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]

[0001] The present invention relates to an opening tool used to open envelopes, food bags, and the like. [Background technology]

[0002] Envelopes are often opened using a paper knife, a box cutter, scissors, etc. Food bags can be opened in a variety of ways, including pulling both sides of the bag to open it from the seam, or pulling the top and bottom of a cut in part of the bag to open it from this cut, etc.

[0003] Recently, envelopes have become more diverse, with envelopes made of thick, hard materials and envelopes with firmly glued openings. In particular, commercial envelopes are often made of thick, hard materials and are large in size. To open such envelopes using a paper knife, cutter, or scissors requires a lot of force, and opening a large number of envelopes can be a heavy task. In addition, if a cutter is used with the cutting edge extended too far, the cutting edge may break, which is dangerous.

[0004] As for food bags, the outer bags of foods such as snacks are often relatively thick, and retort food bags are often made of hard, thick aluminum layers, so they require a lot of force to open, and the burden of opening them is often a problem. Also, it is difficult for elderly people living alone to open them by themselves. Therefore, there is a demand for a device (opening tool) that allows anyone to safely and easily open large quantities 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 having a U-shaped cross section with guide walls in three directions, an envelope is slid into the U-shaped space, and the envelope is opened with the cutter blade protruding 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, so that the cutter blade protruding from above can reliably cut the envelope, and a leaf spring is provided at the bottom of the U-shaped space to press the envelope against the upper surface.

[0006] However, in the opening tool of Patent Document 1, depending on the thickness and hardness 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. For this reason, there is a problem that the opening tool cannot be opened reliably and is difficult to use.

[0007] A variety of other opening tools have been disclosed and sold, ranging from electrically operated palm-sized devices to large devices for processing large quantities. However, these tools are unable to accommodate the recent diversification in thickness and hardness of envelopes, food bags, etc., and have not been satisfactory as devices for reliably and easily opening envelopes, food bags, etc. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Utility Model Application Publication No. 7-2095 Summary of the Invention [Problem to be solved by the invention]

[0009] An object of the present invention is to provide an opening tool capable of reliably and easily opening an object such as an envelope or a food bag, regardless of the thickness or hardness of the object. [Means for solving the problem]

[0010] As a result of extensive research into solving the above problems, the present inventors have found that An opening tool that is provided with a base portion on which an item to be opened, such as an envelope or food bag, is placed and slid, and a cutter holding portion that stably fixes and holds a cutter (meaning an instrument consisting of a blade and a member that holds the blade; the same applies below), the cutter holding portion and the base portion are joined so as to be able to be opened and closed, and a hole is provided in the base portion through which the cutting edge of the cutter held by the cutter holding portion can be inserted when the cutter holding portion and the base portion are in a closed state. The inventors discovered that the object to be opened can be securely opened by a simple operation of sandwiching the object between the base and the cutter holding part, and sliding the object while pressing the base and the cutter holding part with a finger or the like, and thus completed the present invention. That is, the above-mentioned object of the present invention is achieved by an opening tool having the following configuration.

[0011] The first aspect of the present invention is The cutter holder includes a base portion having a flat upper surface and a hole opening to the upper surface, and a cutter holder portion for holding a cutter. The cutter holding section includes a holding plate including a horizontal plate and a vertical plate perpendicular to the horizontal plate, a pressing plate arranged parallel to the vertical plate and spaced apart from the vertical plate by a predetermined distance, and a first cutter clamping block and a second cutter clamping block clamped and fixed between the vertical plate and the pressing plate, The first cutter clamping block and the second cutter clamping block each have a cutter clamping surface that clamps and holds a cutter, and the ... the cutter holding portion and the base portion are connected to be openable and closable so as to be capable of transitioning 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 with each other and an open state in which the two are separated from each other; The opening device is characterized in that in the closed state, the tip of the cutter held in the cutter holding portion reaches inside the hole formed in the base portion. Effect of the Invention

[0012] The opening device of the present invention opens the item to be opened, such as an envelope or food bag, by sandwiching the item to be opened between the cutter holding part and the base part, pressing them together, and sliding the cutter holding part or the item to be opened. The opening device of the present invention sandwiches the item to be opened between the cutter holding part and the base part, which are joined by a hinge or the like so that they can be opened and closed, so that even if the item to be opened is thick, it can be sandwiched.The item to be opened can be opened by sliding the cutter holding part or the item to be opened while pressing the cutter holding part, the item to be opened, and the base part together. When the cutter holding portion and the base portion are in the open state, the position of the item to be opened placed on the base portion can be easily adjusted so that the tip of the cutter is located at the position where it is desired to open the item.

[0013] The cutter holding part, the base part, and the object to be opened are pressed together by closing the cutter holding part and the base part and pressing the cutter holding part and / or the base part. By adjusting the pressing force, the object to be opened can be firmly gripped between the cutter holding part and the base part, and even objects made of thick or hard materials can be opened reliably. Furthermore, if the pressing is performed by hand, the pressing force can be easily adjusted according to the thickness and hardness of the object to be opened, and even objects made of thick or hard materials can be opened reliably and easily.

[0014] In addition, if the opening tool of the present invention is held in one hand and the cutter holding part and the base part are opened and closed and the pressure contact (pressure) is performed by the fingers, the next opening operation can be performed without removing the opening tool from the hand after one opening operation is completed. In other words, there is no trouble of removing the opening tool from the hand for each operation, and multiple items can be opened smoothly and continuously, improving the efficiency of the opening operation. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing one embodiment of an opening device of the present invention. [Diagram 2] FIG. 1 is a perspective view showing one embodiment of an opening device of the present invention. [Diagram 3]2 is a partial cross-sectional view showing a cutting edge 41 of a cutter 4 and its surroundings in one embodiment of an opening device of the present invention. FIG. [Figure 4] FIG. 2 is a schematic perspective view showing an example of an operation for opening an object to be opened using the opening device of the present invention; [Diagram 5] 1A is a perspective view or plan view showing (a) a retaining plate, (b) a pressing plate, (c) a first cutter clamping block, and (d) a second cutter clamping block used in one embodiment of the opening device of the present invention. FIG. [Figure 6] FIG. 1 is a schematic perspective view showing an open state of one embodiment of an opening device of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0017] The opening device of the present invention comprises a base portion on which the item to be opened is placed when opening, and a cutter holding portion for stably holding and fixing a cutter when opening, and the base portion and cutter holding portion are joined so as to be able to be opened and closed.

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

[0019] The hole may be a through hole penetrating from the upper surface to the lower surface of the base. In the case of a through hole, since the cutting edge of the cutter approaches the lower surface of the base or protrudes from the lower surface, and there is a risk of injuring fingers pressing against the lower surface, it is preferable to provide a protective device (cutting edge covering member) that covers the opening on the lower surface and covers the cutting edge.

[0020] It is preferable that the underside of the base has two or more legs that are erected substantially perpendicularly to the upper surface of the base, spaced apart so that a finger can be inserted between them. By providing two or more legs that are erected substantially perpendicularly to the lower surface of the base with a space between them so that a finger can be inserted between them, a gap is formed between the opening / closing tool of the present invention and a desk (table) or the like when the opening / closing tool is placed on the desk (table) or the like, into which a finger can be inserted. As a result, during the opening operation, it becomes easier to insert a finger into the space on the underside of the base while the base is placed on the desk (table), making the opening operation easier. In addition, when the hole is a through hole, the tip of the cutter inserted into the hole in the base does not touch the table. The base may have a U-shaped cross section with the legs provided at both ends.

[0021] The cutter holding portion has a holding plate consisting of a horizontal plate and a vertical plate, and a pressing plate arranged parallel to and facing the vertical plate with a predetermined distance therebetween. The horizontal plate of the holding plate is a plate whose lower surface comes into close contact with the upper surface of the base when the cutter holding portion and the base are in a closed state. When opening an object to be opened, the object is sandwiched between the lower surface of the horizontal plate and the upper surface of the base. After that, they are pressed together, and the object to be opened is slid on the upper surface of the base, whereby the object to be opened is cut by the cutting edge of the cutter and opened.

[0022] The vertical plate is a plate that is erected approximately vertically on the horizontal plate. The horizontal plate and the vertical plate may be formed separately and assembled, but it is preferable to form them as an integral member, since this makes it easier to manufacture the holding plate. The holding plate may be a holding plate with an L-shaped cross section in which the vertical plate is erected on one end of the horizontal plate, or a holding plate with a T-shaped cross section in which the vertical plate is erected at a predetermined position on the upper surface of the horizontal plate.

[0023] The pressing plate is disposed so that its surface (plate surface) is approximately parallel to the vertical plate (the surface perpendicular to the horizontal plate) and so that a predetermined distance is provided between the plate surface and the surface of the vertical plate facing the pressing plate. Here, the predetermined distance is a distance corresponding to the thickness of the cutter, and also a distance corresponding to the thickness of a first cutter clamping block and a second cutter clamping block described below.

[0024] A first cutter clamping block and a second cutter clamping block are disposed between the pressing plate and the vertical plate. The first cutter clamping block and the second cutter clamping block have cutter clamping surfaces that face each other in parallel so that the cutter can be held perpendicular or oblique to the joint surface between the cutter holding part and the base when the cutter holding part and the base are in a closed state. The cutter is held so that the cutting edge is parallel to the joint portion between the cutter holding part and the base. 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 presser plate and the vertical plate so that the respective cutter clamping surfaces face each other substantially parallel to each other and a gap is generated between the cutter clamping surfaces to clamp and hold the cutter. The cutter is inserted into a 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 presser plate, and the surface of the vertical plate facing the presser plate, and the position of the cutter relative to the cutter holding part is fixed.

[0025] In order to reliably fix the position of the cutter relative to the cutter holding part, it is preferable that at least one of the cutter clamping surfaces of the first cutter clamping block and the second cutter clamping block is provided with an elastic layer as an anti-slip sheet to prevent the cutter from slipping. The elasticity of the elastic layer fixes the position of the cutter more reliably. More preferably, an elastic layer is provided on the cutter clamping surfaces of both the first cutter clamping block and the second cutter clamping block, which makes it possible to fix the position of the cutter even more reliably.

[0026] The thickness, surface shape, and forming material of the elastic layer are not particularly limited as long as they can reliably fix the position of the cutter, but silicone rubber is preferred as the forming material from the viewpoints of durability, chemical stability, etc.

[0027] The positional relationship between the holding plate, the pressing plate, the first cutter clamping block, and the second cutter clamping block is fixed so that the space into which the cutter is inserted does not fluctuate (deform) during opening. A method for fixing the positional relationship may be to fasten screws that pass from the holding plate through the first cutter clamping block or the second cutter clamping block and further through the pressing plate from the holding plate side and the pressing plate side. As for the fixing method, a mode in which either the first cutter clamping block or the second cutter clamping block is fixed to a predetermined position of either the holding plate or the pressure plate by adhesive or the like, or a mode in which either the first cutter clamping block or the second cutter clamping block is formed integrally with the holding plate or the pressure plate are also possible.

[0028] At least one of the first cutter clamping block and the second cutter clamping block is preferably formed so that its fixed position can be slid in a direction parallel to the upper surface of the base. By making the fixed position slidable in a direction parallel to the upper surface of the base, the interval between the cutter clamping surfaces of the first cutter clamping block and the second cutter clamping block can be varied and adjusted to accommodate cutters of various sizes (widths). In addition, by inserting the cutter into the space and then sliding it, it becomes easy to attach the cutter and fix its position. Both the first cutter clamping block and the second cutter clamping block may be formed to be slidable, and both may be slid; however, in this case, the structure of the opening / closing device becomes complicated, and the operation for adjusting the distance between the cutter clamping surfaces may also become complicated, so it is preferable to slide only one of them.

[0029] As a method for forming the fixed position so as to be slidable in a direction parallel to the upper surface of the base, a wide hole (position adjustment hole) extending horizontally on the upper surface of the base can be made in the cutter clamping block. After a screw for fixing the cutter clamping block or the like is passed through the position adjustment hole, the cutter clamping block is slid along the upper surface of the base to match 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] The upper surface of the horizontal plate of the holding plate is preferably provided with a finger insertion section for inserting a finger. The finger insertion section is preferably arc-shaped so that the finger can be inserted and loosely fixed. In addition, by providing a finger insertion section and inserting one finger (e.g., thumb) into the finger insertion section and placing the other finger on the underside of the base, the cutter holding section and the base can be pinched with one hand, and the cutter holding section and the base can be easily opened and closed with the fingers, and an appropriate pressing force can be applied. Thus, a large number of opened items can be opened continuously and efficiently by operating with one hand.

[0031] The opening tool of the present invention is characterized in that the cutter holding part and the base part are connected so as to be openable and closable. That is, the cutter holding part and the base part are formed so as to be capable of transitioning between a closed state in which the lower surface of the horizontal plate and the upper surface of the base part are in close contact with each other, and an open state in which the two are separated. As a method for connecting the cutter holding part and the base part so as to be openable and closable, a method in which the connecting part between the cutter holding part and the base part is a hinge (connection) is preferable.

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

[0033] In the opening tool of the present invention, when the cutter holding part and the base part are in a closed state, the cutter is held by the cutter holding part so that the cutting edge of the cutter reaches the hole of the base part. By holding the cutter in this manner, the object to be opened can be reliably opened by sliding the object on the base part. The cutting edge of the cutter reaching the hole of the base part means that the cutting edge is below (inside) the opening surface of the hole (the upper opening surface in the case of a through hole), and the cutting edge may be inserted deeper into the hole. EXAMPLES

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

[0035] Fig. 1 shows an embodiment of the opening device of the present invention, and is a perspective view seen from the holding plate side. Fig. 2 shows the same embodiment as Fig. 1, but is a perspective view seen from the pressing plate side. Both show the closed state. 1 and 2, 1 indicates the cutter holding part, 2 indicates the base part, 3 indicates a hinge connecting the cutter holding part 1 and the base part 2, and 4 indicates the cutter held by the cutter holding part 1. The cutter holding part 1 is composed of a holding plate 12 consisting 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] 1 and 2, in this example, the vertical plate 14 is vertically erected on the end of the horizontal plate 13, and the holding plate 12 is formed into an L-shaped cross section. The pressing plate 11 faces the vertical plate 14 in parallel, and a first cutter clamping block 15 and a second cutter clamping block 16 are clamped between the pressing plate 11 and the vertical plate 14. Reference numeral 17 in FIG. 1 denotes an arc-shaped finger insertion portion for inserting a finger, and by inserting a finger into the finger insertion portion 17 and pressing the upper surface 131 of the horizontal plate 13, the lower surface of the horizontal plate 13 and the upper surface of the base portion 2 and the object to be opened that are clamped between them can be pressed with an appropriate force.

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

[0038] In the example shown in Figures 1 and 2, the vertical plate 14, the pressure plate 11, and the first cutter clamping block 15 have screw holes penetrating them, and screws are inserted into the holes and tightened by the screws 51a and 51b, so that the positional relationship between the vertical plate 14, the pressure plate 11, and the first cutter clamping block 15 is fixed. Similarly, the vertical plate 14, the pressure plate 11, and the second cutter clamping block 16 are also fixed, but as shown in Figure 5(d), the hole 161 opened in the second cutter clamping block 16 is a wide hole (position adjustment hole) extending horizontally on the upper surface of the base part, and after a screw is passed through the position adjustment hole, the second cutter clamping block 16 is slid along the upper surface 2a of the base part in accordance with the width of the cutter with the screw loosened, and the cutter is fixed and then the screw is tightened.

[0039] Fig. 3 is a partial cross-sectional view showing the cutting edge 41 of the cutter 4 and its surroundings. Fig. 3 is a cross-sectional view of the joint between the base part 2 and the cutter holding part 1, i.e., a direction parallel to the hinge 3, and shows the closed state in which the base part 3 and the cutter holding part 1 are closed. In Fig. 3, 2a, 2c, 4, 15, and 16 represent the same members as in Figs. 1 and 2. Also, 7 represents the item to be opened as in Fig. 4, and 164 represents an anti-slip sheet to prevent the cutter 4 from slipping as in Fig. 5(d).

[0040] As shown in FIG. 3, a hole 23 (hole 23-1 or hole 23-2, represented by a dashed line in the figure) is formed in the upper surface 2a of the base portion 2, and in the closed state shown in FIG. 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 2 may be a through hole 23-2 indicated by a dashed line in Fig. 3. When a through hole 23-2 is formed, a blade tip covering member 24 (protective gear) is provided to prevent the blade tip 41 protruding downward from the hole from cutting fingers pressing against the lower surface 2c of the base 2. This prevents the risk of fingers being injured by the blade tip 41 of the cutter protruding from the hole.

[0041] Fig. 5 shows the holding plate 12, the pressing plate 11, the first cutter clamping block 15, and the second cutter clamping block 16 which constitute the cutter holding section 1. In Fig. 5, (a), (c), and (d) are perspective views showing the holding plate 12, the first cutter clamping block 15, and the second cutter clamping block 16, respectively, and (b) in Fig. 5 is a plan view showing the pressing plate 11. As above, in Fig. 5(a), 13 indicates a horizontal plate, 14 indicates a vertical plate, and 17 indicates 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, and one 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 screwed from the pressure plate 11 side and the holding plate 12 side, respectively, thereby fixing the holding plate 12, the first cutter clamping block 15 or the second cutter clamping block 16, and the pressure plate 11 to each other.

[0043] However, the screw hole 161 of the second cutter clamping block 16 shown in Fig. 5(d) is a wide hole (position adjustment hole) extending horizontally on the top surface of the base part, and with the screw loosened, the second cutter clamping block 16 can be slid along the top surface 2a of the base part 2 according to the width of the cutter. After sliding, once the position is determined, the screw can be tightened to fix the second cutter clamping block 16, thereby fixing the cutter 4.

[0044] 5(d) shows an anti-slip sheet 164 for preventing the cutter 4 from slipping, which is an elastic layer made of a silicone rubber sheet. 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 tool 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 gap between the first cutter clamping block 15 and the second cutter clamping block 16, and the cutter is inserted into the space. After that, the second cutter clamping block 16 is slid in the opposite direction to the position where the cutter is fixed, 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 cutter holding part 1 and the base part 2 are slightly spaced apart, and the object 7 is placed on the cutter holding part 1 so that the blade tip 41 is at the opening position of the object 7. FIG. 6 is a schematic perspective view showing the cutter holding part 1 and the base part 2 being slightly spaced apart and the object 7 being placed on the upper surface 2a of the base part 2. Thereafter, the cutter holding part 1 and the base part 2 are closed, and as shown in FIG. 4, the thumb is inserted into the finger insertion part 17, and the remaining fingers are placed on the lower surface 2c of the base part 2. While pinching the object 7 with an appropriate force, the opening tool consisting of the cutter holding part 1 and the base part 2 is slid in a direction parallel to the blade of the cutter (the direction of the arrow in FIG. 4), and the object 7 can be opened.

[0047] With the opening device of the present invention, the cutting edge of the cutter can be placed at the desired position to open, and the force with which the cutter holding portion and the base portion are pressed together can be adjusted according to the thickness and hardness of the item to be opened. This allows items made of a variety of materials and having a variety of thicknesses and hardness to be firmly gripped and opened reliably and easily.

[0048] For example, the opening tool of the present invention can be used by pinching it between the palms of the hands, and the object to be opened can be held in one hand, and the cutting edge of the opening tool can be set at the desired position for opening and slid to achieve the purpose. Therefore, the angle or direction of the envelope or bag when opening can be freely adjusted. For example, when opening a bag of retort food, it can be opened at an angle or direction that does not spill the liquid contents when opened.

[0049] When trying to cut an envelope or bag from its edge with a cutter, there is resistance at the beginning of the cut, and it can be somewhat difficult to adjust the clamping force appropriately, especially for thin or soft items. In this case, after placing the envelope or bag on the base, the cutter holding part and the base part are closed to make a slit or cut in the envelope or bag, and then the opening tool is slid, allowing the sealed document or bag to be opened more smoothly. It is also possible to make a slit at the end of the envelope or bag, and then open the envelope or bag by hand through the slit.

[0050] In addition, the opening tool of the present invention can open and close the cutter holding part and the base part by holding the opening tool with one hand, so that after one opening operation is completed, the next opening operation can be performed without removing the opening tool from the hand. In other words, there is no hassle of removing the opening tool from the hand for each operation, and a large number of envelopes and bags can be opened smoothly and efficiently. [Explanation of symbols]

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

Claims

1. The cutter holder has a base portion having a flat upper surface and a hole opening to the upper surface, and a cutter holder portion for holding the cutter. The cutter holding section includes a holding plate including a horizontal plate and a vertical plate perpendicular to the horizontal plate, a pressing plate arranged parallel to the vertical plate and spaced apart from the vertical plate by a predetermined distance, and a first cutter clamping block and a second cutter clamping block that are clamped and fixed between the vertical plate and the pressing plate, The first cutter clamping block and the second cutter clamping block each have a cutter clamping surface that clamps and holds a cutter, the cutter clamping surface facing each other in parallel with a gap that holds the cutter, the cutter holding portion and the base portion are connected to be openable and closable so as to be capable of transitioning 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 with each other and an open state in which the two are separated from each other; An opening device characterized in that, in the closed state, the tip of a cutter held in the cutter holding portion reaches into a hole formed in the base portion.

2. The opening device according to claim 1, wherein the cutter holding portion and the base portion are connected by a hinge connection.

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

4. The opening tool according to claim 1 , wherein the hole in the base portion is a through hole passing through the base portion from an upper surface to a lower surface.

5. The opening tool according to claim 4, characterized in that a cutting edge covering member for covering the opening of the through hole is provided on the underside of the base portion.

6. 6. The opening device according to claim 1, wherein a finger insertion portion for inserting a finger is provided on an upper surface of the horizontal plate of the holding plate.

7. An opening device as described in any one of claims 1 to 6, characterized in that two or more legs are provided on the underside of the base portion, standing approximately perpendicular to the upper surface of the base portion, with a gap between them large enough to insert a finger.

8. 8. The opening tool according to claim 1, wherein an elastic layer is provided on at least one of the cutter clamping surface 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, wherein the elastic layer is a silicone rubber layer.

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