Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 7237621 | Driving device A driving unit comprises a pneumatic head for being combined to a pneumatic tool; a front end of the pneumatic head being installed with a push rod; a driving unit having a slender driving rod at a front end thereof; the push rod serving to push the driving unit; an... | 07/03/2007 |
| 7073610 | Downhole tool A downhole tool for generating a longitudinal mechanical load. In one embodiment, a downhole hammer is disclosed which is activated by applying a load on the hammer and supplying pressurizing fluid to the hammer. The hammer includes a shuttle valve and piston that a... | 07/11/2006 |
| 7036608 | Apparatus for producing self-exciting hammer action, and rotary power tool incorporating such apparatus An apparatus for providing percussion action in a rotary power tool having a rotary output shaft, the apparatus comprising at least one moveable mass adapted to have a component of movement parallel to the axis of the rotary output shaft to cause impacts to be appli... | 05/02/2006 |
| 6843329 | Rotary percussion device for a drill column The inventive rotary percussion device (1) used for driving at least one drill column (2) disposes of a percussion device (6) and a rotary device (5) and of an insertion end (3), which is rotatably mounted in a device body (8) and which has an axial boring, in which... | 01/18/2005 |
| 5806609 | Manually operable tool for drilling and/or removing material in brittle and/or low ductile material A manually operable tool, such as a hammer drill, for drilling and/or removing material in at least one of brittle material and low ductile material, has a continuously rotatable chuck (8) and a motor driven striking mechanism (1) for transmitting impulse... | 09/15/1998 |
| 5769172 | Power tool A bi-directional power tool for driving fasteners and for drilling purposes. The power tool comprises a rotary piston driving mechanism and a linear sliding member that transform a longitudinal motion of a piston in a cylinder to a rotation movement of a ... | 06/23/1998 |
| 5350025 | Nonrotary piston for jackhammer and removable splined nut therefor A fluid-activated, percussive impact tool has a piston therein that reciprocates longitudinally but not rotationally. The piston activates a wrap spring clutch to rotate the drill steel. A removable splined nut in combination with the tool's housing restr... | 09/27/1994 |
| 5322136 | Air percussion drilling assembly An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom ... | 06/21/1994 |
| 5305835 | Nonrotary piston for jackhammer and removable splined nut therefor A fluid-activated, percussive impact tool has a piston therein that reciprocates longitudinally but not rotationally. The piston activates a wrap spring clutch to rotate the drill steel. A removable splined nut in combination with the tool's housing restr... | 04/26/1994 |
| 5191946 | Wrap spring clutch for percussive apparatus A clutch assembly transmits rotary motion in a percussive apparatus to a drill steel. The clutch assembly includes a first hub having a first cylindrical surface formed thereon. A second hub which is substantially rotationally coupled to the drill steel h... | 03/09/1993 |
| 5139093 | Wrap spring clutch for percussive apparatus A clutch assembly transmits rotary motion in a percussive apparatus to a drill steel. The clutch assembly includes a first hub having a first cylindrical surface formed thereon. A second hub which is substantially rotationally coupled to the drill steel, ... | 08/18/1992 |
| 5090487 | Drill head with integral impact hammers A drill head is disclosed, for use to drill a hole in a front of hard material such as rock, which comprises a main body acting at a central support, an upwardly projecting spindle secured on top of the main body, the spindle having a vertical axis, a fix... | 02/25/1992 |
| 4840235 | Impact hammer assembly for drilling rock An impact hammer assembly for use on a drill head intended for drilling hard material, such as rock. The hammer comprises an elongated hollow case opened at one end and a drill bit provided with a rear stem that is mounted in the hollow case, through its ... | 06/20/1989 |
| 4745980 | Auto-hammer driver An improved hammer driver includes a body with an outward flange on a lower portion thereof, a removable socket member adapted to driving a nut or bolt, a rotary member interconnecting the body and the socket member and including a radially extending rota... | 05/24/1988 |
| 4359109 | Impactor drill tool A rock drill apparatus has features that allow it to be attached to a conventional impact tool. The rock drill attachment has a housing that is secured to the impact tool carriage below the hammer of the impact tool. A tappet is carried in the housing of ... | 11/16/1982 |
| 4319646 | Rotary tool drive system for a jack hammer The invention is a rotary drive system for a jack hammer which incorporates a plurality of annular sleeves to transfer the motion generated by the piston to the tool holder and thereby allows the piston to strike the tool when the piston moves in the forw... | 03/16/1982 |
