Hirata, Makizo; Ohama, Shigeharu; Nishimura, Michio;

Edger

An edger having a main frame, at least one front wheel fastened in the front portion of the main frame, two rear wheels fastened in the rear portion of the main frame, a rotary blade disposed in the front portion of either side of the main frame and capable of conducting edging, an engine mounted on the main frame and a driving device for operating the rotary blade with the engine, the edger comprising: a supporting arm for supporting the rear wheel positioned opposite to the rotary blade in such a manner that the position of the rear wheel positioned opposite to the rotary blade can be vertically adjusted with respect to the main frame; and a positioning mechanism for positioning the vertical position of the rear wheel disposed between the main frame and the supporting arm.

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What is claimed is:

1. An edger having a main frame, at least one front wheel fastened in the front portion of said main frame, two rear wheels fastened in the rear portion of said main frame, a rotary blade disposed in the front portion on either side of said main frame and capable of conducting edging, an engine mounted on said main frame and a driving device for operating said rotary blade with said engine, said driving device comprising:

a driving pulley;

a pulley to be driven;

a driving belt arranged between said two pulleys;

a swing arm having the center of its swinging motion at a position different from the center of rotation of said driving pulley;

a rod slidably supported by said swing arm and supporting said pulley to be driven;

a tension spring for urging said rod in a direction in which the distance between the shafts of said two pulleys is elongated;

a control rod connected to said swing arm for the purpose of controlling the height of said pulley to be driven and clutch engagement;

a clutch lever disposed in a frame handle and connected to said control rod; and

a return spring for urging said swing arm to a clutch disengagement state, wherein said return spring intersects a vertical plane containing a rotational axis of said driving pulley at a location beneath said rotational axis.

2. An edger according to claim 1 wherein clutch engagement and disengagement results from changing the distance between the driving pulley and the pulley to be driven to engage and disengage, respectively, said driving belt.

3. An edger according to claim 1 wherein at least a portion of said return spring is disposed between said driving pulley and said engine.