Abstract: In a clasp (1), a male member (2) has a columnar insertion portion (23) and a female member (4) has a cylindrical housing portion (43). The clasp (1) has magnets which attract the insertion portion (23) into the housing portion (43). A male engagement body (3) is provided on an outer peripheral surface (23a) of the insertion portion (23) of the male member (2) while a female engagement body (5) is provided on an inner peripheral surface (43a) of the housing portion (43) of the female member (4). The male engagement body (3) and/or the female engagement body (5) is provided as a long protruding edge structure or a long recessed notch structure along the axis of the clasp (1), has a guiding portion (53), and also has a retaining portion (52) which prevents the insertion portion (23) from getting out of the housing portion (43).

Abstract: To provide a clasp that is capable of satisfying both of operational convenience and freedom in design when provided to an accessory or the like. In a clasp 1 including a male member 2 consisting of a columnar insertion portion 23, and a female member 4 including a cylindrical housing portion 43 housing the insertion portion 23, the insertion portion 23 and the housing portion 43 each include attraction members arranged to attract the insertion portion 23 into the housing portion 43 by magnetic attraction force. A male engagement body 3 is provided on an outer peripheral surface 23a of the insertion portion 23 of the male member 2 while a female engagement body 5 is provided on an inner peripheral surface 43a of the housing portion 43 of the female member 4.

Abstract: A pin fastener includes a cylindrical body into which a pin is inserted, a coil spring wound on the outer periphery of the cylindrical body, and an outer cylindrical body surrounding the outer periphery of the cylindrical body and coil spring. A cut is provided in the cylindrical body, and a linear fastening portion of the coil spring is fitted into the cut, thereby forming a pin fastening narrowed portion between the fastening portion and a wall portion of the cylindrical body opposed thereto.

Abstract: A pin fastener is configured of a cylindrical body into which a pin is inserted, a coil spring wound on the outer periphery of the cylindrical body, and an outer cylindrical body surrounding the outer periphery of the cylindrical body and coil spring, wherein a cut is provided in the cylindrical body, and a linear fastening portion of the coil spring is fitted into the cut, thereby forming a pin fastening narrowed portion between the fastening portion and a wall portion of the cylindrical body opposed thereto. The pin fastener has a simple configuration formed of an extremely small number of parts which are easy to manufacture and assemble, and moreover, a superior working effect in a pinning device can be expected therefrom.

Abstract: A fastener including a pin holder and a pin in which is provided a holding portion in a leading extreme portion vicinity, wherein the pin holder, by bend forming a central portion of a longitudinal direction of a thin plate-like spring material, is formed to have a triangular side view shape formed by an apex and a pair of inclining portions on either side thereof and, as well as providing a pin holder hole for inserting a pin in the apex, a pair of holding members, of a length such as to lock onto the holding portion of the pin inserted into the pin holder hole, protrude from a peripheral portion of a longitudinal direction in the pin holder hole, in the same direction as the inclining portions. According to this invention, a pin holder type fastener with a small pin insertion force but a large pin extraction force, with which moreover it is possible to end a pinning condition with an easy operation, is provided.

Abstract: A clamping tool of chain ends of an accessory in which a holder provided at one end of a chain portion of the accessory is engaged with a holder receiver provided at the other end of the chain portion to be interlocked with each other, wherein the holder and the holder receiver are respectively provided as attracting members with magnets attracting each other or with a magnet and a metal material attracted by the magnet at positions capable of guiding the holder and the holder receiver to a proper engaging location. In accordance with the invention, a pair of interlocking members can be guided to and located at proper interlocking positions with respect to each other without depending on visual observation.

Abstract: A clamping tool of chain ends of an accessory in which a holder provided at one end of a chain portion of the accessory is engaged with a holder receiver provided at the other end of the chain portion to be interlocked with each other, wherein the holder and the holder receiver are respectively provided as attracting members with magnets attracting each other or with a magnet and a metal material attracted by the magnet at positions capable of guiding the holder and the holder receiver to a proper engaging location. In accordance with the invention, a pair of interlocking members can be guided to and located at proper interlocking positions with respect to each other without depending on visual observation.

Abstract: A water tank filter having a double structure including an inner filter having a small pore size for trapping fine particles of filth from tank water and situated within a hollow outer filter having a large pore size for trapping coarse particles of filth. The inner filter is situated in roughly the upper half of the internal space of the outer filter. Disclosed also is a water tank purifier including the water tank filter. The water tank filter and purifier can effectively remove both coarse and fine particles of filth from a water tank. The filter does not quickly get clogged, and is easy to handle.

Abstract: A water tank filter having a double structure including an inner filter having a small pore size for trapping fine particles of filth from tank water and situated within a hollow outer filter having a large pore size for trapping coarse particles of filth. The inner filter is situated in roughly the upper half of the internal space of the outer filter. Disclosed also is a water tank purifier including the water tank filter. The water tank filter and purifier can effectively remove both coarse and fine particles of filth from a water tank. The filter does not quickly get clogged, and is easy to handle.