Claims
- 1. An edger having a main frame, at least one 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 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;
- shafts supporting said driving pulley and said 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 the shaft of said pulley to be driven;
- a spring for urging said rod in a direction in which the distance between the shafts of said two pulleys is elongated; and
- a clutch means comprising a driving-side pulley cover and a driven-side pulley cover, wherein said clutch means is engaged/released by changing the distance between the shafts of said two pulleys by swinging said swing arm, the distance between said driven-side pulley cover and said pulley to be driven having a small value so as to induce contact between said pulley to be driven and said driving belt at the time of clutch release, and belt inlet and outlet portions of said driving-side pulley cover being shaped and arranged to be closer to said driving belt when under tension than the intermediate portion of said driving-side pulley cover so as to release said driving pulley and said driving belt, the shape of said driven-side pulley cover being such that the distance from said back side of said belt becomes a minimum distance in a range of substantially 90.degree. from a belt-holding starting point of said pulley to be driven toward the rotational direction in a range of 45.degree., the distance between the residual driven-side pulley cover portion and said back side of said belt being arranged to be larger than said minimum distance, and each of a belt inlet portion and a belt outlet portion of said driven-side pulley cover being arranged parallel to said driving belt or to flare away from said driving belt.
- 2. An edger according to claim 1, wherein an end portion of said driving side pulley cover is disposed in the vicinity of the backside of said belt on the tangent line of said belt adjacent to said belt inlet portion and said belt outlet portion of said driving pulley, and the distance between said driving pulley cover portion except for said end portion and said driving pulley is arranged to be substantially larger than the distance between said end portion and said driving belt so that a belt holding space is secured and said two end portions are brought into contact with said driving belt at the time of clutch release.
- 3. 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;
- shafts supporting said driving pulley and said 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 spring for urging said rod in a direction in which the distance between the shafts of said two pulleys is elongated; and
- a clutch means comprising a belt pulley cover which includes a driven-side pulley cover, wherein said clutch means is engaged/released by changing the distance between the shafts of said two pulleys by swing said swing arm, and means for sliding and pushing said driving belt to the side surface of a pulley groove of said pulley to be driven when said belt is loosened, said means for sliding and pushing said driving belt comprises a slant portion formed in a belt outlet and/or inlet portion of said driven-side pulley cover.
- 4. An edger according to claim 1 wherein at least one of said belt inlet portion and outlet portion of said driven-side pulley cover flares away from said belt.
Priority Claims (4)
Number |
Date |
Country |
Kind |
1-55970[U] |
May 1989 |
JPX |
|
1-58022 |
May 1989 |
JPX |
|
1-128554 |
May 1989 |
JPX |
|
1-75824[U]JPX |
Jun 1989 |
JPX |
|
Parent Case Info
This application is a divisional of application Ser. No. 07/522,923, filed May 14, 1990.
US Referenced Citations (10)
Foreign Referenced Citations (4)
Number |
Date |
Country |
62-99937 |
Jun 1987 |
JPX |
62-164729 |
Oct 1987 |
JPX |
62-236406 |
Oct 1987 |
JPX |
63-28322 |
Feb 1988 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
522923 |
May 1990 |
|