Actuating mechanism for a movable arm of a pipe bender

Abstract

An actuating mechanism of a pipe bender includes a power source for delivering torque for displacing a movable arm with, and a transmission for passing on movement of the power source to the movable arm; the transmission includes a planetary gear set, a crown gear, and an actuating pinion; the movable arm is connected with an actuating shaft of the gear set so that it can be displaced when the gear set is actuated; the crown gear is securely connected with a central shaft of the gear set; the actuating pinion is securely connected with an output shaft of the power source, and directly engaged with the crown gear so that movement of the power source can be passed on to the gear set; the power source is hidden in a holding portion of the pipe bender to not stick out to occupy extra space.

1 . An actuating mechanism for a movable arm of a pipe bender, comprising: 
 a power source for delivering torque for displacing a movable arm of a pipe bender with; and    a transmission for passing on movement of the power source to the movable arm, the transmission including:    (1) a planetary gear set, the planetary gear set having a sun gear fixedly disposed in a front portion of the pipe bender, and a central shaft arranged in the sun gear for connection with the power source; the planetary gear set having an actuating shaft arranged in the sun gear, and connected to the movable arm for allowing the movable arm to move together therewith; the planetary gear set having a plurality of planet pinions rotary on respective shafts supported in position on the actuating shaft; the planet pinions being engaged with both the central shaft and a toothed inner side of the sun gear;    (2) a crown gear securely connected with a lower end of the central shaft of the planetary gear set; and    (3) an actuating pinion securely connected with an output shaft of the power source, and engaged with the crown gear.    
   
   
       2 . The actuating mechanism for a movable arm of a pipe bender as claimed in  claim 1 , wherein the power source is a gear reduction motor.  
   
   
       3 . An actuating mechanism for a movable arm of a pipe bender, comprising: 
 a power source for delivering torque for displacing a movable arm of a pipe bender with; and    a transmission for passing on movement of the power source to the movable arm, the transmission including:    (1) a planetary gear set, the planetary gear set having a sun gear fixedly disposed in a front portion of the pipe bender, and a central shaft arranged in the sun gear for connection with the power source; the planetary gear set having an actuating shaft arranged in the sun gear, and connected to the movable arm for allowing the movable arm to move together therewith; the planetary gear set having a plurality of planet pinions rotary on respective shafts supported in position on the actuating shaft; the planet pinions being engaged with both the central shaft and a toothed inner side of the sun gear;    (2) a crown gear securely connected with a lower end of the central shaft of the planetary gear set; and    (3) an actuating pinion securely connected with an output shaft of the power source, and engaged with the crown gear;    the power source including:    (1) a motor for delivering torque to the movable arm; and    (2) a second planetary gear set, the second gear set having a sun gear fixedly disposed in the front portion of the pipe bender; the second gear set having a central shaft arranged in the sun gear and securely connected with an actuating shaft of the motor to be rotary together with the actuating shaft; the output shaft of the power source being arranged in the sun gear; the second gear set having a plurality of planet pinions rotary on respective shafts supported in position on the output shaft; the planet pinions being engaged with both the central shaft and a toothed inner side of the sun gear.