Abstract: A transmission for a trimmer/mower can be easily mounted onto a bearing housing of a trimmer/mower. The trimmer/mower has a vertically extending drive shaft and the transmission has a worm gear drive assembly that is drivingly connected to the drive shaft to provide an output shaft extending substantially horizontally. The worm gear drive assembly enables speed reduction and torque conversion that increases the speed of rotation and torque of the output shaft as compared with that of the input shaft. Attachments to be used on the trimmer/mower that operate in a substantially vertical plane can be mounted on the output shaft. Further, existing trimmer/mower can be retrofit with a bearing housing to which the transmission can be quickly and easily mounted. The mounting of the transmission onto the bearing housing can be accomplished without the need for tools by providing a twist-on mounting arrangement with a rotation prevention lock having a simple construction.

Abstract: A trimmer head assembly of a string trimmer mower apparatus has a stack of plates with a ground engaging member on one end of the stack. At the other end, the stack of plates is fastened to a rotating shaft that is driven in rotation by the motor or engine of the trimmer/mower. The plates of the stack have line retaining devices to which one or more lengths of cutting line are secured. Each plate is of a sufficient thickness to spread the respective line retaining devices axially or vertically apart from one another in suitable increments for providing cutting height adjustment selectively by securing a cutting line at the appropriate height. The line retaining devices enable the cutting line to be secured without tools and without disassembly of the trimmer head. Further, the line does not need to be clamped in place to ensure that it remains secured during high speed rotation of the trimmer head.

Abstract: A transmission for a trimmer/mower can be easily mounted onto a bearing housing of a trimmer/mower. The trimmer/mower has a vertically extending drive shaft and the transmission has a worm gear drive assembly that is drivingly connected to the drive shaft to provide an output shaft extending substantially horizontally. The worm gear drive assembly enables speed reduction and torque conversion that increases the speed of rotation and torque of the output shaft as compared with that of the input shaft. Attachments to be used on the trimmer/mower that operate in a substantially vertical plane can be mounted on the output shaft. Further, existing trimmer/mower can be retrofit with a bearing housing to which the transmission can be quickly and easily mounted. The mounting of the transmission onto the bearing housing can be accomplished without the need for tools by providing a twist-on mounting arrangement with a rotation prevention lock having a simple construction.