Patent ID: 7188392

Claim:
A spring fastener comprising a first side and a second side opposite the first side, the first side connected to the second side thereby forming a U-shaped structure having a cavity between the first side and the second side, a bottom portion wherein the first side and the second side are connected, and a top portion, the first side comprising a first engagement spring, the first engagement spring connected to the first side in the vicinity of the bottom portion, the second side comprising a second engagement spring, the second engagement spring connected to the second side in the vicinity of the bottom portion, each of the first and second engagement springs comprising a peak, a free end, and an engagement region between the peak and the free end, at least one engagement spring having two spring sides and a side-cut on each spring side, the side-cuts being across each other, thus forming a side-cut section aligned to be substantially parallel to the peak, each side-cut including an upper edge and a lower edge connecting with the respective spring side of the engagement spring.