Abstract: An improved warming bed for pets generates different temperatures on two opposite sides of the bed to warm different pets in different climate conditions. The warming bed includes an upper panel and a lower panel. The inner surfaces of the upper panel and the lower panel have corresponding coupling struts and stubs and at least one press strut to form a gap of a selected distance between the upper panel and the lower panel. A heating sheet is bonded to the inner surface of the lower panel (or the upper panel) and passes through the coupling struts and stubs. When the heating sheet is heated, the lower panel in contact with the heating sheet has a higher temperature than the upper panel which is remote from the heating sheet. Thus the two sides of the warming bed have different temperatures to meet different requirements.

Abstract: An improved aquarium heater and particularly an aquarium heater that has a protective device adjacent to an electric heating coil to cut off the electric circuit when the heater is overloaded to prevent the heating coil from continuously heating to avoid risks and hazards includes a glass tube housed a circuit board in an upper section thereof, a heating coil located below the circuit board connecting to the circuit board, a control plug sealed the top opening of the glass tube, and a protective device bridging the heating coil and the circuit board. The protective device cuts off circuit operation when total circuit is overloaded and overheated to ensure safely use of the heater.

Abstract: An air pump for a fish-tank comprises a compartmental air chamber assembly formed by a base plate and a casing in the body. Hence, an indirect prolonged air path is formed in the air chamber assembly, resulting in a great reduction of noise generated while operating.

Abstract: An air pump for a fish-tank comprises a compartmental air chamber assembly formed by a base plate and a casing in the body. Hence, an indirect prolonged air path is formed in the air chamber assembly, resulting in a great reduction of noise generated while operating.

Abstract: A fish egg-laying tank comprises a housing secured to a fish tank including a recess in the bottom having a plurality of openings on the top, an egg-laying container supported on the housing including an inverted cone-shaped member and a hole at the small end, an air chamber in the rear of housing in communication with the container, and a filter tank fitted in the recess. Water in the housing is flowed when air is pumped thereinto such that the solved feces of fishes are flowed onto the filter tank through the inverted cone-shaped member, the hole and the top openings of the recess and the eggs of fishes are dropped onto the bottom of the housing other than the filter tank through the inverted cone-shaped member and the hole.

Abstract: The present invention relates to a sound elimination structure for an air pump, especially an air pump which is used in an aquarium. The sound elimination structure includes a sound elimination device including an air chamber box, and an air chamber cover secured with each other and defining a plurality of chambers therein. The air chamber cover and the air chamber box are provided with air guide tubes, recesses, air holes co-operating with catch plates so as to increase the path of the air flow, thereby reducing the velocity of the air flow so as to eliminate the noise.

Abstract: An air pump assembly including a one-piece pump stock provided with a base portion defining a first recess for receiving a rubber cushion, the pump stock being attached to an interior wall of a pump casing by securing the base portion within a second recess formed on the interior wall by opposed inwardly directed flanges.

Abstract: A structural improvement made in the air pump usable in either a single or a plurality of fish bowls. The diaphragms used to prevent the air from flowing in reverse are specially designed in a shape which can be inserted into the outlet of air circulating ports of the pump so as to prevent the diaphragms from slipping away and detaching from the air circulating ports, and finally losing the one-way discharge function accordingly.