Extensible draw-bar box

Abstract

The utility model discloses an extensible draw-bar box which comprises a box body and a box cover located at the front end of the box body, the box cover is detachably connected with the box body, an extension frame is arranged on the side face, facing the box body, of the box cover, and the extension frame comprises first extension plates on the left side and the right side of the box cover and second extension plates at the upper end and the lower end of the box cover. The first expansion board and the second expansion board are both connected with the inner wall of the box body in a sliding mode, a fixing mechanism is arranged between the first expansion board and the box body, a positioning mechanism is arranged between the second expansion board and the box body, and the expansion frame and the box body are both made of hard materials. And articles stored in the box body can be effectively protected like the box body.

Description

Technical Field

[0001] The utility model belongs to the technical field of trolley cases, and more particularly relates to an expandable trolley case. Background Art

[0002] In order to increase the storage capacity of a suitcase, an expandable layer is generally provided on the suitcase. However, the structure of the expandable layer is generally flexible fabric. After expansion, the expanded portion cannot have a hard shell to protect the items inside like other parts of the suitcase body, which has certain defects. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention provides a trolley case, which can expand the storage space inside the case and has an expandable portion made of a hard material, thereby effectively protecting items placed inside.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an expandable trolley case, comprising a case body and a case cover located at the front end of the case body, the case cover being detachably connected to the case body, an expansion frame being provided on the side of the case cover facing the case body, the expansion frame comprising first expansion plates on the left and right sides of the case cover and second expansion plates at the upper and lower ends of the case cover, the first expansion plate and the second expansion plate being both slidably connected to the inner wall of the case body, a fixing mechanism being provided between the first expansion plate and the case body, a positioning mechanism being provided between the second expansion plate and the case body, and the expansion frame and the case body being both made of hard materials.

[0005] Furthermore, the fixing mechanism includes a pull rod, one end of which extends out of the box body and the other end extends out of the first extension plate. The end extending out of the box body is rotatably connected to an eccentric clamping rod, and the end extending out of the first extension plate is provided with a clamping plate.

[0006] Furthermore, a positioning block corresponding to the eccentric pressing rod is provided on the box body, and an arc-shaped slot is provided on the positioning block.

[0007] Furthermore, the positioning mechanism includes a first positioning device and a second positioning device respectively located on the upper and lower second extension plates. The first positioning device includes a box body located outside the box body, a pawl rod is slidably connected to the box body, and a strip-shaped ratchet groove is provided in the second extension plate. The pawl rod cooperates with the ratchet groove, and a clutch mechanism is connected to the pawl rod to realize the clutch of the pawl rod and the ratchet groove.

[0008] Furthermore, the clutch mechanism includes a button plate located on the surface of the box body, a driving rod connected to the button plate, and an intermediate rod. The intermediate rod is rotatably connected to the box body, and a torsion spring is provided between the rotating shaft of the intermediate rod and the box body. The two ends of the intermediate rod are respectively hinged with connecting rods, and the two connecting rods are respectively hinged to the driving rod and the clamping rod.

[0009] Furthermore, the second positioning device includes a spring top bead located on the inner wall of the bottom of the box body, and the second extension plate is provided with a strip-shaped wave groove corresponding to the spring top bead.

[0010] Compared with the prior art, the beneficial effect of the present invention is that when the storage space in the box needs to be expanded, the fixing mechanism on the box body is loosened to allow the first expansion plate to slide between the inner wall of the box body, and then the box cover and the box body are separated, and the expansion frame is pulled out. When pulling it out, the positioning mechanism is used to position the pull-out distance of the expansion frame, and finally the first expansion plate and the box body are fixed by the fixing mechanism to complete the expansion of the storage space inside the box body. Since the expansion frame is composed of a hard first expansion plate and a second expansion plate, it can effectively protect the items stored inside like the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of the expandable trolley case of the present invention;

[0012] Figure 2 for Figure 1 Enlarged view of part A in the middle (schematic diagram of the structure of the first positioning device);

[0013] Figure 3 for Figure 1 Enlarged view of part B in the middle (schematic diagram of the structure of the second positioning device);

[0014] Figure 4 This is a schematic structural diagram of the fixing mechanism in the expandable trolley case of the present invention.

[0015] Figure numerals: box body 1; box cover 2; first expansion plate 3; second expansion plate 4; fixing mechanism 5; pull rod 6; eccentric pressing rod 7; pressing plate 8; strip-shaped through groove 9; positioning block 10; arc-shaped slot 11; box body 12; pawl rod 13; ratchet groove 14; button plate 15; driving rod 16; intermediate rod 17; torsion spring 18; connecting rod 19; spring top ball 20; wave groove 21. DETAILED DESCRIPTION

[0016] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, the terms "first" and "second" may explicitly or implicitly refer to one or more of these features. In the description of this utility model, "several" and "a number" mean two or more, unless otherwise specifically defined.

[0018] Reference Figures 1 to 4 The utility model is further described.

[0019] An expandable trolley case includes a case body 1 and a case cover 2 located at the front end of the case body 1, the case cover 2 is detachably connected to the case body 1, and an expansion frame is provided on the side of the case cover 2 facing the case body 1, the expansion frame includes first expansion plates 3 on the left and right sides of the case cover 2 and second expansion plates 4 at the upper and lower ends of the case cover 2, the first expansion plates 3 and the second expansion plates 4 are both slidably connected to the inner wall of the case body 1, a fixing mechanism 5 is provided between the first expansion plate 3 and the case body 1, and a positioning mechanism is provided between the second expansion plate 4 and the case body 1, and the expansion frame and the case body 1 are both made of hard material.

[0020] like Figure 4 As shown, in this example, preferably, the fixing mechanism 5 includes a pull rod 6, one end of the pull rod 6 extends out of the box body 1, and the other end extends out of the first expansion plate 3. The end extending out of the box body 1 is rotatably connected to an eccentric clamping rod 7, and the end extending out of the first expansion plate 3 is provided with a clamping plate 8.

[0021] In this embodiment, preferably, a guide rail and slide groove structure is provided between the first expansion board 3 and the second expansion board 4 and the inner wall of the box body 1 to improve the stability of the expansion frame when it is pulled out and inserted.

[0022] Specifically, after the expansion frame is extended, the eccentric clamping rod 7 is rotated, so that the clamping plate 8 gradually increases the pressure on the first expansion plate 3 through the pull rod 6, and the friction between the first expansion plate 3 and the inner wall of the box body 1 increases until it is fully clamped, thereby fixing the first expansion plate 3 by friction.

[0023] like Figure 1 Figure 4 As shown, in this embodiment, preferably, a strip-shaped through groove 9 corresponding to the pull rod 6 is provided on the first expansion plate 3, so that the positions of the pull rod 6 and the pressing plate 8 can be kept fixed when the first expansion plate 3 is moved.

[0024] like Figure 4 As shown, in this example, preferably, a positioning block 10 corresponding to the eccentric pressing rod 7 is provided on the box body 1, and an arc-shaped slot 11 is provided on the positioning block 10. When the eccentric pressing rod 7 extends into the arc-shaped slot 11, the pressing plate 8 completely presses the first expansion plate 3 against the inner wall of the box body 1.

[0025] In this embodiment, preferably, a plurality of fixing mechanisms 5 are provided on the first expansion board 3 .

[0026] like Figure 2 As shown, in this example, preferably, the positioning mechanism includes a first positioning device and a second positioning device respectively located on the upper and lower second expansion plates 4, the first positioning device includes a box body 12 located outside the box body 1, and a pawl rod 13 is slidably connected to the box body 12, and a strip-shaped ratchet groove 14 is provided on the second expansion plate 4, the pawl rod 13 cooperates with the ratchet groove 14, and a clutch mechanism is connected to the pawl rod 13 to realize the clutch of the pawl rod 13 and the ratchet groove 14.

[0027] like Figure 2 As shown, in this example, preferably, the clutch mechanism includes a button plate 15 located on the surface of the box body 12, a driving rod 16 connected to the button plate 15, and an intermediate rod 17, the intermediate rod 17 is rotatably connected to the box body 12, and a torsion spring 18 is provided between the rotating shaft of the intermediate rod 17 and the box body 12, and the two ends of the intermediate rod 17 are respectively hinged with connecting rods 19, and the two connecting rods 19 are respectively hinged to the driving rod 16 and the clamping rod.

[0028] Specifically, when the expansion frame is pulled out, the end of the pawl rod 13 continuously separates and contacts with the ratchet in the ratchet groove 14, so that the withdrawal of the expansion frame has a sense of frustration, which improves the user experience of the expansion frame. When the expansion frame needs to be retracted, the button plate 15 is pressed, and the pawl rod 13 is lifted and completely separated from the ratchet groove 14 through the linkage action of the driving rod 16, the connecting rod 19 and the intermediate rod 17. At this time, the extension of the expansion frame will not be blocked by the pawl rod 13.

[0029] like Figure 3 As shown, in this example, preferably, the second positioning device includes a spring top bead 20 located on the inner wall of the bottom of the box body 1, and the second expansion plate 4 is provided with a strip-shaped wave groove 21 corresponding to the spring top bead 20. The extension frame is pulled out and inserted to cause the spring top bead 20 to continuously expand and contract, thereby improving the experience of the expansion frame when pulled out and inserted.

[0030] like Figures 1 to 4 As shown, when the storage space inside the box body 1 needs to be expanded, the fixing mechanism 5 on the box body 1 is loosened to allow the first expansion plate 3 to slide against the inner wall of the box body 1, and then the box cover 2 and the box body 1 are separated, and the expansion frame is pulled out. When pulling it out, the positioning mechanism is used to position the pull-out distance of the expansion frame, and finally the first expansion plate 3 and the box body 1 are fixed by the fixing mechanism 5 to complete the expansion of the storage space inside the box body 1. Since the expansion frame is composed of the hard first expansion plate 3 and the second expansion plate 4, it can effectively protect the items stored inside like the box body 1.

[0031] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An expandable suitcase, characterized by: It includes a box body and a box cover located at the front end of the box body, the box cover is detachably connected to the box body, and an expansion frame is provided on the side of the box cover facing the box body. The expansion frame includes first expansion plates on the left and right sides of the box cover and second expansion plates at the upper and lower ends of the box cover. The first expansion plate and the second expansion plate are both slidably connected to the inner wall of the box body, a fixing mechanism is provided between the first expansion plate and the box body, and a positioning mechanism is provided between the second expansion plate and the box body. The expansion frame and the box body are both made of hard material.

2. The expandable suitcase according to claim 1, characterized in that: The fixing mechanism includes a pull rod, one end of which extends out of the box body and the other end extends out of the first extension plate. The end extending out of the box body is rotatably connected to an eccentric pressing rod, and the end extending out of the first extension plate is provided with a pressing plate.

3. The expandable suitcase according to claim 2, characterized in that: The box body is provided with a positioning block corresponding to the eccentric pressing rod, and the positioning block is provided with an arc-shaped slot.

4. The expandable suitcase according to claim 1, characterized in that: The positioning mechanism includes a first positioning device and a second positioning device respectively located on the upper and lower second extension plates. The first positioning device includes a box body located outside the box body. A pawl rod is slidably connected to the box body. A strip-shaped ratchet groove is provided on the second extension plate. The pawl rod cooperates with the ratchet groove. A clutch mechanism is connected to the pawl rod to realize the clutch of the pawl rod and the ratchet groove.

5. The expandable suitcase according to claim 4, characterized in that: The clutch mechanism includes a button plate located on the surface of the box body, a driving rod connected to the button plate, and an intermediate rod. The intermediate rod is rotatably connected to the box body, and a torsion spring is provided between the rotating shaft of the intermediate rod and the box body. The two ends of the intermediate rod are respectively hinged with connecting rods, and the two connecting rods are respectively hinged to the driving rod and the clamping claw rod.

6. The expandable suitcase according to claim 4, characterized in that: The second positioning device includes a spring top bead located on the inner wall of the bottom of the box body, and the second extension plate is provided with a strip-shaped wave groove corresponding to the spring top bead.

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