Abstract: A device is disclosed adapted to be permanently embedded in the masonry floor of a building structure for both supporting and joining pipe sections extending above and below the floor. The device has anchor means formed integrally therewith which are surrounded by the masonry material to prevent movement of same relative to the floor. The ends of the device are of several different designs to permit the joining thereto of pipe ends by various methods also described.

Abstract: A structural member having an enlongated body shell, which may be fiberglass, and a pair of end caps enclosing the ends of the shell. A plurality of bands extend through the shell connecting the caps and pulling them toward each other, thus rigidifying the member and securing the caps. Contact between the interior surfaces of the shell and the side edges of the bands causes the shell to resist collapse. At one end of the member, the bands are secured to the end cap by movable anchor piece. A tensioning member threadedly engages the anchor piece so that tension can be applied to the bands by rotating the tensioning member. At a predetermined tension, a drive piece connected to the tensioning member breaks away and serrations on the head of the tensioning member prevent it from counter-rotating to release the tension.

Abstract: A machine for packaging sundry articles between two weldable plastics material sheets is disclosed, in which provision is made for the formation of a top sheet loop to cope with different tallnesses of the articles as they are being packaged and sealed between the plastics sheet: undue sheet tensions are prevented as well as undue slackening of the sheet.Waste of plastics material is also efficiently done away with.

Abstract: A tennis ball, racquet ball or other gas-filled ball is inflated with air or gas to such a degree that the ball will precisely balance a given applied force on the ball producing a given deflection of the ball. No attempt is made to achieve uniform internal pressure in inflated balls. The method instead attains a uniform and precise stress-strain relationship. The method of manufacturing produces substantially superior balls in terms of uniformity of play characteristics including bounce.

Abstract: A method and apparatus for packing a box or other product is disclosed which involves wrapping a packing sheet about the product in an improved fashion. The method includes lapping the packing sheet around the product, folding opposed side edges of end portions of the packing sheet over ends of the product and folding upper and lower edges of the folded end portions of the sheet over the product ends. The upper edges of the sheet are folded upwardly at the same time that side edges are folded over at least one end of the product. Upper and lower edges of the end portions are then folded over the product ends and attached to each other. The apparatus for performing the method includes a packing sheet lapping section, a product transfer path located adjacent to a leading side of the lapping section, a pusher positioned adjacent to a trailing side of the lapping section and a plurality of folding elements.

Abstract: A system and method for refurbishing and processing parachutes is disclosed including an overhead monorail conveyor system on which the parachute is suspended for horizontal conveyance. The parachute is first suspended in partially open tented configuration wherein open inspection of the canopy is permitted to remove debris and inspect all areas. Following inspection, the parachute is transported by the monorail conveyor to a washing and drying station with the parachute canopy mounted on the conveyor in a systematic arrangement which permits water and air to pass through the ribbon-like material of the canopy. Following drying of the parachute, the parachute is conveyed into an interior space where it is finally inspected and removed from the monorail conveyor and laid upon a table for folding. Following folding operations, the parachute is once again mounted on the conveyor in an elongated horizontal configuration and conveyed to a packing area for stowing the parachute in a depolyment bag.

Abstract: Apparatus for enumerative display and disposal of surgical sponges comprising a circular one piece molded plastic article adapted to be fit over the rim of a standard surgical kick bucket and a bag placed in the kick bucket. The article bears a predetermined number of notches in its upper portion for display of sponges draped over the notches, so that when each notch bears a sponge, the number of used sponges on the article is known. The article contains a number of other features including a circumferential fluid receiving portion, shoulder portions, and a tapered annular channel portion to receive a bucket handle, and tapered projections in the notch portions to improve retaining engagement of the sponges. The article is designed to be nestable for easy packaging, sterilizable, inexpensive, and disposable.

Abstract: A clutch-brake device for cutting machines disclosed herein has a first cover secured to the bottom of the engine case and a second cover rotatably fitted over an output shaft which is connected to an engine and projects from the first cover. A cutting blade is secured to the bottom of the second cover. A brake plate and a clutch plate are provided immediately above and below a disk mounted on the output shaft for rotation therewith, and are connected together at their peripheries. The clutch plate is urged by a spring toward the disk. One of the clutch plate and the brake plate has a plurality of guide pieces projecting from the outer periphery thereof and slidably fitted into a plurality of axial recesses formed in the second cover. A brake lever is provided on the first cover immediately above the brake plate for rotation and axial sliding movement.

Abstract: Most presently known crop harvesting attachment flotation apparatus use a spring to preload the attachment into a floating mode. A problem with this is that, as the attachment is either forced upwardly or intentionally raised, the effectiveness of the spring decreases. This is avoided by a combination of a spring and a fluid operated cylinder acting through pivotal linkage relationships for retaining the attachment in a substantially constant flotation mode during lifting operations and during flotation operations.

Abstract: The riding lawn mower includes a prime mover supported on wheels for movement over the ground, a blade housing carrying one or more cutter blades and having leading and trailing end portions, one or more ground engaging wheels partially supporting the blade housing for gaging the distance the leading end portion of the blade housing travels above the ground, and a suspension system mounting the trailing end portion of the blade housing on the front end of the prime mover and arranged to transfer a portion of the weight of the blade housing to the prime mover so that the prime mover front wheels gage the distance and trailing end portion of the blade housing travels above the ground.

Abstract: Cotton bolls, along the fingers of a cotton stripper, are brushed upward to the conveyor by brushes mounted upon chains which run on sprockets on either side of the fingers. The speed of the brushes along the finger is slower than the speed of the stripper along the ground and also slower than 300 feet per minute to prevent throwing the light fluffy cotton from the stripper.

Abstract: A rotary mower has a cutting plate to which freely pivotal blades are attached by retaining pins. Instead of riveting the pins directly to a leaf spring which holds the pins in place, a keyhole slot is provided in each leaf spring and a narrow waist of the retaining pin fits into rectilinear portion of the keyhole slot and is held in position there by a holding plate riveted to the leaf spring. This allows case hardening of the entire retaining pin and prevents nonuniform stresses in the latter from causing breakage.

Abstract: A wire taping installation provided with a device supplying the wire, a device for receiving the taped wire, a taping device fed with tape, as well as two pulleys round which the wire to be taped passes, the tape being applied against said wire between the two pulleys round which said wire passes and each pulley being connected to an apparatus for measuring the force, an installation in which there are electrical pick-ups respectively associated with said pulleys (2, 3), said pick-ups supplying T'am, T'av signals proportional to the Tam and Tav tensions of the wire round said pulleys (2, 3) and a substractor receiving said T'am, T'av signals so as to form a difference signal, said difference signal being compared in a substractor S2 with a theoretical value quantity (TrO cos .alpha.) and said difference signal is applied to an amplifier supplying a control signal SC of a device regulating the tension of the tape.

Abstract: A method and apparatus for changing bobbins in a flyer spinning frame which includes a bobbin rail for supporting bobbins adjacent the flyers movable both vertically and tiltably, the bobbin rail being moved sequentially from an upper bobbin winding position, a lower horizontal position, a forwardly tipped position, then upwardly in the tilted position into a comfortable bobbin doffing position, downwardly into the lower position, back into a horizontal position while in the lower position then finally upwardly into the upper bobbin winding position.

Abstract: The quantity of NOx emissions generated by a combined gas turbine-steam boiler power plant is controlled by recycling a controlled amount of the steam boiler exhaust gas to the air compressor of the gas turbine such that the recycled gases constitutes up to about 30% of the fluid flowing through the air compressor and by cooling the recycled steam boiler exhaust gases to about the desired gas turbine compressor inlet temperature prior to its introduction into the air compressor.

Abstract: A rotating fluidized bed heat exchanger particularly adaptable as a heat exchange unit in the recuperator section of conventional gas turbine engines comprising an annular fluidized bed, defined by inner and outer spaced apart coaxial cylindrical, perforated walls, which rotates about the longitudinal axis of the cylinders. The bed is comprised of pulverulent inert particulate material and includes fluid-containing heat exchange tubes passing substantially longitudinally therethrough. Hot gases, such as turbine exhaust gases, enter the bed through the outer perforated wall, heat and fluidize the bed particles, heat the fluid, usually compressed air, in the tubes, and exit the bed through the inner perforated wall. The heat exchange tubes direct the fluid flowing therein from an inlet adjacent the inner perforated wall to an outlet adjacent the outer perforated wall such that the fluid flows substantially countercurrently to the hot fluidizing gas.

Abstract: An hydraulic booster in which a control chamber is defined between an input piston and a second piston relative to which the input piston is movable, and recuperation valve for controlling communication between the control chamber and a reservoir is located in the control chamber. The recuperation valve closes upon relative movement of the input piston towards the second piston, further movement of the input piston in the same direction causing pressurization of fluid trapped in the control chamber.

Abstract: A brake force servo-device, especially for motor vehicles, with a control piston, selectively actuatable preferably by a brake pedal, which cooperates with a connecting valve connected with a pressure medium source and which is operable to displace a flow medium out of its cylinder space for the actuation of the connecting valve; a working piston is thereby actuated by the pressure controlled by the connecting valve, whereby the control piston is constructed as one-piece control piston having an annular step and is sealed off, on the one hand, within the area of its entry into the brake force servo-housing and, on the other, in proximity of its end face which projects into a working pressure space; the control piston thereby abuts at the working piston present in the working pressure space while the connecting valve is actuated by the flow medium displaced by the annular-shaped step of the control piston out of the annular space which is formed between its two bearing places.

Abstract: The apparatus for collecting radiant energy and converting same to alternate energy form includes a housing having an interior space and a radiation transparent window allowing, for example, solar radiation to be received in the interior space of the housing. Means are provided for passing a stream of fluid past said window and for injecting radiation absorbent particles in said fluid stream. The particles absorb the radiation and because of their very large surface area, quickly release the heat to the surrounding fluid stream. The fluid stream particle mixture is heated until the particles vaporize. The fluid stream is then allowed to expand in, for example, a gas turbine to produce mechanical energy. In an aspect of the present invention properly sized particles need not be vaporized prior to the entrance of the fluid stream into the turbine, as the particles will not damage the turbine blades.

Abstract: A heat pumping process for the generation of industrially useful heat energy achieves an improved fuel effectiveness by feeding back to the process part of its otherwise output heat energy as an input to assist in compressing the process evaporized performing fluid. An equivalent amount of extraneous fuel otherwise required to carry out the mechanical work now done by the fed back energy is thus replaced.

Abstract: Apparatus for removing liquified gas which boils at ambient temperature from an enclosed reservoir. Removal from the reservoir is controlled by an on-off valve disposed in a delivery line, while selectively venting the pressurized vapor of the liquid generated above the reservoir. When flow is desired, the valve is opened and the vent is blocked by a warm heat rod slidable into and out of heat exchange relation with the liquid in the reservoir, which causes the liquid to boil and consequently, increases the vapor pressure on the liquid to cause it to flow through the delivery tube.

Abstract: A vapor compression heating/cooling system and method of operation having improved Coefficient of Performance and Capacity. Post-condenser liquid is cooled in a subcooler coil by a stream of air. One embodiment provides a warming machine or heat pump in which the condenser coil is within a volume to be warmed and the evaporator coil is on the outside exposed to ambient air. A stream of ambient air is pumped in heat exchange relationship with the subcooler coil to recover and expel heat from the coil into the volume. Where the volume comprises the interior of a house or other building structure the stream of air from the subcooler creates an over pressure within the volume to minimize infiltration of ambient air. In another embodiment the system is employed for refrigerating a volume such as a reefer trailer or other mobile compartment. The evaporator coil is within the compartment and the condenser coil is outside the compartment exposed to ambient air.

Abstract: Electronic control apparatus is disclosed for automatically controlling the operation of refrigeration units on truck-drawn trailers which includes an undercool comparator (240) connected to a resistor (239) in a voltage divider including a temperature selector (13) and having its output in parallel with an overcool comparator (44), either of which will actuate a malfunction indicator (15) in the event of undercooling or overheating conditions during a chilled food setting for the temperature selector (13). An overcool comparator (91) that is turned on when the selector (13) is moved to a frozen food mode operates a control element in the form of a transistor (99) that serves to disable the output of overcool comparator (240) and prevent the actuation of the heat load device (23) by effecting grounding connections in the circuit.

Abstract: A two-stage refrigerator for medicine or similar material storage in the known operation of which the high stage chills the refrigerant of the low stage so that extremely low temperatures can be obtained in the freezer compartment. In a departure from present practice, both stages, not just the low stage, have an on-off operating mode in response to the freezer compartment temperature, with the result that there is a significant reduction in the consumption of electrical power by the unit.

Abstract: A cooling system utilizing cold outdoor air and water for cooling high heat generating equipment such as a computer. The system includes a cold water coil and a cold water switching valve in addition to an ordinary air conditioning apparatus. When the outdoor temperature is sufficiently low, the water is routed through the cold water coil instead of a condensor, and the room air is cooled directly by the cold water.

Abstract: A vapor generating and recovering apparatus for vaporizing a liquid and condensing a vapor, the apparatus including a container having a liquid therein with a heating and cooling system in heat transfer relation with the liquid and vapor in the container. The heating and cooling system includes means to vaporize the liquid and means to condense the vaporized liquid disposed within the container, and, means to compress a refrigerant. The means to compress the refrigerant is in fluid communication on its high pressure side with the means to vaporize the liquid and on its low pressure side with the means to condense the vaporized liquid. The apparatus further includes a heat exchanger within the container for removing excess heat therefrom.

Abstract: A water producing-air conditioning system comprises a water producing apparatus which adsorbs moisture in the ambient air on an adsorbent or absorbent and evaporates water adsorbed on the adsorbent or absorbent by heating it and condenses steam to obtain water;a heat-exchanger which heat-exchange the ambient air with a hot dry air discharged from said water producing apparatus during adsorbing moisture on the adsorbent or absorbent; andan evaporation-cooling apparatus for forming a cold wet air by evaporating water and cooling it by contacting water with a dry air at the ambient temperature passed through said heat-exchanger.The hot air heated by said heat-exchanger or the cold air obtained from said evaporation-cooling apparatus is utilized for the air conditioning. The system can be used for comfortable living in a severe condition such as a desert by the effective combination of the evaporation-cooling apparatus with the water producing apparatus under utilizing heat-exchange in high efficiency.

Abstract: Apparatus and a method for providing a combination of non-reverse and reverse defrost for a refrigeration circuit are disclosed. A three-way valve is provided for initially circulating hot gaseous refrigerant directly from the compressor to the heat exchanger requiring defrost. An intermediate header is provided as part of the internal circuiting of the outdoor heat exchanger, said intermediate header serving to direct hot gaseous refrigerant from the three-way valve into all of the circuits of the outdoor heat exchanger simultaneously to effect defrost thereof. If, after a predetermined time period, the first mode of defrost directing hot gaseous refrigerant directly to the outdoor heat exchanger fails to accomplish defrost then the three-way valve is returned to its original position and the system is operated in a second defrost mode with the reversing valve being changed such that the system operates in the cooling mode and the outdoor heat exchanger serves as a condenser until defrost is completed.

Abstract: Heat pump/air conditioning converter apparatus for directing a refrigerant from a compressor to a first heat exchanger located within a building and a second heat exchanger located outside the building for selectively cooling and heating the first heat exchanger. The apparatus has a housing within which a reversing valve, a liquid refrigerant flow control valve system, an expansion valve and an accumulator tank is incorporated. The housing has a number of cavities for receiving the various components of the valves and tank, and a number of passageways for directing the refrigerant to the components to minimize the number of external connections. The reversing valve incorporates an axially slideable rod having a large main piston positioned centrally thereon and a pair of smaller valve opening/closing piston members at each end, one end controlling the hot high pressure gaseous refrigerant and the other end controlling the low pressure relatively cool gaseous refrigerant.

Abstract: A closed refrigeration circuit comprises in series a compressor, a condenser, a drier-filter, a capillary tube, an evaporator, and a conduit connecting the evaporator to the condenser and traversing the drier-filter. A refrigerant fluid circulates in operation through the circuit. With this arrangement the connecting conduit is in heat-exchanging relationship with the drier-filter, thereby avoiding the need for a separate heat exchanger.

Abstract: The present invention relates to a chiller of the type using water as refrigerant and aqueous lithium bromide or a similar compound as absorbant wherein non-condensables are purged with water vapor from the condenser to the evaporator, wherein means are provided for condensing part of the water vapor conveying the entrained non-condensables as this is conveyed to the evaporator. According to one embodiment, entrained non-condensables are contacted with a condenser tube so as to condense part of the water vapor.

Abstract: A borehole logging tool and cryostat therefor to maintain a semiconductor detector at cryogenic temperatures. The cryostat has an elongate single-phase heat sink of solid, thermally conductive material on which the detector is removably mounted. The other end of the heat sink is arranged to receive a liquid cryogen or the cold finger of a helium refrigerator, which is removed before a logging run; the detector being maintained at cryogenic temperatures during the logging run by absorption and retention of heat in the solid, single-phase heat sink. A rigid tube having similar thermal capacity and similarly pre-cooled to cryogenic temperatures, surrounds but is spaced from the heat sink. The tube and heat sink are supported by low thermal conductivity supports, the tube supports being arranged to permit changes in length of the tube.

Abstract: A downhole drilling system utilizes a non-rotating kelly bushing for locking in the torque created in the drill string by the downhole drilling motor. The kelly bushing prevents rotational movement of the kelly secured to the drill string on which the downhole motor is attached. The kelly bushing includes a torque mechanism for enabling the kelly and the attached drill string to move in a forward direction into the hole being drilled while prohibiting any rotational movement. The torque mechanism includes a pair of rollers which are adapted to non-rotatably receive and vertically guide the kelly therebetween. The spacing between the rollers is adjustable to accommodate different sized kellys. A guide mechanism is provided in the kelly bushing for enabling an electrical wire to be attached to either the downhole motor or a sensing mechanism located in the area of the downhole motor for feeding back to the surface appropriate electrical signals indicative of certain drilling operations.

Abstract: A plunger type lock construction in which the key receiving face thereof is spaced a critical distance from a portion of a reciprocable plunger which is within the lock body and which is engaged by the key to release locking members extending from the lock body. The lock body has shaped means at its key receiving face which prevents insertion of a key to the proper, lock operating depth in the lock if the end of the key which faces the key receiving face is not shaped so as to receive the shaped means on the lock body. Each lock may have a differently shaped means so that a key which will fit one lock will not fit another lock, but a master key may be provided which will fit all or only a plurality, of such locks.

Abstract: An improved and simplified dead bolt rim lock, which provides "classroom function". A dead bolt is fixed on a draw plate slidable in a rim lock case and having a cross slot which extends one way from center and is engaged by a crank pin movable in an 180.degree. arc between front and rear centered positions. The crank pin is on a crank arm carried by a turnknob rotatable in the rim lock case, and its projecting end lies in the path of a cam mounted for rotation in the back plate of the case and connected for operation from a key-actuated cylinder mounted in the outside face of the door. For classroom function, the turnknob has a limited throw and has lost motion relative to the crank arm so as to allow retraction of the bolt by the turnknob but prevent its advancement thereby to locked position.

Abstract: A locking means for locking the fuel tank cap on a vehicle such as a large truck such that the fuel cap cannot be removed and the means bolting the locking means to the tank cannot be removed without unlocking the locking means.

Abstract: A straightening machine has upper and lower sets of straightening rollers, each backed up by back-up rollers. The back-up rollers are mounted on bearing supports. In one set of straightening rollers, the bearing supports extend parallel to the rollers and all the back-up rollers associated with one straightening roller are mounted on a common support. In the other set of straightening rollers, the bearing supports extend at right angles to the rollers, and each support mounts back-up rollers, each of which is associated with a different one of the straightening rollers. Each of the bearing supports can be moved towards or away from the gap between the upper and lower sets of straightening rollers.

Abstract: A method for manufacturing a poly-V pulley comprising pre-forming the flange wall of a cup-shaped blank to have a corrugated cross section having a series of valleys formed around the outer circumference thereof, axially compressing the corrugated flange wall of the blank, and pressing a rotary forming roller against valleys formed around the outer circumference of the flange wall to form each of valleys to a predetermined V-groove. The axially compressing process is carried out keeping respective outer circumference of axially movable auxiliary forming rollers inserted into their corresponding valleys formed around the outer circumference of the flange wall of the blank.

Abstract: A rotary pipe bending machine employs two sets of bending dies for making either right-hand or left-hand bends about a horizontal axis. A pipe handling carriage having a laterally offset chuck is slidably mounted along a track to longitudinally and rotationally position pipe with respect to the machine bending head. The track is pivotally mounted for 180.degree. of rotation about an axis extending longitudinally through the track so that the chuck can be positioned on one side or the other of the longitudinal machine center line. This enables the chuck to position a pipe to be bent by the die set on either side of the machine.

Abstract: A push bench is provided for the production of tube blooms in which the last roll stands of a plurality of roll stands one behind the other in the direction of pushing have radially adjustably supported rolls, said radially adjustably supported rolls being radially adjustable at the beginning of each working cycle with regard to the diameter or diameter tolerance of the mandrel rod being used for that work cycle.

Abstract: A continuous rolling line and method for rolling wires or bars is provided using at least one repeater rolling unit of at least two roll stands having a rolled stock loop between them and a multi-stand continuous rolling unit spaced from and receiving rolled stock from the repeater rolling unit.

Abstract: An extrusion die for forming a multi-passage, elongated tubular member having transverse passageways formed between adjacent longitudinally extending passageways during the extrusion of the tubular member.

Abstract: A hollow, tubular blank is provided with annular, radially inwardly and/or outwardly extending protrusions by means of rolling or upsetting. These protrusions are provided with gearing teeth by means of an annular drawing die and a plug, one of these or both being provided with a gearing-forming profile.

Abstract: An axial discharge apparatus for use with a drawbench or an extrusion press includes a plurality of shiftable forks aligned for reception of drawn or extruded stock and a plurality of powered rollers disposed therebelow. The forks receive one or more lengths of drawn or extruded stock subsequent to the completion of forming and, in unison, lower them to the rollers. Rotation of the rollers conveys the formed stock axially out one end of the drawbench.

Abstract: A pipe bending apparatus for bending thin wall pipe used in oil and gas pipelines. The apparatus includes a housing section with an upper bending die connected to its frame. Mounted within the housing section are a pair of flexible external bending shoe assemblies for clamping around the external surface of that section of pipe to be bent. The apparatus further includes a flexible mandrel aligned between the external bending shoe assemblies and adapted for being inserted into the pipe and expanded during bending operations. A positioning assembly is also connected between the mandrel and the housing section for accurately positioning the mandrel in the pipe and moving the pipe with respect to the apparatus while insuring that the bend is properly aligned. The mandrel further includes a series of slidably mounted shoe assemblies which move in a toggle-like manner to engage the inner surface of the pipe.

Abstract: An improved releasable coupling device for a tube is disclosed. The coupling device comprises a fitting having a bore therein and an opening into the bore through which the tube is to be inserted, a retaining ring disposed in the opening and having a plurality of axially extending inwardly biased fingers, and an unlocking collar positioned inside of the retaining ring in the opening. The inwardly biased fingers of the retaining ring each have a gripping portion adapted to engage the tube when the tube is inserted into the fitting towards the bore so that the tube is restrained against axial movement out of the fitting. The unlocking collar is axially movable relative to the retaining ring for direct engagement with the fingers upon axial movement towards the fingers to force the fingers radially outward to cause disengagement of the gripping portions from the tube.

Abstract: A rotary forging or upsetting machine comprising an upper platen and a lower platen, the lower platen being rotatable about a first axis and the upper platen being rotatable about a second axis which intersects the first axis, the upper platen being mounted on carrier which is pivotable about an axis which passes through the point of intersection of the first and second axes, means being provided for adjusting the angle of the upper platen while the platens are rotating, and means being provided for applying a force to the lower platen to move it towards the upper platen so that a workpiece carried by the lower platen is deformed by the upper platen moving around the workpiece.

Abstract: Pliers for positioning clips which form connecting rings between a wire netting and support wires. The pliers comprise two arms pivotally connected together, with the front ends of these two arms causing displacement of two small rods articulated on a same pin which is rigid with a mobile part guided between two plates which form a body for the pliers and carry at a rear portion the pivot axis of the arms. The plates are spaced apart at the front end by a fixed part of substantially the same thickness as that of the mobile part, and each plate comprises an upper portion with an opening which, in cooperation with a clip supply magazine mounted perpendicularly to the plates, enables introduction of a clip behind the mobile part and deformation of the clip between the mobile part and the fixed part so as to surround the support wire and a wire forming the netting. Displacement of the pin which drives the mobile part is limited by openings provided in the plates which form the pliers body.

Abstract: The herein disclosed mechanism comprises a compressed gas receiver, a shaft with a striker movable therein, and control and working cylinders arranged in series one after the other, whose pistons are interconnected by means of a rod. According to the present invention, said working cylinder is mounted in the receiver and defines a circular space between the end of the receiver and the end of the shaft. In so doing, said circular space communicates with the receiver space while the piston of said working cylinder is mounted for movement relative to the rod to permit pressure from the receiver to pass and drive the striker for a working stroke.

Abstract: A work rack structure for correcting and aligning misshapen vehicle frame and body portions comprises a rack structure having a vehicle supportive upper surface and a lower surface and with generally continuous front and rear end and opposite side rack portions having inner and outer marginal flanges and joined together to form a central interior opening whereby a vehicle straddles the opening for work access to the underside thereof. Front and rear supportive foot members are affixed to the rack structure for elevation above a floor surface, the rear supportive foot members being swingably mounted to the rack structure and having power fluid rams operatively connected thereto for folding the foot members and kneeling the rack structure to facilitate positioning of a vehicle thereon. A plurality of force applying members are affixed to the rack structure and are easily movable therearound so that they can be selectively positioned to exert force on substantially any part of the vehicle.