초록 ▼

An adjustable height cutting head for a string trimmer machine provides for the positive locking in place of the cutting string or line holder portion of the device, relative to a cylindrical central core which secures conventionally to the machine. The central core includes a series of adjustment h

An adjustable height cutting head for a string trimmer machine provides for the positive locking in place of the cutting string or line holder portion of the device, relative to a cylindrical central core which secures conventionally to the machine. The central core includes a series of adjustment holes of different heights through the wall thereof, with the collar of the line holder having a series of holes corresponding to any one of the heights of the adjustment holes in the central core. The height of the line holder disc is quickly and easily positively locked in place at the desired height relative to the central core, by securing a few bolts in the desired position. The present system precludes slippage of the line holder portion relative to the core, and moreover distributes the cutting lines evenly about the periphery of the line holder disc for proper balance of the assembly to preclude vibration and fatigue of the machine and operator. Each of the line attachment clamps is also positively secured in place by a pair of bolts to provide a positive clamping action on each trimmer line to preclude slippage thereof. Yet, the trimmer lines are quickly and easily replaced merely by loosening the two bolts of each clamp, withdrawing the old line, inserting one end of the new line in the clamping channel, pushing the new line through the channel, and tightening the clamp bolts. Complete removal of the bolts and clamp is not required.

대표청구항 ▼

[ I claim:] [1.] An adjustable height head for a string trimmer, comprising:a generally cylindrical central core, for conventionally removably securing to a string trimmer machine;said central core including a plurality of circumferentially disposed rows of height adjustment holes therein, with each

[ I claim:] [1.] An adjustable height head for a string trimmer, comprising:a generally cylindrical central core, for conventionally removably securing to a string trimmer machine;said central core including a plurality of circumferentially disposed rows of height adjustment holes therein, with each of said rows including a plurality of evenly spaced holes therein;a height adjustment plate for adjustably and removably securing to said central core;said plate comprising a locking collar for removably, positively, and adjustably securing to said central core, and a trimmer line attachment disc formed integrally therewith and extending outwardly therefrom;said locking collar including a single circumferential row of attachment holes therethrough, with said locking collar attachment holes selectively aligning with said evenly spaced holes of each of said rows of said height adjustment holes of said central core when said locking collar is installed thereon; andsaid trimmer line attachment disc including at least an upper surface and a periphery with a plurality of trimmer line attachment means disposed therearound.