Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 7021867 | Method and machine for dynamic ground compaction At least one cable is attached to a load lying on the ground via a releasable connection mechanism. A traction force is applied to the cable to hoist the load up to a prescribed height. That traction force is then eliminated or reduced to initiate a downward movemen... | 04/04/2006 |
| 4660655 | Pile-driving apparatus and method of operating such apparatus Pile-driving apparatus comprises a drop hammer for imparting blows; a winch for lifting the drop hammer between successive blows, the winch comprising a winch drive, a winch drum, a clutch for disengageably engaging the winch drive with the winch drum, an... | 04/28/1987 |
| 4580765 | Compaction machine The invention relates to a machine for dropping heavy weights on the ground for carrying out processes of dynamic compaction or dynamic consolidation wherein a brake is provided on the hoist drum which can be actuated automatically after a given period of... | 04/08/1986 |
| 4137974 | Hydraulically driven kelly crowd A vertical drill rig is provided with a hydraulic crowd mechanism for crowding down a drive kelly having a rotating drilling tool supported from the lower end thereof. The crowd mechanism includes a drum having first and second cables wound in opposite se... | 02/06/1979 |
| 4002211 | Cable operated apparatus for forming piles Method and apparatus for forming piles in the earth with a pile hammer rig having a hoisting drum carried by a crane, driving and braking apparatus for the drum, a drop-weight, a hoisting rope leading from the drum for lifting the drop-weight, apparatus f... | 01/11/1977 |
| 3938595 | Apparatus and method for driving bulb piles Method and apparatus for forming piles in the earth with a pile hammer rig having a crane, a hoisting drum carried by the crane, a driving mechanism for driving the drum through a clutch assembly, a braking assembly for the drum, a hoisting rope leading f... | 02/17/1976 |
