Abstract: A hinge includes a base receiving a coupling device detachably mounted onto a mounting seat. An outer resilient plate includes an end pivotably mounted onto the base. A fixed seat is pivotably mounted onto the other end of the outer resilient plate. A buffer device includes a connecting member, a buffer, and an inner resilient plate. Each of a first pivot hole of the connecting member, an end of the buffer, and an end of the inner resilient plate is pivotably mounted onto the base. The other end of the buffer is pivotably mounted onto a second pivot hole of the connecting member. The other end of the inner resilient plate is slideably mounted onto an arcuate slot of the connecting member. The inner resilient plate further includes a fulcrum pivot hole intermediate the ends thereof. The fulcrum pivot hole is pivotably mounted by a pivot to the base.

Abstract: A hinge includes a base receiving a coupling device detachably mounted onto a mounting seat. An outer resilient plate includes an end pivotably mounted onto the base. A fixed seat is pivotably mounted onto the other end of the outer resilient plate. A buffer device includes a connecting member, a buffer, and an inner resilient plate. Each of a first pivot hole of the connecting member, an end of the buffer, and an end of the inner resilient plate is pivotably mounted onto the base. The other end of the buffer is pivotably mounted onto a second pivot hole of the connecting member. The other end of the inner resilient plate is slideably mounted onto an arcuate slot of the connecting member. The inner resilient plate further includes a fulcrum pivot hole in at intermediate portion thereof. The fulcrum pivot hole is pivotably mounted by a pivot to the base.

Abstract: A track device comprises a first track and a second track slidably received in the first track. An engaging member is mounted to an end of the first rack and includes at least one positioning block. The second track further includes two hooks for engaging with two ends of a pressing member mounted to the second track. The pressing member includes a protruded portion that can be pressed. The pressing member further includes at least one notch defined by two parallel walls. When the second track is pulled outward along a longitudinal direction, the notch is engaged with the positioning block of the engaging member of the first track, thereby providing a better positioning effect. When the protruded portion of the pressing member is pressed, the notch is disengaged from the positioning block, thereby allowing disengagement or engagement of the second track from or into the first track.