Abstract: Disclosed is a maxillary skeletal expander including: a first body coupled to a maxilla; a second body opposing the first body and coupled to the maxilla; a gap adjusting member with a first and second threaded portion provided on both sides of a main body part and respectively screwed to the first body and the second body; and an anti-rotation plate having an anti-rotation member having an elastic protrusion that protrudes toward the main body and fits into an anti-rotation recess provided along an edge of one side of the main body, so that unintentional rotation of the gap adjusting member is prevented.

Abstract: A spraying nozzle assembly for a dishwasher which can widely spray a washing liquid toward utensils. The spraying nozzle assembly has an adapter fixedly connected to a washing liquid outlet of a pump, a rotary spray arm which is rotatably coupled to an upper portion of the adapter and receives a washing liquid from the pump through the adapter, a spraying nozzle for spraying the washing liquid introduced into the rotary spray arm toward utensils, and a spring assembly which is coupled to the spraying nozzle and allows the spraying nozzle to be moved in such a manner that the direction of the washing liquid being sprayed therefrom is varied. The spring assembly is coupled to a fixing shaft which is eccentrically disposed with respect to a rotating axis of the rotary spraying arm. The spraying nozzle assembly can spread the spraying range of the washing liquid being sprayed, so the utensils can be effectively washed and wasting of the washing liquid can be reduced.

Abstract: A pulsator of a washing machine for effectively washing small-sized or light weight articles. The pulsator has a rotating disc, and a cylindrical member having a chamber for receiving an article to be washed and integrally formed at a center of an upper surface of the rotating disc. The cylindrical member extends upward by a predetermined length. The pulsator has a lid for preventing the article received in the chamber from coming out of the chamber, and a plurality of vanes for generating a swirl shaped liquid flow. The vanes are regularly installed around an outer wall of the cylindrical member. The cylindrical member is formed at its outer wall with a plurality of holes for introducing/discharging a washing water into/from the chamber. The articles placed in the chamber of the pulsator are subjected to a relatively small centrifugal force, so the small-sized articles can be prevented from tangling with each other and prevented from being damaged.

Abstract: A directional changeover pump in accordance with the present invention is capable of changing the direction of a fluid flow depending upon the rotational direction of an impeller. The directional changeover pump employs a reciprocable member for opening one discharge port and closing the other discharge port. As a result, the directional changeover pump has an extended service life and a simplified structure, since the wear of the discharge ports is automatically compensated by a spherical configuration of a reciprocating member and the sealing member between the operating components is eliminated.