Earth working – Lawn aerator or perforator – or plug remover
Patent
1989-01-23
1990-05-08
Johnson, Richard J.
Earth working
Lawn aerator or perforator, or plug remover
172 42, 172429, 172243, 172 76, 56 172, A01B 4502, A01B 3302
Patent
active
049230166
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is concerned with the field of mechanized garden cultivation and its object is a scarifier, moss rake and lawn or grass aerator device.
Various small devices are known which are intended mainly for lawn maintenance and which carry tools in the form of blades rotating in a vertical plane and disposed along a motor driven shaft. A first type of device comprises a frame in the form of a box open at its bottom face and supporting a motor on its top face, which forms a cover; one or more shafts supporting the blades is or are disposed inside the box; this shaft is in turn supported by bearings on the box and is driven by the motor with the aid of a chain drive, for example; the box is provided with side wheels or rollers. In a device of this kind the depth of cut is adjustable by regulating either the height of the shaft relative to the wheels or the height of the wheels relative to the box. Devices of this kind are practical, but they have the disadvantage of being dedicated to one particular type of work.
Small devices of the motorized rake type are also known, in which the drive half-shafts project at the side of a motor casing and are adapted to receive either wheels, when the device is to be used as traction means, or rotary tools. To enable the device to be used as a scarifier, equipments have thus been proposed which consist of a pair of shafts adapted to be connected by sleeve couplings to the drive half-shafts at one end, while their other end is provided with a wheel hub and a wheel adapted to turn freely about the hub; each shaft carries a plurality of scarifier blades; the coupled end is fastened to the drive half-shaft by means of a pin; the rotation of the motor rotates the blades, while the rotation of the wheels, that is to say the propulsion of the device, is dependent solely on the operator. The advantage of a device of this kind is its ability to be used for various types of work, but a disadvantage is that the depth of cut into the ground is dependent on the diameter of the wheels, and is therefore not adjustable for a given equipment.
For more precise information regarding the prior art reference may be made to the following publications: U.S.-A-No. 4,483,400 (ARNDT), U.S.-A-No. 3,127,940 (HUTCHINSON), U.S.-A-No. 2,794,308 (CAVANAUG), FR-A-1,376,521 (BRIBAN) and FR-A-690,298 (KOROUM).
SUMMARY
The present invention relates to a device for equipping small mechanized cultivation motors, which is of the second type described above and which is detachable in order to permit the multipurpose use of the motor and enables the depth of cut to be adjusted.
According to the present invention, a cultivation device of the so-called "scarifier" type cuts into the ground with the aid of tools in the form of blades rotating in a vertical plane about the common axis of a pair of tool carrier shafts. Each of these shafts is supported at a first end by a drive half-shaft of a small drive unit of the "motorized hoe" type and is connected to free rotation to a bearing supported by a longitudinal member equipped with wheels or rollers at each end.
The device preferably incorporates means for the adjustment of the height of said bearing above the longitudinal member, in such a member as to regulate the depth of cut into the ground. Despite this adjustability of the depth of cut, the longitudinal members are connected together only by means of the tool carrier shafts.
In a preferred form of construction of the device according to the invention the connection between the bearing and the longitudinal member is made by a pair of slides fastened to the bearing and provided with cavities whose axes are substantially vertical, and by a pair of pillars fastened to the longitudinal members and shaped to slide in said slides. In this embodiment at least one of the slides and the corresponding pillar are provided with means for securing them in their relative positions. The securing means enables the adjustment of the height of the bearing above the longitudinal members.
REFERENCES:
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patent: 2977740 (1961-04-01), King
patent: 3127940 (1964-04-01), Hutchinson
patent: 4028868 (1977-06-01), Zehrung
patent: 4336760 (1982-06-01), Cohen
patent: 4483400 (1984-11-01), Arndt
patent: 4503630 (1985-03-01), Riley
patent: 4802536 (1989-02-01), O'Neal
Brogan Marilyn
Forges des Margerides S.A.
Johnson Richard J.
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