Rotating shaft structure with easy opening and heavy closing and cam structure thereof

Abstract

The invention relates to a rotating shaft structure with easy opening and heavy closing and a cam structure thereof; the rotating shaft structure comprises a mandrel, and a pin-jointing base, a first cam, a second cam, an elastic element and a packing element which are sequentially sheathed on the mandrel; the cam structure comprises a first cam and a second cam which rotate relatively, at least one cam is arranged at one side surface of the first cam, the second cam is connected with a bumping block of the first cam by an inclined contact surface, the contact surface comprises at least one group of curve surfaces and a concave part for connecting the curve surfaces, the distance from the curve surface to the central shaft of the second cam is gradually increased along the direction of the concave part, so as to lead the second cam to gradually compress the elastic element in a laterally-moving way when the bumping block rotates along the curve surface, the torque force is gradually increased, the cover is closed heavier by heavier, an automatic locking-out state is formed when at the concave part; when the bumping block rotates reversely, the cover is opened by easier by easier along with the distance which is shortened gradually, so as to achieve the purposes of easy opening and heavy closing.

Description

technical field [0001] The invention relates to a rotating shaft structure, in particular to a rotating shaft structure that realizes switching of light and weight by means of a cam. Background technique [0002] It is generally used for the hinge of flip-top electronic products, so that the cover can be opened or closed relative to the main body. The known rotating shaft structure usually achieves the function of automatic locking when the cover and the body are closed by means of two relatively rotatable cams, such as the new patent of the Republic of China Announcement No. M296586 owned by the applicant in this case "with automatic locking As shown in "rotating shaft structure", it combines a set of cam members on the rotating shaft, wherein the cam members are formed by butt joints of a fixing part and a sliding part, so that it has the effect of automatic closing. [0003] However, the above-mentioned cam structure only has the function of locking. When leaving the loc...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a rotating shaft structure for light opening and heavy closing to solve the problem that when the cover is closed, it will automatically fall and hit the main body due to its own weight, and to make it easier and labor-saving when the cover is opened

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