BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a top tube adaptor which is applied to auxiliarily fix a bicycle on a bicycle carrier of a car.

Description of the Prior Art

A conventional top tube adaptor10is applied to fix a bicycle B0on a bicycle carrier of a car A0. The conventional top tube adaptor10contains a first tube101, a locking hook102extending from an end of the conventional top tube adaptor10, a second tube103movably expanded and retracted on an outer wall of the first tube101, and another locking hook102connected with an end of the second tube103. However, the second tube103cannot be fixed with respect to the first tube101after being expended or retracted, and the two locking hooks102cannot be closed, thus falling the bicycle from the car A0easily, as shown inFIG. 1.

To solve above-mentioned problem, a slot104is defined on the first tube101, and the second tube103has a positioning bolt105accommodated in the slot104, but the slot104and the positioning bolt105cannot fix the first tube101and the second tube103, as shown inFIGS. 2, 2-1, 2-2, 3, and4.

In addition, a retainer106is mounted between the first tube101and the second tube103to control a rotary knob107to open and close a respective looking hook102, as illustrated inFIGS. 2, 2-1, 2-2, 4, and 5. Nevertheless, a drive sheet1061of the retainer106is too rigid to operate it easily, thus having operational inconvenience, as illustrated inFIGS. 2, 2-1, 2-2, and4.

The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a top tube adaptor which contains a coupling projection rotatably connected with two tabs and closing a cutout, at least one positioning rack, a respective positioning rack having multiple teeth, a locking seat rotatably connected with a rotatable connector, the rotatable connector having an orientation segment extending into at least one slot, and an engagement portion formed on an inner side of the orientation segment and retained with one of the multiple teeth.

To achieve above-mentioned objective, a top tube adaptor provided by the present invention contains: a body, two fixers connected with two ends of the body respectively, and a slidable rod fitted with one of the two fixers.

The body includes at least one slot defined on an outer wall thereof and configured to accommodate at least one positioning rack, and a respective positioning rack has multiple teeth.

The slidable rod includes a channel configured to slide the slidable rod along the body, and the slidable rod includes a locking seat rotatably connected with an end of the slidable rod and accommodating a rotatable connector. The rotatable connector includes two shafts rotatably connected with two sides of a middle section of the rotatable connector respectively, a press portion extending from a first end of the rotatable connector, a button extending from the press portion, an orientation segment extending into the at least one slot from a second end of the rotatable connector, an engagement portion formed on an inner side of the orientation segment and retained with one of the multiple teeth, and a first resilient element abutting against an inner side of the orientation segment and fixed in the locking seat.

A respective fixer includes a curved hook extending from an end thereof, a cutout defined between the end of the respective fixer and the curved hook, two tabs located beside the cutout away from the curved hook, a coupling projection rotatably connected with the two tabs and closing the cutout, a column inserted through the two tabs, and a second resilient element fitted on the column. The second resilient element has two abutting segments, one of the two abutting segments abuts against the two tabs, and the other abutting segment contacts with or removes from the coupling projection so as to close or open the cutout.

The two fixers are connected with two ends of the slidable rod respectively.

Preferably, the respective fixer further includes a locating member configured to connect with the body and an abutting section formed on the locating member. The locating member has the curved hook curvedly extending from the body, and the curved hook has a distal segment straightly extending to the cutout, the curved hook also has a tilted contact face formed on an edge of the distal segment facing the cutout. The abutting section has a slanted extension extending to the cutout, and the abutting section has the two tabs formed on a distal end thereof, the coupling projection is rotatably connected between the two tabs to close the cutout, and the coupling projection has a connection knob extending from an end thereof and rotatably connected with the two tabs by ways of the column. The connection knob has a receiving orifice configured to accommodate the column on which the second resilient element is fitted, the one abutting segment abuts against the receiving orifice, and the other abutting segment contacts with the connection knob so as to close the cutout. The coupling projection further has a beveled biasing face formed on the other end thereof opposite to the connection knob and configured to contact with the tilted contact face.

Preferably, a respective tooth has a first retaining face perpendicular to a bottom of the positioning rack and has a first sliding face connected with the push face. The engagement portion of the orientation segment has a second retaining face for engaging with the first retaining face, and the engagement portion has a second sliding face for engaging with the first sliding face.

Preferably, the body includes the at least one slot defined on an outer wall thereof and configured to accommodate the at least one positioning rack, and the respective positioning rack has the multiple teeth. The slidable rod includes a recess defined the end thereof adjacent to the rotatable connector and includes a first fixing orifice beside the recess, the locking seat includes a first fringe fitted with the slidable rod adjacent to the first fixing orifice, a second fringe contacting with the slidable rod and opposite to the first fringe, a chamber corresponding to the recess, and a second fixing orifice corresponding to the first fixing orifice. The chamber matches with the recess and accommodates the rotatable connector, the chamber has a third fixing orifice configured to accommodate a shank and has a fourth fixing orifice located proximate to the second fringe so that the button extends out of the fourth fixing orifice. A defining member is inserted through the first fixing orifice and the second fixing orifice, and the defining member includes a first part and a second part. The first part has a first head extending into the at least one slot, a peg extending outward from the first head and inserted into the first fixing orifice and the second fixing orifice, and a threaded orifice defined in the first peg. The second part has a second head and has a screwing stem extending outward from the second head and screwed with the threaded orifice, such that the first fringe and the slidable rod are fixed between the first and the second head. The rotatable connector includes the orientation segment extending into the at least one slot from the second end thereof, the orientation segment has the engagement portion formed on the inner side thereof and retained with the one tooth, and the first resilient element abuts against the orientation segment and is fixed in the chamber.

