Abstract: A trailer coupling for a motor vehicle comprises a coupling arm, on the free end region of which a ball neck is formed, on which a coupling ball is arranged. The coupling ball is spherical on the side facing away from the ball neck and has a spherical segment plane on the side facing the ball neck. Between the spherical segment plane and a portion of the ball neck has a smaller outer circumference than the spherical segment plane there is arranged a throat portion having a transition contour extending in a concave manner between the ball neck and the spherical segment. The transition contour transitions with a coupling ball transition region into an external contour of the coupling ball and transitions with a ball neck transition region into an outer surface of the ball neck. The transition contour has a curved configuration having a non-constant radius.

Abstract: The invention relates to a holding device (1), especially for fixing a glass substrate during a cutting process. The holding device comprises a housing (2) and a plunger (3) which can be axially displaced in relation to the housing (2). The plunger has a first and a second end section (4, 5), the first end section (4) projecting from the housing (2) and having a suction element (6). The aim of the invention is inter alia to improve a known holding device in such a manner that the substrate can be approached and fixed almost without the application of force. The holding device (1) according to the invention is characterized in that the plunger (3) is received in the housing (2) by a pneumatic spring. A holding system (20) comprising a plurality of holding devices (1) is protected in a support plate (24), the support plate (24) having a vacuum channel collector (21) which is connected to vacuum channels (13) and which is connected to a common vacuum pump (14).

Abstract: The invention relates to a holding device (1), especially for fixing a glass substrate during a cutting process. Said holding device comprises a housing (2) and a plunger (3) which can be axially displaced in relation to the housing (2). The plunger has a first and a second end section (4, 5), the first end section (4) projecting from the housing (2) and having a suction element (6). The aim of the invention is inter alia to improve a known holding device in such a manner that the substrate can be approached and fixed almost without the application of force. The holding device (1) according to the invention is characterized in that the plunger (3) is received in the housing (2) by a pneumatic spring. A holding system (20) comprising a plurality of holding devices (1) is protected in a support plate (24), said support plate (24) having a vacuum channel collector (21) which is connected to vacuum channels (13) and which is connected to a common vacuum pump (14).