Oblique fastening apparatus

An oblique fastening apparatus that is operable with a clamping tool for clamping and positioning a workpiece, said oblique fastening apparatus comprising:

• a first clamping unit including a first main body having two opposite ends, a first guide member connected to one of said, two opposite ends of said first main body, a first clamping member extending transversely from said one end of said first main body in a direction opposite to said first guide member, and a first oblique fastener passage that is inclined with respect to said first main body and that extends through said first guide member and said first clamping member, said first oblique fastener passage having a first discharge section located between said first guide member and said first clamping member and communicating with ambient atmosphere;
• a second clamping unit including a second main body that has two opposite ends and that is configured to be driven by the clamping tool to move relative to said first main body, and a second clamping member extending transversely from one of said two opposite ends of said second main body in a direction similar to that of said first clamping member, said first and second clamping members being configured to clamp the workpiece therebetween;
• and
• a guide unit including a first guide structure formed as a groove in said first main body, and a second guide structure formed as a tongue on said second main body, said tongue extending into said groove from the other one of said two opposite ends of said first main body to slide in said groove and to guide relative movement of said first and second main bodies, said tongue and said groove being distally spaced from said one ends of said first and second main bodies.