Facilitated tightening device

Abstract

A facilitated tightening device allowing a bolt to be inserted smoothly by preventing a screw block engaged with the bolt from being inclined or fallen down, comprising a base ( 2 ) having a bolt insert hole ( 7 ) partly forming a bolt receiving surface ( 9 ) and an inclined surface ( 8 ) gradually decreasing in diameter toward the insert side of the bolt ( 6 ) in the state of being continued with the bolt insert hole ( 7 ) formed therein, a screw block ( 3 ) slid along the inclined surface ( 8 ) according to the axial movement of the inserted bolt ( 6 ) to be engaged with the bolt ( 6 ), an energizing member ( 5 ) energizing the screw block ( 3 ) in inner radial direction, and guide means ( 10, 11 ) engaged with the screw block ( 3 ) to prevent the screw block ( 3 ) from being fallen down in the base ( 2 ).

What is claimed is:  
     
         1 . A simple fastening device wherein a running screw is supported by a slope portion that is formed in a bolt-insertion hole of a base, and a bolt is inserted into the bolt-insertion hole under the condition that the running screw is pressed by a pressing member, so that the running screw is engaged with the bolt, and wherein a guide means is engaged with said running screw, so that the running screw is prevented from slipping down in the base.  
     
     
         2 . A simple fastening device that comprises ( 1 ) a base, to which are formed (a) a bolt-insertion hole whose one portion is a bolt-receiving face, and (b) a slope portion whose diameter is gradually reduced toward the bolt-insertion side under the condition that it connects with the bolt-insertion hole, ( 2 ) a running screw that slides along said slope portion and is engaged with the bolt as the bolt to be inserted moves in its axial direction, ( 3 ) a pressing member for pressing the running screw downward, and ( 4 ) a guide means that engages with the running screw and prevents the running screw from slipping down in the base.  
     
     
         3 . A simple fastening device that comprises ( 1 ) a base to which are formed (a) a bolt-insertion hole, and (b) a plurality of slope portions whose diameters are gradually reduced toward the bolt-insertion side under the condition that they connect with the bolt-insertion hole, ( 2 ) a plurality of running screws that slide along the slope portions and are engaged with the bolts as the inserted bolt moves in its axial direction, ( 3 ) a pressing member for pressing the running screws downward, and ( 4 ) a guide means that is engaged with the running screws and prevents the running screws from slipping down in the base.  
     
     
         4 . A simple fastening device, as set forth in any of claims  1 - 3 , wherein said guide means comprises ( 1 ) a guide projection that is provided to the base in a manner so as to project toward the bolt-insertion side, and ( 2 ) a guide groove that is formed on said running screw so as to engage with the guide projection.  
     
     
         5 . A simple fastening device, as set forth in  claim 4 , wherein a cover into which said bolt can be inserted is attached to the base on the lower side of the bolt-insertion direction, and such that the aforementioned guide projection is provided on the cover.  
     
     
         6 . A simple fastening device, as set forth in  claim 4  or  5 , wherein said guide projection has a guide face that is inclined in the same direction as the sliding direction of said running screw, and such that the guide face is engaged with said guide groove.