Abstract: The invention relates to a reversible radial vane air motor with manual speed control that is capable of attaining excellent forward horsepower. The invention includes a bypass air passage and an exhaust deflector that routes pressurized air through the backside of the motor when the motor is operated in reverse. A reverse control lever controls the flow of air through the bypass passage and opens a reverse exhaust passage. The motor may also be equipped with a centrifugal governor for controlling the flow of air in the forward operation with the governor being bypassed in reverse operation.

Abstract: A housing of a rotary piston internal combustion engine of trochoidal type of construction consists of two side parts and at least one mantle part with dual-curvature mantle runway and a center part between the two mantle parts, which parts are connected by adjustable bolts directed axially as arranged along the radial periphery of the housing. An eccentric shaft passes through the housing and a triangular rotary piston turns upon the eccentric of the eccentric shaft. Clamping rings are provided at each of two ends of the housing.

Abstract: A compressor has a hermetic shell defining a compression chamber for compressing a fluid such as refrigerant gas supplied therein. The compressed gas is discharged from the compression chamber through a discharge port. A valve arrangement is provided at the discharge port for permitting the flow of the gas only in one direction from the inside to the outside of the compression chamber. The valve arrangement comprises first and second resilient elongated plates each having first and second ends. The first ends of the first and second elongated plates are rigidly connected to the hermetic shell and the second ends are placed one on top of the other over the discharge port. The second end of the first elongated plate on the discharged port is formed with at least one opening so that the pressurized gas discharged from the discharge port hits partly on the first plate and partly on the second plate through the opening.

Abstract: A slide vane type compressor comprises a cam ring formed with at least one working chamber and a rotor arranged in the at least one working chamber with an outer peripheral surface of the rotor being disposed close to an inner wall surface of the cam ring at least at one axial sealing portion thereof, with the rotor being formed vane grooves for respectively accommodating a plurality of vanes. At least one suction port introduces gas into the at least one working chamber, with the suction port having a suction terminal point angle extending from the axial sealing portion to a terminal point of the suction port, as viewed in the direction of rotation of the rotor.

Abstract: A rotary fluid pressure device is disclosed comprising a housing having fluid inlet and outlet means and enclosing a gerotor having an internally toothed member and a coacting externally toothed member having a less number of teeth than the internally toothed member and having its axis positioned eccentrically relative to the axis of the internally toothed member. A wobble stick in the housing has a first end connected to the axial drive shaft and a second end connected to the gerotor member having the orbital movement. The housing has one set of passageways communicating at all times with the expanding and contracting gerotor cells. The gerotor member having orbital movement is, in addition to its usual function, a valve with two travel passageways, one travel passageway coaxially surrounding the other passageway.

Abstract: A cylinder has at least one valve seating surface-forming portion which has an outer surface formed therein with at least one recess, the bottom surface of which serves as a valve seating surface. A discharge valve is arranged on the valve seating surface-forming portion to close or open outlet holes each formed in corresponding ones of the valve seating surface. The discharge valve has at least one valve body formed of an elastic plate member disposed in close contact with a corresponding one of the valve seating surface. Preferably, the valve seating surface is arcuately concavely curved and the corresponding valve body has a correspondingly curved surface. The outlet holes are each formed in a thinnest portion of the valve seating surface-forming portion.

Abstract: A hydraulic pump of the type in which a cam ring and rotor are mounted within a rotor chamber formed between a cover and housing fixedly mounted together. An adjustment screw extends into the rotor chamber transverse to the axis of rotation for adjusting the level of the cam ring. Two pairs of bolts, and only two pairs, extend parallel to the rotation axis at a given radius from that axis to fix together the housing and cover. The distance between the pair of bolts on either side of the adjustment screw and at the pressure region are less than the distance betwen the bolts of the opposite pair at the suction region. Further the angle .beta. between an x-x axis transverse to both the adjustment axis and the rotation axis and the radii of the pair of bolts on either side of the adjustment screw is between 60.degree. and 75.degree. and the angly .gamma. between the x-x axis and the radii of the other pair of bolts is between 25.degree. and 40.degree.

Abstract: The tool housing-air motor assembly includes an air motor that is of modular design, that is, it is constructed so that the motor rotor is journaled in the cylinder by the end plates, which retain the motor in its operational alignment condition. The tool housing is used in the "as cast" condition without the necessity for performing any machining operations thereon. The assembly of the air motor and tool housing is possible since the motor is self-contained and does not rely on the tool housing for retaining the parts of the motor in assembled relationship or for retaining the motor parts in operational alignment.

Abstract: The invention pertains to a lightweight and concise vaccum pump particularly suitable for servicing refrigeration systems. One end of a cylindrical electric motor casing is enclosed by a substantially cylindrical adapter upon which a pump assembly is mounted. The motor armature shaft extends through the adapter and the pump rotor is directly mounted thereon. A hollow shell affixed to the adapter encompasses the pump assembly defining a chamber thereabout which includes a lubrication sump. A synthetic plastic handle assembly attaches to the motor casing and includes a capacitor housing and a base is affixed to the lower side of the casing. Except for the handle and base the pump is of a substantially cylindrical configuration of a diameter similar to that of the motor casing, and the pump assembly includes lubrication and exhaust features which provide improved pumping conditions.

Abstract: A movable vane type compressor having a rotor rotatable within a cam cylinder. The inner peripheral surface of the cam cylinder and the outer peripheral surface of the rotor approach each other most closely at a plurality of positions which in combination define a plurality of compression chambers between these peripheral surfaces. The rotor carries a plurality of movable vanes which are movable radially inwardly and outwardly with their one ends held in sliding contact with the inner peripheral surface of the cam cylinder as the rotor rotates so as to cause suction, compression and discharge actions in each compression chamber. A refrigerant passage for introducing the refrigerant gas into the compression chambers is formed between the side plate closing one axial end of the cam cylinder and a front cover covering the side plate. The suction passage extends in a hook-like form in the direction of rotation of the rotor.

Abstract: In a hermetic type compressor including a casing, an electric motor provided in the casing for rotating a driving shaft, and a compressor unit including a cylinder forcibly inserted in the casing, there are provided a method and a device for securing the compressor unit to the casing, wherein reduced thickness portions are provided on the outer surface of the casing so that welding can be carried out from outside of the casing through the reduced thickness portions. In this manner, heat generated in the welded portions can be reduced substantially, and various disadvantages caused thereby can be eliminated.

Abstract: A gear reversal mechanism for a hand held power tool is selectively operative to reverse the output of a unidirectional motor and provides a direct drive forward mode and an indirect drive reverse mode, with the selection therebetween being implemented by a manual shift collar operating a cam mechanism selectively to reorient the gear train and consequent direction of motor output. The shift collar is temporarily locked to the gear housing during tool operation by using the operative air pressure of the tool to expand a locking mechanism into locking engagement with such shift collar. With or without the locking mechanism, an exhaust shutoff shift interlock may be provided to permit exhaust air to exit the housing when the shift collar is in either its forward or reverse operating positions or alternatively to close the housing exhaust ports to block exhaust air flow to preclude motor operation when the shift collar is between its operating positions.

Abstract: In a vane pump, the cam ring must be fixed to an annular recessed portion of the housing in such a way that there exists no eccentricity between the cam ring and the rotor. To eliminate an eccentricity, a pair of semicircular grooves are formed on the inner circumference of the annular recessed portion diametrically opposed to the center thereof; a pair of semicircular grooves are formed on the outer circumference of the cam ring also diametrically opposed to the center thereof so as to provide two locating pin holes in cooperation with the two housing grooves, respectively; a pair of locating pins are pressure fitted, respectively, to the locating pin holes. Further, it is possible forcibly correct an eccentricity by selecting a locating pin having a diameter appropriately larger than that of the pin hole. The two locating pin holes are arranged in the direction of belt tension to eliminate the eccentricity due to belt tension.

Abstract: A rotor for a rotary slide-vane vacuum pump and a method of producing same comprises providing two rotor sections, each having a shaft stub, a rotor portion and a plane or contact surface produced by lathing, forming axial slot portions for accommodate one or more slide vanes through the contact surfaces, assembling the two rotor sections by the use of an assembling jig and fixedly joining the sections together and finishing the external surfaces of the assembled rotor with respect to at least one of length and diameter while the rotor is held in one and the same fixture.

Abstract: In a hermetic type compressor including a casing, an electric motor provided in the casing for rotating a driving shaft, and a compressor unit including a cylinder forcibly inserted in the casing, there are provided a method and a device for securing the compressor unit to the casing, wherein reduced thickness portions are provided on the outer surface of the casing so that welding can be carried out from outside of the casing through the reduced thickness portions. In this manner, heat generated in the welded portions can be reduced substantially, and various disadvantages caused thereby can be eliminated.

Abstract: A rotor cover is disposed at one end surface of a rotor which has a ring-shaped locking ridge on the end surface thereof. The locking ridge has an outer peripheral surface fitted in a locking groove in the rotor cover. A holder is held against an inner peripheral surface of the locking ridge. With this arrangement, the diameter of the rotor is kept constant at all times, and so is the gap between the rotor and the housing, thus preventing scuffing of the rotor and the housing.

Abstract: An improved pump assembly includes a plurality of pumping elements which rotate with a rotor and engage an inner surface of a cam ring to define pumping chambers which hold liquid and/or air. As the pumping chambers move along an inlet arc, liquid flows through an orifice to the chambers. The orifice restricts the rate of flow of liquid to the pumping chambers to a flow rate which is insufficient to fill the chambers with liquid during high speed rotation of the rotor. As the pumping chambers move along an outlet arc which has a constant slope toward the rotor, the volume of each pumping chamber is decreased. When the fluid pressure in the pumping chamber exceeds a pump discharge pressure, one of a series of a check valves opens and fluid is discharged from the pumping chamber.

Abstract: A rotary compressor comprises a rotor, a cylinder having an inner surface slidably contacting the rotor at one or more portions thereof, side plates disposed on both sides of the cylinder for supporting a rotor driving shaft, and axial insert type discharge valves disposed inside the cylinder. The cylinder includes an inner cylinder having an inner surface slidably contacting the rotor, and an outer cylinder surrounding the whole of the outer periphery of the inner cylinder.

Abstract: A rotary vane compressor directed to increasing the gas charging efficiency is disclosed. A side block is formed with an opening which is extended such that radially outer part of its rim is located radially outwardly of the inner periphery of a cylinder. The inner periphery of the cylinder is partly removed to form a notch such that the notch is aligned with the outer part of the rim of the opening. The opening and the notch define a suction port in combination, that is, the available area of opening of the suction port is increased by the proportion of the notch. Gas is sucked into the compressor not only sidewise but also in the peripheral direction.

Abstract: A vane compressor is provided which has a rotor formed therein with a plurality of axial slits opening in its outer peripheral surface in a circumferentially spaced arrangement, and in each of which a vane is received, and a plurality of cavities located between adjacent ones of the axial slits. The rotor is formed of at least two rotor elements integrally joined in an axial alignment, each rotor element being formed of a sintered alloy compact. The rotor elements are brazed along their end faces abutting against each other.

Abstract: In a rotary vane compressor of the type including a rotor formed with a plurality of radial vanes and positioned in an inner wall of the housing, with which wall the rotor forms a working chamber with a low pressure portion and a high pressure portion, a plurality of colling medium-outlet bores, formed in the housing inner wall and associated with the high pressure portion, are arranged in recesses provided in the inner wall and open at the outer side thereof. These recesses accommodate flap valves normally closing the outlet bores. A number of reinforcing ribs are formed on the inner wall of the housing which separate the adjacent recesses from each other.

Abstract: A pump means has a housing having a cylindrical inner peripheral surface, a disc secured to the housing to constitute a working chamber together with it and provided with a central opening eccentric to the center of the inner peripheral surface of the housing, a rotor rotatively contained within the working chamber and adapted to be drivingly connected to a shaft introduced into the working chamber through the central opening of the disc, a number of radial vanes shiftably received within slots formed in the rotor and adapted to have their outer ends shiftably abut the cylindrical inner peripheral surface of the housing, and overlapping portions formed by a portion of the disc and a portion of the rotor so as to be in an overlapping relationship with each other in the direction of the shaft in a contacting or non-contacting state with each other.

Abstract: A compressor rotary mounting shaft for rotatably mounting a compressor rotor is supported by a bearing surface defined by a bearing surface hole through a compressor cylinder block. A portion of the rotary mounting shaft is tapered, and the tapered portion of the rotary mounting shaft confronts a portion of the bearing surface which is cooled by refrigerant gas and which is cooled by refrigerant gas and which contracts during operating of the compressor. The tapered portion of the rotary mounting shaft ensures that sufficient clearance remains between the rotary mounting shaft and the portion of the bearing surface hole that contracts during compressor operation so as to allow the formation of a lubricating oil film to prevent shaft locking due to thermal contraction of the bearing surface hole or eccentric driving of the rotary mounting shaft.

Abstract: A pump or motor comprising a casing, housing at least one rotary member and having an inlet port and an outlet port, cam means rotatable by said member and a fluid displacement device which is driven by the cam means and which includes at least one reciprocable element. This element, upon rotation of said member through each revolution, so repeatedly projects into a chamber in the casing which is in communication with one of said ports as to effect a series of momentary decreases in the effective volume of that chamber and the element is also so repeatedly retracted from that chamber as to effect a series of momentary increases in the effective volume of the chamber. In this way momentary flow of fluid is caused repeatedly to occur out from, and back into, the chamber thereby substantially reducing pulsation of flow through the pump or motor, and also attendant noise, during operation.

Abstract: A pneumatic power tool for tightening screw joints includes a primary motor 11 for the high speed running down sequence and a secondary motor 12 for the high torque final tightening sequence. The tool includes a coupling gearing 18 providing a high ratio gearing for the secondary motor 12, a gearing of a substantially lower ratio for the primary motor 11 and a one-way clutch 30 by which the secondary motor 12 is automatically engaged at decreasing tightening speed. An air supply valve 33 is employed to substantially reduce the air consumption of the tool by keeping the air supply to the secondary motor 12 shut off until a certain degree of tightness in the joint is obtained, after the valve 33 is opened and the secondary motor 12 is energized.A reduction gearing 19 is supported in a casing 90 which is rotatively connected to the tool housing 10 and provided with a laterally extending torque reaction bar 92.

Abstract: A rotary internal combustion engine comprises a stator having an enclosed chamber defined by a pair of opposing side walls and a peripheral wall extending therebetween. A rotor in the chamber is rotatable by a shaft extending between the side walls. The rotor has at least one arm projecting radially from the shaft and a rotator member pivotally mounted on the end of the arm by a pivot pin. The rotator member has a working surface which spans between the side walls and has leading and trailing surfaces in contact with the peripheral wall, thereby defining a combustion chamber. Air is introduced into the chamber by at least one outlet passage which is rotatable within the chamber and opens radially, with respect to the shaft, into the chamber.

Abstract: The disclosure is directed to an improved rotary compressor of a closed type which is provided with a pressure introducing passage communicated at its one end, with a compression space within a cylinder, and at its other end, with a small volume space formed in the cylinder portion for reducing high frequency component in the cylinder inner pressure so as to reduce undesirable noises during operation of the compressor.

Abstract: A rotary fluid motor with an internal liner has an internal manifold system within the casing and liner which provides not only separations for the fluid involved, but cooling fins and a structural support for the liner. The function of the internal manifold is to provide cooling fins which is important for adequate cooling of the motor during operating.

Abstract: A delivery valve assembly, especially for a rotary mechanism, such as a compressor, disposed within a valve chamber of a peripheral wall of a housing, which includes a stop disposed within the chamber, a valve seat formed in an end-wall disposed across an outer end of the chamber, and a movable valve element having an open and closed position. The valve element is generally rectangularly shaped in cross-section and comprises a resilient plannar inner portion disposed against the valve seat when it is closed and against the stop when opened. Springs, in the form of a pair of strips are fixedly attached at one end to the peripheral wall and extend across the outer end of the chamber, are attached at their other ends to the inner portion via a pair of side portions. These side portions are resilient and are in substantially opposed relationship.

Abstract: A power steering pump includes a pump housing (12) and a chambered sheet metal casing (14) around the pump housing. The pump housing and casing cooperate to define a fluid reservoir (22) for the power steering system. The pump housing defines a cylindrical outer surface (30) and the casing defines a circular opening (24) through which the pump housing extends into the casing chamber. An annular groove (32) circumscribes the pump housing cylindrical surface and receives an O-ring seal (34). An annular rim (36) is defined by the casing around the opening into the chamber. The annular rim (36) extends parallel to and closely adjacent the cylindrical outer surface (30) of the pump housing and cooperates with the O-ring (34) to effect a fluid-tight seal between the pump housing and casing. The casing is rotatable relative to the pump housing so that the fluid reservoir is adjustably positionable rotatably relative to the pump housing.

Abstract: A rotary compressor having a discharge check valve and a retainer assembly in which the valve is a reed type valve mounted on the retainer and the retainer having spaced locating projections for positioning the assembly in a valve chamber. The retainer has a projection dimensioned to engage between the retainer main body portion and one wall of the valve chamber to create a continuous radius free from flat spots for the valve to engage in its open position.

Abstract: A compressor-expander having a vaned rotor in which the vanes rotate about an axis which is canted with respect to the rotor axis. The housing of the device has a disc-shaped main cavity having adjacent hub recesses which are concentrically spherical. The cavity is in the form of a doubly truncated sphere canted with respect to the shaft axis. The rotor has a central spherical portion for mating with the recesses and includes an integral Saturn-like ring extending to the outer wall of the cavity to divide the cavity into first and second complementary sides of annular wedge shape. The vanes occupy radially extending slots in the rotor and serve to separate each side into successive chambers which vary cyclically in volume as the shaft rotates without requiring the vanes to bodily reciprocate either radially or axially. Each side is provided with inlet and outlet ports.

Abstract: A mode of assembly for a vane pump rotor and drive shaft provides a construction wherein a plain, i.e., sleeve or collar type bearing can be used for the support of the drive shaft. The arrangement affords axial positional securing, i.e., axial fixation of the drive shaft with a spring ring peripherally confined by a recess in the pump rotor to prevent its being dislodged and thus affording safety in maintaining axial securement of the drive shaft.

Abstract: An air distributor for the supply of a blade-type motor which can be rotated about its axis by means of a sleeve with which it is integral external to a casing, the rear end plate of the blade-type motor being constituted by a ring traversed by at least three openings which are off set at angles of 120.degree., characterized in that the end of the distributor facing the said ring is shaped so as to form, on the one hand, a chamber causing the outlet openings of the motor block to communicate with one or more outlet pipes for the air toward the exterior traversing the distributor and, on the other hand, a surface in direct contact with the said ring, on which surface there merges a feed duct for air traversing the said distributor originating from the compressed air source.Application: to hand-held dental instruments.

Abstract: A fastening system particularly suited for securing parts of a rotor of a slant axis rotary mechanism together including links (110) abutting each of the rotor parts (60, 62), and spanning the interface (ABCD) between the parts. Pivotal nut structures (108) are journalled in the ends of the links and linear passageways (90) are disposed in the rotor parts to be nominally aligned with the nut structures. The passageways are at an acute angle to the rotor axis and terminate in a shoulder (100) at their ends remote from the nut structures. Threaded, headed fasteners have their heads (98) in operative engagement with corresponding ones of the shoulders and extend through the passageways to be threadably received by the corresponding nut structures to tension the associated links and thereby hold the rotor parts in assembled relation.

Abstract: An oil pump is disclosed having a pressure pipe which is coaxially disposed within a suction pipe to provide a shielding of the pressure pipe. Both the suction pipe and the pressure pipe are arranged parallel to a vertical axis of a housing of the pump. An oil-jet ejector is connected to the interior of the pump housing through openings which provide a continuous venting of the oil flow within the pump. The venting is provided on both the intake and discharge ends of the pump.

Abstract: A rotary piston compressor including a main housing part composed of a plurality of interconnected components one of which has a trochoidal two arc-shaped inner surface forming a race way, and a triangular piston rotatable in the eccentric of an eccentric shaft. The corners of the triangular piston are in continuous sliding contact with the race way. The components are surrounded by a capsule housing which on one side of the compressor has a pressure connection arranged in a dome-shaped cover. This cover includes a hood separating the high pressure section from the low pressure section. The cover is connected to the hood by a central member forming a connection for the inlet conduit. The hood sealingly engages a step in the adjacent housing component.

Abstract: A hand held machine tool intended for grinding and like operations, having an outer housing containing a pneumatic vane motor by which a tool carrying spindle is rotated. At its forward end, the motor is supported in the housing by at least one resilient O-ring for absorbing radial vibrations arising in the spindle during work and a conical thrust ball bearing for transferring axial load to the housing without restraining the radial resiliency provided by the at least one O-ring. At its rear end, the motor is supported in the housing by a substantially non-resilient O-ring, which means that the motor is apt to perform a pendular movement about its rear end when exposed to vibrations from the spindle.

Abstract: The disclosure is directed to a rotary engine having an annular housing with at least three internal walls equiangularly disposed about a central axis. At least two sliding pistons are disposed within the housing and in sliding contact with the walls. Two rotating valving assemblies enclose the opposite sides of the sliding pistons so that as the pistons slide, intake and compression chambers are formed. The valving assemblies sequentially provide the charge and exhaust of the engine. The sliding pistons are coupled to a central shaft and provide torque for the shaft.

Abstract: A rotary compressor includes housing means in which an impeller is rotatably mounted.

Abstract: A pressure valve, especially for rotary piston compressors, which includes a valve housing in the form of a cylindrical sleeve which latter has circumferential through-flow openings or slots which from the inside of the sleeve are covered by a valve closure member comprising resilient lamellae. The valve closure member comprises a pre-bent pre-loaded lattice or grate-shaped metal sheet with parallel longitudinal strips forming the resilient lamellae the ends of which are respectively interconnected by two rim strips. These rim strips rest against both sides of an abutment or counter bearing located opposite the through-flow openings. In the closing position of the valve, the valve closure member tightly engages that inner surface of the sleeve which surrounds the through-flow opening or openings in the sleeve, whereas in the open position of the valve the valve closure member rests against two nearly diametrically oppositely located areas of the inner wall of the sleeve.

Abstract: A sliding vane compressor has a housing and a rotor mounted in the housing. The rotor has axial endfaces which are juxtaposed with respective housing surfaces from which they must be kept at a predetermined spacing. This spacing is obtained by mounting in open recesses of the axial rotor endfaces respective elements of a material having a higher coefficient of thermal expansion than the material of the rotor itself. As the compressor comes up to operating temperatures the resulting thermal expansion of these elements causes them to protrude beyond the axial rotor endfaces by a distance corresponding to the desired spacing.

Abstract: A torque-amplifying hydraulic servo-mechanism of the kind including a rotary hydraulic motor and a hydraulic distributor, said motor being of the sliding vane type and the distributor of the "face", open center type. According to the invention, the rotor (50) of the hydraulic motor includes two diametrically opposite cylindrical surfaces (90) in contact with the stator bore and each extending over an arc equal to that between two adjacent vanes (24), and two interconnecting portions each having two flat faces (106, 108) interconnected by a cylindrical surface portion (104); and the number of vanes (94) is advantageously four times the number of said surfaces ( 90), that is eight. The servo-mechanism thus designed may be advantageously used in power steering systems for motor vehicles, and produces an output torque substantially constant irrespective of the relative position of the rotor and stator of the hydraulic motor.

Abstract: A compressor discharge valve assembly utilizing a cylindrical cavity in which is provided a discharge flow control valve and a valve stop for limiting the opening movement of the valve during operation of the compressor. The discharge valve chamber defines a cylindrical portion into which opens an outlet from the compression chamber. A cylindrical recess is provided in the wall of the discharge valve chamber for receiving a securing portion of the valve stop. The valve stop may further include a spacer for maintaining an arcuate backup portion thereof in inwardly spaced relationship to the valve. The valve is biased to engage the discharge valve chamber wall adjacent the outlet passage. The valve may be defined by a resilient arcuate member secured at one end to the valve stop whereby the valve is cantilevered from the securing means to extend over an arc of approximately 180.degree. to have a distal portion disposed in closing relationship to the outlet passage.

Abstract: A cylindrical shaped tube freely rotatable within a housing provides the pressure chamber for an eccentrically mounted rotary seal vane type pneumatic motor with the drive actuating air moving axially through the pressure chamber.

Abstract: An air motor includes an arrangement such that a part of an exhaust air from a cylinder of the air motor passes through a gear chamber containing a gear mechanism which links a gear fixed to a shaft directly connected to a rotor with a power output shaft and is discharged through a silencer.

Abstract: A rotary internal combustion engine includes a housing having a chamber defined by an inner surface of oval outline in which a plurality of pistons are arranged, each having a wall portion facing the internal surface. The pistons are linked to each other at adjacent ends by combined sealing and linkage means, which are in sealing contact with the respective piston ends and with the internal surface of the housing. A shaft journalled in the housing extends coaxially through the chamber, and motion transmitting means are provided between the shaft and the combined sealing and linkage means rigidly connected at inner portions thereof to the shaft and carrying the combined sealing and linkage means movable towards and away from the shaft axis. The engine includes further means for transmitting radial forces acting on the pistons to the shaft and comprising arm means turnably mounted on the shaft and pivotally connected to the pistons intermediate opposite ends of the latter.

Abstract: A pneumatically operated vane-type motor for driving medical or dental handpieces. A housing forms a rotor chamber in which a rotor is mounted, the rotor having axial slots in which radially moveable vanes are housed. An adjustment ring is positioned between the inner surface of the housing and the outer ends of the vanes, and is moveable to adjust the speed and torque characteristics of the rotor without requiring adjustment in the compressed air supply. To this end, the adjustment ring has a cylindrical outer surface engaging the inner surface of the housing, and a cylindrical inner surface towards which the vanes extend. The axes of the inner and outer surfaces of the adjustment ring are spaced-apart.

Abstract: A drive apparatus incorporating a rotor rotatably received within the hollow interior of a cylindrical box which is in turn rotatably received within a cylindrical chamber defined within a casing. The rotor is eccentrically positioned within the concentric box and chamber with the rotor including a plurality of selectively extensible and retractable segments for selective engagement with the interior of the cylindrical box upon a rotational driving of the rotor in response to the introduction of pressurized fluid.

Abstract: An arrangement for mounting a gear on a drive shaft of a fuel pump includes a longitudinal slot dividing one end portion of the shaft into first and second cantilever sections. Shoulders formed in the slot on the cantilever sections abut a key extending transversly through the slot to protrude from the shaft and the key is received in keyways formed in the gear diametrically of each other and opening into a cylindrical aperture. The latter is sized to receive the inner end portion of the shaft with a press fit with end walls of the keyways abutting the protruding key to locate the shaft axially within the gear. The width of the slot separating the cantilever sections of the shaft is slightly greater than the diameter of the key thereby providing clearance between the key and the cantilever sections to allow deflection of the sections during press-fitting of the shaft in the gear.