Importance

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Abstract

A concrete placing, screeding and finishing tool that bypasses columns, curbs and other obstacles during concrete finishing. An elongated finishing body comprises retractable bypass wings. The body comprises a front strike-off, a trailing float and a primary eccentrically weighted shaft extending through the body for vibrating it when vigorously rotated, The bypass is coupled to an outer end of the body and may be deployed either in an active position, aligned with the body for finishing concrete, or in a displaced clearance orientation out of contact with the concrete, The bypass comprises a finishing wing, a linkage system and a vibration mechanism, The wing comprises a forward strike-off, a trailing float and a reinforcing tread plate extending from the strike-off to the bull float, The linkage system comprises a bracket secured to an end of the body and a pair of locking, slidable struts extending from the bracket to the wing. Pivot bolts connect the strike-off of the wing to the strike-off of the body and the bull float of the wing to the bull float of the body. The preferred vibration mechanism comprises a secondary, eccentrically weighted shaft for vibrating the wing when rotated and a coupling releasably joining the secondary shaft to the primary shaft when the wing is actively deployed. The coupling comprises semicylindrical primary and secondary shaft ends and a spring biased collar slidably sleeved on one of the shafts for selectively coaxially coupling the semicylindrical ends.

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First Claim