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 fastener clip includes a base plate and a pair of laterally offset arms extending from the base plate. The fastener clip is operative for insertion into a hole (slot) defined in a first engagement structure, such as a vehicle chassis. At least four wings extend from the arms. Each wing includes at least one engagement portion including a depressed portion formed on each wing, wherein each depressed portion is operative to engage a portion of the hole. According to one embodiment, each arm is coupled to at least one wing at a distal end of each arm (i.e., a long arm), so that each wing extends inwardly towards the base plate. According to an alternative embodiment, each arm (i.e., a short arm) is coupled to the at least one wing, so that each wing extends outwardly away from the base plate.

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.