FIELD: rock testing in wells. SUBSTANCE: when retainer 13 is engaged, weight under action of spring 8 reciprocates and loads punch 4 through weight 11, bar 5 and wheel 9. For alternating loading of punches, retainers 12 and 13 are changed over in synchronism with motion of weights. During test, when only punch 3 is loaded, retainer 12 is engaged. Weight moves and through bar 5 and wheel 6 loads punch 3. EFFECT: higher efficiency. 1 dwg
| Title | Year | Author | Number |
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| DEVICE FOR FIELD TESTING OF ROCKS | 1992 |
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