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A retractable luggage handle assembly includes a base unit consisting of two outer sleeves, a retractable handle consisting of two retractable bars, two actuation members and a grip and mounted in the base unit and movable relative to the base unit between an extended position and a received positio

A retractable luggage handle assembly includes a base unit consisting of two outer sleeves, a retractable handle consisting of two retractable bars, two actuation members and a grip and mounted in the base unit and movable relative to the base unit between an extended position and a received position, and a pullback and buffer unit consisting of two rails, two sliding blocks, two movable member sets, two spring-loaded guide members, two buffers, and two locating caps and adapted for pulling the retractable bars back to the inside of the outer sleeves of the base unit and moving the buffers to buffer the movement of the sliding blocks when the user operates a control button at the grip to receive the retractable handle.

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1. A retractable luggage handle assembly, comprising: a base unit comprising two outer sleeves arranged in parallel, each said outer sleeve comprising an axial receiving hole axially extending through opposing top and bottom ends thereof, a first sliding slot longitudinally cut through the periphery

1. A retractable luggage handle assembly, comprising: a base unit comprising two outer sleeves arranged in parallel, each said outer sleeve comprising an axial receiving hole axially extending through opposing top and bottom ends thereof, a first sliding slot longitudinally cut through the periphery thereof and disposed in communication with said axial receiving hole, and a first locating hole perpendicularly extended from a top end of said first sliding slot and defining a first arched edge;a retractable handle mounted in said base unit and controllable to move between an extended position and a received position with respect to said base unit, said retractable handle comprising two retractable bars, two actuation members respectively mounted at respective bottom ends of said retractable bars, and a grip connected between opposing top ends of said retractable bars, each said actuation member comprising a second sliding slot longitudinally cut through the periphery thereof and a second locating hole perpendicularly extended from a top end of said second sliding slot and defining a second arched edge; anda pullback and buffer unit having two sliding blocks, adapted for respectively pulling said retractable bars back to the inside of said outer sleeves of said base unit and buffering the movement of said sliding blocks when a person operates a control button of said grip and move said grip to receive said retractable handle from said extended position to said received position, said pullback and buffer unit comprising two rails respectively attached to said outer sleeves of said base unit, two sliding blocks, each said rail comprising a longitudinal sliding groove and a longitudinal positioning groove, said two sliding blocks respectively slidably mounted in said longitudinal sliding grooves of said rails, each said sliding block comprising a retaining open chamber transversely disposed near a bottom side thereof, two movable member sets respectively mounted in said retaining open chambers of said sliding blocks, each said movable member set comprising an engagement rod insertable into the first sliding slot of one respective said outer sleeve and the second locating hole of one respective said actuation member and an elastic member stopped against an inside wall of the retaining open chamber of the associating said sliding block, two spring-loaded guide members respectively mounted in said longitudinal sliding grooves of said rails and two buffers respectively mounted in said longitudinal positioning grooves of said rails and adapted for buffering the movement of said sliding blocks. 2. The retractable luggage handle assembly as claimed in claim 1, wherein each said retractable bar comprises an outer tube, an inner tube movable in and out of said outer tube, and a positioning member affixed to a bottom end of said inner tube and inserted with said inner tube into said outer tube; said grip is connected between opposing top ends of said inner tubes of said retractable bars. 3. The retractable luggage handle assembly as claimed in claim 2, wherein said outer tube of each said retractable bar comprises an axial passage hole axially extending through opposing top and bottom ends thereof, and two positioning holes respectively transversely disposed near opposing top and bottom ends in communication with said axial passage hole; the positioning member of each said retractable bar comprises a first spring-loaded engaging member selectively and disengageably engaged into one of the two positioning holes of the associating said outer tube to lock the respective said inner tube to the associating said outer tube in said extended position or said received position; said two actuation members are respectively mounted at the bottom ends of said outer tubes of said retractable bars; each said actuation member further comprises a second spring-loaded engaging member extending out of the periphery opposite to said second sliding slot and stopped against an inside wall of one respective said outer sleeve; said grip comprises a control button operable to move said first spring-loaded engaging members and said second spring-loaded engaging members. 4. The retractable luggage handle assembly as claimed in claim 1, wherein each said sliding block further comprises a position-limit passage vertically upwardly extended from said retaining open chamber to a top wall thereof; each said spring-loaded guide member comprises a guide rod mounted in the position-limit passage of one said sliding block, and a spring member mounted around said guide rod and stopped against one said sliding block. 5. The retractable luggage handle assembly as claimed in claim 1, wherein each said sliding block further comprises a locating hole disposed above the retaining open chamber thereof; each said longitudinal positioning groove longitudinally disposed in alignment with the longitudinal sliding groove thereof; each said buffer comprise a cylinder filled with a hydraulic fluid and mounted in the longitudinal positioning groove of one said rail, a plunger movable in and out of said cylinder and insertable into the longitudinal sliding groove of the associating said rail, and a locating block located at a distal end of said plunger outside said cylinder and fastened to the locating hole of one respective said sliding block. 6. The retractable luggage handle assembly as claimed in claim 1, wherein said pullback and buffer unit further comprises two locating caps respectively mounted around said outer sleeves of said base unit and capped on respective top ends of said rails, each said locating cap comprising a coupling hole cut through opposing top and bottom sides thereof and coupled to the associating said outer sleeve of said base unit and a bottom mounting hole fastened to the top end of one respective said rail. 7. The retractable luggage handle assembly as claimed in claim 1, wherein each said sliding block further comprises two position-limit grooves respectively located in opposing top and bottom sides in the retaining open chamber thereof; each said sliding block further comprises a stop block located at one end of the engagement rod thereof and positioned in the position-limit grooves of the associating said sliding block, a protruding block extended from one lateral side of the engagement rod thereof and suspending in said retaining open chamber of the associating said sliding block, and said elastic member mounted on said protruding block and stopped against an inside wall of the retaining open chamber of the associating said sliding block.