Detachable two-partite connecting arrangement

Claim 1

A two-partite connecting arrangement for structural parts provided with similar apertures adapted to be aligned, characterized by a plug-type connector means having a head portion and a shank portion of diametric dimension complementary to the apertures and of an axial length greater than twice the thickness of a structural part, a groove being provided in said shank portion at a location corresponding approximately to twice the thickness of a structural part thereby forming in effect a reduced shank portion, and said shank portion passing over into its exposed bottom surface of smaller diameter than the diameter of the shank portion by way of annular inclined camming surface means, and locking means including base body means, which is provided with an open ended aperture means of a width complementary to the reduced shank portion, and frictional forceproducing means on said locking means in the form of a bent-back part connected to but spaced from the opposite surface of said base body means, said bent-back part being connected with said surface means by a web portion provided with opening means enabling insertion therethrough of said end portion underneath said bent-back part, said bent-back portion including a first section adjoining said web portion and extending toward said base body means and a second section adjoining said first section and extending away from said base body means, said first and second sections subtending an obtuse angle with the apex thereof approaching the base body means, the distance from the lowest point of the bent-back part formed by said apex to said base body means being less than the distance from the groove surface of the shank portion closest to its exposed bottom surface, said first and second sections having a length which is greater than length of said aperture means less the diameter of said shank portion and the angle of said second section being generally of the same order of magnitude as the angle of said camming surface means and of such length that at least a part of said second section always overlaps and faces said camming surface means when the groove on said shank portion engages the inner end of said aperture means to provide an automatic camming up as the apex rides up on said camming surface means during disconnection.