Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7363922 | Flat chisel The invention relates to a flat chisel, in particular an insertion chisel for power-driven drill and chisel hammers for working stone, having a chisel head which has a main tip disposed transversely to a chisel longitudinal axis, a front and rear striking surface, a... | 04/29/2008 |
| 6994661 | Tiltable exercise bench A tiltable exercise bench featuring a pad hingeably mounted on a vertical post by a cantilevered hinge joint such that the bench can be tilted to a selected angle depending on the requirements of the user. An arcuate bar with notches on one edge has ends secured to ... | 02/07/2006 |
| 6981496 | Point chisel A point chisel for use with a power tool includes an elongate stem (1) having, at its power tool side a shank (2) for securing the chisel in the power tool and, at its workpiece side, a useful region (3) having its outer diameter (H) tapering to... | 01/03/2006 |
| 6827073 | Block splitting tool A block splitting tool having a splitting blade that is formed by edges of a plurality of smaller splitter segments. The splitter segments are arranged in a side-by-side relation such that the edges form a substantially continuous blade that is generally corrugated ... | 12/07/2004 |
| 6701805 | Stone working tool having multiple striking edges on reversible-replaceable plates A stone hammer having a weighted head has detachably rotatable and reversible faceplates defining striking edges on opposite ends of the head. The edges of the faceplates define cutting edges for trimming stone and the like. As a striking edge becomes wor... | 03/09/2004 |
| 6681756 | Attachment for a percussive tool An attachment for a percussive tool comprises a plurality of parallel rows of teeth (10) formed along the edges of planar chisel blades (9) arranged to form a shape having rotational symmetry. The attachment is connected to a percussive tool and placed in... | 01/27/2004 |
| 6502569 | No-vibration and no-noise rock splitter of oil hydraulic piston type A rock splitter of oil hydraulic piston type includes a housing having a plurality of cylinder chambers on the upper portion and first and second paths communicated with the cylinder chambers for supplying and discharging oil; a piston in the cylinder cha... | 01/07/2003 |
| 6199545 | Engraving apparatus and method Arrangements are taught for decoratively engraving a surface, such as hardened concrete or stone, particularly by engraving stencil-defined swaths into the surface with a tool of the type commonly called a needle scaler. The arrangements include methods o... | 03/13/2001 |
| 6050255 | Splitter blade assembly and station A splitter blade assembly adapted to form split faces on concrete masonry units including: a plurality of blade sections arranged to bound an opening; and a stop positioned within the opening so as to prevent debris from lodging in the opening during a sp... | 04/18/2000 |
| 5621962 | Method of manufacturing chisel for impact tool A chisel and a method of manufacturing a durable chisel. An axial hole is formed in a chisel so that the hole is open at the chisel tip. Non-metallic powder is then supplied into the axial hole. A core member made of cemented carbide or other material har... | 04/22/1997 |
| 5590639 | Masonary cutting tool and method The disclosure is directed to a method of masonary cutting and to the structure of a novel tool. The tool has twin outwardly splayed and flared chisel like blades which join the handle at a recess groove for waste ejection. The blades are beveled only on ... | 01/07/1997 |
| 4320924 | Reciprocated concrete surfacer member with shielded spring return A scabbler apparatus having a conventional reciprocated rod is provided with a bit secured to a shank member. A compression spring is adapted to urge the shank and rod upwardly while motive means is provided to drive the rod, shank and bit toward the surf... | 03/23/1982 |
| 4144868 | Chisel for an impact apparatus Chisel for an impact apparatus comprising a stem with connecting means, in line with said stem a blade-shaped, longitudinal chisel part, the free end of which is provided with a plurality of teeth which are thicker than the blade-shaped part. Extending fr... | 03/20/1979 |
