Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1992-11-25
1994-08-16
Britts, Ramon S.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
56370, 56366, A01D 7810
Patent
active
053375467
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to apparatus for making hay; i.e. for raking or tedding hay. For the purposes of this specification `hay` includes straw and other fibrous crops.
DISCUSSION OF THE PRIOR ART
Hay raking and tedding machines have been known for many years. Nowadays the majority of such machines comprise rotors which revolve about rotational axes which in use are vertical or nearly vertical. Each rotor is provided with a number of tynes which project outwardly from a tyne-carrying structure which is connected to a drive mechanism coupled to the power take off (PTO) of a tractor to which the machine is hitched. In nearly all commercially available such machines the tyne-carrying structure comprises a rigid assembly of steel components. It is essential that the tynes are mounted so that they can deflect when they encounter obstacles in use. Tyne failure is probably the most common cause of downtime for all hay making machines.
In many cases the tyne is made of spring steel which is wound into a coil at the base of the shank of the tyne so that the tyne itself can yield when it strikes an obstacle. The tynes are bolted or otherwise fixed to the tyne-carrying structure. In other cases the tyne is rigid but is fixed on a mounting which itself is provided with a spring. The mounting thus yields when the tyne strikes an obstacle. Tynes of both such types are expensive and, despite their construction, they are still prone to be damaged. Moreover replacement thereof is a relatively laborious operation. This is an important factor considering that all hay making machines are provided with a large number of tynes.
In other cases the tyne is not rigid, being constructed of, for example, flexible steel cable or belting. A disadvantage of such tynes is that they have a limited service life. Tynes made of belting or other nonmetallic material wear out quickly in service. On the other hand tynes made of steel cables would probably be subject to metal fatigue, besides being expensive.
Examples of the tyne constructions discussed above are disclosed in New Zealand patent specifications #175663, 163085, 159850, 186612, 165156 160385, 186537, 193122, 183195, 162462, 170390, 156740, 191248, 182130, 180769, 151543 and 183628.
The first of the above patent specifications (i.e. #175663) discloses a rotor comprising a cylindrical skirt of flexible material which is suspended from various forms of supporting apparatus. The tynes are bolted to the skirt. The applicant is not aware of any commercial use of a machine incorporating a rotor of this type: however, it appears that the supporting apparatus is rather complex and would be costly to make and probably unreliable in use. It is clear from the specification itself of patent #175663 itself that this complexity arises because of the fact that the skirt envisaged is thin and flexible.
A machine incorporating yet another type of rotor is disclosed in New Zealand patent #188590. This rotor comprises a rigid drum provided with a frustoconical rubber skirt provided on its upper face with upstanding rib-like integrally moulded formations which, according to the specification, "favour the entrainment" of fodder. This machine is in commercial use. It has been found to have a number of disadvantages. The skirt is expensive and has a limited working life. It also tends to entrain a lot of dirt since it presents a continuous surface below the said formations. The machine is furthermore suitable only for raking.
SUMMARY OF THE INVENTION
According to the invention there is provided a rotor for a hay making apparatus, the rotor being arranged to carry demountable tynes spaced about its periphery and to be coupled to drive means for rotating the rotor about a rotational axis, characterised in that the rotor comprises a self-supporting rotor body constructed of a resiliently deformable elastomeric material, the rotor body being provided with seats for the tynes and at least one flange-like protuberance located between the seats and the rotational axis.
At least one
REFERENCES:
patent: 3962854 (1976-06-01), van der Lely et al.
patent: 4128987 (1978-12-01), Zweegers
patent: 4367622 (1983-01-01), Aron et al.
M & W Gear Advertisement for M & W Hayfly RV-300 Tedder-Wondrower, Gibson City, Ill., Jan. 1987.
Britts Ramon S.
Lisehora James A.
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