Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7883072 | Shaking apparatus, shaking method, and audiovisual system A shaking apparatus for shaking a seat where a user sits down, including actuators, wherein the seat is supported by supporting parts at least at a front side, a rear left side and a right side, or a rear side, a front left side and a right side. The seat is incline... | 02/08/2011 |
| 7357365 | Extendable/retractable support column An extendable and retractable column which is formed from at least three linked sections. The linked sections include a plurality of individual sections linked end to end. As the linked sections are extended, each of the individual sections of the linked chains enga... | 04/15/2008 |
| 7303366 | Three part blind fastener The current invention is directed to a three piece blind fastener comprising a mandrel 40, a tubular body portion of 10 and a radially extending flange 14, wherein the cylindrical body 10 is mounted on an elongate stem 42 of the ma... | 12/04/2007 |
| 7216401 | Hinge assembly and housing A hinge assembly adapted for a housing having a main body and a sub-body rotatably positioned on the main body, the hinge assembly including: a first hinge portion adapted to rotatably support both lower sides of the sub-body; and a second hinge portion adapted to r... | 05/15/2007 |
| 6935216 | Belt tensioning device A belt tensioning device for shifting a pulley such that a belt passed around the pulley is tightened to a predetermined tension. The device includes a rod coupled to the pulley, a member coupled to and movable along the rod, and a spring that exerts a reactive forc... | 08/30/2005 |
| 6503033 | Parallel mechanism structure for controlling three-dimensional position and orientation Disclosed is a parallel mechanism structure for controlling three-dimensional position and orientation. In the parallel mechanism structure according to the present invention, three links are connected to the main spindle of the mechanism and driven in ve... | 01/07/2003 |
| 5865063 | Three-axis machine structure that prevents rotational movement A three-axis machine control structure includes a support structure and a machine component to which a workpiece or tool can be attached. Three control arms are connected between the machine component and the support structure. Preferably, each control ar... | 02/02/1999 |
| 5451134 | Material handling devices and controllers A powered material handling apparatus or lift provides for the movement and positioning of large, heavy and/or bulky objects using six degrees of freedom of motion. The lift may be used for the handling of virtually any such materials, but is especially s... | 09/19/1995 |
| 5245898 | Slicing machine lift arrangement A safe lift device for a slicing machine as provided which enables at least a portion of the slicing machine to be raised from the table or counter upon which it rests. Intermediate the two legs to be raised, a retention leg is pivotally attached to the s... | 09/21/1993 |
| 5014953 | Hinged-arm type of mechanism and sonar antenna fitted out with a mechanism such as this Disclosed is a mechanism comprising an arm hinged on a connecting rod to make a choice, on the basis of a translational motion along two opposite directions, between "lowered arm" and "outstretched arm" positions that are substantially orthogonal to each ... | 05/14/1991 |
| 4886233 | Fire fighting ventilation system An apparatus for transporting and supporting fire fighting ventilation equipment is disclosed. A fan support frame supports one or more ventilation fans thereon. Extending in an upward direction from the fan support frame are a pair of arms whose length m... | 12/12/1989 |
| 4872363 | Electric positioning apparatus A three-dimensional positioning apparatus comprising a base (180), a first element (182) and a second element (186) is constructed in the form of a sawhorse bracket. The first element (180) is pivotable about a first pivot axis (184) only, and the second ... | 10/10/1989 |
| 4792110 | Tooling support apparatus with linear boom A tooling support apparatus in which a linear tooling boom has one end adapted to support a tooling member and its opposite end connected to a scissors-lift apparatus for adjusting the height and horizontal position of the tooling boom.... | 12/20/1988 |
| 4790718 | Manipulators A manipulator comprises three arms 1 which can pivot at different points on a supporting structure 6 and which can be driven longitudinally to adjust their effective lengths. The longitudinal axes of the three arms intersect at a common point but their lo... | 12/13/1988 |
| 4781375 | Method and apparatus for adjusting a basketball goal An apparatus for adjusting the height of a basketball goal comprising a telescoping support pivotally mounted to form a diagonal within a deformable parallelogrammatic structure. The telescoping support has an outer cylinder slidably connected over a conc... | 11/01/1988 |
| 4735394 | Arrangement for adjusting the inclination of a keyboard The inclination adjusting arrangement is applied to a keyboard having a base structure in which a plurality of keys is mounted. The keyboard is provided in its lower portion with fixed front support feet and rear support feet. The rear feet can project by... | 04/05/1988 |
| 4693444 | Height adjust mechanism A height adjust mechanism which may be advantageously used to set a keyboard to a predetermined number of angles with respect to a support surface upon which the keyboard sits. The apparatus is integral with the keyboard base and includes an adjustment fo... | 09/15/1987 |
| 4546942 | Portable platform for slide projection This platform provides a portable and convenient support for a slide projector. Primarily, it consists of a plate, which is received on the bolt of the head of a tripod. It further includes a knurled nut, for tightening the plate secure to the tripod, whi... | 10/15/1985 |
| 4523882 | Drill press with overhead mount A drill press includes an overhead mount for supporting a power-operated drilling unit from an existing structure at locations above a work area, thereby enabling the accurate drilling of holes in large workpieces. An upright member is attached to one por... | 06/18/1985 |
| 4141523 | Projector having an adjustable height A projector adjustable in height includes a housing formed with a longitudinal slit at one side thereof, which slit is transverse to the axis of projection of the projector, a handle which has an axis of rotation transverse to the projection axis and to t... | 02/27/1979 |
| 3995701 | Derrick tilting system A shaft drilling machine generally includes a pivotable power swivel supported on a drilling assembly moved along a mast by hydraulic cylinders. Improved means for positioning the mast include a screw jack assembly with one end adapted to be secured to th... | 12/07/1976 |
