초록 ▼

Improvements are described for power mowers comprising a prime mover, a rotatable drive shaft driven by the prime mover and rotatable grass cutting means adapted to be driven by power from said drife shaft. The improvements involve including in the mowers (a) a centrifugal clutch interposed between

Improvements are described for power mowers comprising a prime mover, a rotatable drive shaft driven by the prime mover and rotatable grass cutting means adapted to be driven by power from said drife shaft. The improvements involve including in the mowers (a) a centrifugal clutch interposed between the drive shaft and the cutting means, (b) apparatus enabling the prime mover to operate at a rate of speed at least high enough for the clutch to engage, and alternatively at a rate of speed low enough for the clutch to disengage, and apparatus including a pulley and at least one stationary belt frictionally engageable therewith for stopping rotation of the cutting means concurrently with the disengagement of the clutch.

대표청구항 ▼

In a power mower operated by an operator who walks behind it, the mower having a wheeled body, a gasoline engine mounted on the body, a rotatable shaft driven by the engine, rotatable grass-cutting means adapted to be driven by power from said shaft, and an upstanding handle for grasping by the oper

In a power mower operated by an operator who walks behind it, the mower having a wheeled body, a gasoline engine mounted on the body, a rotatable shaft driven by the engine, rotatable grass-cutting means adapted to be driven by power from said shaft, and an upstanding handle for grasping by the operator to guide the mowing, the improvement wherein said power mower further includes: (a) a centrifugal cluth interposed between said drive shaft and said cutting means; (b) a manually actuatable engine control associated with said handle and connected so that upon and during actuation the control enables the engine to be operated at a predetermined rate of speed at least high enough for the centrifugal clutch to engage, and upon termination of such actuation of the control, it causes the engine to operate at a predetermined rate of speed at least low enough for the centrifugal clutch to disengage; and (c) brake means including a V-groove drum that rotates with the grass-cutting means, as well as a V-belt sized to fit the V-groove but fixed so that it cannot rotate with the groove, said brake means being connected to the control and to the grass-cutting means to stop rotation of said cutting means concurrently with the disengagement of the centrifugal clutch when the control is not actuated, the engine control including a governor system comprising a pivotable governor arm linked to a carburetor throttle control and to a spring that urges said arm toward a position wherein the carburetor throttle control is at a setting causing the engine to operate in a preselected normal clutch-engaging operating speed range, and the engine control further including a push-pull actuator cable moveable in response to manual actuation and termination of manual actuation of said control by the operator, and a pivotal lever linked to said push-pull actuator cable and positioned so that (i) upon manual actuation of said engine control by the operator said cable causes said lever to release from said arm so that the force of said spring moves said arm to a position wherein the carburetor speed control is at a setting causing the engine to operate in a preselected normal operating speed range, and (ii) upon termination of manual actuation of said engine control by the operator said actuator cable causes said lever to apply a force upon said arm overriding the force of said spring and to force said arm against the urging of said spring to a position wherein it holds the carburetor speed control at a setting causing the engine to operate in a preselected low speed or idle range.