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US3701221A Expired / Lapsed US ⏱️ 0.0 years remaining

Dry grinding terrazzo floor finishing machine

Assignee: Individual
•
Filing: 1971-04-07
•
Granted: 1972-10-31
•
Expires: 1991-04-07
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Abstract

Abstract The invention relates to a machine for the dry grinding of terrazzo floors and particularly to the utilization of a vacuum cleaner attachment for the collection and control of dust raised during the grinding operation. This dust comprises fine particles ground from the floor, sand used for dressing the grinding stones and small particles worn from the grinding stones. A chamber of the machine in which the grinding stones are disposed has a vacuum pick-up head and the chamber is formed in part by a loose fitting skirt assembly which is resiliently biased in a downwardly direction. A wear shroud forming the lower part of the skirt assembly is biased into firm engagement with the floor and adjustable vent plates are provided for controlling the flow of air through the chamber. The dust collecting assembly for the machine comprises a drum unit mounted on a wheeled cart which is closely coupled to the machine so that the drum unit is within the lateral confines of the handle of the machine.

Inventors

  • 👤 Frank P Vinella

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 21:51
CPC Classifications
B; B24; B24B; B24B7/00; B24B7/10; B24B7/18; B24B7/186

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 110 words
A terrazzo floor grinding machine comprising a generally rectangularly shaped support structure, a plurality of grinding stone carriers rotatably mounted on the underside of said support structure, said support structure having smoothly merging lower sidewalls, a generally rectangularly shaped skirt assembly forming a chamber beneath the underside of said support member, said skirt assembly having its upper portion formed with a sealing member and its lower portion formed with a shroud wear member, said sealing member having a lip in sealing engagement with said support structure lower sidewalls, means for applying a vacuum to said chamber, and adjustable vent means for controlling the degree of vacuum applied to said chamber.
Claim 2
Dependent Claim 110 words
A terrazzo floor grinding machine comprising a generally rectangularly shaped support structure, a plurality of grinding stone carriers rotatably mounted on the underside of said support structure, said support structure having smoothly merging lower sidewalls, a generally rectangularly shaped skirt assembly forming a chamber beneath the underside of said support member, said skirt assembly having its upper portion formed with a sealing member and its lower portion formed with a shroud wear member, said sealing member having a lip in sealing engagement with said support structure lower sidewalls, means for applying a vacuum to said chamber, and adjustable vent means for controlling the degree of vacuum applied to said chamber.
Claim 3
Dependent Claim 51 words
A machine according to claim 1 wherein said skirt assembly includes a generally rectangularly shaped support member, said sealing member being attached to said support member, said shroud wear members being reversibly attached to said support member so that the upper and lower edges thereof may be used as wearing edges.
Claim 4
Dependent Claim 34 words
A machine according to claim 1 including vertically extending brackets attached to said skirt assembly, and resilient means between said brackets and said support structure for resiliently biasing said skirt assembly towards the floor.
Claim 5
Dependent Claim 39 words
A machine according to claim 2 wherein two of said shroud wear members are spaced apart, a vent plate disposed between said two wear members, said plate being vertically adjustable for adjusting the venting of air into said chamber.
Claim 6
Dependent Claim 58 words
A machine according to claim 1 including a carriage having two wheels and a pair of forwardly extending arms attached to said support structure, said carriage having a rearwardly inclined rectangularly shaped handle, a wheeled cart attached to said carriage, a drum shaped vacuum cleaner unit mounted on said cart and within the lateral confines of said handle.

References Cited (Backward Citations)

DE1068145B Cited
US3124911A Cited
US2201420A Cited
US3102372A Cited
US3452486A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-10-31 1976-05-01 1976-10-31 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-10-31 1980-05-01 1980-10-31 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-10-31 1984-05-01 1984-10-31 $7700.00 Window Closed / Lapsed

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