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| Number | Title | Issue Date |
| 4126237 | Lift truck safety system having protection against component failure A fork lift truck has an overload protective circuit which is responsive to an excessive tilting moment acting on the truck, as a result of a load on the raised carriage, to disable the mast tilting motor and carriage elevating motor from shifting the loa... | 11/21/1978 |
| 4121293 | Indication means for indicating suitable conditions for the transfer of loads between two stations movable relative to each other in a vertical plane For use with apparatus for transferring a load between two stations movable relative to each other in a vertical plane by means of a crane carried by one of the two stations having a hook assembly for attachment to the load on the other station for liftin... | 10/17/1978 |
| 4112750 | Hook device The present invention relates to a hook device with which safe handling operation can be assured. This device is constructed such that, as any load heavier than the predetermined weight is applied thereto, an eccentric shaft carrying a pulley for suspensi... | 09/12/1978 |
| 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 |
| 4078668 | Apparatus for monitoring and recording the load of a crane with a pivotal boom A crane boom pivotal about a horizontal axis is monitored as to loading over a prolonged period, e.g. a period of about 24 hours, by providing a position-dependent output representing the maximum permissible load moment on the boom at a particular positio... | 03/14/1978 |
| 4068773 | Lift vehicle with fail-safe overload protective system An overload protective system continuously monitors the forward overturning moment on a counterbalanced lift truck and prevents further raising of the carriage or further forward tilting of the mast when the overturning moment is excessive. Resistance str... | 01/17/1978 |
| 4067446 | Cable stay crane A crane for lifting of objects has a base and a substantially vertical column assembly extending from the base. A cross truss is mounted on the column, and cables are pivotally secured to the truss and fixed to the top of the column. Movably mounted on on... | 01/10/1978 |
| 4064997 | Crane swing safety control A system to prevent a crane turret and the boom carried thereby from rotating about the axis of the turret beyond a predetermined angular disposition, thereby to prevent the crane boom from being brought too close to high-tension wires or some other struc... | 12/27/1977 |
| 4063649 | Calibration of crane load indicating arrangement A device for the calibration of the safe load indicating apparatus on cranes and derricks that have a pivoted, extensible boom luffed by a hydraulic ram. The device operates by combining electrical signals corresponding to the actual turning moment of the... | 12/20/1977 |
| 4057792 | Overload safety device for telescopic cranes Overload safety device for telescopic cranes includes transmitter means for registering a working radius of a crane jib having a base jib member and transmitter means for registering a load applied to the jib, analog computer means operatively connected t... | 11/08/1977 |
| 4054055 | Device for controlling the load of a lifting appliance The invention provides a device for indicating the maximum permissible loads of a lifting appliance wherein a series of potentiometers are adjusted according to the variation of one parameter and control another potentiometer which is adjusted according t... | 10/18/1977 |
| 4052602 | Load and radius indicating system A load tensiometer transducer, a boom angle transducer and a boom length transducer are operatively connected to a telescopic variable boom length and crane product. Boom load, angle and length analog signal control logic, responsive to the signals of eac... | 10/04/1977 |
| 4047617 | Luffing crane with overload protection mechanism The winches of a luffing crane having two individually operated hoisting cables depending from different longitudinal sections of the boom are deenergized by an overload protection mechanism when the torque exerted during luffing by a single load suspende... | 09/13/1977 |
| 4029213 | Crane load indicating arrangement A crane load indicator in which actual loading is determined by a strain transducer as a function of shear stress on a crane boom. A resultant actual loading signal is compared with a computed signal representative of the maximum crane loading for the pre... | 06/14/1977 |
| 4027772 | Protective circuit for overload sensor A protective circuit for an overload sensor of a lifting boom, such as an aerial platform boom. Excess deflection of the boom under load, due to such factors as weight of the load, boom angle and boom extension, is detected by the actuation of an overload... | 06/07/1977 |
| 4006347 | System for a crane boom A crane boom, pivoted at one end to the chassis or body of the crane, is swung about a horizontal axis by a hydraulic drive mechanism, e.g. a double-acting piston-and-cylinder arrangement. A control system for this boom comprises a device which monitors t... | 02/01/1977 |
| 4003482 | Safety device for a crane A safety device for a crane compares two signals, one of which represents the actual load in any configuration of the crane and the other of which represents the permitted or critical load in that configuration, and produces a third signal when the first ... | 01/18/1977 |
| 3997071 | Method and apparatus for indicating effective digging depth of a backhoe In a backhoe of the type having an outreach boom horizontally pivotally mounted relative to a vehicle, a downreach boom horizontally pivotally mounted to the free end of the outreach boom, and a digging bucket horizontally pivotally mounted to the free en... | 12/14/1976 |
| 3993166 | Overload signalling system for fork lift trucks and the like An electrical alarm system, which responds to improper and/or unsafe loading of a fork-lift truck or other load-sustaining apparatus equipped with a suitable sensing transducer, is controlled by a high-gain electronic differential switch whose comparisons... | 11/23/1976 |
| 3993986 | Device for restricting the operation range of cranes This invention relates to a device for restricting the operation of cranes within the predetermined operation allowable range, said device having an operation control board on which is mounted a reduced-scale pattern which represents the operation range o... | 11/23/1976 |
| 3990584 | Electrical safety control device for a variable radius crane A safety device for a crane including means for continuously comparing an actual load carried by a lifting hook with an indicated maximum safe working load for that particular working radius.... | 11/09/1976 |
| 3987906 | Apparatus for preventing the tilting of telescopic jib cranes Apparatus for preventing the tilting of a telescopic jib crane wherein a hydraulic cylinder is provided for raising the jib. The apparatus includes switches for monitoring the cylinder pressure and the elevation of telescopic position of the jib. Preselec... | 10/26/1976 |
| 3971008 | Crane overload detector using a boom bending moment detector For a crane having a boom for hanging loads apparatus for detecting overload is provided which comprises a boom bending moment set value generator, which is determined by a variable quantity corresponding to the operating radius of the crane, a boom bendi... | 07/20/1976 |
| 3969714 | Safety system for cranes A safety system for sensing the position of a load being carried by a crane, relative to the boom thereof. It comprises a self-powered radio transmitter positioned on the end of the boom of the crane, and an on-off switch to be engaged by a load-carrying ... | 07/13/1976 |
| 3965733 | Crane load inidicating arrangement A crane safe load indicator combines signals representing the total loaded boom turning moment and the turning moment of the boom alone to derive a third signal representing the turning moment of the load alone. The third signal is compared with a signal ... | 06/29/1976 |
| 3965464 | Device for automatically detecting overload on aerial ladder truck A safety device is provided for association with an aerial ladder truck assembly to automatically detect a weight overload on the ladder unit of the assembly at any given angle. The safety means are characterized by providing ladder angle detecting means ... | 06/22/1976 |
| 3952879 | Overload control for lifting boom A machine has a movable boom for lifting a load, and an overload sensing device mounted on the boom to sense boom deflection. The overload sensing device includes a rigid beam having one end secured to a vertical side plate of the boom only by anchors spa... | 04/27/1976 |
| 3932855 | Crane radius instrument A transducer is mounted on the boom to produce an electrical signal proportional to the angle the boom has moved in a horizontal plane. A resistance related to the boom length receives the output of the transducer and supplies a current proportional to L ... | 01/13/1976 |
