초록 ▼

A two-stage expansion/collapse control mechanism is provided for use on a hand-trailable luggage case having an auxiliary wheel unit, which allows the auxiliary wheel unit to be expanded for use to support the luggage case when the extendable handle of the luggage case is being extended for use, and

A two-stage expansion/collapse control mechanism is provided for use on a hand-trailable luggage case having an auxiliary wheel unit, which allows the auxiliary wheel unit to be expanded for use to support the luggage case when the extendable handle of the luggage case is being extended for use, and also allows the auxiliary wheel unit to be collapsed into the luggage case when the extendable handle is being pushed back into the luggage case.

대표청구항 ▼

[ What is claimed is:] [1.] A two-stage expansion/collapse control mechanism for use on a hand-trailable luggage case having a main wheel unit and an auxiliary wheel unit, the control mechanism comprising:an extendable frame provided on said luggage case, which includes an inner tube and an outer tu

[ What is claimed is:] [1.] A two-stage expansion/collapse control mechanism for use on a hand-trailable luggage case having a main wheel unit and an auxiliary wheel unit, the control mechanism comprising:an extendable frame provided on said luggage case, which includes an inner tube and an outer tube;a handle provided on the extendable frame, the handle having a button;a first locking device provided in the extendable frame;a second locking device provided at a bottom of the extendable frame;a first rigid pull-push device operatively coupled to the first locking device;a second rigid pull-push device operatively coupled to the second locking device; and,a pulling device coupled to a bottom of the inner tube for use in conjunction with the second locking device coupled to the second rigid pull-push device to control expansion/collapse of the auxiliary wheel unit;wherein when the button is pressed down for first-stage control, the first rigid pull-push device is lifted to pull the first locking device, allowing the inner tube to be extended out of the outer tube to a predetermined position; and when the button is pressed for second-stage control when the inner tube is in the predetermined position, the first locking device is further unlocked and is lifted to pull the second rigid pull-push device, allowing the second locking device to be unlocked.