초록 ▼

A power working machine has a machine body, trimming blades attached to the machine body and drivable by a drive source, an operating handle rotatably mounted on the machine body, a throttle lever disposed on the operating handle, and a throttle lock lever disposed on the operating handle for disabl

A power working machine has a machine body, trimming blades attached to the machine body and drivable by a drive source, an operating handle rotatably mounted on the machine body, a throttle lever disposed on the operating handle, and a throttle lock lever disposed on the operating handle for disabling pivotal movement of the throttle lever. The operating handle has a lock mechanism for locking the operating handle at a rotational position relative to the machine body, and an operation lever for unlocking the lock mechanism to thereby permit rotational movement of the operating handle and, simultaneously with the unlocking of the lock mechanism, for placing the throttle lock lever in a locking position to disable pivotal movement of the throttle lever. The throttle lock lever has a lock portion for permitting pivotal movement of the throttle lever while simultaneously locking the operation lever of the operating handle.

대표청구항 ▼

What is claimed is: 1. A power working machine comprising: a machine body having a front portion, a rear portion, and a shaft section extending from the rear portion; a drive source mounted substantially centrally on the machine body; trimming blades attached to the front portion of the machine bod

What is claimed is: 1. A power working machine comprising: a machine body having a front portion, a rear portion, and a shaft section extending from the rear portion; a drive source mounted substantially centrally on the machine body; trimming blades attached to the front portion of the machine body and drivable by the drive source; an operating handle rotatably mounted on the shaft section and disposed on the rear portion of the machine body for gripping by a human operator; a throttle lever mounted on the operating handle for pivotal movement between a non-operating position and an operating position for adiusting an output of the drive source; and a throttle lock lever connected to the operating handle for disabling the pivotal movement of the throttle lever in a locking position of the throttle lock lever; wherein the operating handle comprises a handle body having a front end portion connected to the rear portion of the machine body, a lock mechanism connected to the handle body for locking the operating handle at a desired rotational position relative to the machine body, and an operation lever having an operation portion projecting inwardly from a rear end portion of the handle body and operable by the human operator for unlocking the lock mechanism to thereby permit rotational movement of the operating handle and, simultaneously with the unlocking of the lock mechanism, for placing the throttle lock lever in the locking position thereof to disable the pivotal movement of the throttle lever. 2. A power working machine as claimed in claim 1; wherein the shaft section of the machine body has a plurality of locking grooves formed therein; and wherein the lock mechanism has a projection for engaging one of the locking grooves in the shaft section. 3. A power working machine as claimed in claim 1; wherein the lock mechanism and the operation lever are slidable in a frontandrear direction of the operating handle. 4. A power working machine as claimed in claim 3; wherein the lock mechanism and the operation lever are integrated into a single unitary structure. 5. A power working machine as claimed in claim 1; wherein the handle body comprises a pair of handle portions each having guide portions for slidably mounting thereon the lock mechanism and the operation lever. 6. A power working machine comprising: a machine body having a front portion, a rear portion, and a shaft section extending from the rear portion; a drive source mounted substantially centrally on the machine body; trimming blades attached to the front portion of the machine body and drivable by the drive source; an operating handle rotatably mounted on the shaft section and disposed on the rear portion of the machine body for gripping by a human operator; a gripping handle separate and independent from the operating handle and disposed at the front portion of the machine body for gripping by the human operator, the gripping handle being generally in the shape of a closed loop; a throttle lever disposed on a front portion of the operating handle for pivotal movement between a non-operating position and an operating position for adjusting an output of the drive source; and a throttle lock lever disposed on the operating handle for disabling the pivotal movement of the throttle lever in a locking position of the throttle lock lever; wherein the operating handle comprises a lock mechanism for locking the operating handle at a desired rotational position relative to the machine body, and an operation lever disposed at a rear portion of the operating handle for unlocking the lock mechanism to thereby permit rotational movement of the operating handle and, simultaneously with the unlocking of the lock mechanism, for placing the throttle lock lever in the locking position thereof to disable the pivotal movement of the throttle lever. 7. A power working machine comprising: a machine body having a front portion, a rear portion, and a shaft section extending from the rear portion; a drive source mounted substantially centrally on the machine body; trimming blades attached to the front portion of the machine body and drivable by the drive source; an operating handle rotatably mounted on the shaft section and disposed on the rear portion of the machine body for gripping by a human operator; a throttle lever disposed on a front portion of the operating handle for pivotal movement between a nonoperating position and an operating position for adjusting an output of the drive source; and a throttle lock lever disposed on the operating handle for disabling the pivotal movement of the throttle lever in a locking position of the throttle lock lever; wherein the operating handle comprises a lock mechanism for locking the operating handle at a desired rotational position relative to the machine body, and an operation lever disposed at a rear portion of the operating handle for unlocking the lock mechanism to thereby permit rotational movement of the operating handle and, simultaneously with the unlocking of the lock mechanism, for placing the throttle lock lever in the locking position thereof to disable the pivotal movement of the throttle lever; and wherein the throttle lock lever has a lock portion for permitting pivotal movement of the throttle lever while simultaneously locking the operation lever of the operating handle. 8. A power working machine according to claim 7; wherein the operating handle further comprises a handle body having a front end portion connected to the shaft section of the machine body, and a lever unit having the lock mechanism and the operation lever and connected to the handle body and slidable in a front-and-rear direction of the machine body for selectively locking the operating handle by the lock mechanism at a desired rotational position relative to the machine body and unlocking the operating handle by the operation lever to thereby permit rotational movement of the operating handle relative to the machine body. 9. A power working machine according to claim 8; wherein the operation lever has an operation portion projecting inwardly from a rear end portion of the handle body and operable by the human operator, a fitting portion for engagement with the a lock portion of the throttle lock lever, and a stopper portion for stopping movement of the throttle lock lever. 10. A power working machine according to claim 9; wherein the lock mechanism has a projection for engagement with one of a plurality of locking grooves of the shaft section, an arm portion extending from the projection toward the rear portion of the operating handle, a spring holding portion formed in the arm portion, and a spring disposed in the spring holding portion for biasing the lever unit toward the rear direction of the machine body. 11. A power working machine comprising: a machine body having a front portion, a rear portion, and a shaft section extending from the rear portion; a drive source mounted substantially centrally on the machine body; trimming blades attached to a front portion of the machine body and drivable by the drive source; an operating handle rotatably mounted on the shaft section and disposed on the rear portion of the machine body for gripping by a human operator, the operating handle being generally in the shape of a closed loop; and a throttle lever mounted on the operating handle for pivotal movement between a nonoperating position and an operating position for adjusting an output of the drive source; and wherein the operating handle comprises a handle body having a front end portion connected to the rear portion of the machine body, a lock mechanism disposed in the handle body for locking the operating handle at a desired rotational position relative to the machine body, and an operation lever having an operation portion projecting inwardly from a rear end portion of the handle body and operable by the human operator for unlocking the lock mechanism to thereby permit rotational movement of the operating handle and, simultaneously with the unlocking of the lock mechanism, for locking the throttle lever in the non-operating position. 12. A power working machine according to claim 11; wherein the operating handle has a front portion connected to the rear portion of the machine body and a rear portion; and wherein the throttle lever is disposed in the rear portion of the operating handle. 13. A power working machine according to claim 12; further comprising a gripping handle separate and independent from the operating handle and disposed at the front portion of the machine body for gripping by the human operator, the gripping handle being generally in the shape of a closed loop. 14. A power working machine according to claim 11; further comprising a gripping handle separate and independent from the operating handle and disposed at the front portion of the machine body for gripping by the human operator, the gripping handle being generally in the shape of a closed loop. 15. A power working machine according to claim 11; wherein the operating handle further comprises a lever unit having the lock mechanism and the operation lever, the lever unit being connected to the handle body and slidable in a front-and-rear direction of the machine body for selectively locking the operating handle by the lock mechanism at a desired rotational position relative to the machine body and unlocking the operating handle by the operation lever to thereby permit rotational movement of the operating handle relative to the machine body. 16. A power working machine according to claim 15; further comprising a throttle lock lever disposed on the operating handle for disabling the pivotal movement of the throttle lever in a locking position of the throttle lock lever; and wherein the operation lever has a fitting portion for engagement with a lock portion of the throttle lock lever, and a stopper portion for stopping movement of the throttle lock lever. 17. A power working machine according to claim 16; wherein the lock mechanism has a projection for engagement with one of a plurality of locking grooves of the shaft section, an arm portion extending from the projection toward the rear portion of the operating handle, a spring holding portion formed in the arm portion, and a spring disposed in the spring holding portion for biasing the lever unit toward the rear direction of the machine body.