Abstract:
The present invention provides a fastening device that allows an attachment operation to be simply and easily performed even by a single person, is capable of fastening and fixing with certainty, and is capable of reducing cost. A fastening device is configured by: a bolt in which a right screw is formed on one end portion and a left screw is formed on another end portion; a jig engaging section that is formed on one end portion or both end portions of the bolt such as to be capable of being rotated using a jig that rotates the bolt; and a right screw nut and a left screw nut that respectively screw onto the right screw in the one end portion of the bolt and the left screw in the other end portion.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a fastening device that can be used to fasten and fix together a column and a beam, a metal piece attached to a column and a beam, wood materials, and the like. 
     2. Description of the Related Art 
     Conventionally, when a column and a beam, a metal piece attached to a column and a beam, or wood materials are fastened and fixed together, a bolt insertion hole is formed in the column, the beam, the metal piece attached to a column, or the wood materials. A bolt then is inserted into the bolt insertion hole, and fastened and fixed by a nut. 
     In fastening and fixing using a bolt and a nut such as this, operations for stopping a head portion of the bolt from turning and for rotating the nut are required to be performed. There is a disadvantage in that these operations are difficult for a person to perform alone and are time consuming. 
     [Parent Literature 1] Utility Model Publication No. 2534717 
     [Patent Literature 2] Japanese Patent Application Laid-open Publication No. 2006-348543 
     SUMMARY OF THE INVENTION 
     The present invention has been achieved in light of such disadvantages of the past. An object of the present invention is to provide a fastening device that allows an attachment operation to be simply and easily performed even by a single person, is capable of fastening and fixing with certainty, and is capable of reducing cost. 
     The description above, other objects, and novel features of the present invention will become more completely clear when the following description is read with reference to the accompanying drawings. 
     However, the drawings are mainly for description and do not limit the technical scope of the present invention. 
     To achieve the above-described object, a fastening device of the present invention is configured by: a bolt in which a right screw is formed on one end portion and a left screw is formed on another end portion; a jig engaging section that is formed on one end portion or both end portions of the bolt such as to be capable of being rotated using a jig that rotates the bolt; and a right screw nut and a left screw nut that respectively screw onto the right screw in the one end portion of the bolt and the left screw in the other end portion. 
     EFFECTS OF THE INVENTION 
     As is clear from the description above, the present invention achieves the following effects: 
     (1) According to a first aspect, the right nut and the left nut screwed onto both end portions of the bolt can be moved in a fastening or loosening direction by the jig being engaged with the jig engaging sections formed in the bolt and rotated. 
     Therefore, a fastening operation can be simply and easily performed even by a single person, by merely placing the right nut and the left nut screwed onto both end portions of the bolt being placed in contact with the fastening members, and the bolt being rotated. 
     (2) As a result of above-described (1), the jig engaging section is merely required to be formed in the end portions of the bolt in which the right screw and the left screw are formed, the jig engaging section capable of being rotated using the jig. The structure is simple and can be easily manufactured. 
     (3) As a result of above-described (1), the fastening members are fastened at both end portions by the right screw nut and the left screw nut. Therefore, compared to a conventional technique of fastening and fixing from one direction using a bolt and a nut, fastening and fixing can be performed from both directions and in an even manner. In addition, compared to the number of times a nut is turned in the conventional technique using a bolt and a nut, the same fastening operation can be performed with substantially half the number of turns. 
     (4) According to a second aspect, effects similar to above-described (1) to (3) can be achieved. In addition, the right screw nut and the left screw nut can be easily inserted to the fastening positions. The fastening and fixing operation can be efficiently performed in a short amount of time. 
     (5) According to a third aspect, effects similar to above-described (1) to (3) can be achieved. In addition, the bolt can be inserted into a bolt insertion hole by the end portion of the bolt being struck with a hammer. A setting operation of one bolt can be efficiently performed. 
     (6) According to a fourth aspect, effects similar to above-described (1) to (3) can be achieved. The right screw nut and the left screw nut can be locked onto the fastening and fixing members by the tabs. Spinning of the right screw nut and the left screw nut can be prevented with certainty even when the bolt is rotated. The fastening and fixing operation can be performed with certainty. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         FIG. 1  is a front view of a first embodiment of the present invention; 
         FIG. 2  is a right-side view of the first embodiment of the present invention; 
         FIG. 3  is a left-side view of the first embodiment of the present invention; 
         FIG. 4  is a cross-sectional view taken along line  4 - 4  in  FIG. 1 ; 
         FIG. 5  is an explanatory diagram of a bolt according to the first embodiment of the present invention; 
         FIG. 6  is a planar view of an easily positioned nut according to the first embodiment of the present invention; 
         FIG. 7  is a vertical cross-sectional view of the easily positioned nut according to the first embodiment of the present invention; 
         FIG. 8  is an exploded perspective view of the easily positioned nut according to the first embodiment of the present invention; 
         FIG. 9  is an explanatory diagram of a state of use according to the first embodiment of the present invention; 
         FIG. 10  is an explanatory diagram of a state in which a bolt is inserted according to the first embodiment of the present invention; 
         FIG. 11  is an explanatory diagram of a state in which nuts are positioned on both end portions of the bolt according to the first embodiment of the present invention; 
         FIG. 12  is an explanatory diagram of a state in which the bolt is rotated, and fastening and fixing is performed according to the first embodiment of the present invention; 
         FIG. 13  is an explanatory diagram of another state of use according to the first embodiment of the present invention; 
         FIG. 14  is an explanatory diagram of another state of use according to the first embodiment of the present invention; 
         FIG. 15  is an explanatory diagram of another state of use according to the first embodiment of the present invention; 
         FIG. 16  is a front view of a second embodiment of the present invention; 
         FIG. 17  is a right-side view of the second embodiment of the present invention; 
         FIG. 18  is a left-side view of the second embodiment of the present invention; 
         FIG. 19  is a front view of a third embodiment of the present invention; 
         FIG. 20  is a right-side view of the third embodiment of the present invention; 
         FIG. 21  is a left-side view of the third embodiment of the present invention; 
         FIG. 22  is a front view of a fourth embodiment of the present invention; 
         FIG. 23  is a right-side view of the fourth embodiment of the present invention; 
         FIG. 24  is a left-side view of the fourth embodiment of the present invention; 
         FIG. 25  is a front view of a fifth embodiment of the present invention; 
         FIG. 26  is a right-side view of the fifth embodiment of the present invention; 
         FIG. 27  is a left-side view of the fifth embodiment of the present invention; 
         FIG. 28  is a front view of a sixth embodiment of the present invention; 
         FIG. 29  is a right-side view of the sixth embodiment of the present invention; and 
         FIG. 30  is a left-side view of the sixth embodiment of the present invention; 
     
    
    
     EXPLANATION OF REFERENCE NUMBERS 
     
         
           1 ,  1 A,  1 B,  1 C,  1 D, and  1 E: fastening device 
           2 : right screw 
           3 : left screw 
           4 ,  4 A,  4 B, and  4 C: bolt 
           5  and  5 A: rotating jig 
           6 : driver 
           7  and  7 A: jig engaging section 
           8  and  8 A: easily positioned right screw nut 
           9  and  9 A: easily positioned left screw nut 
           10 : slanted hole 
           11 : ring groove for washer attachment 
           12  and  12 A: nut main body 
           13 : guide piece 
           14 : right screw thread 
           15 : right screw nut segment 
           16 : bias spring housing chamber 
           17 : bias spring 
           18 : engaging piece 
           19 : tab 
           20  and  20 A: washer 
           21 : left screw thread 
           22 : left screw not segment 
           23 : joining section 
           24 : column composed of wood material 
           25 : bolt insertion hole 
           26 : connecting metal piece 
           27 : beam 
           28 : recessing section 
           29 : spacer 
           30 : hammer 
           31 : head section 
           32 : engaging hole 
           33 : flange section 
           34 : engaging piece 
           35 : bottom surface 
           36 : head section 
           37 : right screw nut 
           38 : left screw nut 
       
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention will be described in detail based on embodiments for carrying out the present invention shown in the drawings. 
     According to a first embodiment for carrying out the present invention shown in  FIG. 1  to  FIG. 12 , reference number  1  represents a fastening device of the present invention. The fastening device  1  is configured by a bolt  4 , a plus or minus jig engaging section  1 , an easily positioned right screw nut  8 , and an easily positioned left screw nut  9 . In the bolt  4 , a right screw  2  is formed on one end portion and a left screw  3  is formed on the other end portion. The plus or minus jig engaging section  7  is formed on one end portion of the bolt  4  or on both end portions of the bolt  4 . According to the present embodiment, the plus or minus jig engaging sections  7  and  7  are formed on both end portions of the bolt  4 . The plus or minus jig engaging sections  7  and  7  allow the bolt  4  to be located by a rotating jig  5 , such as a driver, a spanner, or a wrench. According to the present embodiment, the jig  5  is a driver  6 . The easily positioned right screw nut  6  can be screwed onto the right screw  2  of the bolt  4  and thrust into a predetermined position of the right screw  2  portion of the bolt  4 . The easily positioned left screw nut  9  can be screwed onto the left screw  3  of the bolt  4  and thrust into a predetermined position of the left screw  3  portion of the bolt  4 . 
     The easily positioned right screw nut  8  is configured by a nut main body  12 , guide pieces  13 , right screw nut segments  15 , a bias spring  17 , and a washer  20 . In the nut main body  12 , a slanted hole  10  of which the inner diameter becomes successively smaller is formed on an inner wall surface. An outer wall surface or the nut main body  12  is formed into a polygonal shape. A ring groove  11  for washer attachment is formed in an outer peripheral portion of a small-diameter end portion of the slanted hole  10 . At least two guide pieces  13  are formed in an axial center direction or the inner wall surface of the nut main body  12 , in the slanted hole  10  portion. According to the present embodiment, three guide pieces  13 ,  13 , and  13  are provided. The right screw nut segments  15 ,  15 , and  15  are attached between the three guide pieces  13 ,  13 , and  13 , such as to be slidable in the axial center direction and so as not to detach by the small-diameter slanted hole  10 . The right screw nut segments  15 ,  15 , and  15  each have a right screw thread  14  on the inner wall surface thereof that screws with the right screw  2  of the bolt  4 . The bias spring  17  is housed within a bias spring housing chamber  16  formed on the top surface of the slanted hole  10 , such as to urge the right screw nut segments  15 ,  15 , and  15  towards the small-diameter slanted hole  10  side at all times. The bias spring  17  is held within the bias spring housing chamber  16  by an end portion of the bias spring housing chamber  16  being crimped. In the washer  20 , engaging pieces  18  and  18  are formed that engage with the ring groove  11  for washer attachment of the nut main body  12 , and at least one tab  19  is formed that wedges into a fastening member composed of a wood material. According to the present embodiment, three tabs  19 ,  19 , and  19  are formed. 
     The easily positioned left screw nut  9  is configured by a nut main body  12 , guide pieces  13 , left screw nut segments  22 , a bias spring  17 , and a washer  20 . In the nut main body  12 , a slanted hole  10  of which the inner diameter becomes successively smaller is formed on an inner wall surface. An outer wall surface of the nut main body  12  is formed into a polygonal shape. A ring groove  11  for washer attachment is formed in an outer peripheral portion of a small-diameter end portion of the slanted hole  10 . At least two guide pieces  13  are formed in an axial center direction on the inner wall surface of the nut main body  12 , in the slanted hole  10  portion. According to the present embodiment, three guide pieces  13 ,  13 , and  13  are provided. The left screw nut segments  22 ,  22 , and  22  are attached between the three guide pieces  13 ,  13 , and  13 , such as to be slidable in the axial center direction and so as not to detach by the small-diameter slanted hole  10 . The left screw nut segments  22 ,  22 , and  22  each have a left screw thread  21  on the inner wall surface thereof that screws with the left screw  3  of the bolt  4 . The bias spring  17  is housed within a bias spring housing chamber  16  formed on the top surface of the slanted hole  10 , such as to urge the left screw nut segments  22 ,  22 , and  22  towards the small-diameter slanted hole  10  side at all times. The bias spring  17  is held within the bias spring housing chamber  16  by an end portion of the bias spring housing chamber  16  being crimped. In the washer  20 , engaging pieces  18  and  18  are formed that engage with the ring groove  11  for washer attachment of the nut main body  12 , and at least one tab  19  is formed that wedges into a fastening member composed of a wood material. According to the present embodiment, three tabs  19 ,  19 , and  19  are formed. 
     The fastening device  1  configured as described above joins columns  24  and  24  composed of wood materials, each in which a joining sect ion  23  is formed in an end portion, at the joining sections  23  and  23 , as shown in  FIG. 9 . A component in which bolt insertion holes  25  and  25  are formed that is capable of joining with the joining sections  23  and  23  is placed, and the bolt  4  is inserted into the bolt insertion holes  25  and  25 , as shown in  FIG. 10 . 
     Next, as shown in  FIG. 11 , the easily positioned right screw nut  8  is thrust onto the right screw  2  on one end of she bolt  4 , and the tabs  19 ,  19 , and  19  of the washer  20  are wedged into the column  24 . 
     In addition, the easily positioned left screw nut  9  is thrust onto the left screw  3  on the other end portion of the bolt  4 , and the tabs  19 ,  19 , and  19  of the washer  20  are wedged into the column  24 . 
     Then, the driver  6  is engaged with the plus or minus jig engaging section  7  in one end portion of the bolt  4  and rotated as shown in  FIG. 12 . As a result, the right screw nut segments  15 ,  15 , and  15  of the easily positioned right screw nut  8  are screwed onto the right screw  2  of the bolt  4 . The left screw nut segments  22 ,  22 , and  22  of the easily positioned left screw nut  9  are screwed onto the left screw  3  of the bolt  4 . The right screw nut segments  15 ,  15 , and  15  and the left screw nut segments  22 ,  22 , and  22  are moved in the directions of the columns  24  and  24 , or in other words, the fastening direction, thereby fastening and fixing together the joining sections  23  and  23  of the columns  24  and  24  and forming a single column. 
     The right screw  2  of the bolt  4  is in a screwed state with the right nut segments  15 ,  15 , and  15  of the easily positioned right screw  8 , and the left screw  3  of the bolt  4  is in a screwed state with the left nut segments  22 ,  22 , and  22  of the easily positioned left screw nut  9  as a result of the rotation of the bolt  4 . In addition, contact resistance is generated between the easily positioned right screw nut  8  and the washer  20 , and between the easily positioned left screw nut  9  and the washer  20 . Therefore, the easily positioned right screw nut  8  and the easily positioned left screw nut  9  can be prevented from rotating together with the bolt  4 . 
     The fastening device  1  of the present invention is used for the fastening and fixing of the column  24  and the column  24 , as shown in  FIG. 13 . In addition, the fastening device  1  is used for the fastening and fixing of a U-shaped connecting metal piece  26  that is fixed to the column  24  and is inserted into a recessing section  28 , the recessing section  28  into which the connecting metal piece  26  is inserted being formed in an end portion of a beam  27  connected to the column  24 , as shown in  FIG. 14 . In addition, the fastening device  1  is used for the fastening and fixing of the columns  24  and  24  composed of wood materials with a spacer  29  therebetween, as shown in  FIG. 15 . 
     Other Embodiments for Carrying Out the Invention 
     Next, other embodiments for carrying out the present invention will be described with reference to  FIG. 16  to  FIG. 30 . In the description of the other embodiments for carrying out the present invention, constituent sections that are the same as those according to the first embodiment for carrying out the present invention are given the same reference numbers. Redundant descriptions are omitted. 
     A second embodiment for carrying out the present invention shown in  FIG. 16  to  FIG. 18  mainly differs from the above-described first embodiment for carrying out the present invention regarding the following point. According to the second embodiment of the present invention, a jig engaging section  7 A that engages with a jig  5 A that rotates a spanner or a wrench is formed on one end portion or both end portions of a bolt  4 A. According to the second embodiment of the present invention, the jig engaging sections  7 A and  7 A are formed on both end portions of the bolt  4 A. A fastening device  1 A that is configured rising the bolt  4 A in which such jig engaging sections  7 A and  7 A are formed can achieve working effects similar to those according to the first embodiment for carrying out the present invention. 
     A third embodiment for carrying out the present invention shown in  FIG. 19  to  FIG. 21  mainly differs from the second embodiment for carrying out the present invention regarding the following point. According to the third embodiment of the present invention, a head section  31  is formed on one end portion or both end portions of a bolt  4 B. According to the third embodiment, the head sections  31  and  31  are formed on both end portions of the bolt  4 B. The right screw nut  8  and the left screw nut  9  can be inserted into the head sections  31  and  31 , and screw threads and the jig engaging sections  7 A and  7 A can be protected even when struck with a hammer  30 . In addition, according to the third embodiment of the present invention, the easily positioned right screw nut  8  and the easily positioned left screw nut  9  are used, each in which a flange section  33  having engaging holes  32  and  32  are formed in the nut main body  12 , and a washer  20 A is used that has the tabs  19 ,  19 , and  19  in which engaging pieces  34  and  34  are formed that engages with the engaging holes  32  and  32  of the flange section  33 . A fastening device  1 B that is configured using such a bolt  4 B, easily positioned right screw nut  8 , and easily positioned left screw nut  9  can achieve working effects similar to those according to the second embodiment for carrying out the present invention. 
     A fourth embodiment for carrying out the present invention shown in  FIG. 22  to  FIG. 24  mainly differs from the first embodiment for carrying out the present invention regarding the following point. According to the fourth embodiment of the present invention, an easily positioned right screw nut  8 A and an easily positioned left screw nut  9 A are used that each uses a circular cylindrical nut main body  12 A in which a plurality of tabs  19 ,  19 , and  19  are formed on a bottom surface  35 . A fastening device  1 C that is configured using such easily positioned right screw nut  8 A and easily positioned left screw nut  9 A can achieve working effects similar to those according to the first embodiment for carrying out the present invention. 
     A fifth embodiment for carrying out the present invention shown in  FIG. 25  to  FIG. 27  mainly differs from the first embodiment for carrying out the present invention regarding the following point. According to the fifth embodiment of the present invention, a head section  36  is formed on one end portion or both end portions of a bolt  4 C. According to the fifth embodiment of the present invention, the head sections  36  and  36  are formed on both end portions of the bolt  4 C. The head sections  36  and  36  allow the easily positioned right screw nut  8  and the easily positioned left screw nut  9  to be thrust thereon, while not allowing typical nuts to be screwed onto the right screw  2  and the left screw  3  of the bolt  4 C. A fastening device  1 D that is configured using the bolt  4 C formed as such can achieve working effects similar to those according to the first embodiment for carrying out the present invention. 
     A sixth embodiment for carrying out the present invention shown in  FIG. 28  to  FIG. 30  mainly differs from the first embodiment for carrying out the present invention regarding the following point. According to the sixth embodiment of the present invention, a right screw nut  37  to which the washer  20  is attached and a left screw nut  38  to which the washer  20  is attached are used. A fastening device IF that is configured using such right screw nut  37  to which the washer  20  is attached and left screw nut  38  to which the washer  20  is attached can achieve working effects similar to those according to the first embodiment for carrying out the present invention. 
     According to the above-described embodiments for carrying out the present invention, wood materials are used as the members to be fastened and fixed together. However, the present invention is not limited thereto. In instances in which the members to be fastened and fixed together are composed or metal alloys or iron, the present invention can be similarly used by use of a spring washer instead of the washer. The spring washer can be composed of any type of material as long as a repulsive function is provided. 
     In addition, according to the above-described embodiments for carrying out the present invention, a plurality of washers may be attached to the nut main body  12  ( 12 A). Alternatively, the nut may be attached with the plurality of washers therebetween. 
     Furthermore, the washer may be attached in a fixed manner to the members to be fastened and fixed together by a screw, by welding, or the like. 
     INDUSTRIAL APPLICABILITY 
     The present invention is used in an industry for manufacturing fastening devices used to fasten and fix together a column and a beam, a metal piece attached to a column and a beam, wood materials, and the like.