초록 ▼

A portable lawn and brush trimmer including an elongated tubular boom arm, motor assembly mounted at one end of the boom, a trimmer head mounted on the opposite ends of the boom arm, and two adjustment mechanisms, which allow the attitude of the trimmer head to be adjusted about two different axis i

A portable lawn and brush trimmer including an elongated tubular boom arm, motor assembly mounted at one end of the boom, a trimmer head mounted on the opposite ends of the boom arm, and two adjustment mechanisms, which allow the attitude of the trimmer head to be adjusted about two different axis in relation to the boom arm is disclosed. The adjustment mechanisms allow an operator to manually change the attitude and orientation of the trimmer's cutting plane to conform to the slope and contour of the terrain without the operator altering the natural balanced operating position of the trimmer or his body posture while maintaining the natural balanced orientation of the boom arm with respect to the operator and not the terrain being worked. One adjustment mechanism (pivot adjustment) allows the trimmer head to pivot in relationship to the boom arm between a number of manually selectable angular positions. Another adjustment mechanism (swivel adjustment) allows the trimmer head to swivel 360.degree. about the longitudinal axis of the trimmer head's neck and lock into one of several fixed positions.

대표청구항 ▼

[ I claim:] [1.]1. An improvement in a portable lawn and brush trimmer, which includes an elongated tubular boom arm having a proximal end and a distal end, a trimmer head mounted to the distal end of the boom arm, a rotating cutting means extending from the trimmer head, a motor means mounted to th

[ I claim:] [1.]1. An improvement in a portable lawn and brush trimmer, which includes an elongated tubular boom arm having a proximal end and a distal end, a trimmer head mounted to the distal end of the boom arm, a rotating cutting means extending from the trimmer head, a motor means mounted to the proximal end of the boom arm, and a drive shaft rotatably disposed within the boom arm between the motor means and the trimmer head for transferring rotational motion from the motor means to the cutting means, the improvement comprising:the drive shaft includes a first segment connected to the motor means and a second segment connected to the trimmer head;pivot means mounted to the boom arm and the trimmer head for pivoting the trimmer head angularly with respect to the boom arm;shaft coupling means disposed within the pivot means and operatively coupled to the first segment and the second segment for allowing the first segment and the second segment limited angular movement with respect to each other while transmitting rotary movement between the first segment and the second segment;pivot positioning means mounted to the boom arm and connected to the pivot means for selectively securing the trimmer head between a plurality of discrete pivotal adjustment positions; andswivel means mounted to the pivot means and the trimmer head for rotating the trimmer head axially about the axis of the second segment between an additional plurality of adjustment positions to adjust the orientation of the cutting means. [7.]7. A lawn and brush trimmer for cutting foliage comprising:an elongated tubular boom arm;a trimmer head mounted to the distal end of the boom arm and having a rotating cutting means;motor means mounted to the proximal end of the boom arm;an elongated drive shaft rotatably disposed longitudinally within the boom arm for transferring rotational motion from the motor means to the cutting means, the drive shaft having a first segment connected to the motor means and a second segment connected to the trimmer head;pivot means mounted to the boom arm and trimmer head for pivoting the trimmer head angularly with respect to the boom arm;shaft coupling means disposed within the pivot means and operatively coupled to the first segment and the second segment for allowing the first segment and the second segment limited angular movement with respect to each other while transmitting rotary movement between the first segment and second segment;pivot positioning means mounted to the boom arm and connected to the pivot means for selectively securing the trimmer head between a plurality of discrete pivotal adjustment positions to selectively change the orientation of the cutting means with respect to the boom arm, whereby the orientation of the cutting plane of the trimmer head with respect to the longitudinal axis of the boom arm can be selectively changed to permit the trimmer to be operated over un-level terrain while maintaining the natural balanced attitude of the trimmer with respect to the operator; andswivel means mounted to the pivot means and the trimmer head for rotating the trimmer head axially about the second segment for selectably positioning the trimmer head between a plurality of discrete radial adjustment positions about the second segment.