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Class Information
Number: 175/296
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Fluid-operated
Description: Apparatus in which (1) the hammer or impact device is acted upon and propelled by a body of fluid to deliver a blow (2) a body of fluid acts directly upon the hammer or impact device, or on holding means therefor to restrain said device against movement, and means to relieve the device or holding means from the influence of the restraining fluid to deliver a blow or (3) a means for holding the hammer or impact device against movement is released by a body of fluid to deliver a blow.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4660658 |
Hydraulic down-the-hole rock drill |
Apr. 28, 1987 |
| 4653593 |
Control method and control device for a down-the-hole rock drill |
Mar. 31, 1987 |
| 4618007 |
Impact-action self-propelled mechanism for driving holes in the earth |
Oct. 21, 1986 |
| 4596292 |
Subsoil penetrating apparatus |
Jun. 24, 1986 |
| 4591004 |
Pneumatic percussion machine |
May. 27, 1986 |
| 4569412 |
Seismic source |
Feb. 11, 1986 |
| 4545444 |
Jar mechanism energizer |
Oct. 8, 1985 |
| 4537265 |
Self propelled reversible boring ram |
Aug. 27, 1985 |
| 4518051 |
Percussion actuated core sampler |
May. 21, 1985 |
| 4462471 |
Bidirectional fluid operated vibratory jar |
Jul. 31, 1984 |
| 4303138 |
Earth drilling lubricated hydraulic shock absorber and method |
Dec. 1, 1981 |
| 4241797 |
Impact tool for dislodging stuck drill bits |
Dec. 30, 1980 |
| 4200158 |
Fluid retarded accelerating jar with negative and positive pressure chambers |
Apr. 29, 1980 |
| 3946819 |
Well tool and method of use therefor |
Mar. 30, 1976 |
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