Patent ID: 8978952
Filing Date: 2015-03-17
Classification: B25C

Abstract:
1. A spring energized fastening device including a housing, a power spring, a striker movable vertically at a front of the housing, and a fastener, the fastening device comprising: a rest condition and a pre-release condition of the fastening device, the power spring being deflected in the pre-release condition whereupon the power spring is released to eject and install the fastener from the fastening device through energy stored in the deflected power spring; the power spring being a torsion type including coaxial coils with at least four arms extending forward therefrom; wherein the four arms include a first pair of arms being outer arms near a location of the coils, the first pair crossing a second pair of arms to become inner arms forward of the crossing location; and the power spring including a normal rest position wherein the arms are substantially vertically coincident at the crossing location and the first pair of arms presses the second pair of arms at the crossing location.