US Patent: 862,653
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| Rock Drill
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Patentees:
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| Howard A. Pedrick (exact or similar names) - Philadelphia, PA |
| Charles A. Smith (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 10, 1906 |
| Granted: |
Aug. 06, 1907 |
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Joel Havens
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Description: |
| Abstract:
The object of our invention is to construct a rock drill, actuated by the explosion of a gaseous compound, which will withstand the severe racking strains to which a rock drill is subjected. This object we attain by so designing the rock drill that there will be no direct connection between the drill plunger and the other mechanism of the drill, there being always a body of compressible fluid back of the plunger to resist the back lash, thus preventing the destructive jarring or racking other parts.
Claim:
The combination inn rock drill actuated by the explosion of a gaseous mixture, of a cylinder, an automatically actuated piston and a plunger mounted in the cylinder, spindle connected to the plunger, a spring concentrically surrounding said spindle and operatively independent of the piston, said spring being capable of resisting the action of said piston as it compresses the explosive mixture but insufficient. to overcome the force of the explosion of said mixture and menus for cushioning the return stroke of the plunger. |
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