Positioning structure of retractable draw bar for a suitcase

Details Positioning structure of retractable draw bar for a suitcase Positioning structure of retractable draw bar for a suitcase

2000-06-21

2001-09-25

Mah, Chuck Y. (Department: 3626)

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Handle, handle component, or handle adjunct

Length adjustable pull handle for luggage or luggage cart

C016S429000, C016SDIG004, C403S326000

Reexamination Certificate

active

06292979

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a positioning structure of a retractable draw bar for a suitcase and, more particularly, to a positioning structure of a retractable draw bar letting the joining of a first joint tube and a positioning seat be steadier. The present invention also has the advantage that the retaining button of the positioning seat will not break or be damaged so that the lifetime can be greatly increased.
BACKGROUND OF THE INVENTION
For a suitcase
11
a
shown in
FIG. 1
with rollers
10
a
installed at the bottom thereof, there is a retractable draw bar
12
a
allocated to facilitate the protraction/retraction of a pull handle
13
a
so that the pull handle
13
a
can be pulled out to a full extent to be gripped conveniently when used and be retracted to a compact position when not used.
As shown in
FIGS. 2 and 3
, the retractable draw bar
12
a
comprises basically a first joint tube
14
a
, a second joint tube
15
a
, and a positioning seat
16
a
. The caliber of the first joint tube
14
a
is slightly larger than that of the second joint tube
15
a
so that the second joint tube
15
a
can be retractably inserted therein. Two circular retaining holes
18
a
are respectively disposed on two opposite tube walls near an upper opening
17
a
of the first joint tube
14
a
. The positioning seat
16
a
is sheathed in the upper opening
17
a
of the first joint tube
14
a
. Two circular retaining buttons
19
a
are respectively formed on two opposite sides of the positioning seat
16
a
. The positioning seat
16
a
can be joined at the upper opening
17
a
through the fastening of the retaining buttons
19
a
in the retaining holes
18
a
. A fixing element
20
a
can be fixed in the lower opening of the second joint tube
15
a
. When the second joint tube
15
a
is pulled upwards in the first joint tube
14
a
until the fixing element
20
a
sticks to the positioning seat
16
a
, the second joint tube
15
a
can be positioned there so that it will not slide out of the first joint tube
14
a.
However, in the above positioning structure of a retractable draw bar in prior art, the positioning seat
16
a
and the first joint tube
14
a
are joined through the fastening of the retaining buttons
19
a
in the retaining holes
18
a
. When the second joint tube
15
a
is pulled upwards, the positioning seat
16
a
will bear an upward force. The retaining buttons
19
a
and the retaining holes
18
a
will bear this force via the upper edges thereof. Because the contact area of the upper edges of the retaining buttons
19
a
and the retaining holes
18
a
is very small, the retaining buttons
19
a
will easily break or be damaged because of large pressure. Therefore, the positioning seat
16
a
can not be steadily joined at the upper opening
17
a
of the first joint tube
14
a
so that the positioning seat
16
a
can not achieve its original positioning function.
SUMMARY AND OBJECTS OF THE PRESENT INVENTION
The primary object of the present invention is to provide a positioning structure of a retractable draw bar, wherein the contact area of the retaining buttons and the retaining holes can be increased so that the retaining buttons can bear larger load when the positioning seat bears an upward force. Thereby, the retaining buttons will not break or be damaged because of large shearing force. The positioning seat thus can be steadily joined at the upper opening of the first joint tube to achieve its positioning function.
To achieve the above object, the present invention provides a positioning structure of a retractable draw bar, which comprises at least a first joint tube and a positioning seat. Two retaining holes are respectively disposed at two opposite tube walls near an upper opening of the first joint tube. An extended plate raised on the inner wall of the first joint tube is formed at the upper edge of each retaining hole. Two retaining buttons are respectively formed on two opposite sides of the positioning seat. The positioning seat is sheathed in the upper opening of the first joint tube. The positioning seat is joined at the upper opening of the first joint tube through the fastening of the retaining buttons in the retaining holes with the extended sheets situated above the retaining buttons of the positioning seat.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawings, in which:


REFERENCES:
patent: 5653000 (1997-08-01), ILee
patent: 5890257 (1999-04-01), Edele et al.
patent: 6202254 (2001-03-01), Ezer

Affiliated with

Also associated with

Rating

Positioning structure of retractable draw bar for a suitcase does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Positioning structure of retractable draw bar for a suitcase, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Positioning structure of retractable draw bar for a suitcase will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2472728