Abstract: A biaxial synchronization dual-shaft hinge includes a pivot shaft set including a first pivot shaft and a second pivot shaft arranged in parallel for the mounting of the top cover member and bottom base member of a dual-leaf mobile electronic device, a transmission device set including an interlocking member having a first pivot hole and a second pivot hole respectively coupled to the first pivot shaft and the second pivot shaft, a first driving member pivotally mounted in the first pivot hole and a second driving member pivotally mounted in the second pivot hole for enabling the first pivot shaft and the second pivot shaft to be synchronously rotated in reversed direction steadily.

Abstract: A biaxial synchronization dual-shaft hinge includes a transmission device set consisting of a first transmission member, a second transmission member, a first interlocking member and a second interlocking member, and pivot shaft set consisting of a first pivot shaft and a second pivot shaft. The arrangement of the transmission device set enables the first pivot shaft and second pivot shaft of the pivot shaft set to be biased synchronously in reversed directions so that the top cover member and bottom base member of the dual-leaf mobile electronic device that are respectively affixed to the first pivot shaft and second pivot shaft of the pivot shaft set can be opened and closed smoothly and stably.

Abstract: A dual-axle hinge structure includes a dual axle assembly, at least one sleeve, and a contactor. The dual axle assembly includes first and second axles that are connected by and mutually push/pull each other through connection members for synchronous rotation. The sleeve is fit over and houses the first and axles. The contactor is arranged between the first and second axles and has two opposite sides respectively in contact engagement with surfaces of the first and second axles. By means of the tight retention achieved with the sleeve and the abutting engagement achieved with the two sides of the contactor, tight engagement is established among the sleeve, the first and second axles, and the contactor to allow for synchronous rotation, in a step-less manner, and positioning of the first axle and the second axle in a tightly retained condition.

Abstract: A dual-axle hinge structure includes a dual axle assembly, at least one sleeve, and a contactor. The dual axle assembly includes first and second axles that are connected by and mutually push/pull each other through connection members for synchronous rotation. The sleeve is fit over and houses the first and axles. The contactor is arranged between the first and second axles and has two opposite sides respectively in contact engagement with surfaces of the first and second axles. By means of the tight retention achieved with the sleeve and the abutting engagement achieved with the two sides of the contactor, tight engagement is established among the sleeve, the first and second axles, and the contactor to allow for synchronous rotation, in a step-less manner, and positioning of the first axle and the second axle in a tightly retained condition.

Abstract: A multiple-stage positioning structure of dual shafts includes a dual shaft assembly, which includes first and second rotary shafts that are connected to each other with coupling members for being rotated synchronously. The first rotary shaft has a curved section and a planar section. Positioning sleeves are fit over the first and the second rotary shafts. Bearing members bear a positioning bar in such a way to have the planar section of the first rotary shaft in contact engagement with a lateral planar section of the positioning bar. When the first rotary shaft is rotated to have the curved section engage the lateral planar section of the positioning bar, an effect of outward expanding and stretching the positioning sleeves is induced. When the first rotary shaft is rotated to have the planar section re-engage the lateral planar section of the positioning bar, an effect of positioning is induced.

Abstract: A synchronized multiple-angle rotatable dual-pivot structure includes a first pivot, a second pivot, a plurality of connection members, and a support frame. The first pivot and the second pivot are each provided with an installation slot. The connection members are of the same length and each has two ends respectively and movably mounted in the installation slots of the first pivot and the second pivot. The support frame has two ends respectively coupled to the first pivot and the second pivot. The connection members are connected between the first pivot and the second pivot so that when one of the first pivot and the second pivot is rotated, forces are induced between the first pivot and the second pivot to mutually pull and push each other so that synchronized rotation can be achieved in an easy and effortless manner and the rotation angle can reach at least 180 degrees.