Earth working – With drive means for tool or cleaner – Attendant supported tool
Patent
1988-07-15
1990-03-27
Johnson, Richard J.
Earth working
With drive means for tool or cleaner
Attendant supported tool
56 175, 56 127, 56255, 172111, A01B 106, A01B 3908, A01B 3308
Patent
active
049112473
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a handheld power cultivating device.
Such cultivating tools are known (West German Gebrauchsmuster No. 85 26 702) and are used for cultivation in nurseries, small plants, vineyards and the like.
A problem with these known devices is the high rotational speed of the drive motors which cause the actual working implement such as, for example, a hoeing disc, to likewise have a high rotational speed. Such high rotational speeds are not desired in practice.
Attempts to equip the drive motor with a reduction gear have been unsuccessful until now. Thus, the reduction gear in the vicinity of the drive motor results in an unfavorable weight shift of the working implement and, in addition, the rotational moment of the shaft is very large so that it is difficult to stabilize and guide the shaft.
An object of the invention is to provide a handheld cultivating device which is equipped with a reduction gear in such a manner that the handling characteristics of the device are not adversely affected by installation of the reduction gear. The reduction gear is to be easily interchangeable and capable of being incorporated in the structure of the working head.
The invention proposes a handheld cultivating device equipped with a protective tube which is attached to the drive motor from below and guides the drive shaft. A reduction gear can be pushed onto this protective tube and, a shaft connection between the drive shaft and the working implement can thereby be established. Since the reduction gear is arranged at the lower end of the motor shaft, a small rotational moment is generated on the motor shaft and a large rotational moment on the working head so that the effect of the working implement is improved and shaft guidance is simplified.
The reduction gear can simultaneously function as a protective housing for the actual working implement such as, for example, a cultivating disc.
In a known handheld cultivating device, the tool carrier is in the form of an arched, convex disc body having a carrier surface which faces the ground and supports teeth serving as cultivating tools. The teeth are of triangular cross section, taper towards their free ends and are inclined opposite to the direction of rotation of the tool carrier. On the upper side, a protective cap is movably held on the supporting or guiding shaft which supports the tool carrier. Loosened soil and weeds can enter the interior of the protective cap through a gap which is located between the upper side of the tool carrier and the lower edge of the protective cap and enlarges as the cap moves upwards. In this situation, which already occurs after a relatively short operating period, the rotating tool carrier becomes loaded to a significant degree. The device then becomes difficult to manipulate and, in addition, the ground can no longer be adequately cultivated due to an impeded flow of soil as well as a reduced output of the tool carrier. Thus, the device must be stopped after relatively short operating periods in order to free the tool carrier and the cap from material which has penetrated. Furthermore, during operation, weeds wind onto the inclined teeth of the known device which taper in the direction of rotation. This makes additional cleaning work necessary. Overall, the known device is extremely difficult to guide manually, and accordingly difficult to manipulate, when the tool carrier becomes loaded during operation.
Another object of the present invention is to provide a cultivating device of the type outlined above which, easily and with substantially no maintenance, allows the ground to be effectively and carefully cultivated with simultaneous destruction of weeds.
To achieve this object, the cultivating device in accordance with the invention is characterized in that the tool carrier is laterally surrounded by an impact body and that passages opening to the outside are provided between the impact body and the tool carrier. By virtue of the free passages formed between the impact body and the tool carrier, loosened soil and comm
REFERENCES:
patent: 2531577 (1950-11-01), Dayton
patent: 2888084 (1959-05-01), Trecker
patent: 2897902 (1959-08-01), Emmons
patent: 3781991 (1974-01-01), Stretton
patent: 4213504 (1980-07-01), Schneider
patent: 4293041 (1981-10-01), Holmstadt
patent: 4364435 (1982-12-01), Tuggle
Kuhlmann Josef
Scheipers Gerd
Johnson Richard J.
Kontler Peter K.
Kuhlmann Josef
Schuer Karl
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