US3747784A - Material handling system - Google Patents

Material handling system Download PDF

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Publication number
US3747784A
US3747784A US00234534A US3747784DA US3747784A US 3747784 A US3747784 A US 3747784A US 00234534 A US00234534 A US 00234534A US 3747784D A US3747784D A US 3747784DA US 3747784 A US3747784 A US 3747784A
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US
United States
Prior art keywords
pivot
sheet material
chamber
head
plate
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
US00234534A
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English (en)
Inventor
G Dean
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dean Research Corp
Original Assignee
Dean Research Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dean Research Corp filed Critical Dean Research Corp
Application granted granted Critical
Publication of US3747784A publication Critical patent/US3747784A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • B66C1/0256—Operating and control 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
    • B66C1/0293—Single lifting units; Only one suction cup
    • 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
    • B66C1/10—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 mechanical means
    • B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
    • B66C1/44—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces
    • B66C1/445—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces motor actuated
    • B66C1/447—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces motor actuated by hydraulic or pneumatic motors

Definitions

  • ABSTRACT An improved material handling system is provided in which a head adapted to lift one or more sheets of material is provided with a pair of plates for engaging both sides of the stack of material to be lifted. One of the plates is movable about a pivot to engage one side of the stack. Means for applying positive pressure to the movable plate on one side of the pivot is provided along with means for applying negative pressure between the plates on the other side of the pivot to both clamp and lift the stacked material.
  • This invention relates to improvements in material handling systems, and more particularly to improvements in those systems requiring the lifting of a stack of sheet material for transport between a first and second point.
  • the material handling head is provided with a movable plate mounted on a pivot which traverses the length of the head.
  • the pivot is located within the head such that two chambers are formed, one above the pivot and one below.
  • the sheet material is clamped between the lower section of the plate below the pivot and a second plate, preferably stationary. Vacuum is applied to the chamber defined by the pivot, the two plates and two end plates to maintain the stack of sheet material within the head.
  • Means for providing a pressure force is mounted on said head to pressurize the chamber above the pivot to force the movable plate tightly against the stack of sheet material to increase the lifting capability of the entire material handling head.
  • FIG. 1 is a side view in partial section of the material handling head
  • FIG. 2 is a front view in partial section of the material handling head taken along line 2--2 of FIG. I;
  • FIG. 3 is a side detail view of the material handling head of FIG. I.
  • the material handling head 10 is formed of a back plate 12, a top plate 14, and a front plate 16. The ends of the material handling head are sealed by a pair of end plates 18 on which seals 20 are mounted. Seals 20 are adapted to engage the top of a stack of sheet material shown at 22 in the drawing, as will be explained below.
  • pivot 24 which runs the entire length of the back plate 12.
  • a movable plate generally denoted by the numeral 26, having a leg 28 located above the pivot and a leg 30 located below the pivot.
  • the end of leg 28 is formed with a recess 32 running the entire length of the leg 28 and in which is mounted a wiping seal 34.
  • Top plate 14 is formed with a curved surface as shown at 36 to provide continuous contact between wiping seal 34 and the curved surface 36 during pivotal motion of plate 26 about pivot 24.
  • Pivot 24 is in sealing contact with end plates 18. Such sealing contact may be achieved by mounting rubber stops (not shown) at each end of the pivot to prevent leakage of air from the region above to the region below the pivot.
  • Plate 14 is provided with a bore 38 which extends into chamber 40 defined by curved surface 36, leg 28 and the interior surface 42 of back plate 12.
  • Conventional means (not shown) for applying gas under pressure such as an air pump, is provided through tubing 44 to apply pressure to chamber 40.
  • Back plate 12 is provided with a bore 46 extending :into chamber 52 defined by rear surface portion 48 of back plate 12, pivot 24 and leg 30 of movable plate 26.
  • a conventional vacuum pump (not shown) is mounted via tubing 50 to supply vacuum to the chamber 52..
  • plate 26 is easily movable about pivot 24 to permit leg 30 to be pivoted away from rear surface 48.
  • the material handling head 10 is then moved downwardly over the stack of sheet material 22, the said stack being positioned between leg 30 and rear surface 48.
  • the material handling head is moved downwardly until end seals 20 contact the upper surface of the stack to be moved.
  • positive gas pressure is applied via tubing 44 and bore 38 to pressurize chamber 40.
  • Pressurizing chamber 40 causes plate 26 to pivot about pivot 24 to move leg 30 against the side of the stack to be lifted.
  • the pressure exerted by leg 30 at this point is determined solely by the pressure force existing on the leg 28.
  • a vacuum force is applied via tubing 50 and bore 46 to evacuate chamber 52.
  • chamber 52 provides additional force for retaining the stack of material in position for lifting.
  • plate 26 may be provided with sealing strips along the edges of the plate which contact the end plates 18 to mini mize leakage between the two chambers and to aid in controlling the applied pressure and/or vacuum forces.
  • Prior apparatus have depended solely on the vacuum force for lift capability.
  • positive clamping pressure as described herein, additional lifting capability is imparted to the material handling head to enable it to handle larger gross weights of stacked material, a tremendous advantage when large stacks have to be moved from one section of a plant to another.
  • the entire material handling head can be mounted on overhead rails as described in U.S. Pat. No. 3,411,641, for movement within a plant in a manner defined by the number and placement of the rails.
  • the material handling head of this invention can be mounted on a conventional crane for use outside of a building to lend an additional lifting and moving capability to the loading and unloading of stacks of sheet material from vehicles or from outside storage depots.
  • the pressure pump connected through tubing 44 can be a two-sided pump having both pressure and vacuum connections which may be connected to tubing 44 through a conventional reversing valve well known to the art.
  • a conventional reversing valve By controlling the reversing valve, either vacuum or positive pressure can be applied to chamber 40 to control movement of plate 26. For instance, when a large stack is to be engaged, negative pressure may be up plied to chamber 40 to move leg 30 outwardly to permit engagement of the stack, whereupon positive pressure is then employed to clamp the stack.
  • a seal 54 of rubber or some other type of resilient material is provided along the entire length of leg 30.
  • Seal material 56 also resilient, may be placed on rear surface 48 of back plate 12 so that material gripped between the seals 54 and 56 will be gripped in a manner such that the vacuum induced in chamber 52 will not be lost due to poor sealing between leg 30, the stack, and rear surface 48.
  • a sealing cap 58 may be provided to positively prevent leakage between compartments 40 and 52.
  • a material handling head for lifting sheet material comprising a back plate, a top plate and a pair of end plates, a pivot mounted on said back plate, said pivot traversing the entire length of said back plate, a movable plate mounted on said pivot, said movable plate having a first leg extending above said pivot toward said top plate to define a first chamber comprising said end plates, top plate, back plate and pivot, and a second leg extending below said pivot to define a second chamber comprising said end plates, back plate, pivot and the said sheet material, means for applying gas under pressure to said first chamber to urge the movable plate to rotate about said pivot to bring the said second leg into contact with said sheet material, and means to apply a vacuum force to said second chamber to provide additional force to maintain said sheet material within the material handling head when said head is moved.
  • the material handling head according to claim 1 further comprising means for sealing said first chamber against pressure leakage.
  • the sealing means comprises a wiper seal, a recess in said first leg for receiving said wiper seal, said top being curved adjacent said first leg such that the said wiper seal remains in wiping contact with said top plate during movement of said movable plate.
  • the material handling head according to claim 2 further comprising a pair of end seals, said end seals being placed on said end plates such that said end seals contact said sheet material when the head is moved into position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
US00234534A 1972-03-14 1972-03-14 Material handling system Expired - Lifetime US3747784A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23453472A 1972-03-14 1972-03-14

Publications (1)

Publication Number Publication Date
US3747784A true US3747784A (en) 1973-07-24

Family

ID=22881769

Family Applications (1)

Application Number Title Priority Date Filing Date
US00234534A Expired - Lifetime US3747784A (en) 1972-03-14 1972-03-14 Material handling system

Country Status (4)

Country Link
US (1) US3747784A (US20080293856A1-20081127-C00127.png)
JP (1) JPS5030355B2 (US20080293856A1-20081127-C00127.png)
DE (1) DE2312689A1 (US20080293856A1-20081127-C00127.png)
GB (1) GB1418424A (US20080293856A1-20081127-C00127.png)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286540A (en) * 1978-04-04 1981-09-01 Georg Fischer Brugg-Oehler Ag Apparatus for strengthening porous plates by impregnation
FR2579190A1 (fr) * 1985-03-21 1986-09-26 Thibault Jacques Dispositif de levage de charges en couches formees d'objets independants les uns des autres et disposes cote a cote
US4923363A (en) * 1989-08-31 1990-05-08 Owens-Illinois Glass Container Inc. Lehr loader pickup arm
US5727832A (en) * 1995-12-12 1998-03-17 Abb Flexible Automation, Inc. End effector for transferring articles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286540A (en) * 1978-04-04 1981-09-01 Georg Fischer Brugg-Oehler Ag Apparatus for strengthening porous plates by impregnation
FR2579190A1 (fr) * 1985-03-21 1986-09-26 Thibault Jacques Dispositif de levage de charges en couches formees d'objets independants les uns des autres et disposes cote a cote
US4923363A (en) * 1989-08-31 1990-05-08 Owens-Illinois Glass Container Inc. Lehr loader pickup arm
US5727832A (en) * 1995-12-12 1998-03-17 Abb Flexible Automation, Inc. End effector for transferring articles

Also Published As

Publication number Publication date
JPS49974A (US20080293856A1-20081127-C00127.png) 1974-01-07
JPS5030355B2 (US20080293856A1-20081127-C00127.png) 1975-09-30
GB1418424A (en) 1975-12-17
DE2312689A1 (de) 1973-10-11

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