A hinge (200) is provided in connection with a mobile phone. The hinge includes a shaft (21), a cam (22), a sleeve (25), a torsion spring (24) and a compression spring (23). The shaft includes a first end with two rotatable blocks (211) formed thereon and a second opposite end. The cam includes a fi
A hinge (200) is provided in connection with a mobile phone. The hinge includes a shaft (21), a cam (22), a sleeve (25), a torsion spring (24) and a compression spring (23). The shaft includes a first end with two rotatable blocks (211) formed thereon and a second opposite end. The cam includes a first cam end having a flat surface (2230), an intermediate portion (221), a second cam end. The cam surrounds the shaft with the rotatable blocks abutting against the flat surface and being rotatable relative to the cam. The sleeve includes a first end engaged with the second cam end of the cam, and a second end abutting the second end of the shaft. The torsion spring has an inner finger (242) coupled to the shaft, and an outer finger (241) coupled to the sleeve. The compression spring surrounds the intermediate portion of the cam.
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What is claimed is: 1. A hinge, comprising: a shaft comprising a first end and an opposite second end, two opposite shaft rotating blocks radially projecting from the first end; a cam comprising a first cam end including a first end surface and two opposite cam blocks axially projecting form the fi
What is claimed is: 1. A hinge, comprising: a shaft comprising a first end and an opposite second end, two opposite shaft rotating blocks radially projecting from the first end; a cam comprising a first cam end including a first end surface and two opposite cam blocks axially projecting form the first end surface and being symmetric about a center of the first end surface, an opposite second cam end, an intermediate portion connecting both with the first and second cam end, and an axial through hole defined through the cam; the cam surrounding the first end of the shaft with the shaft rotating blocks abutting against the first cam end surface and being rotatable relative to the cam between the cam blocks; a sleeve surrounding the shaft, and comprising a first end surrounding and engaged with the second cam end of the cam such that the sleeve is axially slidable relative to and rotatable jointly with the cam, and a second end abutting the second end of the shaft; a torsion spring having a first finger coupled to the shaft, and a second finger coupled to the sleeve, the torsion spring surrounding the second end of the shaft and being received in the sleeve; and an elastic member surrounding the intermediate portion of the cam and elastically interposed between the first end of the cam and the first end of the sleeve. 2. The binge as claimed in claim 1, wherein the shaft comprising a locking portion at the first end thereof, and the locking portion is configured for drive the shaft move jointly with a main body of a portable electronic device. 3. The hinge as claimed in claim 2, further comprising a clip, wherein the shaft defines a groove at the second end thereof, the groove engageably receiving the clip therein. 4. The hinge as claimed in claim 1, wherein each of the cam blocks comprises an upright side surface, a slanted curved surface opposite from the upright side surface, and a step surface formed on the slanted curved surface adjacent an apex of the block. 5. The hinge as claimed in claim 1, wherein the second end of the cam comprises a plurality of positioning blocks spaced apart on a periphery thereof, and the first end of the sleeve comprises a plurality of protrusions interleavedly engaged with the positioning blocks. 6. The hinge as claimed in claim 1, wherein an elastic member is a compression spring, and is configured for providing an elastic force for axially sliding the sleeve relative to the cam. 7. A mobile phone assembly, comprising: a main body; a shaft comprising a first end with two opposite shaft rotating blocks radially projecting therefrom and a second opposite end, the first end of the shaft secured to the main body; a cam comprising a first cam end including a first end surface and two opposite cam blocks axially projecting from the first end surface and being symmetric about a center of the first end surface, a second opposite cam end, an intermediate portion connecting both with the first and second cam ends and an axial through hole define through the cam; the cam surrounding the first end of the shaft with the shaft rotating blocks abutting against the first cam end surface and being rotatable relative to the cam between the cam blocks; a sleeve surrounding the shaft, and comprising a first end surrounding and engaged with the second cam end of the cam such tat the sleeve is axially slidable relative to and rotatable jointly with the cam, and a second end abutting against the second end of the shaft; a cover secured to the second end of the sleeve; a torsion spring having a first finger coupled to the shaft, and a second finger coupled to the sleeve, the torsion spring surrounding a portion adjacent the second end of the shaft and being received in the sleeve; and an elastic member surrounding the intermediate portion of the earn and springably interposed between the first end of the cam and the first end of the sleeve. 8. The mobile phone assembly as claimed in claim 7, wherein the shaft comprises a first locking portion at the first end thereof, the first locking portion being securely coupled to the main body. 9. The mobile phone assembly as claimed in claim 8, wherein the second end of the sleeve comprises a second locking portion securely coupled to the cover. 10. The mobile phone assembly as claimed in claim 7, further comprising a clip, wherein the shaft defines a groove at the second end thereof, the groove engageably receiving the clip therein. 11. The mobile phone assembly as claimed in claim 10, wherein the clip is C-shaped. 12. The mobile phone assembly as claimed in claim 7, wherein each of the cam blocks comprises an upright side surface, a slanted curved surface opposite from the upright side surface, and a step surface formed on the slanted curved surface adjacent an apex of the block. 13. The mobile phone assembly as claimed in claim 7, wherein the second end of the cam comprises a plurality of positioning blocks spaced apart on a periphery thereof, and the first end of the sleeve comprises a plurality of protrusions interleavedly engaged with the positioning blocks. 14. The mobile phone assembly as claimed in claim 7, wherein an elastic member is a compression spring, and is configured for providing an elastic force for axially sliding the sleeve relative to the cam. 15. An electronic device comprising: a main body enclosing a part of said electronic device; a cover disposed next to said main body and enclosing another part of said electronic device; and a hinge mechanism disposed between said main body and said cover so as to interconnect said cover with said main body and allow said cover movable relative to said main body about said hinge mechanism, said hinge mechanism comprising a block formed with a shaft to be movable together with said main body by said shaft, and a cam movable together with said cover and attachable to a sleeve enclosing a part of said shaft, said block being engagable with said cam so as to conduct movement of said cam and said cover, at least two resilient members disposed respectively beside at least one of said cam and said block so that one of said at least two resilient members is installed around said cam and engagable with said sleeve by at least one protrusion axially projecting from said sleeve and extending against said cam and controls axial movement of said at least one of said cam and said block, and another of said at least two resilient members controls rotary movement of another of said cam and said block and is attachable to said cam so as to be movable together with said cover by said sleeve. 16. The electronic device as claimed in claim 15, wherein said one of said at least two resilient members is a compression spring and said another of said at least two resilient members is a torsion spring.
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