Rebar coupler

1. A rebar coupler comprising:

a housing which is a cylindrical hollow body having at one end a first opening for receiving a first rebar, at the other end a second opening for receiving a second rebar, to connect the first rebar and the second rebar, and a partition disposed at a center thereof to divide the ends having the first and second openings;

a mounting member inserted in each end of the housing and receiving the corresponding first and second rebars therein;

a plurality of coupling members slidably disposed on the corresponding mounting member and being brought into contact with an outer peripheral surface of the corresponding inserted first and second rebars to prevent the first and second rebars from moving out from the rebar coupler;

a resilient member configured to apply a restoring force to the coupling members so that the coupling members slid by the first and second rebars inserted in the corresponding mounting member are returned to an original position; and

a cover fastened to both ends of the housing to prevent the mounting member and the coupling members from moving out from the housing due to a tensile force of the first and second rebars,

each mounting members having a plurality of guide portions for guiding sliding movement of the coupling members along an inserting direction of the corresponding first and second rebars, a flange connecting ends of the guide portions, and a contact portion protruding from the flange towards the coupling members.

2. The rebar coupler according to claim 1 , wherein the contact portion is integrally formed with the flange, but is made from a material different from that of the flange.

3. The rebar coupler according to claim 2 , wherein the contact portion has first surfaces protruding from areas between the guide portions to be brought into contact with the coupling members, second surfaces disposed between the flange and the contact portion to be opposite to the first surfaces, and third surfaces for connecting both ends of the first surface and the second surface and deformed to correspond to a width of deformations of the corresponding first and second rebars if the first surfaces are pressed.

4. The rebar coupler according to claim 3 , wherein the third surface is formed in a shape of a slope or an arc.

5. The rebar coupler according to claim 3 , wherein each mounting member is provided with a spacing between the coupling members and the flange or between the contact portion and the guide portions in order to correspond to elastic deformation of a shape of the contact portions.

6. The rebar coupler according to claim 2 , wherein the contact portion contains at least one of rubber, silicon and a synthetic resin having elasticity.

7. The rebar coupler according to claim 1 , wherein an inner peripheral surface of the coupling members is provided with a threaded portion of a desired pattern which is brought into contact with an outer peripheral surface of the corresponding first and second rebars.

8. The rebar coupler according to claim 7 , wherein a tooth angle of the threaded portion of the coupling members is set in the range of 50 to 75°.

9. The rebar coupler according to claim 7 , wherein a tooth pitch of the threaded portion of the coupling members is set in the range of 0.4 to 1.3 mm.

10. The rebar coupler according to claim 1 , wherein at least one of the housing, the mounting member, the coupling members, the resilient member and the cover is made from a composite material containing at least one of glass fiber and a carbon fiber.