Abstract: An operation mode switching mechanism for use with a power tool disclosed in the present invention includes a torsion unit, a switching unit, a clutch member, a power output member and an output shaft, where the switching unit can be switched between three rotating positions and one impact position. When the switching unit is at one of the rotating positions (screw symbols), the output shaft is driven to rotate by a carrier plate; and when switching unit is switched to the impact position (impact symbol), the output shaft is pushed by the clutch member so as to disengage from the carrier plate and is driven by a planet plate. The clutch member also restricts the direction of motion of the output shaft in the impact position, so the output shaft moves back and forward to generate reciprocating impact output.

Abstract: A power transmission device that can reliably prevent engine stall from occurring. The power transmission device includes a transmission clutch 3 interposed between an engine E and a transmission T/M, and control 22 for controlling connection and disconnection of the transmission clutch 3. The power transmission device also includes first engine stall risk determination 22 for determining based on an engine operation state whether there is an engine stall risk when the transmission clutch 3 is connected. The control 22 disconnects the transmission clutch 3 and controls the engine E to a predetermined rotation speed for a predetermined time when the determination by the first engine stall risk determination 22 is affirmed.

Abstract: A hybrid vehicle control system for cutting off fuel to an internal combustion engine of hybrid vehicle while providing smooth transitions from a hybrid drive mode to an electric drive mode is provided. The hybrid vehicle control system includes an integrated controller configured to receive inputs corresponding to vehicle speed and an indicated driving force, and to select an appropriate mode transition pattern from a group of mode transition patters according to the change in indicated driving force.

Abstract: A method for monitoring a chain pulley block and a chain pulley block apparatus with an electric actuator motor (2) that is connected at the drive side to a transmission (7) across a sliding clutch (14). In order to achieve a safe operation of the chain pulley block, the speed of the transmission (7) is determined via a sensor (18), the determined speed of the transmission (7) is compared in a control device (19) to the operating speed of the actuator motor (2) as determined from rated duty of the actuator motor (2) and if a deviation is found between the speed of the transmission (7) and the operating speed, allowing for tolerances and any transmission ratio of the transmission (7), the actuator motor (2) is switched off.

Abstract: An overload prevention device has a first rotational member for driving engagement with an input shaft of an auger transmission of a snow removing machine, a second rotational member engaging the first rotational member for rotation therewith over a predetermined torque range and for rotation relative thereto when a predetermined torque is exceeded, and a movable member mounted adjacent to the first rotational member for undergoing movement to restrict a rotating angle of the second rotational member. A detector outputs a detection signal each time the detector detects movement of the movable member in a direction away from the first rotational member when protuberances of the movable member engage protrusions of the first rotational member responsive to relative rotation between the first and second rotational members. A control unit stops operation of the engine when the detector outputs the detection signal a preselected number of times within a preselected time period.

Abstract: An overload prevention device of a snow-removing machine which can distinguish between momentary overloading occurring when an auger has hit a curbstone or the like and continuous overloading caused by the auger biting into snow or debris. When overloading arises in the auger, a slide washer provided adjacent to a side face of a worm wheel moving away from the side face is detected by a washer detector switch. When a detection signal from this detector reaches a predetermined number of times within a predetermined period, a control unit controls an engine to stop.

Abstract: An overload protecting device assembled in an auger transmission is disclosed as including a worm wheel having its side wall formed with a plurality of wheel-side protruding segments, a boss member engaging with the wheel and fixedly coupled to an auger shaft for non-rotating relationship, and a slide washer having a plurality of wheel-side projections facing the wheel-side protruding segments. When the auger shaft encounters a torque exceeding a given value, the worm wheel and the boss member are enabled to rotate relative to one another. As the wheel-side projections ride on the protruding segments, the slide washer is moved in a direction opposed to the worm wheel. A washer detection switch detects such a movement to produce a detection signal to forcibly stop the operation of an engine.

Abstract: An apparatus for protecting an automatic clutch from overheating, capable of holding down the generation of heat in the clutch even when the condition in which a traveling load at a vehicle starting time exceeds a predetermined level continues for a predetermined period of time. The automatic clutch is provided in a transmission path extending between an internal combustion engine and a transmission adapted to change a speed represented by an output from the internal combustion engine.

Abstract: A drive system for a boat having a hull with an inboard motor and two spaced drive units mounted in the hull, including a dual drive package having a housing with first and second output shafts mounted in bearings in the housing and an input shaft mounted in bearings in the housing between the output shafts, first and second drive chain sprockets mounted on and spaced axially along the input shaft, a third drive chain sprocket mounted on the first output shaft, a fourth drive chain sprocket mounted on the second output shaft, a first drive chain coupling the first and third sprockets, a second drive chain coupling the second and fourth sprockets, and arrangements for connecting the input shaft to the motor and each of the output shafts to a respective drive unit. The drive system may further include first and second torque limiters for connecting between the respective drive units.

Abstract: A torque responsive release clutch mechanism for a pneumatic power nutrunner having a housing (16) with an air inlet passage (11) and an air motor (12). The clutch mechanism includes a driving clutch half (22) with pockets (33) for two or more torque transferring balls (24), a bias spring (38), and an axially displaceable thrust element (34) for transferring the bias spring load to the balls (24), and a driven clutch half (23) having cam surfaces (25) for cooperation with the balls (24), wherein the driving clutch half (22) includes means (36, 44, 45) for feeding pressure air to the cylinder chamber (30), and the thrust element (34) has a cylindrical skirt portion (43) for sealing guidance in the cylinder chamber (30). A valve (44, 45, 48, 49) is arranged to accomplish a bias spring (38) compressing air force on the thrust element (34) as the latter has been initially displaced a certain distance by the balls (24) at release of the clutch.

Abstract: In a torque limiter, a ball pressing mechanism is provided to press a ball by a spring into a round hole having a smaller diameter than the ball formed at the end surface of an input member of the torque limiter main body. Accordingly, it is designed to actuate accurately when the load torque exceeds a specific value. Furthermore, the constitution includes rotation limiting means for limiting the relative rotational angle of the input member and output member within a specific angle after the torque limiter main body is put in action, and positioning mechanism for positioning the output member in cooperation with the action of the torque limiter. Hence, the output member can be positioned accurately.

Abstract: A clutch torque control features a plurality of clutch balls disposed between complementary races of input and output cams which are relatively axially displaceable upon the input cam rolling the clutch balls between matching cam peaks responsive to a drive output reaching a predetermined output torque.

Abstract: Transmission between electric motor and tool shaft, for instance for hand tools such as an electric screwdriver and the like, which transmission is provided with an adjustable breaking coupling for discontinuing the drive torque on the tool shaft when a predetermined resistance moment on this tool shaft is exceeded, wherein the breaking coupling in the form of two mutually slidable parts is provided with a signal generator for controlling a member influencing the motor feed, which signal generator comes into operation as soon as the two parts slide relative to one another when the set torque is exceeded, so that a disengagement takes place between motor and tool shaft immediately after the desired resistance moment is exceeded, wherein the inertia of the rotating parts no longer has any effect on the tool shaft so that it stops immediately.