Cover sheets for flat boxes and flat boxes for which cover sheets are applicable

Abstract

To provide a cover for a flat box which eliminates the need to clean the inside of the flat box after use. [Solution] The cover sheet for the flat box consists of a long plastic film member having a bottom cover portion 11 and a lid cover portion 12, and is placed on the inner surface of the bottom and lid portion L of a flat box B which has a filling portion with a cavity C for filling a high-viscosity substance P and a lid portion L, the width dimensions of the bottom cover portion 11 and the lid cover portion 12 being approximately the same as the width dimensions of the bottom and lid portion L, respectively, preventing the high-viscosity substance contained in the cavity C from coming into direct contact with the bottom and lid portion L, and allowing it to be used without physically obstructing the rotation of the lid portion L of the flat box B or the discharge flow path for the high-viscosity substance, and making it easy to remove from the flat box B together with any remaining high-viscosity substance after use.

Description

[Technical Field]

[0001] The present invention relates to a cover sheet for a flat box and a flat box to which the cover sheet is applied. [Background technology]

[0002] Conventionally, flat boxes are used at construction sites to fill the joints of multiple gypsum boards installed on walls and ceilings with putty. This flat box is filled with putty, and when a certain amount of putty is pushed out from the inside while sliding along the joints of the gypsum boards, the putty is molded into a certain shape according to the shape of the opening of the flat box, filling the joints of the gypsum boards.

[0003] Furthermore, by using the flat box, workers can work without coming into direct contact with the putty and without getting their hands dirty, and they can also extend the handle to work on joints of gypsum boards installed in hard-to-reach places such as ceilings (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent No. 5,137,386 Summary of the Invention [Problem to be solved by the invention]

[0005] After use, flat boxes like the one described above needed to be cleaned to remove any putty remaining inside. Furthermore, cleaning the inside of the flat box caused problems, such as the cleaning water and residue splashing around and polluting the work environment. Furthermore, the cleaning process itself required time and effort, reducing work efficiency.

[0006] The present invention was made in consideration of the above situation, and the problem that the present invention aims to solve is to provide a cover sheet that can be placed inside a flat box so that the inside of the flat box does not need to be cleaned after use. [Means for solving the problem]

[0007] Below, we will explain means for solving the above problems.

[0008] (1) A cover sheet for a flat box that is detachably fixed inside a flat box, the flat box comprising: a filling section having a cavity for filling a high-viscosity substance therein; a lid section rotatably connected to the filling section; and a connecting shaft connecting the filling section and the lid section; the filling section comprising a bottom section, a pair of side sections provided opposite each other at both ends of the bottom section, and a curved section provided at the tip of the bottom section to connect the ends of the pair of side sections; the inner surface of the curved section is formed as an arc-shaped curved surface that follows the rotation path of the tip of the lid section when it rotates on the connecting shaft; the tip of the bottom section has a notch cut inward relative to the outer periphery of the bottom section; the pair of side sections, the curved section, and the bottom section form the cavity; the lid section is provided on the open surface of the filling section and is connected to the connecting shaft; a cover sheet for a flat box, the cover sheet being rotatably connected to the filling portion by a plastic film having one side and another side, the cover sheet being configured such that, as the cover sheet rotates, the outer edge of the cover sheet displaces along a surface formed by the continuous inner surfaces of the pair of side portions and the inner surface of the curved portion, bringing the cover sheet and the bottom portion closer together and forcing the high-viscosity substance filled in the cavity out of the cutout portion; the cover sheet being formed as a long plastic film member having one side and another side, the cover sheet being provided with a bottom cover portion covering the inner surface of the bottom portion and a lid cover portion covering the inner surface of the lid portion, the one side being fixed by at least a portion of the inner surfaces of the bottom and the lid portion, the bottom width dimension which is the width dimension of the inner surface of the bottom portion and a first dimension which is the width dimension of the bottom cover portion being approximately equal, and the lid width dimension which is the width dimension of the inner surface of the lid portion and a second dimension which is the width dimension of the lid cover portion being approximately equal.

[0009] (2) A cover sheet for a flat box as described in (1), in which the width dimension obtained by adding together the third dimension, which is the front-to-back width dimension of the bottom cover portion, and the fourth dimension, which is the front-to-back width dimension of the lid cover portion, is greater than or equal to the width dimension obtained by adding together the front-to-back width dimension of the inner surface of the bottom portion and the front-to-back width dimension of the inner surface of the lid portion.

[0010] (3) A cover sheet for a flat box as described in (1), in which at least a portion of the tip of the bottom cover portion is formed in a shape that matches the shape of the cutout portion.

[0011] (4) A cover sheet for a flat box according to (1), in which a notch is formed on the side of the bottom cover part.

[0012] (5) A cover sheet for a flat box as described in (1), in which rubber pieces are provided along the outer edge of the lid portion, and the second dimension is smaller than the first dimension and is the width dimension of the lid portion minus the width dimension of the rubber pieces provided at both ends of the lid portion.

[0013] (6) A cover sheet for a flat box according to (1), wherein double-sided tape is provided on the one side.

[0014] (7) A flat box in which the cover sheet for the flat box described in (1) to (6) is removably fixed to the inner surface of the internal filling section and the lid section, and the fixation is released by pulling the lid cover section when the lid section is open. [Effects of the Invention]

[0015] The flat box cover sheet of the present invention has the advantage that it is not necessary to clean the inside of the flat box after use. [Brief explanation of the drawings]

[0016] [Figure 1]1 is a perspective view of a flat box equipped with a flat box cover sheet according to an embodiment of the present invention when in use. [Figure 2] 1 is a perspective view showing a flat box to which a flat box cover sheet according to an embodiment of the present invention is applied; [Figure 3] 1 is a perspective view showing an open state of a flat box to which a flat box cover sheet according to an embodiment of the present invention is applied. [Figure 4] FIG. 2 is a front view showing the flat box cover sheet according to the embodiment. [Figure 5] 10 is an enlarged view of a main part showing the attachment of the bottom cover part of the flat box cover sheet to the bottom of the flat box according to this embodiment. FIG. [Figure 6] 10 is an enlarged view of a main part showing the attachment of the lid cover part of the flat box cover sheet of this embodiment to the lid part of the flat box. FIG. [Figure 7] 1 is a cross-sectional view showing a flat box to which a flat box cover sheet according to an embodiment of the present invention is attached. [Figure 8] 1 is a perspective view showing an open state of a flat box to which a flat box cover sheet according to this embodiment is attached. [Figure 9] 1 is an enlarged view showing the open state of the flat box cover sheet attached to the flat box cover sheet according to the present embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] First, a flat box B to which a cover sheet for a flat box (hereinafter simply referred to as a "cover sheet") 10 according to this embodiment of the present invention is applied will be described using Figure 1. The cover sheet 10 according to this embodiment is attached to the flat box B for use.

[0018] 1 and 3, flat box B includes a filling section F having a cavity C therein for filling with a high-viscosity substance P, a lid section L rotatably connected to filling section F, and a connecting shaft A connecting section F to lid section L. As flat box B slides along the wall surface, lid section L applies a constant pressure to the high-viscosity substance P contained inside and pushes it outward, thereby applying a constant thickness of high-viscosity substance P to the wall surface. In this embodiment, the front and rear shown in FIG. 2 will be described as the front and rear of flat box B.

[0019] The high viscosity substance P in this invention includes putty, filler, finishing material, etc., and is a paste-like material used to fill holes, depressions, joints in plasterboard, etc., and is applied to wall or ceiling surfaces.

[0020] 3, the filling section F of the flat box B to which the cover sheet 10 according to this embodiment is applied comprises a bottom F1, a pair of side sections F2·F2 disposed opposite each other at both ends of the bottom F1, and a curved section F3 disposed at the tip of the bottom F1 and connecting the ends of the pair of side sections F2·F2. In the filling section F of the flat box B thus formed, a cavity C is formed by the bottom F1, the pair of side sections F2·F2, and the curved section F3. The cavity C is a space for containing a high-viscosity substance P.

[0021] 3, in the filling section F of the flat box B, the inner peripheral surface of the curved portion F3 is formed as an arc-shaped curved surface that follows the rotation trajectory of the tip of the lid portion L when it rotates around the connecting shaft A. As a result, when the lid portion L rotates, the outer edge of the lid portion L moves while remaining in close contact with the inner peripheral surface of the curved portion F3.

[0022] 3, a notch F4 is formed at the tip of the bottom F1 in the filling section F of the flat box B, the notch F4 being cut inward relative to the outer periphery of the bottom F1. With this configuration, the filling section F of the flat box B can maintain the high-viscosity substance contained in the cavity C, and can also discharge the high-viscosity substance P contained therein through the notch F4 by pressing the lid L.

[0023] 2 and 3, the lid portion L of the flat box B to which the cover sheet 10 of this embodiment is applied is provided on the open surface of the filling portion F and is rotatably connected to the filling portion F by a connecting shaft A. The lid portion L of the flat box B is configured to automatically rotate in the opening direction by an elastic member L2, and a spring is used as the elastic member L2 of the flat box B to which the cover sheet 10 of this embodiment is applied.

[0024] In the flat box B configured as described above, the elastic member L2 maintains a state in which the expansion and contraction force is accumulated when the lid L is in the closed position. When the closed position of the lid L is released, the expansion and contraction force of the spring automatically pushes the lid L in the opening direction. This allows the lid L to open automatically without the user having to manually open the lid.

[0025] 3, the lid L of the flat box B is rotatably connected to the filling section F via a connecting shaft A, and the lid L can be opened to widely expose the internal space of the filling section F. Furthermore, by rotating the lid L to widely open the flat box B, it becomes easy to fill the cavity C with a high-viscosity substance P.

[0026] As shown in Figures 2 and 3, the filling section F of the flat box B is provided with a fastener F11 that can rotate around a rotatable axis near the open surface, and the fastener F11 has a shape that protrudes on the rotation path of the lid section L.

[0027] The fastener F11 of the flat box B to which the cover sheet 10 according to this embodiment is applied interferes with the outer edge of the lid L when the lid L is closed, thereby physically preventing the lid L from rotating in the opening direction due to the elastic member L2. On the other hand, when the user rotates the fastener F11 to a position where it does not obstruct the rotation path of the lid L, the fastener F11 of the flat box B can transition to a form that does not interfere with the rotation of the lid L.

[0028] As shown in Figures 2 and 3, the fastener F11 of the flat box B to which the cover sheet 10 of the embodiment is applied allows the user to switch the lid portion L of the flat box B from a closed state to an open state simply by rotating the fastener F11.

[0029] When the lid L of the flat box B is pushed toward the bottom F1, it rotates about the connecting shaft A, and the outer edge of the lid L is displaced along the surface formed by the inner surfaces of the pair of side portions F2·F2 and the inner surface of the curved portion F3. With this configuration, as the lid L rotates, the lid L and the bottom F1 approach each other, and the high-viscosity material P filled in the cavity C is pressed and forced out through the notch F4.

[0030] With this configuration, in a flat box B containing a high-viscosity substance P, when the lid portion L is rotated, no gap is created between the outer edge of the lid portion L and the inner surface of the curved portion F3, so the high-viscosity substance P pressed against the lid portion L is reliably pushed out toward the cutout portion F4 without escaping into the gap.

[0031] As shown in Figure 1, the flat box B has a sliding structure, and when it is slid along the joints of multiple gypsum boards installed on a wall surface, it can extrude high-viscosity substance P from the cutout portion F4 and apply the high-viscosity substance P evenly along the joints of the boards.

[0032] 2, the flat box B includes a forming bar F5 located near the notch F4 at a position connecting the pair of side portions F2. The forming bar F5 is made of a metal material, such as stainless steel, that has appropriate rigidity and wear resistance, and is formed in a long rod shape.

[0033] The shaping bar F5 allows the high-viscosity substance P extruded from the cavity C to be applied to the wall surface while being shaped to a uniform width and thickness when the flat box B is slid along the wall surface. As a result, it becomes possible to easily apply the high-viscosity substance P uniformly to the wall surface.

[0034] Furthermore, as shown in FIG. 2, the flat box B includes a pair of pressing members F6·F6 for appropriately pressing the forming bar F5, a pressing plate F7 for simultaneously applying pressure to the pressing members F6, and a dial F8 for adjusting the pressing force applied to the pressing plate F7.

[0035] With this configuration, the user can adjust the pressing force applied to the forming bar F5 by operating the dial F8, and the flat box B can select and apply an appropriate forming pressure depending on various wall surfaces and various high-viscosity substances P.

[0036] As shown in Figure 1, the flat box B is used with an operating rod R attached that presses the lid L. As shown in Figures 1 and 3, when the operating rod R presses the lid L toward the bottom F1, the lid L rotates around the connecting shaft A. At this time, the high-viscosity substance P contained inside the filling section F is pressed by the lid L, and begins to be discharged to the outside through the cutout F4.

[0037] Furthermore, when the pressure applied to the lid L by the operating rod R is released, the elastic force of the elastic member L2 provided on the lid L acts in a direction that automatically rotates the lid L back to its original position. This releases the pressure applied to the high-viscosity substance P by the lid L, and discharge ends. Therefore, in the flat box B to which the cover sheet 10 according to this embodiment is applied, the user can easily control the start and end of discharge of the high-viscosity substance P by operating the operating rod R.

[0038] Next, a cover sheet 10 according to this embodiment of the present invention will be described with reference to Figures 1 and 4. The cover sheet 10 according to this embodiment is used by being detachably fixed inside a flat box B.

[0039] As shown in FIG. 4, the cover sheet 10 according to this embodiment is formed as a long plastic film member having a first surface 10f and a second surface 10r, and is made of a flexible material.

[0040] 4, the width dimension of the cover sheet 10 according to this embodiment is composed of a first dimension H1, which is the width dimension of the bottom cover portion 11, and a second dimension H2, which is the width dimension of the lid cover portion 12. The width dimension in the front-to-rear direction of the cover sheet 10 is composed of a third dimension H3, which is the width dimension in the front-to-rear direction of the bottom cover portion 11, and a fourth dimension H4, which is the width dimension in the front-to-rear direction of the lid cover portion 12.

[0041] In the cover sheet 10 configured in this manner, the bottom cover portion 11 covers the inner surface of the bottom portion F1 and is disposed along the inner surface of the bottom portion F1, as shown in Fig. 5. Furthermore, in the cover sheet 10, the lid cover portion 12 covers the inner surface of the lid portion L and is disposed along the inner surface of the lid portion L, as shown in Fig. 6.

[0042] 7, the cover sheet 10 is attached so that the third dimension H3 of the bottom cover part 11 coincides with the front-to-rear direction of the flat box B in accordance with the positional relationship between the bottom part F1 and the lid part L, and the front-to-rear direction of the lid cover part 12 is bent from the bottom cover part 11. This enables the cover sheet 10 to cover the bottom part F1 and the lid part L that come into contact with the high-viscosity substance P inside the flat box B.

[0043] With such a cover sheet 10, when a high-viscosity substance P is stored in the flat box B, it is possible to store the high-viscosity substance P without it directly adhering to the inner surface of the bottom F1 and lid L of the flat box B. Furthermore, after work is completed, any high-viscosity substance P remaining inside the flat box B can be easily removed simply by removing the cover sheet 10 from inside the flat box B, eliminating the need to clean the inside of the main body.

[0044] The cover sheet 10 of this embodiment is configured to cover the inner surfaces of the bottom F1 and lid L of the flat box B using the bottom cover portion 11 and lid cover portion 12, but is not provided in the areas corresponding to the pair of side portions F2·F2.

[0045] The reason why no cover sheet 10 is provided in the areas corresponding to the pair of side portions F2 is that, due to the configuration of the flat box B, when the lid portion L rotates around the connecting axis A and is pushed toward the bottom portion F1, the outer edge of the lid portion L moves smoothly along the inner surface of the side portion F2 while approaching it, thereby reliably compressing and pressing the high-viscosity substance P contained inside the cavity C.

[0046] This rotation mechanism presses the high-viscosity substance P contained inside the cavity C toward the bottom F1 in accordance with the movement of the lid L. As shown in Figure 3, a flat box B to which the cover sheet 10 according to this embodiment is applied has a rubber piece L1 provided along the outer edge of the lid L. The rubber piece L1 is made of a flexible material having elasticity, and is configured to come into close contact with the inner wall of the filling section F, particularly the inner surface of the side section F2, when the lid L rotates around the connecting axis A.

[0047] With this configuration, there is almost no gap between the outer edge of the lid portion L and the inner surface of the side portion F2, so that in a flat box B containing a high-viscosity substance P inside, when the lid portion L rotates toward the bottom portion F1, the rubber piece L1 slides along the inner surface of the side portion F2, reliably scraping off the high-viscosity substance P and pushing it toward the bottom portion F1 without remaining on the side portion F2.

[0048] As a result, the high-viscosity substance P rarely remains on the inner surface of the side portion F2 after the lid portion L is rotated, which reduces the need to clean the side portion F2 after use. Therefore, there is no need to provide a cover sheet in the area corresponding to the side portion F2, and the cover sheet 10 according to this embodiment simplifies the structure while eliminating the need to clean the flat box B.

[0049] 5, in the cover sheet 10 according to this embodiment, at least a portion of the tip of the bottom cover portion 11 is formed in a shape that matches the shape of the notch portion F4. As a result, even when the cover sheet 10 is attached to the flat box B, the end of the cover sheet 10 does not cover the notch portion F4 and block the passage, ensuring a discharge path for the high-viscosity substance P.

[0050] Therefore, when the cover sheet 10 of this embodiment is attached to the flat box B, it can maintain the function of the flat box B without physically hindering the action of pushing out and discharging the high-viscosity substance P contained inside the flat box B.

[0051] After the cover sheet 10 according to this embodiment covers the bottom F1 and the inner surfaces of the lid L of the flat box B, the first surface 10f side is fixed to at least a portion of the inner surfaces of the bottom F1 and the lid L. Specifically, as shown in Fig. 4, the cover sheet 10 according to this embodiment has double-sided tape 13 provided on the first surface 10f side, and as shown in Figs. 8 and 9, one adhesive surface of the double-sided tape 13 is adhered to the cover sheet 10, and the other adhesive surface is adhered to the inner surfaces of the bottom F1 and the lid L of the flat box B, thereby making it possible to detachably fix the cover sheet 10 to the flat box B.

[0052] The material of the double-sided tape 13 applied to the cover sheet 10 is not limited as long as it is a tape with adhesive surfaces on both sides. For example, the double-sided tape 13 may be made of a polyurethane material. When the cover sheet 10 is applied with the double-sided tape 13 made of a polyurethane material, the double-sided tape 13 is peeled off together with the cover sheet 10 when the cover sheet 10 is peeled off from the flat box B, so the cover sheet 10 can be attached and removed without soiling the flat box B.

[0053] The cover sheet 10 can be fixed to the flat box B at any point on the first surface 10f side, but it is preferable to fix the end of the cover sheet 10 because this makes it difficult for the high-viscosity substance P to be filled to enter the gap between the flat box B and the cover sheet 10.

[0054] By fixing the cover sheet 10 to the inner surfaces of the bottom F1 and the lid L in this way, it is possible to prevent the cover sheet 10 from shifting position or floating up inside the flat box B. Furthermore, since the position of the cover sheet 10 according to this embodiment is fixed inside the flat box B in this way, the cover sheet 10 maintains its position covering the bottom F1 and the lid L of the flat box B without unnecessarily deforming during the series of operations from when the high-viscosity substance P is placed inside the flat box B to when it is pressed by the lid L and discharged.

[0055] Such a cover sheet 10 has sufficient resistance to the pressure generated by the rotation of the lid portion L and the flow of the high-viscosity substance P, and can maintain its attached position on the bottom portion F1 and the lid portion L even during the application operation.

[0056] 5, in the cover sheet 10 according to this embodiment and the flat box B to which the cover sheet 10 is applied, the bottom width dimension H5, which is the width dimension of the inner surface of the bottom F1 of the flat box B, is approximately the same as the first dimension H1, which is the width dimension of the bottom cover part 11. With this configuration, when attaching the cover sheet 10 to the inner surface of the bottom F1, both side edges of the bottom cover part 11 naturally match both side edges of the inner surface of the bottom F1, making alignment easy.

[0057] Furthermore, in the cover sheet 10 according to this embodiment and the flat box B to which the cover sheet 10 is applied, the bottom width dimension H5 and the first dimension H1 are substantially the same, so that the cover sheet 10 is less likely to shift position after being attached to the flat box B, and the cover sheet 10 can maintain a stable attachment state to the flat box B. As a result, even when the high-viscosity substance P moves in the cavity C of the flat box, the cover sheet 10 is securely held without shifting position from the bottom F1, making it possible to prevent leakage of the high-viscosity substance P to the bottom F1 and deformation of the cover sheet 10.

[0058] 6, in the cover sheet 10 according to this embodiment and the flat box B to which the cover sheet 10 is applied, the lid width dimension H6, which is the width dimension of the inner surface of the lid portion L of the flat box B, is approximately the same as the second dimension H2, which is the width dimension of the lid cover portion 12. With this configuration, when the cover sheet 10 is attached to the inner surface of the lid portion L, the side edges of the lid cover portion 12 naturally match the side edges of the inner surface of the lid portion L, making alignment easy.

[0059] According to this configuration, the cover sheet 10 is integrally provided with a bottom cover portion 11 corresponding to the bottom portion F1 and a lid cover portion 12 corresponding to the lid portion L, and is designed so that by bonding them together starting from the bottom portion F1, they will naturally align with the lid portion L.

[0060] As shown in Fig. 4, in the cover sheet 10 according to this embodiment, the second dimension H2 is smaller than the first dimension H1. This is because, as shown in Fig. 6, the second dimension H2 is the width dimension of the lid portion L itself minus the width dimension of the rubber pieces L1 provided on both ends of the lid portion L. With this configuration, the lid cover portion 12 of the cover sheet 10 is attached without covering the rubber pieces L1 provided on the lid portion L, and is formed to correspond to the lid portion width dimension H6.

[0061] 9, when the cover sheet 10 is attached to the flat box B, the second dimension H2 of the lid cover portion 12 fits accurately with the effective width of the inner surface of the lid portion L, making it possible to maintain a state in which the cover sheet 10 is less likely to float or become misaligned relative to the flat box B. Furthermore, the cover sheet 10 is positioned without physically interfering with the sealing properties of the rubber piece L1 positioned on the lid portion L, and can be used without the high-viscosity substance P leaking to the outside as the lid portion L rotates.

[0062] As shown in Fig. 4, in the cover sheet 10 according to this embodiment, a notch 14 is formed on the side of the bottom cover portion 11. As shown in Fig. 9, this notch 14 corresponds to the edge of the bottom portion F1 when the cover sheet 10 is attached to the flat box B. Therefore, when attaching the cover sheet 10 to the flat box B, the user can visually grasp the bending position of the cover sheet 10, and it becomes possible to prevent the attachment position of the cover sheet 10 relative to the flat box B from shifting or becoming distorted.

[0063] 9, the notches 14 in the cover sheet 10 according to this embodiment are provided along the folding direction of the cover sheet 10, thereby guiding the folding position of the cover sheet 10. This allows the user to easily recognize the folding position and fold and apply the cover sheet 10 in the correct position.

[0064] The flat box B to which the cover sheet 10 according to this embodiment is applied has a seventh dimension H7, which is the width dimension in the front-to-rear direction of the inner surface of the bottom portion F1, and an eighth dimension H8, which is the width dimension in the front-to-rear direction of the inner surface of the lid portion L. Specifically, as shown in FIG. 7 , the inner surface of the bottom portion F1 is composed of a flat surface F9 formed flat from the cutout portion F4 toward the rear, and an inclined surface F10 formed continuously from the flat surface F9 toward the connecting shaft A, and has a ninth dimension H9 and a tenth dimension H10, which are the width dimensions in the front-to-rear direction of each of these. The seventh dimension H7 is the sum of the ninth dimension H9 and the tenth dimension H10.

[0065] 4 and 7, in the cover sheet 10 according to this embodiment, the sum of the third dimension H3 and the fourth dimension H4 is formed to be a width dimension that is equal to or greater than the sum of the seventh dimension H7 and the eighth dimension H8 of the flat box B. Therefore, the cover sheet 10 according to this embodiment is formed so that its lateral dimension is approximately the same as the lateral dimension of the inner surface of the flat box B, but its front-to-rear dimension is equal to or greater than the front-to-rear dimension of the inner surface of the flat box B.

[0066] 8 and 9, the cover sheet 10 is formed to have such dimensions, so that it can cover the entire inner surface of the bottom F1 and lid L of the flat box B, preventing the high-viscosity substance P from coming into direct contact with the inner surface of the flat box B. As a result, there is no need to clean the flat box B body after use.

[0067] The cover sheet 10 according to this embodiment is attached to the flat box B by aligning the end of the bottom cover portion 11 with the notch F4 of the flat box B and adhering it in order from the bottom F1 toward the lid L. At this time, the sum of the third dimension H3 and the fourth dimension H4 is formed to be a width dimension equal to or greater than the sum of the seventh dimension H7 and the eighth dimension H8 of the flat box B, so that, as shown in FIG. 7, the cover sheet 10 has a structure in which a portion thereof protrudes outward from the outer edge of the lid L after being attached to the flat box B.

[0068] 8 and 9, the portion of the cover sheet 10 that protrudes outside the flat box B functions as a knob that the user can grip with their fingers when removing the cover sheet 10 from the flat box B. The cover sheet 10 according to this embodiment is removably fixed to the flat box B with double-sided tape 13, and the user can release the fixation between the cover sheet 10 and the flat box B by gripping the cover sheet 10 and pulling the lid cover portion 12 while the flat box B is open.

[0069] In this way, the cover sheet 10 according to this embodiment can be peeled off entirely from the flat box B, starting from the lid cover portion 12. Therefore, the cover sheet 10 according to this embodiment can be easily attached to and detached from the flat box B, and is peeled off as a single piece without any part remaining on the flat box B during the peeling operation.

[0070] With this configuration, the user can remove all of the high-viscosity substance P remaining inside the flat box B simply by removing the cover sheet 10 after work, eliminating the need to clean the inside of the flat box B. [Explanation of symbols]

[0071] 10 Cover Sheet 10f front 10r back 11 bottom cover part 12 lid cover part 13 Double-sided tape 14 Notch A Connecting shaft B Flat box C Cavity F Filled part F1 Bottom F2 Side F3 curved part F4 notch part F5 Forming bar F6 Pressing member F7 Pressure plate F8 Dial F9 Flat surface F10 Slanted surface F11 Fastener L Lid L1 Rubber piece L2 Elastic member R Control rod P High viscosity material H1 First dimension H2 Second dimension H3 Third dimension H4 Fourth dimension H5 Bottom width H6 Lid width H7 Seventh dimension H8 Eighth dimension H9 ninth dimension H10 tenth dimension

Claims

1. A cover sheet for a flat box that is detachably fixed to the inside of a flat box, The flat box includes a filling section having a cavity for filling a high-viscosity substance therein, a lid section rotatably connected to the filling section, and a connecting shaft connecting the filling section and the lid section, the filling portion includes a bottom portion, a pair of side portions provided opposite to each other at both ends of the bottom portion, and a curved portion provided at a tip end of the bottom portion and connecting the ends of the pair of side portions; an inner circumferential surface of the curved portion is formed as an arc-shaped curved surface that follows a rotation locus when the tip of the lid portion rotates about the connecting shaft, A notch is formed at the tip of the bottom portion, the notch being cut inward relative to the outer periphery of the bottom portion, the cavity is formed by the bottom portion, the pair of side portions, and the curved portion; The lid portion is provided on an open surface of the filling portion and is rotatably connected to the filling portion by the connecting shaft, the outer edge of the lid portion is displaced along a surface formed by the inner surfaces of the pair of side portions and the inner surface of the curved portion as the lid portion rotates, thereby bringing the lid portion and the bottom portion closer to each other and forcing the high-viscosity material filled in the cavity out of the notch portion; It is formed as a long plastic film member having one side and another side, a bottom cover portion that covers the inner surface of the bottom portion; a lid cover portion that covers the inner surface of the lid portion, the one surface side is fixed to at least a part of the inner surfaces of the bottom portion and the lid portion, a bottom surface width dimension that is a width dimension of an inner surface of the bottom portion and a first dimension that is a width dimension of the bottom cover portion are substantially the same, A cover sheet for a flat box, wherein the lid width dimension, which is the width dimension of the inner surface of the lid, and the second dimension, which is the width dimension of the lid cover, are approximately the same.

2. A cover sheet for a flat box as described in claim 1, wherein the width dimension obtained by summing the third dimension, which is the front-to-back width dimension of the bottom cover portion, and the fourth dimension, which is the front-to-back width dimension of the lid cover portion, is greater than or equal to the width dimension obtained by summing the front-to-back width dimension of the inner surface of the bottom portion and the front-to-back width dimension of the inner surface of the lid portion.

3. The cover sheet for a flat box according to claim 1 , wherein at least a part of the tip of the bottom cover part is formed in a shape that matches the shape of the notch part.

4. 2. The cover sheet for a flat box according to claim 1, wherein a notch is formed in a side of the bottom cover part.

5. A cover sheet for a flat box as described in claim 1, wherein rubber pieces are provided along the outer edge of the lid portion, and the second dimension is smaller than the first dimension and is the width dimension of the lid portion minus the width dimension of the rubber pieces provided at both ends of the lid portion.

6. The flat box cover sheet according to claim 1 , wherein a double-sided tape is provided on said one surface.

7. The flat box according to any one of claims 1 to 6, wherein the cover sheet is detachably fixed to the inner surface of the filling section and the lid section, The flat box is released from its fixed state by pulling the lid cover portion when the lid portion is open.

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