Abstract: A lock bolt is disclosed for introduction into a through hole in a structural component. The lock bolt generally is a one piece tubular bolt member having a shank with two sections joined at a first end by a bridge and with a resilient locking member integral with a first of the two sections at a second end and extending within the bolt shank and then radially outward of the bolt shank at the second of the two sections to define an end portion to in conjunction with an abutment on the bolt secure the bolt in the through hole.

Abstract: There is disclosed a ball cup for a ball bearing with a shaft and with a hollow space for the reception of a ball head accessible by way of an entrance opening, in the case of which at a distance from the wall of the hollow space at least two slits are provided symmetrically in relation to the hollow space and essentially in longitudinal direction of the shaft in such a way that in the case of the introduction of the ball head through the introducing opening into the hollow space, the bridges located between the wall of the hollow space and the slits may be shifted to the outside in a radial direction based on the bridges narrowing the entrance opening and that they will again shift in a radial direction inward after introduction of the ball head into the hollow space.

Abstract: A ball-and-socket joint wherein the socket has a head with a spherical cavity and a one-piece or two-piece shank which extends radially from the spherical external surface of the head. The head is formed with a lateral opening whose diameter is normally less than the diameter of the cavity so that insertion of the ball into and its withdrawal from the cavity through the opening necessitates an enlargement of the opening. This is achieved by forming the external surface of the head with recesses which entail a reduction of the thickness of the corresponding portions of the head and enable the head to expand so that the ball can pass through the opening. That portion of the head which is disposed diametrically opposite the shank and is adjacent to the opening is not formed with recesses. If the shank is made of two sections, such sections can be assembled by snap action and they can confine the end portion of a motion transmitting or motion receiving member.

Abstract: A fastening element for detachably connecting two plate-like components is disclosed as including a headpiece having a projection that can be passed through an elliptical hole in the first component and locked therein by rotating the element in one direction, and a square shaft opposite the headpiece that can be locked within a square hole in the second component by rotating the element in the opposite direction.