Patent ID: 11891821
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 23:
24. An improved concrete trowel device attached to a hand-operated power tool, the improved concrete trowel device comprising:
a rotary disk having a top surface and a bottom surface with a plurality of spaced apart screw holes extending there through;
a plurality of flexible replacement blades attached to the bottom surface of the rotary disk;
each of the plurality of flexible replacement blades including a front contact smoothing portion with an upturned outer peripheral edge, an intermediate portion extending therefrom and connecting to a rear end of the front contact smoothing portion at an inclined angle, and a rear flat portion having a rear end and extending therefrom and connecting to the intermediate inclined angle portion forming a unitary member;
each of the rear flat portions of the plurality of flexible replacement blades includes at least a pair of elongated securing slots located at a back end thereof for aligning with each of the plurality of spaced apart screw holes in the rotary disk;
a plurality of screw members inserted through each of the at least a pair of elongated securing slots and through each of the spaced apart screw holes of the rotary disk for adjustably securing each of the plurality of flexible replacement blades directly to the rotary disk at a selective position near and inward of an outer peripheral edge of the rotary disk, each of the at least a pair of elongated securing slots of each of the plurality of flexible replacement blades allows each of the plurality of flexible replacement blades to be adjusted near and inward of the outer peripheral edge of the rotary disk to adjustably align with any misaligned manufactured spaced apart screw holes in the rotary disk; and
a free-rotating bearing guide ring assembly being co-operably attached to and inward of the outer peripheral edge of the rotary disk, and each of the plurality of flexible replacement blades are adjustable along each of the at least a pair of elongated slots to secure each of the plurality of flexible replacement blades at a selective position at and adjacent to the outer peripheral edge of the rotary disk by each of the plurality of screw members so that each of the plurality of flexible replacement blades are able to finish closely to wall structures and around electrical and plumbing stub obstructions that extend through concrete surfaces, wherein each of the plurality of flexible replacement blades are made from plastics or metals.