Diametrically expanded groove cutting apparatus and expandable mechanism

Abstract

To provide a diametrically expanded groove cutting apparatus capable of simultaneously cutting a plurality of diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein, and to provide an expandable mechanism used in the diametrically expanded groove cutting apparatus. A diametrically expanded groove cutting apparatus comprising: a main body portion including a shank to be coupled to an electrical device; an intermediate expandable mechanism and a tip end side expandable mechanism disposed along an axial direction so as not to rotate with respect to the main body portion, the electrical device applying an axial rotation to the diametrically expanded groove cutting apparatus to cause the diametrically expanded groove cutting apparatus to be able to cut upper and lower diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein by using cutting blades disposed on the expandable mechanisms and, wherein: the diametrically expanded groove cutting apparatus is extensible; and the cutting blades diametrically expand or contract by a retracting operation or an extending operation of the diametrically expanded groove cutting apparatus.

1 . A diametrically expanded groove cutting apparatus comprising:
 a main body portion including a shank to be coupled to a driving portion; and   a plurality of expandable mechanisms disposed along an axial direction so as not to rotate with respect to the main body portion,   the driving portion applying an axial rotation to the diametrically expanded groove cutting apparatus to cause the diametrically expanded groove cutting apparatus to be able to cut a plurality of diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein by using cutting blades disposed on the expandable mechanisms, wherein:   the diametrically expanded groove cutting apparatus is extensible; and   the cutting blades diametrically expand or contract by a retracting operation or an extending operation of the diametrically expanded groove cutting apparatus.   
   
   
       2 . The diametrically expanded groove cutting apparatus according to  claim 1 , wherein:
 among the plurality of expandable mechanisms, an intermediate expandable mechanism coupled between a tip end side expandable mechanism disposed on a tip end side of the diametrically expanded groove cutting apparatus and the main body portion is removably attached to the tip end side expandable mechanism, the main body portion and the other intermediate expandable mechanism; and   the intermediate expandable mechanism includes a stiff portion sandwiched between the tip end side expandable mechanism and the main body portion.   
   
   
       3 . The diametrically expanded groove cutting apparatus according to  claim 2 , wherein the tip end side expandable mechanism is removably attached to the main body portion. 
   
   
       4 . The diametrically expanded groove cutting apparatus according to  claim 1 , wherein:
 each of the expandable mechanisms includes a core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in an extending direction by biasing means, and a flexible portion having an elastic property;   an expandable guiding portion is formed at a tip end portion of the core body;   the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and   the cutting blade is disposed on the slide portion.   
   
   
       5 . An expandable mechanism used in a diametrically expanded groove cutting apparatus capable of cutting a diametrically expanded annular groove on an inner peripheral wall of a preformed anchor prepared hole, wherein:
 the expandable mechanism is able to be detachably coupled to a main body portion included in the diametrically expanded groove cutting apparatus and the other expandable mechanism;   the expandable mechanism includes a core body which is coupled so as to be movable with respect to the main body portion in an axial direction within a predetermined range, and a flexible portion having an elastic property;   an expandable guiding portion is formed at a tip end portion of the core body;   the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and   a cutting blade is disposed on the slide portion.   
   
   
       6 . A diametrically expanded groove cutting apparatus comprising:
 a main body portion including a shank to be coupled to a driving portion; and   an expandable mechanism disposed so as not to rotate with respect to the main body portion,   the diametrically expanded groove cutting apparatus being able to cut a diametrically expanded annular groove on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein by causing a cutting blade formed on the expandable mechanism to rotate by applying an axial rotation to the main body portion using the driving portion, wherein:   the expandable mechanism includes a core body;   the core body is disposed so as to be extensible with respect to the main body portion;   the cutting blade diametrically expands or contracts by a retracting operation or an extending operation of the core body;   the main body portion includes a cotter hole or a cotter groove; and   the cotter hole or the cotter groove is able to cause the core body to move with respect to the main body portion in an extending direction by a cotter hit into the cotter hole or the cotter groove.   
   
   
       7 . The diametrically expanded groove cutting apparatus according to  claim 6 , further comprising:
 a main body side sleeve and a core body side sleeve disposed so as to be movable with respect to the main body portion in an axial direction;   biasing means for biasing the main body side sleeve and the core body side sleeve in such a direction that the main body side sleeve and the core body side sleeve are separated from each other; and   a stopper projection which is disposed on the main body portion to stop a movement of the main body side sleeve in such a direction that the main body side sleeve is separated from the core body side sleeve, wherein   in a state in which the core body side sleeve is coupled to the core body, and the main body side sleeve and the core body side sleeve are in contact with each other, part of the cotter hole or the cotter groove is covered by the main body side sleeve.   
   
   
       8 . The diametrically expanded groove cutting apparatus according to  claim 6 , wherein:
 a plurality of the expandable mechanisms are included;   among the plurality of the expandable mechanisms, an intermediate expandable mechanism coupled between a tip end side expandable mechanism disposed on a tip end side of the diametrically expanded groove cutting apparatus and the main body portion is removably attached to the tip end side expandable mechanism and the main body portion;   the intermediate expandable mechanism includes a stiff portion sandwiched between the tip end side expandable mechanism and the main body portion; and   the tip end side expandable mechanism is removably attached to the main body portion.   
   
   
       9 . The diametrically expanded groove cutting apparatus according to  claim 8 , wherein the intermediate expandable mechanism is removably attached to the other intermediate expandable mechanism. 
   
   
       10 . The diametrically expanded groove cutting apparatus according to  claim 6 , wherein:
 the expandable mechanism includes the core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in the extending direction by the biasing means, and a flexible portion having an elastic property;   an expandable guiding portion is formed at a tip end portion of the core body;   the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and   the cutting blade is disposed on the slide portion.   
   
   
       11 . The diametrically expanded groove cutting apparatus according to  claim 2 , wherein:
 each of the expandable mechanisms includes a core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in an extending direction by biasing means, and a flexible portion having an elastic property;   an expandable guiding portion is formed at a tip end portion of the core body;   the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and   the cutting blade is disposed on the slide portion.   
   
   
       12 . The diametrically expanded groove cutting apparatus according to  claim 3 , wherein:
 each of the expandable mechanisms includes a core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in an extending direction by biasing means, and a flexible portion having an elastic property;   an expandable guiding portion is formed at a tip end portion of the core body;   the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and   the cutting blade is disposed on the slide portion.   
   
   
       13 . The diametrically expanded groove cutting apparatus according to  claim 7 , wherein:
 a plurality of the expandable mechanisms are included;   among the plurality of the expandable mechanisms, an intermediate expandable mechanism coupled between a tip end side expandable mechanism disposed on a tip end side of the diametrically expanded groove cutting apparatus and the main body portion is removably attached to the tip end side expandable mechanism and the main body portion;   the intermediate expandable mechanism includes a stiff portion sandwiched between the tip end side expandable mechanism and the main body portion; and   the tip end side expandable mechanism is removably attached to the main body portion.   
   
   
       14 . The diametrically expanded groove cutting apparatus according to  claim 7 , wherein:
 the expandable mechanism includes the core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in the extending direction by the biasing means, and a flexible portion having an elastic property;   an expandable guiding portion is formed at a tip end portion of the core body;   the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and   the cutting blade is disposed on the slide portion.