Opening tool

Abstract

To provide an opening tool capable of reliably and easily opening an envelope or bag regardless of its thickness or hardness.SOLUTION: An opening tool has a base portion and a cutter holding portion. The cutter holding portion has a holding plate consisting of a horizontal plate and a vertical plate, a pressing plate arranged parallel to the vertical plate, and a first cutter clamping block and a second cutter clamping block clamped between the vertical plate and the pressing plate. The first cutter clamping block and the second cutter clamping block each have cutter clamping surfaces for clamping and holding a cutter, which are parallel and opposed to each other. The cutter holding portion and the base portion are connected so as to be able to open and close, and in a closed state, are connected so that the cutting edge of the cutter reaches into the hole in the base.SELECTED DRAWING: Figure 1

Description

Technical Field

[0005] , , ,

[0001] The present invention relates to an opener used for opening envelopes, food bags, and the like.

Background Art

[0002] Envelopes are often opened using a paper knife, cutter, scissors, etc. Also, for opening food bags, there are methods such as pulling both sides forming the bag to open from the joint, pulling the upper and lower parts of a cut provided in a part of the bag to open from this cut, and the like.

[0003] Recently, envelopes have diversified, and envelopes made of thick and hard materials or envelopes with the opening part firmly glued are used. Especially for commercial envelopes, those with a large size made of thick and hard materials are frequently used. To open such envelopes using a paper knife, cutter, or scissors, a large force is required, and the work burden becomes large when opening a large number of envelopes. Also, when using a cutter and extending the blade tip for work, the blade tip may break, which is dangerous.

[0004] Regarding food bags as well, the outer bags of foods such as confectionery are often relatively thick, and as bags for retort foods, those with a hard and thick aluminum layer are frequently used. Therefore, a large force is required for opening, and the work burden of opening often becomes a problem. Also, it is difficult for elderly people living alone to open them by themselves. Therefore, there is a need for an instrument (opener) that anyone can use to safely and easily open a large number of envelopes and food bags.

[0005] For example, Patent Document 1 discloses an opening tool in which a cutter is attached at an angle to a main body with a U-shaped cross-section so that there are guide walls in three directions, and an envelope is slid into the U-shaped space and opened with the blade of the cutter that protrudes from above into this space. In this opening tool, the width of the U-shaped space is made large enough to allow even thick envelopes to slide through, and a leaf spring is provided on the bottom surface of the U-shaped space to press the envelope against the top surface in order to ensure that the cutter blade protruding from above cuts the envelope reliably.

[0006] However, with the opening device described in Patent Document 1, depending on the thickness and stiffness of the envelope, the leaf spring may not be able to sufficiently press the envelope against the upper surface of the U-shaped space, or conversely, it may be difficult to pass the envelope between the leaf spring and the upper surface of the U-shaped space. As a result, it is not possible to open the envelope reliably, and it is inconvenient to use.

[0007] While various other opening tools are available and sold, ranging from electrically powered, palm-sized devices to large-scale machines for mass processing, they have been unable to cope with the increasing diversity in thickness and hardness of envelopes and food bags in recent years, and have not been satisfactory as tools that can reliably and easily open envelopes and food bags. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Utility Model Publication No. 7-2095 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention aims to provide an opening tool that can reliably and easily open envelopes, food bags, and other items to be opened, regardless of their thickness or hardness. [Means for solving the problem]

[0010] The inventors of the present invention have conducted diligent studies to solve the above problems, If an opening device comprises a base for placing and sliding items to be opened, such as envelopes or food bags, and a cutter holder for stably fixing and holding a cutter (meaning a device consisting of a blade and a member for holding the blade; the same applies hereinafter), and the cutter holder and the base are joined so as to be openable and closable, and a hole is provided in the base into which the tip of the cutter blade held in the cutter holder can be inserted when the cutter holder and base are closed, We discovered that an object to be opened can be reliably opened by a simple operation of placing the object to be opened between the base and the cutter holder, and sliding the object while applying pressure between the base and the cutter holder with your fingers, and thus completed the present invention. In other words, the above problem of the present invention is achieved by an opening tool with the configuration shown below.

[0011] The first aspect of this invention is, It has a base portion having a flat top surface and a hole opening in the top surface, and a cutter holder portion for holding the cutter, The cutter holding section comprises a holding plate consisting of a horizontal plate and a vertical plate perpendicular to the horizontal plate, a retaining plate arranged parallel to the vertical plate and at a predetermined interval, and a first cutter clamping block and a second cutter clamping block that are sandwiched and fixed between the vertical plate and the retaining plate. The first cutter clamping block and the second cutter clamping block each have cutter clamping surfaces that clamp and hold a cutter, facing each other with a gap between them for holding the cutter. The cutter holder and the base are connected in such a way that they can be opened and closed, allowing a transition between a closed state in which the lower surface of the horizontal plate and the upper surface of the base are in close contact and an open state in which they are separated. The opening device is characterized in that, in the closed state, the cutting edge of the cutter held in the cutter holding part reaches into the hole formed in the base part. [Effects of the Invention]

[0012] The opening tool of the present invention opens an envelope or food bag, or other item to be opened, by placing it between a cutter holder and a base and pressing them together while sliding either the cutter holder or the item to be opened. The opening tool of the present invention allows the object to be opened to be held between a cutter holder and a base, which are joined together by a hinge or the like so as to be openable and closable. Therefore, even if the object to be opened is thick, it can be held between them, and the object to be opened can be opened by sliding the cutter holder or the object to be opened while pressing the cutter holder, the object to be opened, and the base together. When the cutter holder and base are open, the position of the object to be opened, which is placed on the base, can be easily adjusted so that the tip of the cutter blade is at the desired opening position.

[0013] The cutter holder, base, and object to be opened are pressed together with the cutter holder and / or base closed. By adjusting the pressing force, the object to be opened can be firmly gripped between the cutter holder and base, ensuring that even thick or hard objects can be opened reliably. Furthermore, if this pressing is done by hand, the pressing force can be easily adjusted according to the thickness and hardness of the object to be opened, ensuring that even thick or hard objects can be opened reliably and easily.

[0014] Furthermore, by holding the opening tool of the present invention in one hand and performing the opening and closing of the cutter holder and base, as well as the above-mentioned pressure application, with the fingers, it is possible to perform the next opening operation without removing the opening tool from the hand after the first opening operation is completed. In other words, there is no need to remove the opening tool from the hand after each operation, and a large number of items to be opened can be opened smoothly and continuously, improving the efficiency of the opening work. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view showing one embodiment of the opening device of the present invention. [Figure 2] This is a perspective view showing one embodiment of the opening device of the present invention. [Figure 3]A partial cross-sectional view showing the cutting edge 41 of the cutter 4 and its periphery in one embodiment of the opener of the present invention. [Figure 4] A schematic perspective view schematically showing an example of the operation of opening an object to be opened with the opener of the present invention. [Figure 5] A perspective view or a plan view showing (a) a holding plate, (b) a pressing plate, (c) a first cutter holding block, and (d) a second cutter holding block used in one embodiment of the opener of the present invention. [Figure 6] A schematic perspective view schematically showing the open state of one embodiment of the opener of the present invention.

Mode for Carrying Out the Invention

[0016] Hereinafter, specific embodiments for carrying out the present invention will be described, but the scope of the present invention is not limited to the following specific embodiments.

[0017] The opener of the present invention includes a pedestal portion on which an object to be opened is placed during opening, and a cutter holding portion for stably holding and fixing a cutter during opening, and the pedestal portion and the cutter holding portion are joined so as to be openable and closable.

[0018] The pedestal portion has a flat upper surface on which the object to be opened is placed and which is in close contact with the lower surface of the horizontal plate of the cutter holding portion when the pedestal portion and the cutter holding portion are in the closed state. Further, on the upper surface of the pedestal portion, a hole (or an opening surface where the cutting edge of the cutter reaches) into which the cutting edge of the cutter held by the cutter holding portion is inserted is formed when in the closed state.

[0019] The hole may be a through hole penetrating from the upper surface to the lower surface of the pedestal portion. In the case of a through hole, since there is a risk that the cutting edge of the cutter may approach or protrude from the lower surface of the pedestal portion and cut the finger pressing the lower surface side, it is preferable to provide a protective tool (cutting edge covering member) that covers the opening on the lower surface side and covers the cutting edge.

[0020] Preferably, the lower surface of the base portion has two or more legs that are erected substantially perpendicular to the upper surface of the base portion, spaced apart from each other so that fingers can be inserted. By providing two or more legs that are erect substantially perpendicular to the lower surface of the base portion, spaced apart from each other so that fingers can be inserted, a gap is formed between the opening / closing device of the present invention and the table (table) when the table (table) or the like is placed on it, so that fingers can be inserted. As a result, when opening the device, it becomes easier to insert fingers into the space on the lower surface of the base portion while the base portion is still on the table (table) or the like, making the opening operation easier. Also, if the hole is a through hole, the tip of the cutter inserted into the hole in the base portion does not have to touch the table. The base portion may have a U-shaped cross-section with the legs provided at both ends.

[0021] The cutter holding section includes a holding plate consisting of a horizontal plate and a vertical plate, and a retaining plate that is parallel to and opposite the vertical plate and arranged at a predetermined distance apart. The horizontal plate of the retaining plate is the plate whose lower surface is in close contact with the upper surface of the base when the cutter retaining part and the base part are in a closed state. When opening an item to be opened, the item is held between the lower surface of the horizontal plate and the upper surface of the base part. These are then pressed together, and the item to be opened is slid on the upper surface of the base part, causing the item to be cut by the tip of the cutter blade and thus opened.

[0022] A vertical plate is a plate erected approximately vertically on the horizontal plate. The horizontal plate and the vertical plate may be formed and assembled separately, but it is preferable to form them as a single integrated component, as this simplifies the production of the retaining plate. The retaining plate may be an L-shaped retaining plate with the vertical plate erected at one end of the horizontal plate, or a T-shaped retaining plate with the vertical plate erected at a predetermined position within the upper surface of the horizontal plate.

[0023] The retaining plate is positioned such that its surface (plate surface) is substantially parallel to the vertical plate (the surface perpendicular to the horizontal plate), and that there is a predetermined distance between the plate surface and the surface of the vertical plate on the retaining plate side. Here, the predetermined distance corresponds to the thickness of the cutter, and also to the thickness of the first cutter clamping block and the second cutter clamping block, which will be described later.

[0024] A first cutter clamping block and a second cutter clamping block are positioned between the retaining plate and the vertical plate. The first cutter clamping block and the second cutter clamping block have cutter clamping surfaces that are parallel to each other and face each other, so that the cutter can be held perpendicular or at an angle to the joint surface between the cutter holding portion and the base portion when the two portions are closed. The cutter is held so that its cutting edge is parallel to the joint between the cutter holding portion and the base portion. Specifically, the first cutter clamping block and the second cutter clamping block each have a cutter clamping surface, and are clamped and fixed between the retaining plate and the vertical plate such that their respective cutter clamping surfaces are substantially parallel to each other and a gap is created between the cutter clamping surfaces to clamp and hold the cutter. The cutter is inserted into the space formed by the cutter clamping surface of the first cutter clamping block, the cutter clamping surface of the second cutter clamping block, the plate surface of the retaining plate, and the plate-side surface of the vertical plate, thereby fixing the position of the cutter relative to the cutter holding portion.

[0025] To ensure that the cutter is securely fixed in place relative to the cutter holder, it is preferable that an elastic layer acting as an anti-slip sheet is provided on at least one of the cutter clamping surfaces of the first cutter clamping block and the second cutter clamping block to prevent the cutter from slipping. The elasticity of the elastic layer further secures the position of the cutter. More preferably, the elastic layer is provided on the cutter clamping surfaces of both the first cutter clamping block and the second cutter clamping block, which further ensures that the position of the cutter is securely fixed.

[0026] The thickness of the elastic layer, the shape of its surface, and the forming material are not particularly limited as long as the cutter's position can be reliably fixed. However, silicone rubber is preferred as the forming material from the viewpoint of durability and chemical stability.

[0027] The relative positions of the retaining plate, the pressing plate, the first cutter clamping block, and the second cutter clamping block are fixed so that the space into which the cutter is inserted does not change (deform) during opening. One method for fixing the relative positions is to fasten screws from the retaining plate side and the pressing plate side, with screws passing through the retaining plate, the first cutter clamping block or the second cutter clamping block, and further through the pressing plate. As for the fixing method, it is also conceivable that one of the first cutter clamping block or the second cutter clamping block is fixed to a predetermined position on either the holding plate or the retaining plate by adhesive or the like, or that one of the first cutter clamping block or the second cutter clamping block is formed integrally with the holding plate or the retaining plate.

[0028] Preferably, at least one of the first cutter clamping block and the second cutter clamping block is formed so that its fixed position can slide in a direction parallel to the upper surface of the base. By making its fixed position slidable in a direction parallel to the upper surface of the base, the distance between the cutter clamping surfaces of the first cutter clamping block and the second cutter clamping block can be varied and adjusted to be applicable to cutters of various sizes (widths). In addition, by sliding the cutter after inserting it into the space, the installation and fixing of the cutter's position becomes easier. Both the first cutter clamping block and the second cutter clamping block may be formed to be slidable, and both may be slidable. However, in this case, the configuration of the opening and closing mechanism becomes complex, and the operation to adjust the gap between the cutter clamping surfaces may also become complicated. Therefore, it is preferable to have only one of them slide.

[0029] One method for forming the aforementioned fixed position so that it can slide in a direction parallel to the upper surface of the base is to make a wide hole (position adjustment hole) in the cutter clamping block that extends horizontally to the upper surface of the base. After passing a screw for fixing the cutter clamping block, etc., through the position adjustment hole, the cutter clamping block is slid along the upper surface of the base in accordance with the width of the cutter with the screw loosened, and once the position is determined, the screw is tightened to fix the cutter clamping member, thereby fixing the cutter to the cutter holding part.

[0030] Preferably, the upper surface of the horizontal plate of the holding plate is provided with a finger insertion section for inserting a finger. Preferably, the finger insertion section is curved so that a finger can be inserted and loosely secured. Furthermore, by providing a finger insertion section and inserting one finger (for example, a thumb) into it, and placing the other fingers on the lower surface of the base, the cutter holding section and the base can be held with one hand, and the opening and closing of the cutter holding section and the base can be easily performed with the fingers, and an appropriate pressing force can be applied. As a result, a large number of items to be opened can be opened continuously and efficiently with one-handed operation.

[0031] The opening device of the present invention is characterized in that the cutter holding portion and the base portion are connected in a way that allows them to be opened and closed. That is, it is characterized in that it is formed so that it is possible to transition between a closed state in which the lower surface of the horizontal plate and the upper surface of the base portion are in close contact and an open state in which they are separated. As a method of connecting in a way that allows them to be opened and closed, a hinge (connection) is preferred for the connection between the cutter holding portion and the base portion.

[0032] When connected by a hinge, the hinge can be provided on any side between the cutter holder and the base, but it is preferable that the direction of the connection point be parallel to the cutting edge of the cutter.

[0033] In the opening device of the present invention, when the cutter holding portion and the base portion are in a closed state, the cutter is held in the cutter holding portion such that the tip of the cutter reaches into the hole in the base portion. By holding the cutter in this manner, the object to be opened can be reliably opened by sliding it on the base portion. The tip of the cutter reaching into the hole in the base portion means that the tip of the blade is below the opening surface of the hole (or the upper opening surface in the case of a through hole) (i.e., inside the hole), and the tip of the blade may be inserted deeper into the hole. [Examples]

[0034] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0035] Figure 1 shows one embodiment of the opening device of the present invention, as viewed from the retaining plate side. Figure 2 shows the same embodiment as Figure 1, but as viewed from the retaining plate side. Both figures show the closed state. In Figures 1 and 2, 1 represents the cutter holder, 2 represents the base, 3 represents the hinge connecting the cutter holder 1 and the base 2, and 4 represents the cutter held by the cutter holder 1. The cutter holder 1 consists of a holding plate 12 made up of a horizontal plate 13 and a vertical plate 14, a pressing plate 11, a first cutter clamping block 15, and a second cutter clamping block 16.

[0036] As shown in Figures 1 and 2, in this example, the vertical plate 14 is erected vertically at the end of the horizontal plate 13, and the retaining plate 12 is formed in an L-shape in cross-section. The retaining plate 11 is positioned parallel to and opposite the vertical plate 14, and the first cutter clamping block 15 and the second cutter clamping block 16 are clamped between the retaining plate 11 and the vertical plate 14. 17 in Figure 1 is an arc-shaped finger insertion part for inserting a finger. By inserting a finger into the finger insertion part 17 and pressing the upper surface 131 of the horizontal plate 13, the lower surface of the horizontal plate 13, the upper surface of the base part 2, and the object to be opened held between them can be pressed together with appropriate force.

[0037] The base portion 2 has legs 2b at both ends. That is, the base portion 2 has a U-shaped cross-section, consisting of an upper portion 2a that joins (in the closed state) with the lower surface of the horizontal plate 13 of the cutter holding portion 1, and legs 2b that are erected vertically downward from both ends of the upper portion 2a. By inserting one finger (for example, a thumb) into the finger insertion section 17 and placing the other finger on the lower surface 2c of the U-shaped base section 2, and pressing the upper surface 131 of the horizontal plate 13 and the lower surface 2c of the base section 2 with the finger, the lower surface of the horizontal plate 13, the upper surface of the base section 2, and the object to be opened 7 held between them can be pressed together with appropriate force. Figure 4 is a schematic perspective view illustrating how the object to be opened 7 is held between the lower surface of the horizontal plate 13 and the upper surface of the base section 2, and how the lower surface of the horizontal plate 13, the object to be opened 7, and the upper surface of the base section 2 are pressed together by a finger 8 pressing the upper surface 131 of the horizontal plate 13 and the lower surface 2c of the base section 2, and how the object to be opened 7 is opened by sliding it in the direction of the arrow in the figure.

[0038] In the example shown in Figures 1 and 2, screw holes are formed through the vertical plate 14, the retaining plate 11, and the first cutter clamping block 15. Screws are inserted through these holes and tightened by screw fasteners 51a and 51b, thereby fixing the positional relationship between the vertical plate 14, the retaining plate 11, and the first cutter clamping block 15. Similarly, the vertical plate 14, the retaining plate 11, and the second cutter clamping block 16 are also fixed together. As shown in Figure 5(d), the hole 161 in the second cutter clamping block 16 is a wide hole (position adjustment hole) that extends horizontally across the upper surface of the base. After passing a screw through this position adjustment hole, the screw is loosened, and the second cutter clamping block 16 is slid along the upper surface 2a of the base to match the width of the cutter. After fixing the cutter, the screw is tightened.

[0039] Figure 3 is a partial cross-sectional view showing the cutting edge 41 of the cutter 4 and its surrounding area. Figure 3 is a cross-sectional view of the joint between the base portion 2 and the cutter holder portion 1, i.e., in a direction parallel to the hinge 3, and shows the closed state in which the base portion 3 and the cutter holder portion 1 are closed. In Figure 3, 2a, 2c, 4, 15 and 16 represent the same components as in Figures 1 and 2. Also, 7 represents the item to be opened, as in Figure 4, and 164 represents the anti-slip sheet for preventing the cutter 4 from slipping, as in Figure 5(d).

[0040] As shown in Figure 3, a hole 23 (shown as a dashed line in the figure, either hole 23-1 or hole 23-2) is formed in the upper surface 2a of the base portion 2, and in the closed state shown in Figure 3, the tip of the cutting edge 41 of the cutter 4 reaches into the hole 23. The hole 23 formed in the upper surface 2a of the base portion 2 may be a through hole 23-2, as shown by the dashed line in Figure 3. If a through hole 23-2 is formed, a blade tip covering member 24 (protective device) is provided to prevent fingers from being cut by the blade tip 41 protruding downwards from the hole while pressing against the lower surface 2c of the base portion 2. This avoids the risk of injuring fingers with the cutter blade tip 41 protruding from the hole.

[0041] Figure 5 shows the retaining plate 12, the pressing plate 11, the first cutter clamping block 15, and the second cutter clamping block 16 that constitute the cutter holding section 1. In Figure 5, (a), (c), and (d) are perspective views of the retaining plate 12, the first cutter clamping block 15, and the second cutter clamping block 16, respectively, and Figure 5(b) is a plan view of the pressing plate 11. Similarly, in Figure 5(a), 13 represents a horizontal plate, 14 represents a vertical plate, and 17 represents a finger insertion section.

[0042] 121, 122, and 123 in Figure 5(a), 111, 112, and 113 in Figure 5(b), 151 and 152 in Figure 5(c), and 161 in Figure 5(d) are screw holes provided for inserting screws. A single screw passes through screw holes 111, 151, and 121, screw holes 112, 152, and 122, or screw holes 113, 161, and 123, respectively, and is tightened from the retaining plate 11 side and the holding plate 12 side, thereby fixing the holding plate 12, the first cutter clamping block 15 or the second cutter clamping block 16, and the retaining plate 11 to each other.

[0043] However, the screw hole 161 of the second cutter clamping block 16 shown in Figure 5(d) is a wide hole (position adjustment hole) that extends horizontally on the upper surface of the base portion, allowing the second cutter clamping block 16 to slide along the upper surface 2a of the base portion 2 to match the width of the cutter when the screw is loosened. After sliding, once the position is determined, the cutter 4 can be fixed by tightening the screw to fix the second cutter clamping block 16.

[0044] Item 164 shown in Figure 5(d) is an anti-slip sheet for preventing the cutter 4 from slipping, and is an elastic layer made of silicone rubber. Although not shown, the first cutter clamping block 15 also has a similar elastic layer on the back side of the figure.

[0045] The opening device of the above embodiment is used, for example, as follows. First, the cutter holding part 1 and the base part 2 are closed. With the screw passing through the screw hole 161 loosened, the second cutter clamping block 16 is slid to widen the space between the first cutter clamping block 15 and the second cutter clamping block 16, and the cutter is inserted into that space. Then, the second cutter clamping block 16 is slid in the opposite direction to fix the cutter in place, and the screw passing through the screw hole 161 is tightened. In this state, the cutting edge 41 of the cutter 4 is extended so that the cutting edge 41 is deeper than the opening of the hole 23.

[0046] Next, the opener opens the object to be opened 7 by slightly opening the space between the cutter holder 1 and the base 2 and placing the object to be opened 7 on it, so that the blade tip 41 is positioned at the opening point of the object to be opened 7. Figure 6 is a schematic perspective view illustrating the state in which the opener opens the object to be opened 7 by slightly opening the space between the cutter holder 1 and the base 2 and placing the object to be opened 7 on the upper surface 2a of the base 2. After that, the opener closes the cutter holder 1 and the base 2, and as shown in Figure 4, insert the thumb into the finger insertion part 17 and place the remaining fingers on the lower surface 2c of the base 2, and while gripping the object to be opened 7 with appropriate force, slide the opener consisting of the cutter holder 1 and the base 2 in a direction parallel to the blade of the cutter (in the direction of the arrow in Figure 4).

[0047] According to the opening tool of the present invention, the cutting edge of the cutter can be placed at the desired opening position, and the force pressing the cutter holder and the base can be adjusted according to the thickness and hardness of the object to be opened. This allows for a firm grip on objects made of various materials and having varying thicknesses and hardnesses, enabling reliable and easy opening.

[0048] For example, the opening tool of the present invention can be used by holding it between the palms of the hands. The purpose can be achieved by holding the opening tool with one hand and the object to be opened with the other hand, setting the tip of the cutter of the opening tool to the desired position, and sliding it. Therefore, the angle or direction of opening the envelope or bag can be freely adjusted. For example, when opening a retort food bag, it can be opened at an angle or direction that prevents the liquid contents from spilling.

[0049] When attempting to cut envelopes or bags from the edge with a cutter, there may be resistance at the start of the cut, and it can be somewhat difficult to adjust the clamping force appropriately, especially with thin or soft materials. In this case, after placing the envelope or bag on the base, closing the cutter holder and base creates a notch or opening in the envelope or bag, and then sliding the opening tool allows for smoother opening of the sealed document or bag. Alternatively, after creating a notch at the edge of the envelope or bag, it is also possible to open the envelope or bag by hand through that notch.

[0050] Furthermore, since the opening tool of the present invention allows the cutter holder and base to be opened and closed with one hand, after one opening operation is completed, the opening tool can be used to perform the next opening operation without removing it from the hand. In other words, there is no need to remove the opening tool from the hand after each operation, and a large number of envelopes and bags can be opened smoothly and efficiently. [Explanation of symbols]

[0051] 1. Cutter holding section 11 Retaining plate 111, 112, 113 screw holes 12 Retaining plate 121, 122, 123 screw holes 13 horizontal board 131 Top surface (of the horizontal plate) 14 Vertical plate 15. First cutter clamping block 151,152 screw holes 16. Second cutter clamping block 161 Wide screw holes (position adjustment holes) 163 Cutter clamping surface 164 Elastic layer 17 Finger insertion area 2. Base 2a Top surface (of the base) 2b Legs (of the base) 2c (Underside of the base) 23 (Hole formed in the base) 3. Hinge (connecting part between cutter holder 1 and base 2) 4 cutters 51a, 51b, 51c Screw tightening 7 Item to be opened 8 fingers

Claims

1. It has a base portion with a flat top surface and a hole opening in the top surface, and a cutter holder portion for holding the cutter. The cutter holding section comprises a holding plate consisting of a horizontal plate and a vertical plate perpendicular to the horizontal plate, a retaining plate arranged parallel to the vertical plate and at a predetermined interval, and a first cutter clamping block and a second cutter clamping block that are sandwiched and fixed between the vertical plate and the retaining plate. The first cutter clamping block and the second cutter clamping block each have cutter clamping surfaces that clamp and hold a cutter, which are parallel to each other and face each other with a gap between them for holding the cutter. The cutter holder and the base are connected in such a way that they can be opened and closed, allowing a transition between a closed state in which the lower surface of the horizontal plate and the upper surface of the base are in close contact and an open state in which they are separated. An opening device characterized in that, in the closed state, the cutting edge of the cutter held in the cutter holding part reaches into the hole formed in the base part.

2. The opening device according to claim 1, characterized in that the connection between the cutter holding portion and the base portion is a hinge connection.

3. The opening device according to claim 1 or 2, characterized in that at least one of the first cutter clamping block and the second cutter clamping block is configured such that its fixing position can be changed in a direction parallel to the upper surface of the base portion.

4. The opening tool according to claim 1, characterized in that the hole in the base portion is a through hole that penetrates from the upper surface to the lower surface of the base portion.

5. The opening tool according to claim 4, characterized in that a blade tip covering member is provided on the lower surface of the base portion to cover the opening of the through hole.

6. The opening device according to claim 1, characterized in that a finger insertion portion for inserting a finger is provided on the upper surface of the horizontal plate of the retaining plate.

7. The opening tool according to claim 1, characterized in that two or more legs are provided on the lower side of the base portion, erected substantially perpendicular to the upper surface of the base portion, with spaces between them to allow fingers to be inserted.

8. The opening device according to claim 1, characterized in that an elastic layer is provided on at least one of the cutter clamping surfaces of the first cutter clamping block and the cutter clamping surface of the second cutter clamping block.

9. The opening device according to claim 8, characterized in that the elastic layer is a silicone rubber layer.

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