A mounting adapter for rotatably mounting a tool holding body having first and second surfaces on at least one spider arm of a motor driven rotatable spider assembly of a surface processing apparatus, said mounting adapter comprising: bearing means supported by said second surface; a first aperture extending centrally through said first and second surfaces; a rubber flex pad having a second aperture in vertical registry with and beneath said first aperture; means supporting said rubber flex pad along its periphery and having a third aperture in vertical registry with and beneath said second aperture; an end plug within said third aperture for closing the second aperture, said end plug supporting said flex pad from beneath said third aperture; said rotatable hub of said bearing means including attachment means in the upper portion thereof for facilitating non rotatable attachment to a mounting means adapted for attachment to said spider arm.

A mounting adapter for rotatably mounting a tool holding body having first and second surfaces on at least one spider arm of a motor driven rotatable spider assembly of a surface processing apparatus, said mounting adapter comprising: bearing means supported by said second surface; a first aperture extending centrally through said first and second surfaces; a rubber flex pad having a second aperture in vertical registry with and beneath said first aperture; means supporting said rubber flex pad along its periphery and having a third aperture in vertical registry with and beneath said second aperture; an end plug within said third aperture for closing the second aperture, said end plug supporting said flex pad from beneath said third aperture; said rotatable hub of said bearing means including attachment means in the upper portion thereof for facilitating non rotatable attachment to a mounting means adapted for attachment to said spider arm.

A power trowel blade that is made of non-rusting solid component material for use with a power trowel apparatus. The trowel blade include a mounting surface and an oppositely facing finishing surface. The finishing surface is flush and free of voids or protrusions. The flush finishing surface prevents surface material being collected as the trowel blade is used to finish surfaces to a hard finish.

The invention provides a float trowel blade attachment for cement floor finishers comprising a rectangular section of sheet metal having a top surface and a bottom surface and having its edges optionally bent upwardly, means for providing to the top surface a three-sided rearwardly open pocket on the back of the section adjacent the leading edge thereof adapted to partially receive a finish trowel blade of the finisher, a spring clip secured to the top surface or the pocket-forming means and extending rearwardly therefrom so as to be engageable with the finish trowel blade to retain the section thereon, and wherein said rectangular sheet metal has attached to its bottom surface using an adhesive or mechanical attachment material interlayer, a composite rigid abrasive element bonded to a resilient backing and wherein said abrasive element comprises a substrate of two or more non woven layers pads including holes for inserting grinding and polishing elements.

An improved mini-trowel attachment assembly having a rotary stabilizer with a plurality of screw holes disposed therein with a plurality of replacement blades secured therein by a plurality of screw members. The plurality of replacement blades include at least a pair of elongated adjustable slots that allows the replacement blades to be adjusted inward of the outer peripheral edge of the rotary stabilizer. A free-wheeling self-lubricating bearing assembly having a first non-rotary bearing and spacer ring member attached to the rotary stabilizer and a second free-wheeling member attached to the first non-rotary bearing and spacer ring member that freely rotates when it engages wall structures and upstanding obstructions in concrete surfaces. Also, the elongated slots allows the replacement blades to be adjusted inward of the outer peripheral edge of the free-wheeling self-lubricating bearing assembly.

A concrete finishing system may include a surface sensor, a depiction generator for generating a depiction of a profile of the concrete surface, and a display for displaying the depiction. The system may be used to perform a method of finishing concrete including arranging a surface sensor such that a work area for placement of the concrete is within a field of view of the surface sensor, capturing surface profile data of a surface of the concrete during placement or finishing of the concrete, generating a surface profile depiction based on the surface profile data, displaying the surface profile depiction, and informing personnel regarding a variation in height based on the depiction. The concrete slab formed with this process may include a floor flatness value above 35 and a surface free of ground areas and free of filled areas.

A mounting adapter including a bearing for rotatably mounting a surface processing tool to a tool holder body. The bearing has a rotatable hub including an attachment in an upper portion thereof for non-rotatable attachment to the tool holder body. The mounting adapter includes a rubber flex pad having a periphery and a first aperture. The mounting adapter includes an element supporting the periphery of the rubber flex pad, the element having a second aperture in vertical registry with and beneath the first aperture. The mounting adapter includes an end plug within the second aperture for closing the first aperture. The end plug supports the flex pad from beneath the second aperture.

A grouting pan assembly includes a reinforcement ring. In another aspect, a grouting pan includes a substantially planar bottom surface and a curved sidewall surrounding the bottom surface. In a further embodiment, a grouting pan assembly includes a grouting pan having a post or mechanical fastener extending from a backside thereof for attachment to a reinforcing ring or layer.

An adaptive balancing mechanism of dual-head cement trowelling machine includes a water tank, a screw support base, an adjusting screw, a sensor and controller, a counterweight, a stepper motor, an underframe, a guide rail, a guide rail support plate, limit plates, and a transmission member. The controller collects the weight change information of the water in the water tank in real time according to the operation process. Adjust the position of the counterweight in real time by the stepper motor and the adjusting screw to make the two trowel heads in adaptive dynamic balance to the ground pressure.

A concrete smoothing assembly is provided. The assembly includes a plurality of blades extending radially from a central hub. The central hub is attachable to a rotating power tool to effectively rotate the blades about a vertical axis. The blades are angled at an offset angle with respect to a horizontal axis, each with a lower working edge adapted to sweep imperfections from a surface of partially dried concrete.