JP4733221B1 - Open / close tool - Google Patents

Abstract

[PROBLEMS] An opening / closing tool in which an arm is always urged in an opening direction during work, and it can be gripped with a small force, is not easily fatigued, has good workability, and can be stored compactly and easily removed. Provide tools.
A pair of arms 1 and 1 each having a gripping portion 4 on one end side and a working portion 12 on the other end side are supported by a connecting shaft 2 so as to be openable and closable. At the end, the ends of both arms 3a and 3a of the flexural elastic body 3 that urges the arms 1 and 1 in the opening direction are attached so as to be reversible inside and outside, and locked inside the both arms 3a and 3a. As the means, the engaging members 32 and 32 are detachably provided.
[Selection] Figure 1

Description

  The present invention relates to an opening / closing tool such as pliers, nippers, and pliers.

  In an open / close tool in which a pair of arms are cross-connected by a connecting shaft, it is necessary to open one arm with a finger each time in order to return to the original open state after performing a grasping operation. In order to eliminate this inconvenience, there is one in which a coiled compression spring for biasing the arm in the opening direction is attached near the connecting shaft, which is already widely available on the market.

  However, this type of conventional open / close tool with a spring uses a spring with a relatively strong repulsive force because a force point (compression spring) is provided in the immediate vicinity of the fulcrum (connecting shaft). Therefore, a greater force was required for the operator to perform the grasping operation. For this reason, even if the work is performed for a short time, the hands and arms are easily fatigued, and the workability is inferior compared to an open / close tool having no urging force.

  Therefore, as a proposal for solving this problem, Document 1 discloses an open / close tool in which a U-shaped elastic body is integrally provided between the gripping portion and the gripping portion. By adopting such a configuration, the proposed opening / closing tool succeeds in making the distance between the fulcrum (connecting shaft) and the force point (U-shaped elastic body) longer than that of the conventional opening / closing tool, and the gripping operation is performed with less force. Can be done.

  However, in general, the opening / closing tool is often operated while finely adjusting its opening angle and closing force. In this case, for example, by gently holding the index finger of a gripping hand between the gripping part and the gripping part. I have control. However, if an extra member (the elastic body) is provided between the gripping portions as in Patent Document 1, it becomes a hindrance when the finger is moved, resulting in a problem that work efficiency is lowered.

  In addition, any of the conventional spring-loaded opening / closing tools and the proposal of Patent Document 1 are always in an open state even when not in use, so that they are bulky when stored in a tool box or the like, and the arms are entangled with other tools. It has a drawback that it is difficult to take out.

Japanese Patent Laid-Open No. 2001-300858

  The present invention has been made to eliminate the disadvantages of the conventional open / close tool. The purpose of the present invention is to provide an open / close tool in which the arm is always urged in the opening direction at the time of work, but it can be grasped with a small amount of labor. An object of the present invention is to provide an opening / closing tool that can be performed, is less fatigued, and has good workability.

  Another object of the present invention is to provide an opening / closing tool that can be stored compactly and easily taken out during storage, while being an opening / closing tool in which an arm is always urged in the opening direction during work.

In order to achieve such an object, the present invention provides an open / close tool in which a pair of arms each having a working portion on one end side and a gripping portion on the other end side are connected to each other by a connecting shaft so as to be openable and closable. The first feature is that both end portions of the bending elastic body for urging the arm in the opening direction are attached to the rear end portion so as to be reversible inside and outside.

  In other words, the open / close tool of the present invention has a spring with a conventional spring because the bending elastic body for applying an urging force is attached to the rear end of the gripping portion that is farthest from the connecting shaft (the fulcrum and the force point are greatly separated). The arm can be urged in the opening direction with a force smaller than that of the open / close tool, and the operator can perform the operation of grasping the arm with a small force. Therefore, even if opening and closing work is done for a long time, it is hard to get tired. In addition, since the bending elastic body is attached to the gripping part so that it can be flipped inside and outside, it is placed outside the gripping part during work so that it does not interfere with the movement of the operator's fingers. And can be made compact for easy storage.

Furthermore, the present invention has a second feature that the bending elastic body is provided with a locking means that can be engaged and disengaged and suppresses a biasing force in the opening direction of the arm when in the engaged state .

With such a configuration , when not in use, the arm can be kept closed by engaging the arm portion of the flexure elastic body using the locking means, and can be stored and stored in a compact manner .

  Here, the working part is a part that performs actual processing provided with a cutting blade and a clamping surface, and the bending elastic body is a member that has an elastic member bent and attached, and uses its restoring force. .

  In addition, the bending elastic body here is one that bends and performs an urging action using its elastic restoring force. In this embodiment, it is made of a resin material, but is not limited to this. Alternatively, for example, a metal torsion coil spring may be used. Further, the shape is not limited to a substantially U-shape, and may be, for example, a V-shape or a W-shape, and may be any shape as long as both arms are expanded by an elastic restoring force.

  The open / close tool of the present invention can be gripped with a small amount of labor, is less fatigued, and has good workability. Furthermore, there is an advantage that it can be stored compactly during storage and can be easily taken out.

It is a front view which shows the open state of the opening / closing tool concerning 1st Example of this invention. It is a perspective view which shows the open state of the opening / closing tool concerning 1st Example of this invention. It is a principal part expansion perspective view of the opening / closing tool concerning 1st Example of this invention. It is a principal part enlarged plan view of the opening / closing tool concerning 1st Example of this invention. It is a perspective view which shows the closed state of the opening / closing tool concerning 1st Example of this invention. It is a perspective view which shows the state which closed the opening / closing tool concerning 1st Example of this invention, and suppressed the restoring force of the bending elastic body by the latching means. It is a front view which shows the state which reversely accommodated the bending elastic body of the opening / closing tool concerning 1st Example of this invention. It is a front view which shows the open state of the opening / closing tool concerning 2nd Example of this invention. It is a principal part expansion perspective view of the opening / closing tool concerning 2nd Example of this invention. It is a front view which shows the state which reversely accommodated the bending elastic body of the opening / closing tool concerning 2nd Example of this invention. It is a principal part enlarged front view of the opening / closing tool concerning 3rd Example of this invention.

  Hereinafter, although one Embodiment of the opening-and-closing tool concerning this invention is described, it is not limited to this.

  1 to 7 show an embodiment in which the present invention is applied to pliers. In the figure, the pliers A are composed of a pair of arms 1 and 1, a connecting shaft 2 that pivotally supports the arms 1 and 1, and a bending elastic body 3 that biases the arms 1 and 1 in the opening direction.

  The arm 1 is made of a forged product, and a half clamping part 12a and a cutting blade 12b are formed as a working part 12 on one end side, and a gripping part 4 is provided on the other end side. In addition, the half body here refers to what functions as a pair, and the clamping parts 12a and 12a pair are combined to exert a clamping function, and the cutting blades 12b and 12b pair are combined to have a cutting function. Demonstrate. For the sake of convenience, the side on which the working unit 12 is formed is defined as the front end side (front side), and the side on which the gripping unit 4 is provided is defined as the base end side (rear side).

  The gripping part 4 is made of a resin-molded product, and since it is a forged product, it is attached to the hard arm 1 to soften the feel when gripped, and prevents fatigue during work and also serves as an anti-slip function. Yes. On the inner side of the rear end portion of the gripping portion 4, an inversion shaft 41, a stopper 41 a for preventing movement from the periphery of the inversion shaft 41 in the longitudinal direction, and further from the upper end periphery of the inversion shaft 41 toward the radially outer side. A stopper 41b that bulges out and protrudes integrally.

  The bending elastic body 3 is attached to the reversing shafts 41 and 41 so as to be reversible inside and outside, and urges the arms 1 and 1 in the opening direction. This will be described in more detail below.

  The flexural elastic body 3 is made of a resin molded product having an excellent elastic restoring force and has a substantially U-shape when viewed from the front. Each arm 3a, 3a has a reversal on the gripping portion 4 side at each end. A shaft hole 31 corresponding to the shaft 41 and a restraining groove 31a corresponding to the stopper 41a are formed. Further, on the inner side closer to the center than the shaft holes 31 and 31, engaging members 32 and 32 having a rectangular thin plate shape are provided as locking means, respectively, and the ends of the engaging members 32 and 32 are bent into a key shape. Hooks 32a and 32a having inclined outer surfaces are formed to face each other.

  The bending elastic body 3 is attached to the arms 1 and 1 in a state where the arms 1 and 1 are bent to such an extent that they have an elastic restoring force when the arms 1 and 1 are fully opened. Specifically, the shaft holes 31 and 31 at both ends on the bending elastic body 3 side are rotatably fitted to the reversing shafts 41 and 41 of the gripping portions 4 and 4. At this time, as shown in FIG. 4, if the gripping portion 4 and the bending elastic body 3 are on the same line in the longitudinal direction in plan view, the stoppers 41a and 41a on the arms 1 and 1 side and the restraining grooves on the bending elastic body 3 side 31a and 31a are fitted to prevent unnecessary bending of the bending elastic body 3.

  The hooks 32a and 32a at the tips of the engaging members 32 and 32 are set so as to be separated from each other when the arms are simply closed as shown in FIG. There is no hindrance to opening and closing work. In order to engage this, when the arms 1 and 1 are in the closed state, the arms 3a and 3a of the bending elastic body 3 are pressed and contracted in the direction in which they approach each other. Then, the tip portions of the hooks 32a and 32a first come into contact with each other, and the hook members 32 and 32a get over the respective outer inclined surfaces after being elastically deformed so that the engaging members 32 and 32 escape outward by being further compressed. (See FIG. 6).

  Once engaged, the state is maintained by the elastic restoring force of the bending elastic body 3, the urging force is suppressed, and the arms 1 and 1 cannot be opened (locked).

  In this state, the bending elastic body 3 is inverted inside and stored in a region formed between the gripping portions 4 and 4 as shown in FIG. Ejection work becomes easy. The bent elastic body 3 stored in the reverse direction is also collinear with the above-described arms 1 and 1 even at that position, and the free movement is suppressed by fitting the stoppers 41a and 41a and the suppression grooves 31a and 31a. Yes.

  When using the opening / closing tool of the present invention, first, the bending elastic body 3 is reversed and arranged outside (backward as viewed from the gripping portion). During the reversal, the restraining groove 31a is elastically deformed to expand and pass through the stopper 41a. Next, the arms 3a and 3a of the bending elastic body 3 are twisted in a direction in which the engaged hooks 32a and 32a are separated (opposite to the direction in which the hook 32a protrudes). Then, since the engaged state is released, if the hand that is grasped as it is is released, the respective engaging members 32 and 32 are returned to the original separated state by the elastic restoring force, and the arm 1 and 1 can be opened and closed. After that, it can be used without any change to a normal opening / closing tool.

  8 to 10 show a second embodiment of the present invention. In addition, in order to prevent complexity, the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the figure, the pliers B are composed of a pair of arms 1 and 1, a connecting shaft 2 that pivotally supports the arms 1 and 1, and a bending elastic body 5 that urges the arms 1 and 1 in the opening direction.

  A grip portion 6 is provided on the base end side of the arm 1, and a support portion 6 a extends rearward from the rear end edge of the grip portion 6. A shaft hole 61 for reversibly attaching the bending elastic body 5 is formed in the support portion 6a, and two ridges 62 and 62 extending in the longitudinal direction are formed on both sides of the shaft hole 61. Has been. The ridges 62 and 62 are provided in contact with both sides of the bending elastic body 5 to prevent the bending elastic body 5 from moving in the width direction.

  On the other hand, at the ends of both arms 5a and 5a on the side of the bending elastic body 5, there are integrally provided reverse shafts 51 and 51, and a stopper 51b that bulges radially outward from the upper edge of the reverse shaft 51. Further, a split groove 51c is engraved from the upper end surface of the reversing shaft 51 over the entire height of the reversing shaft. This split groove 51c is for making it easy to fit the reversing shaft 51 into the shaft hole 61 on the arm 1 side. Further, a locking pedestal member 52 is formed at the end edge of one arm portion 5a (upper arm portion in the figure) as a locking means, and the locking arm member 53 is seen from the other edge in a front view. It extends diagonally outward. A locking hole 52a is formed on the pedestal member 52 side, and a protrusion 53a is formed at the tip of the locking arm member 53 side correspondingly.

  The locking arm member 53 is swingable back and forth by its elasticity starting from the end of the arm, and is locked by swinging toward the base member 52 with the arms 1 and 1 closed as shown in FIG. The opening / closing operation of the arms 1 and 1 can be locked by inserting the projection 53a through the hole 52a.

  FIG. 11 shows Embodiment 3 of the present invention. Here, the locking arm member 54 extends inward (in a region surrounded by the bending elastic body 5), and the protrusion 54a is inserted through the locking hole 52a from the inside. Further, in this embodiment, by providing the hinge portion 54b curved inward between the arm portion 5a and the locking arm member 54, the rocking angle of the locking arm member 54 in the front-rear direction can be increased. In addition, the operation can be performed more smoothly.

  In the first, second, and third embodiments, as the locking means, the engaging members are projected from the both arm portions of the bending elastic body, respectively, but the invention is not limited thereto. The arm part may be used as it is as an engaging member, and a lock-like engaging member provided on the other arm part may be hooked on the arm part to be locked. The arm member may be extended by extending from one arm portion and locked by inserting the protruding end of the other arm portion into the locking hole.

DESCRIPTION OF SYMBOLS 1 Arm 12 Working part 2 Connecting shaft 3, 5 Bending elastic body 31, 61 Shaft hole 32 Engaging member 4, 6 Grip part 41, 51 Reverse shaft 52 Base member 53, 54 Locking arm member

Claims (1)

In an open / close tool in which a pair of arms having a working part on one end side and a gripping part on the other end side are connected to each other by a connecting shaft so as to be opened and closed.
Both end portions of a bending elastic body for urging the arm in the opening direction are attached to each rear end portion of the gripping portion so that the inside and outside can be reversed, and the bending elastic body can be engaged and disengaged. An opening / closing tool provided with a locking means for suppressing an urging force in the opening direction when in an engaged state.

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