US3598439A - Lifting heads for palletizers - Google Patents

Lifting heads for palletizers Download PDF

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Publication number
US3598439A
US3598439A US3598439DA US3598439A US 3598439 A US3598439 A US 3598439A US 3598439D A US3598439D A US 3598439DA US 3598439 A US3598439 A US 3598439A
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Prior art keywords
recesses
chamber
air
perforate member
predetermined
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English (en)
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Ernst A Dahlquist
Stanley J Polakowski
Teunis Vaalburg
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Rapistan Inc
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Rapistan Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/02—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by suction means
    • B66C1/0237—Multiple lifting units; More than one suction area
    • B66C1/025—Divided cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G57/00—Stacking of articles
    • B65G57/02—Stacking of articles by adding to the top of the stack
    • B65G57/03—Stacking of articles by adding to the top of the stack from above
    • B65G57/04—Stacking of articles by adding to the top of the stack from above by suction or magnetic devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/02—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by suction means
    • B66C1/0287—Other shapes, e.g. triangular or oval
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7869—Biased open
    • Y10T137/7871—Weight biased
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7897—Vacuum relief type

Definitions

  • the device consists of a head having a primary chamber from which the air is exhausted.
  • the bottom of the primary chamber is formed by a grate creating a number of small individual air passages.
  • a number of these individual openings are equipped with valves, each individually operable. These valves open and close in response to a predetermined amount of air pressure differential across the valve. The valves close to shut off the flow of air into the primary chamber through those individual air passages not closed off by the articles to be lifted.
  • the vacuum lift heads of palletizers are built to have an overall air intake opening sized to fit the tier of greatest perimeter.
  • the opening is normally subdivided by a grid or other means into a plurality of subopenings or individual air passages.
  • Certain groupings of articles leave substantial areas at the perimeter of the tier which are not covered by the articles. Also the chimneys remain open.
  • the volume of air which can enter through these unused openings is so great that the head must have excessive airpumping capacity to create sufficient vacuum to lift the articles.
  • Such an arrangement is initially expensive and bulky. It is also both expensive and noisy to operate. Further, even with excessive air-pumping capacity, the equipment can only handle relatively minor variations in tier size.
  • This invention overcomes these problems by providing a head having its air intake subdivided into a plurality of small individual air passages by a grate.
  • the individual air passages around the perimeter of this grate are equipped with individual leaf valves, each formed from a thin resilient material such as spring steel.
  • the nature of this invention is such that all air passages in the grate may be equipped with these valves.
  • Each valve has at least a portion adjacent the opening to the primary chamber to form a normally open air passage. However, when the air pressure differential across the valve exceeds a predetermined value, the valve is caused to close. In the preferred embodiment, this portion is an arch biased outwardly away from this opening.
  • valves are provided in those areas where chimneys'may be formed.
  • all of the air passages, not closed by the presence of an article are automatically closed off by the valves.
  • the construction of the valve is such that it adds substantially no weight'to the head, applies no load to the articles acting against the effect of the vacuum and is positive in its closing action when the required air pressure differential is attained.
  • FIG. I is a bottom view of a vacuum-operated lifting head equipped with this invention.
  • FIG. 2 is a side elevation view of the lifting head
  • FIG. 3 is an enlarged bottom view of one of the valves
  • FIG. 4 is a sectional elevation view taken along the plane IV-IV of Fig. 3 showing the valve open;
  • FIG. 5 is a sectional elevation view taken along the plan V-V of Fig. 4;
  • FIG. 6 is a view similar to Fig. 4 showing the valve closed
  • FIG. 7 is a view similar to Fig. 1 showing a modified construction
  • FIG. 8 is a plan view of a typical tier of articles
  • FIG. 9 is a somewhat schematic view illustrating the operation of the valves.
  • FIG. 10, 11 and 12 are schematic views illustrating the functional principles of the invention.
  • FIG. 13 is a fragmentary perspective view of the backing plate used with the valves.
  • FIG. 14 is a fragmentary sectional view taken along the plane XIV-XIV ofFig. 1.
  • a side elevation view of the vacuum head 10 is shown.
  • This consists of a rectangular frame 1 1, an air pump or blower chamber l2 and a motor 13 for the blower. Clamped to the lower edge of the frame .11 is a subframe 14. The attachment is made by the fasteners 15. It will be understood that the top of the frame 1 1 is closed except for the opening into the blower chamber 12 and a relief port 17. This forms a primary chamber 16 (Fig. 2) above the subframe 14. The relief port 17 communicates with the primary chamber. Air exhausted by the fan or blower exits via the blast port 18 which is equipped with a closure gate. All of the preceding structure is conventional and further description of it is unnecessary.
  • the entire head is mounted by suitable means by which it can be raised and lowered and, in addition, has means to guide it for both vertical and horizontal movement.
  • suitable means by which it can be raised and lowered and, in addition, has means to guide it for both vertical and horizontal movement.
  • This again is conventional, forms no part of the invention and, therefore, is not il lustrated.
  • Fig. 1 shows the subframe l4 surrounding a basically rectangular area, the center of which is occupied by a main grate 20, having on each side an auxiliary grate 21.
  • the grates form a backstop for articles held against the head by air pressure differential.
  • the main and auxiliary grates are formed of bars of rectangular cross section which intersect to form a rigid structure characterized by a plurality of individual air passages or openings 22 of generally rectangular shape. That portion of the lower face of the head not occupied by the main and auxiliary grates is closed off as by the closure plates 23 and 23a and the closure strips 24 and 24a.
  • the grate could be a single sheet of material with the depending structure supplied by the bars formed by sharply defined depending ridges surrounding the recesses. The sheet material would have an air passage in each of the recesses. Irrespective of whether this member is constructed as the grate illustrated or made in some other manner, it is a perforate member which forms a stop for the articles and provides numerous individual air passages opening into the primary chamber.
  • auxiliary grates 21 Referring first to the auxiliary grates 21 (Fig. 1), it will be noted that all of the openings 22 in the central portion of these grates are occupied by valves 30, one in each of the openings. At the ends of the grate and on each side of the valves, the openings are closed by seals 31.
  • the seals 31 are formed of a suitable material such as a foam rubber which is compressible and projects beyond the face of the grate for contact with articles. These seals prevent flow of air parallel to the face of the grate between the grate and the articles of the tier.
  • the seals 31 collectively form gaskets which isolate the valved openings or air passages from those which are not valved. It will be noted that a similar arrangement is provided along each of two sides of the main grate 20.
  • valves 30 Arranged symmetrically about the center of the grate 20 are four groups 32, 32a and 32b and 320 of valves 30. The purpose of these will be explained more fully hereinafter. Except in the areas where either the gaskets 31 or the valves 30 are provided, the openings 22 in the grate are free of obstruction, permitting air to pass through the grate into the primary chamber 16 under the inducement of the fan. When the fan is operating and the blast port is open, there is a differential in air pressure between the air below the grate and that within the primary chamber.
  • the main grate 20 and the auxiliary grates 21 are both seated within the subframe 14 and below the main frame 11 and, thus, below the primary chamber 16.
  • a backing plate 34 is mounted on the upper and inside face of the grate and separating the openings within the grate from the primary chamber.
  • a fragmentary portion of a typical backing plate is illustrated in Fig. 13.
  • these plates have a plurality of elongated slots 35 which form air passages communicating between the openings in the grate and the primary chamber.
  • the openings or air passages 35 are substantially smaller than the openings in the grate.
  • This arrangement provides a valve seat against which the valve member 40 can effect a seal.
  • the backing plates are secured to the grate so that even though a substantial air pressure differential exists between the outside of the head and the primary chamber, the plates cannot lift from the grate. It is also true that the grate is secured to the head so that it may not be raised by the force of the articles held against it as a result of the air pressure differential generated by the fan.
  • the backing plate and the grate could be a single integral structure. Such would be possible if the entire perforate member were cast.
  • the valve 30 consists of thin closure member 40 which is archedat the center to form a closure portion and on each end has an inclined or ramplike terminal portion 41.
  • the closure member 40 Approximately, at the juncture between the central arched portion and the terminal portions 41, the closure member 40 has openings 42 to receive the ends of the clip hanger 43.
  • the clip hanger 43 is generally U-shaped in cross section and has its ends inserted through the spaced openings 44 in the plate 34 and, by friction, the hanger is thus secured to the backing plate. This is all that is necessary inasmuch as the closure member 40 is a thin, light piece of material. Any other suitable means could be used to secure the valve member 40 such as drive screws, so long as the ends of the valve member are free to slide in response to the flexing of the valve.
  • the central portion of the hanger clip 43 is preferably arched toward the closure member to limit the closure members downward movement, although such an arrangement is not essential to the function of this invention.
  • the closure member 40 may be made of any lightweight, resilient material which also has sufficient strength to withstand the pressures exerted against it when it is in sealing or closure position. The material should also be resistant to fatigue failure resulting from frequent flexing as the valves open and close. A suitable material for this member is a thin spring steel.
  • the closure member is free to collapse and flatten against the backing plate 34 since the openings 42 are oversize with respect to the legs of the clip hanger 43.
  • the width of the closure member 40 must be such as to completely cover the air passage 35 and preferably seat over the adjacent portions of the backing plate on each side of the air passage to form an effective seal and also to support the closure member when it is in air-sealing position.
  • each valve 30 is a separate, self-contained assembly occupying only one of the openings 12, they can be arranged in various patterns within grates, and the number employed can be limited to those, necessary to satisfy the operating circumstances of the lifting head.
  • a pattern of the valves 30 is arranged about the perimeter of the opening in the head.
  • the fact that along two sides, the rows of valves are arranged in side-by-side relationship and alongthe other two sides each row is spaced from the adjacent row by a row of seals 31 is illustrated only. Any other pattern arrangement suitable to the operating circumstances of the head could be utilized.
  • the valve groups 32, 32a 32b and 320 are located to coincide with the chimneys which will be formed in the particular tier patterns to be employed.
  • the valves 30 in these groups are identical to those used at the perimeter of the head.
  • backing plates 34a are provided to support these valves. These are the same as the backing plates 34 except for their shape.
  • the purpose of these valves becomes clear when the tier (Fig. 8) is studied in which the articles 81 are so arranged as to create two diagonally positioned voids or chimneys 82 in the tier.
  • the two chimneys will align with two of the valve groups 32, 32a 32b and 320. Because overlapping of articles from tier to tier strengthens the load on the pallet, the next tier will normally be arranged with the chimneys 82 at the opposite corners.
  • the valve groups 32 and 32c may coincide with the chimneys in the tier and in the next tier it will be the valve group 32 a and 32b.
  • Fig. 7 illustrates a modification of the invention which would enable a lift head to accommodate much greater variation in tier size and shape.
  • a central grate 50 is utilized, surrounded by a plurality of auxiliary grates 51a and 51b. All of the openings 52 in the auxiliary grates, except those having seals, are equipped with valves 30 (not illustrated). These valves are arranged in groups in the auxiliary grates separated from each other by seals 31a.
  • the shape of the tier could be rectangular or square.
  • the operation of this modified head is the same as that of the head illustrated in Fig. 1 except for its greater flexibility of tier size and shape. Because the seals 31a occupy a substantially greater portion of the lower face of the head, there may be some reduction in the overall lifting capacity of the modified head.
  • the entire grate could be made up of sections similar to auxiliary grate 21 which are removably mounted in the head. For each section, two grates would be maintained, one with valves and one without.
  • additional grate sections equipped with valves could be substituted for grates without valves. To make this substitution, all that would be necessary would be to detach the subframe 14, exchange grates and reattach the subframe to the head. This type of arrangement would be quite satisfactory to adapt the lift head in situations where the use of the head for the different tier sizes was to continue for several hours.
  • the head is lowered until the grate and the seals 31 contact the articles of the tier.
  • the seals 31 project slightly beyond the bottom face of the grate to have an effective sealing action against the articles.
  • This gasket-forming action may be further increased by having the rows of seals projecting progressively greater distances from the grate, the more remote the seals are from the center of the grate. This is particularly important in effecting a seal adjacent the edge of the tier where the top of an article may slope downwardly away from the grate such as is illustrated in Fig. 9. In this type of situation, the greater projection of the peripheral seals will assure an effective airflow barrier.
  • valve d is schematically illustrated in Fig. 9.
  • valve 30e is illustrated by valve 30e in Fig. 9.
  • valve 30f in Fig. 9 the obstruction by the article 55 must be substantially complete before the valve will close. From tests run on this invention, it has been ascertained that a pressure difierential of l 1 inches of water is a satisfactory differential at which the valve can be designed to close.
  • the particular air pressure differential at which the valve will close can be varied in several ways such as by selection of the stiffness of the material used in making the valve. This can be controlled, for example, by the particular alloy used or by selection of a thinner or thicker material.
  • the maximum vacuum which can be generated in the primary chamber will of course be determined by the capacity of the fan.
  • a fan which can generate a differential of 25 to 26 inches of water has been found satisfactory. It has also been ascertained that a valve designed to close when the differential reaches 1 1 inches of water will close, if the effective air intake area to the opening is reduced to 0.2 of a square inch of efiective air intake area when the vacuum in the primary chamber has a value of approximately 20 inches of water. It will be seen that valve 30f as illustrated in FIG. 9, is nearing the critical threshold of pressure differential which will result in closure.
  • valve it is desirable that the valve remain closed unless a substantial portion of the opening is obstructed by an article. However, once the obstruction is such that the threshold pressure differential is not attained, the value must remain open. Otherwise, insufiicient openings will remain operative to retain the peripheral articles against the grate. It is at this point that the gaskets formed by the seals 31 become important. They form an effective seal against the articles. Those of the openings closed by articles and within areas surrounded by the gaskets will generate maximum air pressure differential and thus maximum lifting capacity.
  • Figs. l012. The arched configuration of the valve creates a pair of air passages and 90a (Fig. 12), one on each side. The flow of air through these passages is indicated by the arrows A.
  • the pressure differential between the primary chamber and the air passage increases, the velocity of the air increases as it bypasses the valve through the passages 90 and 90a.
  • the unbalance between the pressure acting against the upper face 91 of the valve and that acting against the lower face of the valve (arrows B) increases.
  • this pressure differential reaches approximately 1 1 inches of water, the resistance of the valve member 40 to collapse is overcome and the valve closes.
  • the vacuum falls so that there is less than about 11 inches of water differential, the valve members 40, because of their resilient bias, will automatically snap open.
  • the gate on the blast port 18 is closed This immediately reduces the fan's air-pumping capacity and the pressure differential between the primary chamber and the air passages decreases. This effect can be accelerated by open ing the relief port 17 to bleed air into the primary chamber. When the air pressure differential drops below than necessary to support the tier of articles, they will be released.
  • valves 30 only at the peripheral areas of the head
  • the invention provides an inexpensive, low-cost means which permits the lifting head to automatically adjust itself to accommodate a wide variety of load shapes and sizes. It also permits the use of a fan having only that capacity necessary to lift a tier of articles when substantially the entire bottom of the head is blocked off by articles because this is the condition which exists when the valves are closed even though only portion of the lower face of the head is covered by the articles. Reducing the capacity of the fan reduces the initial cost, operating cost and the noise incident to its use. Further, irrespective of fan capacity, it permits much greater variation in load size and shape than is possible without the valves.
  • a device for lifting by air pressure differential, a group of articles arranged in any one of several different predetermined patters said device having a housing defining a chamber, a perforate member forming a flat bottom face of said chamber and means to evacuate from said chamber air entering through said perforate member, the improvement therein comprising: said perforate member being a grate having intersecting walls defining a plurality of closely spaced recesses each forming an air passage through said grate; a plurality of normally open, air pressure differential responsive valves, one in each of a plurality of predetermined ones of said recesses, said predetermined recesses forming a band of recesses adjacent the perimeter of said housing; the remainder of said recesses including a plurality of valveless recesses located inwardly and adjacent the said band of recesses; a first flexible sealing gasket surrounding said grate and band of recesses at the outer perimeter thereof; a second flexible gasket at the inner perimeter of said band of recesses between said band of valved reces
  • a device for lifting by air pressure differential a group of articles arranged in any of several predetermined patterns said device having a housing-defining chamber, a perforate member forming one face and means to evacuate air from said chamber entering through said perforate member; said perforate member having depending elements forming a plurality of recesses each having an air passage therefrom communicating with said chamber the improvement in said device comprising: predetermined ones of said recesses being arranged in groups; a plurality of recesses in each of said groups; each group being adjacent a periphery of said perforate member; means forming a valve seat in each of said predetermined recesses; a valve member in each of said predetermined recesses; said valve member being of a thin resilient material and having a portion normally spaced from said valve seat means and supported in said spaced position by said resilience to permit the flow of air from said recess to said chamber; the resilient support of said portion being overcome and said portion shifting into sealing engagement with said valve seat means when the differential in air pressure between said chamber and the recess
  • each of said groups of recesses is surrounded by a resilient gasket, said gasket projecting downwardly beyond the lower face of said perforate member.
  • a device for lifting by air pressure differential a group of articles arranged in any of several predetermined patterns said device having a housing defining a chamber, a perforate member forming one face and means to evacuate air therefrom entering through said perforate member; said perforate member having a plurality of separate recesses each having an air passage communicating with said chamber, the improvement in said device comprising: said perforate member being divided into a plurality of separate and independent first sections and second sections each removably mounted to said housing and each having a plurality of said recesses; said first sections including a plurality of valveless recesses; said second sections each having a plurality of valves, one mounted in each of the recesses; sections of the type of said first sections being interchangeable with said second sections whereby the number and arrangement of recesses having valves may be changed by substituting one section for another.
  • each of said second sections has a peripheral gasket.
  • a device for lifting by air pressure differential a group of articles arranged in a predetermined pattern said pattern having one or more chimneys entirely surrounded by the articles, said device having a housing defining a chamber, a perforate member forming one face and means to evacuate air from said chamber entering through said perforate member; said perforate member having depending elements forming a plurality of recesses each having an air passage therefrom communicating with said chamber the improvement in said device comprising: individual valve means in predetermined ones of said recesses for controlling the flow of air therethrough, said predetermined recesses being arranged in a group or groups located on said perforate member to correspond to the location of the chimneys; means forming a valve seat in each of said predetermined recesses; a valve member in each of said predetermined recesses; said valve member being of a thin resilient material and having a portion normally spaced from said valve seat means and supported in said spaced position by said resilience to permit the flow of air from said recess to said chamber; the resilient support of said portion being overcome and said portion

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  • Load-Engaging Elements For Cranes (AREA)
US3598439D 1968-12-06 1968-12-06 Lifting heads for palletizers Expired - Lifetime US3598439A (en)

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US78182368A 1968-12-06 1968-12-06

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US (1) US3598439A (enrdf_load_stackoverflow)
CA (1) CA927439A (enrdf_load_stackoverflow)
ES (1) ES373940A1 (enrdf_load_stackoverflow)
FR (1) FR2025500B1 (enrdf_load_stackoverflow)
GB (1) GB1226302A (enrdf_load_stackoverflow)

Cited By (10)

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US3697112A (en) * 1971-04-15 1972-10-10 Eaton Yale & Towne Vacuum pick up head
US3809265A (en) * 1971-12-13 1974-05-07 Baker Perkins Inc Bakery product depanning apparatus
US3910621A (en) * 1973-01-23 1975-10-07 Go Con Concrete Ltd Suction devices
US3926466A (en) * 1973-10-01 1975-12-16 Ethyl Corp Apparatus for handling rolls
US5149162A (en) * 1989-08-08 1992-09-22 Focke & Co. (Gmbh & Co.) Device for conveying layers comprising a multitude of individual objects
US5464263A (en) * 1994-08-17 1995-11-07 Nishiguchi Hidetsugu Vacuum adsorber
AU698812B2 (en) * 1994-05-09 1998-11-05 Autocast Inventions Limited An apparatus incorporating a grid element for assisting in the stacking and destacking of products from a surface
US6802688B1 (en) 1999-04-27 2004-10-12 Univeyor A/S Apparatus for handling layers of palletized goods
US20050160758A1 (en) * 2004-01-23 2005-07-28 Foresman James D. Annular cooler pallet construction
CN117585476A (zh) * 2024-01-19 2024-02-23 中储粮成都储藏研究院有限公司 一种粮食入仓自动对准窗户的方法及系统

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Publication number Priority date Publication date Assignee Title
FR2495592A1 (fr) * 1980-12-05 1982-06-11 Joulin Sema Dispositif de prehension fonctionnant par succion
GB2259079A (en) * 1991-08-03 1993-03-03 Paul Anthony Conway Paving stone manipulator
IE66375B1 (en) * 1991-11-27 1995-12-27 Autocast Alarms Ltd A lifting apparatus
GB2355447A (en) * 1999-10-23 2001-04-25 Mannesmann Dematic Ltd Goods handling device comprising suction lifting head

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US2715038A (en) * 1954-05-28 1955-08-09 Vacuum Concrete Inc Vacuum handling apparatus
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US2960364A (en) * 1957-11-12 1960-11-15 Lever Brothers Ltd Conveyor device
US2970608A (en) * 1958-06-25 1961-02-07 American Motors Corp Refrigerating apparatus
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US2208605A (en) * 1936-09-17 1940-07-23 Bowling Patents Man Corp Bowling pin setting apparatus
GB541721A (en) * 1940-06-06 1941-12-09 Frank Sylvester Pedder Improvements in or relating to valves
US2599499A (en) * 1945-02-16 1952-06-03 Goetaverken Ab Spring plate valve
US2694337A (en) * 1951-07-31 1954-11-16 Powers Chemco Inc Flexible sheet support for cameras
US2715038A (en) * 1954-05-28 1955-08-09 Vacuum Concrete Inc Vacuum handling apparatus
US2841433A (en) * 1956-06-22 1958-07-01 Ballantine & Sons P Apparatus for handling materials
US2880030A (en) * 1956-06-22 1959-03-31 Ballantine & Sons P Apparatus for handling materials
US2960364A (en) * 1957-11-12 1960-11-15 Lever Brothers Ltd Conveyor device
US2970608A (en) * 1958-06-25 1961-02-07 American Motors Corp Refrigerating apparatus
US3057373A (en) * 1959-10-19 1962-10-09 Parker Hannifin Corp Flow limiting valve
US3307819A (en) * 1965-04-12 1967-03-07 Cocito Joe Michael Disc valve for vacuum board

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697112A (en) * 1971-04-15 1972-10-10 Eaton Yale & Towne Vacuum pick up head
US3809265A (en) * 1971-12-13 1974-05-07 Baker Perkins Inc Bakery product depanning apparatus
US3910621A (en) * 1973-01-23 1975-10-07 Go Con Concrete Ltd Suction devices
US3926466A (en) * 1973-10-01 1975-12-16 Ethyl Corp Apparatus for handling rolls
US5149162A (en) * 1989-08-08 1992-09-22 Focke & Co. (Gmbh & Co.) Device for conveying layers comprising a multitude of individual objects
AU698812B2 (en) * 1994-05-09 1998-11-05 Autocast Inventions Limited An apparatus incorporating a grid element for assisting in the stacking and destacking of products from a surface
US5464263A (en) * 1994-08-17 1995-11-07 Nishiguchi Hidetsugu Vacuum adsorber
US6802688B1 (en) 1999-04-27 2004-10-12 Univeyor A/S Apparatus for handling layers of palletized goods
US20050160758A1 (en) * 2004-01-23 2005-07-28 Foresman James D. Annular cooler pallet construction
US7093457B2 (en) * 2004-01-23 2006-08-22 Metso Minerals Industries, Inc. Annular cooler pallet construction
CN117585476A (zh) * 2024-01-19 2024-02-23 中储粮成都储藏研究院有限公司 一种粮食入仓自动对准窗户的方法及系统
CN117585476B (zh) * 2024-01-19 2024-04-16 中储粮成都储藏研究院有限公司 一种粮食入仓自动对准窗户的方法及系统

Also Published As

Publication number Publication date
ES373940A1 (es) 1972-03-16
FR2025500A1 (enrdf_load_stackoverflow) 1970-09-11
FR2025500B1 (enrdf_load_stackoverflow) 1975-01-10
GB1226302A (enrdf_load_stackoverflow) 1971-03-24
CA927439A (en) 1973-05-29

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