Abstract: A power transmission system includes a motor connected to a variable pulley device via a uni-directional device and an engine connected to a clutch device via a uni-directional device. A pulley device is disengagably connected to the clutch device and connected to the variable pulley device by a belt. A pulley device is connected to the variable pulley device by another belt and the pulley device is connected to a gear box. The variable pulley device includes two disks and a threaded axle connected therebetween. A movable member having two inclined surfaces is movably mounted to the threaded axle so that the two belts are separated by the movable member.

Abstract: An electromechanical actuator is disclosed having either a rotary output or a linear output for moving an external load, the actuator having at least two drive motors, a synchronizer connected to the outputs of the drive motors, a differential mechanism combining the outputs of the drive motors, and a quick release mechanism connected to the differential mechanism and the actuator output, the quick release mechanism releasing support of the external actuator load in response to an internal actuator jam and maintaining support or the external actuator load in response to an external actuator overload.

Abstract: A phasing differential gear assembly is arranged in a housing, for the speed adjustment of an output shaft which shaft may be utilized to control tension in a web on a drum being driven by the output shaft. A driven input shaft having a second end imparts a first rotational speed to a co-axially arranged first end of the output shaft. A first external toothed gear is arranged on the first end of the input shaft, and a second external gear is disposed between the second end of the input shaft and the first end of the output shaft. A third external toothed gear is disposed on the first end of the output shaft. A first flexible gear is arranged radially outwardly of the first and second external gears, and a second flexible gear is arranged radially outwardly of the second and third external gears. A first wave generator is arranged radially outwardly of the first flexible gear, and a second wave generator is arranged radially outwardly of the second flexible gear.

Abstract: A twin-clutch transmission having the driving gear wheels of adjacent gears on different transmission input shafts permits skipping one gear stage while shifting gears, i.e. shifting between gears whose driving gear wheels are on the same transmission input shaft, by using an auxiliary gear on the other transmission input shaft to supply a filler torque while shifting between the initial gear and a selected gear.

Abstract: A multi-functional apparatus employs a power transmission mechanism for generating intermittent motion having a specific range of motion and angular velocity profile for selectively actuating a mechanical device operably coupled to the power transmission mechanism. An electromagnetic device selectively causes movement of the power transmission mechanism. In another aspect of the present invention, a single electric motor selectively actuates a plurality of intermittent rotary motion mechanisms thereby causing separate mechanical devices coupled thereto to operate within an automotive vehicle.

Abstract: A ram driving device for a press machine having: a ram; a horizontal drive axle (33) rotatably provided horizontally in a frame (3) of the press machine; a motion converting mechanism (35, 63, 83) associated with the horizontal drive axle, for converting a rotational motion of the horizontal drive axle into up-and-down motion of the ram (29); and a plurality of servomotors (43, 47) linked with the horizontal drive axle, for rotating the horizontal drive axle in synchronism with each other, to drive the ram up and down. The motion converting mechanism is a connecting rod (35); and a link mechanism (63) driven by a ball screw (61) and a nut member (77); and an eccentric ring cam (33) and a cam follower (91). Since the ram can be driven by a plurality of the servomotors synchronously, the device can generate a large press power of various moving stroke and various moving speed freely, without increasing the maintenance cost thereof.

Abstract: A vehicle transmission comprising:a first input for connection to a prime mover of the vehicle;an output for connection to ground-engaging wheels of the vehicle;multi-ratio transmission means operable to provide a driving connection, at a selected one of a number of gear ratios, between said first input and said output;a further input for connection to the prime mover of the vehicle;means operable to provide a driving connection between said further input and said output via at least part of said multi-ratio transmission means.

Abstract: A shaft assist electric power steering apparatus including an electric motor and a speed reducer having an input planetary gear set and an output planetary gear set each concentric with a steering shaft. The input planetary gear set includes an input ring gear, an input sun gear, a stationary input planet carrier, and a plurality of input planet pinions one of which is driven by the electric motor. The output planetary gear set includes an output sun gear rigidly connected to the input sun gear, an output ring gear rigidly connected to the input ring gear, an output planet carrier rigidly connected to the steering shaft, and a plurality of output planet pinions. The driven input planet pinion rotates the input sun gear and the input ring gear in opposite directions and, likewise, the output sun gear and the output ring gear.

Abstract: A handle apparatus has a rough movement handle and a fine movement handle for rotating an output shaft at leastwise two stages of rough and fine movements by rotationally operating these handles. The rough movement handle is constructed as a crank handle. The fine movement handle is provided in a position apart from a rotating center of the crank handle. A medium movement handle may be provided coaxially with the fine movement handle. It is therefore possible to provide the inexpensive handle apparatus capable of increasing a driving torque of the rough movement handle, shifting the fine movement handle to an arbitrary position, making an installation thereof easier and reducing the number of parts required.

Abstract: A motor drive system is provided with two drive units so that the system may be driven not only by operating one of the drive units but by simultaneously operating both of the drive units in accordance with load condition. Both of the first and second drive units are provided with a motor and a gear reduction mechanism. The output gear of the second drive unit is mounted as a planetary gear of a planetary gear mechanism on the carrier. When the current is supplied simultaneously to both the motor of the first drive unit and to the motor of the second drive unit, the output gear of the first drive unit comes into mesh with the output gear of the second drive unit, combining the output forces of the first and second drive units to drive the load driving shaft.

Abstract: An improved harvesting cart having a drive assembly for providing easy transition between PTO drive and hydraulic drive is disclosed. The harvesting cart has a drive shaft for engaging an auger flighting or other unloading mechanism. A forward end of the drive shaft is adapted to receive a complementary PTO coupling from a pulling vehicle.

Abstract: An electro-mechanical actuator has two motors which normally operate at the same speed and combine (sum) to move a load via a rotary actuator output member. If the motors begin to operate at different speeds, this indicates that the system has failed, and the output member is automatically decoupled from the remainder of the actuator. This leaves the output member free to rotate relative to the remainder of the actuator. The speeds of the motors are monitored by a differential mechanism which produces a rotary output proportional to the average of the two motor speeds. This average is normally the same as the speed of the output member. Decoupling of the output member occurs when this average deviates from the output member speed.

Abstract: A switch machine for railroad tracks is provided having a low vertical profile without increasing the axial length of existing switch machines. Also, the capability of being operated by an electric motor, hand crank or hand throw operation has been retained within these new dimensional constraints. A particular electric motor and gearbox combination permits a low overall profile due to its compact size. A worm gear shaft serves the dual purpose of driving a worm wheel and coupling to a hand crank, thus maintaining the low profile while increasing the functionality of the shaft. In addition, a hand throw drive shaft is provided adjacent to a crank drive shaft in order to provide a hand throw operation while further maintaining the low profile of the switch machine.

Abstract: A two degree-of-freedom robot manipulator is constructed from two rotary drives of prior invention. Each rotary drive consists of a relatively small diameter cylindrical driving member and a relatively larvae diameter cylindrical driven member coupled by a cable system. The driving member of rotary drive 2 is positioned with its axis of rotation coincident with the axis of rotation of the driven member of rotary drive 1. The driven member of drive 2 is rotatably mounted to the driven member of drive 1 to realize the required relative positioning of the driving and driven members of drive 2. The driving members of both rotary drives are mounted in a fixed reference frame. Coordinated control of the driving members allows two axis dynamic control of a tool apparatus mounted to the second driven member.

Abstract: The invention relates to a hydrostatic drive, preferably for an earth-moving vehicle, such as a wheel loader, comprising two reciprocating-piston rotary motors of the inclined-axis or inclined-disk type. The reciprocating-piston rotary motors have an angle of inclination which are adapted to be controlled to decrease toward zero as the torque decreases and the velocity increases, and which each is coupled to an input shaft of a shiftable transmission. The shiftable transmission comprises two input shafts, which are coupled to two reciprocating-piston rotary motors, and each input shaft is adapted to be coupled to a common output shaft by means of one of at least two shiftable gear stages.

Abstract: The present invention relates to a three-shaft gearbox particularly for industrial vehicles in general, which comprises an input shaft which is associable with a power unit and selectively interacts with a first countershaft or with a second countershaft. The first countershaft rigidly rotationally supports odd-numbered speed gears, whereas the second countershaft rigidly rotationally supports even-numbered speed gears. The first countershaft and the second countershaft are mutually disconnected. The even-numbered speed gears and the odd-numbered speed gears mesh with respective output gears, which are supported by an output shaft and can be selectively rigidly rotationally associated with the output shaft.

Abstract: To ensure the power transmission between a driving shaft (42) and two assemblies to be driven, such as the rotor or rotors and the ancillary systems of a gyroplane, a mechanism is proposed, which has a connection shaft (48) constantly engaged on the driving shaft and on device (54) for riving the ancillary systems. An actuator (80) controls a translation of the connection shaft between a first position in which a free wheel (44), interposed between the driving shaft (42) and a device (46) for driving the rotor or rotors, occupies a rotation engagement state and a second position, in which the free wheel occupies a rotation disengagement state. This particularly simple mechanism can be switched from one state to the other, even during the rotation of the driving shaft.

Abstract: A device for the rapid precision positioning of a heavy carriage employs stationary positioning bar, for instance a part of a linear electric motor or a gear rack, and a cooperating moving part of the linear motor or a motor attached to the carriage. The carriage is rapidly and roughly displaced with a further drive which may be constituted by a further gear wheel that cooperates with a gear rack and is driven by a separate motor attached to the carriage. This further drive additionally delivers a certain force for the final positioning in such a way that the play between the gear wheel and the gear rack is eliminated by biasing. Instead of a second gear wheel together with its motor a toothed belt, also driven by a separate motor, a pneumatic cylinder or a linear motor may be used. These are mounted separately from the carriage and ar principally fixed in space.

Abstract: A two speed press drive using hydraulic actuated oil shear clutch/brake units is disclosed. The clutch/brake units for selecting high or low speed are in coaxial nested relationship to each other. The speed change is achieved using a planetary gear set in which all members of the planetary gear set are allowed to float thus providing exact tooth meshing for all components. The drive provides a more precise operation due to no wear of clutch plates and less heat generation in the clutch/brake units. The gearing and bearings for the unit are contained in a sealed chamber which is continuously supplied with oil which has been filtered and cooled.

Abstract: A transmission gearbox noise control system is operative during normal operations of a transmission system to effectively null temperature variations among selected localized areas of the transmission gearbox housing by utilizing oil jets for cooling/heating thereof, thereby reducing or eliminating differential thermal expansion effects or minor manufacturing errors among such localized areas wherein transmission vibration levels (noise) emanating from the gearbox are abated. The system includes one or more metering valves, a spray rod mounted in combination with each metering valve, an oil reservoir, a fluid pathway for fluidically interconnecting each metering valve to the oil reservoir, at least one pump for circulating oil through the fluid pathway, and a regulating subsystem that is automatically or manually operative to initiate/terminate the operation of each metering valve, to regulate the rate of fluid flow therethrough, and/or to adjust the impingement pattern of the fluid jet discharged therefrom.

Abstract: A gear arrangement for an offset transmission includes two concentric, counter-rotating face gears in meshing engagement with an engine output shaft, the face gears being connected to respective concentric, vertical counter rotating face gear shafts of unequal length, each shaft ending in a helical spur gear that is in meshing engagement with an output helical face gear. The helical output face gear is connected to the output shaft, thereby completing the offset transmission. The face gear shafts can be coupled together by means of thrust bearings that couple the axial thrusts of one shaft to the other in an opposite direction. The shafts can also be coupled via a preload spring that ensures the torque split between the pinion gears is statically determinant. The gear arrangement can be applied to twin engine designs, with a spur gear train coupling the two engines together via an interconnect shaft.

Abstract: This invention relates generally to robots and specifically to a robot for spraying applications which has the ability to accurately follow trajectories that require high speeds and accelerations, a working envelope appropriate for processing the sides, top, and bottom of a large object such as an aircraft, an integrated revolute joint and actuator for supplying power to the movable components of the robot along protected, low maintenance power paths, a zero backlash drive, and a gravity compensating system which causes the robot to be neutrally balanced throughout its entire working envelope even while carrying a payload of significant weight.

Abstract: An auxiliary driving device being attached to a primary driving device of a rolling door and including a gear engaged with a gear wheel of the primary driving device, a motor having an axle, a lower disc with a pinion slidably engaged on the axle, a spring biasing the pinion and the lower disc upward, an upper disc disposed above the lower disc, three balls engaged in the recesses formed in the discs, the pinion moves downward to engage with the gear when the first motor is energized so that the spindle can be driven to rotate by the motor.

Abstract: A gear arrangement includes a horizontally inclined rotary shaft having a pinion and two face gears rotating in parallel but axially spaced planes. The two face gears are in meshing engagement with the pinion. Each face gear rotates about a shaft that includes a spur gear. A combining gear is in meshing engagement with both spur gears. Torque from the rotary shaft is equally split between the two face gears, reducing the amount of torque each face gear must transmit. The torque is combined from the two face gears by the combining gear, where the torque may then be used to drive the desired mechanism.

Abstract: A coaxial fine and coarse adjusting device for moving a movable member movably supported on a device body includes a coarse adjustment handle, a fine adjustment handle provided coaxially with respect to the coarse adjustment handle, a bearing member fixed to the device body, a rotation transmission shaft rotatingly supported in the bearing member, the rotation transmission shaft having a pinion for the movement of the movable member, a hollow cylindrical coarse adjustment shaft which passes through the rotation transmission shaft and is rotatably supported by the rotation transmission shaft and the bearing member, a rotatable fine adjustment shaft which passes through the coarse adjustment shaft, a reduction gear train provided between the rotation transmission shaft and the fine adjustment shaft, a first retaining member provided on one end of the coarse adjustment shaft for retaining the reduction gear train in such a manner that it can turn around about its own axis and rotate about the coarse adjustment s

Abstract: This invention is an articulatable mechanism applicable to a wide variety of situations. The device provides a rotational component as well as a pivotal component providing practical propulsion in polar coordinates instead of customary linear transmission. This device could be used for steering propulsion devices by controlling the orientation and direction of a propeller shaft or rocket exhaust. Another application of this device might be orienting and directing devices such as fire hoses and lasers.

Abstract: A twin engine helicopter has an accessory drive system that will operate with only one engine while the other engine is off. The system also allows starting of the second engine without turning the first engine off. An input clutch for the first engine will rotate an inner drive member when it is being driven by the first engine. An accessory drive member mounts to the inner drive member. A collector gear mounts in engagement with the blade drive train and has a drive member. A movable clutch shaft has one end that engages the inner drive member of the input clutch and another end which will engage the drive member of the collector gear. An actuator will move the clutch shaft out of engagement with the drive member of the collector gear to disengage the drive engine from the blade drive train. A synchronizing clutch mounts in engagement with the clutch shaft for causing the clutch shaft to rotate with the collector gear if the second engine is started and operated at a speed faster than the first engine.

Abstract: A compact power unit for an internal combustion engine including a bearing arrangement for the crankshaft which includes a combined crankcase member and bearing cap that has integral bearing journals for the crankcase and which also forms at least in part the crankcase closure. An output shaft for powering a vehicle is also journaled by the cylinder block and crankcase member and is driven by an integral gear formed on one of the throws of the crankshaft. A balancing arrangement for accommodating this non balanced throw and for maintaining equal cylinder bore spacing is also employed.

Abstract: The differential comprises a drive input element, two output cam members each rotatable about a common axis, each cam member having a single angular cam surface thereon of undulating form arranged such that the cam surfaces on the cam members converge towards each other and a plurality of cam followers. The followers have cam engaging end surfaces for imparting drive from the input element to the output cam members. Relative contro-rotation of the output cam members causes the cam followers to slide axially. The cam followers are elongate in direction of the common axis and are slidably supported throughout virtually their entire length by the drive input element. The followers may be arranged closely adjacent each other to provide a degree of mutual support.

Abstract: A drilling machine for drilling large drill holes in rock, especially underground, comprises a support, a rotary drilling drive longitudinally displaceable on the support in a drilling direction and provided with a reducing transmission and drive motors. The reducing transmission including a planetary transmission which is transmissively and selectively connectable with two of the drive motors as a superposed transmission.

Abstract: A stepless drive for vehicles, such as agricultural tractors, which must have a wide range of very low speeds is provided by a hydraulic drive which is selectively engageable in place of the conventional gearbox drive. The hydraulic drive shaft is selectively engageable with the drive shaft of the motor vehicle via a gear shift mechanism in an auxiliary gearbox. An electronic interlock assures that the hydraulic drive is engaged with the drive shaft only when the conventional gearbox drive is disengaged from the drive line, and vice versa.

Abstract: A chip slicer for slicing wood chips such as for use in a pulp preparation procedure with an annular housing having knives therein and a rotor therein with anvil means for carrying wood chips against the knives with a shaft extending coaxially for diving the rotor, a driving hub mounted on the shaft and connected to it, a driven hub rotatably mounted by bearings on the driving hub with each of the hubs having annular plates and shear pins extending axially between the plates of a strength to transmit normal rotational power and to shear upon forced stalling of the rotor with the driven hub permitting continued rotation of the driving hub within the driven hub and continued rotation of the shaft with forced stalling of the rotor.

Abstract: A torque support for drives riding on trunnions, in particular for converter tilt drives, including a gear housing mounted on the trunnion which is rotatable about an axis of rotation, a drive motor attached by a flange or bolting to a step-down gearing which engages, via pinion, with a larger gear wheel fixed for rotation on the trunnion. The torque support includes a pair of guide rods located symmetrically to the axis of rotation of the trunnion, each guide rod includes a first and second oppositely positioned part, the first and second rod part have an upper and lower end and a respective free end opposite thereto; the upper ends are pivotally mounted on the gear housing and the lower ends are connected to each other via either a compression-tension bar or torsion shaft, upon which the lower ends are pivotally mounted.

Abstract: A cogwheel drive mechanism for driving at least one aircraft propeller or helicopter rotor through two transmissions, with two axially displaced transmission-connection shafts and at least one output shaft in the form of a propeller shaft or rotor shaft. The object is to ensure that at least one driven section will remain fully functional between one of the transmissions and one propeller or the other during any conceivable type of malfunction. There are two spatially separated individual drive mechanisms, each of which is accommodated in a separated housing that accommodates sections of one or both of the output shafts and each of which has one of the two connecting shafts.

Abstract: A haymaking machine provided with at least one rotor (5) driven in rotation has a drive housing (12) equipped with two gears which mesh with one another and have different diameters and different numbers of teeth. Each of the gears is connected to a shaft extending out of housing (12) and is able to be driven from power takeoff shaft (11) of the tractor. A third gear is provided with a driven shaft (23) and is able to be connected to rotor (5). The third gear able to be meshed with one or the other of the two above-mentioned gears.

Abstract: A mining apparatus for the mechanized breaking-down of mineral raw materials, particularly coal, in underground mining operation includes at least one endless chain and chain wheels for the endless chain. A main drived is provided for one of the chain wheels and an auxiliary drive is provided for the other chain wheel. The main drive and the auxiliary drive each has a transmission unit including main transmission stage, initial transmission stage, coupling and drive motor. A superposed motor in the form of a controllable electric motor having small power acts in connection with a worm gear transmission on the superposed input of the superposed transmission unit. Synchronous running of the main drive and the auxiliary drive or the drive motors thereof is achieved by a unilateral drive control. This results in a uniform power and load input independently of the wear of the chain and chain wheels.

Abstract: Disclosed is a relative rotation transmitting apparatus comprising outer and inner coaxial shafts, main and sub drives, speed-reduction unit operatively connected both to the telescoped shafts and the main and sub drives with associated gear wheels, and a tool-carrier fixed to the fore-end of the outer shaft and having means for converting the rotation of the inner shaft about the longitudinal axis to the rotation about an axis perpendicular to the longitudinal axis and means for converting the rotation about the perpendicular axis to the linear feeding of a tool along the perpendicular axis, thereby permitting the tool to rotate and move radially.

Abstract: A mechanical actuator assembly which automatically releases the load controlled by the actuator when the actuator jams or otherwise fails. The actuator assembly has two kinetic energy sources, the outputs of which are normally summed for application to the load. A monitoring device monitors the two kinetic energy outputs. When the relationship between those outputs deviates substantially from a predetermined relationship, the load is disconnected from the actuator assembly.

Abstract: Motors (42,44) each have a pinion driving ring gear (62). Motor (42) is mounted on the platform and motor (44) is mounted on ring gear carrier (56). Rotation of either motor rotates carrier (56), hubs (40) and shaft (30).

Abstract: A dual engine drive system for a single propeller shaft includes a single torque-combining gearbox separated from the engines by gearbox input shafts. The engines, gearbox and propeller shaft are mounted as a unit on a common support frame adapted for installation in existing fixed-wing, single-engine aircraft. Each input shaft drives its own primary gear train within the gearbox. Each gear train includes its own output gear coupled to the propeller shaft through an overrunning clutch. An auxiliary drive train driven by the propeller shaft drives redundant propeller governors, an overspeed governor, and an oil pump for lubricating the propeller shaft and auxiliary gear train. The primary gear trains also drive oil pumps for lubricating their own gearbox sections. The three oil pumps are in separate subcircuits of a common oil circuit, and a mechanism is provided for enabling an operating oil pump of one subcircuit to supply oil to another subcircuit if the oil pump in such other circuit fails.

Abstract: Rotary drive apparatus includes a plurality of driving elements connected by a cable to a single driven element, with the multiple drive elements spaced apart about the periphery of the driven elements for imparting rotary motion to the driven element in response to rotation of the driving elements.

Abstract: A valve operator powered selectively either by an electric motor or by a manually operable handwheel, the driving connections from both the motor and the handwheel to the valve including one or more planetary gear sets each having a central pinion rotatable by the motor, a ring gear surrounding the pinion, and planet gears interposed between and meshed with the pinion and the ring gear, the planet gears being rotatable about their own axes and mounted eccentrically on a spider member rotatable about the gear axis, the spider member being operable by its rotation to transmit operating power to the valve being controlled. The ring gears of all of the gear sets are fixed in a rotatable gear case which is turned by the handwheel. A pair of non-reversing torque control devices, disposed respectively between the gear set and the motor, and between the gear set and the handwheel, prevent rotation of the motor by operation of the handwheel, and rotation of the handwheel by operation of the motor.

Abstract: A versatile transmission, particularly a test stand transmission, in which internally and/or externally toothed conversion elements can be inserted from the outside to transmit torque from gears driven by one or more input shafts to one or more output shafts.

Abstract: A steering apparatus for steering propulsion devices such as a propeller shaft and rocket exhaust and for aiming devices such a fire hoses and lasers. The steering apparatus provides a rotational component and a tilting component to the orientation of the steered device.

Abstract: A multi-articulated robot is disclosed which comprises a base; a first arm rotatably supported to said base; a second arm rotatably supported at a forward end of the first arm; a work shaft provided at a forward end of the second arm; belts provided below the first arm and the second arm, respectively; a motor provided at the base for driving the work shaft; a hollow shaft fixed to the base, the hollow shaft rotatably supporting the first arm, and the motor being fixed to the hollow shaft; a rotary shaft rotatably supported in opposition to an output shaft of the motor, the rotary shaft projecting into a space defined below the hollow shaft; a declerator interposed between the rotary shaft and the output shaft of the motor and a pulley provided at a projecting end of the rotary shaft, one of the belts being laid around the pulley. The belt laid around the pulley is of the endless type.

Abstract: In an actuation system having a pair of motors simultaneously operable for driving a movable member through a torque-summing gear box, there is a need to have a simply constructed, minimal cost, light weight quick disconnect mechanism operable to disconnect a motor which has failed fixed so that the other motor can continue to operate. The quick disconnect mechanism utilizes a tapered jaw clutch connecting driving and driven elements in the drive train between the motor and the torque-summing gear box, a ball detent mechanism for holding the clutch either engaged or disengaged and a short duty cycle solenoid. The solenoid can be momentarily energized to release the ball detent mechanism to permit an axial force derived from the driven member being back driven to separate the clutch and thereafter, the solenoid is de-energized to enable the ball detent mechanism to maintain the clutch disengaged.

Abstract: A compliant gear which includes an inner hub portion, an outer ring gear portion, and a compliant laminate between the hub portion and the ring gear portion. The laminate includes a rigid laminar shim of generally uniform thickness sandwiched between a pair of elastomer layers of generally uniform thickness. The laminar shim and the elastomer layers extend generally parallel to the axis of rotation of the gear.

Abstract: An infinitely variable transmission requiring no external controls is shown in its preferred embodiment of the present invention as including a power housing rotatably mounted on an input and an output shaft. The output shaft includes a planetary cage and planetary gears located in the interior of the power housing. The planetary gears are in gearing relation with a sun gear located on the input shaft in the interior of the power housing and also in gearing relation with a ring gear formed as part of the power housing. Lubricant is provided in the interior of the power housing. If the load is sufficient to cause slippage, the resistance of the load coupled to the input rotation causes the power housing to rotate in a direction opposite to the direction of the input and output shafts when the output is initially accelerated.

Abstract: In a microscope, a nosepiece support assembly and a coarse and fine adjustment mechanism in direct operative control of the support assembly, the support assembly including a nosepiece mounting carriage with a depending rod rigid therewith and mounting a cam follower which rides on the edge of a cam, rotation of which is controlled by the adjustment mechanism. The adjustment mechanism in turn includes a reduction gear assembly utilizing dual gear trains and mounted to a cam-mounting shaft externally of the frame of the microscope and housed within a coarse adjustment handwheel for immediate access thereto. One of the gear trains incorporates a compound gear having a torsion spring between the individual gears to enhance gear train interengagement throughout the gear assembly.

Abstract: High-low speed drive system includes a main drive shaft which may be selectively driven off one or the other of a pair of continuously driven high and low speed shafts by selective engagement and disengagement of associated pneumatic operated disc clutches. Such clutches have fast response times, and the clutch associated with the low speed shaft acts as a brake when engaged to rapidly decelerate the main drive shaft down to the speed of the low speed shaft. The timing of both the high speed and low speed pneumatic operated disc clutches are closely controlled so that the low speed clutch is engaged practically instantaneously with the disengagement of the high speed clutch. The clutches are located in substantial radial alignment with each other in close proximity to the gear train between the high and low speed shafts and main drive shaft within the main housing for ease of maintenance and simplified porting of fluid through lines on the same path to all of the clutches.