JP2011104662A - Plier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plier not requiring the whole of the plier to be replaced, even if a distal end part of the plier for pinching a pinching object wears. <P>SOLUTION: This plier includes a pinching part formed on one end side of each of a pair of lever members by intersecting and journaling the pair of lever members to pinch the pinching object, and a holding part formed on the other end side to open/close the pinching part. The pinching part, as a member in contact with the pinching object during pinching, includes a replacement pinching part attachable/detachable to/from the lever members. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a pliers that can be used continuously even if wear occurs at a tip portion for clamping an object to be clamped.

  Conventionally, in a pliers (pliers) for holding a target object by holding the target object with a pair of holding parts and applying force to the grip part, a signal is output when the torque applied to the grip part reaches a predetermined torque. Pliers are known (see, for example, Patent Document 1).

  In this pliers, for example, a toggle mechanism is built in one of a pair of levers of the pliers, and the toggle mechanism is activated when the torque for gripping the object to be pinched reaches a predetermined torque. And the signal which notifies that the target object was clamped with the force more than predetermined torque is output by the sensor which detects the action | operation of a toggle mechanism.

  According to such a plier, for example, when performing a work of grasping a clamp that fixes a hose and a connecting portion of the hose using the pliers and installing the clamp in a predetermined position, the clamp is grasped and released once. A signal can be output for each installation operation. Therefore, if you count the number of signals on the receiver side, you can check how many times the installation work has been done, and check whether you have forgotten to install it by comparing it with the required number of clamps installed. be able to.

JP-A-11-123663

  In the above-described pliers, when grasping an object such as a clamp, the object to be grasped is sandwiched and grasped by a pair of sandwiching portions at the tip of the pliers. Therefore, when a large force is applied to the clamping part, the object is very hard, or when many operations such as installing clamps are performed, the clamping surface is gradually formed. The tip is worn out.

  If the tip part directly holding the object to be clamped wears out, the object to be clamped cannot be held securely, and the pliers must be replaced. In particular, as described above, in the case of a plier that outputs a signal for each holding operation, a member that does not exist in a normal plier, such as a device for outputting a signal or a toggle mechanism, is provided. For this reason, there is a problem that the pliers must be replaced even when other members / equipment can still be used simply because the clamping portion is worn.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a pliers that do not require the entire pliers to be replaced even if the tip portions of the pliers that sandwich the object to be clamped are worn. To do.

  In order to solve the above-described problem, a plier according to the present invention is formed on one end side of the lever member by pivotally supporting a pair of lever members so as to cross each other, and the other end side And a gripping part that opens and closes the clamping part, wherein the clamping part is an exchangeable clamping part that can be attached to and detached from the lever member as a member that comes into contact with the sandwiched object during clamping. It is characterized by providing.

  ADVANTAGE OF THE INVENTION According to this invention, even if the front-end | tip part of the pliers which clamps a clamping object wears, the pliers which do not need to replace | exchange the whole pliers can be provided.

  In addition, by making the tip portion detachable, it is possible to provide a plier that can be replaced with a holding portion suitable for the use of the plier.

It is an external appearance and internal structure figure which shows the external appearance of the pliers by this Embodiment, and the internal structure in a part. It is an external view which shows the operation | movement of a plier when the plier shown in FIG. 1 is opened and closed. It is an external view of the exchange clamping part of the detachable clamping part of the pliers shown in FIG. FIG. 2 is an external view of a plier in which the replacement nip portion of the pliers shown in FIG. 1 is replaced with an exchange nip portion of another shape. FIG. 5 is an external view of a detachable replacement holding portion of the pliers shown in FIG. 4.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an appearance and a partial internal structure of the pliers 1 according to this embodiment, and FIG. 2 is a diagram showing an opening / closing operation of the pliers 1. The pliers 1 are configured such that a pair of levers 100 and 200 are overlapped and pivotally supported by a support shaft 12 so that the first lever 100 and the second lever 200 intersect on the front side and the rear side of the support shaft 12. Composed. The first lever 100 and the second lever 200 are formed with gripping portions 8 and 10 that are gripped by the operator on the rear side from the support shaft 12, and can be attached to and removed from the front side of the support shaft 12. 2b) is formed so as to form a scissors structure on the distal end side of the gripping portions 8, 10 for holding the holding object.

  The first lever 100 includes a sandwiching portion 4 and a gripping portion 8, wherein a shaft portion 4 a extending from the sandwiching portion 4 is connected by a toggle mechanism 62 inside the cylindrical gripping portion 8. The connecting member 8 a on the gripping part side connected by the shaft part 4 a and the toggle mechanism 62 is pressed to the front side (support shaft 12 side) by a spring 8 b inside the gripping part 8.

  On the other hand, the second lever 200 is an integral member from the clamping unit 6 to the gripping unit 10.

  With the structure of the first lever 100 and the second lever 200, the gripping portions 8 and 10 are sandwiched between the replacement sandwiching portions 2 of the sandwiching portions 4 and 6, and the gripping portions 8 and 10 are gripped to apply force to the sandwiching target object. When the torque exceeds a predetermined torque, the connecting member 8a is pushed back toward the rear end against the force of the spring 8b, and the toggle mechanism 62 operates. The operation of the toggle mechanism 62 can be detected by a sensor as a not-shown clamping detection unit arranged in the case 20, and a detection signal can be transmitted by a radio transmitter (not shown) that is also arranged in the case 20. . For example, a signal can be output by mechanically switching a sensor such as a microswitch with a spending pin (not shown) that has been spent outside the grip 8 from the connecting member 8a.

  Further, by adjusting the urging force to the spring 8b and changing the force for pressing the connecting member 8a, the torque at which the toggle mechanism 62 operates can be adjusted. Therefore, the clamping operation of the clamping object with an arbitrary torque is detected. be able to.

  For this reason, for example, when installing a clamp for fixing various hoses arranged in the engine room of an automobile to the hose connection part, to clamp the clamp and expand it to a diameter that can be installed in the hose connection part The necessary torque is measured in advance, and the biasing force of the spring 8b is set so that the toggle mechanism 62 operates when a torque equal to or greater than the predetermined torque is applied to the pliers 1. As a result, the toggle mechanism 62 is actuated once for each operation of grasping the clamp by the pliers 1, opening the clamp by applying a force of a predetermined torque or more, and installing the clamp at a predetermined position, and a detection signal is output. The Therefore, the number of operations such as the above-described clamp installation operation can be counted by the detection signal transmitted from the pliers 1.

  A spring 14 is attached to the first lever 100 and the second lever 200. In a state where no force is applied in the closing direction with respect to the gripping portions 8 and 10, the holding portions 4 and 6 are opened by the action of the spring 14 as indicated by broken lines in FIG. 2. Thereby, for example, when the operator grasps the gripping portions 8 and 10, grasps the clamp and installs the clamps in a predetermined position, and then loosens the gripping of the gripping portions 8 and 10, the sandwiching portions 4 and 6 open naturally. It is possible to quickly move to the next gripping operation.

  Further, a stopper 82 is formed in the middle of the grip portion 10 of the second lever 200 to prevent the toggle mechanism 62 from operating when nothing is clamped. The stopper 82 comes into contact with the gripping portion 8 of the first lever 100 and closes the gripping portion 8 when the gripping portions 8 and 10 are closed without holding the object to be pinched between the gripping portion 4 and the gripping portion 6. 8, Gripping force acting on 10 is received. As a result, the torque around the support shaft 12 does not act on the first lever 100, so that the toggle mechanism 62 is prevented from operating and transmitting a detection signal in a state where the object to be clamped is not sandwiched. Can do.

  As described above, the first lever 100 and the second lever 200 have an asymmetric structure, but the pliers 1 of the present embodiment pass through the clamping position and the support shaft formed by the exchange clamping parts 2a and 2b. The center line L and the grip 8 of the first lever 100 and the grip 10 of the second lever 200 are formed so as to be parallel to each other.

  In the pliers 1 of the present embodiment having the above-described configuration, as described above, the exchange clamping unit 2 that contacts the clamping object of the clamping unit 4 and the clamping unit 6 is connected to the first lever 100 and the second lever 200. On the other hand, it is removable. In FIG. 3, the external view of only the exchange clamping part 2 attached to the front-end | tip part of the clamping parts 4 and 6 of the pliers 1 of this embodiment shown in FIG. 1 is shown. 3A shows the replacement holding portion 2b attached to the holding portion 6 of the second lever 200, and FIG. 3B shows the replacement holding portion 2a attached to the holding portion 4 of the first lever 100. (C) is a view of the replacement holding portion 2a as viewed from the direction of the arrow D shown in (B), and (D) is a view of the replacement holding portion 2 as viewed from the front end side of the pliers 1.

  First, the front end portions of the sandwiching portions 4 and 6 of the first lever 100 and the second lever 200 of the pliers 1 according to the present embodiment are located on the front side in plan view in FIG. Although the front-end | tip part of 4 is located in the back | inner side, it has a mutually symmetrical shape with respect to the position where the exchange clamping parts 2a and 2b mesh. Moreover, the front-end | tip part of these clamping parts 4 and 6 is formed in the thickness of about half of the thickness in the Z-axis direction which is the axial direction of the spindle 12 of the exchange clamping parts 2a and 2b attached to each.

  The replacement holding parts 2a and 2b attached to the holding parts 4 and 6 are the same members having the same shape, and in a state where they are attached to the holding parts 4 and 6, they have a front-back relationship. This is because, as described above, the shapes of the tip portions of the sandwiching portions 4 and 6 are symmetrical, and the replacement sandwiching portion 2 that is the same member is turned upside down so Can also be attached.

  The replacement clamping portions 2a and 2b are formed with a vertical surface 2e parallel to the clamping surface for sandwiching the object to be clamped, and a horizontal surface 2f perpendicular to the vertical surface (parallel to the opening / closing operation surface of the pliers 1). . A hook-shaped portion formed by the vertical surface 2e and the horizontal surface 2f is attached to the distal end portion of the sandwiching portions 4 and 6, and the screws 16a and 16b are passed through the screw through holes 2c and 2d to be distal end portions of the sandwiching portions 4 and 6. The replacement clamping parts 2 a and 2 b can be fixed to the tip parts of the clamping parts 4 and 6 by being screwed together.

  The replacement sandwiching portions 2a and 2b are accurately positioned at the front ends of the sandwiching portions 4 and 6 by the vertical surface 2e, the horizontal surface 2f, and the screws 16a and 16b, so that the sandwiching surfaces of the replacement sandwiching portions 2a and 2b are formed. The tooth portions 2g can be attached so as to closely mesh with each other with the pliers 1 closed. Further, the replacement holding portions 2a and 2b can be firmly fixed to the front end portions of the holding portions 4 and 6 with no backlash by the mounting structure of the changing holding portions 2a and 2b.

  Furthermore, with such an attachment structure, when the pliers 1 are closed, the replacement holding portions 2a and 2b of the present embodiment receive force so as to be pushed directly in the holding direction from the tip portions of the holding portions 4 and 6. The object can be held. Therefore, even if the clamping portion is a separate member that can be attached to and detached from the first lever 100 and the second lever 200, the clamping force can be reliably transmitted.

  As described above, the replacement holding portions 2a and 2b are made detachable so that only the replacement holding portion 2 is replaced even when the tooth portion 2g of the replacement holding portion 2 is worn during the operation of holding the holding object. The main part of the pliers 1 can be used as it is. In particular, as described in the present embodiment, in the case of a pliers having a function of transmitting a detection signal for each clamping operation, the replacement clamping unit can be replaced, so that all the pliers are replaced. Compared with this, the cost can be greatly reduced.

  Furthermore, the shape of the tip of the sandwiching portions 4 and 6 is made symmetrical, and the replacement sandwiching portion 2 (2a, 2b) having the same shape can be used, so that either one of the pair of replacement sandwiching portions 2 can be used. Even if it is worn out, only one of them can be replaced. Moreover, since the replacement holding part 2 having the same shape can be attached to any of the holding parts 4 and 6, it is possible to obtain only one type of replacement holding part. .

  In addition, what was formed with the material with high hardness which is hard to produce abrasion as this exchange clamping part 2a, 2b can also be used. Accordingly, wear can be suppressed, and the cost of the pliers can be suppressed as compared with the case where the entire pliers 1 are made of a material having high hardness. Further, when the object to be clamped has a low hardness such as resin or wood, the replacement clamping parts 2a and 2b can be made of resin or the like accordingly.

  Further, by making the replacement holding part 2 detachable, it is possible to replace the replacement holding part 2 shown in FIG. 1 with an exchange holding part 2 ′ having a different shape as shown in FIG. Can also be obtained. FIG. 4 is an external view of the pliers 1 in which the replacement clamping part 2 of the pliers 1 shown in FIG. 1 is replaced with an exchange clamping part 2 ′ having a long length and a thin tip, and FIG. 2 'shows an external view (FIG. 5A shows an external view of the replacement holding portion 2b' attached to the holding portion 6 of the second lever 200, and FIG. 5B shows an attachment to the holding portion 4 of the first lever 100. (C) shows the appearance of the replacement sandwiching portion 2a ′ as viewed from the direction of the arrow D shown in (B)).

  In the case of exchanging from the exchange clamping part 2 of the pliers 1 shown in FIG. 1 to the exchange clamping part 2 ′ shown in FIG. 4, the screws 16a and 16b of the exchange clamping part 2 shown in FIG. 2a and 2b are removed from the clamping parts 4 and 6. Then, the hooks 4 and 6 of the pliers 1 are fitted to the hooks similar to the replacement holding parts 2a and 2b formed in the replacement holding parts 2a ′ and 2b ′, and again by the screws 16a and 16b. By fixing, it can be exchanged to the exchange holding parts 2a ′ and 2b ′.

  Thus, for example, the main body of the pliers 1 is the same by exchanging the replacement pinching portion 2 shaped as the normal pliers shown in FIG. 1 with the exchange pinching portion 2 ′ having a thin tip as shown in FIG. Can be used as a radio pliers-type pliers. Therefore, an optimal replacement clamping unit can be used according to the object to be clamped and the usage situation.

  In the present embodiment, it has been described that the replacement clamping unit is replaceable in the pliers configured to transmit a detection signal when the torque to be clamped becomes a predetermined torque, but the present invention is not limited to this. The present invention is also applicable to ordinary pliers, pliers and the like that do not include a transmission member or a toggle mechanism.

DESCRIPTION OF SYMBOLS 1 Plier 2 (2a, 2b) Exchange clamping part 2e Vertical surface 2f Horizontal surface 2g Tooth part 4, 6 Clamping part 8, 10, Grasping part 12 Support shaft 14 Spring 16a, 16b Screw 62 Toggle mechanism 100 1st lever 200 2nd lever

Claims (4)

A pair of lever members intersecting each other and pivotally supported, and formed on one end side of the lever member to sandwich the object to be sandwiched, a gripping portion formed on the other end side to open and close the sandwiching portion, In a pliers comprising:
The said clamping part is provided with the exchange clamping part which can be attached or detached with respect to the said lever member as a member which contacts the said clamping object at the time of clamping.   The pliers according to claim 1, further comprising a clamping detection unit that detects that the clamping object is clamped with a predetermined torque.   The pliers according to claim 1 or 2, wherein the exchange clamping part has the same shape that can be attached to and detached from any of the clamping parts of the pair of lever members. The pliers according to any one of claims 1 to 3, wherein the exchange clamping part can be exchanged for an exchange clamping part having a different shape or material.

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