| 摘要 |
A buffered guard clearance system for riding and manually pushed powered trowels adapted to allow finishing of a slab surface immediately adjacent an obstacle. The system comprises a movable wing displaceably coupled to the trowel guard cage and a buffer system mounted thereto. The wing is displaceable between a deployed position generally aligned with a lower ring of the cage and a retracted position. When retracted, an unguarded segment of the trowel rotor sweep is established that allows the finishing blades to be deployed immediately adjacent a wall or other obstacle. A displaceable coupling for moving the wing between the deployed position and the retracted position extends from the cage to the wing. The coupling comprises a sliding crossmember mounted on two spaced-apart brackets fixed to the cage. The crossmember supports the wing. The coupling may alternatively comprise electromechanical elements for displacing the wing between deployed and retracted positions. The buffer system contacts the wall to facilitate forward and rearward sliding movement of the trowel along the wall while finishing the slab immediately adjacent the wall. The preferred buffer system comprises a molding that snap-fits over the wing. The molding may be removed and replaced as necessary.
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