Patent US3571839A successfully refreshed from Google Patents.
US3571839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for removing the excess material obtained when trimming the top side of plastic foam concrete blocks
Assignee: Individual
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Filing: 1968-10-28
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Granted: 1971-03-23
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Expires: 1988-10-28
Abstract
Abstract A device for removing the material trimmed from the top side of plastic foam concrete blocks in which a suction box is lowered onto and travels across the concrete block. The suction box has a grid with a plurality of fine openings therein all being connected to a suction fan which generates a negative pressure in the suction box.
Inventors
- 👤 Wilfried Hartmann
- 👤 Josef Vogele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:31
CPC Classifications
B; B28; B28B; B28B11/00; B28B11/12; B28B17/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
Apparatus for removing the excess material obtained from cutting the top side of foamed concrete blocks, comprising: a suction box adapted to be lowered into close association with the concrete block and be moved across the top surface thereof, the underside of the suction box which is adapted to face the concrete block having a plurality of openings therein; a suction fan connected to the suction box for generating a negative pressure; a drum rotatably supported on the suction box; and a flexible cover foil, one end of which being wound onto the rotatable drum, the other free end thereof being guided along both longitudinal sides of the suction box and adapted to cover selected ones of the openings.
Claim 2
Dependent Claim
119 words
Apparatus for removing the excess material obtained from cutting the top side of foamed concrete blocks, comprising: a suction box adapted to be lowered into close association with the concrete block and be moved across the top surface thereof, the underside of the suction box which is adapted to face the concrete block having a plurality of openings therein; a suction fan connected to the suction box for generating a negative pressure; a drum rotatably supported on the suction box; and a flexible cover foil, one end of which being wound onto the rotatable drum, the other free end thereof being guided along both longitudinal sides of the suction box and adapted to cover selected ones of the openings.
Claim 3
Dependent Claim
14 words
Apparatus according to claim 1, including spring means for maintaining the cover foil tensioned.
Claim 4
Dependent Claim
109 words
Apparatus according to claim 2, wherein the free end of the cover foil is guided for movement along the suction box by two pairs of longitudinally spaced chain wheels on each side of the suction box, one of the chain wheels in each pair being operatively connected in association with the rotatable drum, a chain guided by each of said two pairs of longitudinally spaced chain wheels, the free end of the cover foil being attached to the chains for movement toward and Away from the rotatable drum to cover selected ones of the openings, and a hand crank drivingly connected to said rotatable drum for drivingly rotating same.
Claim 5
Dependent Claim
57 words
Apparatus according to claim 3, wherein said rotatable drum is freely rotatably supported on a shaft, said shaft being adapted to be rotatably driven by a crank handle, the pair of chain wheels operatively connected in association with the rotatable drum being fixedly mounted to said shaft, said shaft and said drum being interconnected by spiral springs.
Claim 6
Dependent Claim
16 words
Apparatus according to claim 1, wherein the cover foil consists of a fabric coated with plastic.
Claim 7
Dependent Claim
26 words
Apparatus according to claim 1, wherein the openings in the underside of the suction box are defined by a suction grid consisting of a wire sieve.
Claim 8
Dependent Claim
32 words
Apparatus according to claim 6, wherein the suction grid consists of a fine meshed wire sieve and a coarse support grid arranged thereabove and connected at several places to the wire sieve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |