b,c) of U-shaped spring clamps (3) are inserted through the passage openings and are guided shiftably therein. The end parts (3c) of the arms (3a,b,c) of said spring clamps (3) each are provided with a protrusion (4) which blocks passage of the arms (3a,b,c) through the passage openings (2b).

Abstract: A device comprising a body with a sleeve slidably mounted thereon and attached to a blade which is slidably engaged ina longitudinal slot provided in the body and forming a sheath for said blade. A spring arranged within the sleeve between it and the body holds the blade in a retracted position inside the sheath. The projecting end of the body has four points for positioning the device relative to the needle to be threaded and the thread, and within range of a tip of the blade which may be "unsheathed" by manually moving the sleeve towards said points and said needle so that on the way it engages the thread between the points and leads it through the eye of the needle.

Abstract: In a training device for sports equipment, especially for serving tennis balls, the balls are supplied from a storage container through a laterally pivotable charging opening to a ball supply device. The ball supply device includes an endless belt circulating vertically over two rollers and the balls are rolled upwards beneath a lower roller and between the endless belt and a side wall of a housing of the ball supply device and roll over an upper roller into a waiting position. From the waiting position the balls arrive in a serving position on curved guide tracks of a supporting and guiding device provided with a ball striker. Between the guide tracks, a rotatable serving device is arranged on a base plate and is connected to a central shaft and a driving device for rotation therewith. The serving device has a serving plate pivotable into the ball serving track. The serving frequency and the flight path of the balls are adjustable through a control device.