Abstract: A multipurpose air-filled tent. The tent interior includes various equipment for household use, such as a mattress, a clothes closet, garmet hangers, a storage rack, storage bags. Three different models are designed for sleeping, bathing and dressing, respectively.

Abstract: A self-closing door hinge arrangement including two hinges with the structure which enables the hinges to be bolted together so as to rotate about a common axis, thereby allowing the door to swing in a balanced and smooth manner.

Abstract: A structural design of a tent for camping, particularly an inflatable amphibious tent which consists of a tent case, a guard tent and an air mattress connected with the internal base of the tent case. The tent case and air mattress each have a few valve holes for rapid inflation so that the tent can be erected on the land or on the water, and it is not necessary to construct supports. Since the base is an air mattress, the tent when used on land can be free of the discomfort resulting from accumulated water on rainy days and of the trouble of digging a ditch. The interior of the surface layer inner and outer annular edges of the upper annular surface and the outer annular edge of the lower annular surface of the air mattress respectively, wrap a cord or bead chain which winds about and crosses the air column of tent case so as to make structure of the tent case as a whole very firm, and to keep same balanced and stable while floating on the water.

Abstract: A spark plug including an air supplying system which supplies enough air to an internal-combustion engine to promote the required degree of combustion of the fuel in the engine and produces little carbon which might block the ventilation of air. The air supply system includes a removable filtering device for eliminating dust.

Abstract: A self-closing door hinge which may be mounted for clockwise or counterclockwise opening of a door. Hinge arms are provided which permit the hinge socket part and hinge axle to be uprightly oriented irrespective of the orientation of the hinge leaves to which they are fixed. The socket part includes an inner socket having a pair of vertically spaced, inclined, orbital rail grooves. The axle has recesses which hold ball bearings which support the socket part and ride in the grooves so that the door automatically closes when the door is released with the ball bearing on the inclined portion of the orbital grooves.

Abstract: The present invention provides fishing with a novel design of bait in the shape similar to small fish, shrimp, cuttle or other insects, wherein the foodstuff for inducing fish can be set and whereon there are a number of orifices, through which the said foodstuff can smell outward so as to induce the fish to bite.

Abstract: A self-closing door hinge is characterized as that the door can be automatically closed after opening the door and released by hand without any other power aid. Said self-closing door hinge comprises: A main hinge and two auxiliary hinges. Said main hinge is composed of: a right hinge leaf with sleeve, and a left hinge leaf with pivot. Said pivot of left leaf is provided with extended pin rollers which engage with the grooves in said sleeve of the right leaf.Said grooves are made horizontally from 0 degree through 50 degrees based on the zero degree line as door closing and then inclined upwards from 50.degree. through 180.degree.. Whenever opening the door, the pivot of the left hinge leaf fixed on the door will be rotated so that the pin rollers thereof may be slipped along the grooves so as to raise the left hinge leaf and door upwards against the right hinge leaf which is fixed on the door frame.