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A rotary power trowel having a safety clutch, a gyroscopic stabilizing ring, blade pitch control, and an adjustable handle. The safety clutch employs a belt tension adjustment to act as a brake on the drive belt when activated either manually or, in an emergency, automatically by a lever on a handle

A rotary power trowel having a safety clutch, a gyroscopic stabilizing ring, blade pitch control, and an adjustable handle. The safety clutch employs a belt tension adjustment to act as a brake on the drive belt when activated either manually or, in an emergency, automatically by a lever on a handle near the operator. When the rotary trowel goes out of control in an emergency, centrifugal force activates the lever and disengages the driving force and acts to brake the belt in less than one turn of the handle. The gyroscopic stabilizer ring lowers the rotary trowel center of gravity and generates a stabilizing effect. Blade tilting is accomplished through a turning knob located at the end of the adjustable handle, which is adjustable to the height of the operator.

대표청구항 ▼

In a rotary powered trowel having prime mover means, a troweling blade assembly, drive means interconnecting the prime mover means and blade assembly to rotate said blade assembly, and handle means connected to said trowel to enable an operator to manipulate and control the trowel, that improvement

In a rotary powered trowel having prime mover means, a troweling blade assembly, drive means interconnecting the prime mover means and blade assembly to rotate said blade assembly, and handle means connected to said trowel to enable an operator to manipulate and control the trowel, that improvement comprising said troweling blade assembly including support means connected with and driven by the drive means, said support means including a plurality of sleeves, a blade support arm mounted in each of the sleeves and projecting outwardly therefrom for angular movement about the longitudinal axis of the blade support arm, a longitudinally elongated blade attached to each blade support arm, and means connected with each blade support arm to tilt the blade support arm and blade to vary the pitch of the blade, said means for tilting the blade including an offset lug attached to each blade supporting arm outwardly of the sleeve, a vertically movable thrust plate disposed above the support sleeves for the blade support arms, connecting rods universally, adjustably and positively connecting the thrust plate and lugs, a thrust bearing engaged with the thrust plate, and means operative from the handle means remote from the prime mover means to apply downward thrust on said thrust bearing, thrust plate and lugs to vary the pitch of the blades about the longitudinal axis of the portion of the blade supporting arms received in the support sleeves, said connecting rods preventing the blade from flopping freely when the trowel is lifted with the blades spaced from the working surface.