Abstract:
Provided is a wire grip, which has excellent workability for bracing the wire and which can grip a linear object for bracing the wire without applying any excessive load to the linear object. 
     The wire grip comprises a stationary-side wire gripping portion having a body and a movable-side wire gripping portion, whereby a linear object can be gripped between them, where a first action portion for moving the movable-side wire gripping portion back and forth and a second action portion connected to the first action portion by a connecting rod are turnably attached to the body, whereby the connecting rod is pulled substantially parallel to the gripping portions so that the connecting rod, and the first and second action portions are linked to act to move the movable-side wire gripping portion towards the stationary-side wire gripping portion.

Description:
RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 13/259,033 filed on Nov. 30, 2011, which is the National Stage entry of International Application No. PCT/JP2009/061905 filed on Jun. 30, 2009, both of which are herein incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a wire grip used for gripping a linear object such as an electric wire, i.e. an electric power wire and a communication wire and an elevator wire to brace the linear object. 
     BACKGROUND OF THE INVENTION 
     Conventionally, for bracing the wire in an electric wire construction, a wire grip that grips the electric wire is used to pull the electric wire by a wire puller. 
     However, most of the conventional wire grips have problems of working inefficiency. For example a worker must move during a step of inserting a linear object (an electric wire) and a step of fixing the linear object by a grip member of the wire grip. Therefore, the wire grips have been required to improve their efficiency when they are used to brace wires in a dangerous situation such as work in high places and in a small area where work space is limited. 
     Therefore, the wire grip  500  described as follows has been suggested and introduced (see The Patent Document 1). The wire grip  500  has a structure in which a action portion  503  activates a movable-side wire gripping portion  52  to grip the linear object W when a stationary-side wire gripping portion  501  as described in  FIG. 5  is hung on the linear object and then a an arc-like pulling portion  504  inserted into an inserting opening  505  is pulled in the direction of an arrow A. And the wire grip  500  can also be operated easily by workers without moving from a front side of the wire grip  500 . 
     However, in the wire grip  500  shown in  FIG. 5 , since the pulling portion  504  is pulled in the direction of the arrow A (obliquely downward to the right as shown in  FIG. 5 ) when the linear object W is gripped, a clockwise moment as shown in  FIG. 5  is added to the wire grip  500 . Thus, excessive load is applied to the linear object W in a B portion and then the linear object W may curve. If the linear object W curves again and again, it leads to problems such that the life of the wire grip decreases and the wire grip can be damaged. 
     THE PRIOR ART DOCUMENT 
     The Patent Document 1: Japanese Patent Publication No. 2004-242477. 
     SUMMARY OF THE INVENTION 
     In view of problems described above, the problems to be solved by the invention are to provide the wire grip which has excellent workability for bracing the wire and can grip the linear object for bracing the wire without applying any excessive load to the linear object. 
     This invention associated with claim  1  relates to a wire grip which comprises a stationary-side wire gripping portion provided with a body and having a substantially straight front shape, and a movable-side wire gripping portion arranged to face the stationary-side wire gripping portion and set movable back and forth with respect to the stationary-side wire gripping portion, whereby the linear object can be gripped between the stationary-side wire gripping portion and the movable-side wire gripping portion, wherein a first action portion for moving the movable-side wire gripping portion back and forth and a second action portion connected to the first action portion by a connecting rod are turnably attached at their individual ends to the body, wherein the other end of the first action portion and the other end of the second action portion are turnably attached to one end of the connection rod and an intermediate portion of the connection rod, respectively, wherein the other end of the connecting rod is pulled substantially parallel to the stationary-side wire gripping portion and the movable-side wire gripping portion so that the connecting rod, the second action portion and the first action portion are linked to act to move the movable-side wire gripping portion forward with respect to the stationary-side wire gripping portion. 
     This invention associated with claim  2  relates to the wire grip described in claim  1 , wherein the other end of the connecting rod is located in the vicinity of an extension line of the movable-side wire gripping portion. 
     According to the invention associated with claim  1 , the wire grip comprises a stationary-side wire gripping portion provided with the body and having a substantially straight front shape, and a movable-side wire gripping portion arranged to face the stationary-side wire gripping portion and set movable back and forth with respect to the stationary-side wire gripping portion, whereby the linear object can be gripped between the stationary-side wire gripping portion and the movable-side wire gripping portion, wherein the first action portion for moving the movable-side wire gripping portion back and forth and the second action portion connected to the first action portion by the connecting rod are turnably attached at their individual ends to the body, wherein the other end of the first action portion and the other end of the second action portion are turnably attached to one end of the connection rod and an intermediate portion of the connection rod, respectively, wherein the other end of the connecting rod is pulled substantially parallel to the stationary-side wire gripping portion and the movable-side wire gripping portion so that the connecting rod, the second action portion and the first action portion are linked to act to move the movable-side wire gripping portion forward with respect to the stationary-side wire gripping portion, thereby allowing the movable-side wire gripping portion to move back and forth without bringing a moment to the wire grip. Thus, excessive load is less applied to the linear object which is gripped between the stationary-side wire gripping portion and the movable-side wire gripping portion. Therefore, it is less likely that the linear object may curve again and again and be damaged. In addition, since the wire grip can activate the movable-side wire gripping portion to grip the linear object by only hanging the stationary-side wire gripping portion on the linear object and pulling the pulling portion, A worker can easily operate the wire grip from the front side of the wire grip without moving, thus the wire grip is also excellent in workability. 
     According to the invention associated with claim  2 , the other end of the connecting rod can pull the connecting rod in a close position to the linear object because it is located in the vicinity of the extension line of the movable-side wire gripping portion. Therefore, the moment is less brought to the wire grip and no excessive load is applied to the linear object. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates an example for using the wire grip associated with the invention. 
         FIG. 2  illustrates a front view of the wire grip associated with the invention. 
         FIG. 3  illustrates a left-side view of the wire grip associated with the invention. 
         FIG. 4  illustrates a front view of the wire grip associated with the invention which is in a state of gripping the linear object. 
         FIG. 5  illustrates a front view of a conventional wire grip. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to the drawings, preferred embodiments of the wire grip associated with the invention are described below. 
       FIG. 1  illustrates a general example for using a wire grip  100  associated with the invention. Additionally, the front side of the sheets in  FIGS. 1 ,  2 , and  4  is considered to be the front side of the wire grip and the directions of top, bottom, left, and right of the sheets in  FIGS. 1 ,  2 , and  4  are considered to be the upside, downside, left-side, and right-side of the wire grip herein, respectively. However those directions of the wire grip associated with the invention may be different from those shown in the drawings when the wire grip is used. 
     As shown in  FIG. 1 , the wire grip  100  associated with the invention is connected with the wire puller  200  and used for bracing the wire. In particular, it is used for gripping the linear object W in applying tension by pulling the linear object W such as an elevator wire and an electric wire, i.e. an electric power wire and a communication wire with the wire puller  200 . 
     Although not shown in the drawings, the wire grip is also used for cutting and dividing the linear object W when the linear object becomes slack by an installation of the wire grip  100  both on one side and the other side of the wire puller  200 , gripping one linear object W with two wire grips  100 , and pulling the linear object W with the wire grips. 
       FIG. 2  illustrates the front view of the wire grip  100 , and  FIG. 3  illustrates the left-side view of the wire grip  100 . 
     As shown in  FIG. 2 , the wire grip  100  comprises a stationary-side wire gripping portion  1  provided with the top end of the body  10  and having the substantially straight front shape, and a movable-side wire gripping portion  2  which has the substantially straight front shape as well and is arranged to face the downside of the stationary-side wire gripping portion  1 . 
     Additionally, as shown in  FIG. 3 , the stationary-side wire gripping portion  1  is not only formed into a substantially L-shape integrally with the body  10  in a side view in this embodiment, but also can be provided as other members. 
     In addition, each cross section in a lateral view of the stationary-side wire gripping portion  1  and the movable-side wire gripping portion  2  is preferably in a V-shape or an arc-like shape in which each recess faces each other. More preferably, as shown in  FIG. 3 , it is preferable that the stationary-side wire gripping portion  1  is in the V-shape and the movable-side wire gripping portion  2  is in the arc-like shape. 
     Thus, the linear object can be positioned without any position gaps since the stationary-side wire gripping portion  1  in the V-shaped cross section is in contact with the linear object in a substantially circular in cross section view at  2  spots on the cross section of the stationary-side wire gripping portion  1 , and the movable-side wire gripping portion  2  in the arc-like shaped cross section can firmly grip the linear object since the surface of the movable-side wire gripping portion  2  is in contact with the peripheral surface of the linear object. Therefore, the linear object can be firmly positioned and fixed by gripping the linear object positioned in the stationary-side wire gripping portion  1  with the movable-side wire gripping portion  2 . 
     As shown in  FIG. 2 , one end of the first action portion  3  on the bottom and left end in the front view of the body  10  and one end of the second action portion  4  on the bottom and right end in the front view of the body  10  are turnably attached to the body  10  as a pivot  31  and a pivot  41 , respectively. These first action portion  3  and second action portion  4  extend from the body to the downside and substantially parallel to each other. 
     Additionally, the other end of the first action portion  3  and the other end of the second action portion  4  are turnably connected to the connecting rod  5  as a pivot  32  and a pivot  42 , respectively. 
     Furthermore, the first action portion  3  is substantially perpendicular to a line connecting the pivot  31  and the pivot  32  and the first action portion  3  extends from the vicinity of the pivot  31  to the right-side to take on a substantially L-shape as a whole. And the extended end is turnably connected to the movable-side wire gripping portion  2  as a working point  33  which moves together with the movable-side wire gripping portion  2  by a rotation of the first action portion  3  around the pivot  31 . 
     The pivot  32  and the pivot  42  are located on a left end in the front view and an intermediated portion of the connecting rod  5 , respectively. And on a right end in the front view of the connecting rod  5 , the pulling portion  6  is turnably attached to the connecting rod  5 , setting the left end in the front view as a pivot  61 . In addition, the pivot  32 ,  42 , and  61  are disposed in the substantially same straight line. A shape of the connecting rod  5  is not specifically limited, but the connecting rod is formed into a substantially straight shape in the illustrated examples. 
     It is preferable that a loop portion  62  is formed on the right end in the front view of the pulling portion  6  as shown in  FIG. 2 . This is because that the wire grip can be easily connected to the wire puller  200  by a hook of the wire puller  200  or the like in connecting the wire puller  200  as shown in  FIG. 1 . 
       FIG. 4  illustrates the front view of the wire grip which is in the state of gripping the linear object and describes actions of the wire grip  100 . To begin with, in  FIG. 2 , the linear object W (omitted in  FIG. 2 ) is located between the stationary-side wire gripping portion  1  and the movable-side wire gripping portion  2 , and is fit into the stationary-side wire gripping portion  1 . In this state, the connecting rod is pulled to the right-side in the front view substantially parallel to the stationary-side wire gripping portion  1 , more specifically, to the linear object W (omitted in  FIG. 2 ) with the pulling portion  62 . Also, the connecting rod  5  may be directly pulled by a wire of the wire puller  200  (omitted in  FIG. 4 ) or the like attached to the pivot  61  without the pulling portion  62 . 
     By pulling the connecting rod  5  to the right-side with the pulling portion  62 , the connecting rod  5  moves to the right-side, rotating in a clockwise fashion around the pivot  61  as shown in  FIG. 4 . Thereby, the first action portion  3  and the second action portion  4  are pulled to the right-side at the pivot  32  and  42 , rotating in a counterclockwise fashion around the pivot  31  and  41 . 
     At this point, since the working point  33  located in a position extending from the pivot  31  to the right-side moves to the upside, the movable-side wire gripping portion  2  connected to the first action portion  3  at the working point  33  moves to the upside, pressing down and gripping the linear object W fit into the stationary-side wire gripping portion  1 . 
     All the actions described above can be done from the front side of the wire grip. And a worker doesn&#39;t need to move around, thus the wire grip has excellent workability. 
     In addition, since the linear object W can be gripped by pulling the pulling portion  62  substantially parallel to the stationary-side wire gripping portion  1  and the movable-side wire gripping portion  2 , i.e. to the linear object W, it is unlikely that the moment is brought to the wire grip  100  and that excessive load is applied to the linear object W on the right end of the stationary-side wire gripping portion  1  or on the left end of the movable-side wire gripping portion  2 . 
     Thus, it is less likely that the linear object W may curve again and again, making the life of the wire grip decrease, and that the linear object W may be damaged. 
     Additionally, as shown in  FIG. 4 , the right end of the connecting rod  5  is preferably located in the vicinity of the extension line of the movable-side wire gripping portion  2 . Thus, the pivot  61  is preferably located in the vicinity of the linear object W. 
     Accordingly, when the connecting rod  5  is pulled substantially parallel to the stationary-side wire gripping portion  1  and the movable-side wire gripping portion  2 , i.e. to the linear object with the pulling portion  62 , the moment is much less brought to the wire grip  100  and there are no risks that the linear object W may retain the curved form, making the life of the wire grip decrease, and that the linear object W may be damaged without applying any excessive load to the linear object W on the right end of the stationary-side wire gripping portion  1  or on the left end of the movable-side wire gripping portion  2 . 
     Also, in  FIG. 4 , by increasing a radius of rotation of the first action portion  3  compared to a radius of rotation of the second action portion  4 , i.e. by setting the distance between the pivot  31  and  32  longer than the distance between the pivot  41  and  42 , the substantially straight shaped connecting rod  5  is inclined upward to the right in the front view, making the right end of the connecting rod  5  closer to the linear object W. However, the present invention is not specifically limited to this. 
     In addition, the wire grip  100  also can be equipped with a stopper  7  as shown in  FIGS. 2 and 4 . Accordingly, the linear object W can be prevented from dropping off, from the completion of fitting the linear object W to the stationary-side wire gripping portion  1  to the completion of gripping the linear object W by pulling the pulling portion  62 . 
     Also, in this embodiment, the stopper  7  can be attached not only to the stationary-side wire gripping portion  1  but also to the movable-side wire gripping portion  2 . 
     INDUSTRIAL APPLICABILITY 
     This invention is to be suitably utilized for the wire grip which grips the electric wire such as an electric power wire and a communication wire, the elevator wire or the like, and the linear object such as a chain. 
     REFERENCE SIGNS LIST 
     
         
         
           
               100  wire grip 
               10  body 
               1  stationary-side wire gripping portion 
               2  movable-side wire gripping portion 
               3  first action portion 
               4  second action portion 
               5  connecting rod