Patent ID: 8453402

Claim:
A frame unit of a curtain wall comprising: a mullion being a longitudinal elongated member and having a top surface; a bottom surface; a side surface; a linear mullion recess formed in the side surface of the mullion, formed through the top surface and the bottom surface of the mullion and having a bottom and an extending length; and a linear mullion channel formed in the bottom of the mullion recess and having an extending length the same as that of the mullion recess; a beam being a latitudinal elongated member, abutting the mullion and having two opposite end surfaces; a side surface; a linear beam recess formed in the side surface of the beam, formed through the end surfaces of the beam and having a bottom and an extending length, wherein the side surface of the beam having the beam recess abuts the side surface of the mullion having the mullion recess; and a linear beam channel formed in the bottom of the beam recess and having an extending length the same as that of the beam recess; and a connecting device securely connected with the mullion and the beam and having a first group connected with the mullion and having a plate mounted in the mullion recess; two chunks mounted in the mullion channel; and two bolts mounted through the plate and respectively screwed into the chunks; and a second group the same as the first group, mounted in the beam recess and the beam channel and having a plate, two chunks and two bolts, wherein the plate of the second group is connected securely with the plate of the first group.