JP6736721B1 - Cutter knife holder and cutter knife - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique effective for further improving the gripping property of a cutter knife or its holder by an operator. SOLUTION: In the holder 2 of a cutter knife 1, a grip portion 10 is formed as an elongated body having a cutter blade sliding direction as a longitudinal direction, and an operator grips the grip portion 10 with a hand H. In this state, the holder 2 of the cutter knife 1 is characterized in that it has a projecting curved surface portion 15 capable of substantially surface contact with the palm concave portion PV formed between the ball of the operator's palm and the little ball of the operator. .. [Selection diagram]

Description

TECHNICAL FIELD The present invention relates to a technique for improving gripping performance based on ergonomics in a cutter knife holder and a cutter knife.

Regarding the configuration related to the cutter knife (or its holder), for example, the one disclosed in JP 2012-40142 A (Patent Document 1) is known.
In the said patent document 1, in addition to the cutting operation by a cutter blade, the technique of improving the versatility of a cutter knife by adding a driver function further is employ|adopted.

Further, in Patent Document 1 described above, as shown in FIGS. 3 and 4, etc., the holder is easy to grasp by forming a cross section of the holder in the longitudinal direction of the cutter knife into a curved shape. There is.

In the technique disclosed in Patent Document 1 described above, a device for surely improving the gripping property of the operator is made, but the cutter knife is used in a state in which a relatively strong pressing force is applied by fingers. Therefore, there is a demand for further improvement in the grip of the operator. Such a request is particularly prominent in the professional use field where work is continuously performed for a long time.
JP 2012-4012 A

The present invention has been made in view of the above points, and an object of the present invention is to provide a technique effective for further improving the gripping property of a cutter knife or its holder by an operator.

The present invention is configured to solve the above problems. According to the present invention, a cutter holder that has a blade accommodating portion that slidably accommodates a cutter blade and a grasping portion that is used for grasping by a worker's hand is configured. The gripping portion is formed as a long body having a sliding direction of the cutter blade as a longitudinal direction, and an intermediate region of the long body and a first end on a side proximate to the tip of the cutter blade in the longitudinal direction. It has a partial region and a second end region on the separated side. In addition, the intermediate region is a projecting curved surface portion that can be substantially in surface contact with a palm concave portion formed between the ball of the thumb and the little ball of the operator's palm when the operator holds the gripping portion by hand. Have. Further, the first end region has a pressing portion on which a pressing force by a finger pressure of an operator acts when the cutting work by the cutter blade is performed.

The holder of the cutter knife according to the present invention is applicable to both general-purpose products for general use and professional-use products. It has a high affinity for professional-use products that perform regular work.
The blade accommodating portion may be configured to be slidable through a manual operation against the biasing force while holding and holding the cutter blade in the blade accommodating portion using the biasing force of a predetermined elastic body. Alternatively, it may be configured so as to be slidable through the screw-releasing operation while being positioned and held in the blade accommodating portion through the screw-fastening operation.

The “intermediate region” of the elongated body is not limited to the geometrical center region of the elongated body, and widely includes the area between the first end region and the second end region. Is.
The "first end region" of the elongated body is defined as an end region on the side closer to the tip of the cutter blade in the longitudinal direction. The "proximity" means that the cutter blade is slidably accommodated. It corresponds to the end on the side closer to the tip, in other words, it corresponds to the front end of the elongated body when performing a cutting operation using a cutter blade.

On the other hand, the “second end region” of the elongated body is defined as a side end region that is separated from the tip of the cutter blade in the longitudinal direction. The “separation” is the first end region in the longitudinal direction. It corresponds to the end on the side farther than the end region, in other words, corresponds to the rear end of the elongated body when performing a cutting operation using a cutter blade.

The “bulb ball” of the operator's palm corresponds to a hill-shaped portion formed substantially along the extending direction of the thumb (first finger) on the base side of the thumb of the operator's palm, The “little finger ball” corresponds to a hill-shaped portion formed substantially along the extending direction of the little finger (fifth finger) on the base side of the little finger in the palm of the operator. The “palm recess” corresponds to a depression (basin)-shaped recessed region (low-level region) formed between the two hill-shaped portions of the thumb ball and the little finger ball in the palm of the operator.

The projecting curved surface portion of the present invention is configured so as to be substantially in surface contact with the palm concave portion. “Surface contact” is typically a mode in which the curved surface of the projecting curved surface portion is in close contact with the palm concave portion to minimize the gap between the projecting curved surface portion and the palm concave portion. This is the case. From the viewpoint of minimizing the gap, it includes a form in which a partial void is completely eliminated or a form substantially equal to that between the convex curved surface portion and the palm concave portion. Further, it is possible to appropriately adjust the surface contact performance of the projecting curved surface portion in accordance with the assumed work environment in consideration of the influencing factors such as the country in which the holder is used, sex, and age. For example, in a country or region where there are many large workers, the protruding curved surface portion is formed relatively large, and conversely, in a country or region where there are many small workers, the protruding curved surface portion is formed relatively small. This is the case of localization of.

Further, the pressing portion according to the present invention is provided in the first end portion area, and is configured to exert a pressing force by an operator's finger pressure when the cutting work by the cutter blade is performed.
Typically, in a cutting operation using a cutter blade, a finger force of the first finger (thumb) is applied to the pressing portion in a state in which the grip portion is firmly gripped by using the second to fifth fingers, so that the cutting force is increased. This corresponds to the mode in which the cutting operation is performed while controlling the.

At this time, as described above, the projecting curved surface portion provided in the intermediate region of the gripping portion substantially comes into surface contact with the palm concave portion of the operator to maintain a close contact state, so that the operator grips the holder. It is not necessary to pay extra attention to, and finger pressure can be applied to the pressing portion to concentrate on the cutting work. For example, even in the above-mentioned conventional technique, the gripping property of the worker can be secured to some extent by forming the gripping portion cross section into a curved shape. However, in the present invention, the projecting curved surface portion in the intermediate region of the gripping part is formed by the operator. By making the surface contact with the palm concave portion and maintaining the close contact with the palm concave portion, an ergonomically appealing holder structure that is more advanced than the conventional technique can be secured.

As described above, by constructing a holder having an ergonomically superior structure, "the grip portion is in close contact with the palm"-"easy to grip"-"no extra effort is required for gripping, and it is easy to concentrate on pressing" -A work sequence that "cutting work is easy to perform"-"Useless labor for gripping is unnecessary and tired after long-time work" is secured, which can contribute to workability improvement with a cutter knife. ..

Further, from the viewpoint of improving the functionality or increasing the functionality of the cutter knife, a scraper having a tip protruding portion is provided on the second end region side. The scraper is also called a “spa” and is a functional member for performing a piercing operation on a work target or a cutting operation subsequent to the piercing operation.
Due to the relationship that the second end region side is assigned to a functional member different from the cutter blade, the operator grips the gripping part by turning the gripping part upside down when using the scraper. At this time, the above-mentioned projecting curved surface portion is prevented from interfering with gripping by the operator when the scraper is used. Therefore, in the present invention, in the gripping state for performing work by the scraper, the projecting curved surface portion is configured to be provided in the finger contact avoidance region where contact with the operator's finger is avoided. .. As a result, it is possible to improve the gripping property of the cutter blade during the work and avoid the obstacle during the work by the scraper.

The palm recess typically includes at least a part of the operator's thumb line, proximal palm line, and distal palm line. The ball of thumb is a line that extends in the vicinity of the ball of the ball along the ball of the ball and is also called a lifeline. The proximal palmer line is a line that extends in a branched manner from the thumb line and is also called an intelligence line. The distal palm line is a line extending substantially parallel to the proximal palm line and is also called an emotion line. "Including at least a part" preferably includes any of a mode in which the palm recess includes a part of these three lines, a mode in which all of the three lines are included, and a mode in which a part of each line is included. ..

It is preferable that the projecting curved surface portion is provided at a position closer to the second end region than the center of the grip portion in the longitudinal direction. In general, when performing a cutting operation with a cutter blade, due to the structure of the hand, it tends to be rational to apply a pressing force by finger pressure to the front side while gripping the rear side of the grip portion. In view of this point, by arranging the protruding curved surface portion at a position closer to the second end region than the center of the grip portion, in other words, on the rear side of the grip portion, the cutting work by the cutter blade is facilitated. Can be secured.

Further, the projecting curved surface portion has a bulging portion (also referred to as a bulging region) having a predetermined curvature and a bulging angle in a direction intersecting the operator's thumb line, proximal palm line and distal palm line. It is preferable to have. Further, it is preferable that the bulging portion is configured so as to be substantially in surface contact with the palm concave portion in a state where an operator holds the gripping portion by hand. With such a configuration, the bulging portion of the protruding curved surface portion substantially comes into surface contact with the palm concave portion, whereby the gripping property is improved. In addition, the above-mentioned "direction crossing the operator's thumb line, proximal palm line, and distal palm line" is a direction that substantially crosses the longitudinal direction of the grip portion when the worker grips the grip portion. (For example, a direction substantially orthogonal to each other).

From the viewpoint of improving the gripping property, it is preferable that the predetermined curvature of the bulging portion be within a range of approximately R10 to R21. Particularly, by setting the curvature to be in the range of approximately R13 to R16, the gripping property can be further improved.

The bulging angle of the bulging portion is preferably in the range of approximately θ1=115° to 135°. In particular, by setting the bulge angle to be in the range of approximately θ1=120° to 125°, the gripping property can be further improved.

Further, the projecting curved surface portion extends from the bulging portion to the first end region side in the longitudinal direction, and the bulging portion extends from the bulging portion to the second end region side. It is preferable to have the second protruding curved surface portion that extends. In this case, it is preferable that the first protruding curved surface portion is set to be approximately 50% or more and approximately 90% or less of the length from the bulging portion to the first end region in the longitudinal direction. .. Further, it is preferable that the second projecting curved surface portion is set to be approximately 50% or more and 90% or less of a length from the bulged portion to the second end region in the longitudinal direction. With such a configuration, it is possible to secure a gripping structure having a higher compatibility with the structure of the hand of the operator in a state where the bulging portion is substantially in surface contact with the palm recess.

Further, it is preferable that the inclination angle of the second projecting curved surface portion with respect to the longitudinal direction is set to be larger than the inclination angle of the first projecting curved surface portion with respect to the longitudinal direction. With this configuration, it is possible to secure a gripping structure that is close to the shape of the hand of the operator in the gripped state in a state where the bulging portion is in substantially surface contact with the palm recess.

Further, the second end portion side gripping area has a second end portion side gripping area configured to be in surface contact with an annular area formed by the fifth finger and the little finger ball in the gripping state, and the second end side gripping The region is preferably dimensioned so that the fifth finger in the grasped state can contact or approach the little finger ball. With this configuration, the operator holds the gripping portion while firmly exerting the gripping force on the fifth finger side in a state where the annular area on the fifth finger (pinky) side is in close contact with the second end side gripping area. It can be held, and the gripping property is further improved. In particular, there is a case where a functional member of another type (for example, a scraper described later) is provided on the rear end side of the cutter knife from the viewpoint of making the cutter knife multifunctional. As a result, the size of the second end region side tends to increase, and as a result of such size increase, it becomes difficult to bring the fifth finger of the worker close to the little finger ball in the gripping state, and the gripping force on the side of the fifth finger is firmly applied. It is assumed that the situation is difficult. According to the present invention, such concerns are eliminated and the improvement of the gripping performance is surely ensured.

Further, a second finger locking portion capable of locking the second finger when an operator presses the pressing portion with the first finger is provided on the side of the first end region facing the pressing portion. Is preferred. When performing a cutting operation with a cutter blade, it is assumed that a finger pressure is often applied to the pressing portion with the first finger (thumb) while grasping the grasping portion with the second finger (index finger) to the fifth finger (little finger). However, in this case, by locking the second finger with the second finger locking portion, there is a concern that the finger may be displaced and workability may be deteriorated.

In the above-mentioned piercing work, if the piercing performance of the scraper is too high, there is a concern that the product etc. may be carelessly damaged during the work. On the other hand, if such a risk is avoided and the piercing performance of the scraper is reduced, the workability itself will be reduced this time. In order to rationally solve such a trade-off between the extreme sharpness avoidance of the scraper and the workability deterioration due to the sharpness avoidance, about R=2.0 to 2.5 of the scraper tip projection portion. It is preferable to have any curvature within the range. In particular, the above-mentioned problem can be more surely solved by configuring the tip projection of the scraper to have a curvature in the range of approximately R=2.1 to 2.4.

From the same viewpoint, it is preferable that the tip end protruding portion of the scraper is configured to have any inclination angle within the range of approximately θ2=40° to 60°. Further, the above-mentioned problem can be more surely solved by configuring the tip portion of the scraper to have an inclination angle within the range of approximately θ2=44° to 56°.

Further, in the present invention, it is preferable to configure a cutter knife holder and a cutter knife having a cutter blade slidably accommodated in the blade accommodating portion. With such a configuration, it is possible to provide a cutter knife that is highly ergonomic and can reliably ensure usability even in the field of professional use.

An embodiment of the present invention will be described with reference to FIGS.
As described above, the present invention is a technique relating to the improvement of the grip performance based on the ergonomics of the cutter knife or the holder thereof. First, the structure of the hand of the operator involved in grip will be described first.

(Confirming the structure of the operator's hand based on an ergonomic viewpoint)
FIG. 1 shows a schematic structure in which an operator opens his hand H and points his palm (the right hand is shown in FIG. 1 for convenience). Of the operator's fingers, the first finger corresponding to the thumb (or thumb) is F1 (Finger-1), the second finger corresponding to the index finger (or index finger) is F2, the third finger corresponding to the middle finger is F3, The fourth finger corresponding to the ring finger (or ring finger) is defined as F4, and the fifth finger corresponding to the little finger is defined as F5.

Furthermore, regarding the palm portion of the operator, the hill-shaped portion formed on the base side of the first finger F1 is the thumb ball PH1 (Palm Hill-1), and the hill-shaped portion formed on the base side of the fifth finger F5 is the little finger. It is defined as sphere PH2.

Further, regarding the palm portion of the worker, the thumb line is defined as PL1 (Palm Line-1), the proximal palm line is defined as PL2, and the distal palm line (or also called emotion line) is defined as PL3. The thumb line PL1 is a line that extends in the vicinity of the ball PH1 along the ball of thumb PH1 and is also called a “ball of the foot”, a “ball of the ball of the ball”, or a “lifeline”. .. The proximal palm line is a line extending from PL2 and the thumb line PL1 in a branched manner, and is also referred to as “proximal palm skin line” and “intelligence line”. The distal palm line PL3 is a line extending substantially parallel to the proximal palm line PL2, and is also referred to as “distal palm skin line” or “emotion line”.

Furthermore, between the ball of thumb PH1 and the ball of little finger PH2, the depression-like low region of the depression (basin) formed by including the thumb line PL1, the proximal palm line PL2, and the distal palm line PL3, the palm depression It is defined as PV (Palm Valley).
In the present embodiment, the palm depression PV is defined to include all of the thumb line PL1, the proximal palm line PL2, and the distal palm line PL3, but differences in palm structure due to race, living environment, and the like. Accordingly, it is sufficient to include at least a part of the thumb line PL1, the proximal palm line PL2, and the distal palm line PL3.

FIG. 2 shows a state in which the fingers of the operator's hand H having the above structure are bent in order to grasp a cutter knife which will be described in detail below.
That is, the hand H is placed in a grasped state by bending the first finger F1 and bending the second finger F2 to the fifth finger F5 in parallel. At this time, the ball-side annular grip portion formed by the second finger F2 and the ball PH1 is defined as R1, and the little-ball side ring grip formed by the fifth finger F5 and the little ball PH2 is defined as R2. .. At this time, as described above, between the thumb ball side annular grip portion R1 and the little finger ball side annular grip portion R2, the state of including the thumb line PL1, the proximal palm line PL2, and the distal palm line PL3. Palm recess PV is formed.

(Overall structure of cutter knife)
Next, the structures of the cutter knife 1 and the holder 2 according to the embodiment of the present invention will be described with reference to FIGS. 3 to 8. The cutter knife 1 is an example of the “cutter knife” in the present invention, and the holder 2 is an example of the “holder” in the present invention.
FIG. 3 is a schematic front view showing the overall configuration of the cutter knife 1 and the holder 2. FIG. 4 is a schematic plan view showing a state in which the cutter knife 1 and the holder 2 are viewed from above. 5 and 6 are a schematic sectional view and a schematic perspective view showing the characteristic structure of the holder 2 based on ergonomic considerations. Further, FIG. 7 is a schematic diagram showing a state in which the cutter knife 1 is gripped for use in cutting work, and FIG. 8 shows a state in which the cutter knife 1 is gripped in a front-rear direction for use in scraper work. It is a schematic diagram.

As shown in FIG. 3, the cutter knife 1 has a holder 2 and a cutter blade 5. A predetermined standard product is used as the cutter blade 5, and a detailed description thereof will be omitted for convenience.
The holder 2 has a blade accommodating portion 3 and a grip portion 10. The blade accommodating portion 3 is a long metal member configured to accommodate the cutter blade 5. A slider 6 is provided in the blade accommodating portion 3, and the slider 6 locks the cutter blade 5 integrally via the engaging portion 7. The cutter blade 5 is slidable in the long-axis direction LD1 in a state of being housed in the blade housing portion 3 in accordance with a manual operation of the slider 6.

In the present embodiment, a metallic elastic body (not shown) is interposed between the slider 6 and the blade housing portion 3, and the elastic body engages with the latch 4 to position the cutter blade 5. (Protrusion position from the blade housing portion 3 or complete storage in the blade housing portion 3) is performed. Note that the sliding operation of the slider 6 and the cutter blade 5 is a well-known matter, and detailed description thereof will be omitted in this specification for convenience.

(Structure of grip part 10)
The holder 2 has a grip portion 10 that is used by an operator to grip the cutter knife 1 by hand. The detailed structure of the grip portion 10 is shown in FIGS. 3 to 5.
The grip portion 10 extends in the longitudinal direction LD1 in a state where a plurality of grip groove portions 17 are formed at predetermined distances, and has a long length including a first end region 11, a second end region 12, and an intermediate region 13. Configured as body 14. For convenience of explanation, the grip groove 17 is not shown in FIG.

The intermediate region 13 is defined as a region between the first end region 11 and the second end region 12. Then, as shown in FIGS. 4 and 5, a projecting curved surface portion 15 is formed in the intermediate region 13. The projecting curved surface portion 15 is formed mainly on the side closer to the second end region 12 than the gripping portion central region C, and has a bulging portion 16. The bulging portion 16 is provided closer to the second end region 12 than the gripping portion central region C, and the cross-sectional structure thereof is schematically shown in FIG.

(Structure of the bulging portion 16)
The bulging portion 16 shown in FIGS. 4 and 5 may be set to have a curvature within a range of approximately R10 to R21 from the viewpoint of improving the gripping property based on the ergonomic viewpoint described below. preferable. Particularly, by setting the curvature to be in the range of approximately R13 to R16, the gripping property can be further improved. In the present embodiment, the curvature of the bulging portion 16 is set to R15 as an example.

Similarly, from the viewpoint of improving the gripping property, it is preferable that the bulging angle of the bulging portion 10 be within the range of approximately θ1=115° to 135°. In particular, by setting the bulge angle to be in the range of approximately θ1=120° to 125°, the gripping property can be further improved. In the present embodiment, the bulging angle θ1 (see FIG. 5) of the bulging portion 16 is set to 122° as an example.

(Structure of the bulging portion 16 from an ergonomic viewpoint)
By setting the curvature of the bulging portion 16 and/or the bulging angle, the holder 2 according to the present embodiment is significantly improved in gripping property from an ergonomic viewpoint. To explain this, the characteristic structure of the bulge 16 is shown in detail in FIG. Note that, in FIG. 6, for convenience of description, the grip portion 10 is schematically shown together with a cross section of a portion where the bulging portion 16 is located. As shown in FIG. 6, when the operator grips the cutter knife 1 or the holder 2 according to the present embodiment with the hand H, the bulging portion in the projecting curved surface portion 15 of the gripping portion 10 with respect to the palm recess PV. The 16 contacts in close contact with each other in a substantially surface-contact manner. In particular, with respect to the direction crossing the thumb line PL1, the proximal palm line PL2, and the distal palm line PL3 shown in FIGS. 1 and 2 (that is, the direction crossing the longitudinal direction LD1 in the grip portion 10 shown in FIG. 3), The protruding portion 16 can be brought into extremely close contact with the palm concave portion PV, and ergonomically excellent gripping performance is imparted.

As shown in FIG. 4, the protruding curved surface portion 15 has a first protruding curved surface portion 15A extending from the bulging portion 16 toward the first end region 11 side and a bulging portion 16 in the longitudinal direction LD1. It can be divided into the second projecting curved surface portion 15B extending to the second end region 12 side. In this case, the length L11 of the first projecting curved surface portion 15A may be set within the range of approximately 50% to approximately 90% of the length (distance) L12 from the bulging portion 16 to the first end region 11. preferable. In this embodiment, it is set to be 75%.

The length L21 of the second protruding curved surface portion 15B is preferably set within a range of approximately 50% to approximately 90% of the length L22 from the bulge portion 16 to the second end region 12. In this embodiment, it is set to be 75%.

With such a configuration, in the state where the bulging portion 16 is in surface contact with the palm concave portion PV, it is possible to secure a gripping structure having higher compatibility with the structure of the hand of the operator. That is, the first projecting curved surface portion 15A can sufficiently maintain surface contact with the region from the palm concave portion PV to the ball side annular gripping portion R1 in the gripped state of the operator shown in FIG. It is possible (see also FIG. 2 etc.). On the other hand, the second projecting curved surface portion 15B can sufficiently maintain surface contact with the region from the palm concave portion PV to the little finger ball side annular grip portion R2.

Further, as shown in FIG. 4, in the present embodiment, the inclination angle of the second projecting curved surface portion 15B with respect to the longitudinal direction is set to be larger than the inclination angle of the first projecting curved surface portion 15A with respect to the longitudinal direction. ing. As a result, in the state where the bulging portion 16 is in surface contact with the palm recess PV, it is possible to secure a gripping structure that is closer to the shape of the gripped worker's hand.

(Structures of the pressing portion 21 and the second finger locking portion 22)
Further, as shown in FIG. 3, a pressing portion 21 and a second finger locking portion 22 are formed in the first end region 11 of the grip portion 10. The pressing portion 21 is defined as an area for the operator to press the cutter knife 1 to the work target with fingers when performing the cutting work using the cutter blade 5. It is assumed that the worker typically has a usage pattern in which the pressing portion 21 is pressed by the first finger F1, but a mode in which the operator presses the pressing portion 21 by another finger (for example, the second finger F2) or another finger It is preferably included. Further, the second finger locking portion 22 is defined as an area for locking the second finger F2 of the worker to facilitate the work when performing the cutting work using the cutter blade 5. In the present embodiment, the second finger locking portion 22 is assumed to be in a usage form in which the second finger F2 of the worker is locked, but of course, it is possible to lock another finger in the actual work. It does not hinder.

(Centering around the configuration of the gripping area on the second end area side)
Further, as shown in FIGS. 3 and 4, the grip portion 10 has a second end area grip portion 23 and a scraper 31 in the second end area 12 in the longitudinal direction LD1. The second end region side gripping region 23 is defined as a gripping region on the side that abuts the little finger ball side annular gripping part R2 of the operator shown in FIG. 2 during the cutting work using the cutter blade 5 shown in FIG. (See also FIG. 7 for this).

The second end region-side gripping portion 23 substantially corresponds to the length dimension of the little finger ball-side annular gripping portion R2 of the operator shown in FIG. 2 during the cutting work using the cutter blade 5. The size of the fifth finger F5 of the worker in the state is set so that the fifth finger F5 can contact or approach the little finger ball PH2.

(Structure of contact smoothing processing area 24 when using scraper)
Further, FIG. 8 shows a state in which the cutter knife 1 shown in FIG. 3 is gripped backward and forward with respect to the longitudinal direction LD1 and the scraper 31 is used. As shown in FIG. 8, the second end region 12 (or the second end region side gripping region 23) is formed with a smooth surface from which unnecessary protrusions, burrs at the time of molding, etc. are removed. This smooth surface constitutes the “contact smoothing processing region 24” which is set so as not to hinder the work progress of the worker when the scraper 31 is used. In other words, “the holder of the cutter knife according to the present invention, the second end region or the second end-side gripping region corresponds to a contact portion of the operator's finger when the scraper is used. The contact smoothing processing area" is adopted.
The contact smoothing processing area 24 is effective for avoiding obstruction of the contact/pressing operation of the first finger F1 of the operator when the scraper 31 is used.

(Mainly the configuration of scraper 31)
The scraper 31 is a metal member also called a “spatula” and is used for piercing work or piercing and cutting work. As one of typical work modes, a tape-corrugated cardboard storage box is pierced with the tape to cause the scraper 31 to enter the inside of the cardboard storage box, and in that state, the scraper 31 is pulled. By doing so, the operation of cutting the tape and thereby opening the storage box corresponds to this.

(Structure of Tip Protrusion 32 of Scraper 31)
As shown in FIG. 3, a tip projection 32 is formed on the free end side of the scraper 31 so that the piercing work or the cutting work together with the piercing work can be performed.

When performing a piercing operation via the tip protrusion 32, if the tip protrusion 32 is too sharp to improve the piercing performance, the product or the like may be inadvertently damaged during the operation. On the contrary, if the piercing performance is lowered, the workability itself will be lowered. As a solution to such a trade-off between the extreme sharpness avoidance and the workability deterioration caused by the sharpness avoidance, the tip protrusion 32 is set to have a curvature within a range of approximately R=2.0 to 2.5. It is preferable to be configured to have. In particular, the above-mentioned problem can be more surely solved by configuring the tip projection 32 to have any curvature within the range of approximately R=2.1 to 2.4. In the present embodiment, the curvature of the tip protruding portion (see FIG. 3) is set to R2.3 as an example.

From the same viewpoint, it is preferable that the tip projection 32 of the scraper 31 be configured to have any inclination angle within the range of approximately θ2=40° to 60°. Furthermore, the above-mentioned problem can be more surely solved by configuring the distal end protruding portion 32 to have an inclination angle within the range of approximately θ2=44° to 56°. In the present embodiment, the protrusion angle θ2 (see FIG. 3) of the tip protrusion 32 is set to 50° as an example.

(Compatibility between the scraper 31 and the second end side gripping area 23 in the second end area 12)
In the cutter knife 1 according to the present embodiment, while the scraper 31 is arranged in the second end region 12, while the size of the second end region 12 is appropriately set, the strength required during work with the scraper 31 can be improved. The rigidity is properly secured. On the other hand, as for the second end side gripping region 23 formed in the second end part region 12, as shown in FIG. 7, at the time of cutting work using the cutter blade 5, the little finger ball side annular grip of the worker is performed. Approximately corresponding to the length dimension of the portion R2, the fifth finger F5 of the operator in the grasped state is set to have a dimension that can contact or approach the little finger ball PH2. That is, the second end region 12 is configured to satisfy both requirements of ensuring strength and rigidity for work with the scraper 31 and improving gripping property when working with the cutter blade 5.

(Operation/effect in the embodiment)
The cutter knife 1 and its holder 2 according to this embodiment are configured as described above. Since the curvature R of the bulging portion 16 and the bulging angle θ1 are particularly devised, the operator grips the cutter knife 1 or the holder 2 according to the present embodiment with the hand H as shown in FIG. When the cutting operation is performed in this state, the bulging portion 16 comes into close contact with the palm concave portion PV in a substantially surface contact state, and the ergonomically excellent gripping performance is achieved by the cutter knife 1 and the holder. It is given to 2.

That is, if the operator naturally grips the holder 2, the holder 2 can be reliably gripped in that state, and the cutting work is performed by applying finger pressure to the pressing portion 21 without paying extra attention for gripping. You can concentrate on This will ensure a stress-free working environment. The embodiment of the ergonomics appealing type can sufficiently exert its effect even in the area of professional use where it is easy to require strong work or long work.

Further, as described above, the second end region side gripping portion 23 substantially corresponds to the length dimension of the little finger ball side annular gripping portion R2 of the operator shown in FIG. 2 during the cutting work using the cutter blade 5. Is configured. Therefore, during the cutting work by the cutter blade 5 shown in FIG. 7, the worker holds the little finger ball side annular region R2 in close contact with the second end side holding region 23 and the gripping force of the fifth finger F5 side. It is possible to hold the grip portion 10 while firmly working, and further improve the grip performance.

Further, in the cutting operation, the worker can stably apply the finger pressure by the first finger F1 to the pressing member 21 while the second finger F2 is locked to the second finger locking portion 22 (FIG. 7). reference).
Due to these synergistic effects, the maximum efficiency of gripping property and workability is achieved.

On the other hand, as shown in FIG. 8, when the cutter knife 1 according to the present embodiment is gripped backward and forward with respect to the longitudinal direction LD1 and the scraper 31 is used for working, the second end region 12 to the second end described above are used. When the partial region side gripping region 23 is located at the front end, the bulging portion 16 (see also FIGS. 4 and 5) of the gripping part 10 is used when performing the scraper work shown in FIG. Should be located in the finger contact avoidance region 33 so as not to be an unnecessary work obstacle for the hand H or the first finger F1 to the fifth finger F5 in the state where the grip portion 10 is gripped backward and forward. Is configured. Further, since the contact smoothing processing region 24 described above is located on the front side, smooth work can be ensured without causing work hindrance to the first finger F1 of the worker who performs the scraper work. Become. That is, according to the cutter knife 1 or the holder 2 according to the present embodiment, not only the cutting work using the cutter blade 5 shown in FIG. 7 but also the piercing/cutting work without the piercing using the scraper 31 shown in FIG. Also in the above, it is possible to provide a work environment excellent in workability and fatigue suppression of the worker, based on an ergonomic viewpoint.

A schematic structure is shown in which the operator opens his hand H and points his palm. The hand H of the operator in a state where the fingers are bent to hold the cutter knife is schematically shown. It is a front schematic diagram showing the whole cutter knife 1 and holder 2 composition concerning an embodiment of the present invention. It is a plane schematic diagram showing the state where cutter knife 1 and holder 2 concerning an embodiment of the present invention were seen from the upper surface. It is a cross-sectional schematic diagram which shows the characteristic structure of the holder 2. It is a perspective schematic diagram which shows the characteristic structure of the holder 2. It is a mimetic diagram showing the state where it grasped in order to use for the cutting operation of cutter knife 1 concerning an embodiment of the present invention. It is a schematic diagram which shows the state which grasped the cutter knife 1 which concerns on embodiment of this invention in the front-back reverse for using for scraper work.

1 cutter knife
2 Holder 3 Blade housing
4 Latch 5 Cutter blade
6 slider
7 Engagement part
10 Gripping Part 11 First End Area
12 Second end area
13 Intermediate area
14 Long body
15 Projected curved surface
16 bulge
17 Gripping groove portion 21 Pressing portion
22 Second finger locking part
23 Second end area side gripping area
24 Contact smoothing area
31 scraper
32 Tip protrusion
33 Finger contact avoidance region LD1 Longitudinal direction C Gripping center region H Worker's hand PL1 Gross line (bulb ball, lifeline)
PL2 proximal palm line (proximal palm skin line, intelligence line)
PL3 distal palm (distal palm skin line, emotional line)
PH1 thumb ball PH2 little ball PV palm palm recess F1 first finger (thumb, thumb)
F2 second finger (index finger, index finger)
F3 3rd finger (middle finger)
F4 4th finger (ring finger, ring finger)
F5 5th finger (pinkie)
R1 A ball-side annular grip formed by the second finger and the ball in the grasped state R2 A ring-shaped annular grip formed by the fifth finger and the little finger in the gripped state

Claims (17)

A cutter knife holder,
A blade accommodating portion for slidably accommodating the cutter blade, and a grasping portion used for grasping by a hand of an operator,
The gripping portion is formed as a long body having a sliding direction of the cutter blade as a longitudinal direction, and an intermediate region of the long body and a first end on a side proximate to the tip of the cutter blade in the longitudinal direction. A partial region and a second end region on the side to be separated from each other,
The intermediate region is a projecting curved surface portion capable of substantially surface contact with a palm concave portion formed between the ball of the thumb and the little finger of the operator's palm when the operator holds the gripping portion by hand. Have
The first end region has a pressing portion on which a pressing force by an operator's finger pressure acts when the cutting operation by the cutter blade is performed,
A scraper having a tip protrusion is provided on the second end region side,
A holder for a cutter knife, wherein the projecting curved surface portion in a gripping state for performing work by a scraper is provided in a finger contact avoidance region where contact with a finger of an operator is avoided. It is a holder of the cutter knife of Claim 1, Comprising: The said palm recess part is comprised including at least one part of a worker's thumb line, a proximal palm line, and a distal palm line. Holder for a cutter knife. A holder for a cutter knife according to claim 1 or 2, wherein
The cutter knife holder, wherein the protruding curved surface portion is provided at a position closer to the second end region than the center of the gripping portion in the longitudinal direction. A holder for a cutter knife according to any one of claims 1 to 3,
The projecting curved surface portion has a bulge portion having a predetermined curvature and a bulge angle in a direction intersecting the operator's thumb line, proximal palm line and distal palm line, and the bulge portion is A holder for a cutter knife, characterized in that the operator is configured to make substantially planar contact with the palm concave portion in a state where an operator holds the grip portion by hand. A holder for a cutter knife according to claim 4, wherein
The cutter blade holder is characterized in that the bulged portion has a predetermined curvature within a range of approximately R10 to R21. A holder for a cutter knife according to claim 4, wherein
The cutter knife holder is characterized in that the predetermined curvature of the bulged portion is set within a range of approximately R13 to R16. A cutter knife holder according to any one of claims 4 to 6, comprising:
A cutter knife holder characterized in that the bulging angle of the bulging portion is set in a range of approximately θ1=115° to 135°. A cutter knife holder according to any one of claims 4 to 6, comprising:
A cutter knife holder characterized in that the bulging angle of the bulging portion is set within a range of approximately θ1=120° to 125°. A cutter holder of the knife according to any one of up to claims 4-8,
The projecting curved surface portion extends from the bulging portion toward the first end region side in the longitudinal direction, and the bulging portion extends from the bulging portion toward the second end region side. Has a second protruding curved surface portion present,
The first projecting curved surface portion is set to be approximately 50% or more and approximately 90% or less of the length from the bulging portion to the first end region in the longitudinal direction, and the second The protruding curved surface portion is set so as to be approximately 50% or more and 90% or less of the length from the bulged portion to the second end region in the longitudinal direction. holder. A holder for a cutter knife according to claim 9, wherein
A cutter knife holder, wherein the inclination angle of the second projecting curved surface portion with respect to the longitudinal direction is set to be larger than the inclination angle of the first projecting curved surface portion with respect to the longitudinal direction. A cutter knife holder according to any one of claims 1 to 10, wherein
The second end region is
There is a second end region side gripping region configured to be capable of surface contact with an annular region formed by the fifth finger and the little finger ball in the gripping state, and the second end part side gripping region is the fifth finger in the gripping state. A holder for a cutter knife, characterized in that the size is set so that it can contact or approach the little finger ball. A cutter knife holder according to any one of claims 1 to 11, comprising:
A second finger locking portion capable of locking the second finger when an operator presses the pressing portion with the first finger is provided on a side of the first end region facing the pressing portion. Cutter knife holder characterized by. A cutter knife holder according to any one of claims 1 to 12,
The cutter knife holder, wherein the tip end protrusion of the scraper is configured to have any curvature within a range of approximately R=2.0 to 2.5. A cutter knife holder according to any one of claims 1 to 12,
The cutter knife holder, wherein the tip of the scraper is configured to have any curvature within a range of approximately R=2.1 to 2.4. A cutter knife holder according to any one of claims 1 to 14,
The cutter knife holder, wherein the tip of the scraper is configured to have an inclination angle within a range of approximately θ2=40° to 60°. A cutter knife holder according to any one of claims 1 to 14,
A holder for a cutter knife, wherein the tip projection of the scraper is configured to have an inclination angle within a range of approximately θ2=44° to 56°. A cutter knife comprising: the cutter knife holder according to any one of claims 1 to 16; and a cutter blade slidably accommodated in the blade accommodating portion.

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