Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1994-03-23
1995-05-30
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
Capture device
7386444, G01N 104
Patent
active
054192110
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for taking soil samples, according to the generic clause of claim 1.
Overfertilizing of the soil of areas in agricultural use and the associated pollution of waters has increasingly been a subject of public concern recently. Agricultural operations are increasingly adopting the practice of regular soil testing. By analysis for nutrients and alternation of products of cultivation, fertilizing can be optimized and soil exhaustion prevented. It can be ascertained whether the texture of the soil is intact, whether the soil is well aerated, and whether the soil contains an adequate proportion of humus.
Hitherto, samples have been taken by means of probes driven into the ground and then removed, bringing along the section of soil enclosed by the probe.
Probes employed heretofore, as known for example from German Letters of Disclosure 2,545,851, have a tubular jacket bearing a replaceable tip at its foot end segment. The receiving space formed by the tubular jacket is closable towards the tip of the probe by a closure flap, whereby the body of the sample is automatically enclosable in the probe when the probe is extracted. With the use of such probes, however, it has been found that in the case of highly viscous soils, the closure flap must be prestressed with a very heavy spring load in order to hold the body of the sample dependably inside the probe. This heavy spring load, of course, involves the danger that the soil sample may be damaged or its structure affected by the closure flap. With the use of a receptacle arranged coaxially in the tubular jacket to accommodate the body of the sample, the bearing of the closure flap must be passed through the receptacle, substantially augmenting the outlay for the engineering and fabrication of a probe.
SUMMARY OF THE INVENTION
The object of the invention is to perfect the generic soil sampling device so that, while reducing the mechanical outlay, a rapid sampling free from mixture is ensured.
By virtue of the spring wires projecting inward into the receiving space, the soil sample is dependably retained inside the probe when extracted, without alteration in the structure of the sample. According to the invention, the tubular jacket itself may be used as a receptacle to hold the body of the sample, the tip and the manipulating means being removed and the jacket closed by means of suitable closure caps.
In use of the device according to the invention in conjunction with a "handling" device, it is advantageous, in terms of simple construction, if the tip makes a flush connection with the tube jacket while advantageously, a receptacle to receive the body of the sample is provided in the interior of the tubular jacket.
In the case of manual boring rods a stable connection between tip and tubular jacket, and a double-cone-shaped construction of the jacket of the tip facilitates extraction of the probe from the soil.
By setting the cutting edge at various angles to the centerline of the probe, the tip of the probe can he adapted to different states of the soil,
Venting the volume portion of the sample hole located below the tip of the probe by way of a recess made in the probe, the formation of a vacuum when the probe is extracted is prevented, and the forces required for extraction therefore substantially reduced. Such recesses are simple to clean, so that they are effective even for soils with high adhesion to the probe material.
The body of the sample is protected from consolidation or compression by interactions with the neighboring peripheral surfaces of the tubular jacket.
The non-return means is attached in the passage through the tip, and serves in turn for axial support of the tubular jacket. By this measure, the probe can he adapted in simple manner to different states of the soil by interchanging the non-return means.
Advantageously, two receptacles are arranged immediately adjacent to each other in the probe in the form of sleeves of predetermined length. By virtue of this refinement, by driving the
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Din 19672 B1.1, Apr., 1968, Deutsche Normen, "Bodenentnahmegerate fur den Landeskulturbau".
Din 19672 B1.2, Apr., 1968, Deutsche Normen, "Bodenentnahmegerate fur den Landeskulturbau".
Rodel Gerhard
Schurig Manfred
Georg Fritzmaier GmbH & Co.
Raevis Robert
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