| 摘要 |
A soil sampling apparatus provides a drive shoe that is threadedly carried by the soil sampling tube. The drive shoe provides a hollow cylindrical body defining an internal flange extending radially inwardly. A pin point slides within the drive shoe and sample tube in the unlocked mode, when the soil sample is being taken, and is fixedly attached to the drive shoe in the locked mode, when the drive rod and attached soil sampling apparatus is driven to the depth where the soil sample is to be taken. Three collets are radially distributed about a wide neck portion of the pin point, and are supported by a shoulder portion of the pin point. Downward force on the drive rod results in downward movement of the drive shoe, causing the internal flange to push down on the collets, which in turn push down on a shoulder portion of the pin point, pushing the pin point deeper into the ground. To unlock the pin point at the desired depth, the drive rod is raised a couple inches and a rod is dropped through the drive rod, striking the top of the pin point, causing the collets to be moved radially inwardly against a narrow neck portion of the pin point, and out of contact with the flange of the drive shoe. Once the pin point is unlocked, downward force on the sampling tube causes the pin point to be raised upwardly, through the sampling tube, as the soil sample sample fills the tube.
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