Handheld functional appliance

Abstract

To provide a hand-held functional tool which includes a functional tool body having a function surface on a bottom surface and a grip integral with the functional tool body and can prevent an unexpected accident by the function surface.SOLUTION: A hand-held functional tool 1 having a functional tool body 2 having a function surface 16 on a bottom surface and a grip integral with the functional tool body 2 includes a pair of left and right protective blocks 60, 60 which is pivotally supported in a manner of being rotatable around shafts 52, 52 of hinges 50, 50 by the hinges 50, 50 provided respectively on left and right ends of the functional tool body 2, and which can be selectively arranged at a closed position P1 where the function surface 16 is turned into a covered state and at an open position P2 where the function surface 16 is turned into an exposure state by being opened / closed in a double-door manner from the function surface 16.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a handheld functional instrument. More specifically, the present invention relates to a handheld functional instrument having a functional instrument body provided with a functional surface on the bottom surface and a handle integrated with the functional instrument body, and aims to improve the safety of the functional surface.

Background Art

[0002] As an example of a handheld functional instrument having a functional instrument body provided with a functional surface on the bottom surface and a handle integrated with the functional instrument body, there is a temporary handle of Patent Document 1. As shown in FIG. 11, this temporary handle 90 includes a base member 91 and a grip 92. The base member 91 is detachably adsorbed to a lifting weight 93 made of a magnetically adsorbable metal. The grip 92 is a handle disposed on the base member 91 and can be gripped with at least one hand. That is, the bottom surface of the base member 91 functions as a magnetic adsorption surface.

[0003] According to this temporary handle 90, when performing the ball hanging operation of a lifting weight 93 such as a steel plate, after magnetically adsorbing the temporary handle 90 to the surface 94 of the lifting weight 93, the lifting weight 93 is lifted by a ceiling crane (not shown), a wire 95, etc. In this case, the temporary handle 90 is attached to the lifting weight 93 by adsorbing the magnetic force adsorption portion (magnetic adsorption surface) 96 on the bottom surface of the base member 91 of the temporary handle 90 to the surface 94 of the lifting weight 93.

[0004] Since the temporary handle 90 attached on the surface 94 of the lifting weight 93 is integrated with the lifting weight 93, if an operator grips the grip 92 of the temporary handle 90 by hand, the operator can easily maintain the posture of the lifting weight 93 in a fixed state or perform positioning when landing the lifting weight 93 according to the operator's will. Thus, by using the temporary handle 90 in the ball hanging operation, the operator can easily and safely perform the posture adjustment operation and the landing position adjustment operation of the lifting weight 93 without touching the lifting weight 93 or the wire 95.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Utility Model Registration No. 3212882 [Disclosure of the Invention] [Problems to be Solved by the Invention]

[0006] By the way, since the magnetic adsorption part 96 of the above-mentioned temporary handle 90 is always exposed when not in use, it may inadvertently adsorb to an iron plate or tool in the vicinity. In particular, when the magnetic force of the magnetic adsorption part 96 is strong, it may cause injury when a hand or finger is pinched between the magnetic adsorption part 96 and the adsorbed object. Such problems are not limited to the above-mentioned temporary handle having a magnetic adsorption surface as a functional surface, but also apply to, for example, an iron whose functional surface generates high heat.

[0007] The present invention has been made in view of the above problems, and in a handheld functional instrument having a functional instrument body provided with a functional surface on the bottom surface and a handle integrated with the functional instrument body, an object is to provide a handheld functional instrument capable of preventing an unexpected accident caused by the functional surface. [Means for Solving the Problems]

[0008] The present invention takes the following means to solve the above problems. In this column (the column of "Means for Solving the Problems"), the reference numerals in parentheses attached to each constituent means are for showing the correspondence with the specific means described in the embodiments to be described later, and the constituent means of the present invention are not limited thereto.

[0009] One aspect of the present invention is a handheld functional instrument (1) having a functional instrument body (2) with a functional surface (16) on the bottom surface and a handle (30) integrated with the functional instrument body (2). A pair of left and right protective blocks (60, 60) are pivotally supported around the axes (52, 52) of hinges (50, 50) provided at the left and right ends of the functional instrument body (2) respectively, and can be selectively arranged in a closed position (P1, P1) where the functional surface (16) is covered and an open position (P2, P2) where the functional surface (16) is exposed, and open and close in a butterfly fashion when viewed from the functional surface (16).

[0010] According to this aspect, when using the handheld functional instrument (1), by arranging the pair of left and right protective blocks (60, 60) in the open positions (P2, P2) respectively, the functional surface (16) of the functional instrument body (2) can be exposed. Also, when not using the handheld functional instrument (1), by arranging the pair of left and right protective blocks (60, 60) in the closed positions (P1, P1) respectively, the functional surface (16) of the functional instrument body (2) can be covered and made non-exposed. That is, the functional surface (16) can be made non-exposed except during use, and unexpected accidents caused by the functional surface (16) can be prevented.

[0011] In another aspect of the present invention, among the pair of left and right protective blocks (60, 60), the rotation angle (θ) when one protective block (60) is arranged from the closed position (P1) to the open position (P2), and the rotation angle (θ) when the other protective block (60) is arranged from the closed position (P1) to the open position (P2) are 180 degrees in the clockwise direction and 180 degrees in the counterclockwise direction respectively.

[0012] According to this aspect, when using the functional surface (16), that is, when in the open position (P2), the protective blocks (60, 60) do not interfere with the object, so the workability during use is good.

[0013] In another aspect of the present invention, fixing members (71, 72) for fixing the pair of left and right protective blocks (60, 60) in a fixed position at the open positions (P2, P2) and the closed positions (P1, P1) respectively are provided.

[0014] According to this aspect, since the pair of left and right protection blocks (60, 60) are fixed in place at the open positions (P2, P2), the workability during use is good. Also, since they are fixed in place at the closed positions (P1, P1), the safety of the functional surface (16) can be continuously ensured.

[0015] In another aspect of the present invention, there is a fixing portion (40) for detachably fixing, without tools, a pair of left and right protection blocks (60, 60) pivotally supported around the axis (52) of the hinge (50) by the hinge (50) to the left and right ends of the functional instrument body (2).

[0016] According to this aspect, the safety of the functional surface (16) can be ensured without changing the structure of the existing functional instrument body (2).

[0017] In another aspect of the present invention, the functional surface (16) is a magnetically adsorbing surface.

Effects of the Invention

[0018] According to the present invention, there is provided a handheld functional instrument having a functional instrument body with a functional surface on the bottom surface and a handle integrated with the functional instrument body, which can prevent unexpected accidents caused by the functional surface.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

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Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this specification, "magnetic adsorption" may be simply referred to as "magnetic attachment".

[0021] FIG. 1 is an external perspective view of a magnetic attachment type construction tool 1 according to the present invention, and FIG. 2 is a perspective view showing a state where the main body 2 is detached from the safety device 3 in the construction tool 1. FIG. 3 is a three-view drawing of the main body 2, where (a) is a front sectional view (sectional view taken along line A - A in FIG. 2), (b) is a plan view, and (c) is a side view. FIG. 4 is a three-view drawing of the safety device 3, where (a) is a front view, (b) is a plan view, and (c) is a side view. FIG. 5 is a diagram for explaining the arrangement state of the protection block 60 in the safety device 3, where (a) is a side view when the protection block 60 is in the closed position P1, (b) is a side view when the protection block 60 is in the open position P2, and (c) is a perspective view when the protection block 60 is in the open position P2.

[0022] The magnetic attachment type construction tool 1 according to the present invention has a main body 2 and a safety device 3 as shown in FIG. 1. The main body 2 and the safety device 3 are detachable without using tools as shown in FIG. 2. The construction tool 1 is a tool used when constructing a non-magnetic wall material 6 on a steel frame 4 via a special adhesive 5 as shown in FIG. 6 described later.

[0023] As shown in FIGS. 2 and 3, the main body 2 includes a casing 10, a pair of permanent magnets 20, 20 disposed inside the casing 10, and a handle 30 provided integrally with the casing 10 at the upper part of the casing 10.

[0024] 〔Casing〕 The casing 10 is a hollow rectangular parallelepiped-shaped box made of a non-magnetic material such as aluminum or synthetic resin. As shown in FIG. 3, it includes a box-shaped casing main body 11 with an open upper part, and a lid body 12 for closing the opening of the casing main body 11. The lid body 12 is provided with bolt holes 121 penetrating in the thickness direction on both sides in its longitudinal direction, and screw holes 122 at the four corners. The wall thicknesses of the casing main body 11 and the lid body 12 are set to a thickness that allows the magnetic flux of the internal permanent magnet 20 to pass through sufficiently, for example, about 1 to 3 mm.

[0025] 〔Permanent Magnet〕 The permanent magnet 20 is made of a block-type neodymium magnet, has an N pole on one surface and an S pole on the opposite surface, and is provided with a bolt hole 21 penetrating in the thickness direction at the center. The permanent magnets 20 are symmetrically arranged on both sides in the longitudinal direction in the casing main body 11 with a gap therebetween. One permanent magnet 20 is fixedly arranged with the N pole facing the bottom side, and the other permanent magnet 20 is fixedly arranged with the S pole facing the bottom side.

[0026] 〔Handle〕 The handle 30 has two base yokes 31, 31 and a coupling yoke 32. The base yoke 31 is a block-type medium-density body and is provided with a bolt hole 311 penetrating in the thickness direction at the center. The coupling yoke 32 is a rectangular parallelepiped-shaped medium-density body and is provided with bolt holes 321, 321 penetrating in the thickness direction on both sides in its longitudinal direction. Both are made of a magnetic metal, for example, ferrite stainless steel SUS434 or steel. The handle 30 is configured such that two base yokes 31, 31 are connected by the coupling yoke 32. Specifically, the coupling yoke 32 is connected in a form that bridges two base yokes 31, 31 arranged at intervals from each other, and its front view shape is that of the character "C" rotated 90 degrees counterclockwise.

[0027] For each of the components shown above, on both the left and right sides, after arranging the permanent magnets 20, the lid 12, the base yoke 31, and the coupling yoke 32 in this order from the bottom so that the bolt holes 21, 121, 311, and 321 are coaxial, insert socket head bolts 14 into these bolt holes and fasten them with nuts 15. Then, fix and assemble the lid 12 to the casing body 11 with screws 13 inserted into the screw holes 122 of the lid 12. The main body 2 assembled in this way has the bottom surface of the casing 10 become a strong magnetic adsorption surface 16 due to the permanent magnets 20, 20 in the casing 10.

[0028] 〔Safety device〕 As shown in FIGS. 2 and 4, the safety device 3 includes a fixing portion 40, hinges 50, 50, and protection blocks 60, 60. When viewed from the side, the hinges 50 and the protection blocks 60 are provided symmetrically to the left and right of the fixing portion 40 as shown in FIG. 4(c).

[0029] 〔Fixing portion〕 As shown in FIG. 4(b), the fixing portion 40 includes an elastic band 41 and side plates 42. The elastic band 41 is a ring-shaped rubber band (flexible endless shape), and is sized to surround the four side surfaces of the casing 10 in the main body 2 and be fastened with elastic contraction force. More specifically, it is made of flat rubber with a thickness of about 1 to 3 mm, and the vertical width is slightly shorter than the vertical width of the casing 10. Also, the total length of the entire circumference is slightly shorter than the peripheral length of the casing 10 in a state where it does not stretch and expand against elasticity. The material is silicon rubber, synthetic rubber, natural rubber, etc. Note that a cloth rubber band formed into a ring shape may be used.

[0030] The side plate 42 is a rectangular flexible flat plate made of magnetic metal. Its size is the same as that of the elastic band 41 in the vertical width and the same as the longitudinal length of the casing 10 in the horizontal width. For example, it is made by cutting a sheet-like steel with a thickness of about 0.2 to 0.5 mm into the above shape. The two side plates 42, 42 are fixed on both sides of the elastic band 41 so as to be mirror-symmetrical. That is, the central distance along the elastic band 41 between the center of one side plate 42 of the two side plates 42 and the center of the other side plate 42 is equal on the left and right or up and down of the endless annular elastic band 41. That is, it is equal whether measured clockwise or counterclockwise. The fixing is performed, for example, by adhering one side of the sheet-like steel to the front surface of the elastic band 41 with an adhesive.

[0031] 〔Hinge〕 A hinge 50 is attached to the central portion in the longitudinal direction of the side plate 42. The hinge 50 is composed of, for example, a pair of plastic hinge pieces 51, 51 and an iron core rod 52. Since the pair of hinge pieces 51, 51 are symmetrical to each other, only one of them will be described. As shown in Fig. 2, the hinge piece 51 is composed of a flat plate portion 53 and a cylindrical portion 54. The cylindrical portion 54 protrudes from the surface side of one end of the flat plate portion 53 and is integrally formed with the flat plate portion 53, and is a portion through which the core rod 52 can be inserted through each of the pair of hinge pieces 51, 51 coaxially. With such a configuration, as a single hinge 50, one hinge piece 51 can rotate relative to the other hinge piece 51 by 360 degrees around the core rod 52. That is, the angle φ formed between one hinge piece 51 and the other hinge piece 51 is 0 to 360 degrees.

[0032] 〔Protection Block〕 The protection block 60 is a member that covers the magnetic attachment surface 16 of the main body 2 when the main body 2 is not in use to prevent the danger caused by the magnetic force emitted from the magnetic attachment surface 16, and is composed of a rectangular parallelepiped-shaped dense body made of a non-magnetic material. The material is preferably lightweight and soft, such as polyurethane, polystyrene, synthetic rubber, etc., and a foamed material may also be used.

[0033] The protection block 60 and the side plate 42 are connected by a hinge 50 in the following form (see Fig. 4(c)). That is, among the pair of hinge pieces 51, 51, one hinge piece 51 is fixed to the side plate 42 via an adhesive on the back surface of the hinge piece 51 at the central position in the longitudinal direction of the side plate 42. The other hinge piece 51 is fixed to the side surface 62 of the protection block 60 via an adhesive on the back surface of the hinge piece 51 at the central position in the longitudinal direction of the protection block 60. More specifically, the surface of the side plate 42 in the fixing portion 40 opened in a rectangular shape corresponding to the magnet-attracting surface 16 of the main body 2 and the side surface 62 of the protection block 60 are connected to the hinge 50 with the angle φ being 180 degrees in a state where they are substantially flush.

[0034] With such a configuration, the protection block 60 can be rotated relative to the side plate 42 by 180 degrees about the mandrel 52 of the hinge 50 (see Fig. 5(b)). That is, the protection blocks 60, 60 are pivotally supported so as to be rotatable about the axis of the mandrel 52 by the hinges 50, 50 provided at the left and right ends of the main body 2 when the fixing portion 40 is attached to the main body 2, and the magnet-attracting surface 16 of the main body 2 can be selectively switched and arranged between the following covered state and exposed state.

[0035] Here, taking the state where the left and right protection blocks 60, 60 are directly below the fixing portion 40 as a reference, the state where the left and right protection blocks 60, 60 are rotated 180 degrees in the clockwise direction (rotation angle θ = -180 degrees) and 180 degrees in the counterclockwise direction (rotation angle θ = 180 degrees) respectively is defined as the "open position P2" (see Fig. 5(b)), and the state where the protection blocks 60, 60 are not rotated (rotation angle θ = 0 degrees) is defined as the "closed position P1" (see Fig. 5(a)). In the open position P2, the magnet-attracting surface 16 of the main body 2 is in an exposed state when the fixing portion 40 is attached to the main body 2, and in the closed position P1, the magnet-attracting surface 16 is in a covered state.

[0036] The area of the upper surface 61 of the protection block 60 preferably has an area that can cover at least 90% of the magnetic attachment surface 16 on the main body 2 as the total area of the two protection blocks 60, 60 when the fixing part 40 is attached to the main body 2 to the closed position P1. This is to improve the stability when the construction tool 1 is placed on a horizontal surface, for example, and to prevent magnetic components and the like from entering through the gap 63 (see Fig. 4(c)) between the two protection blocks 60, 60 and being adsorbed to the magnetic attachment surface 16. Also, by using a soft material, the impact when attracted to an unintended magnetic body can be reduced.

[0037] 〔Magnet sheet piece〕 Magnet sheet pieces 71, 71 are attached at a certain distance on both sides of the hinges 50, 50 provided at the centers of the side surfaces 62, 62 of the protection blocks 60, 60. These magnet sheet pieces 71, 71 are for magnetically attaching to the side plates 42, 42 when the protection blocks 60, 60 are in the open positions P2, P2. Furthermore, magnet sheet pieces 72, 72 are attached to both longitudinal side portions of the upper surfaces 61, 61 of the protection blocks 60, 60. These magnet sheet pieces 72, 72 are for magnetically attaching to the magnetic attachment surface 16 on the main body 2 when the protection blocks 60, 60 are in the closed positions P1, P1 and the fixing part 40 is attached to the main body 2.

[0038] Next, the usage method of the magnetic attachment type construction tool 1 will be described. Fig. 6 is a perspective view for explaining the usage method of the construction tool 1, and Fig. 7 is a side cross-sectional view showing the magnetic circuit formed between the construction tool 1 and the steel frame 4.

[0039] The operation described below is specifically an operation of attaching a gypsum board 6 as a non-magnetic body to a steel frame 4 as a base steel material using a special adhesive 5. This special adhesive 5 is an adhesive having the property of increasing the adhesive strength in a short time by applying a predetermined pressing force, and here it is of a double-sided adhesive tape type.

[0040] First, as shown in Fig. 6(a), a gypsum board 6 is superposed on a steel frame 4 with a special adhesive 5 attached to its surface. As a result, the gypsum board 6 adheres closely to the special adhesive 5, and as shown in Fig. 6(b), the gypsum board 6 is in a temporarily fixed state to the steel frame 4.

[0041] In this temporarily fixed state, a construction tool 1 is prepared. When the construction tool 1 is stored in a dedicated case or the like, since the protection block 60 is in the closed position P1, it is set to the open position P2 (see Fig. 5(c)). In the open position P2, the magnet sheet pieces 71, 71 are magnetically attached to the side plates 42, 42, and the protection blocks 60, 60 are fixed in a fixed position. Then, as shown in Fig. 6(c), the magnetic attachment surface 16 of the construction tool 1 is brought close to the gypsum board 6 and arranged at a portion of the surface of the gypsum board 6 where the steel frame 4 exists. At this time, as shown in Fig. 7, one permanent magnet 20, one base yoke 31, a coupling yoke 32, the other base yoke 31, the other permanent magnet 20, and the steel frame 4 of the construction tool 1 form a magnetic circuit through which a magnetic flux MF with a high magnetic flux density passes. It is a magnetic circuit with the thickness of the gypsum board 6 as an air gap. As a result, the construction tool 1 is magnetically attracted to the steel frame 4 with a large force, and it becomes possible to press the gypsum board 6 against the steel frame 4 with a strong pressing force.

[0042] In this state, as shown by the arrow in Fig. 6(c), by moving the construction tool 1 downward, the area where the construction tool 1 presses the gypsum board 6 against the steel frame 4 moves along the steel frame 4.

[0043] As a result, the portion of the gypsum board 6 facing the steel frame 4 through the special adhesive 5 is pressed with an equal strong pressing force, and the gypsum board 6 is fixedly attached to one steel frame 4 by the special adhesive 5.

[0044] Thereafter, the operation of pressing the gypsum board 6 is similarly performed on the steel frame 4 located adjacent to the steel frame 4 to which the gypsum board 6 is fixedly attached. By repeating such an operation, the gypsum board 6 is attached to the steel frame 4.

[0045] After completing a series of operations, the protection blocks 60, 60 are returned to a dedicated case or the like with the closed positions P1, P1. In the closed positions P1, P1, the magnet sheet pieces 72, 72 are magnetically attached to the magnetic attachment surface 16, and the protection blocks 60, 60 are fixed in a fixed position.

[0046] In this way, with the construction tool 1, when pressing the gypsum board 6 against the steel frame 4, even if the distance to the steel frame 4 is far, a large pressing force can be generated by the magnetic force. Also, when the construction tool 1 is not in use, by arranging the two protection blocks 60, 60 in the closed positions P1, P1, the magnetic attachment surface 16 is in a covered state, and only when using the construction tool 1, by arranging the two protection blocks 60, 60 in the open positions P2, P2, the magnetic attachment surface 16 can be exposed, so accidents due to the magnetic attachment surface 16 can be prevented.

[0047] For the pair of left and right protection blocks 60, in the open position P2, the magnet sheet pieces 71, 71 are magnetically attached to the side plates 42, 42, so they are fixed in a fixed position, and the workability is good. Also, in the closed position P1, the magnet sheet pieces 72, 72 are magnetically attached to the magnetic attachment surface 16, so they are fixed in a fixed position, and the safety of the functional surface 16 can be continuously ensured.

[0048] Also, according to the construction tool 1, the main body 2 and the safety device 3 are detachable without using tools, so the safety of the functional surface 16 can be ensured without changing the structure of the existing main body 2. Also, because the elastic band 41 is used, it can be firmly fixed to the casing 10 of the main body 2. Since the elastic band 41 is stretchable, it can also be applied to casings 10 with different sizes. In addition, it is also possible to integrally fix the safety device 3 to the side surface of the casing main body 11 by screws or the like without making it detachable.

[0049] 〔Safety device of the first modification example〕 FIG. 8 is a perspective view showing the safety device 3A of the first modification example. In the safety device 3A of the first modification example, instead of the side plate 42 in the safety device 3, it has a flat cylinder 42A. Other configurations are the same as those of the safety device 3. The flat cylinder 42A is a rectangular body made of a magnetic metal, similar to the side plate 42, but has a space S1 inside through which the elastic band 41 can be inserted. The elastic band 41 is inserted through this space S1.

[0050] As the flat cylinder 42A, for example, a wide side plate having a longitudinal width more than twice that of the side plate 42 is folded in half along a center line parallel to its longitudinal direction and attached in a form that sandwiches the elastic band 41 so that it can be inserted, and an open end opposite to the fold is sealed with an adhesive. In the safety device 3, the side plate 42 is adhesively fixed in the middle of the elastic band 41. At the fixed part of the side plate 42, the elastic band 41 cannot expand or contract in its longitudinal direction. However, in the safety device 3A, since the elastic band 41 passes through the space S1 of the flat cylinder 42A and is not integrally fixed, the elastic band 41 can expand and contract in its longitudinal direction as a whole. Therefore, the range of application to casings of different sizes is also widened for the safety device 3.

[0051] 〔Safety device of the second modification example〕 FIG. 9 is a perspective view showing the safety device 3B of the second modification example, and FIG. 10 is a perspective view showing a state where the safety device 3B of the second modification example is mounted on the main body 2. In the safety device 3B of the second modification example, the fixing part 40 does not have the elastic band 41 as compared with the safety device 3. Since the side surface of the casing 10 has a strong magnetic attraction force due to the internal permanent magnet 20, the side plate 42 is magnetically attached directly to the side surface of the casing 10. The safety device 3B of the second modification example has a form having two separate bodies independent of each other, but the number of parts is reduced by the amount of the elastic band 41 not being present.

[0052] As described above, the embodiments of the present invention have been described. However, the embodiments disclosed above are merely examples, and the scope of the present invention is not limited to these embodiments. The scope of the present invention is shown by the description in the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. That is, the structure, shape, material, number, mounting position, application, etc. of all or part of the magnetic attachment type construction tool 1 can be appropriately changed in accordance with the gist of the present invention. For example, although the side plate 42 is made of sheet steel, it may be a magnetic sheet. In addition, in the above-described embodiment, a magnetic attachment type construction tool having a magnetic attachment surface as a functional surface is shown, but it may be applied to, for example, an iron in which the functional surface generates high heat. In this case, it is preferable that the protective block is made of, for example, a ceramic having excellent heat resistance.

Industrial Applicability

[0053] It can be widely used as a handheld functional tool that can prevent unexpected accidents caused by the functional surface.

Explanation of Reference Numerals

[0054] 1 Construction tool (handheld functional tool) 2 Main body (functional tool main body) 16 Magnetic adsorption surface (functional surface) 30 Handle 50 Hinge 52 Mandrel (shaft) 60 Protective block 71 Magnetic sheet piece (fixing member) 72 Magnetic sheet piece (fixing member) P1 Closed position P2 Open position θ Rotation angle

Claims

1. In a handheld functional instrument having a functional instrument body with a functional surface on the bottom surface and a handle integrated with the functional instrument body, a pair of left and right protection blocks are pivotally supported around the axis of a hinge provided at each of the left and right ends of the functional instrument body so as to be rotatable around the axis of the hinge, and open and close in a butterfly fashion from the functional surface, and can be selectively arranged in a closed position where the functional surface is covered and an open position where the functional surface is exposed. The handheld functional instrument is characterized by comprising a pair of left and right protection blocks.

2. Among the pair of left and right protection blocks, the rotation angle when one protection block is arranged from the closed position to the open position and the rotation angle when the other protection block is arranged from the closed position to the open position are 180 degrees in the clockwise direction and 180 degrees in the counterclockwise direction, respectively. The handheld functional instrument according to Claim 1.

3. The handheld functional instrument according to Claim 2, comprising fixing members for fixing the pair of left and right protection blocks in a fixed position at the open position and the closed position, respectively.

4. The handheld functional instrument according to Claim 3, having fixing portions for fixing a pair of left and right protection blocks pivotally supported around the axis of the hinge by the hinge to the left and right ends of the functional instrument body, and the fixing portions are detachable from the functional instrument body without tools.

5. The handheld functional instrument according to any one of Claims 1 to 4, wherein the functional surface is a magnetically adsorbing surface.

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