초록 ▼

A transmission assembly for a string trimmer is disclosed. The transmission assembly comprises a liner that includes a sleeve. The sleeve includes an inner surface that defines a passageway for a rotatable core, and the sleeve further includes an outer surface. The liner further includes a plurality

A transmission assembly for a string trimmer is disclosed. The transmission assembly comprises a liner that includes a sleeve. The sleeve includes an inner surface that defines a passageway for a rotatable core, and the sleeve further includes an outer surface. The liner further includes a plurality of legs that project from the outer surface, and a retainer projection disposed at a position axially adjacent to the plurality of legs. The transmission assembly further comprises a retainer that is held to the liner by the retainer projection. The retainer is configured to axially and radially restrain the liner relative to an outer down-tube.

대표청구항 ▼

1. A transmission assembly for a string trimmer, comprising: a liner, including: a sleeve including an inner surface defining a passageway adapted to receive a rotatable core, and the sleeve further including an outer surface; a plurality of legs projecting from the outer surface; a retainer project

1. A transmission assembly for a string trimmer, comprising: a liner, including: a sleeve including an inner surface defining a passageway adapted to receive a rotatable core, and the sleeve further including an outer surface; a plurality of legs projecting from the outer surface; a retainer projection disposed at a position axially adjacent to the plurality of legs; and a retainer held to the liner by the retainer projection, and the retainer being configured to axially and radially restrain the liner relative to an outer down-tube, wherein the retainer projection includes at least one projecting key, and the retainer includes at least one slot that accommodates the at least one projecting key to rotatably restrain the retainer relative to the liner. 2. The transmission assembly of claim 1, wherein the retainer projection includes an ultrasonically welded portion that axially restrains the retainer relative to the liner. 3. The transmission assembly of claim 1, wherein each of the plurality of legs has an elliptical shape as viewed in a direction of a longitudinal axis of the liner. 4. The transmission assembly of claim 1, wherein each of the plurality of legs defines a helical path along a length of the liner. 5. The transmission assembly of claim 1, further comprising a flexible and rotatable core within the passageway. 6. The transmission assembly of claim 5, further comprising an outer down-tube defining a passageway in which the liner, the retainer, and the rotatable core are disposed. 7. A string trimmer comprising the transmission assembly of claim 6, and the string trimmer further comprising: a power source connected to a first end of the rotatable core and configured to rotate the core; and a rotary whip assembly connected to a second end of the rotatable core opposite the first end. 8. The string trimmer of claim 7, wherein the retainer engages a lower end of the outer down-tube proximate the second end of the rotatable core. 9. A transmission assembly for a string trimmer, comprising: a liner, including: a sleeve including an inner surface defining a passageway adapted to receive a rotatable core, and the sleeve further including an outer surface; a plurality of legs projecting from the outer surface; a retainer projection disposed at a position axially adjacent to the plurality of legs; and a retainer held to the liner by the retainer projection, and the retainer being configured to axially and radially restrain the liner relative to an outer down-tube, wherein the retainer includes a concave surface. 10. The transmission assembly of claim 9, wherein the retainer extends further radially outwardly than the plurality of legs. 11. A transmission assembly for a string trimmer, comprising: a liner, including: a sleeve including an inner surface defining a passageway for a rotatable core, and the sleeve further including an outer surface opposite the inner surface; a plurality of legs projecting from the outer surface; a retainer projection defined by the sleeve at an end of the sleeve; and a retainer axially restrained relative to the liner by the retainer projection, the retainer including a plurality of fingers configured to engage an outer down-tube and axially and radially restrain the liner relative to the outer down-tube. 12. The transmission assembly of claim 11, wherein the retainer includes a concave surface. 13. The transmission assembly of claim 11, wherein the retainer is a spring washer. 14. The transmission assembly of claim 11, wherein the retainer projection includes at least one projecting key, and the retainer includes at least one slot that accommodates the at least one projecting key to rotatably restrain the retainer relative to the liner. 15. A method of forming a transmission assembly for a string trimmer, comprising the steps of: providing a liner including: a sleeve including an inner surface defining a passageway adapted to receive a rotatable core and an outer surface opposite the inner surface; a plurality of legs projecting from the outer surface; a retainer projection disposed at a position axially adjacent to the plurality of legs; and securing a retainer to the liner using the retainer projection, the retainer being configured to axially and radially restrain the liner relative to an outer down-tube, wherein the retainer projection includes at least one projecting key, and the retainer includes at least one slot that accommodates the at least one projecting key to rotatably restrain the retainer relative to the liner. 16. The method of claim 15, wherein the liner is formed by an extrusion process. 17. The method of claim 15, wherein the retainer projection is formed by a skiving process. 18. The method of claim 15, wherein the retainer projection is deformed to secure the retainer to the liner. 19. The method of claim 18, wherein the retainer projection is deformed using an ultrasonic welding process. 20. The method of claim 15, further comprising the step of positioning the retainer in a lower end of an outer down-tube configured to connect to a rotary whip assembly of a string trimmer.