Abstract: A key ring assembly comprised of a key ring holder made from a circular casing having two opposite shoulders with a T-shaped sliding way invertedly defined around a peripheral wall thereof, a key ring connector secured to said key ring holder for holding a key ring, said key ring connector having an expanded head inserted through a notch on one shoulder above said T-shaped sliding way, a control knob for controlling a sliding rod in opening or closing said notch for inserting or disconnecting said key ring connector.

Abstract: A key ring holder comprising a hanger loop secured to two symmetrical passage ways on a circular groove around the peripheral wall of a flat, circular base thereof by a metal bolt, a compression spring and a washer is disclosed. The compression spring and the washer are sleeved on the metal bolt and stopped between a contracted hole at one end of a stepped through hole inside the flat, circular base and an expanded bottom end of the metal bolt. The hanger loop is constantly pulled downwards by the compression spring and the metal bolt to block up the two symmetrical passage ways. Pulling the hanger loop upwards from the flat, circular base and rotating it sideways causes the two symmetrical passage ways to be opened for fastening key rings to the circular, flat base.

Abstract: The present invention relates to a plate block key ring, wherein several plate blocks are combined with a swivel shaft, so as to be enable the blocks to rotate. These plate blocks have peripheral rails to form key ring outlets that allow keys to be readily attached to and detached from the ring. A locating spring device is disposed between the plate blocks which can define certain positions of the plate blocks after they rotate to relative angular positions.

Abstract: A fastening device comprising a curved clamping plate bent into shape from an elongated, resilient plate which has an elongated slot longitudinally disposed at one end, a square recess spaced from said elongated slot and a hole disposed at an opposite end for holding a key chain; and a substantially Z-shaped strip spring having one end fixedly secured to said elongated slot at one end through welding joint before said elongated, resilient plate being bent into shape. The strip spring is squeezed to produce a spring force, when the curved clamping plate is clamped on an object, to rub said object against the square recess so as to firmly retain said object therebetween.

Abstract: A key-ring assembly comprising a casing having fastened therein a lock bolt mechanism, a locating device and a blade cutter. The blade cutter can be rotated out of or inside the casing within an angle of 180 and is controlled by the locating device to position at three predetermined positions. The lock bolt mechanism comprises two opposite bolts respectively controlled to move forward and backward by two push knobs so as to respectively close or open a slide way for the fastening therein of key-rings, and an opening for mounting the casing on the waist belt.

Abstract: A latch assembly includes a latch that can reciprocatingly move between an extended, latching position and a retracted, unlatching position. A latch-guiding lever having a recessed slot extends into a transverse hole in the latch. A plug member under the elastic force of a spring is urged into the recessed slot, thereby preventing any loosening or slipping-off of the latch-guiding lever from the latch. A pull element may be provided to separate the plug member from the latch-guiding lever to thereby enable disassembly of the latch assembly.