US3571839A - Apparatus for removing the excess material obtained when trimming the top side of plastic foam concrete blocks - Google Patents

Apparatus for removing the excess material obtained when trimming the top side of plastic foam concrete blocks Download PDF

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Publication number
US3571839A
US3571839A US770940A US3571839DA US3571839A US 3571839 A US3571839 A US 3571839A US 770940 A US770940 A US 770940A US 3571839D A US3571839D A US 3571839DA US 3571839 A US3571839 A US 3571839A
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United States
Prior art keywords
suction box
suction
rotatable drum
openings
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US770940A
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English (en)
Inventor
Wilfried Hartmann
Josef Vogele
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Individual
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Individual
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Filing date
Publication date
Priority claimed from DE19671683837 external-priority patent/DE1683837C/de
Application filed by Individual filed Critical Individual
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Publication of US3571839A publication Critical patent/US3571839A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/12—Apparatus or processes for treating or working the shaped or preshaped articles for removing parts of the articles by cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping

Definitions

  • the suction box has a grid with a plurality of fine 306, 308,415,418,422;51/273;25/(lnquired); openings therein all being connected to a suction fan which /(Inquired); 294/64; 214/1 (BS), 1 (BS)2 generates a negative pressure in the suction box.
  • Foam concrete blocks are cast in large boxes. Each block is then transferred to the table of a cutting machine where it is cut into slabs and the like by means of a cutting device. During this procedure a layer, which has a thickness of between ap proximately 3 to cm. (1.2 to 4 inches), is cutoff, by means or a horizontal cutting wire, from the surface of the foam concrete block while still in a plastic state.
  • a further disadvantage consists in that the sweeping or removal procedure is time consuming, requires several workmen and in addition does not result in complete cleaning of the top surface of the block.
  • the object of the present invention is to provide an apparatus of the type mentioned above by means of which, with the least possible use of implements and in a single operation, all excess material can be removed from the top surface of the block, while, at the same time, avoiding any damage to the delicate foam concrete block.
  • a suction box which can be lowered onto and be moved across the top of the concrete block, the lower surface of the said suction box which faces the concrete block consisting of a suction grid having a plurality of line openings and being connected via connecting pipe lines to a suction fan or the like which generates a negative pressure.
  • the suction box may have roughly the same shape in plan as the largest concrete block which can be cast in a particular works and is preferably of relatively flat construction, since, for a given suction fan output, the negative pressure in the suction box required to lift the excess material is more rapidly reached the smaller is its volume.
  • the lowest limits for the height dimensions of the suction box are therefore only determined by requirements of strength as well as the requirement that the air current caused by the suction fan is not subject to large losses.
  • the necessary negative pressure in the suction box depends essentially upon the weight to be carried, that is upon the specific gravity and the volume of the excess layer. With a specific gravity of approximately 1 and an average thickness of the layer of between 3 and 10 cm. (1.2 to 4 inches) a pres sure difference between the outside atmosphere and the interior of the suction box of only 0.03 kgJcmF, corresponding to 0.03 atmospheres (.427 pounds per sq. inch), has proved to be sufficient to aspirate and effectively hold the excess materiall. With this negative pressure comparatively large excess material up to approximately cm. (6 inches) can be aspirated and held.
  • the size of the opening as well as the width of the webs remaining between them should be small as possible as the excess material breaks up during cutting and also during the suction procedure and partially into very small individual pieces. Suction grids have proved to be satisfactory in which the openings have a width of approximately 1 mm.(0.04 inch).
  • Flt l is a suction box seen from below;
  • FIG. 3 is a view of a winding device for winding up a roller blind cover taken along the line ill-dill of FIG. l;
  • FIG. 4 shows the details of a suction grid.
  • a rectangular suction box 33 is illustrated by way of an example.
  • This suction box is made up of an angle iron frame 1 and a cover plate 2 and is closed at the bottom by means of the suction grid t.
  • the suction box 3 is suspended from reinforcing struts d from a support frame 6 of rooflike construction.
  • loops or eyelets '7 are arranged by which the supporting frame 6 may be suspended and moved by a lifting crane in the direction indicated by the two arrows d.
  • the supporting frame 6 also accommodates a suction fan 9 arranged above the suction box 3, the suction side of the said fan being connected by a pipeline it) which passes through the cover plate 2 to the inside of the suction box 3, its exhaust outlet lll leading to atmosphere.
  • the fan 9 is driven by an electric motor 12.
  • roller blind cover l3 which'can lie pulled in a longitudinal direction over the lower side of the suction grid 5.
  • the roller blind cover is retractable by means of the winding device l l actuated by the crank handle 15.
  • the free end 16 of the roller blind cover is reinforced by the strap 17 which is conveniently of L-shaped cross section.
  • the strap i7 is secured at either end to one of two endless chains 1.9 arranged on both sides of the suction box and driven by the crank handle 15.
  • sprockets id are provided over which the chains l9 run on the one end of the device.
  • the chains run over freely rotatable guide sprockets 2b which are arranged on both sides of the suction box. These sprockets also serve as tensioners for the chains 19.
  • H6. 3 an embodiment of a winding device 30 is illustrated by means of which a continuous and even tightening effect and thus a perfectly tight fitting of the roller blind against the suction grid may be achieved.
  • a hollow winding drum 30 is fitted concentrically with and freely rotatably on a central shaft 35 and connected thereto by means of spiral springs 32.
  • the guide sprockets lb for the endless chains are arranged on the shaft 33d. For reasons of clarity this latter arrangement is not illustrated in H6. 3.
  • the roller blind cover which is wound onto the winding drum and provided with an angle section strap Ill secured to the chains l9 which are also not illustrated is equally prestressed by the tensioned spiral springs in any position of the roller blind cover.
  • MG. 4 shows a suitable arrangement of the suction grid.
  • a time mesh sieve dil manufactured, for example, of stainless steel wire with a mesh of approximately 1 mm. (0.04 inches) forms the suction grid proper against which the aspirated excess material abuts.
  • line sieves generally do not have sufficient rigidity, a stronger supporting grid M of stronger wire and a larger mesh size is secured to the sieve ltl at several points distributed over the sieve surface, for example by means of binding wire.
  • suction grids fine nylon nets or expanded metal nets are also suitable.
  • the top cover of the suction box preferably consists of a plastic covered fabric so that it is impervious to air and unaffected by the foam concrete material.
  • the mode of operation of the apparatus is as follows: After cutting off the excess material 50 (MG. 2) the suction box 3 which has a breadth corresponding to the breadth of the concrete block, is lowered, with the suction fan running, over the concrete block 51 in such a manner that it is a short distance above the bloclt. Care should be taken that the left end of the suction box terminates at the corresponding end surface of the concrete bloclr.
  • the effective surface of the suction grid is adjusted to correspond to the length of the concrete block by appropriately pulling out the roller blind cover.
  • the suction fan running the support frame 6 is lifted, for example, by lifting a crane and conveyed to the position where the excess material can be offloaded, possibly to a hopper situated adjacent the cutting machine, where a conveyor or the like is located below the said hopper which transports the foamed concrete bulk to a processing plant.
  • the suction fan is switched off, the excess material drops off and the suction box is again ready for use.
  • the apparatus according to the invention is not lowered onto the foamed concrete block, but rather to a distance of about 3 cm.( 1.2 inches) above it, it doesnot make any contact at all with the concrete block so that any damage to the block during the removal of the excess material is thus effectively avoided.
  • Apparatus for removing the excess material obtained from cutting the top side of foamed concrete blocks comprismg:
  • 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 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.
  • Apparatus according to claim 1 including spring means for maintaining the cover foil tensioned.
  • Apparatus according to claim 1 wherein the cover foil consists of a fabric coated with plastic.
  • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
US770940A 1967-11-15 1968-10-28 Apparatus for removing the excess material obtained when trimming the top side of plastic foam concrete blocks Expired - Lifetime US3571839A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671683837 DE1683837C (de) 1967-11-15 1967-11-15 Vorrichtung zum Entfernen des beim Beschneiden der Oberseite von plastischen Porenbetonblöcken od. dgl. anfallenden Materialüberstands

Publications (1)

Publication Number Publication Date
US3571839A true US3571839A (en) 1971-03-23

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ID=5687191

Family Applications (1)

Application Number Title Priority Date Filing Date
US770940A Expired - Lifetime US3571839A (en) 1967-11-15 1968-10-28 Apparatus for removing the excess material obtained when trimming the top side of plastic foam concrete blocks

Country Status (4)

Country Link
US (1) US3571839A (de)
JP (1) JPS4829368B1 (de)
AT (1) AT286855B (de)
FR (1) FR1591821A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970223A (en) * 1974-04-04 1976-07-20 Longinotti S.P.A. Material metering units
US4187052A (en) * 1974-08-17 1980-02-05 Hergeth KG. Maschinenfabrik und Apparatebau Method of opening bales
US4255829A (en) * 1978-06-26 1981-03-17 Biuro Projektowo-Konstrukcyjne Mechanizacji Budownictwa Zremb Installation for removal of surplus material from a block of cellular concrete
US4680199A (en) * 1986-03-21 1987-07-14 United Technologies Corporation Method for depositing a layer of abrasive material on a substrate
US4803034A (en) * 1983-05-19 1989-02-07 Machinefabriek De Remise B.V. Concrete fabrication and concrete suctioning method
US6425565B1 (en) * 1999-11-16 2002-07-30 Creo Srl Method and apparatus for the use of suction cups on delicate surfaces
US20090097953A1 (en) * 2007-10-12 2009-04-16 R.A. Jones & Co., Inc. Device for moving packages and methods of using the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR376356A (fr) * 1907-06-09 1907-08-07 Andre Kauffer Appareil pour enlever la poussière par aspiration
US1322361A (en) * 1919-11-18 Vacuum separating apparatus
US2531920A (en) * 1945-12-18 1950-11-28 Raminger Martha Suction ash collector
DE1150789B (de) * 1957-10-30 1963-06-27 Georg Moessmer Dipl Ing Absaugvorrichtung fuer Steinmetzarbeiten
US3420004A (en) * 1965-05-28 1969-01-07 Kirkhof Mfg Corp Formed plastic article de-sliver unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1322361A (en) * 1919-11-18 Vacuum separating apparatus
FR376356A (fr) * 1907-06-09 1907-08-07 Andre Kauffer Appareil pour enlever la poussière par aspiration
US2531920A (en) * 1945-12-18 1950-11-28 Raminger Martha Suction ash collector
DE1150789B (de) * 1957-10-30 1963-06-27 Georg Moessmer Dipl Ing Absaugvorrichtung fuer Steinmetzarbeiten
US3420004A (en) * 1965-05-28 1969-01-07 Kirkhof Mfg Corp Formed plastic article de-sliver unit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970223A (en) * 1974-04-04 1976-07-20 Longinotti S.P.A. Material metering units
US4187052A (en) * 1974-08-17 1980-02-05 Hergeth KG. Maschinenfabrik und Apparatebau Method of opening bales
US4255829A (en) * 1978-06-26 1981-03-17 Biuro Projektowo-Konstrukcyjne Mechanizacji Budownictwa Zremb Installation for removal of surplus material from a block of cellular concrete
US4803034A (en) * 1983-05-19 1989-02-07 Machinefabriek De Remise B.V. Concrete fabrication and concrete suctioning method
US4680199A (en) * 1986-03-21 1987-07-14 United Technologies Corporation Method for depositing a layer of abrasive material on a substrate
US6425565B1 (en) * 1999-11-16 2002-07-30 Creo Srl Method and apparatus for the use of suction cups on delicate surfaces
US20090097953A1 (en) * 2007-10-12 2009-04-16 R.A. Jones & Co., Inc. Device for moving packages and methods of using the same

Also Published As

Publication number Publication date
JPS4829368B1 (de) 1973-09-10
FR1591821A (de) 1970-05-04
AT286855B (de) 1970-12-28

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