JP3219964U - Pliers - Google Patents

Abstract

There is provided a plier that can securely clamp and remove a screw head even if the screw head is rusted and has a different outer diameter.
A pair of arms (11, 11) having jaw portions (13, 13) on the front end side and handle portions (14, 14) on the rear end side are rotatable via a connecting shaft (12). It is connected and the object is sandwiched between the jaws 13 and 13. The pliers 10 are formed in the front region of the jaws 13 and 13 into a trapezoidal recess that is outwardly spread when viewed from the tip side by a plurality of tooth tips, and along the front-rear direction of the bottom surface and the side surfaces of the recess. Thus, a plurality of vertical pinching teeth 15 are formed.
[Selection] Figure 1

Description

  The present invention relates to a plier in which a jaw part and a handle part are connected via a connecting shaft.

  Conventionally, this type of pliers has a technique described in Patent Document 1, for example. This technique has a jaw portion composed of a left jaw portion and a right jaw portion provided to face each other. A plurality of vertical pinching teeth are provided in the front part of the contact surface between the left jaw part and the right jaw part of the jaw part. The tips of these vertical pinching teeth are arranged on the same circular arc surface. Specifically, the upper base of the tip of the vertical pinch teeth is arranged on the same circular curved surface.

JP 2017-19093 A

  In the technique described in Patent Document 1 as described above, since the tips of the vertical pinching teeth are arranged on the same arc surface, the curvature of the arc surface and the head of a small screw (hereinafter simply referred to as a screw). If the curvatures of the outer diameters are substantially the same, the contact area is increased, and the force of clamping between the tips of the vertical pinching teeth is increased.

  However, in the technique described in Patent Document 1, when the curvature of the outer diameter of the screw head is large or small with respect to the curvature of the arcuate surface of the vertical pinch tooth, the tip of the vertical pinch tooth and the screw head Since the contact area with which the outer peripheral surface comes into contact is reduced, the force of clamping with the tip of the vertical pinch teeth becomes extremely weak. As a result, there is a problem that the screw head cannot be securely clamped and removed from the fastening target. In particular, in the case of a screw in which the screw shaft is rusted or the operation groove provided on the screw head is deformed and crushed, the above problem becomes more remarkable.

  The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a plier that can securely nip and remove a screw head even if the screw head is rusted and has a different outer diameter. .

  In order to solve the above-mentioned problems, the invention described in claim 1 is such that a pair of arms each having a jaw portion on the front end side and a handle portion on the rear end side are rotatably connected via a connecting shaft. A pliers for sandwiching an object between the jaws, and formed in a trapezoidal recess extending outwardly as viewed from the distal end side by a plurality of tooth tips in a front region of each jaw. A plurality of vertical pinching teeth are formed along the front-rear direction of each bottom surface portion and each side surface portion.

  Further, the invention described in claim 2 is characterized in that, in addition to the configuration described in claim 1, the plurality of vertical pinching teeth are formed at the same pitch and height.

  In addition to the configuration according to claim 1 or 2, the invention described in claim 3 is that the plurality of vertical pinching teeth are set to have a pitch of 1.50 mm and a height of 0.80 mm. Features.

  According to the first aspect of the present invention, a plurality of tooth tips are formed in the front region of each jaw portion to form a trapezoidal concave portion that spreads outward as viewed from the distal end side, and each bottom surface portion and each side surface portion of the concave portion is Since a plurality of vertical pinching teeth are formed along the front-rear direction, even if it is a screw head that rusts and has a different outer diameter, the contact area between the vertical pinching tooth tip and the screw head increases, The screw head can be securely held and removed.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the plurality of vertical pinching teeth are formed with the same pitch and height, the teeth of the vertical pinching teeth Since the contact area where the tip and the screw head come into contact with each other is increased, the screw head can be more securely clamped and removed.

  According to the invention described in claim 3, in addition to the effects of the invention described in claim 1 or 2, the plurality of vertical pinching teeth are set to have a pitch of 1.50 mm and a height of 0.80 mm. As a result, the contact area where the tip of the vertically pinched teeth and the screw head come into contact with each other is further increased, so that the screw head can be more securely clamped and removed.

It is a perspective view which shows the state which opened the jaw part in the pliers which concern on this Embodiment. It is a perspective view which shows the state which closed the jaw part in the pliers which concern on this Embodiment. It is a longitudinal cross-sectional view of FIG. It is a front view which shows the state which closed the jaw part which looked at the pliers of FIG. 2 from the front end side. It is an expanded sectional view which shows the jaw part of FIG. It is a perspective view which shows the state which clamped the screw head with the jaw part in the pliers which concern on this Embodiment. It is an expanded sectional view which shows the state which clamped the screw head of diameter D1 with the jaw part of FIG. It is an expanded sectional view which shows the state which clamped the screw head of diameter D2 with the jaw part of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a configuration of a plier according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which the jaws are closed in the pliers according to the present embodiment. FIG. 3 is a longitudinal sectional view of FIG. FIG. 4 is a front view showing a state in which the jaw portion when the pliers of FIG. 2 are viewed from the distal end side is closed. FIG. 5 is an enlarged cross-sectional view showing the jaw part of FIG. 4.

  In the pliers of the present embodiment, the side where the jaw portion is provided in the pair of arms will be described as the front end side, and the side where the handle portion is provided will be described as the rear end side.

  As shown in FIGS. 1 to 3, the pliers 10 of the present embodiment have a pair of arms 11 and 11 that are rotatably connected via a connecting shaft 12. The pair of arms 11 and 11 have jaw portions 13 and 13 on the front end side, and handle portions 14 and 14 on the rear end side, respectively.

  On the opposing surfaces of the jaws 13 and 13, vertical pinching teeth 15 and 15, horizontal pinching teeth 16 and 16, and cutting blades 17 and 17 are sequentially formed from the distal end side to the connecting shaft 12. That is, on the opposing surfaces of the jaws 13 and 13, the vertical pinching teeth 15 and 15 are arranged in the front region, the horizontal pinching teeth 16 and 16 are arranged in the intermediate region, and the cutting blades 17 and 17 in the rear region. Is arranged. As described above, the vertical pinching teeth 15 and 15, the horizontal pinching teeth 16 and 16, and the cutting blades 17 and 17 are continuously formed on the opposing surfaces of the jaw portions 13 and 13.

  As shown in FIG. 1, the vertical pinching teeth 15, 15 have a plurality of teeth formed in a straight line in the front region from the distal end side of each jaw portion 13, 13 to the horizontal pinching teeth 16, 16 along its length direction. Has been. As shown in FIGS. 4 and 5, the plurality of tooth tips of the vertical pinching teeth 15, 15 are respectively formed in trapezoidal concave portions 18, 18 that are outwardly spread when viewed from the front end side. That is, the vertical pinching teeth 15 and 15 are distributed so that the tooth tips have a trapezoidal shape with the teeth extending outward when viewed from the tip side, and the upper bases of the tooth tips are formed on the same trapezoidal surface. The vertical pinching teeth 15 and 15 can pinch the outer peripheral surface of a screw head described later in a state orthogonal to the screw fastening surface.

  As shown in FIG. 5, the recesses 18 and 18 include flat bottom surface portions 18 a and 18 a, and side surface portions 18 b and 18 b, side surface portions 18 b and 18 b that are formed on both sides of the bottom surface portions 18 a and 18 a so as to spread outward. 18b. The side surface portions 18b and 18b and the side surface portions 18b and 18b are inclined at gentle angles with respect to the bottom surface portions 18a and 18a, respectively.

  The bottom surface portions 18a, 18a, the side surface portions 18b, 18b, and the side surface portions 18b, 18b are formed with a large number of fine teeth continuously in a mountain-like shape in the left-right direction as viewed from the front end side. These fine teeth are densely formed at the same pitch. Specifically, the pitch between teeth is 1.50 mm, and the height of the teeth is set to 0.80 mm.

  The horizontal pinching teeth 16 and 16 are provided between the vertical pinching teeth 15 and 15 and the cutting blades 17 and 17 in a direction perpendicular to the vertical pinching teeth 15 and 15. That is, the side pinching teeth 16 and 16 are arranged in a direction orthogonal to the length direction of the jaws 13 and 13. The lateral pinching teeth 16 and 16 are distributed such that the tooth tips are arcuate grooves.

  As shown in FIG. 3, the cutting blades 17 and 17 are a pair of opposed blades, and semicircular small-diameter peel holes 17 a and 17 a are formed at the same position facing each other. The small-diameter peel holes 17a and 17a are used for sandwiching a small-diameter insulated wire and stripping the covering portion.

  A large-diameter peeled portion 20 is provided in the vicinity of the connecting shaft 12 on the handle portions 14 and 14 side of the pair of arms 11 and 11. The large-diameter peeled portion 20 is used to peel off the covering portion of the insulated wire having a larger diameter than the insulated wire peeled off by the small-diameter peeled holes 17a and 17a. The large-diameter peeled portion 20 has a convex portion 21 formed in a semicircular shape on one arm 11, and a concave portion 22 formed in an arc shape on the other arm 11 facing the convex portion 21. ing.

  Therefore, the large-diameter peeled part 20 can sandwich the large-diameter insulated wire between the convex part 21 and the concave part 22 and peel off the covering part. The handle portions 14 and 14 are covered with synthetic resin covers 14a and 14a, respectively.

  Next, the operation of the pliers of this embodiment will be described.

  FIG. 6 is a perspective view showing a state in which the screw head is sandwiched between the jaws in the pliers according to the present embodiment. FIG. 7 is an enlarged cross-sectional view showing a state where a screw head having a diameter D1 is held between the jaws of FIG. FIG. 8 is an enlarged cross-sectional view showing a state where a screw head having a diameter D2 is held between the jaws of FIG.

  When the handle portions 14 and 14 of both arms 11 and 11 of the pliers 10 are gripped, the opening intervals of the jaw portions 13 and 13 become narrower as shown in FIGS. When there is no object between the jaws 13 and 13, the jaws 13 and 13 are closed when both sides of the longitudinal pinches 15 and 15 at the distal end of the jaws 13 and 13 come into contact with each other. Become. This state is a state in which the handle portions 14 and 14 have reached the grip limit. In this closed state, as shown in FIG. 3, the cutting edges 17 and 17 come into contact with each other, and the convex portion 21 of one arm 11 enters the concave portion 22 of the other arm 11 leaving a gap.

  6 and 7, when the jaws 13 and 13 are opened and the screw head 31 of D1 is clamped by the diameter (outer diameter) of the screw 30 as an object, the concave portions of the longitudinal pinches 15 and 15 are formed. Most of the teeth except for the bottom face portions 18a and 18a, the side face portions 18b and 18b, and some of the teeth on the side face portions 18b and 18b carry the screw head 31, and the tips of the teeth of the vertical pinching teeth 15 and 15 are screwed. It bites into the outer peripheral surface of the head 31.

  Therefore, in the present embodiment, the contact area between the tooth tips of the vertical pinching teeth 15 and 15 and the screw head 31 is increased, so that the force of pinching with the tooth tips of the vertical pinching teeth 15 and 15 becomes extremely strong. As a result, the rotational operation force of the pliers 10 can be accurately transmitted to the screw head 31.

  Next, the case where the screw 30 having the screw head 31 having the diameter D2 (D1 <D2) larger than the diameter D1 is removed will be described with reference to FIG.

  As shown in FIG. 8, when the jaws 13 and 13 are opened and a screw head 31 having a diameter D2 of the screw 30 is sandwiched, the bottom surface portions 18a and 18a of the longitudinal pinches 15 and 15 and the side surfaces 18b and 18b, Almost all the teeth of the side surfaces 18b and 18b hold the screw head 31 and the tips of the teeth of the vertical pinching teeth 15 and 15 bite into the outer peripheral surface of the screw head 31.

  In the present embodiment, even if the screw head 31 has a large diameter D2, the contact area between the tip of the vertical pinching teeth 15 and 15 and the screw head 31 is further increased. The force pinched by the tooth tip becomes extremely strong. As a result, the rotational operation force of the pliers 10 can be more accurately transmitted to the screw head 31.

  Here, the pliers 10 of the present embodiment are compared with general pliers. In general pliers, for example, a plurality of tooth tips of vertical pinching teeth are arranged on an arc surface. On the other hand, the pliers 10 of the present embodiment are formed in the trapezoidal recesses 18 and 18 that are spread outward by the plurality of tooth tips of the vertical pinching teeth 15 and 15 as described above.

  Therefore, when both teeth are formed with the same pitch and the same height, in the pliers in which the tooth tips are arranged on the circular arc surface, the outer diameter of the screw head 31 changes, so that the teeth to be bitten by the vertical pinching teeth The number increases or decreases extremely. On the other hand, in the pliers 10 of the present embodiment formed in the trapezoidal recesses 18 and 18 that are spread outwardly, even if the outer diameter of the screw head 31 changes, the number of teeth to be bitten by the vertical pinching teeth 15 and 15 It can now be securely clamped without much increase or decrease.

  Therefore, according to the pliers 10 of the present embodiment, not only the screw 30 having the small diameter of the screw head 31 but also the screw 30 having the large diameter, the vertical pinching teeth 15 and 15 are connected to the outer peripheral surface of the screw head 31. The screw head 31 can be pinched accurately. Thereby, even if the screw shaft is rusted or the screw 30 is in a state where the operation groove is deformed and crushed, the screw head 31 is accurately clamped and rotated in the loosening direction to be reliably removed from the fastening target. be able to.

  As described above, according to the present embodiment, the front regions of the jaws 13 and 13 are formed into the trapezoidal concave portions 18 and 18 that are outwardly spread when viewed from the distal end side by the plurality of tooth tips. Since the plurality of vertical pinching teeth 15 and 15 are formed on the bottom surface portions 18a and 18a and the both side surface portions 18b, 18b, 18b and 18b, the vertical pinching teeth 15 and 15 are rusted and have different diameters. Since the contact area between the 15 tooth tips and the screw head 31 increases, the screw head 31 can be securely clamped and removed.

  Further, according to the present embodiment, since the plurality of vertical pinching teeth 15 and 15 are formed at the same pitch and height, the contact between the tooth tips of the vertical pinching teeth 15 and 15 and the screw head 31 is brought into contact. Since the area is further increased, the screw head 31 can be more securely clamped and removed.

  Furthermore, according to the present embodiment, the plurality of vertical pinching teeth 15 and 15 are set to have a pitch of 1.50 mm and a height of 0.80 mm. Since the contact area between the tooth tip and the screw head 31 is further increased, the screw head 31 can be more securely held and removed.

  The embodiments described above are described for facilitating understanding of the present invention, and are not described for limiting the present invention.

  For example, in the pliers 10 of the above embodiment, the example in which the pitch between the plurality of vertical pinching teeth 15 and 15 is set to 1.50 mm and the height is set to 0.80 mm has been described, but these numerical values are merely examples. As long as the object can be securely held, a finer pitch may be used.

  Moreover, although the pliers 10 of the said embodiment demonstrated the example which removes the screw | thread 30 as a target object from fastening symmetry, it is applicable not only to this but another screw as a target object.

DESCRIPTION OF SYMBOLS 10 Plier 11 Arm 12 Connecting shaft 13 Jaw part 14 Handle part 14a Cover 15 Vertical pinion tooth 16 Horizontal pinch tooth 17 Cutting blade 17a Small diameter peel hole 18 Recess 18a Bottom face part 18b Side face part 20 Large diameter peel part 21 Protrusion part 22 Recess part 30 screws (object)
31 Screw head D1 diameter D2 diameter

Claims (3)

A pair of arms each having a jaw portion on the front end side and a pair of arms each having a handle portion on the rear end side are rotatably connected via a connecting shaft, and sandwich the object between the jaw portions. ,
The front region of each jaw is formed into a trapezoidal concave portion that spreads outward as viewed from the tip side by a plurality of tooth tips, and a plurality of vertical pinches along the front-rear direction of each bottom surface portion and each side surface portion of these concave portions A pliers characterized in that teeth are formed.   The pliers according to claim 1, wherein the plurality of vertical pinching teeth are formed at the same pitch.   The pliers according to claim 1 or 2, wherein the plurality of vertical pinching teeth are set to have a pitch of 1.50 mm and a height of 0.80 mm.

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