Abstract: Mounted on a vehicle (10), the mast (20) of a boring rig is supported by an erection hinge (18). The erection hinge (18) is provided on a first carriage (19) having a support cylinder attached (28) to it for the purpose of support and erection of the mast (20). The hydraulic erection cylinder (24), attached to the vehicle (10), is connected to the second carriage (21). The mast (20) is extended to an oblique angle by the hydraulic erection cylinder (24). The final phase of the erection of the mast (20) is completed by the retraction of the secondary take-in cylinder (27), which connects the two carriages together. When in a horizontal position, the mast (20) can be guided in a longitudinal direction in order to have a more favorable position of the center of gravity on the vehicle (10).

Abstract: A device raises and aligns a tiltable telescopic mast which is mounted on a transport vehicle and which can be raised by one or more lifting cylinders from a horizontal or almost horizontal transport position in a vertical plane parallel to the longitudinal axis of the transport vehicle up to a vertical position of the mast in this plane. Vertically adjustable support booms brace the telescopic mast on the ground in a vertical plane transverse to the longitudinal axis of the transport vehicle. The device includes a supporting frame for the telescopic mast and which is connected to the vehicle frame so as to be vertically adjustable three lifting elements, and four support booms that are mounted on the supporting frame and each of which can be lowered and swung out by actuating only one pull device.

Abstract: A column is attached at a base flange to a plate of a base member by way of an offset horizontal pivot, and can be pivotally raised and lowered by means of a ram. The pivot lies in the general plane of the flange and the plate so that, when the column is fully lowered, the overall height of the unit in the region of the base member is little more than the length of the flange.

Abstract: A hydraulic setting tool assembly for setting earth anchor and foundation devices comprising side-by-side hydraulic motive members. Each motive members comprises a piston movable within a cylinder. The piston has a piston arm extending out of the cylinder. Movement of a piston under the pressure of hydraulic fluid causes the associated piston arm to extend from or retract into its associated cylinder. A piston arm bearing plate is secured to the extended ends of the piston arms. A cylinder bearing plate is secured to the base of the cylinders. The bearing plates are parallel to each other and an opening is provided in each of the plates midway between the motors so that said openings are aligned for the passage of a threaded rod therethrough. An adjustable nut on the rod restrains one of the bearing plates against movement along the rod while the other bearing plate can move relative to the rod to force an earth anchor or foundation device into the earth.

Abstract: The present invention deals with a new hoisting and supporting machine used for supporting and lifting loads from the base level to different levels. The machine is essentially an air and water crane which is a combination of water pressure together with uplifting buoyancy forces acting directly or indirectly on the top platform of the hoisting machine. It consists generally of an outer upright water retaining telescopic column and an inner upright air filled floating telescopic column, which develops the buoyancy forces that lift up and support the top platform of the unit. When used in sub-zero temperature, the unit is provided with means to prevent the water, inside the column, from freezing, while for severe arctic low temperatures the unit is converted into an all ice column with provisions to accommodate the expanding ice inside the columns, resulting in an ice pillar acting like a concrete pillar to support the top platform of the unit with its loads.

Abstract: In the construction of tall concrete towers, a two part derrick is suspended by cables from the tower to the lower part of the derrick. The derrick is extended on hydraulic rams, raising its upper part and outside casting forms. A pulley system maintains a deck scaffold and inside forms at their original level during extension. Extension of the derrick slakens cables from the tower to the upper part of the derrick. These cables are disconnected from the tower and reconnected at a higher level. Outside forms are fixed, reinforcing steel set in place, and the derrick retracted, raising the deck scaffold and inside forms by the pulley system, and slacking the lower cables. The lower cables are disconnected from the tower and reconnected at a higher level. Inside forms are set and concrete is poured. The concrete sets and the procedure is repeated.The deck scaffold comprises radiating wooden beams with endpieces.

Abstract: Method and apparatus for extending a fly section of a telescopic crane boom which fly section does not have its own power unit to effect extension or retraction. The boom includes a base section, an inner powered section telescoping within the base section, an outer powered section telescoping within the inner section, and a non-self-powered fly section telescoping within the outer section. To extend the fly section, a load pin connecting the fly section to the outer section is released using a hydraulic cylinder mounted to the base section. The load pin is locked in the released position by a locking device. The outer section is then extended, taking the fly section with it. Upon full extension of the outer section, the inner end of the fly section is latched to the inner section or base section by latch pins actuated by a hydraulic cylinder. The outer section is then retracted, exposing the fly section and unlocking the load pin from its released position.

Abstract: A telescopic boom assembly is disclosed. The assembly includes a plurality of boom members having at least first, second and third boom arms telescopically disposed within each other. The first boom arm is connected to a support base. A mechanism is provided for axially extending the second and third boom arms outwardly from the first boom arm, the third boom arm being constructed from dielectric material and disposed at the distal end of the assembly once the assembly is in a fully extended position. Finally, an end cylinder structure constructed from dielectric material is provided for axially moving the third boom arm relative to the first and second boom arms such that the third boom arm and the end cylinder structure dielectrically insulate the distal end of the third boom arm from the remainder of the boom assembly when the assembly is in an extended condition.

Abstract: A locking assembly (35) for telescoping masts (10) having at least first and second tubes (12,13), the second tube (13) fitting within the first tube (12). The assembly includes sleeve means (36) encompassing one end (59) of the second tube (13) and rigidly affixed thereto, cap means (58) affixed to the second tube (13) below the sleeve means (36) forming an air tight seal within the first tube (12), stop ring means (38) carried above the sleeve means (36) and encompassing the second tube (13), recess means (68) formed by the sleeve means (36) and the stop ring means (38) and locking collar means (20) rigidly affixed to a first end (43) of the first tube (12) providing at least one movable member (76) engageable with the recess means (68).

Abstract: 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 section of the telescoping boom. To enable the crane operator to know with certainty that the biased locking pin is in a fully engaged position, a visual indicator on the boom readily viewable from the crane operator's cab is directly mechanically linked to the biased locking pin and moves to the indicating position only when the locking pin is fully engaged.

Abstract: A guide mat for a slant service or drill rig. The guide mat comprises rearward and forward portions and an open area in the rearward portion which is used to allow access to a wellhead. Adjustable pedestals are provided which move in orthogonal planes to the plane of the guide mat and thereby allow for convenient pinning of the mast of the rig to the mat such that the mast is maintained in its correct operating position while the drilling and/or service operations are underway.

Abstract: In a truck mounted overcenter aerial device having an articulating boom assembly, a mechanism for articulating the upper boom relative to the lower boom. A star wheel on the upper boom is acted upon by a pair of linkages powered by hydraulic cylinders mounted on the lower boom. The linkages are pinned at their outer ends to the star wheel so that the upper boom is pivoted in opposite directions when the cylinders are extended and retracted. Each linkage includes pivotally connected links which fold up on the star wheel against stop surfaces as the linkage is extended. The stop surfaces are arranged to control the angular speed of the upper boom and the torque applied to it by the linkages as desired during each angular segment of articulation. The hydraulic control circuit for the cylinders includes counterbalance holding valves which maintain both linkages under tension at all times to avoid any slack or jerkiness when the boom goes overcenter.

Abstract: Method and apparatus for raising and lowering a telescoping mast. A telescoping mast having an upper section slidably received within a lower section is pivotally connected to a base in a horizontal position. A line is connected to the lower end of the upper section and is placed over a pulley mounted on the upper end of the lower section and secured to the base. Upward pivoting of the lower section moves the mast to a vertical position while the upper section is extended by action of the line. Lowering the mast from the vertical position causes contraction of the upper section into the lower section.

Abstract: A telescoping mast assembly for floodlighting equipment or other apparatus is arranged to be raised by admitting pressurized fluid to the interior of the assembly and lowered by releasing the fluid. The assembly is constructed of light metal, such as aluminum alloy, and includes a plurality of telescoping hollow members, or tubes, each inner member having a pair of substantially spaced wear rings near its lower end for maintaining the spaced positions of the members and a fitting at its outer end carrying an internally mounted wear ring for maintaining the spacing at the outer end. The telescoping members do not engage one another but are spaced by the wear rings. The fitting is readily detachable and facilitates the use of straight lengths of standard aluminum tube stock for the mast sections. The fittings include keys slidably engaging longitudinal slots in the members for preventing rotation of the members with respect to one another. Seals are provided for preventing leakage of fluid between the members.

Abstract: A raising mechanism for drilling equipment towers mounted on a platform and having two pairs of linkage members, one shorter than the other one, each pair having its members connected on one end to each other and to the underside of the tower at spaced apart points. A cylinder is designed to vary the angle between the tower and the linkage members thereby causing the tower to move from a substantially horizontal position to a vertical position, or if desired, to a forward inclined position by the use of removable wedge elements.

Abstract: A multi-section hydraulically operated telescoping crane boom includes a manual fly section (23) which may be safely extended and retracted, securely latched in the extended position and pin locked by remote operation of a biased hydraulically powered latching plunger (33) and a biased cooperative hydraulically powered locking pin (52) both embodied in a static hydraulic circuit which includes in one form a pressure fluid circuit safety interlock portion (FIG. 4) with a pressure-responsive indicator (123) to indicate when the latching plunger (33) is engaged (48), and in another form an electrical switch circuit safety interlock portion (FIG. 7) controlling the hydraulic circuit, with an electric switch (131) operated indicator (159) to indicate when the latching plunger (33) is engaged (48). The safety interlock portions of both circuits for the cooperative latching plunger (33) and locking pin (52) prevent their operation in improper sequence so one is engaged at all times before the other is disengaged.

Abstract: A telescopic boom is disclosed having a plurality of generally tubular boom sections each having its corners defined by angled corner plates converging upwardly and inwardly at equal angles relative to a central vertical plane containing the longitudinal axes of all boom sections when properly aligned. Boom shoes secured to the outer surfaces and near the inner ends of the angled corner plates of all boom sections except the largest section slidably engaging the adjacent angled corner plates of the next larger boom section; and similar boom shoes secured to the inner surfaces of the angled corner plates near the outer end of all boom sections except the smallest section slidably engaging the outer angled surfaces of the next smaller section.

Abstract: An articulated aerial boom and an elbow linkage therefore permitting the proximal end of the upper aerial boom to rotate approximately 210.degree. about the proximal end of a lower aerial boom.

Abstract: An improved, high strength extensible crane boom is provided which has a plurality of elongated, tubular, telescopically interfitted, longitudinally bowed, prestressed boom sections, along with a low cost method of fabricating the respective boom sections. Each boom section preferably includes an elongated upper plate having a channel structure welded to the underside thereof to form a polygonal body; permanent bowing of the body is accomplished as an incident to the welding sequence by virtue of asymmetrical heating and subsequent cooling of the metallic boom components. The boom sections are advantageously pentagonal in cross section, and the separate sides of the channel structures are simultaneously welded to the upper plates to evenly heat the plates and minimize torsional distortion of the sections.

Abstract: A multi-section hydraulically operated telescoping crane boom includes a manual fly section which may be safely extended and retracted, securely latched in the extended position and pin locked by remote operation of a biased hydraulically powered latching plunger and a biased cooperative hydraulically powered locking pin both embodied in a static pressure hydraulic circuit which includes a pressure-responsive indicator to indicate when the latching plunger is engaged. The circuit also includes safety interlocks for the cooperative latching plunger and locking pin preventing their operation in improper sequence.

Abstract: A stabilizer for a telescoping cylinder and rod is disclosed. The stabilizer includes a support body which carries a cylinder rod encircling clamp and a bell crank. The support body and bell crank are moved along a support track by operation of the cylinder. As the cylinder structure reaches its full extension, the stabilizer is deployed to clamp and stabilize the cylinder rod and cylinder assembly at a joint generally equidistant the ends of the cylinder and rod assembly. The stabilizer is actuated automatically by the extension of the cylinder and is returned to its initial position as the cylinder is retracted. The telescoping cylinder stabilizer provides support for the elongated cylinder and protects the cylinder and rod from damage due to flexure and bending which might occur were it not for the stabilizer.

Abstract: A telescopic boom arrangement comprises an innermost member, a plurality of intermediate tubular sections 12, and an outermost tubular member, each nested together, the arrangement being adapted so that sequential erection of the members from a stowed position is ensured, commencing with the innermost member, progressing with the next outer member and so on. Each intermediate member includes latching means 24 which serve both to lock the next inner member in a stowed position and to lock that member in an extended position. Unlatching of the latch means 24 of an intermediate member to allow extension of the next inner member is effected by fingers 23 on the next-but-one inner member when that member approaches its extended position. When the next inner member reaches its extended position, it is locked by means of latching means 24 engaging slot 25.

Abstract: A support structure for devices particularly life boats and similar apparatus which is weight operated comprises a plurality of support members, each or some of which may be telescopic which are pivotally interconnected adjacent their associated interconnected ends. Each successive upper one of a pair of such members is pivotal relative to the next adjacent lowermost one about a substantially horizontal axis. The pivoting is controlled by a control mechanism which is operated from a fluid pressure source produced by the weight of the elements upon each other. The control mechanism includes means for controlling the amount of tilt of each upper element relative to an adjacent lower element and for the control of the precise angularity of the two elements relative to each other during the pivotal movement.

Abstract: In combination with a telescoping well mast structure having a fixed lower structure and a traveling upper structure, a device to time and actuate the extension and retraction of a racking platform pivotally attached to the upper structure. The device comprises at least one pulley secured within the upper derrick structure adjacent the crown and at least one lower pulley secured within the upper structure adjacent the lower end thereof. At least one cable extends from the platform around the upper pulley, the lower pulley and to a wheeled trolley adapted to travel along a portion of the lower structure. When the upper structure is extended the wheeled trolley is propelled along the lower structure by a pushing member on the upper structure until received into a catch housing on the upper portion of the lower structure. Once the wheeled trolley is restrained by the housing continued extension of the upper structure allows for the racking platform to extend by means of gravity.

Abstract: An arrangement for keeping taut and untangled the hoses of the hydraulic system of the telescoping booms of a crane includes a wheel around which the hose is trained and a cable by which the hose can be stretched and pretensioned so that the resiliency of the hose itself maintains the conformity of the hose to the wheel.

Abstract: This invention concerns a drilling installation comprising a base which rests on the ground, a rig, a winch, items of equipment such as a drill-pipe storage coffer, and a working floor which is raised above the base, surrounding the rig.The installation is characterized by the fact that it comprises a carrying platform designed to take the rig, and which can be moved from a low position in contact with the base to a high position, and which is connected by a suitable lifting device to lifting uprights attached to the base. The platform also carries the working floor and items of equipment.The invention more specifically concerns drilling installations for oil-drilling operations.

Abstract: The mobile drilling machine includes a full track or wheeled undercarriage, a drilling mast provided with first guiding tracks extending in the longitudinal direction of the mast for guiding a rotary turntable for drilling pipes and with second guiding tracks, a slider movable on the second guiding tracks, a short supporting arm hinged between the undercarriage and a lower part of the mast, a longer supporting arm hinged at a different point on the undercarriage and connected by a universal joint to the slider and a self-locking driving mechanism provided on the slider to engage a tooth rack or chain mounted on the slider to adjust the inclination of the mast when actuated.

Abstract: The invention relates to a self-assembling telescopable structure comprising a plurality of members which can be slipped and unslipped into and from each other. For the assemblage and disassembling of the structure releasable fastening members are provided for the several component parts and reversible lifting means acting between the internal component part and its next intermediary component part.By outstretching such means it is possible to effect the unslipping of the internal component part from its next. By subsequently fastening the internal component to the external one or to an intermediate component and binding mutually the other intermediate components, it becomes possible, by contraction of said lifting means to have the mutually bound intermediate components into the unslipped internal component part. By repeating these steps, the structure is assembled, whereas, by reverting the step sequence the disassembling of the structure is obtained.

Abstract: A vertically elongated frame is provided including pairs of opposite sides and each opposite side includes a pair of upstanding opposite side guides. First, second and third pairs of upper, intermediate and lower hydraulic cylinders are provided on each frame side and the lower portion of each upper cylinder lower portion is communicated with the upper portion of the next lower cylinder upper portion whereby fluid pressure in all of the cylinders is maintained equal and the cylinders may extend in sequence with the upper cylinders extending first, the intermediate cylinders extending second and the lower cylinders extending last. Further, the equalization of the fluid pressures within the cylinders also enables the cylinders to retract in sequence with the lower cylinders retracting first, the intermediate cylinders retracting second and the upper cylinders retracting third.

Abstract: A hydraulic elevator system which utilizes a single hydraulic jack having a cylinder fixed below an elevator car, and a plunger. The elevator car is supported on the end of the plunger. The hydraulic jack extends upwardly and into the elevator car, reducing the space required below the car by the amount of the penetration of the hydraulic jack. The hydraulic jack is disposed adjacent to the front portion of the hatchway, enabling it to occupy an enclosed, concealed space in the elevator car, between its entranceway and its operational controls.

Abstract: A telescopic, mobile crane comprising, a first base member pivotally mounted on a carriage, a second telescopic member telescopically engaged with the first member, an idle or manual member telescopically engaged to the second member and a drive piston and cylinder unit connected between the first and second members for extending the second member from the first member. An arresting apparatus is connected between the piston and cylinder arrangement and the idle member for extending the idle member. When the idle member is extended, the first and second members are locked to each other by a pawl and pin arrangement and the second member is disengaged from the piston and cylinder arrangement. After the idle member is extended, the first and second members are unlocked from each other to permit the extension of the second member.

Abstract: To reduce the weight and increase the lifting capacity of a multi-section telescopic crane boom, a single hydraulic cylinder for the full extension and retraction of individual boom sections is anchored in the relatively stationary boom base section. A sled structure surrounding the single cylinder and moving therewith has guided engagement through plates fixed to the movable boom sections at or near their rear ends. Driving finger mechanisms on opposite sides of the sled are biased toward driving engagement with the plates of the movable boom sections and are retractable into chambers of the sled. A cooperative locking pin operating assembly for the movable boom sections is fixed on the forward end of the boom base section and includes power retracting devices which operate mating retracting cranks and locking pin sets individual to the movable boom sections when the retracting cranks are aligned beneath the power retracting devices.

Abstract: A mobile apparatus (20) has a hydraulically operated pivoted boom (22) and a hydraulically operated pivoted arm (24) and on the free end of the arm is a hydraulically operated mechanism (26) for handling heavy loads in ways that cause torsional and bending distortion of the boom (22) and the arm (24). Coplanar steel hydraulic conduits (42a and 42b, and 45a and b to 50a and b) are slidably carried in conduit support blocks (57); and those blocks in turn are mounted on brackets (53) fixed to the arm (24) or brackets (69) fixed to the boom (22) by carrying means (56 or 72) which allows directionally unrestricted limited movement of the blocks (57) in a plane parallel to that of the conduit centers, and which also allows axial movement along lines perpendicular to that plane.

Abstract: The invention relates to a power arm comprising four faces, two of which being constituted by plates, which arm is mounted for pivotment about an axis and with respect to a structure, and is fitted with the coupling lug of a jack comprising a pivoting axis of said jack and its support, permitting a deflection of said jack which is parallel to the deflection of the arm, said support being constituted by extended portions of the plates.The arm comprises a cross piece of which the length 1 is substantially equal to the spacing between the said extended portions and which is situated between the said extended portions, and transversed by the axis, a threaded end of which cooperates with a nut to hold the cross piece in position between the said extended portions.An application is found in the production of a shovel boom.

Abstract: A portable workover rig for handling a pipe string in a well casing includes a base platform and a collapsible mast which is movable from a reclining transport position to an erect elevated position of use. The mast is supported for free-standing operation by a carriage assembly including a cantilever support base mounted on the base platform for pivotal movement from the transport position to the position of use. The carriage assembly includes lift arms coupled in parallel relation intermediate the cantilever support base and the rig support platform for maintaining the cantilever support base in parallel alignment with the base platform. Hoisting and snubbing operations are performed by drawworks including a linear hydraulic actuator carried on the base platform, a traveling block supported for vertical movement along the mast by hoist and snub cables, and traveling sheaves carried by the actuator through a stroke pathway which is oriented transversely with respect to the mast.

Abstract: A telescopic jib of a load-handling device, having telescopically extensible sections in the form of fluid cylinders. An annular sealing assembly is employed at the end portions of the sections, in the form of a sleeve which defines an annular space with the end face of the fluid cylinder of greater diameter and the side surface of the fluid cylinder of smaller diameter. A floating ring is mounted in the annular space and has seals which engage the external periphery of said smaller-diameter fluid cylinder and the end faces of the floating ring. Annular grooves are coaxial in the external peripheral surface at the end of each said fluid cylinder and in the end face of the respective one of said sleeves such that, a support ring is accommodated in each pair of annular grooves. A rope-and-sheave system having at least two runs symmetrically extending with respect of the longitudinal axis of the jib is used to govern the motion of the sections.

Abstract: A new and improved portable hydraulic rig for performing workover, drilling or other operations on a well, usually a petroleum well, wherein the rig has a telescoping mast for telescoping to a reduced length for transportation, wherein the mast is cantilevered in use so that the travelling block moves vertically at one side of the mast, wherein the cable for the travelling block is reeved over the various sheaves including a sheaves on a hydraulic power assembly with the dead end of the line being fastened at or in proximity to the rig floor for balanced loading on the legs of the mast and to enable slack in the cables to be taken up when telescoping the mast.

Abstract: A mobile apparatus (20) has a pivoted boom (22), and hydraulic cylinders (23a and 23b) flank the boom for moving it about its pivotal mounting (22a). Head end conduits (31a and 31b) and rod end conduits (33a and 33b) which connect the cylinders to a hydraulic pressure source are protected by guard means (35) including a unitary, rigid guard member (38) which is mounted upon the cylinders (23a and 23b) by mounting means (41) which affords limited movement of the guard member (38) relative to the cylinders (23a and 23b) in the plane of a central guard plate (39) and axially of mounting bolts (48).

Abstract: PCT No. PCT/US79/00501 SEC. 371 Date July 16, 1979 SEC. 102(e) Date July 16, 1979 PCT Filed July 16, 1979A mobile apparatus (20) has a hydraulically operated pivoted boom (22) and a hydraulically operated pivoted arm (24) and on the free end of the arm is a hydraulically operated mechanism (26) for handling heavy loads in ways that cause torsional and bending distortion of the boom (22) and the arm (24). Coplanar steel hydraulic conduits (42a and 42b, and 45a and b to 50a and b) are slidably carried in conduit support blocks (57); and those blocks in turn are mounted on brackets (53) fixed to the arm (24) or brackets (69) fixed to the boom (22) by carrying means (56 or 72) which allows directionally unrestricted limited movement of the blocks (57) in a plane parallel to that of the conduit centers, and which also allows axial movement along lines perpendicular to that plane.

Abstract: A telescopic boom is pivotally mounted on a frame of a vehicle and comprises telescopically disposed first, second, third and fourth sections. A double-acting cylinder has a rod thereof connected to the first section and a housing thereof connected to the second section. A first pulley is rotatably mounted on a forward end of the cylinder housing and a second pulley, having a larger diameter than the first pulley, is rotatably mounted on a rearward end of the cylinder housing. A first end of a cable is secured to the first section and is sequentially entrained over the first pulley, secured to the third section, entrained over the second pulley and has a second end thereof secured to a forward end of the first section. Thus, extension of the cylinder will function to extend the second section relative to the first section and simultaneously extend the third section at twice the linear speed as that of the second section.

Abstract: A casing for hydraulic lifts and the like of the type buried in the ground. The part of the casing deeply buried in the ground may be subject to corrosion and electrolysis, which is quite common in many soils, and is made from a strong, fiberglas composite material. The part of the casing not subject to corrosion is metallic. Flanges connect the two parts in end-to-end sealed relation with respect to each other and the seals and guides for the plunger are carried in the metallic part of the casing. A non-metallic bulkhead is bonded to the bottom of the fiberglas composite casing and may have a port opening through its bottom wherein the lift is a semi-hydraulic lift as is common with passenger car lifts.

Abstract: A telescoping boom lift apparatus having a first boom mounted about a first substantially fixed horizontal pivot axis in a mobile base for vertically pivotable movement with respect thereto and further having a second boom member carried by, and received in, the first boom member is provided with a link secured between a second substantially fixed horizontal pivot axis on the mobile base and a third horizontal pivot axis on the second boom member whereby, when the first boom is rotated through an increasing included vertical angle, the third pivot axis on the second boom member is moved therewith longitudinally of the first boom member and away from the first horizontal axis thereby reciprocating the second boom member along a portion of the length of the first boom member to cause the distal end of the second boom member to increasingly extend beyond the first boom member.

Abstract: A shovel linkage for a hydraulic excavator includes boom rails having pivot means in one end for pivotal connection to an excavator and cross tubes extending between the rails near the pivot means and having pivot joints provided thereon for connection of actuating cylinders for the linkage in line with the cross tube and close to the pivot means whereby forces imparted to the linkage by the actuating cylinders will be directly through the center of the cross tube and very near the boom rail pivot means, minimizing bending moments in the linkage.The pivot joint includes a flat tab member provided on the cross tube and projecting outwardly along a diameter thereof, and a pin and ball connecting the bifurcated end of a hydraulic cylinder to the tab for limited rotation thereof. The pin is disposed substantially normal to the plane of the boom rails for unimpeded insertion and removal thereof.

Abstract: An aerial device includes a boom support structure, a boom pivotally secured to the support structure, and first and second boom lift hydraulic actuators. The first and second boom lift hydraulic actuators are operated in tandem to raise, lower, and hold the boom in position. The first and second boom lift hydraulic actuators are pivotally connected between the boom support structure and the boom and are disposed with respect to the boom pivot axis so that regardless of boom position, one of the first and second actuators is under tension and the other is under compression. This eliminates the danger of loss of lift of the boom caused by end gland failure of a lift actuator.

Abstract: An extensible boom, which comprises a first part which is pivotally anchored to a rotatable pedestal so that the boom may be raised or lowered. A second part of smaller lateral dimension is adapted to slide within the first part. The outer end of the second part carries a crown, with at least two crown sheaves. On the inner end of the second part there are two pulleys having transverse vertical pins about which they rotate. On the outer end of the first part there is a third pulley having a shaft substantially horizontal. A conventional cable drum is supported on the pedestal with conventional drive means. The cable spools from the drum over one of the crown shafts down to a travelling block and hook and is arranged over said pulleys in a manner such that when there is a weight hanging on the hook, there will be a force tending to extrude the second part out of the first part, unless it is held back by a tension member.

Abstract: A shovel linkage for a hydraulic excavator or the like has spaced parallel boom link rails which are coplanar with associated spaced parallel stick link rails and pivotedly connected thereto by means of pivot joints provided on the ends thereof.Bucket stops are provided on a bucket attached to the stick and are arranged to contact the centers of the stick rails for greater strength.

Abstract: An improved joint and method of providing such a joint between the upper and lower portions of a rotatably driven crane post, comprising a sleeve-shaped member formed internally with screw threads and provided at the lower end of the upper position, a pin provided at the upper part of the lower post portion and formed externally with screw threads matching the sleeve member threads, and a collar on the lower post portion below the pin against which collar the sleeve-shaped member is pressed upon screwing together of the lower and upper post portions to form said joint.

Abstract: Erection means for a transport trailer which hauls an elongated object of relatively large cross-section in horizontal position and then with the aid of hydraulic jacks stands the object erectly on a preformed foundation.

Abstract: A multi-section telescopic jib or boom comprising a base section and three movable sections mounted to extend or retract relative to each other on operation of drive means within the sections, including a first ram connected between the base section and the innermost sections, a second ram connected between the innermost and central sections and a chain having ends connected between the innermost section or the first ram and engaging a chain wheel mounted on the central section or second ram, means being provided to releasably connect the chain to the outermost section to extend the boom.

Abstract: A multi-section telescopic jib or boom comprising a base section and three movable sections mounted to extend or retract relative to each other on operation of drive means within the sections, including a first ram connected between the base section and the innermost sections, a second ram connected between the innermost and central sections and a chain having .[.ends connected between the innermost section or the first ram.]. .Iadd.one end connected to the lowermost section or first ram and the other end connected to the innermost section .Iaddend.and engaging a chain wheel mounted on the central section or second ram, means being provided to releasably connect the chain to the outermost section to extend the boom.