Rebar tying tool

Abstract

A rebar tying tool may be configured to tie rebars with a wire. The rebar tying tool may include: a contact member configured to contact the wire during a tying operation in which the rebar tying tool ties the rebars with the wire. The contact member may include: a base; and a surface layer covering at least a part of a surface of the base and configured to contact the wire during the tying operation. Hardness of the surface layer may be higher than hardness of the base.

What is claimed is: 
     
         1 . A rebar tying tool configured to tie rebars with a wire, the rebar tying tool comprising:
 a contact member configured to contact the wire during a tying operation in which the rebar tying tool ties the rebars with the wire,   wherein   the contact member comprises:
 a base; and 
 a surface layer covering at least a part of a surface of the base and configured to contact the wire during the tying operation, and 
   hardness of the surface layer is higher than hardness of the base.   
     
     
         2 . The rebar tying tool according to  claim 1 , wherein the surface layer is constituted of a ceramic material. 
     
     
         3 . The rebar tying tool according to  claim 2 , wherein the ceramic material includes tungsten carbide. 
     
     
         4 . The rebar tying tool according to  claim 1 , wherein a thickness of the surface layer is equal to or more than 10 micrometers. 
     
     
         5 . The rebar tying tool according to  claim 4 , wherein the thickness of the surface layer is equal to or less than 200 micrometers. 
     
     
         6 . The rebar tying tool according to  claim 1 , wherein the hardness of the surface layer is equal to or more than 900 HV. 
     
     
         7 . The rebar tying tool according to  claim 1 , further comprising:
 a feed motor; and   a feed roller configured to rotate with rotation of the feed motor and feed the wire toward the rebars,   wherein the contact member forms the feed roller.   
     
     
         8 . The rebar tying tool according to  claim 1 , further comprising a cutter configured to cut the wire during the tying operation,
 wherein the contact member forms the cutter.   
     
     
         9 . A rebar tying tool configured to tie rebars with a wire, the rebar tying tool comprising:
 a first contact member; and   a second contact member configured to contact the first contact member and move relative to the first contact member during a tying operation in which the rebar tying tool ties the rebars with the wire,   wherein   the first contact member comprises:
 a first base; and 
 a first surface layer covering at least a part of a surface of the first base, the second contact member comprises: 
 a second base; and 
 a second surface layer covering at least a part of a surface of the second base and configured to contact the first surface layer during the tying operation, 
   hardness of the first surface layer is higher than hardness of the first base, and   hardness of the second surface layer is higher than hardness of the second base.   
     
     
         10 . The rebar tying tool according to  claim 9 , wherein each of the first surface layer and the second surface layer is constituted of a ceramic material. 
     
     
         11 . The rebar tying tool according to  claim 10 , wherein the ceramic material includes tungsten carbide. 
     
     
         12 . The rebar tying tool according to  claim 9 , wherein each of a thickness of the first surface layer and a thickness of the second surface layer is equal to or more than 10 micrometers. 
     
     
         13 . The rebar tying tool according to  claim 12 , wherein each of the thickness of the first surface layer and the thickness of the second surface layer is equal to or less than 200 micrometers. 
     
     
         14 . The rebar tying tool according to  claim 9 , wherein each of the hardness of the first surface layer and the hardness of the second surface layer is equal to or more than 900 HV. 
     
     
         15 . The rebar tying tool according to  claim 9 , further comprising a cutter unit configured to cut the wire during the tying operation,
 wherein the cutter unit comprises the first contact member and the second contact member.   
     
     
         16 . A rebar tying tool configured to tie rebars with a wire, the rebar tying tool comprising:
 a feed roller configured to feed the wire toward the rebars when the rebar tying tool ties the rebars with the wire,   wherein   hardness of a surface layer of the feed roller is equal to or more than 900 HV.   
     
     
         17 . A rebar tying tool configured to tie rebars with a wire, the rebar tying tool comprising:
 a first feed roller configured to contact the wire and be rotated by a motor when the wire is fed toward the rebars; and   a second feed roller configured to contact the wire when the wire is fed toward the rebars,   wherein   the wire is clamped between the first feed roller and the second feed roller and fed toward the rebars by rotation of the first feed roller,   the first feed roller comprises a groove that the wire passes through when the wire is fed toward the rebars, and   hardness of the first feed roller in the groove is equal to or more than 1000 HV.