Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7370510 | Shock apparatus One embodiment of a shock apparatus comprises a plurality of impact objects spatially ordered according to decreasing mass along a substantially linear path; a guide to guide movement of the impact objects along the path; and a plurality of spacers, one spacer betwe... | 05/13/2008 |
| 7303027 | Grounding rod driving system A grounding rod driving system for facilitating installation and extraction of a grounding rod includes a sleeve slidably receiving a grounding rod. The sleeve slides along the grounding rod when the grounding rod is being driven into a support surface. A driver is ... | 12/04/2007 |
| 7111690 | Manual slide post driver and extractor for âTâ-type metal or fiberglass or plastic posts A post driving device is disclosed. The post driving device slides to a desired position and is essentially locked in place through frictional force. As the post is driven into the ground, the device can be adjusted to a new position along the length of the post. | 09/26/2006 |
| 7090429 | Highway delineation unit and method of installing same A highway delineation marker fabricated of two thin, resilient, elongated panels, U-shaped in cross section, secured together open-face to open-face, capturing a foam core. The lower end of the rear panel is captured behind a tab on the front panel for ease of inser... | 08/15/2006 |
| 7063706 | Distraction device A distraction device for moving a one-part or two-part or separated bone apart in order to extend or bridge a bone gap. The device is optionally provided in the form of an intramedullary pin, which can be inserted into a medullary space of a bone and which has at le... | 06/20/2006 |
| 6857482 | Percussive implement of the rock breaker type The invention concerns an apparatus comprising a body (2) wherein a piston (6) is mounted sliding alternately driven by an incompressible fluid under pressure, said body containing part of a tool (4) which is guided in translation in a wear slee... | 02/22/2005 |
| 6578644 | Percussion rotary hand-held power tool with a rotatable guide tube A percussion rotary hand-held power tool including a percussion piston (3), an anvil (5), a chuck (4) for receiving a working tool, an axially displaceable and rotatable guide tube (6) located in the housing (2) and extending in a telescopic-like manner o... | 06/17/2003 |
| 5549168 | Pile driving apparatus A pile driving apparatus including two vibratory hammer units fixed to the top of a support plate having a U-shaped cutout, and a pair of hydraulic clamps fixed to the bottom of the support plate. The support plate is secured to the pile when the hydrauli... | 08/27/1996 |
| 5462126 | Ground rod driver An ground rod driver including a tubular ground rod receiver engaging a prime mover at one end and having a ratcheting ground rod driving member and a clamping setscrew disposed at an opposite end wherein a ground rod may be inserted, clamped at an initia... | 10/31/1995 |
| 5259464 | Percussion mechanism for a drill rod unit A drilling apparatus includes a drill rod unit having at least one drill rod; a percussion mechanism having a housing; a percussion piston having an axis and being slidably received in the housing; and a hydraulic system for generating pressures in the ho... | 11/09/1993 |
| 5174386 | Ground rod driving apparatus A ground rod driver has a housing with upper and lower ends, and inlets and outlets for hydraulic fluid. A check assembly in the housing adjacent its lower end includes a chuck with a central bore and a multiplicity of chuck jaws slidably seated in the bo... | 12/29/1992 |
| 5167288 | Rod driving tool A tool comprising a temporary attachment to a rod being driven into the ground. The tool has jaws to grip the rod and has a pressure or impact receiving surface so a kelly bar may be brought to bear on the attachment. The jaws hold the rod coaxially with ... | 12/01/1992 |
| 5082231 | Post holder and marker therefor A post-support for permanent installation at or below ground level includes a post-receiving collar affixed to fins. The fins have collar supporting shoulders against which a post may rest. A driver/cap/marker has a cap and a sleeve and the sleeve length ... | 01/21/1992 |
| 4971479 | Post driver A post driver for inserting or removing marker posts into the ground. The driver comprises two components, the hammer and the bracket, which cooperate in a safe and efficient means for installing and removing marker posts. The hammer locks around the post... | 11/20/1990 |
| 4641715 | Apparatus for driving and retracting ground rods or the like An apparatus is disclosed for driving or retracting ground rods or other rod-like members and preferably includes an element for forcibly urging a body portion in longitudinal directions generally parallel to the rod or rod-like member being driven or ext... | 02/10/1987 |
| 4494612 | Manually operable post driver A manually operable post driver for posts (10) including a slide hammer (11) and removable anvil (12) mounted on the post for accomplishing the driving is described. The anvil (12) is rigidly secured by removable nuts (35, 36) on studs (33, 34) to the pos... | 01/22/1985 |
| 4462468 | Ram head for self-driven pneumatic ram drills A ram head for self-driven pneumatic ram drills for producing boreholes in the earth, having a generally tubular housing within which there is movable axially back and forth an impact piston whose impact energy can be transmitted to the ram head arranged ... | 07/31/1984 |
| 4448264 | Ground rod driving pole A driving pole for a ground rod or the like is provided wherein the ground rod is positioned in the hollow interior and driven into the ground in increments. Vertically spaced cross pins provide incremental stops for engaging the top of the ground rod for... | 05/15/1984 |
| 4335622 | Soil gas probe Provided is a soil gas sampling probe having shaft extensions, a removable hammer and anvil combination to drive the shaft into the ground, a pointed rotation resistant probe tip, and a movable septum holder.... | 06/22/1982 |
| 4298075 | Drive means for traffic delineator A drive means is provided for driving into a roadway surface a traffic delineator assembly of the type which includes a channel shaped anchor post having a pair of outwardly extending flanges, the upper end of the channel being connected to a solid pilot ... | 11/03/1981 |
| 4298074 | Surgical device using impulse motor The present surgical tool uses high frequency impulses to replace rotating or oscillating members in cutting through or inserting materials into bone. One embodiment comprises a chisel which uses high frequency impulses to remove bone or other hard materi... | 11/03/1981 |
| 4280567 | Device for driving root supports of poles into the ground The invention relates to a device for driving root supports of poles into the ground by a weight that is guided by a guide. The weight is lifted up by a rope that passes over a pulley on the guide. The lower portion of the guide is provided with an instal... | 07/28/1981 |
| 4159040 | Pneumatic percussion tool A distinguishing feature of the present invention consists in that the menism for driving in rod-shaped elements into compact or frozen ground comprises a guide tube to accommodate said rod-shaped element. The tube extends throughout the length of the sh... | 06/26/1979 |
