Foldable frame assembly for a bicycle

Claim 1

A foldable frame assembly for a bicycle, including a first frame member, a second frame member, a pivot member with a first axis, the pivot member interconnecting pivotally proximate end portions of the first and second frame members to permit relative movement between the first and second frame members from a folded position to an unfolded position, and a fastening device mounted on the first and second frame members and operable so as to retain the first and second frame members in the unfolded position, characterized in that: the proximate end portions of the first and second frame members are formed with first and second recesses, respectively, the first and second recesses having a respective recess bottom and cooperatively forming an accommodating space that extends in a longitudinal direction transverse to the first axis of the pivot member; and the fastening device is mounted in the accommodating space, and includes a hooking seat having a mounting section mounted securely on the recess bottom of the first recess, and a hooking section extending from the mounting section into the first recess, a pivot seat mounted securely on the recess bottom of the second recess, an elongated handle member having an operating portion and a connecting portion on one of the operating portion, the connecting portion having first and second pivot units, the first pivot unit being mounted pivotally on the pivot seat about a second axis transverse to the longitudinal direction such that the handle member is pivotable between a locking position, where the operating portion of the handle member is disposed in the second recess, and a releasing position, where the operating portion extends outwardly of the second recess, a connecting rod having a pivot section pivoted to the second pivot unit about a third axis parallel to the second axis, and a distal section extending from the pivot section toward the first recess, and a hook member having a coupling portion coupled to the distal section of the connecting rod, and a hooking portion extending from the coupling portion for engaging the hooking section of the hooking seat such that, when the hooking portion engages the hooking section, movement of the handle member from the releasing position to the locking position will result in a pulling force on the connecting rod to engage firmly the hooking portion with the hooking section and retain securely the first and second frame members in the unfolded position.