Plant husbandry – Grafting
Patent
1993-08-11
1995-08-29
Raduazo, Henry E.
Plant husbandry
Grafting
A01G 100
Patent
active
054449383
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention pertains to a device for Vee-grafting, especially for hard-and-stone-fruit trees, with an angled knife for cutting a groove in the stock arranged to move in an outer part, formed as a guide space by means of a toggle lever, which is inclined in relation to the axis of the stock.
A prior art device for cutting a notch is described in DE-B-157 072. An angled knife is manually moved with a lever in a frame inclined against the stock such that a notch is cut with an increasing depth. With that device, however, a diametrically opposed wedge on the shaft of the scion cannot be made. As a consequence, such grafting must be made manually, whereby the forming of a notch in the stock and in the diametrically opposed wedge on the end of the scion generally takes a lot of time. In addition, the section planes become easily contaminated, presenting a risk for the grafting operation. It is further disadvantageous that the device cannot be disposed on stocks with arbitrary diameters if the length relative to the depth of the notch in the wooden part should be the same.
It is therefore the object of the invention to provide a grafting device with which the above-mentioned drawbacks can be avoided.
2. Summary of the Invention
According to the invention, this object is attained in that there is an inner part moveable inside the outer part in the forward region or front end of which the knife is fitted. In the rear region there is an aperture for the scion where the outer part has an aperture in its forward region for the stock and in this rear region it has an aperture which can be positioned coincidentally with the aperture in the inner part and it also has an angled knife at the forward edge.
With such a device the above-mentioned object can be attained in an advantageous manner. The process includes the following steps: moving the inner part to its starting position along a direction B to the right-hand side, and moving the inner part consecutively to the left-hand side within the outer part. During that movement in the direction A, the knife disposed at the forward end of the inner part is guided through the aperture in the forward region of the outer part in an inclination angle Alpha against the stock, which projects through this aperture, wherein the aperture and its length and depth is formed by the intersection of the stock with the outer part.
In that way the notch is formed in the stock in a length and depth given by the special construction of the outer part.
In the same or in a second operation, in which the inner part is moved back to its starting position, the scion is led approximately in a counter angle Alpha' to the angle Alpha through the rear apertures of the inner and outer part at the same time and in the same position. During a following movement of the inner part, in direction A, to left-hand side the shaft of the scion is pushed against the knife disposed at the forward edge of the rear aperture in the outer part cutting the wedge on the shaft. The knife of the outer part has the same shape as the knife of the inner part. Therefore, the notch in the stock and the wedge on the shaft of the scion have the same geometry also and can be combined in a close fit.
As these working procedures can be made very shortly one after the other and without a possible contamination of the intersection planes, the success of the grafting cannot be affected by drying out or by insufficient cleanliness during the process.
According to a further advantageous embodiment of the invention, the parts moveable within each other and the knives disposed on them are V-shaped, whereas the knife for cutting the notch in the stock has a smaller aperture angle, preferably about 3 degrees, than the knife for cutting the wedge on the scion shaft so that it can be fitted into the notch by force fit. Preferably the V-edges of the knives are rounded.
When using scions with shaft diameters of 7 to 10 mm it is advantageous if the rear aperture of the inner part has a len
REFERENCES:
patent: 340699 (1886-04-01), Congar
Greenberg Laurence A.
Lerner Herbert L.
Proglas Handelsgesellschaft m.b.H. & Co. KG
Raduazo Henry E.
Stemer Werner H.
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