Title:
【発明の名称】射出体運転装置
Document Type and Number:
Japanese Patent JPH0650033
Kind Code:
B2
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 (12) is attached to an oscillating hammer (14) by a resilient spring-mass-spring connection (10, 14, 11) 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 (15), 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 (25, 30-42) which, as core samples are taken, simultaneously give an output indicating the resistance of the ground to penetration by the projectile.
Inventors:
Albert Alexander Logicer
Application Number:
JP23402484A
Publication Date:
June 29, 1994
Filing Date:
November 05, 1984
Export Citation:
Assignee:
British Technology Group Limited
International Classes:
E21B25/04; E02D1/02; E21B1/02; E21B7/24; E21B25/00; E21B49/00; E21B49/02; (IPC1-7): E21B49/02; E21B25/00
Domestic Patent References:
| JP5114403Y1 |
Other References:
【文献】米国特許3394766(US,A)
Attorney, Agent or Firm:
Aoyama Ryo (2 outside people)
Next Patent: キートツプの取り付け構造