Elastic plastics knob locking device - has locking projection on tubular shaft and interlocking elements between knob and hole surface

摘要

The device has a tubular projection compressible in at least one radial direction and guided in a hole. It carries at least one locking element gripping over the hole edge and thus locking the knob in its axial direction. The locking element (2c) forms on the contract surface (2d) at the guiding hole end (1b) an angle with the perpendicular to the knob axis, greater than the so-called self-blocking angle. Gripping into each other locking elements (3, 4) are provided on the contact surface between the knob (2) and the surface of the guiding hole.