Abstract: A snap hook apparatus includes a shell, a bolt, a hook, two pins, a torsion spring and an elastic strip. The shell includes an annular rib formed on an internal side and teeth formed on the annular rib. The bolt includes two lugs, an annular shoulder, and a bore near the annular shoulder. The hook includes a catch at a first end and an aperture in a second end. The first pin is inserted in the first lug and used for engagement with the catch of the hook. The second pin is inserted in the second lug and the second end of the hook. The torsion spring includes a first end inserted in the bore of the bolt and a second end inserted in a recess defined between two adjacent ones of the teeth of the shell. The compression spring and the elastic strip are inserted in the shell.

Abstract: A snap hook apparatus includes a shell, a bolt, a hook, two pins, a torsion spring and an elastic strip. The shell includes an annular rib formed on an internal side and teeth formed on the annular rib. The bolt includes two lugs, an annular shoulder, and a bore near the annular shoulder. The hook includes a catch at a first end and an aperture in a second end. The first pin is inserted in the first lug and used for engagement with the catch of the hook. The second pin is inserted in the second lug and the second end of the hook. The torsion spring includes a first end inserted in the bore of the bolt and a second end inserted in a recess defined between two adjacent ones of the teeth of the shell. The compression spring and the elastic strip are inserted in the shell.

Abstract: A safety hook contains a body, a bolt member, a torsion spring, a spring coil, an elastic piece, and an actuation member. The body includes a recess and a through hole, the bolt member includes two orifices, an extension, and an aperture, such that a first foot of the torsion spring is limited in the aperture through the extension. The actuation member includes a chamber for receiving the elastic piece, the spring coil, the torsion spring, and the bolt member. The actuation member also includes two notches corresponding to each other, wherein the actuation member further includes a raised fence arranged in the chamber thereof below a notch of the upper end of the outer wall of the actuation member and includes a longitudinal slot formed on the raised fence, such that a second foot of the torsion spring is limited in the longitudinal slot of the actuation member.