High-strength one-touch rebar coupler

Abstract

A high-strength one-touch rebar coupler includes a coupler body having a hollow portion in the longitudinal direction. The coupler body is formed in a helical shape to provide the inner peripheral surface of the hollow portion with a rebar fastening force in the circumferential direction. The coupler body includes a first guide helix coupling portion, which has first guide sloping portions that slope from the center portion of the hollow portion towards the outside of one side thereof, and a second guide helix coupling portion, which has second guide sloping portions that slope from the center portion of the hollow portion towards the outside of the other side thereof. A first fastening unit is screw-coupled to the first guide helix coupling portion and inserted into one side of the hollow portion. The first fastening unit includes first fastening members, which are slidably coupled to the first guide sloping portions.

The invention claimed is: 
     
       1. A high-strength one-touch rebar coupler comprising:
 a coupler body provided with a hollow portion formed in a longitudinal direction, the coupler body comprising a first guide screw coupling portion having a plurality of first guide slopes formed in a helical shape on an inner circumferential surface of the hollow portion to provide tightening force to a rebar in a circumferential direction and outwardly inclined from a central portion of the hollow portion to one side and a second guide the screw coupling portion having a plurality of second guide is slopes outwardly inclined from the central portion of the hollow portion to an opposite side; 
 a first tightening unit screw-coupled with the first guide screw coupling portion of the coupler body and inserted into one side of the hollow portion, the first tightening unit comprising a plurality of first tightening members each being provided with a first tightening screw coupling portion having a first tightening slope formed on an outer circumferential surface thereof so as to be slidably engaged with each of the first guide slopes and provide tightening force to a rebar to be connected by moving in a direction opposite to a radial direction when a tensile force acts on the rebar and a first gripping portion formed on an inner circumferential surface thereof to grip an outer circumferential surface of the rebar; 
 a second tightening unit screw-coupled with the second guide screw coupling portion of the coupler body and inserted into an opposite side of the hollow portion, the second tightening unit comprising a plurality of second tightening members each being provided with a second tightening screw coupling portion having a second tightening slope formed on an outer circumferential surface thereof so as to be slidably engaged with each of the second guide slopes and provide tightening force to a rebar to be connected by moving in the radial direction when a tensile force acts on the rebar and a second gripping portion formed on an inner circumferential surface thereof to grip an outer circumferential surface of the rebar; and 
 a stopper plate for defining coupling positions of the rebars provided to a boundary portion of the coupler body between the first guide screw coupling portion and the second guide screw coupling portion, 
 wherein the stopper plate is formed in a disc shape so as to be screw-coupled to one side of the first guide screw coupling portion or the second guide screw coupling portion and installed inside a central portion of the coupler body, and an edge of the disc-shaped stopper plate is bent according to an angle of helix of the first or second guide screw coupling portion, such that the stopper plate remains perpendicular to a longitudinal direction of the coupling body, and 
 wherein the first tightening unit comprising the first tightening members and the second tightening unit comprising the second tightening members are provided with at least one elastic support ring for maintaining the first tightening unit and the second tightening unit in an assembled state when the first tightening unit and the second tightening unit are inserted into the coupler body, and 
 wherein outer circumferential surfaces of the first tightening members constituting the first tightening unit are provided with support grooves for preventing the elastic support rings from being supported when the first tightening members are displaced. 
 
     
     
       2. The high-strength one-touch rebar coupler according to  claim 1 , wherein the inner circumferential surfaces of the first tightening members and the second tightening members are provided with a first coupling groove and a second coupling groove, respectively, to allow the first tightening members or the second leading members to be coupled with the rebar and rotated when the rebar rotates. 
     
     
       3. The high-strength one-touch rebar coupler according to  claim 1 , wherein the outer circumferential surfaces of the first tightening members and the second tightening members are provided with a first elastic deformation groove and a second elastic deformation groove, respectively, the first elastic deformation groove and the second elastic deformation groove being elastically or plastically deformed to allow the first tightening members or the second leading members to closely contact the outer circumferential surface of the rebar when the first tightening members or the second tightening members are brought into close contact with the outer circumferential surface of the rebar. 
     
     
       4. The high-strength one-touch rebar coupler according to  claim 1 , wherein the coupler body is divided into a first body member having the first guide screw coupling portion and a second body member having the second guide screw coupling portion, and is formed by screw coupling between the first body member and the second body member. 
     
     
       5. The high-strength one-touch rebar coupler according to  claim 1 , further comprising:
 an elastic member provided between the stopper plate and the first tightening unit and between the stopper plate and the second tightening unit, respectively. 
 
     
     
       6. The high-strength one-touch rebar coupler according to  claim 1 , wherein the inner circumferential surfaces of the first tightening members having the first gripping portion of the first tightening unit and the inner circumferential surfaces of the second tightening members having the second gripping portion of the second tightening unit are provided with protrusions. 
     
     
       7. The high-strength one-touch rebar coupler according to  claim 1 , further comprising:
 a protective cap coupled to an end of the coupler body to prevent foreign substances from being introduced into the coupler body when concrete is laid. 
 
     
     
       8. The high-strength one-touch rebar coupler according to  claim 1 , wherein the coupler body is divided into a first body member having the first guide screw coupling portion and a second body member having the second guide screw coupling portion, and is formed by screw coupling between the first body member and the second body member. 
     
     
       9. A high-strength one-touch rebar coupler comprising:
 a coupler body provided with a hollow portion formed in a longitudinal direction, the coupler body comprising a first guide screw coupling portion having a plurality of first guide slopes formed in a helical shape on an inner circumferential surface of the hollow portion to provide tightening force to a rebar in a circumferential direction and outwardly inclined from a central portion of the hollow portion to one side and a second guide the screw coupling portion having a plurality of second guide is slopes outwardly inclined from the central portion of the hollow portion to an opposite side; 
 a first tightening unit screw-coupled with the first guide screw coupling portion of the coupler body and inserted into one side of the hollow portion, the first tightening unit comprising a plurality of first tightening members each being provided with a first tightening screw coupling portion having a first tightening slope formed on an outer circumferential surface thereof so as to be slidably engaged with each of the first guide slopes and provide tightening force to a rebar to be connected by moving in a direction opposite to a radial direction when a tensile force acts on the rebar and a first gripping portion formed on an inner circumferential surface thereof to grip an outer circumferential surface of the rebar; and 
 a second tightening unit screw-coupled with the second guide screw coupling portion of the coupler body and inserted into an opposite side of the hollow portion, the second tightening unit comprising a plurality of second tightening members each being provided with a second tightening screw coupling portion having a second tightening slope formed on an outer circumferential surface thereof so as to be slidably engaged with each of the second guide slopes and provide tightening force to a rebar to be connected by moving in the radial direction when a tensile force acts on the rebar and a second gripping portion formed on an inner circumferential surface thereof to grip an outer circumferential surface of the rebar; 
 a stopper plate for defining coupling positions of the rebar provided to a boundary portion of the coupler body between the first guide screw coupling portion and the second guide screw coupling portion, wherein the stopper plate is formed in a disc shape so as to be screw-coupled to one side of the first guide screw coupling portion or the second guide screw coupling portion and installed inside a central portion of the coupler body, and an edge of the disc-shaped stopper plate is bent according to an angle of helix of the first or second guide screw coupling portion, such that the stopper plate remains perpendicular to a longitudinal direction of the coupling body, and 
 an elastic member provided between the stopper plate and the first tightening unit and between the stopper plate and the second tightening unit, respectively, 
 wherein the first tightening unit comprising the first tightening members and the second tightening unit comprising the second tightening members are provided with at least one elastic support ring for maintaining the first tightening unit and the second tightening unit in an assembled state when the first tightening unit and the second tightening unit are inserted into the coupler body, wherein the elastic member is formed of a plate-shaped member and includes an elastic body portion  75   a  supported by the stopper plate  50  and an elastic support  75   b  that protrudes upward from the elastic body portion  75   a  to support a lower surface of the rebar  300  such that the rebar can rotate smoothly, and the elastic support  75   b  is provided with a conical deforming projection which is deformable so as to allow ends of the rebar  300  to closely contact an upper surface of the stopper plate  30  as the first tightening unit  40  or the second tightening unit  50  moves according to rotation of the rebars and the rebars  300  are lowered.