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 |
| 7243474 | Methods and apparatus for forming and placing generally horizontal structures One embodiment of the present invention provides for a method of placing a concrete structure in a generally horizontal position. The method includes building the concrete structure in an essentially vertical position, the concrete structure being defined by a first... | 07/17/2007 |
| 7086547 | Travelling working machine This invention provides with a travelling working machine comprising an upper rotating body with a rotating frame and winches, a pair of right and left boom support frames formed in the rotating frame, and axial portions of the winches mounted inside rear portions o... | 08/08/2006 |
| 6095349 | Knock-down hoist A knock-down portable hoist comprising a first member attachable to a support member, the first member supported substantially vertically by the support member, a second member insertable into and rotatably substantially vertically by the first member, su... | 08/01/2000 |
| 5676264 | Hydraulic boom stop A hydraulic boom stop for a crane that permits operation at angles greater than the normal maximum operating boom angle of the crane boom. The hydraulic boom stop has at least one hydraulic cylinder and a hydraulic control system that is user controlled. ... | 10/14/1997 |
| 5611177 | Portable tower with tower member position detection system In one aspect of the present invention, this is accomplished by providing a tower that includes a fixed member; at least one movable tower member, the at least one movable tower member is movable relative to the fixed member. The tower also includes a dri... | 03/18/1997 |
| 5480041 | Trailer-mounted crane Disclosed is a new trailer-mounted crane for providing a vehicle-trailable general purpose lightweight crane. The trailer-mounted crane comprises a flatbed trailer defining a transportable crane base. A crane boom, comprising an elongated steel channel ha... | 01/02/1996 |
| 5064339 | Backhoe boom lock A backhoe loader has a rearward backhole mechanism having a swing frame pivotally connected to a tractor main frame on a pair of vertical pivots. A backhoe boom is swingable on a transverse pivot carried by the swing frame by actuation of a hydraulic cyli... | 11/12/1991 |
| 4997333 | Backhoe boom lock A tractor-loader-backhoe is disclosed wherein the loader mechanism is mounted on the frame of the prime mover by a tapered pivot pin having a fastener extending entirely through the axis of the pivot pin to effect a clamping load operable to seat the tape... | 03/05/1991 |
| 4557390 | Suspended counterweight control system An apparatus is disclosed for counterbalancing a load carried by a crane by a counterweight suspended from the mast of the crane. A counterweight height control system is provided for maintaining the counterweight a few inches above the ground during oper... | 12/10/1985 |
| 4407629 | Lifting apparatus for down-hole tubulars An improved boom for a drill rig is described which includes two rotatably mounted clamps which are rotatable between a side loading position, to facilitate loading and unloading in the horizontal position, and a central position, in which a clamped tubul... | 10/04/1983 |
| 4270663 | Stop for crane boom A crane has a rotatable body with a vertically pivotal boom connected thereto. An energy absorbing stop unit is mounted in a fixed position on the body, and a guide sleeve is pivotally mounted on the body adjacent the stop unit. A stop rod is pivotally co... | 06/02/1981 |
| 4169535 | Crane The specification discloses a crane including a base having a boom pivotally supported at one end from the base. The opposite end of the boom is adapted for receiving the load to be carried by the crane. A mast and upper tension member system are affixed ... | 10/02/1979 |
| 4043253 | Boom cylinder stop for the lift cylinders of a skid steer vehicle A boom stop having a elongated tubular body portion is mounted on the rod end of one of the hydraulic lift cylinders of a skid steer loader. When the boom of the skid steer loader is lifted, the boom stop is carried outwardly with the rod end of the cylin... | 08/23/1977 |
| 4005780 | Boom stop and back hitch compensating system The back hitch assembly for a lift or tower crane includes a tension sensing device which regulates the pressure delivered to the boom stop or hold back cylinders such that as the boom hoist line and back hitch become slack when the load line is relieved ... | 02/01/1977 |
| 4003474 | Crane boom stop arrangement In a crane boom stop arrangement of the type having a compression strut which is pivotally mounted at one of its ends to the crane superstructure and a link strut pivotally connected to the opposite end of the compression strut and to the crane boom and i... | 01/18/1977 |
