US20100276242A1

US20100276242A1 - Wheeled suitcase having dual extractable handle assemblies

Info

Publication number: US20100276242A1
Application number: US12/387,344
Authority: US
Inventors: Ue-Ming Yang
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-04
Filing date: 2009-05-04
Publication date: 2010-11-04

Abstract

A wheeled suitcase has dual extractable handle assemblies. The first extractable handle assembly is positioned immediately adjacent to the rear side of wheeled suitcase for pulling and wheeling the wheeled suitcase in inclined position. The second extractable handle assembly is positioned immediately adjacent to the bottom side of wheeled suitcase for loading an add-on traveling case.

Description

BACKGROUND OF THE INVENTION

Present invention relates to a wheeled suitcase having dual extractable handle assemblies. The first extractable handle assembly is used for pulling and wheeling the suitcase in inclined position, and the second extractable handle assembly is used for loading an add-on traveling case.
In prior art, a wheeled suitcase is provided with an extractable handle assembly for pulling/wheeling the suitcase. When user desires to carry an add-on traveling case on the wheeled suitcase, he or she may place the add-on traveling case on top side of wheeled suitcase (FIG. 1). When user pulls/wheels the suitcase in inclined position, the add-on case is supported by the extracted bars of handle assembly (FIG. 2). User often needs to tie the add-on case to the extracted bars so that add-on case is less likely to fall off from the extracted bars during traveling. This practice is only suitable for a small and light-weight add-on case for the following reasons. Since the add-on case is positioned immediately adjacent to the grip handle of the extractable handle assembly, almost entire weight of the add-on case will impose on user's hand. Therefore, the total weight can be too heavy for user to carry if the add-on case is quite heavy. Since the extracted bars of extractable handle assembly offers only a narrow landing and supporting area, a large size add-on case is more difficult to maintain its balance on such narrow landing area, and can easily fall off from the handle bars during traveling.
In prior art, many wheeled suitcases provide carrying devices/straps at the top side of the wheeled suitcase for carrying an add-on traveling case on front side rather than top side of wheeled suitcase. These carrying devices/straps may help user to get a relief from the weight burden of the add-on case. However, some carrying devices/straps must be assembled prior to usage, which is time consuming and inconvenient. Since the size of the add-on case may vary, these carrying devices/straps may need to be readjusted in order to fit a particular add-on case. This is also time consuming and inconvenient.
During transport of the wheeled suitcase, these carrying devices/straps may cause transport problem, or may be damaged. When these carrying devices/straps are not fit or properly adjusted to the height of add-on case, the add-on case is likely to be hung in suspension. In this case, the wheeled suitcase can not possibly maintain its balance in a self-standing upright position, due to the fact that add-on case is positioned outwardly from the foot-stands of the wheeled suitcase.
The motive of present invention is to provide a wheeled suitcase that allows user to conveniently load and unload add-on traveling case in various sizes and weights, while the wheeled suitcase is capable of maintaining its balance in self-standing upright position. Another motive of present invention is to allow the wheeled suitcase to stably carry an add-on case in a balanced state during traveling, so that the weight of add-on case will mostly impose on the wheels of suitcase rather than user's hand. In present invention, in addition to the first extractable handle assembly positioned immediately adjacent to the front side of wheeled suitcase for pulling/wheeling the wheeled suitcase, a second extractable handle assembly is positioned immediately adjacent to the bottom side of wheeled suitcase. When the second extractable handle assembly is retracted to a compact position (FIG. 3A), the wheeled suitcase of present invention operates as a conventional wheeled suitcase of prior art. When the second extractable handle is fully extracted, it provides a rigid frame/platform for supporting the add-on case (FIG. 3B). In present invention, foot stands of wheeled suitcase are anchored to the second extractable handle assembly in lieu of the wheeled suitcase. Therefore, the foot-stands move outwardly from the wheeled suitcase when the second extractable handle assembly is extracted outwardly. As a result, user can load and unload add-on case while maintaining wheeled suitcase in self-standing upright position. When the add-on case is carried by the wheeled suitcase during traveling (FIG. 3C), downward sliding movement of the add-on case is stopped by the extracted bars of the second extractable handle assembly, and most of add-on case weight imposes on wheeled suitcase rather than the extracted bars of the second extractable handle assembly. Therefore, the extracted bars of the second extractable handle assembly does not transmit any large force and torque during traveling, as compared to that of the first extractable handle assembly. The leverage of first and second handle assemblies helps to balance the loads contributed by wheeled suitcase and add-on case. As a result, the center of gravity of the entire loads is shifting toward the wheels rather than user. Ideally, by properly arranging sizes and weights of the wheeled suitcase and add-on case, it is possible to position the center of gravity of the entire load in vertical alignment with the centerline of wheels. In this case, no force will impose on user when user pulls/wheels the wheeled suitcase with the add-on case.
It is understood that, when the second extractable handle assembly of present invention is carrying an add-on case in various sizes and weights, the wheeled suitcase can still carry a second small and light weight traveling case on top side of wheeled suitcase without depriving the above advantages offered by the second extractable handle assembly.

SUMMARY OF THE INVENTION

An object of present invention is to provide a second extractable handle assembly for stably and conveniently loading an add-on case in various sizes, when the wheeled suitcase is in either a self standing upright position or an inclined traveling position.
Another object of present invention is to provide an anchoring means for the second extractable handle assembly, so that the wheeled suitcase is capable of sustaining the bending moment due to the combined weights of wheeled suitcase and add-on case when it is tilted from self-standing upright position to inclined traveling position.
Another object of present invention is to provide a locking and releasing means for operating the second extractable handle assembly between a fully retracted compact position and a fully extracted position.
Another object of present invention is to provide a pair of moveable foot stands capable of supporting wheeled suitcase in self-standing upright position while loading and unloading the add-on case.
Another object of present invention is to provide such foot stands with flat top surfaces flush to top surfaces of extracted bars of the second extractable handle assembly, so that add-on case can stably sit on the even top surfaces of the extracted bars and foot stands while loading the add-on case.
Another object of present invention is to provide such a second extractable handle assembly that is less likely to be accidentally damaged during transport of the wheeled suitcase.
Another object of present invention is to provide such a second extractable handle assembly that significantly reduces the weight imposed on user while pulling and wheeling the wheeled suitcase with add-on case.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic drawing that shows a wheeled suitcase of prior art carrying an add-on case on top side of the wheeled suitcase.

FIG. 2 is a schematic drawing that shows a wheeled suitcase of prior art carrying an add-on case in inclined traveling position.

FIG. 3A is a schematic drawing that shows the wheeled suitcase of present invention in self-standing upright position, in which, the first extractable handle assembly is in fully extracted position, and the second extractable handle assembly is in fully retracted compact position.

FIG. 3B is a schematic drawing that shows the wheeled suitcase of present invention in self-standing upright position, in which the first and second extractable handle assemblies are in fully extracted positions, and the second extractable handle assembly is loaded with an add-on case.

FIG. 3C is a schematic drawing that shows the wheeled suitcase of present invention in inclined traveling position, in which, the first and second extractable handle assemblies are in fully extracted positions, and the second extractable handle assembly is loaded with an add-on case.

FIG. 4 shows a perspective view of the internal bottom support structure of the wheeled suitcase of present invention.

FIGS. 5A and 5B show perspective views of the first preferred embodiment of the second extractable handle assembly of present invention in fully extracted and fully retracted compact positions respectively.

FIG. 5C shows cross-sectional views of the first preferred embodiment of the second extractable handle assembly of present invention in fully extracted and fully retracted compact positions.

FIG. 5D shows an exploded view of the first preferred embodiment of the second extractable handle assembly of present invention.

FIG. 5E shows an exploded view of the locking assembly of the first preferred embodiment of the second extractable handle assembly of present invention.

FIG. 5F shows an alternative form of anchor for use in the first preferred embodiment of the second extractable handle assembly of present invention.

FIG. 6A shows a perspective view of the second preferred embodiment of the second extractable handle assembly of present invention in fully extracted position.

FIG. 6B shows cross-sectional views of the second preferred embodiment of the second extractable handle assembly of present invention in fully extracted and fully retracted compact positions.

FIG. 7 shows a perspective view of the third preferred embodiment of the second extractable handle assembly of present invention in fully extracted position.

FIG. 8 shows a perspective view of the fourth preferred embodiment of the second extractable handle assembly of present invention in fully extracted position.

FIG. 9 shows a perspective view of the fifth preferred embodiment of the second extractable handle assembly of present invention in fully extracted position.

FIG. 10 shows a perspective view of the sixth preferred embodiment of the second extractable handle assembly of present invention in fully extracted position.

FIG. 11 shows a perspective view of the seventh preferred embodiment of the second extractable handle assembly of present invention in fully extracted position.

FIG. 12 shows a perspective view of the eighth preferred embodiment of the second extractable handle assembly of present invention in fully extracted position.

DETAILED DESCRIPTION OF THE DRAWINGS

FIG. 1 through FIG. 3C were previously discussed in above Background of the Invention.
FIG. 4 shows a perspective view of the internal support structure adjacent to the bottom side of the wheeled suitcase of present invention. In FIG. 4, the internal support structure consists of flexible guard sheets 1 and 2, a rigid frame 3 and an anchor 4, which are interconnected by mechanical fasteners (not shown). Guard sheets 1 and 2 protect the interior of suitcase, and reinforce the bottom corners of suitcase for anchoring a pair of wheel assemblies (not shown). Anchor 4 is for positioning the first extractable handle assembly immediately adjacent to the rear side of wheeled suitcase. Anchor 4 is preferably a molded piece comprising of a L-angle plate with vertical and horizontal plates 5 and 6, and two integral vertical sockets 7 for receiving and fixedly connecting to the guide tracks 8 of the first extractable handle assembly (not shown). The integral joint of L-angle plate of anchor 4 may bear and sustain a significant bending moment. Such bending moment is caused by the combined weight of wheeled suitcase and add-on case when user pulls the top handle of the first extractable handle assembly to tilt the wheeled suitcase from self-standing upright position to inclined traveling position. Therefore, sockets 7 are preferably, longitudinally and laterally connected to both vertical plate 5 and horizontal plate 6 to maximize the bending strength of anchor 4. Two spacer plates 9 are inserted between frame 3 and guard sheet 1 on each side of horizontal plate 6. Alternatively, spacer plates 9 and horizontal plate 6 of anchor 4 can be an integral plate.
It is understood that techniques for the first extractable handle assembly, the internal support structure of wheeled suitcase, and anchoring means for the first extractable handle assembly have been well known in prior art. It is not the intent of present invention to specify them in details. FIG. 4 shows a preferable anchoring means and surrounded support structure for use in present invention, which are not intended for limiting the scope of present invention. In fact, FIG. 4 is intended for illustrating a method for interconnecting the anchoring means of the first and second extractable handle assemblies, which will be discussed later.
FIGS. 5A and 5B show perspective views of the first preferred embodiment of the second extractable handle assembly 10 of present invention in fully extracted position and in fully retracted compact position respectively. The second extractable handle assembly 10 consists of an anchor 11, a pair of guide tracks 12 and 13 made from U-shape channel bars, a pair of sliding tracks 14 and 15 made from box shape channel bars, a cross plate 16 connected to the front ends of guide tracks 12 and 13, a center plate 17 integrally connected to the bottom sides of sliding tracks 14 and 15, a bar handle 18, and a pair of foot stands 19 and 20 anchored at the joints between bar handle 18 and sliding tracks 14 and 15. Cross plate 16 provides a latch 21 for engaging the locking assembly of second extractable handle assembly 10 (which will be discussed later). Plate 17 and sliding tracks 14 and 15 provide a frame/platform for loading an add-on traveling case when the second extractable handle assembly 10 is in fully extracted position.
Anchor 11 is for positioning the second extractable handle assembly 10 immediately adjacent to the bottom side of wheeled suitcase. Anchor 11 is preferably a molded piece comprising of a L-angle plate with vertical and horizontal plates 22 and 23, and two sockets 24 integrally connected to horizontal plate 23 for receiving and fixedly connecting to guide tracks 12 and 13. During installation, anchor 11 is interconnected to anchor 4 (FIG. 4) by overlapping and fixedly connecting vertical and horizontal plates 22 and 23 of anchor 11 to the vertical and horizontal plates 5 and 6 of anchor 4 respectively. As a result, when user pulls the top handle of first extractable handle assembly to tilt the wheeled suitcase with add-on case from self standing upright position to inclined traveling position, the total bending moment caused by the combined weight of wheeled suitcase and add-on case will be evenly distributed to and carried by both anchor 11 and anchor 4.
The above anchoring means provided by anchor 11 is intended for use under the condition when anchor 4 of the first extractable handle assembly alone is not capable of sustaining the above total moment. If anchor 4 is capable of sustaining the above total moment, it becomes apparent that anchor 11 can be in other alternative forms that allow the above total moment to be distributed to and carried by anchor 4 only. For example, one alternative form of anchor 11 is shown in FIG. 5F, in which, L-angle plate of anchor 11 is now replaced by a horizontal plate 25.
FIG. 5C shows cross-sectional views of FIGS. 5A and 5B. FIG. 5D shows an exploded view of FIGS. 5A and 5B. These drawings are intended for showing the following components that are not shown or clearly shown in FIGS. 5A and 5B:
A pair of sliding gliders 26 fixedly connected to the rear ends of sliding tracks 14 and 15, and a pair of guiders/stoppers 27 fixedly connected to the front ends of guide tracks 12 and 13, so that sliding tracks 14 and 15 can slide freely within guide tracks 12 and 13 with minimum friction; and
A pair of spring-biased detent devices 28 inserted within the rear ends of sliding tracks 14 and 15, which provide a conventional detent means for engaging and disengaging sliding tracks 14 & 15 to and from their fully extracted position; and
Foot stands 29 and 30, which are preferably molded pieces, have square ends 31 and 32 for inserting and fixedly connecting to the front ends of sliding tracks 14 and 15, and socket ends 33 and 34 for receiving and fixedly connecting to handle bar 18. It must be noticed that foot stands 29 and 30 in FIG. 5D are identical to foot stands 19 and 20 respectively in FIGS. 5A and 5C. It can also be noticed from FIG. 5C that the flat top surfaces of foot stands 19 and 20 are flush with the top surfaces of sliding tracks 14 and 15. This allows add-on case to stably sit on even top surfaces of foot stands 19 & 20, and sliding tracks 14 & 15 when loading the add-on case.
FIG. 5E shows a locking assembly 35 installed within handle bar 18. Locking assembly 35 consists of a pull bar 36 made from a U-shape channel bar, guide tracks 37, a sleeve 38 having a first, second and third lateral fingers 39, 40 and 41 circumferentially apart from each other at specified angle, a compression spring 42 connected to third finger 41, a cut off 43 for accessing pull bar 36 by hand, and a window 44 that allows the front hook section of second finger 40 to access and engage to the latch 21 provided in mid section of cross plate 16 (FIGS. 5A and 5D).
Locking assembly 35 can be operated as follows. When user pulls bar handle 18 and pull bar 36 simultaneously, movement of pull bar 36 causes a counter clockwise rotation of sleeve 38, and thus causes the front hook of second finger 40 to disengage from latch 21. As a result, the locking engagement of locking assembly 35 is released. Compressed spring 42 imposes a biased force on the third finger 41, which allows the front hook of second finger 40 to automatically engage with latch 21 when the profiled end of front hook of second finger 40 is pressed against latch 21. As a result, locking assembly 35 is automatically engaged into a locked position when user pushes bar handle 18 and moves the second extractable handle assembly to the fully retracted compact position.
It is understood that techniques of spring biased detent means and locking means have been well known in prior art. The above described spring biased detent device 28 and locking assembly 35 are not intended to limit the scope of present invention. Variations and modifications are allowed within the scope of present invention, provided they meet the functional requirements of the second extractable handle assembly specified in present invention. For example, in prior art, the spring biased detent device typically provides a positive locking means, so that user needs to pull a trigger, which remotely operates the spring biased detent device through a connecting rod, to release the positive locking means. Such prior techniques have been commonly used in the extractable handle assembly for pulling and wheeling the wheeled suitcase. This is because the extractable handle assembly must transmit large force and torque during pulling and wheeling the wheeled suitcase. Therefore, it is necessary to positively lock the extractable handle assembly in fully extracted position to allow such large force and torque to be transmitted. However, the above condition does not exist in the second extractable handle assembly of present invention. As a result, the above described spring biased detent device 28 and locking assembly 35 become more desirable since they offer advantages of cost saving and convenience.
In the second extractable handle assembly 10 of present invention, some components are preferably connected by a fast connecting means without using mechanical fasteners. These components include but not limit to: gliders 26 (connected to sliding tracks 14 and 15), guiders/stoppers 27 (connected to guide tracks 12 and 13), sockets 24 of anchor 11 (connected to guide tracks 12 and 13), and cross plate 16 (connected to guide tracks 12 and 13). Fast connecting means without using mechanical fastener has been well known in prior art. It is not the intent of present invention to specify it in details. However, for illustrating purpose, the following fast connecting means can be an example for connecting socket 24 of anchor 11 to guide track 12. First, prefabricate a snap hook projected outwardly from the top surface of guide track 12. (This can be done by a metal stamping method if track 12 is metal, or by an injection molding method if track 12 is plastic.) Second, form a dent or a hole on the internal surface of socket 24 during plastic injection molding of anchor 11. Third, insert guide track 12 into socket 24 to form a fixed connection when the snap hook snaps and engages into the dent or hole. It is understood that these fast connecting connections are not intended to be clearly identified in the drawings of present invention.
It is understood that, according to present invention, the overall size of second extractable handle assembly in fully retracted compact position does not exceed that of the bottom side of wheeled suitcase. This is necessary to protect the second extractable handle assembly from being damaged during transport of the wheeled suitcase, and to prevent it from causing a transport problem. The height of second extractable handle assembly does not exceed the height of wheels. This is necessary to provide a clearance from the ground for pulling and wheeling the wheeled suitcase. Due to the restricted clearance, user may preferably tilt the wheeled suitcase slightly when she or he needs to access bar handle of the second extractable handle assembly.
It is also understood that the above described first preferred embodiment of second extractable handle assembly of present invention is intended for use for a large size wheeled suitcase. This is because the overall size of second extractable handle assembly in fully retracted compact position is restricted by that of the bottom side of wheeled suitcase. Therefore, the size of the extended platform for loading the add-on case is also restricted by the bottom size of wheeled suitcase.
FIG. 6A shows a perspective view of the second preferred embodiment of the second extractable handle assembly of present invention in fully extracted position. The perspective view of the second preferred embodiment of the second extractable handle assembly of present invention in fully retracted compact position can be represented by FIG. 5B in the first preferred embodiment. FIG. 6B shows cross-sectional views of the second preferred embodiment of the second extractable handle assembly of present invention in fully extracted and fully retracted compact positions. The second preferred embodiment is identical to the first preferred embodiment with the following exceptions. First, in the second preferred embodiment, second extractable handle assembly 45 is provided with additional second pair of sliding tracks 46 and 47 slidable within the first pair of sliding tracks 48 and 49. Second, foot stands 50 and 51 of second extractable handle assembly 45 are anchored at the joints between second pair of sliding tracks 46 & 47 and bar handle 52. Third, additional second pair of spring biased detent devices 53 (FIG. 6B) are provided between first and second pair of sliding tracks, which are similar to the first pair of spring biased detent device 54 between guide tracks 55 & 56 and first pair of sliding tracks 48 & 49, or the spring biased detent devices 28 of the first preferred embodiment. As a result, the second extractable handle assembly 45 offers a significantly larger landing area for loading the add-on case as compared to that of the first preferred embodiment. It can be noticed from FIG. 6B that top surfaces of foot stands 50 and 51 are shown flush with the top surfaces of second pair of sliding tracks 46 and 47. Alternatively, the top surfaces of foot stands 50 and 51 can be flush with the top surfaces of first pair of sliding tracks 48 and 49. In this case, a large add-on case can sit on the even top surfaces of first pair of sliding tracks 48 & 49, and foot stands 50 and 51.
FIG. 7 show a perspective view of the third preferred embodiment of the second extractable handle assembly of present invention in fully extracted position. The third preferred embodiment is identical to the first preferred embodiment with the following exceptions. First, in the third preferred embodiment, the second extractable handle assembly 57 has a pair of guide tracks 58 and 59 made of box shape channel bars in lieu of U shape channel bars of the first preferred embodiment. Second, there is no center plate interconnected between sliding tracks 60 and 61. As a result, the second extractable handle assembly 57 is similar to a conventional 2-stage extractable handle assemble of prior art, which is commonly used for pulling and wheeling the wheeled suitcase.
FIG. 8 shows a perspective view of the fourth preferred embodiment of the second extractable handle assembly of present invention in fully extracted position. The fourth preferred embodiment is identical to the second preferred embodiment with the following exceptions. First, in the fourth preferred embodiment, the second extractable handle assembly 62 has a pair of guide tracks 63 and 64 made of box shape channel bars in lieu of U shape channel bars of the second preferred embodiment. Second, there is no center plate interconnected between sliding tracks 65 and 66. As a result, the second extractable handle assembly 62 is similar to a conventional 3-stage extractable handle assemble of prior art, which is commonly used for pulling and wheeling the wheeled suitcase.
FIG. 9 shows a perspective view of the fifth preferred embodiment of the second extractable handle assembly of present invention in fully extracted position. The fifth preferred embodiment is identical to the first preferred embodiment with the following exceptions. First, in the fifth preferred embodiment, the second extractable handle assembly 67 is provided with a horizontal anchor plate 68 to replace anchor 11 and cross plate 16 of the first preferred embodiment. During installation, anchor plate 68 is fixedly connected to horizontal plate 6 of anchor 4 (FIG. 4). Second, guide tracks 69 and 70 are fixedly connected to the horizontal anchor plate 69. Preferably, anchor plate 68 and guide tracks 69 and 70 are integral pieces made from plastic injection molding.
It is understood that the above fifth preferred embodiment is intended for use under the condition that anchor 4 of the first extractable handle assembly (FIG. 4) alone is capable of sustaining the bending moment caused by the combined weight of wheeled suitcase and add-on case, when user pulls the top handle of the first extractable handle assembly to tilt the wheeled suitcase loaded with add-on case from self standing upright position to inclined traveling position. This is due to the fact that the above bending moment will be totally distributed to and carried by anchor 4 after anchor plate 68 is interconnected to anchor 4.
FIG. 10 shows a perspective view of the sixth preferred embodiment of the second extractable handle assembly of present invention in fully extracted position. The sixth preferred embodiment is identical to the second preferred embodiment with two exceptions, which are the same exceptions as previously discussed in the above fifth preferred embodiment. In the sixth preferred embodiment, second extractable handle assembly 71 is also intended for use under the condition that anchor 4 of the first extractable handle assembly is capable of sustaining the total bending moment caused by the combined weights of wheeled suitcase and add-on case.
FIG. 11 shows a perspective view of the seventh preferred embodiment of the second extractable handle assembly of present invention in fully extracted position. The seventh preferred-embodiment 72 is identical to the third preferred embodiment with two exceptions, which are the same exceptions as previously discussed in the above fifth preferred embodiment. The seventh preferred embodiment 72 is also intended for use under the condition that anchor 4 of the first extractable handle assembly is capable of sustaining the total bending moment caused by the combined weights of wheeled suitcase and add-on case.
FIG. 12 shows a perspective view of the eighth preferred embodiment of the second extractable handle assembly of present invention in fully extracted position. The eighth preferred embodiment 73 is identical to the fourth preferred embodiment with two exceptions, which are the same exceptions as previously discussed in the above fifth preferred embodiment. The eighth preferred embodiment 73 is also intended for use under the condition that anchor 4 of the first extractable handle assembly is capable of sustaining the total bending moment caused by the combined weights of wheeled suitcase and add-on case.

Claims

1. A wheeled suitcase comprising of:

a front side for accessing interior of said wheeled suitcase, a rear side opposite and parallel to said front side, a top and bottom sides opposite and parallel to each other, and a left and right sides opposite and parallel to each other; and

a pair of wheel assemblies anchored to said bottom side immediately adjacent to said rear side of said wheeled suitcase; and

a first extractable handle assembly fixedly anchored immediately adjacent to said rear side of said wheeled suitcase, capable of being retracted to a fully retracted compact position, and extracted to a fully extracted position for pulling and wheeling said wheeled suitcase in an inclined traveling position; and

a second extractable handle assembly fixedly anchored immediately adjacent to said bottom side of said wheeled suitcase, capable of being retracted to a fully retracted compact position, and extracted to a fully extracted position to form a landing area for loading an add-on case; and

a pair of foot stands fixedly connected to said second extractable handle assembly, capable of supporting said wheeled suitcase in a self standing upright position when said second extractable handle assembly is in said fully retracted compact position, and when said second extractable handle assembly is in said fully extracted position for loading said add-on case; and

a first and second anchoring means for fixedly anchoring said first and second extractable handle assemblies respectively, capable of being interconnected to each other to sustain a bending moment due to the combined weight of said wheeled suitcase and said add-on case when said wheeled suitcase being tilted from said self standing upright position to said inclined traveling position; and

a first and second locking and releasing means for operating said first and second extractable handle assemblies respectively between said fully retracted compact position and said fully extracted position.

2. The wheeled suitcase according to claim 1, in which:

said first anchoring means comprises of a L-angle plate having a vertical and horizontal sectional plates, and two sockets integrally connected to said vertical sectional plate of said L-angle plate for receiving and fixedly connecting to a pair of guide tracks of said first extractable handle assembly; and

said second anchoring means comprises of a L-angle plate having a vertical and horizontal sectional plates, and two sockets integrally connected to said horizontal sectional plate of said L-angle plate for receiving and fixedly connecting to a pair of guide tracks of said second extractable handle assembly; and

said first and second anchoring means are interconnected by overlapping and fixedly connecting said vertical and horizontal sectional plates of said L-angle plate of said second anchoring means to said vertical and horizontal sectional plates of said L-angle plate of said first anchoring means respectively.

3. The wheeled suitcase according to claim 1, in which:

said second anchoring means comprises of a horizontal plate, and two sockets integrally connected to said horizontal plate for receiving and fixedly connecting to a pair of guide tracks of said second extractable handle assembly; and

said first and second anchoring means are interconnected by overlapping and fixedly connecting said horizontal plate of said second anchoring means to said horizontal sectional plate of said L-angle plate of said first anchoring means.

4. The wheeled suitcase according to claim 1, in which:

said second anchoring means comprises of a horizontal plate, and a pair of guide tracks of said second extractable handle assembly fixedly connected to said horizontal plate; and

5. The wheeled suitcase according to claim 1, in which:

said second extractable handle assembly comprises of a pair of guide tracks, a pair of sliding tracks capable of sliding freely within said guide tracks, and a cross bar handle fixedly connected to the front ends of said sliding tracks; and

said foot stands are fixedly connected to said second extractable handle assembly at the joints between said sliding tracks and said cross bar handle.

6. The second extractable handle assembly according to claim 5, in which:

said guide tracks are made of u-shape channel bars, and said sliding tracks are made of box-shape channel bars integrally connected to a center plate, so that said sliding tracks and said center plate form an integral piece slidable along said guide tracks.

7. The wheeled suitcase according to claim 1, in which:

said second extractable handle assembly comprises of a pair of guide tracks, a first pair of sliding tracks capable of sliding freely within said guide tracks, a second pair of sliding tracks capable of sliding freely within said first pair of sliding tracks, and a cross bar handle fixedly connected to the front ends of said second pair of sliding tracks; and

said foot stands are fixedly connected to said second extractable handle assembly at the joints between said second pair of sliding tracks and said cross bar handle.

8. The second extractable handle assembly according to claim 7, in which:

said guide tracks are made of u-shape channel bars; and

said first and second pairs of sliding tracks are made of box-shape channel bars; and

said first pair of sliding tracks are integrally connected to a center plate, so that said first pair of sliding tracks and said center plate form an integral piece slidable along said guide tracks.