Power operated scribe saw

A power operated tool comprising:

• an elongated handle assembly extending along a longitudinal axis of the handle assembly;
• a head assembly coupled to the handle assembly, the head assembly including a frame body, a drive train and a cutting blade assembly, including a cutting blade rotatably driven by the drive train about a cutting blade axis of rotation;
• the drive train comprising:
• a worm screw driveshaft rotating about a longitudinal drive shaft assembly axis of rotation, the worm screw driveshaft having a proximal end and a distal end;
• a worm screw rotating with the worm screw driveshaft, the worm screw positioned intermediate the proximal and distal ends of the worm screw driveshaft;
• a blade driveshaft including a first end and a second end and rotating about the cutting blade axis of rotation, the cutting blade coupled to and rotating with the blade driveshaft;
• a worm gear rotating with the blade driveshaft, the worm screw and worm gear operatively coupled such that rotation of the worm screw driveshaft about the longitudinal drive shaft assembly axis of rotation causes rotation of the blade driveshaft, the worm gear and cutting blade about the cutting blade axis of rotation;
• the frame body including a first side wall and a second side wall spaced apart by a front wall and a back wall, a through bore extending along a frame body longitudinal axis and a transversely extending recess extending into the first side wall in a direction toward the second side wall and opening into the through bore;
• a worm screw driveshaft support assembly supporting the worm screw driveshaft for rotation about the longitudinal drive shaft assembly axis of rotation and including a first bearing support engaging at least a portion of the worm screw driveshaft extending between the distal end of the worm screw driveshaft and the worm screw and a second bearing support and engaging at least a portion of the worm screw driveshaft extending between the proximal end of the worm screw driveshaft and the worm screw wherein a distal end of the through bore of the frame body is sized to receive a cap, the cap including a longitudinally extending seating surface which receives and supports the first bearing support.

A power operated tool comprising:

• an elongated handle assembly extending along a longitudinal axis of the handle assembly;
• a head assembly coupled to the handle assembly, the head assembly including a frame body, a drive train and a cutting blade assembly, including a cutting blade rotatably driven by the drive train about a cutting blade axis of rotation;
• the drive train comprising:
• a worm screw driveshaft rotating about a longitudinal drive shaft assembly axis of rotation, the worm screw driveshaft having a proximal end and a distal end;
• a worm screw rotating with the worm screw driveshaft, the worm screw positioned intermediate the proximal and distal ends of the worm screw driveshaft;
• a blade driveshaft including a first end and a second end and rotating about the cutting blade axis of rotation, the cutting blade coupled to and rotating with the blade driveshaft;
• a worm gear rotating with the blade driveshaft, the worm screw and worm gear operatively coupled such that rotation of the worm screw driveshaft about the longitudinal drive shaft assembly axis of rotation causes rotation of the blade driveshaft, the worm gear and cutting blade about the cutting blade axis of rotation;
• the frame body including a first side wall and a second side wall spaced apart by a front wall and a back wall, a through bore extending along a frame body longitudinal axis and a transversely extending recess extending into the first side wall in a direction toward the second side wall and opening into the through bore;
• a worm screw driveshaft support assembly supporting the worm screw driveshaft for rotation about the longitudinal drive shaft assembly axis of rotation and including a first bearing support engaging at least a portion of the worm screw driveshaft extending between the distal end of the worm screw driveshaft and the worm screw and a second bearing support and engaging at least a portion of the worm screw driveshaft extending between the proximal end of the worm screw driveshaft and the worm screw, wherein the through bore extends between the front and back walls and includes a cylindrical seating surface spaced from the front wall and the back wall and the second bearing support of the worm screw driveshaft support assembly is seated on the cylindrical seating surface of the through bore;
• and
• a blade driveshaft support assembly supporting the blade driveshaft for rotation about the cutting blade axis of rotation.