Showing papers on "Boom published in 1977"

Two axes controller

Abstract: A two axis controller for controlling a tanker aircraft in-flight refueling boom while maneuvering prior to engagement with the receiver aircraft and including a boom load alleviation system after engagement Movement of the control stick is transmitted mechanically to a position transducer The transducer provides a signal to an actuator to effect boom control The transducer output is also transmitted to a servo motor which is mechanically connected to the control stick During the free flight mode, when the operator is manually controlling the boom, the servo motor provides a resisting force to stick movement that varies as a function of the transducer signal Following coupling of the two airplanes, which initiates the automatic load alleviation system, the same servo motor back drives the control stick in response to boom force and position signals to alleviate boom forces Manual override of the automatic system is possible at any time

Air refueling boom pivot gimbal arrangements

Abstract: An aerial refueling boom utilized in the transfer of fuel from a tanker airplane to a receiver airplane and more particularly, to the boom geometry or gimballing which comprises an axis fixed with respect to structure of the tanker airplane about which the boom rotates in elevation and an inclinable axis about which the boom rotates for lateral movement. The angle of inclination of the boom lateral motion pivot axis or azimuth axis varies with respect to the longitudinal axis of the airplane axis as the boom is changed in elevation angle. A pair of aerodynamic surfaces formed into a Vee and known as ruddevators are mounted towards the trailing end of the boom for flying the boom about these axes. The ruddevators are part of a control system which includes a pantographing cable system for automatically changing the angle-of-attack of the aerodynamic surfaces and for alleviating the air loads imposed by the receiver airplane when it is imparting the movement of the boom during the refueling engagement. The boom support system includes articulation which provides for combining a certain amount of boom rolling action with sideward movement of the boom and varies the ratio between the degree of roll motion vs. the degree of azimuth, as the boom is raised and lowered during changes in elevational angles while operating within the normal ranges of the refueling disconnect envelope.

Barrier for water carried pollutants

Abstract: A barrier for water carried pollutants comprises a series of end to end connectable boom sections containing a flotable material; fluid impervious connectors for the ends of the boom sections; flexible draft members and associated connectors for maintaining the integrity of the boom if it becomes necessary to replace one or more of the boom sections, and means associated with the flexible draft members and the fluid impervious connectors whereby separating stresses are minimized at the end connections of the boom sections.

Vehicle mounted boom apparatus

Abstract: A vehicle mounted boom apparatus includes a lower boom member pivotally mounted on the vehicle and an upper boom member pivotally connected to the lower boom member. An elongate chain saw mechanism includes an elongate support arm shiftable mounted on the upper boom member to permit pivoting movement of the chain saw mechanism relative to the upper boom member about a pair of pivotal axes disposed substantially normal to each other. The chain saw mechanism is also provided with power shifting means to rotate the chain saw mechanism about its longitudinal axis relative to the upper boom member.

High lift loader with extended transfer

Abstract: A versatile mobile high lift loader characterized by an extendible telescopic boom carried by a longitudinally extendible transfer carriage. The transfer carriage travels on stepped fore and aft longitudinal transfer rails for greater operator visibility. The transfer rails are stepped laterally to provide for maximum width of the operator compartment and to permit the use of dual front wheels. The transfer carriage and boom extension travel on cam roller non-friction bearings for cycling demands of the fork lift transferring boom. The transfer rails include readily replaceable hardened wear surfaces on a unitized frame. The loader includes modular drive train fabrication for less expensive manufacturing cost and easier servicing. It is provided with drive line disc brakes and locking differential for easy servicing, non-power assist and positive braking with and without load. The telescoping boom includes a novel hose reel assembly for transfer of internal hosing within the boom. The telescoping boom segments travel on readily replaceable hardened rails that also serve to give outer fiber strength and buckling resistance. The boom may be fitted with a fork lift or crane hook or similar work performing means, dependent upon need. The load handling mechanism can be retracted behind the front wheels for close approach to buildings. Load transfer is by pure horizontal motion.

Vertical motion compensated crane apparatus

Abstract: Disclosed is a crane employing a fluid cylinder and piston assembly secured to the crane boom and operatively interconnected with the cable between the boom sheave and the load hook to vary the vertical distance between the boom sheave and the load hook in response to relative vertical movement between the crane boom and the platform to or from which a load is to be transferred. Sensors which generate a signal in response to vertical movement are associated with each platform which is movable with respect to a fixed horizontal position. Signals from the sensors are used to control the position of the piston in the cylinder and thereby vary the vertical separation between the hook and the boom in relation to relative vertical movement between the boom and the landing platform.

Telescoping lattice boom crane

Abstract: A lattice boom crane is provided with multiple boom sections which telescope one from the other to provide a variable length boom. A cable system is connected between the boom sections such that the boom sections are telescoped as the cable is drawn in by a winch mechanism. Cables drawn in by the winch mechanism is directed to a block system which is connected between a gantry structure and the point end of the outermost boom section. The winch mechanism includes two drums about which the cable is alternately wrapped. The block system expands at substantially the same rate as the boom sections extend. Thus, the boom angle, which is determined by the effective cable length between the gantry and the point of the boom, is not significantly effected. In one embodiment of the invention, the cable taken in by the block system is received on a boom hoisting drum which may be controlled to change the effective cable length between the gantry and the point of the boom to vary the boom angle. In a separate embodiment, a separate cable system connected in series with the block system is used to vary the effective length of the cable between the gantry and the point of the boom to vary the boom angle.

Lifting equipment having telescopic boom with automatic extension limiting

Abstract: Mobile lifting equipment having a wheeled vehicle with a frame. The boom structure is mounted on the frame for rotation about a vertical axis, raising and lowering the same about a horizontal axis and for extension and retraction with respect to the vehicle. The boom structure includes an outer boom and an inner boom which is mounted for telescoping movement in the outer boom. First and second extension cylinders are carried by the outer boom for extending and retracting inner boom with respect to the outer boom. An elevation cylinder is connected to the outer boom and is provided for raising and lowering of the boom structure. An elevation control is provided for supplying hydraulic fluid to the elevation cylinder. Piping is provided for connecting the elevation cylinder to one of the first and second extension cylinders so that extension of said one of said first and second extension cylinders is limited by the amount of hydraulic fluid which has been supplied from the elevation cylinder.

Lift for small vehicles

Abstract: Repositionable lift apparatus is constructed of a boom pivoted at one end near the upper end of a post. The other end of the boom pivotally supports a platform and a power cylinder is provided to pivot the boom to raise its other end from a loading position to a working position. In the loading position of the boom one end of the platform is a grade so that a vehicle may be rolled thereon. In the working position of the boom a stop means on the platform engages the boom to position the platform in a raised generally horizontal position. A manually operated winch is provided on the boom to load a vehicle on to the platform and a safety means automatically positions itself to block sudden collapse of the power cylinder arm.

Low profile mining machine

Abstract: To maintain the lowest possible machine profile between the bottoms of the crawler treads and the top of the turret, the boom of the machine and boom lifting cylinders are cantilevered forwardly of the turret and depressed to lie as closely as possible to the underlying gathering head of the machine without clogging the throat of the machine and/or interfering with the operation of the gathering arms. The boom pivot and boom lift cylinders are disposed ahead of the crawler treads and the connections of the boom lift cylinders with the turret are forwardly of the highest part of the gathering head. This geometry renders it possible to significantly lower the elevation of the machine turret on which the boom is mounted for sluing or swinging movement and thus minimize the total height or profile of the mining machine.

The Australian crisis from boom to bust

Abstract: Australian manufacturing industry is in acute financial crisi-s. Unemployment is high. Factories are running below capacity. Many firms have borrowed to the hilt, with capacity under trust deeds and cr~dit standing eroded ... In part, manufacturing's problems are manifestations of the world economic crisis in which all countries, including Australia, are enmeshed. But, in Australian manufacturing, there is a deep-seated and long-standing malaise. That malaise has sharpened the impact on industry of the current economic crisis. When it passes, the malaise of manufacturing will still be there. (Jackson Report 2 ) -

Hydraulically-operated fertilizer and chemical-spreading boom

Abstract: A spray boom apparatus for attachment to a chemical and fertilizer-spreading farm vehicle for spraying chemicals over crops and farmland. The apparatus comprises a pair of spray booms which are hinged to a support rack. Each boom is further connected to the support rack by means of a hydraulic cylinder which allows each boom to be positioned in an outwardly-projecting dispensing position. The support rack is hinged to a stationary brace which is attached to the rear of the farm vehicle. A further hydraulic cylinder is connected between the support rack and the stationary brace. This further cylinder allows each boom to be tilted simultaneously to a closed position above the side windows of the cab of the vehicle when the booms are not in use.

Hydraulic device for controlling the perpendicularity of boom members in mobile platforms

Abstract: In connection with a pair of articulated booms there is a leveling system consisting of a sprocket wheel at the base of the lower boom and a co-acting sprocket wheel at the free end of the upper boom with chains and rods interconnecting the two sprockets and constituting part of the leveling system maintaining the basket connected to the free end of the upper boom in a level condition. The angular position of the sprocket wheel on the upper boom is calibrated so as to be in a direct relationship to the perpendicularity of the upper boom relative to the horizon, which in turn is related to chain movement at the upper boom. A control valve associated with the upper boom is actuated by a cam on the chain so the valve is operated at whatever preselected critical angle of perpendicularity of the upper boom is desired. The control valve, in turn, has fluid connections with power actuator means associated with each of the upper and lower booms to preclude further movement of either the upper or lower boom which would increase the perpendicularity of the upper boom beyond its critical predetermined amount. Fluid connections are provided to the power actuator means associated with the upper and lower booms to permit either or both of the booms to be actuated in a direction decreasing the perpendicularity of the upper boom from its critical position whether the control valve has been operated or not.

Telescoping aerial lift

Abstract: An aerial lift is described which has a pivotable boom with a load end and a pivot end. The boom is constructed such that, as the pivot end of the boom pivots upwardly, the load end is raised substantially vertically. In one embodiment, the boom is mounted on a telescoping scaffold to provide the boom with a greater reaching range. In another embodiment, the boom itself is provided with telescoping members to extend its vertical reach.

Front loader vehicle with telescoping boom

Abstract: A truck vehicle carried boom system for lifting, transporting, and depositing a load of particulate material such as powder, granules or seeds into storage bins in material dispensing aircraft, including a telescoping boom structure pivotally mounted on support structure which in turn is rigidly secured to the vehicle frame. The boom includes provision for removable carrying a hopper form of load bag. An extensible piston-cylinder hydraulic motor is utilized to obtain various pivotal positions of the boom. The boom telescope disposition is maintained by a mechanical safety pin. The boom is extended and retracted by inertial forces generated by vehicle manipulation. As an auxiliary device a boom safety bar, hydraulically operated is secured to a side portion of the truck bumper structure to provide a safety block when the boom is in the aircraft loading position.

Loading apparatus with extension boom (telescopic boom) and with hydraulic lines carried by the boom

Abstract: The disclosure relates to a loading apparatus comprising an outer boom and an extension boom (telescopic boom), wherein the C-shaped bight of the hydraulic line, which bight extends in a rearward direction longitudinally of the outer boom and the telescopic boom, is housed in its entirety in a space defined by the walls of the telescopic boom and the outer boom and so arranged that, in all positions of the C-bight at the movements of the bight during extension and retraction of the telescopic boom, the opposite parts of the loop in the area of transition to the C-bight are defined by two relatively fixed walls situated between adjoining surfaces of the telescopic boom and the outer boom.

Boom arrangement for dragline

Abstract: An excavating machine comprising a pivotal boom supporting at its outer end a drag bucket with the aid of a first line, and a bucket support arm articulated to the boom and a second line extending from said drag bucket to the outer end of the bucket support arm, whereby the drag bucket may be hauled close to the machine, irrespective of the height variations of the ground.

Crane winch for car recovery vehicle - has wheel support frames at end of hinged boom allowing extension of platform

Abstract: The rear of the vehicle recovery lorry is fitted with a crane boom (4) which lifts out of a flush setting in the load surface and swing upwards in a vertical plane. The end of the boom has a hinged extension with two side flaps (16) while double rollers at the end of the boom guide a winch cable (8). The winch enables the recovery team to pull cars out of ditches from either side of the road for pulling onto the lorry. The extension flaps can be used to lift the front wheels of further vehicles for towing away, so that two vehicles can be recovered at the same time. The flaps can also be raised into a vertical setting behind the load surface to prevent long vehicles from rolling off the load surface.

Support for sprayer booms

Abstract: A sprayer having an articulated boom is provided with a pair of shock absorbing structures mounted between the sprayer frame and the main section of the boom in such a manner that the main section is limited to dampened, rectilinear reciprocation relative to the frame. Each structure has a quick release mounting for permitting the boom to be easily removed from the sprayer and for facilitating adjustment of the nominal spacing between the ground and the boom.

Dynamic Behavior of a Load Lifted by a Mobile Construction-Type Crane : 4th Report, The Study on Boom Hoist Motion, etc.

Abstract: This paper deals with the behavior of a load lifted by a mobile crane during boom hoisting, and during boom hoisting and lowering which are executed at the same time. The equations of motion are given in the form of Lagrange's equation, and the solutions are obtained by Runge-Kutta-Gill method. In experiments the rope tension was measured with load cells, and displacements of the load and the boom point were measured with cameras and sound-wave. In conclusion, the theoretical analysis is verified, since the theoretical values are in good accord with the experimental values.

St. marys river ice booms - design force estimate and field measurements

Abstract: : A set of two ice booms with a 250-ft (76-m)-wide navigation opening between them was designed to stabilize the ice cover in the harbor at Sault Ste. Marie, Michigan and Ontario, and to reduce the ice losses associated with winter navigation of ships on the St. Marys River. The forces from natural effects on the ice cover were predicted using existing theory and physical data for the area. The forces in the boom structure resulting from ice cover and boom interaction were estimated. When the ice booms were installed, force measurement systems were put into selected anchor cables. These systems were operated all winter in conjunction with a modest program of supplemental data gathering. The force data exhibited periods when the force distribution was in good agreement with predictions and periods when the effect of the ice on the booms differed substantially from predictions. Sometimes passing ships had a substantial effect on the ice cover and the boom loads, and at other times, the effect was negligible. The direction of travel made little difference on average peak loads. The maximum loads on the booms resulted from natural occurrences.

Self-deploying boom

Abstract: A current deployable floatable boom unit for accumulating oil from the surface of water. An oil monitoring device is operative to actuate the deployment of the boom unit when oil is sensed adjacent to the boom unit, which boom unit is stored out of the way.

Hydraulic cylinder rod end fixity connector for telescopic crane booms

Abstract: A self-aligning and end fixity connector for connecting a hydraulic cylinder piston rod to its respective boom section in a multi-section telescopic boom assembly wherein the piston rod end is rigidly and fixedly secured to a structural part of one boom section. The cylinder barrel has a lost motion connection with a next adjacent boom section whereby slight movement in a vertical direction can occur between the cylinder barrel and said next adjacent boom section. The arrangement significantly increases the column loading capacity of telescoping crane boom hydraulic cylinders and reduces significantly the tendency for cylinders to bind with their piston rods due to inevitable cocking of boom sections.

Apparatus for preventing overrload of crane

Abstract: PURPOSE:A boom length and a boom angle of a crane are divided into M and N, respectively, and a rated characteristics for each combination is stored in a memory so that a rated characteristics to an actual boom length and an actual boom angle is approximated to the data read out from the memory and compared with an actual load.

Roof prop and platform movably mounted on boom of tunnelling machine

Abstract: A mineral mining machine of the type having a boom-mounted cutter assembly carried by a mobile base unit is provided with a face support structure which is pivotally mounted on the boom. Fluid operable rams are provided for moving the structure between a stowed position lying adjacent the boom and an operational face supporting position perpendicular to the longitudinal axis of the boom. The face support structure is brought into operation when it is desired to afford temporary support to a face of a ripping lip for example, in arch setting operations. In this latter respect, the boom also carries a stowable platform which can be opened out so that operatives may position themselves to handle arch sections which are elevated into position by a lifting mechanism also pivotally mounted on the boom.

Use of floating deflectors for oil spill control in fast flowing waters

Abstract: Although oil booms of various types now are available, it is well established that they are ineffective when the spill occurs in fast flowing waters A system was developed to control an oil spill under such circumstances The principle employed is to deflect the oil from where the spill takes place into a portion of the river where the currents are slower and the oil could be collected by conventional means This is achieved by a system of floating deflectors comprising a series of hydrofoils mounted on a horizontal frame anchored to the shore The interaction of the hydro dynamic forces on the hydrofoils creates an equilibrium state at which the system floats at an angle with the main current At this equilibrium state the deflectors induce a controlled spiral circulation which deflects the surface currents and spilled oil in a selected direction Experiments were conducted in a straight flume to study the characteristics of hydrofoils used as deflectors The general location of the several oil

Device for lifting crane boom

Abstract: A boom lifting system for a crane of the type having an upright mast and a boom hinged to the mast. The system has a brace extending between the mast and the boom. The brace is pivotally connected to both the mast and the boom and has a hinge dividing it into a short section, connected to the boom, and a long section, connected to the mast. A hydraulic cylinder is pivotally connected to both the boom and the short brace section. Actuation of the cylinder straightens or bends the brace to respectively lift or lower the boom relative to the mast.

Position responsive valve for controlling the retraction rate of a lower boom in an articulated boom assembly

Abstract: In an articulated boom having a platform and comprised of upper and lower booms respectively, there are hydraulic actuators controlling the movements of the upper and lower booms. Control means are necessary in association with the lower boom to control its rate of movement, slowing such rate of movement as the lower boom approaches its retracted, or full rest, position. A position responsive valve permits unimpeded fluid pressure access to the actuator for lowering the lower boom at its regular rate until the lower boom reaches a critical angle as it approaches horizontal position, at which time the valve prevents further fluid access to its associated hydraulic actuator. Thereafter, a position responsive valve and a pressure reducing valve reduce the rate of descent of the lower boom until the lower boom is fully retracted to its rest position. The described hydraulic control is in a single package which can be retrofitted into existing hydraulic systems and is independent of the pilot operated check valve and cylinder, being located between the main control valve and the power cylinder and does not interfere with existing hydraulic controls.

Selfftravelling crane falllpreventing device

Abstract: PURPOSE:To prevent a self-travelling crane from falling back by designing it so that its boom becomes able becomes able to be raised only after its out-rigger jack is securely grounded.