Abstract: A working machine having a working part driven by an engine and a transporting part driven by an electric motor. The rotation of the electric motor is controlled by a control part. The speed of the engine as of when the working part is brought to a working state by a work on/off switch being turned on is taken as a reference speed, and a correction coefficient corresponding to this reference speed is taken as an upper limit value. A correction coefficient corresponding to the present speed of the engine is determined. A required acceleration set in correspondence with the size of the actual travel speed of the transporting part is multiplied by the determined correction coefficient to correct this required acceleration. The control part acceleration controls the rotation of the electric motor in accordance with the corrected required acceleration.

Abstract: A working machine has an engine, a working part driven by motive power from the engine, and a control part for controlling the engine. When operation of the working part has been stopped for a pause in work and the engine is idling, the control part performs control so that the engine automatically stops when a number of conditions are satisfied.

Abstract: A travel control method for an electric vehicle for individually regulating with left and right brakes the speeds of left and right drive wheels driven by left and right electric motors. Brake buttons are used for the brakes. Left and right brake percentages are determined on the basis of ON times of the brake buttons. Motor control values are obtained on the basis of the brake percentages, and the electric motors are controlled in accordance with the motor control values.

Abstract: An electric vehicle includes left and right electric motors for separately driving left and right traveling apparatuses, respectively, and a control unit for controlling the left and right electric motors, separately. When operation of the electric vehicle is switched from a turning mode to a straight-traveling mode if one of the electric motors disposed on the same side as a turning direction of the electric vehicle has a speed not exceeding a predetermined minimum reference speed, the control unit abruptly increases a level of an accelerating control signal for a temporary time from the switching of operation to abruptly accelerate the one electric motor, such that the speed of the one electric motor can be made close to that of the opposite electric motor in a shorter time.

Abstract: A travel control method of an electric vehicle wherein to raise the straight-line driveability of the electric vehicle speed-reduction control is carried out so that the speed of an electric motor rotating at a higher speed is lowered to match the speed of an electric motor at a lower speed. This speed-reduction control is executed when the speed of the motor at the higher speed is above a preset threshold value. The time taken to reach a predetermined threshold value from immediately after starting is short, and the electric vehicle reaches the desired speed rapidly after moving off.

Abstract: An electric vehicle in which left and right electric motors respectively driving left and right transporting parts are controlled by a control part and particular turning control of the electric motors is carried out when the electric vehicle turns. The electric vehicle has a left and right pair of push-button turn switches. When one of the turn switches is operated, the control part selects a pattern from multiple preset deceleration patterns and decelerates the motor on the inside of the turn, which corresponds to the turn switch being operated, on the basis of this deceleration pattern. The electric vehicle makes turns and returns to straight-line travel optimally and smoothly and can be operated easily by an operator with no skill or experience.

Abstract: Working machine is provided which employs both an internal combustion engine and left and right electric motors. The working machine also includes a control unit for controlling rotation of the motors. The control unit shifts the machine to a battery mode so that the electric motors are rotated by only electric power supplied by a battery with the internal combustion engine kept deactivated.

Abstract: In an electric lawn mower, a rechargeable battery and an electric motor activatable by the battery are mounted in a machine body section, and a cutter blade is provided within a cutter housing and rotatable via the electric motor to cut grass. Cover member collectively covers the battery and electric motor. The cover member is shaped to progressively slant upward in a front-to-rear direction of the machine body section, and the cover member has an opening formed in its lower front end portion and an air vent formed in its rear end portion to thereby permit ventilation from the opening to the air vent such that the battery and electric motor can be cooled by air flows.

Abstract: Walk-behind electric working machine includes an operating handle section extending rearwardly from a rear portion of a machine body frame. The operating handle section includes a handle post removably attached to a handle support provided on a rear portion of the machine body frame, and a handle attached to the handle post and having left and right grip portions. The right grip portion includes a work preparing lever, and the left grip portion includes a work starting operation button. Electric motor for driving cultivating claws is activated in response to operation of both the work preparing lever and the work starting operation button.

Abstract: Switch operation mechanism includes a handling lever pivotally connected to a portion of a handle, a generally-fan-shaped actuating member pivotally connected at its pivot portion to the handle in such a manner that the actuating member is pivotable in response to operation, by a human operator, of the handling lever, and a noncontact reed switch for turning on or off a cutter-driving electric motor in accordance with an ON/OFF state of the noncontact reed switch. The ON/OFF state of the noncontact reed switch is determined in accordance with pivoting movement, toward or away from the switch, of the actuating member responsive to the operation of the handling lever. With such arrangements, the switching operations of the operation mechanism can be performed accurately in a stable manner.

Abstract: A snow removal machine propelled by crawler belts trained around drive wheels and driven wheels is provided. The snow removal machine has a scraper confronting the outer periphery of the driven wheel so as to remove snow adhering to and accumulating on the outer periphery during snow removing operation. It prevents increase in tension of the crawler belt due to the increased diameter of the driven wheel in appearance that might otherwise be caused by snow adhering to the outer periphery.

Abstract: Switch operation mechanism includes a handling lever pivotally connected to a portion of a handle, a generally-fan-shaped actuating member pivotally connected at its pivot portion to the handle in such a manner that the actuating member is pivotable in response to operation, by a human operator, of the handling lever, and a noncontact reed switch for turning on or off a cutter-driving electric motor in accordance with an ON/OFF state of the noncontact reed switch. The ON/OFF state of the noncontact reed switch is determined in accordance with pivoting movement, toward or away from the switch, of the actuating member responsive to the operation of the handling lever. With such arrangements, the switching operations of the operation mechanism can be performed accurately in a stable manner.

Abstract: In an electric lawn mower, a rechargeable battery and an electric motor activatable by the battery are mounted in a machine body section, and a cutter blade is provided within a cutter housing and rotatable via the electric motor to cut grass. Cover member collectively covers the battery and electric motor. The cover member is shaped to progressively slant upward in a front-to-rear direction of the machine body section, and the cover member has an opening formed in its lower front end portion and an air vent formed in its rear end portion to thereby permit ventilation from the opening to the air vent such that the battery and electric motor can be cooled by air flows.

Abstract: A snow removing machine has a vehicle body having a body frame, a snow removing section mounted on a front portion of the body frame for removing snow, an operating handle mounted to a rear portion of the body frame and having a first handle portion and a second handle portion, and a pair of grip portions each mounted on a respective one of the first and second handle portions of the operating handle. A forward and aft drive changeover switch is directly mounted on the first handle portion of the operating handle for changing over a traveling direction of the vehicle body. A height control operation lever is directly mounted on the first handle portion of the operating handle for adjusting a height of the snow removing section. A speed control operation lever is directly mounted on the second handle portion of the operating handle for adjusting a traveling speed of the vehicle body.

Abstract: A walking-type snow removal machine comprises a snow removing member provided at a front part of a body frame for pushing snow forward, and crawler belts provided on right and left sides of the body frame. The body frame carries thereon an electric motor and a battery. The electric motor drives right and left drive wheels to drive the crawler belts. The electric motor generates little noise as compared with an engine, and contributes to downsizing of the snow removal machine. The battery supplies electrical power to the electric motor.

Abstract: A snow removal machine propelled by crawler belts trained around drive wheels and driven wheels is provided. The snow removal machine has a scraper confronting the outer periphery of the driven wheel so as to remove snow adhering to and accumulating on the outer periphery during snow removing operation. It prevents increase in tens ion of the crawler belt due to the increased diameter of the driven wheel in appearance that might otherwise be caused by snow adhering to the outer periphery.

Abstract: A snow removing machine comprising a forward and aft drivechangeover switch, a height control operation lever for adjusting the height of a snow removing plate, both mounted to one of grip portions, and a speed control operation lever mounted to the other one of the grip portions. Gripping the grip portions with his respective hands, an operator can manipulate the forward and aft drive changeover switch and the height control operation lever by one of his hands and the speed control operation lever by the other one of his hands, thereby making the operator avoid single hand driving of the machine.

Abstract: A walking-type snow removal machine comprises a snow removing member provided at a front part of a body frame for pushing snow forward, and crawler belts provided on right and left sides of the body frame. The body frame carries thereon an electric motor and a battery. The electric motor drives right and left drive wheels to drive the crawler belts. The electric motor generates little noise as compared with an engine, and contributes to downsizing of the snow removal machine. The battery supplies electrical power to the electric motor.

Abstract: An electric working machine having an electric motor and batteries for providing power to the motor is provided. Power for charging the batteries is provided to the working machine through a connector. A key member is provided which comprises a key body having one end for insertion into and removal from a switch, and an operation portion which is integrally or removably provided at the other end of the key body extending sideways from the key body. The connector is positioned to the side of the switch at a location where it is covered by the operating portion of the key member at a turned position of the key member when the switch is in a first state, such that the connection of the connector with an external power source is made impossible.

Abstract: A battery driven electric lawn mower includes a DC motor, and mowing blade on an output shaft of the motor. A control unit is connected between the motor and the battery for increasing and decreasing the electric current supplied to the motor in accordance with an increase and decrease in load, to thereby maintain the number of revolutions per second of the motor substantially constant at or near a minimum value permitting a mowing blade to function normally under a heavy load. The control unit comprises an electric current detecting device for detecting a load current flowing in the motor, and a pulse generating device for outputting a pulse signal having a pulse width corresponding to an electric current value detected by the electric current detecting device. A pulse-responsive switch device for adjusting the electric current supplied to the motor in response to a pulse signal output from the pulse generating device. The pulse responsive switch device is connected in series with the motor.