JP2021171912A - Clamping tool - Google Patents

Abstract

To provide a clamping tool with excellent convenience, which clamps a peripheral surface of a screw head portion and rotates a screw to remove the screw when it is difficult to remove a screwed screw by using a fastening tool due to crushing and the like of a cross hole, a hexagon hole, and a slot provided on the screw head portion.SOLUTION: A clamping portion 30 is provided at a front end of an arm 10 configuring a clamping tool A1, and a widening groove 50 extending from a front side toward a rear side of the clamping portion 30 so as to expand width is provided on an opposite surface 40 of the clamping portion. The widening groove 50 is a groove widening from a front side toward a rear side of the arm when a longitudinal direction of the arm is set to a fore-and-aft direction having a tip end side of the arm as a front side.SELECTED DRAWING: Figure 1

Description

According to the present invention, when it is difficult to remove a screwed screw with a fastening tool due to crushing of a cross hole, a hexagonal hole, a sliding surface, etc. provided on the screw head, the peripheral surface of the screw head The present invention relates to a holding tool that enables the screw to be removed by holding the screw and rotating the screw.

The applicant conceived the inventions described in Patent Documents 1 and 2 below, assuming that a holding tool such as pliers or pliers has a function of holding the peripheral surface of a screw that has been screwed and making it removable. ing.

For example, the holding tool described in Patent Document 1 is tilted so that the engaging surfaces (7) provided at the front ends of the holding portions of the pair of arms (1) connected by the shaft (2) are spread outward. When the head (16) of the screw (15) is sandwiched, the engaging surface (7) is configured to be substantially parallel, and the engaging surface (7) is near the seating surface of the screw head. By making it easier to grasp the outer peripheral surface, the phenomenon that the jaw portion (4) does not completely pinch the head (16) of the screw (15) and comes out upward is suppressed.

Further, in the holding tool described in Patent Document 2, vertical holding teeth (13) are formed on the facing surfaces of the holding portions (4) provided at the front ends of the first arm (1) and the second arm (2). The side surface shape of the striped tooth (13a) constituting the vertical sandwiching tooth (13) is recessed and curved with respect to the facing surface of the sandwiching portion (4).
With the above configuration, the vertical pinching tooth (13) does not interfere with the upper peripheral surface of the screw head (21), and the screw head is located near the tip of the pinching portion (4) of the vertical pinching tooth (13). The lower peripheral surface of (21) can be sandwiched, and as a result, the phenomenon that the sandwiching portion (4) does not completely sandwich the screw head (21) and slips out upward is suppressed.

Japanese Patent No. 3487676 Japanese Patent No. 4471315

An object of the present invention is to provide a holding tool that can be removed by securely holding the peripheral surface of a screw head with a holding portion and rotating the screw by a principle different from that of Patent Documents 1 and 2 described above.

The holding tool according to the present invention is a holding tool in which two arms are rotatably connected so that the holding portions provided at the tips of the two arms can be approached and separated from each other. When a widening groove is provided on the facing surface of at least one of the sandwiching portions facing the other sandwiching portion, and the longitudinal direction of the arm is the front-rear direction with the tip end side of the arm as the front side. The widening groove is configured to be a groove widened from the front side to the rear side of the arm.

With this configuration, when closing the holding portions of both arms in order to hold the screw head, the widening groove provided on the facing surface of the holding portion delays the contact between the facing surface and the screw head as much as possible. Therefore, the crossing angle between the facing surfaces can be narrowed as much as possible.
As a result, the portion of the facing surface close to the tip of the sandwiching portion is designated as the contact portion with the periphery of the seat surface of the screw head, and the peripheral surface (outermost outer peripheral surface) forming the maximum diameter of the screw head at this contact portion. ) Can be pinched in the vicinity.
Therefore, the component of the axial force of the screw acting on the screw head from the pinching portion can be minimized, and the action of the pinching portion not being able to pinch the screw head and coming out can be suppressed.
Further, by sandwiching the vicinity of the outermost peripheral surface around the seat surface of the screw head, the maximum distance from the screw center to the contact point can be secured, so that the rotational torque (moment) when the screw is turned and removed. Is larger, and the removal operation can be performed more easily.

Further, when the peripheral surface closer to the seating surface side than the outermost peripheral surface of the screw head is sandwiched by the sandwiching portion, a force for pulling the screw head is exerted on the sandwiching portion. This attractive force acts to offset the force that acts when the peripheral surface of the screw head is pinched by the pinching portion, and the screw head tries to come out from the pinching portion. As a result, when the screw head is being sandwiched, the action of the sandwiching portion not being able to pinch the screw head and coming out can be suppressed, and the screw head can be reliably sandwiched.

Further, in the present invention, when the widening groove is provided on the facing surfaces of the sandwiching portions of both arms, the effect of suppressing the screw head from coming off and the effect of facilitating the removal of the screw head can be obtained more remarkably. ..

Further, in the present invention, it is not essential to form the groove depth toward the grip portion side as in the conventional Patent Documents 1 and 2.
As a result, it is not necessary to deeply damage the facing surface, which leads to securing the tip strength of the sandwiching portion.
Further, since the widening groove does not easily affect the gripping function of the object, the gripping function required as a holding tool such as pliers, pliers, and tweezers can be maintained as much as possible.

Further, the holding tool according to the present invention can be configured by providing a plurality of the widening grooves on the facing surface.

With such a configuration, one pinching tool can handle pinching work of screws having a larger diameter.

Further, the holding tool according to the present invention can be configured by providing the widening groove with vertical teeth extending from the tip of the holding portion toward the grip portion side.

With such a configuration, not only the above-mentioned function of sandwiching the screw head at a portion of the facing surface near the tip of the sandwiching portion, but also the screw head with vertical teeth like the vertical sandwiching tooth in Patent Document 1 described above. It is possible to provide a function of pinching a screw, and one pinching tool can handle pinching work of screws having a larger diameter.

According to the present invention, it is possible to provide a holding tool capable of more reliably holding and removing a screw head.

The model figure of the holding tool which concerns on Example 1. FIG. Image of pinching the screw head by the pinching part. The schematic diagram which shows the structure of the widening part. An image of sandwiching when a monospaced groove is provided. An image of sandwiching when a widening groove is provided. The schematic diagram of the holding tool which concerns on modification 1. The schematic diagram of the holding tool which concerns on modification 2. The schematic diagram of the holding tool which concerns on modification 3. The schematic diagram of the holding tool which concerns on modification 4. The schematic diagram of the holding tool which concerns on modification 5. The schematic diagram of the holding tool which concerns on modification 6. The schematic diagram of the holding tool which concerns on Example 2.

Hereinafter, examples of the present invention will be described with reference to the drawings.
In the present invention, the holding tool refers to a manual tool such as pliers, pliers, tweezers, or a machine tool having a function of holding an object.

<1> Overall configuration (Fig. 1)
FIG. 1 shows a first embodiment of the holding tool according to the present invention.
In this embodiment, pliers A1 are assumed as the holding tool according to the present invention. The pliers A1 are configured by connecting two arms 10 rotatably in the middle of each arm 10 in the longitudinal direction.
A holding portion 30 is provided on one end side of each arm 10 in the longitudinal direction.
Further, a grip portion 20 is provided on the other end side of each arm 10 in the longitudinal direction.
In the present invention, each arm 10 is not limited to a type having a linear shape, but also includes a type in which the grip portion 20 is bent with respect to the holding portion 30.
That is, the shape of each arm 10 is not particularly limited, and a known shape adopted for a manual tool or a machine tool having a function of holding an object can be adopted.

<1.1> Holding part (Fig. 1)
The sandwiching portion 30 is provided on one end side of each arm 10 in the longitudinal direction and is a portion for sandwiching an object. The holding portion 30 is also called a grip portion or a jaw portion.
The width B of the sandwiching portion 30 is appropriately designed according to various uses such as the size of the space to which the screw head to be sandwiched is attached and the diameter range of the screw head to be sandwiched.

<1.2> Grip (Fig. 1)
The grip portion 20 is provided on the other end side of each arm 10 in the longitudinal direction and is a portion for the user to grip. The grip portion 20 is also called a handle or a handle.
The user can grip, bend, cut, or the like by grasping both the gripping portions 20 and operating the sandwiching portions 30 so as to approach each other.
The shape of the grip portion 20 can be appropriately designed.

<2> Facing surfaces (Figs. 1 and 2)
The holding portion 30 provided on the arm 10 is provided with a facing surface 40 on the side facing the holding portion 30 of the other arm 10.

<2.1> Crossing angle between facing surfaces (Fig. 1)
The crossing angle θ1 between the facing surfaces 40 of each arm changes depending on the size of the object when the object is sandwiched by the sandwiching portion 30.
More specifically, the crossing angle θ1 becomes large when holding a large object and becomes small when holding a small object.

<2.2> Surface shape of facing surface (Fig. 1)
In the present invention, the surface shape of the facing surface 40 may be a flat shape or a non-flat shape, and is not particularly limited.
In the holding tool according to the present invention, lateral teeth having a mountain shape may be continuously formed in the front-rear direction on the facing surface 40 of the holding portion 30 so as to facilitate holding an object.
In addition, in order to facilitate the description of the present invention, the lateral teeth are not shown in FIG. 1, and the surface of the facing surface 40 is made flat.

<3> Widening groove (Figs. 1 to 3)
The facing surface 40 is provided with a widening groove 50 that is recessed from the surface of the facing surface 40.
In FIG. 1, when the longitudinal direction of the arm 10 is the front-rear direction, the side provided with the holding portion 30 is defined as the front side, and the side provided with the grip portion 20 is defined as the rear side.
Further, in the arm 10, the direction of the holding portion 30 on the width B side is defined as the groove width direction of the widening groove 50.
Based on the above definition, the widening groove 50 shown in FIG. 1 has a predetermined groove depth length D from the facing surface 40, and has a groove width length on the holding portion 30 side from the front side to the rear side. The width is widened from the initial width length W1 to the groove width length (final width length) W2 on the grip portion 20 side.

The "groove depth length D" is assumed to be 1.2 mm or more (D ≧ 1.2 mm) when the head diameter of the screw to be pinched is 3 mm to 9.5 mm.

The above-mentioned "initial width length W1" is assumed to be 2.95 mm or less (W1 ≦ 2.95 mm) when the head diameter of the screw to be pinched is 3 mm to 9.5 mm.

<3.1> Holding image (Fig. 2)
FIG. 2 shows a simplified image of a screw head being pinched by a pinching portion provided with a widened portion.
When the operation of closing the space between the two holding portions 30 is performed from both sides of the screw head 90, the outermost peripheral surface around the seat surface of the screw head 90 is moved to a portion of the facing surface 40 near the tip portion 31 of the holding portion 30. Can be pinched.

<3.1.1> Contact point of the screw head in the pinched state (Fig. 2)
The above-mentioned "near the outermost peripheral surface" means the peripheral surface (outermost outer peripheral surface) constituting the maximum diameter of the head of the screw to be pinched and the periphery thereof. For example, when the head diameter of the screw is 3.5 mm to 9 mm, the peripheral surface from the outermost peripheral surface of the head of the screw to be pinched to the top surface side of the screw head is about 0.5 mm, and the maximum. The peripheral surface from the outer peripheral surface to the seating surface of the screw head is included.

<3.2> Bottom shape of widening groove (Fig. 3 (a))
In the present invention, the shape of the bottom surface 51 of the widening groove 50 is not particularly limited.
In FIG. 3A, the bottom surface 51 forming the widening groove 50 is formed of a flat surface having a surface parallel to the facing surface 40.

<3.3> Widening angle of widening groove (Fig. 3 (b))
In the present invention, the widening angle θ2 of the widening groove 50 seen from the facing surface 40 side is not particularly limited.
However, the widening angle to which the groove width slightly widens from the front side to the rear side does not correspond to the widening angle θ2 referred to in the present invention. For example, when machining a groove recessed so as to be recessed on the facing surface, a slightly widening angle may be provided for the purpose of facilitating the jig from coming out, or the widening angle may be slightly widened as a result due to the influence of machining accuracy. If it occurs, it does not correspond to the widening angle θ2 referred to in the present invention.
In the present invention, it is desirable that the widening angle θ2 of the widening groove 50 is at least 10 ° or more.
The influence of the size of the widening angle θ2 of the widening groove 50 will be described below.

<3.3.1> When the widening angle is increased (Fig. 3 (b))
When the widening angle θ2 of the widening groove 50 becomes large, the defective portion of the facing surface 40 increases, which may lead to a reduction in the area of the portion used for the gripping function of the object, which is originally expected as pliers or pliers.
Therefore, from the viewpoint of ensuring the gripping function as pliers or pliers, it is desirable not to make the widening angle θ2 too large.

<3.3.2> When the widening angle is reduced (Fig. 3 (b))
When the widening angle θ2 of the widening groove 50 becomes small, when the screw head 90 is to be sandwiched, the portion of the facing surface 40 closer to the grip portion 20 side than the portion closer to the tip portion 31 of the sandwiching portion 30 precedes. It becomes easy to come into contact with the peripheral surface of the screw head 90, and the screw head 90 may not be able to be sandwiched at a portion of the facing surface 40 near the tip 31 of the sandwiching portion 30.
Therefore, from the viewpoint of avoiding that the portion of the facing surface 40 that is separated from the tip portion 31 of the holding portion 30, that is, the portion that is close to the grip portion 20 side, interferes with the screw head 90 in advance, the widening angle θ2 is set. It is desirable to make it larger.

<3.4> Planar shape of widening groove (Fig. 3 (b))
In the present invention, the planar shape of the widening groove 50 seen from the facing surface 40 side of the holding portion 30 is not particularly limited as long as it has the widening angle θ2 described above.
That is, the edge portion 53 that is the boundary between the facing surface 40 and the widening groove 50 is not limited to a straight line, but may have a curved shape, a stepped shape, or the like.
FIG. 3B shows an example of the planar shape of the widening groove. In this example, the edge portion 53 is diverged from the sandwiching portion 30 toward the grip portion 20 side, and toward the thickness direction of the sandwiching portion 30. A symmetrical inverted trapezoidal widening groove 50 is formed.

<3.5> Front shape of widening groove (Fig. 3 (c))
In the present invention, various shapes can be selected as the front shape of the widening groove 50 as viewed from the tip end 31 side of the holding portion 30.
Further, in the present invention, the cross-sectional shape of the widening groove 50 appropriately cut from the holding portion 30 toward the grip portion 20 does not have to be the same shape.
FIG. 3C shows an example of the front shape of the widening groove 50 when the sandwiching portion 30 is viewed from the tip end portion 31 side.
The widening groove 50 is composed of a bottom surface 51 forming a step with the facing surface 40 and side surfaces 52 connecting the facing surfaces 40 on both sides of the bottom surface 51, and as a result, the widening groove 50 is formed. The front shape of 50 is substantially rectangular.
Further, the angle (corner angle) θ3 of the internal angle of the corner portion composed of the facing surface 40 and the side surface 52 is a right angle.

<3.6> Widening groove processing method As a method of providing the widening groove 50 on the facing surface 40, various processing methods such as cutting, pressing, metal powder injection molding, and precision casting can be used.

<4> Functions and actions during use (Fig. 4A, Fig. 4B)
The functions and operations when the head of the screwed screw is pinched by the pinching tool according to the present invention will be described with reference to FIGS. 4A and 4B.
FIG. 4A shows a configuration in which a groove of equal width (equal width groove) is provided on the facing surface as a pinching tool outside the scope of the present invention for comparison, and FIG. 4B shows a pinching tool according to the present invention. As a tool, a configuration in which a widening groove 50 is provided on a facing surface is shown.
In each of the figures, (a) shows a schematic view of the sandwiched portion viewed from the side surface side, and (b) shows a schematic view of the sandwiched portion viewed from the opposite surface side.

<4.1> In the case of a monospaced groove (Fig. 4A)
In the case of the equal width groove a shown in FIG. 4A, when the holding portion c is closed, the facing surface d is separated upward from the periphery of the seat surface of the screw head e before the facing surface d comes into contact with the periphery of the seat surface of the screw head e. Since the facing surface d comes into contact with the peripheral surface of the screw head e at the point where the screw head is formed, it is not possible to fully grasp the vicinity of the outermost peripheral surface around the seat surface of the screw head, and the intersection angle θ1 of the holding portion c is θ1-1. (Fig. 4A (a)).
Then, the portion of the facing surface d that is located below the contact portion b and is close to the tip portion 31 of the holding portion 30 does not come into contact with the screw head e (FIG. 4A (b)).

<4.2> In the case of widening groove (Fig. 4B)
On the other hand, in the case of the widening groove shown in FIG. 4B, even if the sandwiching portions 30 are closed, the portion corresponding to the contact portion b shown in FIG. 4A is missing due to the presence of the widening groove 50, and the screw head No contact with the peripheral surface of 90 occurs.
Therefore, in the configuration shown in FIG. 4B (a), the intersection angle θ1 can be made narrower (θ1-2 <θ1-1) than in the configuration shown in FIG. 4A (a), and the facing surface 40 Of these, the portion of the holding portion 30 near the tip portion 31 can be brought into contact with the vicinity of the outermost outer peripheral surface around the seat surface of the screw head 90.
Further, as shown in FIG. 4B (b), the edge portion 53, which is the boundary between the widening groove 50 and the facing surface 40, is in a state of being inclined with respect to the vertical direction of the paper surface.
Therefore, when the peripheral surface near the outermost peripheral surface around the seat surface of the screw head 90 is sandwiched between the peripheral surfaces closer to the fastening surface side than the outermost peripheral surface, the screw is screwed at the contact point between the edge 53 and the screw head 90. A force that tries to pull the head 90 toward the holding portion acts. This attractive force acts to cancel the force that the screw head 90 tries to come out from the holding portion 30, which acts when the peripheral surface of the screw head 90 is sandwiched by the holding portion 30.
As a result, when the screw head 90 is being sandwiched, the action of the sandwiching portion 30 not being able to completely pinch the screw head 90 and coming out is suppressed, and the screw head 90 can be reliably sandwiched.

<4.3> Comparative example of contact points 1 (pan screw) (Table 1)
In the present invention, the screw to be pinched is assumed to be an M5 pan head screw according to the standard of "JIS B 1111", and the groove width length (initial width length) of the widening groove 50 on the tip end 31 side on the facing surface 40 is fixed. In Examples 1 to 6 when the widening angle θ2 is changed from 0 ° to 60 ° by 10 °, a groove of equal width (equal width groove a) is provided on the facing surface 40, which is not included in the scope of the present invention. Contact points 60 between the facing surface 40 located at the edge 53 and the peripheral surface of the screw head 90 for each of Comparative Examples 1 to 3 (width groove lengths of equal width grooves: 2 mm, 4 mm, 6 mm) in the case of being provided. Table 1 showing the separation distance (contact width) between the screws and the height (seat surface height) of the screw at the contact point from the seat surface is shown below.

As shown in Examples 1 to 6 of Table 1, it was found that as the widening angle θ2 was increased, the contact width became wider and the seating surface height became lower.
Further, as shown in Comparative Examples 1 to 3, the monospaced groove a has a seating surface height that becomes lower as the groove width length is increased, but reaches a seating surface height equivalent to that of Examples 3 to 6. It never reached.
That is, in the case of the equal width groove a, the width groove length and the contact width are equal in length, whereas in the case of the widening groove 50, the contact width is larger than the initial width length, so that the same seat height is achieved. It is possible to reduce the width groove length.
Therefore, as compared with the monospaced groove a, the aspect of the widening groove 50 can make the seating surface height of the contact portion 60 lower and the intersection angle θ1 between the facing surfaces 40 as narrow as possible, and can be sandwiched. The defective portion on the facing surface of the portion can be reduced.

<4.4> Comparative example of contact points 2 (truss screw) (Table 2)
In the present invention, the screw to be pinched is assumed to be an M5 truss screw according to the standard of "JIS B 1111", the initial width length of the widening groove 50 is fixed, and the widening angle θ2 is set by 10 ° from 0 ° to 60 °. Examples 7 to 12 when changed, and Comparative Examples 4 to 6 (equal width groove) in the case where a groove of equal width (equal width groove a) is provided on the facing surface 40, which is not included in the scope of the present invention. For each of the width groove lengths (2 mm, 4 mm, 6 mm), the separation distance (contact width) between the contact portion 60 between the facing surface 40 located at the edge 53 and the peripheral surface of the screw head 90, and the screw at the contact portion. Table 2 showing the height from the seat surface (seat surface height) is shown below.

As shown in Examples 7 to 12 of Table 1, it was found that as the widening angle θ2 was increased, the contact width became wider and the seating surface height became lower.
Further, as shown in Comparative Examples 4 to 6, the seating surface height decreases as the groove width length of the monospaced groove a becomes wider, but the seating surface height reaches the same level as in Examples 9 to 12. It never happened.
That is, in the case of the equal width groove a, the width groove length and the contact width are equal in length, whereas in the case of the widening groove 50, the contact width is larger than the initial width length, so that the same seat height is achieved. It is possible to reduce the groove width length.
Therefore, as compared with the monospaced groove a, the aspect of the widening groove 50 can make the seating surface height of the contact portion 60 lower and the intersection angle θ1 between the facing surfaces 40 as narrow as possible, and can be sandwiched. The defective portion on the facing surface of the portion can be reduced.

<5> Summary As described above, in the holding tool according to the present invention, the screw head 90 is held in a state where the crossing angle θ1 between the facing surfaces 40 is narrowed by providing the widening groove 50 on the facing surface 40. can do.
Further, the outermost peripheral surface around the seat surface of the screw head 90 can be sandwiched at a portion of the facing surface 40 near the tip end portion 31 of the sandwiching portion 30.
As a result, the action of the pinching portion 30 coming out of the screw head 90 can be reduced, and the screw can be firmly pinched.
Further, by sandwiching the vicinity of the outermost outer peripheral surface around the seat surface of the screw head 90, the maximum distance from the screw center to the contact point can be secured, so that the screw head 90 is rotated in the screw axis direction. The rotational torque (moment) at the time of removal can be increased, and the removal operation can be performed more easily.

Further, since the crossing angle θ1 of the sandwiching portion 30 becomes larger when a large screw is sandwiched, the sandwiching portion 30 is more easily pulled out from the screw head 90. As described above, in the holding tool according to the present invention, by providing the widening groove 50 on the facing surface 40, the screw head 90 can be held in a state where the intersection angle θ1 between the facing surfaces 40 is narrower.
Therefore, the holding tool according to the present invention is also suitable for holding a screw having a large diameter.

Further, the widening groove 50 has a depth within a range in which the outermost peripheral surface around the seating surface of the screw head 90 can be sandwiched at a portion of the facing surface 40 close to the tip portion 31 of the sandwiching portion 30, so that the conventional method is used. It is not essential to form the groove depth toward the grip portion side as in the technique, and the thin portion of the sandwiching portion 30 is not locally formed.
Therefore, the holding tool according to the present invention can secure the tip strength of the holding portion 30.

Further, since the widening groove 50 sandwiches the vicinity of the outermost outer peripheral surface around the seat surface of the screw head 90, it is not necessary to secure a large width groove length as in the conventional monospaced groove, so that the sandwiching portions face each other. The defective portion on the surface can be reduced.
Therefore, since the widening groove 50 does not easily affect the gripping function of the object, the function required as pliers or pliers can be maintained as much as possible.

<6> Deformation example 1 (Shape of widening groove (Fig. 5))
In the present invention, various shapes can be adopted as the shape of the widening groove 50 when appropriately cut from the tip portion 31 side toward the grip portion 20 side and viewed from the end face.
This will be described below with reference to the end view of the sandwiched portion 30 as viewed from the tip portion 31 side shown in FIG.

<6.1> Trapezoidal type (Fig. 5 (a))
The corner angle θ3 between the facing surface 40 and the side surface 52 can be set to less than 90 degrees, and the cross-sectional shape of the widening groove 50 can be trapezoidal.
In this modification, the volume of the widening groove 50 is slightly increased as compared with the above-mentioned basic configuration, but the function of firmly holding the screw is not affected.

<6.2> Inverted trapezoidal type (Fig. 5 (b))
The corner angle θ3 between the facing surface 40 and the side surface 52 can be made larger than 90 degrees, and the shape of the widening groove 50 can be made into an inverted trapezoidal shape.
In this modification, the volume of the widening groove 50 can be reduced as compared with the above-mentioned basic configuration, which contributes to maintaining the strength of the sandwiching portion 30.
Further, by making the corner angle θ3 an obtuse angle, it also contributes to the prevention of the corner defect.

<7> Deformation example 2 (bottom surface aspect of widening groove (FIG. 6))
Further, in the present invention, the following shapes can be adopted as the shape of the bottom surface 51.

<7.1> Arc type (Fig. 6 (a))
In the schematic cross-sectional view seen from the side surface side of the sandwiching portion 30 shown in FIG. 6A, an arc surface 511 is formed behind the bottom surface 51 of the widening groove 50.
The arc surface 511 is a curved surface that is inevitably formed along the arc of the cutter when the cutter cutting is used for machining the widening groove 50.
Even in this modified example, there is no change in the function of firmly holding the screw as compared with the above-mentioned basic configuration.

<7.2> Slope type (Fig. 6 (b))
In the schematic cross-sectional view of the sandwiching portion 30 seen from the side surface side shown in FIG. 6B, the depth of the bottom surface 51 of the widening groove 50 from the front side to the rear side of the sandwiching portion 30 with the facing surface 40. A slope is formed by gradually reducing.
Even in this modified example, there is no change in the function of firmly holding the screw as compared with the above-mentioned basic configuration.

<7.3> Curved type (Fig. 6 (c))
In the schematic perspective view of the sandwiching portion 30 shown in FIG. 6C, the bottom surface 51 of the widening groove 50 is configured to be curved with respect to the width direction of the sandwiching portion 30.
Even in this modification, if the corner angle θ3 is maintained at a constant angle, the function of firmly holding the screw is not affected as compared with the above-mentioned basic configuration.

<7.4> Vertical tooth type (Fig. 6 (d))
In the schematic perspective view of the sandwiching portion 30 shown in FIG. 6D, vertical teeth 54 having a mountain-shaped groove are continuously formed on the bottom surface 51 of the widening groove 50 in the width direction of the widening groove 50. There is.
The top of the vertical tooth 54 is positioned so as to gradually separate from the facing surface 40 from the holding portion 30 toward the grip portion 20 side.
In this modification as well, the function of firmly holding the screw is the same as that of the above-mentioned basic configuration, and further, the vertical tooth 54 has the above-mentioned patent for a screw having a diameter smaller than the tip width of the widening groove 50. Since it functions like the vertical pinching tooth according to Document 2 (Patent No. 4471315), it is possible to obtain a function of reliably pinching the screw head.

<8> Deformation example 3 [Integration with the recessed portion] (Fig. 7)
In the present invention, the facing surface 40 may be provided with a recessed portion other than the widening groove 50.
In FIG. 7, a substantially circular recess portion formed so as to be recessed from the facing surface 40 is provided, and a part of the recess portion in which the groove width is widened from the holding portion 30 side to the grip portion 20 side. The region is a widening groove 50.
Even in this modified example, there is no effect on the function of firmly holding the screw as compared with the above-mentioned basic configuration.

<9> Modification 4 [Number of widening grooves] (Fig. 8)
In the present invention, a plurality of widening grooves 50 may be provided on the facing surface 40.
As shown in FIG. 8, the bottom surface of the widening groove 50 (first widening groove 50a) recessed from the facing surface 40 is regarded as another facing surface, and the widening groove 50 is smaller than the first widening groove 50a. (Second widening groove 50b) may be formed.

According to this modification, for a screw having a head diameter smaller than the tip width length of the first widening groove 50a, the second widening groove 50b is provided with a holding function to obtain a corresponding screw diameter. A wide holding tool can be provided.

<10> Modification 5 [Structure in which V-grooves are provided in multiple stages] (FIG. 9)
In the present invention, a widening groove 50 may be formed by providing one or more V-shaped grooves (hereinafter, also referred to as “V grooves”) on the facing surface 40.
In FIG. 9, two V-grooves having different depths and widths are formed on the facing surface 40 of the holding portion 30.
These two V-grooves are shallower than the inner V-groove so as to first cut the inner two-sided grooves to form the inner V-groove and contact both outer sides of the inner V-groove. The V-groove is cut to form the outer V-groove.
At this time, the open region divided in the inverted trapezoidal shape included in the inner V-groove described above corresponds to the widening groove (inside) corresponding to the screw belonging to the group having a small head diameter among the screws to be pinched. Widening groove 50c).
Further, the widening groove (outer widening) in which the open region divided in the inverted trapezoidal shape included in the outer V-groove corresponds to the screw belonging to the group having a large head diameter among the screws to be pinched. The groove is 50d).

According to this modification, it is possible to provide a holding tool having a wide corresponding screw diameter with two widening grooves (inner widening groove 50c and outer widening groove 50d) having different depths and widening widths. In addition, the gripping function originally required for pliers and pliers is improved as compared with the case of trapezoidal shape.

<11> Modification 6 [Structure in which the boundary of the curved groove is a vertical tooth] (FIG. 10)
In the present invention, the widening groove 50 can also be formed by providing a plurality of narrow grooves in the facing surface 40 side by side in the thickness direction of the sandwiching portion.
In FIG. 10, a plurality of narrow curved grooves 55 having a curved surface in cross section are arranged side by side on the facing surface 40 to form a widening groove 50.
At this time, the boundary portion of the adjacent curved groove 55 also functions as the vertical tooth 54 described in <7.4> of the above-mentioned modification 2.

<12> Modification 7 [Symmetry with the other sandwiching portion] (not shown)
Further, in the present invention, the widening groove 50 provided on the facing surface 40 of each arm 10 is not limited to the point of forming the same shape.
For example, the widening angle θ2 of the widening groove 50 provided in one holding portion 30 may be formed larger than the widening angle θ2 of the widening groove 50 provided in the other holding portion 30.
Further, the widening groove 50 may be provided only in one holding portion 30, and the widening groove 50 may not be provided in the other holding portion 30.

The holding tool according to the present invention can also be applied to tweezers.
There are two types of tweezers, one is a folded type that is constructed by folding a single long member, and the other is a combined type that is configured by fixing the rear ends of two independent long members, and the arm can be rotated. It has a structure that connects to.
FIG. 11 is a model diagram of the holding tool according to the second embodiment.
The tweezers A2 shown in FIG. 11 is composed of two arms 10 in which both sandwiching portions 30 are configured to be close to each other by connecting long members provided with sandwiching portions 30 at both ends.
In the case of tweezers, the grip portion 20 is at a position slightly moved rearward from the holding portion 30.

Also in the holding tool according to the present embodiment, the screw head is in a state where the crossing angle θ1 between the facing surfaces 40 is narrowed by the widening groove 50 provided on the facing surface 40 of the holding portion 30 provided at the tip of each arm 10. 90 can be sandwiched.
As a result, the vicinity of the outermost peripheral surface around the seat surface of the screw head 90 can be sandwiched at a portion of the facing surface 40 near the tip end portion 31 of the sandwiching portion 30.
As a result, the action of the holding portion 30 coming out of the screw head 90 can be reduced, the screw can be held firmly, and further, the rotational torque (rotational torque) when the screw head 90 is rotated in the screw axial direction and removed. Since the moment) can be increased, the screw can be removed more easily.

A1: Pliers A2: Tweezers 10: Arm 20: Gripping part 30: Holding part 40: Facing surface 50: Widening groove 51: Side surface 52: Bottom surface 53: Edge part 54: Vertical tooth 55: Curved groove 50a: First widening groove 50b: Second widening groove 50c: Inner widening groove 50d: Outer widening groove 60: Contact point θ1: Crossing angle θ2: Widening angle θ3: Corner angle 90: Screw head B: Tweezers width length D: Groove depth Length W1: Initial width Length W2: Final width length H: Height a: Equal width groove b: Contact point c: Holding part d: Facing surface e: Screw head

Claims (3)

A holding tool in which two arms are rotatably connected so that the holding portions provided at the tips of the two arms can be approached and separated from each other.
In at least one of the sandwiched portions, a widening groove is provided on the facing surface facing the other sandwiched portion.
When the longitudinal direction of the arm is the front-rear direction with the tip end side of the arm as the front side, the widening groove is a groove widened from the front side to the rear side of the arm.
Holding tool. A plurality of the widening grooves are provided on the facing surface.
The holding tool according to claim 1. The widening groove is provided with vertical teeth extending from the front side to the rear side of the arm.
The holding tool according to claim 1 or 2.

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