Abstract: A first elongated support member is provided and includes second large and small outside cross-sectional area end portions. A cylinder member is provided and includes large and small end portions sealingly and slidingly engaged with the large and small diameter end portions, respectively, of the first support member and defining a peripheral expansion chamber between the support member and the second cylinder member. Structure is provided operative to admit and evacuate fluid under pressure to and from the expansion chamber. A third cylinder member is provided including base and far ends sealingly and slidingly engaged with the large and small end portions of the second cylinder member and with a peripheral expansion zone being defined between the second cylinder member and the third cylinder member between the base and far ends portions of the third cylinder member. Further, structure is provided establishing communication between the expansion chamber and the expansion zone.

Abstract: Installation and maintenance equipment to tension a fabric sleeve filter supported from a bag support frame in a baghouse by a retainer rod and a tensioning spring. A tensioning tool is configured to be removably coupled to the retainer rod while compressing the tensioning spring to pull taut the fabric sleeve. A speed control regulates the speed at which the spring is compressed and a regulator determines the force applied to the spring. A pneumatic, hydraulic or electromechanical power source supplies the tensioning force.

Abstract: A telescoping jack having a cylinder and a plurality of coaxial tubular elements mounted within the cylinder, the elements being movable between a retracted position where they are nested within the cylinder and an advanced position. Each pair of adjacent tubular elements has two pairs of cooperating annular recesses on their inner and outer surfaces which pairs of recesses cooperate, in combination with an elastic ring, to limit the outward movement of an inner tubular element relative to its adjacent outer element.

Abstract: A hydraulic jack having a piston and a cylinder in which the piston has at its head a cavity the dimensions of the cavity and the constructional materials of the cylinder and the piston being selected so that hydraulic pressure applied within the cylinder acts to deform the cylinder wall and the parts of the piston defining the cavity in such a manner that, over the normal rate of operating pressures of the jack the clearance between the piston and the cylinder remains within the capacity of the sealing means arranged between the piston and the cylinder to provide an effective seal.

Abstract: Apparatus for converting the pushing action of a hydraulic piston-cylinder assembly to a pulling action. First and second substantially parallel rails are connected together adjacent to first ends thereof, and the rails are attached to a stationary reference object. First and second substantially parallel bars are connected together by guide means, and the guide means are in operative relationship with the bars and the rails for slidably positioning and guiding the first rail and the first bar in face-to-face relationship with respect to each other and for slidably positioning and guiding the second rail and the second bar in face-to-face relationship with respect to each other. Piston-cylinder assembly receiving means are in operative relationship with the rails and the bars for receiving and supporting a conventional piston-cylinder assembly and for enabling the rails and bars to move relative to one another to shorten the combined length of the apparatus.

Abstract: There are disclosed two embodiments of a trench shoring device of the type having rails which are forced against the sides of the trench by one or more fluid actuated, extendible and retractible braces connected to and extending between the rails. In one embodiment, the rails extend vertically within the trench, and the opposite ends of the braces are so connected to the vertical rails that they may be swung folded positions during lowering into and raising from the trench. In another embodiment of the invention, the rails extend horizontally of the trench, and the ends of the braces are connected thereto in such a manner as to prevent substantial movement of the braces out of perpendicular positions with respect to the rails.

Abstract: A hand tool, for use with a hydraulic pump, for forcing or prying open doors and other objects. First and second jaw members, each having spaced apart fingers, are connected together by a hydraulic piston-cylinder assembly which is adapted for hydraulic connection to the hydraulic pump. The spaced apart fingers of the jaw members mesh with each other when the jaw members are positioned together. A plate member defining opposed sides is connected to the first jaw member and the second jaw member defines first and second guide members with each of the guide members projecting adjacent respective sides of the plate member and in slidable relationship with the plate member. A third guide member extends from the plate member and encircles a portion of the piston-cylinder assembly in slidable relationship with the assembly.

Abstract: A belt tensioning tool for tensioning an endless belt that passes around a plurality of spaced apart pulleys with one of the pulleys being mounted for adjustable movement relative to the other pulleys. The belt tensioning tool has as its basic components an actuator assembly including an extensible rod member, a reaction assembly mounted to one end of the actuator assembly, and a slidable assembly mounted to the extensible rod member. The reaction assembly includes a reaction arm member which extends in a cantilevered fashion away from the extensible rod end of the actuator assembly. Similarly, the slidable assembly includes a cantilevered, slidable arm member which is mounted to the extensible rod member and is slidably movable along a track in the reaction arm member. The reaction arm member and slidable arm member include opposed adapter members having pulley engaging ends that extend in opposite directions.

Abstract: A hydraulically driven platform lift, loading or tipping platform or the like, having a platform carrying the load and capable of being raised and lowered or tilted by means of at least one hydraulic working cylinder and-depending on the apparatus structure-a lever system, particularly a scissor-type lever system or the like, wherein switching elements for the supply and removal of hydraulic fluid to or from the working cylinder are located in the hydraulic circuit, and the hydraulic working cylinder or cylinders or one of the hydraulic lines connected therewith is connected by a line containing a shut-off or switch-over element, with a measuring device and indicator for determining and indicating the weight of a load resting on the platform.

Abstract: A device for tensioning reinforcing strands in concrete structures comprises a cylinder and a cooperating piston and is provided with means for supplying a pressure gas obtained by the combustion of powder or some similar compound. The device may be arranged so either the piston or the cylinder is movable, and by selecting the size and the composition of the powder charge it will be possible to use the device for an initial tensioning, usually performed in a number of steps, as well as for a final jerk. The device may be provided with an accumulator, at which the combustion occurs, the device being provided with means for permitting, at will, the gas from the accumulator to act upon the piston.

Abstract: A device enabling movement of an electrical conductor through a string of insulators coupled between a supporting tower and a yoke plate. An upper frame having clamping jaws for engaging one of the insulators is pivotally mounted to a lower frame connectable to the yoke plate. A hydraulic cylinder causes the frames to rotate relative to each other, to relieve stress on the lower portion of the insulator string, so that it can be uncoupled to permit movement of the conductor through it.

Abstract: A hydraulic cylinder comprising a hydraulically operated power lifting ram for lifting heavy loads further includes a guide cylinder concentric about and enclosing the ram, the guide cylinder being secured to the lift platform for further support of the load and reciprocating in unison with the ram under application of hydraulic pressure. The guide cylinder is equipped with a safety locking means which prevents the hydraulic cylinder and its load from lowering in the event of a sudden loss in hydraulic pressure. The safety locking means is in contact with the guide cylinder substantially during the full stroke of the hydraulic operated ram, providing a unique method of locking the cylinder in any position within tolerances normally associated with gear driven devices.

Abstract: A fluid pressure operable jacking tool having oppositely disposed locking arms. With the draft key and coupler removed, the locking arms of the jacking tool, when installed, biasingly engage the coupler cross key slots formed in the draft gear yoke, so that a fluid pressure powered ram of the jacking tool abuts against the draft gear follower. A fluid pressure line is connected to the jacking tool and, when provided with fluid pressure, causes the jacking tool ram head to compress the draft gear to allow removal of the draft gear and jacking tool from the car center sill together. Once removed, pressure is released from the jacking tool to permit separation thereof from the draft gear. If the draft gear is to be installed, a reverse procedure would be employed.

Abstract: The invention relates to a telescopic elevator device for dollies comprising in combination a wheel-mounted base member, a first extension member telescopically slidable on the base member, a second extension member telescopically mounted within the first extension member and apparatus for controlling the contemporaneous sliding of the extension members with respect to the base with a different speed so that the second extension member has a sliding speed which is the double of the first one.

Abstract: A hydraulic network interconnects a pump with one or more hydraulic jacks, the jacks being arranged at the ends of parallel segments of the hydraulic network, each segment including a safety check valve for isolating the respective jack of such segment from the remaining portions of the hydraulic network including the pump. The jack or jacks in the system are installed in the backcut of a tree so that forceably extending the ram of each such jack will cause the tree to be felled in the desired direction. Each safety check valve includes a camming surface which can be manually positioned in the absence of a substantial load on the respective jack to override the normal automatic operation of the valve thereby maintaining the valve open to allow fluid to return from the respective jack through the valve when it is desired to collapse the jack after the tree has been felled.

Abstract: A sleeve is provided for snug reception through a bore in a floor slab and an elongated shank is provided for snug sliding reception through the sleeve with the opposite ends of the shank projecting outwardly from the corresponding ends of the sleeve. One end of the sleeve is provided with an enlargement thereon tapering toward the other end of the shank and the maximum diameter of the enlargement is less than the outside diameter of the sleeve. The enlargement includes a minor diameter end which may be wedgingly received within the adjacent end of the sleeve and the enlargement includes circumferentially spaced, radially outwardly tapering and longitudinally extending flutes formed thereon. The flutes are spiraled, slightly, about the enlargement and are inclined less than 30.degree. relative to the longitudinal axis of the shank.

Abstract: A device (10) for compressing a closure assembly (82) and an O-ring (80) within a control rod drive mechanism for a nuclear reactor in order to seal same. The device (10) applies a predetermined compressive force to the closure assembly (82) and O-ring (80) and has incorporated therein an angularly movable sleeve (18) which engages a lock nut (98) and threadably advances same within the control rod drive mechanism so as to engage the closure assembly (82) and apply the predetermined compressive force to assembly (82) and O-ring (80). After depressurization, lock nut (98) retains closure assembly (82) and O-ring (80) within the control rod drive mechanism by a predetermined residual compressive force.

Abstract: Each jaw of a pair of jaws of an expandable jaw power tool are individually modified so as to accept a shaft supported in one jaw while passing through the other jaw of the same pair. The shaft includes an adjustable power distributing member which makes the depth of the jaws adjustable and makes greater use of the power stroke of the jaws, distributes the power or pressure output of the jaws over a wider area and makes an improved power tool, adjustable at the point of application of power stroke.

Abstract: A fluid gear or like pulling device comprising a body having a through axial bore adapted to admit a shaft; opposed piston chambers extending radially of the bore; pistons in the piston chambers and having a free end adapted to enter into the through bore; apparatus for pressurizing the piston chambers with fluid to force the piston outwardly of their chamber and into the through bore; a press ram mounted in the body for movement axially thereof; and apparatus for moving the press ram axially of the body, the body is sleeve shaped and the piston chamber extend through the sleeve shaped body from outside to inside, the outer end of the piston chambers being formed by the inner side of a ring that extends around the outside of the body.

Abstract: A portable hydraulically operated rescue tool has a pair of force arms supported for pivotal movement adjacent inner ends and an hydraulic piston-cylinder assembly for pivoting the arms to move the outer end portions of the arms generally toward and away from each other between adjacent and spread apart positions. Spreader plate assemblies are releasably connected to the outer ends of the force arms. Each plate assembly includes a spreader plate connected to an associated force arm to pivot about an axis which extends transversely of the longitudinal axis of the arm and which is spaced longitudinally inwardly from the outer end of the arm. Each plate may be further supported to swivel about a central axis normal to its pivotal axis. One of the plates may have an arcuately concave contour for gripping engagement with a cylindrical member, such as the steering column of a motor vehicle.

Abstract: A cable racking system for bending and holding in place large wires or cables which includes a jack having a double-acting hydraulic cylinder and three-way control valve means mounted on the cylinder to supply hydraulic fluid in one mode to extend or retract a piston rod mounted cable seat with precise control and in a another mode to hold pressure on the hydraulic cylinder so as to maintain any desired condition of piston rod extension.

Abstract: Anti-binding structure for jacks is provided which eliminates load-induced binding between an extended jack lift post and the guide structure therefor, so as to facilitate smooth jack operation. The jack of the invention preferably includes a rectangular or sqaure cross section lift post and a plurality of elongated, transversely U-shaped bearing channels respectively disposed between the planar post faces and the upper guide plate of the jack; the channels are each mounted for limited rocking movement about respective axes transverse to the longitudinal axis of the jack post so that any load-induced canting or deflection of the post can be safely accommodated without binding or galling thereof.

Abstract: A jack comprising a cylinder and a piston, the piston being reciprocal in the cylinder by means of pressure fluid. A piston rod extends out through an end wall of the cylinder. An abutment is fixed to the cylinder or connected to the piston rod. A restricting member, connected to the piston rod or the cylinder, is axially displaceable thereon for engagement with the abutment in any relative position between the piston and the cylinder. A locking device can be connected to the cylinder or the restricting member to lock the latter when engaging the abutment.

Abstract: A vertical lift unit comprises a horizontally disposed upper plate adapted for suspension from a reciprocal shuttle feed unit, and a horizontally disposed lower plate adapted for supporting a reciprocal work piece gripping, lifting and transport assembly. A cylinder assembly is interposed between and interconnects the plates for effecting relative vertical movement therebetween. A series of bi-fold linkages are mounted quarter laterally in a rectangular pattern around the cylinder assembly and interposed between the plates and at their respective free ends pivotally connected to the plates for providing straight vertical lift motions to the work piece transport assembly. The bi-fold linkages are arranged in opposed spaced pairs, and a combination adjustable lock screw assembly and interconnected shock absorber assembly is interposed between one of said pairs of bi-fold linkages for selectively preadjusting the vertical work stroke of the lower plate and cushioning its downward movement.

Abstract: An arrangement for modifying a plow blade power unit of the type positioned between the mounting frame on the front of a vehicle and a plow blade lift arm, to a unit for creating pressurized fluid from a remote location. Modification enables a basically similar power unit to be utilized in both remote and direct operational environments with only minor substitution of interchangable parts. A piston-cylinder unit which enables direct lifting of a plow blade is replaced by a modified, but similar, cylindrical element for use in indirect lifting of a plow blade by fluid under pressure.

Abstract: A lift cylinder including a tubular outer cylinder having an inner cylindrical surface cooperable with an extendible piston and piston rod assembly to define an annular space therebetween, and an annular guide bushing supported within the annular space in a manner to eliminate eccentricity stack-up. "Tolerance stack-up" is defined as the compounding of eccentricity by mounting one eccentric part upon another.

Abstract: An hydraulic floor jack of the type which rolls on the floor to engage under a vehicle to lift it. This jack is characterized by an articulated frame to operatively and selectively use less floor space, flexible tire wheels to allow the load on the jack to be transmitted directly to the floor by the base of the jack upon flexing of the flexible tires under the load until the best rests on the floor, and by a narrow construction and arrangement of the operative parts to allow engagement in narrow spaces and in particular between the tandem wheels of a truck.

Abstract: The device comprises a detachable sling consisting of an upper part and a lower part. The upper part carries a self-propelled trolley. The lower part of the sling is articulated by links with supporting shoes also articulated to each other by links. The shoes are arranged symmetrically with relation to the longitudinal axis of the pipeline and are moved by hydraulic cylinders, both ends of each cylinder connecting the lower part of the sling with one of the shoes by means of ball joints. Both parts of the sling are interconnected with each other by projections and slots installed, respectively, on the upper and lower parts of the sling.

Abstract: A method and fixture for lateral and longitudinal positioning of mobile home or modular housing units on the foundation site is disclosed, particularly related to positioning more than one module sometimes referred to as double wide or other structural units, such as modular subunits with respect to each other incidental to assembly operations. The method includes the procedure of initially installing one of the double wide or other structural unit on a foundation including a plurality of stanchions, positioning a second structural unit adjacent the position of the first structural unit with a clearance space therebetween for carrying out steps preparatory to joining of the units, the second unit being positioned on a series of temporary cross beams supported on the foundation stanchions and engaging the structural units underframe members.

Abstract: This invention provides a device enabling movement of an electrical conductor through, or from one side to the other of, a string of insulators coupled between a supporting tower and a yoke plate, and has an upper frame with clamping jaws engageable with one of the insulators, a lower frame connectable to the yoke plate, and manually operable mechanism interconnecting the two frames for selectively moving them relative to each other in the direction of the axis of the insulator string to permit uncoupling of a portion of the string, movement therethrough of the conductor, and recoupling of the string.

Abstract: The jack includes conventionally a rod mounted in the cylinder and moved in translation with respect to the latter by any known means. This jack is characterized in that the rod is fast in rotation with a bearing in which it is slideably mounted if necessary in fluid-tight manner, said bearing being mounted in the cylinder head end or in an element fast to the latter. A rotation actuating device is provided to directly or indirectly rotate the bearing so that the rod can be driven at will with a translation movement or a rotation movement or with a combination of these two movements. The invention is particularly useful in automation.

Abstract: A cylindrical pressure vessel is placed under an inward prestress to resist outward forces by the application of outwardly spread annular stressing means which are then permitted to bear inwardly upon the vessel. The device includes fluid-pressure means for relieving the inward force during the application of the annular means so that at least one ring of the latter can expand outwardly and then contracted on the periphery of the vessel.

Abstract: A jack for positioning and supporting a large industrial machine or other object on its foundation. The jack comprises a base to be supported on the foundation, a support member having a cylinder bore therein, and a ball mounted on the base, the lower end of the piston bearing on the ball to permit limited swivel movement. The support member has a generally flat, upwardly facing end face to engage the object from below and a lower downwardly facing end face which is supported by hardened grout and which extends out beyond the base. The support member is tapered from its lower to its upper end face providing a tapered surface which is sufficiently rough to mechanically interlock with the hardened grout thereby to inhibit upward movement of the support member with respect to the foundation.

Abstract: An improvement in patient lifting devices comprising an upright member, a boom pivotably mounted on the upright member, a fluid cylinder pivotably mounted between the upright member and the boom, and a manually operated pump for the fluid cylinder. The improvement comprises means actuated by the pump handle for transferring fluid from the fluid cylinder to a fluid reservoir, thereby permitting the boom to lower under the combined weight of the boom itself and anyone being carried by the boom.

Abstract: An hydraulic pump comprising a plunger slidingly located within a housing. A first valve is adapted to allow fluid to be drawn from a reservoir into the housing during movement of the plunger in one direction, and a second valve is adapted to allow fluid to flow from the housing during the greater part of movement of the plunger in its other direction. A control apparatus is provided to control the second valve at or near the completion of the plunger's movement in the mentioned other direction to allow fluid to move back through the second valve and into the reservoir.

Abstract: A self-propelled dolly for moving (towing or pushing) a tricycle landing gear-type airplane which includes a nose wheel journaled on a depending strut; the dolly embodying--on a manually controlled, wheel-supported, reversibly power driven mobile frame--a vertically power adjustable ramp at the forward end of the mobile frame adapted to receive and elevate said nose wheel preparatory to moving the airplane from one location to another, and a forwardly projecting, power-actuated, universally mounted hook unit on the mobile frame adapted to engage and pull on the strut whereby to draw the nose wheel onto the ramp when lowered, and--while remaining in strut-engagement--holding the strut against accidental escape of the nose wheel from the ramp when raised for moving the airplane by the dolly.

Abstract: A vehicle carries a hydraulic reservoir, a pump, a portable fluid-distributing valve, four or more hydraulic rams and conduits connecting the reservoir, pump, valve and rams in a hydraulic circuit such that the valve and rams may be removed from the vehicle. The rams are then connected to a BOP and beams under the rig floor; the valve is held by an operator a safe distance from the BOP and manipulated to uniformly and safely lift the BOP.

Abstract: A cylinder housing has a passageway extending in from the exterior thereof for admitting and discharging fluid to a cylinder portion. A piston in the cylinder has return movement by means of a resilient retracter, and a check valve having protected support in the housing is arranged to close off fluid discharge from the cylinder under abnormal fluid pressure return conditions such as when the ram is in use and there is a failure in the fluid supply for the piston.

Abstract: A groove is provided in either one or the other of a cylinder housing or the piston and a pressure sealing ring is mounted in this groove. A resilient ring is in surface engagement with the sealing ring and a semi-resilient ring, also in the groove, is disposed in engagement with the outer edge of the resilient ring whereby upon the application of surface pressure by the sealing ring against the resilient ring as a result of fluid pressure in the cylinder, the resilient ring is compressed. This expands it to a larger diameter which in turn expands the semi-resilient ring to a larger diameter for efficient sealing. A lip on the member with the groove therein projects outwardly for backing up the semi-resilient ring.

Abstract: There is disclosed an apparatus suitable for shifting the plates of a plate filter press. The apparatus comprises supporting means for supporting the apparatus so that it can be moved longitudinally of the plate filter press, and a manually-operable, power-drivable device including first and second members capable of engaging plates of the plate filter press and movable relative to one another by a source of power along a line of action which, when the apparatus is in use is parallel to, or substantially parallel to, the plate filter press. The arrangement is such that, in use, the device can be rotated or swung in order to bring the first and second members into and out of engagement with plates of the plate filter press and, when in engagement with plates of the plate filter press, the device can be operated to cause movement of the first and second members relative to one another and hence movement of one or more plates of the plate filter press.

Abstract: Apparatus for moving railroad cars, barges or the like along tracks includes three double-acting hydraulic cylinder mechanisms operatively supported from trackside overhead framework structure. A first, push-pull hydraulic mechanism is extensible and retractable within a plane parallel to the railroad tracks and the same is disposed toward one side of the tracks. A second, clamping hydraulic mechanism is supported upon the free end of the push-pull mechanism. As a result of the disposition of the first mechanism toward one side of the tracks, the clamping mechanism is able to positively clamp the upper side wall portion and said rail portion of the railroad car. Movement of the car in either a forward or backward mode is attained under the influence of the first mechanism. Alternatively, the push-pull mechanism can retard movement of the car and safely retains the car in a predetermined position when the mechanism is not actuated.

Abstract: A pneumatic jack comprising a cylinder having a removable cover, an inlet for pressurized gas near the bottom of the cylinder, a piston having a resilient piston cup within the cylinder and positioned for vertical movement therein, the cover including a centrally positioned piston rod bushing and at least two laterally offset stabilizer rod bushings, the bushings extending above and below the cover, a piston rod secured to the piston and extending through the piston rod bushing, and at least two stabilizer rods also secured to the piston and extending through the stabilizer rod bushings, and helical springs surrounding each of the stabilizer rods and engaging the piston and the cover for urging the piston downwardly within the cylinder.

Abstract: Lift apparatus by which wheelchair invalids are lifted from one location, through a spiral, to another location. The lift apparatus includes coacting movable and fixed support members which are telescopingly received within one another to form a variable chamber therebetween.A cantilever arm is affixed to and radially extends from the movable support member. A pair of spaced arms are affixed to the cantilever arm and removably engage a chair. The cantilever arm is adjustably affixed to the movable support member such that the arm can be adjustably positioned along any radial extending from the axial centerline of the support members.A cam means is jointly associated with the two support members in such a manner that when fluid pressure telescopes the two support members apart, the cantilever arm is rotated 45.degree. towards the end of the upstroke and thereafter, the cantilever arm is rotated another 45.degree. as the chair is lowered back into proximity of the original elevation.

Abstract: A double-acting jack having a working chamber is fitted with an adjustable stop against which its piston comes to rest. The stop is constituted by a nonrotatable nut, which is axially displaceable by an axially nondisplaceable lead screw with which it meshes. The stop includes means for controlling the supply of pressurized fluid from a supply line to the working chamber, the supply line being opened whenever the piston and its associated rod are not in the end-of-stroke position and closed whenever the piston and its rod are in the end-of-stroke position. The lead screw is mounted to have a slight amount of axial play. The supply line terminates in an annular opening provided on a shoulder of the lead screw, which defines a valve, or in it seat.

Abstract: An electrohydraulic drawing or hoisting apparatus for the pulling or lifting and lowering of loads, in which a load lifting member, hydraulic fluid tank, electric motor, pump, and control unit are all mounted within a single compact unit which is rigidly connected to one end of a cylinder piston unit. A control handle is connected to the hydraulic control unit so that the directions of displacement of the handle and the resulting motion of the load lifting member coincide substantially. The speed of the piston in both directions is continuously variable as a function of the displacement of the control handle. The piston's speed in at least one direction of motion, moreover, is controlled by influencing the pump delivery through displacement of the control handle.

Abstract: Cushioning apparatus for cushioning a hydraulic jack is disclosed which includes a plunger reciprocably mounted within a blind bore. The plunger sequentially closes off a plurality of axially spaced orifices provided through the wall of the bore as the plunger moves from a first position adjacent the open end of the bore to a second position adjacent its closed end, thereby progressively restricting the escape of fluid from the bore so as to slow the movement of one of the telescopic members of the jack toward another.

Abstract: A double-acting hydraulic cylinder having two concentrically disposed jackets and at least two pistons arranged for coaxial movements relative to said cylinder, one of said pistons being annular and arranged for axial movement in an annular chamber, means being provided to communicate a space between the inner piston and an end section of the inner jacket, with the opposite end of the annular chamber in a manner ensuring that the operative, pressurized medium actuates the two pistons for displacement thereof in a predetermined order and at approximately the same speed in the outwards and inwards directions of said pistons.

Abstract: The invention operates on a bundle of cooling tubes which in use are disposed within a heat exchanger shell which is typically a longitudinally elongated cylinder disposed with its long axis horizontal and supported well above a floor, on a steel framework. The array of tubes become corroded and clogged after a period of use, either internally, externally, or both, and must be pulled linearly out of the shell for replacement. Typically the initial pulling is a difficult job because the tubes have become tightly corroded to the shell.Herein is disclosed an improvement to the type of tube bundle extractor in which the operative unit is a car movable along a pair of rails supported in alignment with the heat exchanger, the rails being supported on a framework which is usually suspended from a crane hook, the framework being secured to one end of the heat exchanger during a bundle pulling or bundle inserting step.

Abstract: An apparatus for use in replacing the bolster-supporting springs between a truck and a bolster of a railway car is disclosed. The apparatus has first engagement means to engage an upper part of the truck, second engagement means to engage the bolster and hydraulically actuated means connected at one end to the first engagement means and at the other end to the second engagement means to urge same together when actuated, whereby the bolster is raised to permit removal and replacement of the springs. Preferably, the first engagement means comprises a pair of hanger bars having hooks at their upper ends to engage the top of the truck and the second engagement means comprises a member slidably mounted on said hanger bars and having a portion insertable into the end of the bolster. The hydraulically actuated means preferably comprises a pair of piston and cylinder arrangements mounted one on each of the hanger bars at its lower end and engaging the slidably mounted member at its upper end.

Abstract: A jack comprising a cylinder and piston defining an expansible chamber having opposed cylinder and piston faces and being adapted to receive a pressurized, hardenable liquid, such as an epoxy resin mixed with a suitable hardener or catalyst, for relative extension of the cylinder and piston. The piston face protrudes outwardly beyond the body of the piston with the outermost protruding portion of the piston face being at the center thereof. The cylinder face has a pocket therein in line with the outermost portion of the piston face, the latter being surrounded by a space for the liquid when the cylinder and piston faces are relatively retracted, this space constituting a portion of the chamber.