Variable pitch power trowel

Details Variable pitch power trowel Variable pitch power trowel

1991-03-22

1992-09-15

Britts, Ramon S.

Road structure, process, or apparatus

Apparatus

With means for profile shaping, e.g., crown

404112, E01C 1922

Patent

active

051471469

ABSTRACT:
A power trowel surface finishing machine comprising a rotatable trowel blade assembly having a plurality of trowel blades disposed on a circumferentially-spaced arrangement, each of the trowel blades being mounted for rotation on radial axes substantially parallel to the surface to be finished, said trowel blades being adapted to rest on the surface to be finished and rotate across the surface; a first adjustment mechanism including a rotary knob for selectively pivoting the trowel blades about the respective radial axes thereof to selectively adjust the pitch of the blades in controlled increments throughout an adjustment range with respect to the surface and maintain the pitch so selected within the adjustment range; and a second adjustment mechanism including a pivotable lever coupled to said first adjustment mechanism for overriding said first adjustment mechanism and rapidly pivoting the trowel blades about the respective radial axes to position the trowel blades from the selected pitch to another selected pitch within the adjustment range in response to manual movement of the second adjustment mechanism by an operator from a rest position, and for rapidly returning the blades to the selected pitch set by the first adjustment mechanism when returned by the operator to the rest position; whereby high or low spots of the surface to be finished can be rapidly removed or filled, respectively, by movement of the second adjustment mechanism.

REFERENCES:
patent: 2621568 (1952-12-01), Fletcher
patent: 2887934 (1959-05-01), Whiteman
patent: 2979996 (1961-04-01), Spitler et al.
patent: 2983203 (1961-05-01), Fletcher
patent: 3412657 (1968-11-01), Colizza et al.
patent: 4320986 (1980-03-01), Morrison
patent: 4673311 (1987-06-01), Whiteman, Jr.
patent: 5096330 (1992-03-01), Artzberger

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