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 |
| 7269908 | Tool for projecting a visually perceptible plumb line from a proposed location of a fire sprinkler head on a suspended ceiling and method of using A tool for projecting a visually perceptible plumb line extending from a proposed location of a fire sprinkler head on a suspended ceiling. The tool includes a base and a self-leveling laser. The base is configured and arranged to supportably engage the support beam... | 09/18/2007 |
| 6981331 | Fork level indicator with magnetic dampening means A magnetically damped fork level indicating device comprises a housing having a gauge section; an elongate indicator arm pivotally coupled to the housing, the arm having first and second sections disposed on opposite sides of the axis; a weight coupled to the indica... | 01/03/2006 |
| 6968627 | Slope determination system A hand-held system for determining the slope of an element having an irregular surface, such as a shingled roof, or along a surface that is partially obscured by adjacent elements. The system comprises an inclinometer having a double indicator to provide two simulta... | 11/29/2005 |
| 6722049 | Inclination measurement apparatus Inclination measurement apparatus includes an indexable clinometer bearing turntable rotatable in a single plane between a pair of precisely reproducible diametrically opposite orientations with respect to the desired measurement axis for respectively issuing inclin... | 04/20/2004 |
| 6625895 | Servo-controlled automatic level and plumb tool A method and apparatus for leveling at least one output light beam in a construction tool. One embodiment of the apparatus includes a laser optical assembly for producing output light beams that define plumb, level, and right angle beams for use in constr... | 09/30/2003 |
| 6546639 | Inclination measurement apparatus Inclination measurement apparatus for measuring the inclination of a surface to the horizontal. The apparatus includes (a) a base plate for mounting the apparatus on the surface; (b) a ball bearing with i) a housing washer rigidly mounted on the base plat... | 04/15/2003 |
| 6536122 | Laser line beam emitting apparatus having functions of laser marking or plumb instrument, or leveler There is provided a laser line beam emitting apparatus with high durability. The apparatus according to the present invention has avoidance of deformed or damaged shafts by construction where possible free maintenance of the balance of the pendulum being ... | 03/25/2003 |
| 6393708 | Method and apparatus for providing alignment particularly in construction tasks A projection apparatus for projecting the axis of a plumbing fixture or an existing opening in a construction member onto a remote member, for locating an opening to be made in the remote member, has a body having at least a first cylindrical portion with... | 05/28/2002 |
| 5752322 | Gimballed ouroboros compass device with digital logic A gimballed compass apparatus with digital logic is disclosed which provides directional and attitudinal data. The apparatus comprises a rotatably mounted slotted disk wherein the slot is continuously varying in width around the circumference of the disk.... | 05/19/1998 |
| 5406713 | Apparatus for maintaining a scientific and measuring instrument or the like in a level plane An apparatus for maintaining a scientific or measuring instrument or the like in a level horizontal plane. The apparatus comprises an inclinometer comprising a support housing and a plumb member freely suspended within the support housing. The plumb membe... | 04/18/1995 |
| 5163229 | Plumb and horizontal locating device A device is disclosed for accurately and precisely locating specific points on ceilings or, alternatively, on the the same horizontal plane. A light emitting means, a pendulum, a support, and two cylindrical rods act in concert to provide a light beam tha... | 11/17/1992 |
| 5138771 | Three dimensional homologous surveying instrument A three-dimensional homologous surveying instrument includes a base with a spherical cover mounted thereon for receiving therein a shell holder, an intermediate spherical shell and an inner spherical shell with respective zero references set in a homologo... | 08/18/1992 |
| 5112053 | Golf club and plumbing device thereof A device (10) for facilitating use of the shaft (28) of a golf club (30) for plumbing is disclosed. The device comprises two concentric members (12, 16), one freely movable inside the other, with the inner member (16) seated about the shaft (28) of the cl... | 05/12/1992 |
| 5063680 | Self-erecting tiltmeter A self-erecting tiltmeter includes a vertical seeking assembly suspended on a gimbals within a housing which contains a viscous fluid. Portions of the assembly outer surface spherically match corresponding portions the housing inner surface, leaving a gap... | 11/12/1991 |
| 4949467 | Inclinometer including an apparatus for maintaining a scientific and measuring instrument or the like in a level plane The present invention provides an inclinometer comprising a supporting housing and a plumb member suspended within that supporting housing. The plumb member is provided on its exterior surface with a sensor, while the supporting housing is provided on its... | 08/21/1990 |
| 4635375 | Vertical shaft system for gyroscopic theodolites with two degrees of freedom A vertical shaft system for gyroscopic theodolites with two degrees of freedom for ensuring the vertical alignment of the azimuth determining pendulum system in the apparatus, wherein perforated stones are arranged in two axial points on the housing and o... | 01/13/1987 |
| 4517749 | Stable plumb beam optical projector A viscous dampened sensitive pendulum carries a generally upwardly directed light source for indicating the gravity vertical. The sensitive pendulum is carried for two degrees of pivotal freedom by flexural pivots which are biased for operation at an erro... | 05/21/1985 |
| 4389792 | Drill core inclinometer A drill core inclinometer is releasably mountable in a core barrel and includes a device for measuring the vertical and transverse inclination of the drill core before the core is detached from the matrix. The device, once it has effected the measurements... | 06/28/1983 |
| 4288056 | Device for setting the direction and/or the inclination of an elongated rock drilling apparatus A device for setting the direction and/or inclination of an elongated rock drilling apparatus. The actual value of the direction in each of two perpendicular planes is sensed by a rotatable screen having a pattern of parallel opaque lines separated by int... | 09/08/1981 |
| 3975831 | Directing instrument A directing instrument for control of the inclination of the drill post of a drilling apparatus comprising means for sensing the inclination of the post in two directions at right angles to one another. Said means being supported by a holder arranged to b... | 08/24/1976 |
