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| Number | Title | Issue Date |
| 7062962 | Portable apparatus and method for measuring hydraulic features in rivers and streams A portable apparatus for measuring characteristics of hydraulic features in rivers and streams that are unwadeable. The apparatus consists of a tripod base, a horizontal boom that articulates on the tripod, a carriage configured to travel on the boom, and a measurin... | 06/20/2006 |
| 5597079 | Directional indicating device for detecting improper orientation of a hoist lifting line An indicating device is provided which includes a pivotal member mounted on a base plate attached to the frame of the trolley on which the hoist is supported, and a pair of spaced apart projections extending from the pivotal member and between which a rop... | 01/28/1997 |
| 5409346 | Self-loading and unloading forklift truck The chassis of a forklift truck includes a front assembly and a rear assembly which, in certain embodiments, are movable toward and away from each other between an extended stable normal working condition and a contracted compact condition for storage or ... | 04/25/1995 |
| 5012939 | Color coded boom and chart system for proportionally extensible boom assembly In a multiple stage boom including a base boom and a plurality of relatively extensible and retractable boom stages, a system for displaying the load rating information relative to the boom includes an angle measuring assembly and a color coded boom and c... | 05/07/1991 |
| 4809857 | Drum rotation indicator A drum rotation indicator for indicating the speed of raising and lowering a load by a crane winch. A rate generator connected to the winch develops electrical pulses having a frequency proportional to winch rotational speed. A solenoid having a movable p... | 03/07/1989 |
| 4798299 | Pivot ring An improved pivot ring assembly which has a first and second annular member, one of which is mounted within the other, the first and second annular members having a first and second spaced apart race, respectively, that face one another, and rolling eleme... | 01/17/1989 |
| 4664272 | Telescoping crane boom with locking and indicator means A power actuator on the base section of a multisection telescoping crane boom can bridge at least one intermediate boom section to operate a biased locking pin retract mechanism employed in a system for remotely controlling the operation of a manual fly s... | 05/12/1987 |
| 4635805 | Crane boom locking pin insertion indicator and actuator means A power actuator on the base section of a multi-section telescoping crane boom can bridge at least one intermediate boom section to operate a biased locking pin retract mechanism employed in a system for remotely controlling the operation of a manual fly ... | 01/13/1987 |
| 4467928 | Pendant supported boom with fixed and live pendant portions A pendant supported extensible boom is disclosed having the boom and a live mast pivoted to a base about an axis near the lowermost surface of the boom for providing a stowed mast-boom angle of about 10°, and a fixed length pendant is provided to maintai... | 08/28/1984 |
| 4359137 | Safeload indicator for aerial lift platform apparatus A workman's lift platform apparatus has a vertically swingable and extensible boom with a workman's platform at the outer end. A color coding indicating the amount of boom extension is provided on the fly section of the boom, visible to the workman in the... | 11/16/1982 |
| 4326601 | Aerial lift platform apparatus with capacity indicator A workman's lift platform apparatus has a vertically swingable and extensible boom with a workman's platform at the outer end. A color coding indicating the amount of boom extension is provided on the fly section of the boom, visible to the workman in the... | 04/27/1982 |
| 4258484 | Implement position indicator An adjustable contact portion is detachably secured to the mast of an implement such as a snow plow blade and the other contact is secured to the fluid operator in the mast which raises and lowers the blade. These contacts are operatively connected to the... | 03/31/1981 |
| 4249474 | Load-carrying slings A sling has an indicator device which automatically registers the maximum permissible load which can be carried in accordance with the instantaneous angle of inclination of the strands of the sling.... | 02/10/1981 |
| 4211332 | Color coded boom and chart system A color coding system for correlating the stages of a multiple stage, telescoping boom with the corresponding sections of a load chart and boom extension chart. The charts are arranged in separate sections which indicate, for various positions of the boom... | 07/08/1980 |
| 4172688 | Device for anti-rolling signalling for cable laying tractors A signalling device operatively coupled between the side arm or lifting boom of a pipe layer and the frame thereof in a predetermined fixed position such that movement of the signalling device relative to the fixed position, which occurs in response to th... | 10/30/1979 |
| 4141454 | Crane with "Z" configured boom A crane having a boom pivotally mounted mesially thereof to a mast which is itself pivotally mounted on a base platform. A generally horizontally disposed control beam is line attached to the free, rear end of the boom and includes a hydraulic fluid-compr... | 02/27/1979 |
| 4099628 | Towing vehicle A towing vehicle which has a frame and a drive train for propulsion of the vehicle along a roadway and which includes a turntable mounted on the frame for rotation about a vertical axis, a boom assembly fixedly attached to the turntable, a telescoping boo... | 07/11/1978 |
| 4098410 | Safe load indicator for jib cranes An overload warning device for use in a crane having a telescopic jib which includes, in a transmission between a slave jib and a pointer, a bank of cams each appropriate for a different length of jib, a common follower cooperable with the cams, and a sel... | 07/04/1978 |
| 4078667 | Control system for mechanical handling installation The control system is of the type which is manually controlled by a suspended control box. Directional errors arise when the control box is twisted relative to the installation being controlled since the controls on the control box no longer have their or... | 03/14/1978 |
| 3961685 | Ladder working limit based ladder stopping device for aerial ladder truck There is provided a ladder working limit based ladder stopping device for a vehicle equipped with a vertically and horizontally swingable and extensible ladder (or a fire engine truck), wherein a working limit of the ladder is preset on the basis of an ex... | 06/08/1976 |
