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A retractable handle assembly for a luggage, handcart and the like comprises a retractable tube having four tubes engaged with each other, three controllers received in the tubes and a tube plug having engagement portion provided at an end of the retractable tube. A handle has a grip portion, an axl

A retractable handle assembly for a luggage, handcart and the like comprises a retractable tube having four tubes engaged with each other, three controllers received in the tubes and a tube plug having engagement portion provided at an end of the retractable tube. A handle has a grip portion, an axle portion and a handle plug having an engagement portion provided at an end of the axle portion. The handle is pivotally coupled with the retractable tube by a shaft. A lock device is movably mounted on the retractable handle assembly. The lock device is moved between a first position, in which the lock device is engaged with both of the engagement portions of the retractable tube and the handle, and a second position, in which the lock device only is engaged with one of the engagement portions of the retractable tube and the handle.

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1. A retractable handle assembly, comprising:a retractable tube including two or more tubes engaged with each other and at least a retraction controller received in the tube, the retraction controller being arranged to lock said tubes at least in an extended position and a retracted position, and to

1. A retractable handle assembly, comprising:a retractable tube including two or more tubes engaged with each other and at least a retraction controller received in the tube, the retraction controller being arranged to lock said tubes at least in an extended position and a retracted position, and to unlock said tubes for relative movement between the extended and retracted positions, wherein a first engagement portion is provided at an end of the retractable tube; a handle having a grip portion arranged to be gripped by a user and an axle portion about which the handle is arranged to rotate relative to retractable tube, wherein a second engagement portion is provided at an end of the axle portion; wherein a lock device is movably mounted on the retractable handle assembly at a junction between the retractable tube and the handle so as to engage both the first and second engagement portions to prevent rotation of said handle, and to disengage one of the first and second engagement portions to permit rotation of the handle relative to the retractable tube; and wherein the lock device is arranged to be moved between a first position, in which the lock device is engaged with both of the first and second engagement portions of the retractable tube and the handle to prevent rotation of the handle relative to said retraction tube, and a second position, in which the lock device only is engaged with one of the first and second engagement portions of the retractable tube and the handle such that the handle is rotated freely relative to the retractable tube. 2. The retractable handle assembly as defined in claim 1, wherein the retractable tube is further provided with a tube plug at a distal end of one of said tubes, the tube plug having the first engagement portion.3. The retractable handle assembly as defined in claim 2, wherein the tube plug has a flange adjacent to the first engagement portion for retaining the lock device in said first position.4. The retractable handle assembly as defined in claim 1, wherein the handle is provided with a handle plug, the handle plug having the second engagement portion.5. The retractable handle assembly as defined in claim 4, wherein the handle plug is provided with a supporting device thereon which a rib is inserted into a slot on the handle plug.6. The retractable handle assembly as defined in claim 1, further comprising a shaft coupling the handle with the retractable tube and serving as an axle of rotation of the handle.7. The retractable handle assembly as defined in claim 6, wherein the shaft has a tunnel in which at least a portion of a transmission device is received and the transmission device has and end thereof connected with the retraction controller, said transmission device enabling a user to cause said retraction controller to unlock said tubes for relative movement.8. The retractable handle assembly as defined in claim 1, further comprising a button provided on the handle and a transmission device having an end thereof connected to the button and the other end thereof to the retraction controller, said transmission device causing said retraction controller to unlock said tubes for relative movement when said button is pressed.9. The retractable handle assembly as defined in claim 8, wherein the transmission device has a first bar having at least a portion received in axle portion of the handle to be coupled with the button, a second bar having at least a portion received in the tube of the retractable tube to be coupled with the retraction controller, and a connector for coupling the first bar with the second bar.10. The retractable handle assembly as defined in claim 9, wherein the connector has a recess in which an end of the second bar is rested.11. The retractable handle assembly as defined in claim 1, wherein the handle is provided with a soft piece at the grip portion.12. The retractable handle assembly as defined in claim 1, wherein the first and second engagement portions of the retractable tube and the handle are non-rounded in cross-sections and the lock device has a corresponding shape.13. The retractable handle assembly as defined in claim 1, wherein the handle has a recess at a top of the axle portion, a chamber at a bottom of the axle portion, a hole communicated with the recess and the chamber, a button rested in the recess, a spring urging the button and a rod having a midsection thereof received in the hole, a top end connected with the button and a bottom end received in the chamber.14. The retractable handle assembly as defined in claim 13, wherein the rod has a driving device received in the chamber by which a transmission device is driven upon pressing the button to activate the retraction controller and thereby unlock said tubes for relative movement.15. A luggage, comprising:a case; two wheel assemblies pivotally mounted on the case, and a single-tube retractable handle assembly mounted on the case; wherein the retractable handle assembly comprises: a retractable tube including two or more tubes engaged with each other and at least a retraction controller received in the tube, the retraction controller being arranged to lock said tubes in at least an extended position and a retracted position and to unlock said tubes for relative movement between the extended and retracted positions, wherein a first engagement portion is provided at an end of the retractable tube; a handle having a grip portion arranged to be gripped by a user and an axle portion about which the handle is arranged to rotate relative to retractable tube, wherein a second engagement portion is provided at an end of the axle portion; wherein a lock device is movably mounted on the retractable handle assembly at a junction between the retractable tube and the handle so as to engage both the first and second engagement portions to prevent rotation of said handle, and to disengage one of the first and second engagement portions to permit rotation of the handle relative to the retractable tube; and wherein the lock device is arranged to be moved between a first position, in which the lock device is engaged with both of the first and second engagement portions of the retractable tube and the handle to prevent rotation of the handle relative to said retraction tube, and a second position, in which the lock device only is engaged with one of the first and second engagement portions of the retractable tube and the handle such that the handle is rotated freely relative to the retractable tube.