Apparatus for driving testing projectiles

Details Apparatus for driving testing projectiles Apparatus for driving testing projectiles

1984-11-01

1986-06-17

Myracle, Jerry W.

Measuring and testing

Hardness

By penetrator or indentor

7386445, G01N 3324

Patent

active

045948852

ABSTRACT:
Method and apparatus for driving projectiles into the ground to acquire useful information about the soil and underlying strata of the earth. The projectile is attached to an oscillating hammer by a resilient spring-mass-spring connection whereby the hammer exerts a cyclically-varying force upon the projectile either with or without direct contact, change between the non-contact and contact modes taking place automatically in response to changes in ground resistance. A remotely-adjustable resilient stop, for instance in the form of a controllable gas spring, may supplement the spring-mass-spring connection and be operable to vary the characteristics of the connection between the hammer and the projectile during use. Also the projectile may be in the form of a hollow coring tube adapted to take core samples and the apparatus may be equipped with instruments which, as core samples are taken, simultaneously give an output indicating the resistance of the ground to penetration by the projectile.

REFERENCES:
patent: 3004389 (1961-10-01), Muller
patent: 3215209 (1965-11-01), Desvaux et al.
patent: 3498388 (1970-03-01), Jovis
patent: 4061021 (1977-12-01), Baldwin
patent: 4359890 (1982-11-01), Coeius

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