CN217471413U - Folding and unfolding type stationery box - Google Patents

Abstract

The utility model discloses a folding stationery box, which comprises a lower casing, an upper casing, a cover plate and a connecting rod, wherein the lower casing is hollow and has an opening at the top, the upper casing is hollow and has openings at two ends, the cover plate seals the opening of the upper casing at one end far away from the lower casing, and one end of the upper casing far away from the cover plate is tightly pressed or just opposite to the lower casing; the lower shell comprises a lower shell, and the upper shell comprises an upper shell; two ends of each connecting rod are respectively provided with a first connecting rod pin, and the middle parts of the two connecting rods are hinged through a second connecting rod pin; a lower shell partition board is arranged on the lower shell, and a lower shell partition board groove is formed in the lower shell partition board; an upper shell partition plate is arranged on the upper shell body, and an upper shell partition plate groove is formed in the upper shell partition plate; the lower shell partition plate groove and the upper shell partition plate groove are respectively clamped with the first connecting rod pins at two ends of the two connecting rods and can be assembled in a sliding mode. The utility model discloses simple structure, and can adjust the capacity in a flexible way to adapt to the stationery of equidimension not, different quantity. In addition, the pen container can be unfolded into a pen container state, so that the pen container can be replaced for convenient use.

Description

Folding and unfolding type stationery box

Technical Field

The utility model relates to a writing case field especially relates to a folding and unfolding type writing case.

Background

The writing case is a very common study article, and is mainly used for containing small study articles such as pens, knives, rulers, erasers, penknives and the like.

However, the inventor finds that the writing case cannot be stored for a little larger or more writing utensils because the capacity of the writing case is fixed. When the stationery case is used in schools, the stationery case needs to be taken out, the stationery needs to be selected, and then the stationery needs to be put back into the drawer of the learning table, and the taken stationery is placed on the table top or in the drawer in a scattered manner, so that the use is influenced. Especially in the courses of learning painting and the like, pens with various colors are needed, and the pens are obviously messy when being directly placed on a desktop and are easy to fall off; it is inconvenient to put inside the drawer. A pen container is additionally arranged for containing common stationery for many people, but the pen container is not easy to carry, and the pen needs to be taken back to the stationery box after being used, so that the whole process is relatively troublesome, and the stationery is easy to lose.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects of the prior art, the present invention provides a foldable writing case, which can be unfolded to become a pen-shaped case, so as to be convenient for temporarily placing stationery and using.

In order to achieve the purpose, the utility model provides a folding stationery box, which comprises a lower casing, an upper casing, a cover plate and a connecting rod, wherein the lower casing is hollow, the top of the lower casing is open, the upper casing is hollow, the two ends of the upper casing are open, the cover plate seals the opening of the upper casing at the end far away from the lower casing, and the end of the upper casing far away from the cover plate is tightly pressed or just opposite to the lower casing;

the lower shell comprises a lower shell, and the upper shell comprises an upper shell; two ends of each connecting rod are respectively provided with a first connecting rod pin, and the middle parts of the two connecting rods are hinged through a second connecting rod pin; a lower shell partition plate is arranged on the lower shell, and a lower shell partition plate groove is formed in the lower shell partition plate; an upper shell partition plate is arranged on the upper shell body, and an upper shell partition plate groove is formed in the upper shell partition plate; the lower shell partition plate groove and the upper shell partition plate groove are clamped with the first connecting rod pins at two ends of the two connecting rods respectively and can be assembled in a sliding mode.

As a further improvement of the utility model, a lower shell chute is arranged on the lower shell, and an upper shell chute is arranged on the upper shell; be provided with the apron arch on the apron, be provided with the apron pivot in the apron arch, in the epitheca spout, inferior valve spout of putting into of apron pivot alternative card, and the apron pivot can make progress the casing and rotate in order to cover the opening that the inferior valve one end was kept away from to the epitheca spout when being located the one end department of casing under the epitheca spout keeps away from most.

As a further improvement of the utility model, the lower shell clapboard and the upper shell clapboard are respectively assembled and fixed with two ends of a first flexible sheet, and the first flexible sheet has elasticity; the first flexible sheet is closed at four sides and is open at two ends or is open at least at one end far away from the lower shell.

As a further improvement, the outer side of the upper shell and the lower shell which are positioned on the connecting rod are respectively assembled with the two ends of the second flexible sheet, and the second flexible sheet has telescopic elasticity.

As a further improvement, the same end of two mutually articulated connecting rods is still assembled with the both ends of pulling force piece respectively, the pulling force piece has elasticity, and the pulling force piece is used for producing the pivoted elasticity that is close to each other to two connecting rods.

As a further improvement of the utility model, a cover plate buckle is arranged on the cover plate, an upper shell lock groove is arranged at the corresponding position of the upper shell and the cover plate buckle, a buckle is arranged on the cover plate buckle, and the buckle has elasticity; the buckle penetrates through the upper shell lock groove and then is clamped with the end face, located on the inner side of the upper shell lock groove, of the upper shell, so that the cover plate is clamped on the upper shell.

As a further improvement of the utility model, the upper shell is provided with locking components, the locking components are used for clamping the corresponding first connecting rod pins, and the two locking components are a pair of locking components; each first link pin corresponds to one pair of lock components;

two first connecting rod pins at the same end respectively correspond to two pairs of different locking assemblies; the two locking assemblies in the same pair are respectively used for clamping the first connecting rod pins corresponding to the maximum interval and the minimum interval between the upper shell and the lower shell;

the locking assembly comprises a support, an upper locking frame and a sliding shaft, the support is mounted on the upper shell, and a support plate is arranged on the support; the support plate is assembled with one end of the sliding shaft, the other end of the sliding shaft penetrates through the stress plate and then is assembled with the shaft seat plate, the shaft seat plate is installed in the locking channel, and the locking channel penetrates through the upper shell; the stress plate is arranged on the upper lock frame, the upper lock frame is also provided with a locking push plate and a locking clamping plate respectively, and the locking clamping plate is provided with a locking groove which can be clamped and assembled with the first connecting rod pin;

the part of the sliding shaft between the stress plate and the support plate is sleeved with a spring, and the spring applies elasticity for pushing the shaft seat plate to the upper locking frame, so that the upper locking clamping plate is in a state closest to the shaft seat plate in an initial state.

As a further improvement of the utility model, the locking push plates of the same pair of locking assemblies are respectively assembled with the same unlocking plate, the unlocking plates are arranged in the unlocking grooves, and the unlocking grooves are arranged on the upper shell; when the cover plate is tightly assembled with the upper shell, the unlocking plate and the locking push plate are shielded by the cover plate.

As a further improvement, the lower casing is provided with a lower casing holding groove, the upper casing holding groove is assembled with the corresponding first connecting rod pin block and slidably, and the two ends of the first connecting rod pin are respectively clamped between the inner wall of the lower casing holding groove and the inner wall of the lower casing partition plate groove.

As a further improvement of the utility model, a hand-held device is arranged on the cover plate, the hand-held device comprises an elastic belt, belt grooves are respectively arranged on two ends of the elastic belt, the belt grooves are sleeved on retaining pins, and the retaining pins are arranged on the cover plate; the elastic band has elasticity, and the elastic band lays on the apron through self elasticity when initial condition.

The utility model has the advantages that:

the utility model discloses simple structure, and can adjust the capacity in a flexible way to adapt to the stationery of equidimension not, different quantity. In addition, the pen container can be unfolded into a pen container state, so that the pen container can be replaced, the pen container is convenient to use, repeated storage is not needed, the whole stationery is placed in the first flexible sheet, then the upper cover plate is covered, or the upper shell and the lower shell are firstly packed, and then the upper cover plate is covered to finish the storage, and the pen container is very convenient and practical.

Drawings

FIG. 1 is a schematic structural diagram of the first embodiment;

FIG. 2 is a schematic structural diagram according to the first embodiment;

fig. 3 is a schematic structural view of the first embodiment (the cover plate 300 is rotated by 90 ° to be in an open state);

fig. 4 is a schematic structural view of the first embodiment (the cover plate 300 is turned by 90 ° and then moved downward to be clamped into the lower housing groove 111);

FIG. 5 is a schematic structural view of the first embodiment (a cross-sectional view at an end face of the cover plate fastener 320);

FIG. 6 is an enlarged view at A in FIG. 5;

fig. 7 is a sectional view at the center plane of the axis of the slide shaft 640;

FIG. 8 is an enlarged view at B of FIG. 7;

FIG. 9 is a schematic view showing a state where the first embodiment is unfolded into a pen container;

FIG. 10 is a schematic view showing a state where the first embodiment is unfolded into a pen container;

FIG. 11 is a schematic view showing a state where the first embodiment is unfolded into a pen container;

FIG. 12 is a schematic view showing a state where the first embodiment is unfolded into a pen container;

FIG. 13 is a schematic view of the structure of second flexible sheet 420, first flexible sheet 410, and connecting rod 510;

FIG. 14 is a schematic view of the structure of second flexible sheet 420, first flexible sheet 410, and connecting rod 510;

fig. 15 is a partial structural view of a cross-sectional view at another center plane where the axis of the spool 640 is located (at the lower housing retaining groove 112);

FIG. 16 is a schematic view of the structure of the pliable material;

FIG. 17 is a schematic structural view of the second embodiment;

fig. 18 is a partial structure diagram of the cover plate 300 and the elastic band 340.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Example one

Referring to fig. 1 to 15, the foldable writing case includes a lower case 100, an upper case 200, a cover plate 300, and a connecting rod 510, wherein the lower case 100 is hollow and has an open top, the upper case 200 is hollow and has two open ends, the cover plate 300 closes the opening at one end of the upper case 200 away from the lower case 100, and one end of the upper case 200 away from the cover plate 300 is pressed or aligned with the lower case 100.

The lower case 100 includes a lower case 110, and a lower case sliding groove 111 is provided on the lower case 110; the upper shell 200 comprises an upper shell 210, and an upper shell sliding groove 211 is arranged on the upper shell 210; the cover plate 300 is provided with a cover plate protrusion 310, the cover plate protrusion 310 is provided with a cover plate rotating shaft 311, the cover plate rotating shaft 311 is clamped into the upper shell sliding groove 211 and the lower shell sliding groove 111, and the cover plate rotating shaft 311 is located at one end of the upper shell sliding groove 211 which is farthest away from the lower shell 110, and can rotate towards the upper shell 210 to cover an opening of the upper shell 210 which is far away from one end of the lower shell 100.

Preferably, the upper case 210 is further provided with a notch 212, and the notch 212 penetrates through the upper case 210 so that a finger can extend below the cover 300 to open the cover 300. When the cover plate is used, lifting force is applied to one end, located in the notch 212, of the cover plate, so that the buckle 321 enters the upper shell lock groove 213, and then the cover plate 300 is rotated to be opened. If the pen container is needed to be switched to the pen container state, the cover plate 300 is rotated to the vertical state, and then the cover plate rotating shaft 311 slides into the lower shell 110 along the upper shell sliding groove 211 and the lower shell sliding groove 111, namely, the state shown in fig. 4, and finally, the pen container is unfolded to the state shown in fig. 9. The design mainly avoids the influence on use caused by the fact that the cover plate 300 occupies a larger space or covers the opening end of the upper shell when the pen container is in a pen container state.

Two ends of the connecting rod 510 are respectively provided with a first connecting rod pin 511, two connecting rods 510 are provided, and the middle parts of the two connecting rods 510 are hinged through a second connecting rod pin 512; a lower case partition 120 is installed on the lower case 110, and a lower case partition groove 121 is formed in the lower case partition 120; an upper shell partition plate 220 is mounted on the upper shell 210, and an upper shell partition plate groove 221 is formed in the upper shell partition plate 220; the lower and upper case partition grooves 121 and 221 are slidably fitted to the first link pins 511 at both ends of the two links 510, respectively.

Fig. 1 shows an initial state in which the upper case 200 is closely attached to the lower case 100 and is in a retracted state. Fig. 9 shows the unfolded state in which the upper case 200 and the lower case 100 reach the maximum distance; in this process, only the upper and lower cases 200 and 100 need to be pulled away from each other, so that the two links 510 rotate via the second link pin 512 to support the space between the upper and lower cases 200 and 100, thereby increasing the distance between the upper and lower cases, and at this time, the state of fig. 9 can be maintained by using the friction force between the first link pin 511 and the lower and upper case partition grooves 121 and 221.

Preferably, in this embodiment, there are two lower case partition plates 120 and two upper case partition plates 220, respectively, and thus there are at least four connecting rods 510 (two connecting rods are a pair, and two pairs of connecting rods 510 are respectively located at two sides of the inner side of the lower case 110), which can improve the stability of the upper case 200 and the lower case 100 after being unfolded.

Preferably, the lower case partition plate 120 and the upper case partition plate 220 are respectively assembled and fixed with two ends of the first flexible sheet 410, and the first flexible sheet 410 has elasticity, so that when the distance between the upper case 200 and the lower case 100 changes, the gap between the upper case 200 and the lower case 100 can be shielded by the expansion and contraction of the first flexible sheet 410, so as to prevent the stationery inside from passing out and being lost. The first flexible sheet 410 is closed at four sides and opened at two ends or at least opened at one end far away from the lower case 100, so that an inner space with an open top can be effectively formed for the storage of stationery.

Preferably, the upper and lower cases 210 and 110 are further assembled with both ends of the second flexible sheet 420 at the outer side of the connecting rod 510, and the second flexible sheet 420 also has elasticity. So that when the distance between the upper case 200 and the lower case 100 is changed, the side of the connecting rod 510 away from the first flexible sheet 410 can be shielded by extension and contraction to prevent the entry of a hand or a foreign object. Of course, the side edge of the second flexible sheet 420 can be fixed with the first flexible sheet 410 by sewing, so that there is no gap between the first flexible sheet 410 and the second flexible sheet 420 when in use, and further, the entering of the hand clamping or the foreign matter is prevented.

Preferably, the two connecting rods 510 on the same side are further respectively assembled with two ends of the tension member 520, the tension member 520 has elasticity, the tension member 520 is in a stretched state in an initial state (in a state of fig. 1), and when the tension member 520 is used, the two connecting rods 510 on the same side are driven to rotate by the elasticity of the tension member 520 so as to match the expansion between the upper shell 200 and the lower shell 100. In this embodiment, the tension member 520 may be an elastic strap, a tension spring, or the like. More preferably, both ends of the tension member 520 are respectively assembled with the two first link pins 511 of the same end of the two links 510.

Referring to fig. 8, preferably, in order to lock the cover plate 300, the present embodiment further installs a cover plate buckle 320 on the cover plate 300, and at the same time, an upper housing locking groove 213 is provided at a position of the upper housing 210 corresponding to the cover plate buckle 320, and a buckle 321 is provided on the cover plate buckle 320, and the buckle 321 has elasticity; the latch 321 passes through the upper housing locking groove 213 and then engages with the end surface of the upper housing 210 inside the upper housing locking groove 213, so as to lock the cover plate 300 on the upper housing 210.

Referring to fig. 8, preferably, in order to prevent the link 510 from rotating in an undesired condition, and thus the space between the upper shell 200 and the lower shell 100 cannot be kept stable, the present embodiment further installs a locking assembly 600 on the upper shell 210, wherein the locking assemblies 600 are used for clamping corresponding first link pins 511, and the two locking assemblies 600 are a pair of locking assemblies 600; each first link pin 511 corresponds to a pair of lock assemblies 600; two first connecting rod pins 511 at the same end respectively correspond to two different pairs of locking assemblies 600; the two locking assemblies 600 of the same pair are used to clamp the first link pins 511 corresponding to the maximum and minimum intervals between the upper and lower cases 200 and 100, respectively. That is, when the interval between the upper case 200 and the lower case 100 is at the maximum and minimum, the corresponding first link pin 511 has two positions, and the two locking assemblies 600 are respectively used to clamp the first link pin 511 located at the two positions. Once the first link pin 511 is caught, the link 510 is not rotated, so that the stowed or deployed state between the upper and lower cases 200 and 100 can be effectively supported and maintained.

The locking assembly 600 comprises a bracket 610, a locking bracket 620 and a sliding shaft 640, wherein the bracket 610 is mounted on the upper shell 210, and a bracket plate 611 is arranged on the bracket 610; the support plate 611 is assembled with one end of the sliding shaft 640, the other end of the sliding shaft 640 passes through the stress plate 624 and then is assembled with the shaft seat plate 215, the shaft seat plate 215 is installed in the upper locking channel 216, and the upper locking channel 216 passes through the upper shell 210; the stress plate 624 is disposed on the upper locking frame 620, the upper locking frame 620 is further provided with an upper locking push plate 621 and an upper locking plate 622, respectively, and the upper locking plate 622 is provided with an upper locking groove 623 capable of being engaged with the first link pin 511.

The sliding shaft 640 is sleeved with a spring 630 at a portion between the force-bearing plate 624 and the support plate 611, and the spring 630 applies an elastic force to the upper lock frame 620 to push the shaft seat plate 215, so that the upper lock plate 622 is closest to the shaft seat plate 215 in the initial state.

Fig. 8 shows a state that the first link pin 511 is engaged with the corresponding locking element 600 in the state of fig. 1, and when it is necessary to adjust to the state of fig. 9, a downward pressure is applied to the right locking push plate 621, so as to push the upper locking frame 620 to move downward against the elastic force of the spring 630 until the first link pin 511 exits the upper locking groove 623, and at this time, the two links 510 will rotate under the action of the tension member 520, so as to adjust the distance between the upper case and the lower case, and of course, the upper case and the lower case can also be manually stretched until they cannot be pulled. In the process, the first link pin 511 moves towards the upper locking groove 623 on the left side until it is pressed against the end surface of the upper locking plate 622 on the left side, and then the upper locking plate 622 is pressed, so that the upper locking bracket 620 on the left side moves downwards against the elastic force of the spring 630 until the first link pin 511 enters the upper locking groove 623, and then the upper locking bracket 620 moves upwards under the elastic force of the spring, so that the upper locking groove 623 on the left side clamps the first link pin 511, and the rotation of the link 510 is locked, and at this time, the upper shell and the lower shell reach the maximum distance. This design mainly considers that the first flexible sheet 410 and the second flexible sheet 420 have elasticity, and the elasticity of the first flexible sheet 410 and the second flexible sheet 420 acts on the connecting rod 510 after stretching, so that the connecting rod 510 is not supported stably. And maintaining the state of the upper case with respect to the lower case at two maximum displacement points also facilitates the expansion of the internal space. If the stationery is too large or too much, the upper shell can be directly unfolded, the stationery is placed, and finally the cover plate is closed, so that the accommodation capacity is increased, and the stationery is convenient to use.

Preferably, the uplock push plates 621 of the same pair of uplock assemblies 600 are respectively assembled with the same unlock plate 601, the unlock plate 610 is installed in the unlock slot 214, and the unlock slot 214 is provided on the upper case 210. When the unlocking device is used, two upper locking frames 620 of the same pair of locking assemblies 600 can be pushed to move downwards by directly pressing the unlocking plate 601 so as to realize unlocking. This design is mainly because the locking push plate 621 is too small to press, and the larger unlocking plate 601 can effectively solve the problem.

Preferably, when the cover plate 300 is tightly assembled with the upper housing 210 (to close the opening at the end of the upper housing 210 away from the lower housing 110), the cover plate covers the unlocking plate 601 and the locking push plate 621. Therefore, the upper shell 210 can be folded and unfolded only after the cover plate is opened, and the design is mainly used for surface error touch to ensure the stability in use.

Referring to fig. 15, preferably, the lower case 110 is provided with lower case retaining grooves 112, the upper case retaining grooves 112 are engaged with and slidably fitted to corresponding first link pins 511, and both ends of the first link pins 511 are respectively clamped between the inner walls of the lower case retaining grooves 112 and the inner walls of the lower case partition grooves 121, thereby improving the stability of the link 510 with respect to the upper and lower cases so that the link 510 stably supports the upper and lower cases.

Referring to fig. 16, the first flexible sheet 410 and the second flexible sheet 420 are made of flexible materials, and the flexible materials have elasticity and flexibility. Considering that the stretching amount of the first flexible sheet 410 and the second flexible sheet 420 is larger, the flexible material can be made into a bent folding shape, so that the stretching length of the flexible material is increased, and the flexible material can be shrunk and folded only through self-generated elastic force during shrinkage, similar to a spring pipe and a spring wire.

Example two

Referring to fig. 17 to 18, since the upper and lower cases are completely unfolded and have a larger volume, and thus more stationery is placed, i.e., the stationery is heavier, and the larger volume is not suitable for being placed in a bag, the present embodiment further adds a portable device, which includes an elastic band 340, wherein both ends of the elastic band 340 are respectively provided with a groove 341, the groove 341 is sleeved on a retaining pin 330, the retaining pin 330 is mounted on the cover plate 300, and the elastic band 340 is further provided with an elastic band protrusion 342 for facilitating pulling of the elastic band 340.

The elastic band 340 has elasticity, and in an initial state, it is spread on the cover plate 300 by its own elasticity to reduce the occupation of space, thereby facilitating carrying. When desired for use, the elastic band 340 is pulled up by the elastic band protrusion 342 such that the band slot 341 slides relative to the retaining pin 330 to cause the elastic band 340 to bulge at the elastic band protrusion 342 to facilitate hand pull-through. In this embodiment, the elastic band 340 may be a silicone snap ring steel sheet, which is internally a steel sheet with an elastic memory function and externally wrapped by a layer of soft silicone, thereby facilitating use.

The details of the present invention are well known to those skilled in the art.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the principles of this invention without the use of inventive faculty. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. A folding stationery box is characterized in that: the connecting rod is arranged in the lower shell, the top of the lower shell is open, the upper shell is hollow, two ends of the upper shell are open, the cover plate seals the opening of one end of the upper shell, which is far away from the lower shell, and one end of the upper shell, which is far away from the cover plate, is tightly pressed or just aligned with the lower shell; the lower shell comprises a lower shell, and the upper shell comprises an upper shell; two ends of each connecting rod are respectively provided with a first connecting rod pin, and the middle parts of the two connecting rods are hinged through a second connecting rod pin; a lower shell partition plate is arranged on the lower shell, and a lower shell partition plate groove is formed in the lower shell partition plate; an upper shell partition plate is arranged on the upper shell body, and an upper shell partition plate groove is formed in the upper shell partition plate; the lower shell partition plate groove and the upper shell partition plate groove are clamped with the first connecting rod pins at two ends of the two connecting rods respectively and can be assembled in a sliding mode.

2. The collapsible writing case of claim 1, further comprising: a lower shell sliding groove is formed in the lower shell, and an upper shell sliding groove is formed in the upper shell; be provided with the apron arch on the apron, be provided with the apron pivot in the apron arch, in upper shell spout, the inferior valve spout are packed into to apron pivot one card, and can rotate in order to cover the opening that the inferior valve one end was kept away from to the upper shell casing when the apron pivot is located the one end department that the upper shell spout kept away from the lower casing most.

3. The collapsible writing case of claim 2, wherein: the lower shell partition plate and the upper shell partition plate are respectively assembled and fixed with two ends of a first flexible sheet, and the first flexible sheet has elasticity; the first flexible sheet is closed at four sides and is open at two ends or at least one end far away from the lower shell is open.

4. The collapsible writing case of claim 2 or 3, wherein: the upper shell and the lower shell are positioned on the outer side of the connecting rod and are respectively assembled with two ends of a second flexible sheet, and the second flexible sheet has telescopic elasticity.

5. The collapsible writing case of claim 1, further comprising: the same ends of the two connecting rods which are hinged with each other are also respectively assembled with the two ends of the tension piece, the tension piece has elasticity, and the tension piece is used for generating elastic force which is close to the two connecting rods to rotate.

6. The collapsible writing case of claim 1, further comprising: a cover plate buckle is arranged on the cover plate, an upper shell locking groove is formed in the position, corresponding to the cover plate buckle, of the upper shell, and a buckle is arranged on the cover plate buckle and has elasticity; the buckle penetrates through the upper shell lock groove and then is tightly clamped with the end face of the upper shell, which is positioned on the inner side of the upper shell lock groove, so that the cover plate is tightly clamped on the upper shell.

7. The collapsible writing case of claim 1, further comprising: the upper shell is provided with locking assemblies, the locking assemblies are used for clamping corresponding first connecting rod pins, and the two locking assemblies are a pair of locking assemblies; each first connecting rod pin corresponds to one pair of locking assemblies; two first connecting rod pins at the same end respectively correspond to two pairs of different locking assemblies; the two locking assemblies in the same pair are respectively used for clamping the first connecting rod pins corresponding to the maximum and minimum time intervals between the upper shell and the lower shell; the locking assembly comprises a support, an upper locking frame and a sliding shaft, the support is mounted on the upper shell, and a support plate is arranged on the support; the support plate is assembled with one end of the sliding shaft, the other end of the sliding shaft penetrates through the stress plate and then is assembled with the shaft seat plate, the shaft seat plate is installed in the upper locking channel, and the upper locking channel penetrates through the upper shell; the stress plate is arranged on the upper lock frame, the upper lock frame is also provided with a locking push plate and a locking clamping plate respectively, and the locking clamping plate is provided with a locking groove which can be clamped and assembled with the first connecting rod pin; the part of the sliding shaft between the stress plate and the support plate is sleeved with a spring, and the spring applies elasticity for pushing the shaft seat plate to the upper locking frame, so that the upper locking clamping plate is in a state closest to the shaft seat plate in an initial state.

8. The collapsible writing case of claim 7, wherein: the locking push plates of the same pair of locking assemblies are respectively assembled with the same unlocking plate, the unlocking plates are arranged in unlocking grooves, and the unlocking grooves are formed in the upper shell; when the cover plate is tightly assembled with the upper shell, the unlocking plate and the locking push plate are shielded by the cover plate.

9. The collapsible writing case of claim 1, further comprising: the lower shell is provided with a lower shell retaining groove, the upper shell retaining groove is clamped with the corresponding first connecting rod pin and can be assembled in a sliding mode, and two ends of the first connecting rod pin are clamped between the inner wall of the lower shell retaining groove and the inner wall of the lower shell partition plate groove respectively.

10. The collapsible writing case of claim 1, further comprising: the cover plate is provided with a hand-held device, the hand-held device comprises an elastic belt, two ends of the elastic belt are respectively provided with a belt groove, the belt grooves are sleeved on a retaining pin, and the retaining pin is arranged on the cover plate; the elastic band has elasticity, and the elastic band is through self elasticity tiling on the apron during initial condition.

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