Fastening tool

Abstract

A fastening tool includes a housing, a handle, an anvil, a pin-gripping part, a motor, and a driving mechanism. The driving mechanism is configured to move the pin-gripping part along a first axis defining a front-rear direction, relative to the anvil. The driving mechanism includes a rotary member, a movable member, a driving gear and an idler gear. The rotary member has a driven gear formed on its outer periphery and is rotatable around the first axis. The movable member is connected to the pin-gripping part and configured to be linearly moved in the front-rear direction by rotation of the rotary member. The driving gear is configured to be rotated around a second axis extending in parallel to the first axis below the first axis. The idler gear is engaged with the driving gear and the driven gear.

What is claimed is: 
     
         1 . A fastening tool configured to fasten workpieces via a fastener having a pin and a cylindrical part, the fastening tool comprising:
 a housing extending along a driving axis, the driving axis defining a front-rear direction of the fastening tool;   an anvil configured to abut on the cylindrical part of the fastener, the anvil being connected to a front end portion of the housing so as to extend along the driving axis, by being directly threadedly engaged with the housing, or via a connecting member threadedly engaged with the housing;   a pin-gripping part configured to grip the pin and held to be movable along the driving axis relative to the anvil;   a motor housed in the housing;   a rotary member supported by the housing so as to be rotatable around the driving axis, the rotary member being configured to be rotationally driven by power of the motor;   a movable member connected to the pin-gripping part, the movable member being engaged with the rotary member and configured to be linearly moved in the front-rear direction when the rotary member is rotationally driven; and   a receiving part disposed between the rotary member and the anvil or between the rotary member and the connecting member in the front-rear direction, the receiving part being configured to receive a forward axial force applied from the rotary member and not via the housing, and transmit the axial force to the anvil or the connecting member, the forward axial force being generated in response to rearward movement of the movable member.   
     
     
         2 . The fastening tool as defined in  claim 1 , wherein the receiving part includes a thrust bearing. 
     
     
         3 . The fastening tool as defined in  claim 2 , wherein the receiving part includes an intervening member at least partially disposed between the thrust bearing and the anvil or between the thrust bearing and the connecting member in the front-rear direction. 
     
     
         4 . The fastening tool as defined in  claim 3 , wherein:
 the thrust bearing includes a rotation part configured to rotate together with the rotary member, and   the intervening member is inserted through the thrust bearing.   
     
     
         5 . The fastening tool as defined in  claim 1 , wherein:
 the front end portion of the housing is threaded, and the anvil or the connecting member is also threaded, and   a direction of threadedly engaging the housing and the anvil or the connecting member is opposite to a direction in which the rotary member is rotated when the movable member is moved rearward.   
     
     
         6 . The fastening tool as defined in  claim 1 , wherein a rear end surface of the anvil or the connecting member is held in contact with the receiving part. 
     
     
         7 . The fastening tool as defined in  claim 1 , wherein the receiving part is arranged in non-contact with the housing in the front-rear direction. 
     
     
         8 . The fastening tool as defined in  claim 1 , wherein the anvil, or both the anvil and the connecting member are formed of iron or iron-based alloy. 
     
     
         9 . The fastening tool as defined in  claim 1 , wherein:
 the pin-gripping part is held to be slidable along the driving axis within at least one of the anvil and the connecting member, and   a sealing member is disposed on an outer periphery of the pin-gripping part to seal a gap between the pin-gripping part and the anvil or between the pin-gripping part and the connecting member.   
     
     
         10 . A fastening tool configured to fasten workpieces via a fastener having a pin and a cylindrical part, the fastening tool comprising:
 a housing extending along a driving axis, the driving axis defining a front-rear direction of the fastening tool;   an anvil configured to abut on the cylindrical part of the fastener, the anvil being connected to a front end portion of the housing so as to extend along the driving axis, by being directly threadedly engaged with the housing, or via a connecting sleeve threadedly engaged with the housing;   a jaw assembly configured to grip the pin and held to be movable along the driving axis relative to the anvil;   a motor housed in the housing;   a nut supported by the housing so as to be rotatable around the driving axis, the nut being configured to be rotationally driven by power of the motor;   a movable shaft connected to the jaw assembly, the movable shaft being engaged with the nut and configured to be linearly moved in the front-rear direction when the nut is rotationally driven; and   a receiving part disposed between the nut and the anvil or between the nut and the connecting sleeve in the front-rear direction, the receiving part being configured to receive a forward axial force applied from the nut and not via the housing, and transmit the axial force to the anvil or the connecting sleeve, the forward axial force being generated in response to rearward movement of the movable shaft.   
     
     
         11 . The fastening tool as defined in  claim 10 , wherein:
 the front end portion of the housing is threaded, and the anvil or the connecting sleeve is also threaded, and   a direction of threadedly engaging the housing and the anvil or the connecting sleeve is opposite to a direction in which the nut is rotated when the movable shaft is moved rearward.   
     
     
         12 . The fastening tool as defined in  claim 11 , wherein:
 the receiving part includes a thrust bearing and a flange sleeve that are arranged in non-contact with the housing in the front-rear direction,   the flange sleeve includes:
 a cylindrical part inserted through the thrust bearing and disposed between the movable shaft and the thrust bearing in a radial direction of the movable shaft; and 
 a flange disposed between the thrust bearing and the anvil or between the thrust bearing and the connecting sleeve in the front-rear direction, and 
   a rear end surface of the anvil or the connecting sleeve is held in contact with a front end surface of the flange.   
     
     
         13 . The fastening tool as defined in  claim 11 , wherein:
 the receiving part includes a thrust bearing arranged in non-contact with the housing in the front-rear direction; and   a rear end surface of the anvil or the connecting sleeve is held in contact with the thrust bearing.