Abstract: A light-emitting wireless charging structure includes a base, a wireless charging module, a light-emitting element and an upper cover. The wireless charging module is disposed on the base. The light-emitting element is disposed on the base adjacent to the wireless charging module. The upper cover covers the wireless charging module and the light-emitting element. The upper cover has a lower surface facing the wireless charging module and an upper surface opposite to the bottom surface. When the light-emitting element emits light, light coming from the light-emitting element passes through the upper cover and forms a mark on the upper surface to indicate the position of the wireless charging module. When the light-emitting element is turn off or kept in an off state, either the mark that has been formed on the upper surface disappears therefrom or no any mark is ever shown on the top surface.

Abstract: A cursor calibration method includes setting a threshold angle, and when an angle of elevation between a pointing direction of a pointer and a horizontal plane is reduced from greater than the threshold angle to smaller than or equal to the threshold angle, displaying the cursor of the pointer on a predetermined position of a display.

Abstract: A light-emitting wireless charging structure includes a base, a wireless charging module, a light-emitting element and an upper cover. The wireless charging module is disposed on the base. The light-emitting element is disposed on the base adjacent to the wireless charging module. The upper cover covers the wireless charging module and the light-emitting element. The upper cover has a lower surface facing the wireless charging module and an upper surface opposite to the bottom surface. When the light-emitting element emits light, light coming from the light-emitting element passes through the upper cover and forms a mark on the upper surface to indicate the position of the wireless charging module. When the light-emitting element is turn off or kept in an off state, either the mark that has been formed on the upper surface disappears therefrom or no any mark is ever shown on the top surface.

Abstract: A cursor calibration method includes setting a threshold angle, and when an angle of elevation between a pointing direction of a pointer and a horizontal plane is reduced from greater than the threshold angle to smaller than or equal to the threshold angle, displaying the cursor of the pointer on a predetermined position of a display.

Abstract: A bicycle air pump includes an air cylinder; a joining member on the cylinder and including upper, intermediate and lower chambers, and a passageway communicating the cylinder with the lower chamber and a relief valve; an activation assembly on the joining member and including a hollow spring-loaded stem in both the intermediate chamber and the lower chamber, an end seal, a cap on the upper chamber, a push rod through the cap to urge against the seal and having an axial hole and a lateral hole communicating with the axial hole, a knob secured to the push rod and the cap, and an outlet; a pressure gauge on the joining member and communicating with the passageway; an inlet assembly secured to bottom of the cylinder and including a check valve; and a blocking member secured to bottom of the stem for blocking the passageway when in an inoperative position.

Abstract: A pressure regulator for paint ball gun includes a first housing including a hollow projection on a first end surface, an axial channel through the projection, and a connector on a second end surface; an output pressure gauge on the first housing; a check valve on the first housing; a pressure regulation assembly including a sleeve fastened in the channel and having an axial tunnel, a biasing member in the tunnel, and a hub on the biasing member; a hollow second housing including an internal space with the projection disposed therein, and holes on an end, each hole having overlapping circular portions and of larger and smaller sizes; and fasteners through the overlapping circular portions of smaller size of the holes into the first housing. In an unfastened state of the second housing, the fasteners are through the overlapping circular portions of larger size of the holes.

Abstract: A portable air tank includes a reservoir including a space for containing compressed air, an upper neck, a channel through the neck, internal threads on a surface of the channel, external threads on an outer surface of the neck, and an annular bottom in the channel; a communication member in the channel and including a stem, a tunnel in the stem, and an annular member on a bottom of the stem and rested on the annular bottom; a sealing ring rested on the annular member; and a cap including an axial hole for receiving the stem, external threads secured to the internal threads to urge the annular member against the annular bottom for airtight purposes, and a top handle member.

Abstract: A planter is provided with concentric U-shaped first ridges on a first half portion of a bottom; concentric U-shaped second ridges on a second half portion of the bottom; concentric U-shaped first recesses on a first half portion of an underside; concentric U-shaped second recesses on a second half portion of the underside; a corrugated wall; a flange on a top of the corrugated wall; an upstanding lip on an outer edge of the flange; and a board insert on the flange and including a top surface, a flange member on a bottom edge of the top surface, and rows of bottom holes each having an annular wall.

Abstract: A pressure regulator for paint ball gun includes a first housing including a hollow projection on a first end surface, an axial channel through the projection, and a connector on a second end surface; an output pressure gauge on the first housing; a check valve on the first housing; a pressure regulation assembly including a sleeve fastened in the channel and having an axial tunnel, a biasing member in the tunnel, and a hub on the biasing member; a hollow second housing including an internal space with the projection disposed therein, and holes on an end, each hole having overlapping circular portions and of larger and smaller sizes; and fasteners through the overlapping circular portions of smaller size of the holes into the first housing. In an unfastened state of the second housing, the fasteners are through the overlapping circular portions of larger size of the holes.

Abstract: A gas cylinder is provided with a pressure regulator including a valve body including an upper first chamber, intermediate second and third chambers, a lower channel threadedly secured to and communicating with a container body, a passageway having one end communicating with the container body, a lower through hole communicating with the intermediate third chamber and the channel, and an internally threaded top neck; a high-pressure safety valve; a low-pressure safety valve; a coupler on the valve body; a moveable member on a bottom of the intermediate third chamber; a spring biased hollow member in the intermediate second chamber and having a bottom engaged the moveable member; an externally threaded stem in the upper first chamber and complimentarily disposed on the hollow member; a hollow cap threadedly secured to the stem and the neck respectively; and a knob mounted on the stem.

Abstract: A bicycle air pump includes an air cylinder; a joining member on the cylinder and including upper, intermediate and lower chambers, and a passageway communicating the cylinder with the lower chamber and a relief valve; an activation assembly on the joining member and including a hollow spring-loaded stem in both the intermediate chamber and the lower chamber, an end seal, a cap on the upper chamber, a push rod through the cap to urge against the seal and having an axial hole and a lateral hole communicating with the axial hole, a knob secured to the push rod and the cap, and an outlet; a pressure gauge on the joining member and communicating with the passageway; an inlet assembly secured to bottom of the cylinder and including a check valve; and a blocking member secured to bottom of the stem for blocking the passageway when in an inoperative position.

Abstract: A siphon includes a hollow member including an upper enlargement, intermediate external threads, and lower external threads; an internally threaded ring secured to the intermediate external threads; a guide tube including a plurality of annular grooves on an outer surface, the guide tube being moveably partially disposed in the hollow member; a plurality of O-rings in the annular grooves; a tubular member around the guide tube and secured to the upper enlargement, the tubular member including a plurality of openings; and a sleeve moveably put on the tubular member.

Abstract: A gas cylinder is provided with a pressure regulator including a valve body including an upper first chamber, intermediate second and third chambers, a lower channel threadedly secured to and communicating with a container body, a passageway having one end communicating with the container body, a lower through hole communicating with the intermediate third chamber and the channel, and an internally threaded top neck; a high-pressure safety valve; a low-pressure safety valve; a coupler on the valve body; a moveable member on a bottom of the intermediate third chamber; a spring biased hollow member in the intermediate second chamber and having a bottom engaged the moveable member; an externally threaded stem in the upper first chamber and complimentarily disposed on the hollow member; a hollow cap threadedly secured to the stem and the neck respectively; and a knob mounted on the stem.