Abstract:
A self inflatable mattress includes a main portion with a first chamber and a sponge in the first chamber, an extended portion and having a second chamber, a valve mounted on the main portion to allow surrounding air to enter the first chamber and a unidirectional valve received in the extended portion and sandwiched between the first chamber and the second chamber to provide alternate communication between the first chamber and the second chamber. A self expansion of the main portion due to the automatic expansion of the sponge from a compressed state to a non-compressed state allows the surrounding air to enter the first chamber, the air inside the first chamber is able to be forced to enter the second chamber by pushing away the unidirectional valve to resume communication between the first chamber and the second chamber so that the second chamber is inflated.
Abstract:
A plastic product is fabricated from plastic sheets by heat sealing the plastic sheets to form an enclosure member. In order to strengthen the heat-sealed joints of the plastic sheets, the plastic sheets are thickened at portions where the heat-sealed joints are to be formed. Preferably, the heat-sealed joints are formed in such a manner that the cross-section of the heat-sealed joints is smaller than that of the thickened portions of the plastic sheet, thereby preventing effectively the non-thickened portions of the plastic sheets from being affected adversely by the heat sealing process.
Abstract:
In a motor-driven air pump, a bottom wall and a surrounding barrier wall cooperatively confine a receiving space in which an impeller is mounted. The barrier wall is provided with angularly displaced first and second internal ports that communicate fluidly with first and second chambers, respectively. A first external port is disposed upstream of and communicates with one of the first and second chambers. A second external port is disposed downstream of and communicates with the other one of the first and second chambers.
Abstract:
An air mattress includes an upper sheet with a tufted top surface, a lower sheet, and front and rear sheets. The front sheet has upper, lower and lateral edges. The upper edge of the front sheet is sealed to a front edge of the upper sheet, is longer than the front edge of the upper sheet, and has excess portions on two sides of the front edge of the upper sheet. The rear sheet has upper edge, lower and lateral edges. The upper edge of the rear sheet is sealed to a rear edge of the upper sheet, is longer than the rear edge of the upper sheet, and has excess portions on two sides of the rear edge of the upper sheet. The lower sheet has a front edge sealed to the lower edge, the lateral edges, and the excess portions of the upper edge of the front sheet. The lower sheet has a rear edge sealed to the lower edge, the lateral edges, and the excess portions of the upper edge of the rear sheet. The lower sheet further has lateral edges sealed to lateral edges of the upper sheet. An air receiving space is confined by the upper, lower, front and rear sheets.
Abstract:
A boat impeller wheel includes a rotating shaft, and a plurality of supporting rods extending radially from the rotating shaft. An impeller vane is mounted rotatably on each of the supporting rods. When any one of the impeller vanes leaves water's surface, it can rotate about the corresponding supporting rod to a position appropriate for minimizing the splashes from the impeller vanes.