Abstract: The present disclosure belongs to the field of suction-operated devices, in particular to a sucker device. The device includes a sucker, a rotating member and a connecting member, wherein both ends of the rotating member are rotatably and movably connected to the connecting member and the sucker respectively, the sucker is provided with a fixing position for fixing the device on an external structure by suction, and the connecting member is provided with a connecting position for mounting a structure to be carried. In the present disclosure, both ends of the rotating member are rotatably and movably connected to the connecting member and the sucker, so that when the device is used, the suction-operated device has a larger angle adjustment range, and can better meet the use requirements of consumers.

Abstract: A linear to rotary motion converter includes a rigid body having first and second opposing end plates interconnected by at least one rigid crossmember. Each of the end plates is adapted to receive a rolling diaphragm linear actuator to thereby cause linear displacement of the rigid body in an axial direction upon actuation of the rolling diaphragm linear actuators. The linear to rotary motion converter also includes a capstan operably coupled to and located between the end plates such that linear motion of the rigid body caused by actuation of the rolling diaphragm linear actuators is translated to rotational motion of the capstan.

Abstract: A suction cup is provided, including: a cup body, including a sucking face, the cup body defining an axial direction perpendicular to the sucking face; a pump, connected to an end of the cup body opposite to the sucking face, the pump including a first passageway, a direction in which the first passageway extends and the axial direction forming an included angle therebetween; a movable handle, slidably disposed within the first passageway, including a piston.

Abstract: A cylinder device includes: a first piston (8) inserted in a first cylinder hole (4) so as to be movable in an axial direction, a piston rod (7) being hermetically inserted in the first piston (8), the first piston (8) being fixed to the piston rod (7); a second piston (10, 37) inserted in a second cylinder hole (5) so as to be movable in the axial direction, the piston rod (7) being inserted in the second piston (10, 37); and a partition wall (13) dividing a cylinder hole (6) into the first cylinder hole (4) and the second cylinder hole (5), the partition wall (13) being movable in the axial direction.

Abstract: A hose assembly for a pump comprising a pressurized hose, wherein the pressurized hose is exposed to pressure during at least a part of the operation of the pump, and a leak detection system comprising an outer hose concentrically positioned about at least a portion of the pressurized hose such that an annular chamber exists between the pressurized hose and the outer hose, whereby a leak of the pressurized hose can be detected by monitoring the hose assembly and/or a leak sensor associated therewith.

Abstract: The invention relates to a clamping system (1) comprising a clamping jaw (7) mounted on the shaft of a pneumatic or hydraulic cylinder (4), wherein said cylinder has a structure which drives the clamping jaw towards its clamping position when the pneumatic or hydraulic energy supply of the cylinder is interrupted, the pneumatic or hydraulic energy supply of the cylinder opposing the clamping, and where means (8) are provided for locking the cylinder when the clamping jaw is in a non-clamped position.

Abstract: Apparatus are disclosed to bias a tube towards a seal. An example apparatus includes a pneumatic actuator having a diaphragm plate, a yoke housing, and a tube. The tube conveys pressurized fluid between the yoke housing and the diaphragm plate, wherein a first end of the tube extends through a first seal gland in the diaphragm plate to form a seal against an outer surface of the tube and a second end of the tube extends through a second seal gland in the yoke housing to form a seal against the outer surface of the tube. The first end of the tube has a first cross-sectional area that is greater than a second cross-sectional area of the second end of the tube to bias the tube toward the yoke housing during operation of the pneumatic actuator.

Abstract: A device is described wherein a pair of thermal or electrothermal actuators (3, 4; 103, 104) actuate a member, such as a pinion (5), between two stable positions. The actuators are alternately activated for moving the pinion between the stable positions. For this purpose, they are arranged close to each other, so that they can act upon the pinion on opposite sides, the pinion being held in the stable positions by a releasable engagement element. The device of the invention ensures low energy consumption because the actuators (3, 4) operate only for moving the pinion from one stable position to the other.

Abstract: An apparatus includes a blowout preventer housing, a ram movable within the blowout preventer housing. The apparatus further including a rod configured to move the blowout preventer ram and including an outer surface and a piston configured to move the rod. A friction assembly is configured to engage the outer surface of the rod and prevent movement of the rod and the ram when engaged.

Abstract: A laundry washing machine (100) has a washing tub (107) in which washing/rinsing liquid may be loaded; a rotatable perforated drum (110), in which laundry (112) to be washed can be loaded; a discharge system (145, 150) fluidly connected to the washing tub (107) and adapted to selectively discharge washing/rinsing liquid from the washing tub (107), the discharge system (145, 150) including a discharge duct (150) coupled with the washing tub (107) for receiving washing/rinsing liquid to be discharged; a pump (170) operable to selectively cause washing/rinsing liquid located in the discharge duct (150) to be discharged through a drain hose (175) or to be conveyed back into the washing tub (107) through a recirculation conduit (180).

Abstract: A transmission system and method of repair having a transmission servo rod received within a transmission housing bore, the rod having an aperture disposed along an exterior surface of the rod, configured to receive transmission fluid from a port within the transmission housing bore, a first recessed groove in the exterior surface of the rod disposed above the aperture; a second recessed groove in the exterior surface of the rod disposed below the aperture; and a first and second resilient sealing member received within the first and second recessed grooves, respectively, the resilient sealing members configured to engage an inner surface of the transmission housing bore.

Abstract: The invention relates to a hybrid working cylinder (1) which may be a hydraulic or pneumatic or electric working cylinder or rotary drive and a gas spring (8) assists the stroke (H) of a piston rod (5) in a power direction and, if required, a position of the stroke (H) can be blocked by means of a stroke locking mechanism (12) or a blocking valve (21) in the event of failure of the hybrid working cylinder (1) or of the working means, the gas spring (8) can move the entire system (25, 26) into a predetermined stroke position, and the gas spring (8) is attached, in the hybrid working cylinder (1) or outside the latter, to the axles (30) or between a platform (25) and the parallelogram (26). Furthermore, the gas spring cylinder (33) of the gas spring (8, 8a, 8b) may serve as a piston rod (5).

Abstract: An apparatus for lengthening an extendible pipe comprised of first and second pipe portions having an interior includes a cylinder having an end wall and an open end connected to the first pipe portion. A piston is received in slidable and sealable engagement with the cylinder and is connected to the second pipe portion. The piston, cylinder and end wall define a chamber that is physically isolated from the interior of the pipe. Introduction of a control fluid into the chamber displaces the piston relative to the cylinder so as to lengthen the pipe. The apparatus above may be applied to a sprinkler head riser apparatus and buried as part of an in-ground sprinkler system.

Abstract: A servo for hydraulically operating a brake band of an automatic transmission includes a housing having a bore engaging portion for engaging an existing servo bore in a case of the automatic transmission and an external portion for positioning externally of the servo bore, the external portion of the housing including an interior bore. The servo also includes a piston disposed in the interior bore of the external portion of the housing for reciprocating movement, the piston being externally remote from the servo bore and having an outer diameter greater than an outer diameter of the servo bore. An actuator rod for engaging and operating the brake band of the automatic transmission is attached to the piston to reciprocate with the piston. The servo connects to existing hydraulic circuits within the servo bore to supply pressurized fluid for operating the servo.

Abstract: A double hollow rod cylinder is provided. The cylinder includes a cylinder body and a piston apparatus. The cylinder body has a hollow cylinder member with an internal cylinder cavity. The piston apparatus includes a piston, a first piston rod coupled to a first end of the piston and a second piston rod coupled to the second end of the piston. The piston apparatus is arranged such that the piston is within the cylinder cavity. The piston is fixed in place while the cylinder body is free to slide from a first position to a second position based on fluid input to the apparatus. A fluid system provides fluid to the first piston rod to move the cylinder body towards the free end of the first piston rod and fluid to the second piston rod to move the cylinder body towards the free end of the second piston rod.

Abstract: A piston rod installed to a vehicle height adjusting shock absorber includes a body portion having a hollow portion with first and second ends that are open. A step portion extends inwardly into the hollow portion a predetermined length from the first end of the hollow portion, the step portion having a thread formed on an inner surface thereof. A guide member threadly engaged to the step portion to plug the open hollow portion.

Abstract: A linear actuator for a rotating shaft assembly includes a cylinder and a piston arranged within a cavity defined by the cylinder. Faces of the piston delimit first and second chambers within the cavity. A rotatable shaft fixed to the piston defines a first main passage in fluid communication with the first chamber and a second main passage in fluid communication with the second chamber. A pressure delivery body rotatably fixed to the rotatable shaft defines a first delivery passage in fluid communication with the first main passage and a second delivery passage in fluid communication with the second main passage. A passage isolation system selectively isolates fluid communication between the first delivery passage and the first main passage and fluid communication between the second delivery passage and the second main passage. A pressure limiting system selectively blocks fluid communication through the first and second main passages.

Abstract: The concentricity and coaxiality of a central bore through a piston for a free piston Stirling machine is improved with a piston that has a sleeve with a core constructed from at least two, separate, axially-engaging core components sealed within the sleeve. During fabrication, a central bore is machined through each of the core components. The piston is assembled by heating the sleeve and cooling the core components, inserting the core components into the sleeve and then allowing the sleeve to cool and the core components to warm. This drives the core components into sealed engagement with each other and with the sleeve and aligns the central bore coaxially with the outer cylindrical surface of the sleeve.

Abstract: The invention relates to an actuator for heavy machinery including a cylinder, a piston and a protective sleeve. The cylinder forms a chamber for receiving a fluid, and includes an external flange extending radially and outwardly from the cylinder. The piston is operable to translate axially relative to the cylinder between an open position and a closed position, and includes a first extremity positioned outside the cylinder and a second extremity positioned within the chamber. The second extremity sealingly engages the chamber. The protective sleeve protects the piston in the open position, which is movable with the piston and operable to overlap at least a portion of the cylinder in the closed position. The protective sleeve includes an internal flange extending radially and inwardly from the protective sleeve and is positioned for abutting the external flange when the piston is in the open position. This abutment limits the axial translation of the piston out of the cylinder.

Abstract: The invention relates to an axial piston machine, in particular, an air-conditioning compressor for motor vehicles, with at least one piston, an essentially cylindrical piston shaft and an enclosure, which encloses a tilt ring or a tilt disc and a piston slipper sliding on said tilt ring or said tilt disc, whereby the enclosure has spherical recesses for housing the piston slipper.

Abstract: A hydraulic cylinder and associated hydraulic system that includes a sleeve cylinder in mechanical contact with a base and stationary between extended and retracted positions, which defines a second hydraulic fluid chamber. An internal cylinder is retained within the sleeve cylinder, defining a first hydraulic fluid chamber. A piston is employed having a piston rod retained within the sleeve cylinder, and a piston cap retained within the internal cylinder. An inner portion is defined between the piston cap and an interior portion of the internal cylinder. The internal cylinder is adapted to be displaced to the extended position to deliver a first power stroke upon pressurizing the first or second hydraulic chambers with hydraulic fluid. The inner portion is adapted to displace the sleeve and internal cylinder to the retracted position upon being pressurized with hydraulic fluid, to thereby deliver a second power stroke.

Abstract: Piston-cylinder unit including a working cylinder; a piston attached to a piston rod and installed with freedom of axial displacement in the working cylinder; and fastening elements, at least one of which is screwed into a threaded bore in the piston rod, where the interior pressure in the working cylinder holds a valve in the bore of the piston rod against an end surface of the fastening element. A vent groove leading to the atmosphere is provided between the end surface and the valve to create a pressure gradient to the working space, the groove being provided between the inner surface of the piston rod and the fastening element.

Abstract: In a hydraulic cylinder having a shock absorbing function, and capable of stopping as desired by an accumulator disposed within a cylinder rod. The accumulator includes an accumulator piston that divides the cylinder rod interior into first and second cylinder rod chambers, gas hermetically charged into the second cylinder rod chamber, and an accumulation port that is communicated with the first cylinder rod chamber and flows the operating oil from outside into the first cylinder rod chamber.

Abstract: The invention relates to a hydraulic cylinder comprising a piston rod bearing at least one tool receiving element. Said hydraulic cylinder is characterized by an automatic disconnection device which is controlled in a hydraulic-mechanical manner, with a medium for the actuation of the hydraulic cylinder. Said medium which is used for building-up force, is also the medium which is used for the automatic disconnection device. Said hydraulic cylinder also comprises a first valve slider and a second valve slider which are used for disconnecting the displacement of a piston, which is connected to a piston rod according to a possible obstruction found in the path of the outward moving piston rod before a desired position by deviating the medium in the region of the piston.

Abstract: A serial, multi-unit hydraulic system which utilizes a single hydraulic fluid circuit each for extending and retracting all constituent hydraulic units. The fluid circuit for retraction of a remote hydraulic unit extends through intervening, primary hydraulic unit(s), and, after retraction of the remote hydraulic unit, provides retraction oil flow to primary hydraulic unit(s). Control valves effect a prescribed sequence of extension and retraction of the constituent hydraulic units, without involving separate, external control apparatuses.

Abstract: According to the present disclosure, a fluid cylinder is provided that is configured to move an object between first and second positions. The fluid cylinder includes a cylinder housing and a shaft configured to move between extended and retracted positions relative to the cylinder housing. Preferably, the fluid cylinder includes a scraper positioned to contact an outer surface of the shaft to remove contaminants therefrom during movement of the shaft. Furthermore, the preferred fluid cylinder includes an anti-rotation mechanism positioned to prevent rotation of the shaft.

Abstract: A device, preferably hydraulic, is connectable to a first body and a second body selectively forming a rigid connection therebetween or allowing relative motion. The device includes a cylinder having a chamber. The cylinder is connectable to one of the bodies. A piston rod is connectable to the other body. A tension rod has a piston slidable in the chamber and is coupled to the piston rod for slidable movement relative thereto. A second piston is slidable in the chamber and slidable relative to the tension rod.

Abstract: The hydraulic or pneumatic drive for lifting and lowering loads, in particular for lifts, has a working cylinder (11) forming a pressure chamber (14) connected to a pressure fluid source (39) and subjected to a pressure fluid. It also has a lifting piston (1) tightly guided in the working cylinder and a guide rod (15) arranged in the working cylinder. The guide rod (15) projects into the interior of the lifting piston (1) which tightly encloses the guide rod (15). The end (4) of the lifting piston (1) which projects into the pressure chamber (14) forms an annular face (5) which is subjected to pressure fluid. The interior of the lifting piston (1) forms an additional pressure chamber (7) subjected to pressure fluid and which is connected to its own pressure fluid source (40).

Abstract: A hydraulic cylinder in which the cylinder head contains a motor-driven fluid pump, fluid reservoir, and a main control valve for the cylinder. The cylinder includes a transfer tube that extends through the center of the cylinder's piston and terminates within a hollow ported section of a piston rod. The cylinder head can additionally include two electrically-actuated pilot valves and two pilot-operated check valves. The pilot-operated check valves include structure that, in combination with passages in the cylinder head, cause both pilot-operated check valves to open when pressurized fluid is being directed to one of the pilot-operated check valves by the main control valve.

Abstract: The invention relates to a clamping cylinder for operating, for instance, a chuck by means of a pull pipe or pull rod installed preferably in a turning machine. The clamping cylinder has a cylinder casing (4) comprising a screwed-on cover plate (5), an axially displaceable piston (12) in the work chamber (11) of the cylinder casing (4) to produce the clamping force and a distributor (2) fixed onto one of the cylinder casing faces with ports and pressure lines for supplying and discharging a pressure oil to and from the work chamber of the piston. According to the invention, the cylinder casing (4), its lid (5) and the distributor casing are made of a light metal in order to reduce inertia moments and wear and to improve lubrication and heat dissipation. The walls of the locating bores for the piston (12) and/or its piston rods (13, 22) are hard coated. The piston and its two piston rods are made in a single piece from a tool steel and their respective contact surfaces are hard chrome coated.

Abstract: A placement and orienting apparatus for a pump and water passing pipe assembly includes a wheeled trailer supporting the pump and water passing pipe assembly; an upper frame structure; a lower frame structure; a turntable bearing assembly positioned between and interconnecting the upper and lower frame assemblies and permitting rotation of the upper frame structure relative to the lower frame structure; a motor drivably connected to one of the upper frame structure, the lower frame structure and the turntable bearing assembly to rotate the upper frame structure and the trailer relative to the lower frame structure and the ground; and at least one upright hydraulic cylinder having a cylinder lower end connected to the upper frame structure and having a cylinder upper end connected to the trailer to drive the upper and lower frame assemblies downwardly together from the trailer so that the lower frame structure makes contact with the ground and elevates the trailer from the ground.

Abstract: A sorting mechanism for use in apparatus for sorting debris, unripe and ripe comestibles including a paddle and a drive cylinder for moving a bearing supported shaft which drives the paddle and a skirt for protecting the bearing.

Abstract: A spring brake actuator (10), with a large-force compression spring (82) in a second spring chamber (78) of the housing, has vent openings (100) in the housing communicating with the second spring chamber (78). A filter assembly (134) covers the vent openings (100). Weep holes (62), (104), (102), and (100) in a sleeve (50) of an push rod (18), in a spring brake actuator rod (84), and in a spring brake housing portion (68) together permit fluid compressed in a first service brake chamber (30) to flow through a conduit define by these weep holes out of the brake actuator (10) wherein it is filtered by the filter assembly (134).

Abstract: Valves 4,5 are disposed in such a portion which is defined in an end portion of a piston 30 of an adjusting cylinder body 1 and which does not contact a load giving body 7, thereby preventing deformation by compression caused in incorporation positions of the valves 4,5 and leakage of a filling within the cylinder body 1.

Abstract: A linear thruster is disclosed in which a load beam is linearly moved relative to a guide beam by fluid power. One or both of the beams are multisided in cross-section to substantially increase the linear bearing area between the beams and substantially increase the strength of the linear thruster against side forces as well as moments while permitting a substantial reduction in the volumetric space consumed by the linear thruster. The fluid power and the energy inputs to the linear thruster may all be positioned at one end of the guide beam.

Abstract: An hydraulic servo device for a friction brake in a planetary transmission for motor vehicles contains a cylinder with stepped interior wall, a stationary dividing wall that has a hole and divides the interior of the cylinder into two regions, one piston in each of the two regions formed by the dividing wall, and a hollow piston rod that passes through the hole of the dividing wall and connects the two pistons. The wall of the cylinder has passages, through which a pressure medium enters or exits the cylinder, in each one of the regions formed by the dividing wall. The pistons in each of the regions of the cylinder divides each of the regions into an application-pressure chamber and a release-pressure chamber, forming four chambers in the order of an application-pressure chamber, a release-pressure chamber, an application-pressure chamber, and a release-pressure chamber. The hollow piston rod has openings which allow the pressure medium to enter or exit the piston rod and the application-pressure chambers.

Abstract: A forming die set has one or more independently operated hydraulic actuator assemblies mounted directly in one of the die shoes to enable a programmed piercing pattern to be carried out at the time the workpiece is formed. Each actuator assembly includes a compact self contained actuator, in which both a piston and piston rod and a punch retainer are slidable in different sections of a housing bore with supply and return connections both through an end cap of the cylinder housing with a return flow path through a tube extending through the piston. The piston rod extends through an annular rod gland member positioned in the cylinder housing bore, and has an end protruding through to a punch retainer to which it is coupled. The punch retainer is slidable in a section of the cylinder housing bore. A purging system using a check valve in the supply line establishes an incremental flow back to the reservoir eliminate air bubbles.

Abstract: A compact drive cylinder with a cylinder barrel, an end cap and a guide cap is provided. In the cylinder barrel an axially sliding piston is arranged, on which a piston rod is mounted which extends through the guide cap. The piston divides a thrust chamber off in a fluid-tight manner chamber from a return chamber, the thrust chamber being connected with a thrust chamber port and the return chamber being connected with a return chamber port respectively in a fluid-tight fashion. Both the thrust chamber port and also the return chamber port are arranged in the end cap. An axially extending abutment rod having an abutment extends through the end cap and has its internal end extending through the piston into the return chamber so that an abutment for the piston is located in the return chamber.

Abstract: A fluid power operated advancing unit has housing and a plunger adapted to run axially therein. The plunger is designed in the form of a three sided prismatic body at least along its length section running in the housing, said body being guided in the housing at its three side surface, whereas three transitions between respective adjacent side are not guided. The result is accordingly an extremely accurate guiding action for the plunger while simultaneously preventing rotation thereof.

Abstract: A roller-control unit for a continuously-variable-ratio transmission of the toroidal-race rolling-traction type, in which the roller carriage (10, 14) is connected by a pivotal joint (30) to the piston (15) of a hydraulic piston-and-cylinder unit (15, 16). The piston (15) is double-acting, and the piston/cylinder contact is the only locus through which the roller carriage (10, 14) makes contact with the fixed structure of the transmission. The piston (15) may have an inner part (32) to which the roller carriage (10, 14) is jointed, and a sleeve-like outer part (33, 34) which makes the necessary sliding and sealing contacts with the cylinder (16), but allows the roller carriage (10, 14) the necessary freedom of pivoting movement during use.

Abstract: The pump is formed by a body having a cavity with a cylindrical chamber in which a piston is reciprocated toward and away from an inlet and outlet aperture. A crank shaft extends through an aperture formed through the piston transverse to its axis and through opposite walls of the cavity. The crank shaft has a cam located in the piston aperture. Upon rotation of the crank shaft, the cam alternately engages opposite facing cam surfaces of the piston in the piston aperture to reciprocate the piston to draw fluid into the chamber from an inlet path and then to pump the fluid out through an outlet path. The piston has spaced apart O-rings on its outer wall which engage the chamber wall upon reciprocation of the piston.

Abstract: A pneumatically actuated lubricant pump wherein air is forced into the cylinder through a passage extending longitudinally through the piston rod. The rod is part of a piston assembly reciprocably mounted within a pump housing. The air passage extends from a lateral rod entrance through the rod and through the piston head. Air is forced into and released from the air cylinder through the passageway. In an alternative double-action embodiment, a second air flow passage extends through the pump housing alone directly to the air cylinder permitting compressed air to be alternately supplied to the opposite sides of the piston head.

Abstract: A pneumatic actuating drive (1, 61) for final control elements comprises a drive housing (6) and a drive component (15) movable therein, to which the drive component (15) is attached a drive element (24) that exits from the drive housing (6) and that can be moved together with the drive component (15), and which has the function of actuating the actuator (1, 61) and which divides the drive housing (6) into a pressure chamber (16) and a reset chamber (17) with a reset element (19, 20) that acts on the drive component (15). The actuating drive (1, 61) furthermore comprises a position controller (41) whose output (48) merges into an internal supply duct (49), which is connected to a transfer connection (35, 62) on the reset chamber side on the drive element (24), whereby the drive element (24) exhibits an air duct (30), which originates from the transfer connection (35, 62) and merges into the air duct (30).

Abstract: A fluid-powered rotary actuator having a body with a cylindrical interior sidewall portion. A drive shaft extends generally coaxially within the body and is supported for rotation relative thereto. The shaft has a grooved, outwardly facing circumferential sidewall portion positioned within the body. A ring gear is positioned generally coaxially within the body and extends about the shaft with an annular space therebetween. The ring gear has a grooved, inwardly facing circumferential sidewall portion. The ring gear is formed as a separate part from the body and the ring gear grooved sidewall portion is formed prior to positioning of the ring gear in the body. The ring gear is fixedly attached to the body to prevent rotation therebetween by a weld between the ring gear and the body interior sidewall portion. A stop member is engaged by the ring gear. The stop member is axially located within the body to limit movement of the ring gear toward the body first end during assembly of the ring gear in the body.

Abstract: A linear hydraulic motor including a first piston rod (12) and piston head (16), a second piston rod (18) and piston head (26), and a cylinder housing (30), having a divider wall (46), adapted to reciprocate longitudinally on the piston heads (16, 26). The cylinder housing (30) has end members (34, 36) through which piston rods (12, 18) extend. Four fluid chambers (52, 54, 56, 58) are formed within the linear hydraulic motor. Fluid chambers (52, 56) communicate with each other through conduits (62), and fluid chambers (54, 58) communicate with each other through conduit (64). Piston rods (12, 18) include conduits (68, 70) for fluid communication with chambers (54, 56). A snubber (74) is provided in the divider wall (46) of the cylinder housing (30). The snubber (74) reciprocates within the divider wall (46) and is adapted to abut the inner ends of the piston rods (12, 18) as the divider wall (46) approaches piston heads (16, 26) during the reciprocating process.

Abstract: A slidably attachable, automated means for opening and closing the die halves of a casting machine. Cylinders are provided having integral vertical side grooves for mounting on said casting machines and the like. The preferred hydraulic cylinder has a hollow piston rod connected to the piston and projecting from one end of the cylinder. A fluid flow line movable within the cylinder projects from the other end of the cylinder and slidably passes through the piston into the piston rod. Separate elements contact the piston at opposite ends of its stroke to move the fluid flow line and switch the fluid flow in the cylinder.

Abstract: A pressure cylinder in which the piston is hollow and the pressurized fluid is introduced into the hollow of the piston. The cylinder housing includes a core member with supply and exhaust ports. An area between the rear wall of the housing and a rear wall of the piston is exposed to atmospheric pressure at all times, elliminating a need for seals on the outside surface of the piston, and allowing for the piston to be exposed to large transverse forces. Proximity switches are provided in a slot in the upper wall of the cylinder housing to detect the arrival of the piston at its limit positions and a pin secured to the cylinder housing engages a slot in the outer periphery of the piston to guide the forward and rearward movement of the piston within the cylinder. A slot may be provided in the upper wall of the cylinder housing for receipt of a work positioning member secured to the outer periphery of the piston.

Abstract: A pneumatic control drive 1, 51, 71 for control devices, in particular control valves, comprises a drive housing 5 and a drive member 11 displaceable therein and to which is affixed a drive element 18 displaceable together with said drive member 11 to actuate the control device and exiting the drive housing 5, said drive member dividing the drive housing 5 into a pressure chamber 12 and a reset chamber 13 with a reset member 15, 16 loading the drive member 11. A position controller 3 is adjacent to one of the chambers (13) and communicates through an inner air-supply duct 30, 28, 55, 74 with the pressure chamber 12, a vent duct 35, 58, 76 issuing from the reset chamber 13 toward a vent aperture. In the invention, the drive element 18 comprises an air-supply duct 24, 25 issuing at the side of the drive member 11 away from the position controller 3 into the pressure chamber 12 there.

Abstract: This invention is directed to a new and novel envelope for housing a servo mechanism adapted to control a brake assembly used in conjunction with a vehicular transmission. The envelope is adapted to be demountably received within a receptacle provided in the transmission case. A pilot bore penetrates the transmission case and is located axially of the receptacle. The envelope incorporates a base portion, a cap portion and a coupler portion. A servo-apply pin extends outwardly through the coupler portion of the envelope to be reciprocatingly received within the pilot bore. A piston chamber is provided interiorly of the base and cap portions. An actuating piston is operatively received in the piston chamber, and means are included to effect communication of hydraulic pressure from a conduit within the transmission case, through the coupler portion of the envelope and the servo-apply pin into the piston chamber. Locking means are also provided selectively to secure the envelope to the transmission case.

Abstract: A fluid operable engine has a cylinder in which a piston slides up and down. The cylinder has a cylinder wall and two end walls. The piston divides the cylinder into two chambers. The piston is hollow, has a cylindrical wall and two end walls, with a rigid tube extending from and through one end wall of the piston through an adjacent end wall of the cylinder so that the interior of the piston communicates with the exterior through the tube. The cylinder has an aperture in each end wall or in its cylindrical wall close to the end walls and the piston has an opening in each of its end walls. A closure member is provided for alternately closing the openings or the apertures as the piston reaches each end wall. The engine is operated either in a positive or negative manner, with fluid being charged into or sucked from the piston or the cylinder. The openings may be closed from within or without and the apertures may be closed from inside or outside. The closure member may be mechanically or fluid operable.