Apparatus for finishing concrete
View Patent ↗A power trowel is provided for finishing concrete. The trowel can be used to finish concrete at different stages of hardening. The handle of the trowel is rotated both to adjust the speed of rotation of the trowel blades and the cant of the trowel blades.
1. A power trowel including
(a) a frame including a hub:
(b) a pole having
(i) a distal end shaped to be grasped as a handle,
(ii) a proximate end attached to said frame,
(iii) a longitudinal axis extending from said distal end to said proximate end, said pole rotatable along its entire length about said longitudinal axis:
(c) a plurality of spaced apart blades pivotally mounted on and radially extending from said hub, each of said blades having a lower surface area;
(d) a transmission assembly mounted on said frame and operatively associated with said blades to pivot and alter the cant of said blades, said transmission assembly including a plurality of spherically shaped bearings that are displaced toward and away from said axis of said hub during operation of the transmission to alter the cant of said blades;
(e) a first linkage assembly for activating said transmission assembly to pivot and alter the cant of said blades;
(f) a control assembly interconnecting said proximate end of said pole and said first linkage assembly, said control assembly including a component connected to and extending outwardly from said proximate end of said pole at an angle to said longitudinal axis such that when said handle is rotated in a selected direction, said component is laterally displaced with respect to said longitudinal axis and activates said control assembly to displace said first linkage assembly to activate said transmission assembly and pivot and alter the cant of said blades;
(g) an engine mounted on said frame, having a throttle, and operatively associated with and rotating said hub; and,
(h) a second linkage assembly interconnecting said throttle and said pole and including an end attached to said proximate end of said pole such that when said pole is rotated about said longitudinal axis in a direction opposite said selected direction, said second linkage assembly is laterally displaced with respect to said longitudinal axis to adjust said throttle.
2. The power trowel of claim 1 wherein each of said first linkage assembly and said second linkage assembly is selected from a group consisting of a cable, a chain, a plurality of interconnected rods, and a single rod.