Abstract: The present invention discloses a protective cover suitable for mounting on a display screen of an electronic device to protect the screen. The protective cover has a convex lens for magnifying the displayed information content. The convex lens can be turned to cover on the surface of the screen, thereby to magnify the information content displayed on the screen. In addition, the convex lens can be used as a magnifying glass when a user intends to read a document paper.

Abstract: A step-rotating device for rotatably connecting a first member and a second member. The step-rotating device includes a gasket movably connected to the first member and having a first surface with a hole, a base fixed on the second member and having a second surface, facing the first surface, with a shaft rotatably inserted into the hole and a plurality of annularly arranged recesses, and a plurality of rollers disposed between the gasket and the base.

Abstract: A liquid crystal display that can clamp a document is provided. The liquid crystal display comprises a display body and a holder. The display body is provided with a receiving portion. The holder is disposed at the display body in a manner such that it moves between a receiving position, located inside the receiving portion, and an use position for clamping the document.

Abstract: A thermal dissipation structure is suitable for use with a first and second housing members to be assembled with each other. The first and second housing members are provided with a first and second assembly structure, respectively. The first assembly structure includes a first contact surface and the second assembly structure includes a second contact surface. A plurality of recesses are arranged on either the first or second contact surface. The first and second housing members assemble with each other through engaging the first and second assembly structures into each other so that the first contact surface abut against the second contact surface, forming thereby a contact interface between the first and second housing members. The recesses form a plurality of ventilation passageways that communicate with an interior and an exterior of the first and second housing members along the contact interface to dissipate heat.

Abstract: A step-rotating device for rotatably connecting a first member and a second member. The step-rotating device includes a gasket movably connected to the first member and having a first surface with a hole, a base fixed on the second member and having a second surface, facing the first surface, with a shaft rotatably inserted into the hole and a plurality of annularly arranged recesses, and a plurality of rollers disposed between the gasket and the base.

Abstract: A liquid crystal display and its rotary assembly. The liquid crystal display comprises a displayer, a hinge, a first rotating member, a base, and a second rotating member. The hinge is connected to the displayer, and is disposed on the first rotating member. The first rotating member is disposed on the base. The second rotating member is disposed in the base in a manner such that the second rotating member and the first rotating member rotate together.

Abstract: A precaution hose is a hollow cylindrical body made of waterproof material with a length thereof being cut as the actual need. Two seal plates are attached to the two ends of the cylindrical body respectively. A valve is mounted to the cylindrical body. The seal plates are touched to the edges of a gap thereof tightly and the cylindrical body is filled with the liquid till being full completely so that a lower part of the cylindrical body can press against the floor due to an inner liquid pressure to keep the floodwater out.

Abstract: A covering structure, comprising a case and supporting element pivotally connected to the case. The supporting element may be oriented between two positions. The supporting element also incorporates a supporting socket, provided as a carrying holder when oriented in the first position. Additionally, the supporting socket integrates the ability to contain objects when oriented in the second position.

Abstract: A liquid crystal display with a ball-and-socket mounting joint is provided. The liquid crystal display comprises a display body, a ball-and-socket mounting joint and a base. The ball-and-socket mounting joint is disposed on the display body. The base is connected with the display body via the ball-and-socket mounting joint so that the display body is rotatably disposed on the base. Thus, the liquid crystal display can rotate smoothly with a simpler structure and at a lower cost.

Abstract: A liquid crystal display that can clamp a document is provided. The liquid crystal display comprises a display body and a holder. The display body is provided with a receiving portion. The holder is disposed at the display body in a manner such that it moves between a receiving position, located inside the receiving portion, and an use position for clamping the document.

Abstract: A thermal dissipation structure is suitable for use with a first and second housing members to be assembled with each other. The first and second housing members are provided with a first and second assembly structure, respectively. The first assembly structure includes a first contact surface and the second assembly structure includes a second contact surface. A plurality of recesses are arranged on either the first or second contact surface. The first and second housing members assemble with each other through engaging the first and second assembly structures into each other so that the first contact surface abut against the second contact surface, forming thereby a contact interface between the first and second housing members. The recesses form a plurality of ventilation passageways that communicate with an interior and an exterior of the first and second housing members along the contact interface to dissipate heat.

Abstract: A covering structure, comprising a case and supporting element pivotally connected to the case. The supporting element may be oriented between two positions. The supporting element also incorporates a supporting socket, provided as a carrying holder when oriented in the first position. Additionally, the supporting socket integrates the ability to contain objects when oriented in the second position.