Abstract: A spring fastener engages the rib of a first part, such as a plastic panel for example, like a pillar for example, may be engaged, and they are also suitable to be engaged reversibly in a slot of second part, such as a metal sheet for example, like the frame of a car for example. The spring fastener comprises engagement springs having a peak, engagement regions and-side cuts in the vicinity of the peak, for example within the engagement regions. The side-cuts, of preferably triangular shape, increase the lever/angle pulling force (pulling force applied on the first part and away from the spring fastener, in order to separate the first part from a second part connected together with the spring fastener). According to one embodiment, the fastener comprises barbs with inwardly bent front ends, and the engagement regions further have hindrance portions.

Abstract: A tether fastening device includes a tether clip and a strap to couple a first engagement structure, such as a vehicle chassis, and a second engagement structure, such as a body panel. The strap is coupled to the tether clip and couples the first engagement structure with the second engagement structure to allow for controlled detachment. When attached, the tether clip fastens the first engagement structure with the second engagement structure. For example, the tether clip and first engagement structure may detach from the second engagement structure; however, the strap controls the acceleration, speed and distance displaced between the first engagement structure and the second engagement structure. According to one embodiment, the tether clip may further include a tether cap integrated with the strap and a fastener clip operative to couple to the tether cap.

Abstract: A spring fastener characterized by a structure having a cavity in which the rib of a first part, such as a plastic panel for example, like a pillar, may be engaged, and is also suitable to be engaged reversibly in a slot of second part, such as a metal sheet for example, like the frame of a car. The spring fastener comprises engagement springs having a peak, engagement regions and-side cuts in the vicinity of the peak, preferably within the engagement regions. The side-cuts, of preferably triangular shape, increase considerably the lever/angle pulling force (pulling force applied on the first part and away from the spring fastener, in order to separate the first part from a second part connected together with the spring fastener). It is highly preferable that the fastener comprises barbs with inwardly bent front ends, and that the engagement regions further have hindrance portions, the combination of which highly improves the balance of insertion to removal ratio.

Abstract: The present invention pertains fasteners with critical configuration of the barbs, which allows the fasteners to be used in slots of various widths and panels of various thicknesses, and prevents rattling, which would take place in the case of fasteners of the present state of the art. The critical configuration is based on the special dimensions and special shape of the barbs with regard to the parts and the slots involved in assemblies of the fasteners and the parts. The present invention also pertains assemblies of miscellaneous parts connected together by means of the fasteners, as well as vehicles comprising such assemblies. In addition, the present invention comprises fasteners providing a combination of low barbs and high bent barbs, which combination prevents rattling of the fastener and allows secure attachment on a part, such as a sheet metal, for example.