US3948005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling grinding apparatus
Assignee: Individual
•
Filing: 1975-01-03
•
Granted: 1976-04-06
•
Expires: 1995-01-03
Abstract
Abstract A ceiling grinding apparatus for use in surfacing concrete ceilings comprising a portable support assembly having independently suspended wheels; a central member vertically movable along the support assembly; a boom pivotally mounted on the central member; a grinding assembly coupled to one end of the boom including blade means rotatably supported in a housing; and a biasing mechanism for forcing the blade means against the ceiling during the grinding operation. An exhaust system is connected to the housing for removing the dust and concrete chips therefrom and transferring this material to a collection bag. A hydraulic motor is used to rotate the blade means and is driven by a hydraulic pump coupled to an electrical motor, with the hydraulic fluid being stored in the central member.
Inventors
- 👤 Jack W. Whitsett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:44
CPC Classifications
B; B24; B24B; B24B7/00; B24B7/10; B24B7/18; B24B7/182
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
248 words
A ceiling grinding apparatus, the combination comprising: a portable support assembly; a central elongated member coupled to said support assembly for vertical movement; a boom assembly pivotally mounted on the top of said central member; a grinding assembly coupled to a first end of said boom assembly, said grinding assembly including blade means for grinding the ceiling and rotation means for rotating said blade means; biasing means for biasing the second end of said boom assembly downwards and said first end upwards to force said blade means against the ceiling; and elevating means carried on said support assembly for moving said central member vertically upward and downward, said support assembly including first and second elongated structural members located in the same vertical plane and oriented at an angle of approximately 40° to each other. third and fourth elongated structural members located in the same vertical plane and oriented at an angle of approximately 40° to each other, a horizontally oriented cross bar coupled at one end to said first and second structural members and at the other end to said third and fourth structural members, clamping means on said cross bar for releasably supporting said central elongated member in a vertical position, four wheels, each independently and rotatably coupled at the bottom of one of said elongated structural members, and a plurality of horizontally oriented struts interconnecting said elongated structural members, the lowermost thereof being at a height approximately equal to one-third the height of said structural members.
Claim 2
Dependent Claim
248 words
A ceiling grinding apparatus, the combination comprising: a portable support assembly; a central elongated member coupled to said support assembly for vertical movement; a boom assembly pivotally mounted on the top of said central member; a grinding assembly coupled to a first end of said boom assembly, said grinding assembly including blade means for grinding the ceiling and rotation means for rotating said blade means; biasing means for biasing the second end of said boom assembly downwards and said first end upwards to force said blade means against the ceiling; and elevating means carried on said support assembly for moving said central member vertically upward and downward, said support assembly including first and second elongated structural members located in the same vertical plane and oriented at an angle of approximately 40° to each other. third and fourth elongated structural members located in the same vertical plane and oriented at an angle of approximately 40° to each other, a horizontally oriented cross bar coupled at one end to said first and second structural members and at the other end to said third and fourth structural members, clamping means on said cross bar for releasably supporting said central elongated member in a vertical position, four wheels, each independently and rotatably coupled at the bottom of one of said elongated structural members, and a plurality of horizontally oriented struts interconnecting said elongated structural members, the lowermost thereof being at a height approximately equal to one-third the height of said structural members.
Claim 3
Dependent Claim
37 words
An apparatus according to claim 1, wherein said elevating means includes a winch, a cable carried by said winch, and means, coupled to said central member, for attaching an end of said cable to said elongated member.
Claim 4
Dependent Claim
38 words
An apparatus according to claim 1, and further including a collecting container coupled to said support assembly; and exhaust means for conducting the material grinded from the ceiling away from said blade means and into said collecting container.
Claim 5
Dependent Claim
75 words
An apparatus according to claim 3, wherein said exhaust means includes a housing coupled to said boom assembly and partially surrounding said blade means, said housing having an aperture therein, a conduit having one end communicating with the interior of said housing through said aperture and another end communicating with said collecting container, and a vacuum pump coupled to said conduit for drawing air and the material grinded from the ceiling into said collecting container.
Claim 6
Dependent Claim
14 words
An apparatus according to claim 1, wherein said rotation means includes a hydraulic motor.
Claim 7
Dependent Claim
23 words
An apparatus according to claim 5, wherein said central member is a closed tube and carries the hydraulic fluid for said hydraulic motor.
Claim 8
Dependent Claim
20 words
An apparatus according to claim 1, wherein said blade means comprises two elongated, straight blades pivotally mounted adjacent each other.
Claim 9
Dependent Claim
55 words
An apparatus according to claim 1, wherein said biasing means includes a spring coupled at one end to said boom assembly, an elongated chain coupled at one end to said support assembly, and hook means for coupling said spring and chain together to vary the biasing force between said support assembly and said boom assembly.
References Cited (Backward Citations)
US1728487A
Cited
US2670577A
Cited
US2755606A
Cited
FR1195454A
Cited
US3268935A
Cited
US3522679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |