referring to fig1 , a rotation - controllable rotary grip assembly in accordance with the present invention is shown comprised of a shaft 1 , a grip 2 , a spring member 3 , and a lock 4 . referring to fig2 and 3 and fig1 again , the shaft 1 comprises a locating means , for example , a locating hole 11 on its one end , and two extension rods 12 respectively and axially extending from its two opposite ends . the extension rods 12 each have at least one , for example two planes 121 , and a mounting hole 13 cut through the planes 121 . further , a locating block 14 is respectively attached to one plane 121 of each of the extension rods 12 . by means of the mounting holes 13 of the extension rods 12 and the locating blocks 14 , the shaft 1 is fastened to a handle 51 of a luggage 5 ( see also fig1 ). referring to fig1 again , the grip 2 is shaped like a barrel , having an axial hole 21 axially extending through its two distal ends and coupled to the shaft 1 for allowing turning of the grip 2 about the shaft 1 , a locating means , for example , a locating groove 22 on its first end , an end recess 211 formed on the first end around the axial hole 21 , and a recessed hole 23 on its second end . the locating groove 22 is axially formed on the first end of the grip 2 and abutted to the border of the end recess 211 . further , two end plates 24 are respectively fastened to the first and second ends of the grip 2 with screws 243 . one end plate 24 has a first through hole 241 and a second through hole 242 respectively aligned with the axial hole 21 and recessed hole 23 of the grip 2 . the first through hole 241 has a diameter fitting the outer diameter of the extension rods 12 of the shaft 1 . after installation of the end plates 24 , the grip 2 is secured to the shaft 1 and prohibited from axial displacement relative to the shaft 1 . referring to fig5 and 6 and fig1 again , the spring member 3 is a spiral torsion spring sleeved onto the shaft 1 and received in the end groove 211 of the grip 2 , having a first end terminating in a first pin 31 that is fastened to the locating hole 11 of the shaft 1 and a second end terminating a second pin 32 that is fastened to the locating groove 22 ( see fig5 and 6 ). when rotating the grip 2 relative to the shaft 1 , the spring member 3 is compressed . when released the hand from the grip 2 after rotation , the spring force of the spring member 3 immediately reverses the grip 2 relative to the shaft 1 to its former position . referring to fig4 and fig1 ˜ 3 again , the lock 4 is comprised of a latch 41 , a positioning member 42 , and a spring 43 . the latch 41 is mounted in the handle 51 adjacent to the recessed hole 23 of the grip 2 and slidable toward and away from the recessed hole 23 . the latch 41 has a base 411 , a first top groove 412 and a second top groove 412 ′ on the top side of the base 411 , a l - shaped guide plate 413 disposed at the bottom side of the base 411 and slidably coupled to the associating end plate 14 , a finger rod 414 extending from the guide plate 413 , and a latch pin 415 extending from the base 411 for engaging the recessed hole 23 of the grip 2 to stop the grip 2 from rotation relative to the shaft 1 . the positioning member 42 is a steel ball selectively set in the first top groove 412 or second top groove 412 ′ on the top side of the base 411 to hold down the latch 41 in one of two positions , namely , the locking position where the latch pin 415 is engaged into the recessed hole 23 and the unlocking position where the latch pin 415 is disengaged from the recessed hole 23 . the spring 43 is a compression spring pressed on the steel ball 42 to hold the steel ball 42 in the first top groove 412 or second top groove 412 ′. referring to fig6 and 10 , when the shaft 1 , the grip 2 , the spring member 3 and the lock 4 are assembled , the rotation - controllable rotary grip assembly is installed in ( the forked top end of ) the handle 51 of the luggage 5 . after installation of the rotation - controllable rotary grip assembly in the handle 51 , the shaft 1 is fixedly secured to the handle 51 and prohibited from rotation relative to the handle 51 , and the user can control the lock 4 to lock or unlock the grip 2 . referring to fig6 and 7 , when the user pulled the latch 41 outwards to have the steel ball 42 be positioned in the first top groove 412 , the latch pin 415 is disengaged from the recessed hole 23 of the grip 2 and the second through hole 242 of the associating end plate 24 , the grip 2 is turnable about the shaft 1 in one direction . when the user holds the grip 2 of the rotation - controllable rotary grip assembly with the hand to pull the luggage 5 ( see fig1 ), the luggage 5 and the handle 51 are tilted , and at the same time the grip 2 is turned about the shaft 1 through an angle to fit the tilting action of the luggage 5 and the handle 51 . when moving over an uneven floor or road surface , the grip 2 is turned about the shaft 1 alternatively forwards and backwards to eliminate shocks . therefore , the user can carry the luggage 5 comfortably with less effort when walking . referring to fig8 and 9 , when the user pushes the latch 41 of the lock 4 forwards to have the steel ball 42 be positioned in the second top groove 412 ′, the latch pin 415 is engaged into the recessed hole 23 of the grip 2 and the second through hole 242 of the associating end plate 24 to lock the grip 2 , prohibiting the grip 2 from rotary motion relative to the shaft . as stated above , the rotation - controllable rotary grip assembly allows the user to lock or unlock the grip 2 . when the grip 2 is locked , it is prohibited from rotary motion relative to the shaft 1 . on the contrary , when the grip 2 is unlocked , the grip 2 is turnable about the shaft 1 . during rotation of the grip 2 relative to the shaft 1 , the grip 2 is kept in balance , and will not deviate from the position , i . e ., the invention eliminates the drawback of the prior art ep0548708a1 . although particular embodiments of the invention have been described in detail for purposes of illustration , various modifications and enhancements may be made without departing from the spirit and scope of the invention . accordingly , the invention is not to be limited except as by the appended claims .
a rotation - controllable rotary grip assembly includes a shaft affixed to a retractable handle of a luggage , a barrel - like grip sleeved onto and turntable about the shaft , a spring member sleeved onto one extension rod at one end of the shaft and connected between the shaft and the grip for returning the grip to its former position after a rotary motion of the grip relative to the shaft , and a lock for locking the grip to the shaft to prohibit rotation of the grip relative to the shaft .