US3791529A - Crane-type stacker - Google Patents

Crane-type stacker Download PDF

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US3791529A
US3791529A US00192579A US3791529DA US3791529A US 3791529 A US3791529 A US 3791529A US 00192579 A US00192579 A US 00192579A US 3791529D A US3791529D A US 3791529DA US 3791529 A US3791529 A US 3791529A
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members
mast sections
mast
abutment means
movement
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US00192579A
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R Thomas
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SN OPERATING Co Inc
Mc Neil Corp
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McNeil Corp
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Assigned to SHEPARD NILES, INC. reassignment SHEPARD NILES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SHEPARD NILES CRANE & HOIST CORPORATION
Assigned to S.N. OPERATING CO., INC. reassignment S.N. OPERATING CO., INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SHEPARD NILES INC.
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Assigned to UNIBANK PLC reassignment UNIBANK PLC SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CONNER, HERBERT T., NELSON, LAWRENCE L., SHEPARD NILES INC.
Assigned to UNIBANK PLC, A CORPORATION OF THE UNITED KINGDOM reassignment UNIBANK PLC, A CORPORATION OF THE UNITED KINGDOM SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHEPARD NILES INC., A NY CORPORATION
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/07—Floor-to-roof stacking devices, e.g. "stacker cranes", "retrievers"

Definitions

  • ABSTRACT A material handling apparatus comprising a telescopic mast secured at its upper end to a movable overhead support and having a load carriage vertically movable along the lower movable mast section and interengaging means between the load carriage and the mast preventing movement of the load carriage upwardly along the lower mast section until the load carriage is raised to a position adjacent to or above the lower end of the upper fixed mast section.
  • the invention relates to material handling apparatus having a vertical mast assembly supported by and extending downwardly from an overhead movable support, an elevatable load carriage guided for vertical movement by and along a vertically movable lower section of the mast assembly, and power-actuated means for raising and lowering the load carriage and wherein the lower mast section may be raised relative to the fixed mast section to provide additional head room or floor clearance to permit the crane to be readily moved about a work area or to facilitate its movement thereabove.
  • Prior Art Overhead material handling apparatus of the traveling crane-type including a trolley supported on a movable bridge and having a downwardlyextending telescopic mast along which a power-operated elevatable load carriage isguided for vertical movement and including supplemental means for raising the lower mast section.
  • Apparatus of this type is shown in United States Cotesworth et al. Pat. No. 2,947,426, issued Aug. 2, 1960.
  • the present invention provides material handling apparatus, particularly of the so-called stacker crane type, including a vertically extending telescopic mast assembly having its upper end connected to an overhead support and comprising three or more members .guided for vertical movement by and along another.
  • FIG. 1 is a fragmentary vertical view of a. material handling apparatus embodying the present invention and having its upper end connected to an overhead movable support;
  • FIG. 2 is an enlarged fragmentary view on the line 22 of FIG. 1.
  • the crane A comprises a bridge 16 including girders 18, 20 that extend transversely of the rails 12, 14 and end trucks 22', 24 connected to the opposite ends of the girders.
  • the end trucks include wheels which ride on the tread portions of the rails 12, 14 and support the traveling crane for movement along the crane runway.
  • a carrier or trolley B is supported on horizontal flange portions or treads of the girders 18, 20 for movement therealong.
  • the trolley B includes a frame portion 28 and pairs of wheeled trucks 30 and 32 which support the opposite ends of the frame portion 28 and which ride on the bottom horizontal flanges of the girders 18, 20.
  • Each of the end trucks 30 is provided with a reversible electric motor 34 for driving the wheels thereof to move the trolley along the crane bridge in a conventional manner.
  • the trolley B includes an elevatable load carriage D guided and supported in its vertical movement by a vertical mast assembly C dependingly supported from the frame portion 28 of the trolleyB by a trunnion pin 44.
  • the trunnion pin 44 is supported by a suitable thrust bearing carried by a support member 46 mounted between transverse frame members 48, 49 of the trolley frame.
  • the trunnion pin 44 passes through a bull gear 50 fixed to the upper end of the mast assembly and a member 52 below and in engagement with the underside of the bull gear.
  • the member 52 is held in engagement with the bull gear by a nut 54 on the lower end of the pin 44.
  • the trolley frame is provided with rollers 56 which engage the upper side of the bull gear and functions to stabilize the mast assembly.
  • the mast assembly in the illustrated embodiment is rotated by a reversible electric motor 60 carried by thetrolley frame and operatively connected to the mast assembly to rotate the latter through a pinion gear 62 in mesh with the bull gear 50.
  • the mast assembly B comprises a primary or upper mast section formed by spaced vertically extending channel members 72, 74 and a secondary or lower mast section 76 adapted to telescope over the primary mast section 70 and including spaced vertically extending channel members 80, 82.
  • the members 80, 82 are disposed adjacent. the opposite sides of the primary mast section outwardly of the members 72, 74, respectively.
  • Each of the members 80, 82 carries pairs of wheels 84, 86 which engage opposite side walls of the channel in the adjacent one 'of the members 72, 74 to guide the secondary'inast section in its movement along the primary mast section.
  • the vertical spacing of the wheels 84,86 prevents rocking movement of the secondary mast section '76 about a horizontal axis When the latter is extended to form an extension of the primary mast section.
  • the channel members 80, 82 like the members 72, 74', face or open outwardly and the side walls of the channels therein are engaged by pairs of vertically spaced wheels 90, 92 carried on the load carriage D to guide the carriage in itsmovement along the secondary mast section 76.
  • the load carriage includes a frame 94 extending transversely of the mast assembly and a pair of load engaging fork members 96, 98 carried by the transfer frame.
  • the fork members are preferably detachably connected to the carriage frame and are preferably adjustable toward and away from each other to vary the spacing between the fork members.
  • the load carriage D is raised and lowered by operation of a reversible electric hoist motor 100 supported at the upper end of the primary mast section 70 and connected by suitable gearing to a shaft 102 extending transversely of the primary mast section.
  • the shaft 102 carries sprockets 104, 106 and the load carriage is suspended by flexible members or chains 108, 110 secured at their one ends to the primary mast and trained over the sprockets 104, 106, respectively, and connected at their other ends to the load carriage D.
  • Rotation of the motor 100 will either raise or lower the load carriage, depending upon its direction of rotation.
  • the portions of the chains 108, 1 between the sprockets and the primary mast section are relatively straight and when the load carriage is raised, these portions of the chains form loops between the primary mast channels 72, 74.
  • the condition of one of the chains is utilized to actuate a limit switch for stopping the motor 100 when the load carriage obtains its lowermost position.
  • the uppermost position of the load carriage is determined by a limit switch mounted adjacent the upper end of the secondary mast section 70 actuated by the load carriage when the latter is moved to a position adjacent to the upper end of the mast assembly to stop the elevating operation of the motor 100.
  • the actuation of the motors 34 and 110 are controlled from a pendant control station P suspended from the trolley 26 by a flexible cable 112.
  • the secondary mast section 76 is raised along with the load carriage by the engagement of two rollers 120, 122 on the load carriage with the lower ends of vertically extending bar-like members 124, 126, respectively, forming a part of the secondary mast section 76.
  • the rollers 120, 122 are carried by brackets 130, 132, respectively, on the upper part of the frame 94 of the load carriage and spaced outwardly from opposite sides of the secondary mast section.
  • the bar-like members 124, 126 are located outwardly and in alignment with the front or near flanges or sides 134, 136 of the channel members 80, 82, respectively, of the auxiliary mast section, as viewed in FIG.
  • the link members 137, 138 normally extend horizontally.
  • the members 140, 142 are in the form of hell crank levers pivoted at the apex of their respective angle members or arms to the flanges 134, 136 of the channel members 80, 82, respectively, with one arm of each lever normally extending horizontally and pivoted to the bar members 124, 126, respectively.
  • the other arms of the members 140, 142 extend vertically and carry small rollers 144, 146, respectively, rotatably connected thereto.
  • the rollers 144, 146 engage and roll along the outer edges ofthe front or near flanges or sides 147, 148 of the channel members 72, 74 of the main mast section, as viewed in FIG. 2, as the secondary mast section 76 moves upwardly over or along the primary mast section 70 upon elevation of the load carriage D and secondary mast section.
  • the rollers 144, 146 approach cut-out sections or cam recesses 150, 151 in the projecting sides of the flanges 147, 148 of the channel members 72, 74 of the primary mast section.
  • the rollers 144, 146 drop into the recesses or apertures 150, 151 allowing the bar-like members 124, 126 to move upwardly and inwardly relative to the channel members 80, 82 of the secondary mast section sufficient to clear the rollers 120, 122.
  • the load carriage D thereafter moves upwardly along the lower mast section 76 with the rollers 120, 122 rolling along the outer sides or edges of the members 124, 126.
  • the load carriage moves upwardly past the lower ends of the members 124, 126-which are now so positioned that they do not engage but clear the load carriage.
  • the load carriage D can be elevated to a position closely adjacent to the underside of the frame 28 of the trolley B.
  • the load carriage As the load carriage is lowered from its upper position it moves downwardly along the secondary mast section 76 which is retained in its up position by the engagement of the rollers 144, 146 in the cut-out section 150, 151, of the primary mast section with the rollers 120, 122 rolling along the outer edges of the bar-like members 124, 126.
  • the rollers 120, 122 roll off of the bar-Iike members 124, 126 allowing the members to move downwardly and outwardly to a position in which they rest upon the rollers 120, 122, respectively.
  • Continued downward movement of the load carriage is accomplished by downward movement of the secondary mast section 76.
  • the mast sections may be of any desired length and whether or not the lower end of the secondary mast section will be raised up to or beyond the lower end of the primary mast section or allowed to stop at some position below the lower end of the primary mast section will be a function of the relative lengths of the mast sections and the vertical position of the recesses 150, 151, etc.
  • the members 140, 142 and their associated rollers may be replaced by members fixed to the members 124, 126 and normally abutting against the primary mast section, which members would drop into an aperture long enough to permit required vertical movement of the members 124, 126.
  • the members 124, 126 or equivalents thereof could be fixed to the load carriage with the projecting arms of the members 140, 142 arranged to engage the upper end thereof and subsequently slide along the inner sides of the members upon the lower mast section reaching a predetermined raised position.
  • the mast could be fixed to the trolley rather than being rotatably connected to it, have its upper end connected to some suitable means of support other than a trolley movable along a crane bridge, comprise mast sections of any suitable relative lengths, and/or more than two mast sections with the hoist means connected to one rather than to the load carriage, etc. It is the intention to hereby cover all adaptations, modifications and use of the invention disclosed coming within the practice of those skilled in the art to which the invention relates and the scope of the appended claims.
  • a vertical telescopic mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members other of said members.
  • a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means on said third member, a fourth member pivotally connected to said one of said members by spaced links and having its lower end engageable with said abutment means on said third member, a second abutment means connected to said fourth member engageable with and movable along said other of said members, an aperture in said other of said members in the path of movement of said second abutment means along said other of said members whereby said fourth member will disengage said first abutment means upon said second abutment means engaging in said aperture.
  • a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting one'of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means on said third member, a fourth member pivotally connected to said one of said members by spaced links and having its lower end engageable with said abutment means on said third member, a second abutment means connected to said fourth member engageable with and movable along said other of said members, an aperture in said other of said members in the path of movement of said second abutment means along said other of said members, and means for limiting movement of said one of said members along said other of said members upon said second abutment means engaging in said aperture.
  • a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means on said third member, a bell crank lever pivotally connected to said one of said members and having one arm connected to said first abutment means, second abutment means on the other arm of said bell crank lever engageable with and movable along said other of said members, an aperture in 7 said other of said members in the path of movement of said second abutment means along said other of said members whereby said bell crank lever will be disconnected from said first abutment means and movement of said one of said members along said other of said members will be limited upon said second abutment means engaging in said aperture.
  • a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting. one of said members to another of said members for movement therealong, a third memberfmeans for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means onsaid third member, a fourth member pivotally connected to said one of said members by spaced links and having its lower end engageable with said abutment means on said third member, a bell crank lever pivotally connected to said one of said members and having one arm connected to said fourth member, second abutment means on the other,
  • a vertical telescopic mast assembly comprising a plurality of relatively movable mast sections, means connecting the upper end of one of said mast sections to said overhead support, means operatively connecting another of said mast sections to said one of said mast sections for movement therealong between a first position in which its lower end is below the lower end of said one of said mast sections and a second position above the first position, a load carriage, means for connecting said load carriage to said another of said mast sections for movement therealong between positions adjacent to the lower and upper ends of said an-' other of said mast sections, means connected between said one mast section and said load carriage for raising and lowering said load carriage and contracting and extending said mast, and means preventing movement of said loadcarriage along said another of said mast sections unless said other of said mast sections is in awedetermined .raised position along said one of said mast sections.
  • a vertical mast assembly comprising a plurality of relatively movable mast sections, means connecting the upper end of one of said mast sections to said overhead support, means operatively connecting another of said mast sections to said one of said mast sections for movement therealong between a position in which its lower end is below the lower end of said one of said mast sections and a position in which its upper end is adjacent to the upper end of said one of said mast sections, a load carriage, means for connecting said load carriage to said another of said mast sections for movement therealong between positions adjacent to opposite ends of said another of said mast sections, means for raising said load carriage from a position adjacent to the lower end of said another of said mast sections to a position adjacent to the upper end of said one of said mast sections, abutment means on said load carriage and said another of said mast sections for moving said another of said mast sections with said load carriage, and means disengaging said abutment means and limiting downward movement of said other of said mast sections along said onevof said mast sections when the upper
  • a vertical mast assembly comprising a plurality of relatively movable mast sections, means connecting the upper end of one of said mast sections to said overhead support, means operatively connecting another of said mast sections to said one of said mast sections for movement relative thereto between a position in which its lower end is below the lower end of said one of said mast sections and a position in which its upper end is adjacent to the upper end of said one of said mast sections, a load carriage, means for connecting said load carriage to said another of said mast sections for movement therealong between positions adjacent to opposite ends of said another of said mast sections, power means at the upper end of said other of said mast sections connected by a flexible means to said load carriage for raising said load carriage, first abutment means on said load carriage, a member pivotally connected to said other of said mast sections by spaced links and having its lower end engageable with said abutment means on said load carriage, a bell crank lever pivotally connected to said other of said mast sections and having one arm connected to said member, second

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

A material handling apparatus comprising a telescopic mast secured at its upper end to a movable overhead support and having a load carriage vertically movable along the lower movable mast section and interengaging means between the load carriage and the mast preventing movement of the load carriage upwardly along the lower mast section until the load carriage is raised to a position adjacent to or above the lower end of the upper fixed mast section.

Description

United States Patent [191 Thomas [451 Feb. 12, 1974 CRANE-TYPE STACKER Roger V. Thomas, Willoughby Hills, Ohio [73] Assignee: McNeil Corporation, Akron, Ohio [22] Filed: Oct. 26, 1971 [21] Appl. No.: 192,579
Related US. Application Data [63] Continuation of Ser No. 9,637, Feb. 9, 1970,
[75] lnventor:
abandoned.
[ 52] US. Cl. 212/124, 214/16.4
[51] Int. Cl. B66c 19/00 [58] Field of Search 212/124-130; 187/9; 214/164, 42
[56] References Cited UNITED STATES PATENTS 3,250,182 5/1966 Nansel 212/55 8/1965 Dolphin 187/9 5/1962 Baumann 187/9 Primary ExaminerRichard A. Schacher Assistant ExaminerGene A. Church Attorney, Agent, or Firm-Wa'tts, Hoffmann, Fisher & Heinke [57] ABSTRACT A material handling apparatus comprising a telescopic mast secured at its upper end to a movable overhead support and having a load carriage vertically movable along the lower movable mast section and interengaging means between the load carriage and the mast preventing movement of the load carriage upwardly along the lower mast section until the load carriage is raised to a position adjacent to or above the lower end of the upper fixed mast section.
8 Claims, Drawing Figures PATENIEB 3,791 ,529
sum 1 or 2- Fig. I.
INVENTOR ROGER V. THOMAS Wm, M 41 ATTO/ZNE Y5.
CRANE-TYPE STACKER This is a continuation of application Ser. No. 9,637,
filed Feb. 9, 1970, now abandoned.
1. Field of the Invention The invention relates to material handling apparatus having a vertical mast assembly supported by and extending downwardly from an overhead movable support, an elevatable load carriage guided for vertical movement by and along a vertically movable lower section of the mast assembly, and power-actuated means for raising and lowering the load carriage and wherein the lower mast section may be raised relative to the fixed mast section to provide additional head room or floor clearance to permit the crane to be readily moved about a work area or to facilitate its movement thereabove.
2. Prior Art Overhead material handling apparatus of the traveling crane-type is known, including a trolley supported on a movable bridge and having a downwardlyextending telescopic mast along which a power-operated elevatable load carriage isguided for vertical movement and including supplemental means for raising the lower mast section. Apparatus of this type is shown in United States Cotesworth et al. Pat. No. 2,947,426, issued Aug. 2, 1960.
SUMMARY OF INVENTION The present invention provides material handling apparatus, particularly of the so-called stacker crane type, including a vertically extending telescopic mast assembly having its upper end connected to an overhead support and comprising three or more members .guided for vertical movement by and along another. At
least two of said members-being mast sections and another a load carriage. Power means for raising one of the members and an operative connection between the one member and the member along which it-moves for preventing such movement until the one member is raised a predetermined distance and thereafter permitting such movement.
DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary vertical view of a. material handling apparatus embodying the present invention and having its upper end connected to an overhead movable support; and
FIG. 2 is an enlarged fragmentary view on the line 22 of FIG. 1.
DESCRIPTION OF PREFERRED EMBODIMENT While the present invention is susceptible of embodiment in various devices, it is herein shown as embodied in a bridge-type overhead traveling crane A supported by and movable along spaced runway rails 12,14.
The crane A comprises a bridge 16 including girders 18, 20 that extend transversely of the rails 12, 14 and end trucks 22', 24 connected to the opposite ends of the girders. The end trucks include wheels which ride on the tread portions of the rails 12, 14 and support the traveling crane for movement along the crane runway.
A carrier or trolley B is supported on horizontal flange portions or treads of the girders 18, 20 for movement therealong. The trolley B includes a frame portion 28 and pairs of wheeled trucks 30 and 32 which support the opposite ends of the frame portion 28 and which ride on the bottom horizontal flanges of the girders 18, 20. Each of the end trucks 30 is provided with a reversible electric motor 34 for driving the wheels thereof to move the trolley along the crane bridge in a conventional manner.
The trolley B includes an elevatable load carriage D guided and supported in its vertical movement by a vertical mast assembly C dependingly supported from the frame portion 28 of the trolleyB by a trunnion pin 44. The trunnion pin 44 is supported by a suitable thrust bearing carried by a support member 46 mounted between transverse frame members 48, 49 of the trolley frame. The trunnion pin 44 passes through a bull gear 50 fixed to the upper end of the mast assembly and a member 52 below and in engagement with the underside of the bull gear. The member 52 is held in engagement with the bull gear by a nut 54 on the lower end of the pin 44. The trolley frame is provided with rollers 56 which engage the upper side of the bull gear and functions to stabilize the mast assembly. The mast assembly in the illustrated embodiment is rotated by a reversible electric motor 60 carried by thetrolley frame and operatively connected to the mast assembly to rotate the latter through a pinion gear 62 in mesh with the bull gear 50. 1
The structure thus far described is of conventional construction and has, therefore, not been described in detail, it being understood that other suitable structure may be utilized as a mast, for supporting the mast for movement overhead, and that the mast need not be rotatable about a vertical axis. Y
The mast assembly B, shown, comprises a primary or upper mast section formed by spaced vertically extending channel members 72, 74 and a secondary or lower mast section 76 adapted to telescope over the primary mast section 70 and including spaced vertically extending channel members 80, 82. The members 80, 82 are disposed adjacent. the opposite sides of the primary mast section outwardly of the members 72, 74, respectively. Each of the members 80, 82 carries pairs of wheels 84, 86 which engage opposite side walls of the channel in the adjacent one 'of the members 72, 74 to guide the secondary'inast section in its movement along the primary mast section. The vertical spacing of the wheels 84,86 prevents rocking movement of the secondary mast section '76 about a horizontal axis When the latter is extended to form an extension of the primary mast section.
The channel members 80, 82, like the members 72, 74', face or open outwardly and the side walls of the channels therein are engaged by pairs of vertically spaced wheels 90, 92 carried on the load carriage D to guide the carriage in itsmovement along the secondary mast section 76. The load carriage includes a frame 94 extending transversely of the mast assembly and a pair of load engaging fork members 96, 98 carried by the transfer frame. The fork members are preferably detachably connected to the carriage frame and are preferably adjustable toward and away from each other to vary the spacing between the fork members.
The load carriage D is raised and lowered by operation of a reversible electric hoist motor 100 supported at the upper end of the primary mast section 70 and connected by suitable gearing to a shaft 102 extending transversely of the primary mast section. The shaft 102 carries sprockets 104, 106 and the load carriage is suspended by flexible members or chains 108, 110 secured at their one ends to the primary mast and trained over the sprockets 104, 106, respectively, and connected at their other ends to the load carriage D. Rotation of the motor 100 will either raise or lower the load carriage, depending upon its direction of rotation.
When the load carriage D-is in its lowermost position, the portions of the chains 108, 1 between the sprockets and the primary mast section are relatively straight and when the load carriage is raised, these portions of the chains form loops between the primary mast channels 72, 74. The condition of one of the chains is utilized to actuate a limit switch for stopping the motor 100 when the load carriage obtains its lowermost position. The uppermost position of the load carriage is determined by a limit switch mounted adjacent the upper end of the secondary mast section 70 actuated by the load carriage when the latter is moved to a position adjacent to the upper end of the mast assembly to stop the elevating operation of the motor 100. The actuation of the motors 34 and 110 are controlled from a pendant control station P suspended from the trolley 26 by a flexible cable 112.
As the load carriage D is elevated from a low position, for example, its lowermost position shown in FIG. 1, the secondary mast section 76 is raised along with the load carriage by the engagement of two rollers 120, 122 on the load carriage with the lower ends of vertically extending bar- like members 124, 126, respectively, forming a part of the secondary mast section 76. The rollers 120, 122 are carried by brackets 130, 132, respectively, on the upper part of the frame 94 of the load carriage and spaced outwardly from opposite sides of the secondary mast section. The bar- like members 124, 126 are located outwardly and in alignment with the front or near flanges or sides 134, 136 of the channel members 80, 82, respectively, of the auxiliary mast section, as viewed in FIG. 2, and are pivotally connected to the aforementioned flanges of the channel members 80, 82 by upper and lower pairs of link members 137, 138 and members 1411, 142 spaced downwardly from the upper ends of the bar members 124, 126, respectively. The link members 137, 138 normally extend horizontally. The members 140, 142 are in the form of hell crank levers pivoted at the apex of their respective angle members or arms to the flanges 134, 136 of the channel members 80, 82, respectively, with one arm of each lever normally extending horizontally and pivoted to the bar members 124, 126, respectively. The other arms of the members 140, 142 extend vertically and carry small rollers 144, 146, respectively, rotatably connected thereto.
The rollers 144, 146, engage and roll along the outer edges ofthe front or near flanges or sides 147, 148 of the channel members 72, 74 of the main mast section, as viewed in FIG. 2, as the secondary mast section 76 moves upwardly over or along the primary mast section 70 upon elevation of the load carriage D and secondary mast section. As the upper end of the secondary mast section 76 nears the upper end of the primary mast section 70 the rollers 144, 146 approach cut-out sections or cam recesses 150, 151 in the projecting sides of the flanges 147, 148 of the channel members 72, 74 of the primary mast section. As the secondary mast section 76 reaches its upper limit of travel along the primary mast section 170 the rollers 144, 146 drop into the recesses or apertures 150, 151 allowing the bar- like members 124, 126 to move upwardly and inwardly relative to the channel members 80, 82 of the secondary mast section sufficient to clear the rollers 120, 122. The load carriage D thereafter moves upwardly along the lower mast section 76 with the rollers 120, 122 rolling along the outer sides or edges of the members 124, 126. The load carriage moves upwardly past the lower ends of the members 124, 126-which are now so positioned that they do not engage but clear the load carriage.
One of the features of the present invention is the fact that the load carriage D can be elevated to a position closely adjacent to the underside of the frame 28 of the trolley B. As the load carriage is lowered from its upper position it moves downwardly along the secondary mast section 76 which is retained in its up position by the engagement of the rollers 144, 146 in the cut-out section 150, 151, of the primary mast section with the rollers 120, 122 rolling along the outer edges of the bar- like members 124, 126. As the load carriage Dreaches the lower end of the secondary mast section 76 the rollers 120, 122 roll off of the bar- Iike members 124, 126 allowing the members to move downwardly and outwardly to a position in which they rest upon the rollers 120, 122, respectively. Continued downward movement of the load carriage is accomplished by downward movement of the secondary mast section 76.
As will be understood by those skilled in the art to which the invention relates the foregoing description is that of the preferred embodiment and that the invention might be otherwise embodied. The mast sections may be of any desired length and whether or not the lower end of the secondary mast section will be raised up to or beyond the lower end of the primary mast section or allowed to stop at some position below the lower end of the primary mast section will be a function of the relative lengths of the mast sections and the vertical position of the recesses 150, 151, etc. The members 140, 142 and their associated rollers may be replaced by members fixed to the members 124, 126 and normally abutting against the primary mast section, which members would drop into an aperture long enough to permit required vertical movement of the members 124, 126. Alternatively, the members 124, 126 or equivalents thereof could be fixed to the load carriage with the projecting arms of the members 140, 142 arranged to engage the upper end thereof and subsequently slide along the inner sides of the members upon the lower mast section reaching a predetermined raised position.
As further altneratives to the construction shown, the mast could be fixed to the trolley rather than being rotatably connected to it, have its upper end connected to some suitable means of support other than a trolley movable along a crane bridge, comprise mast sections of any suitable relative lengths, and/or more than two mast sections with the hoist means connected to one rather than to the load carriage, etc. It is the intention to hereby cover all adaptations, modifications and use of the invention disclosed coming within the practice of those skilled in the art to which the invention relates and the scope of the appended claims.
Having thus described my invention, what I claim is:
1. In a material handling apparatus a vertical telescopic mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members other of said members.
2. In a material handling apparatus a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means on said third member, a fourth member pivotally connected to said one of said members by spaced links and having its lower end engageable with said abutment means on said third member, a second abutment means connected to said fourth member engageable with and movable along said other of said members, an aperture in said other of said members in the path of movement of said second abutment means along said other of said members whereby said fourth member will disengage said first abutment means upon said second abutment means engaging in said aperture. I
3. In a material handling apparatus a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting one'of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means on said third member, a fourth member pivotally connected to said one of said members by spaced links and having its lower end engageable with said abutment means on said third member, a second abutment means connected to said fourth member engageable with and movable along said other of said members, an aperture in said other of said members in the path of movement of said second abutment means along said other of said members, and means for limiting movement of said one of said members along said other of said members upon said second abutment means engaging in said aperture.
4. In a material handling apparatus a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means on said third member, a bell crank lever pivotally connected to said one of said members and having one arm connected to said first abutment means, second abutment means on the other arm of said bell crank lever engageable with and movable along said other of said members, an aperture in 7 said other of said members in the path of movement of said second abutment means along said other of said members whereby said bell crank lever will be disconnected from said first abutment means and movement of said one of said members along said other of said members will be limited upon said second abutment means engaging in said aperture.
5. In a material handling apparatus a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting. one of said members to another of said members for movement therealong, a third memberfmeans for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means onsaid third member, a fourth member pivotally connected to said one of said members by spaced links and having its lower end engageable with said abutment means on said third member, a bell crank lever pivotally connected to said one of said members and having one arm connected to said fourth member, second abutment means on the other,
arm of said bell crank lever engageable with and movable along said other of said members, an aperture in said other of said members in the path of movement of said second abutment means along said other of said members whereby said fourth member will disengage said first abutment means and movement of said one of said members along said other of said members will be limited upon said second abutment means engaging in said aperture.
6. In a material handling apparatus a movable overhead support, a vertical telescopic mast assembly comprising a plurality of relatively movable mast sections, means connecting the upper end of one of said mast sections to said overhead support, means operatively connecting another of said mast sections to said one of said mast sections for movement therealong between a first position in which its lower end is below the lower end of said one of said mast sections and a second position above the first position, a load carriage, means for connecting said load carriage to said another of said mast sections for movement therealong between positions adjacent to the lower and upper ends of said an-' other of said mast sections, means connected between said one mast section and said load carriage for raising and lowering said load carriage and contracting and extending said mast, and means preventing movement of said loadcarriage along said another of said mast sections unless said other of said mast sections is in awedetermined .raised position along said one of said mast sections.
7. In a material handling apparatus a movable overhead support, a vertical mast assembly comprising a plurality of relatively movable mast sections, means connecting the upper end of one of said mast sections to said overhead support, means operatively connecting another of said mast sections to said one of said mast sections for movement therealong between a position in which its lower end is below the lower end of said one of said mast sections and a position in which its upper end is adjacent to the upper end of said one of said mast sections, a load carriage, means for connecting said load carriage to said another of said mast sections for movement therealong between positions adjacent to opposite ends of said another of said mast sections, means for raising said load carriage from a position adjacent to the lower end of said another of said mast sections to a position adjacent to the upper end of said one of said mast sections, abutment means on said load carriage and said another of said mast sections for moving said another of said mast sections with said load carriage, and means disengaging said abutment means and limiting downward movement of said other of said mast sections along said onevof said mast sections when the upper end of said other of said mast sections reaches a position adjacent to the upper end of said one of said mast sections.
8. In a material handling apparatus a movable overhead support, a vertical mast assembly comprising a plurality of relatively movable mast sections, means connecting the upper end of one of said mast sections to said overhead support, means operatively connecting another of said mast sections to said one of said mast sections for movement relative thereto between a position in which its lower end is below the lower end of said one of said mast sections and a position in which its upper end is adjacent to the upper end of said one of said mast sections, a load carriage, means for connecting said load carriage to said another of said mast sections for movement therealong between positions adjacent to opposite ends of said another of said mast sections, power means at the upper end of said other of said mast sections connected by a flexible means to said load carriage for raising said load carriage, first abutment means on said load carriage, a member pivotally connected to said other of said mast sections by spaced links and having its lower end engageable with said abutment means on said load carriage, a bell crank lever pivotally connected to said other of said mast sections and having one arm connected to said member, second abutment means'on the other arm of said bell crank lever engageable with and movable along said one of said mast sections, an aperture in said one of said mast sections in the path of movement of said second abutment means along said one of said mast sections whereby said member will disengage said first abutment means and said other of said mast sections will be fixed to said one of said mast sections upon said second abutment means engaging in said aperture.

Claims (8)

1. In a material handling apparatus a vertical telescopic mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means connected between said another member and said third member for contracting said mast, means on said third member and said one of said members for limiting movement of said third member relative to said one of said members in an upwardly direction, means disengaging said means and limiting movement of said one of said members along said other of said members when said one of said members is in a predetermined position along said other of said members.
2. In a material handling apparatus a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means on said third member, a fourth member pivotally connected to said one of said members by spaced links and having its lower end engageable with said abutment means on said third member, a second abutment means connected to said fourth member engageable with and movable along said other of said members, an aperture in said other of said members in the path of movement of said second abutment means along said other of said members whereby said fourth member will disengage said first abutment means upon said second abutment means engaging in said aperture.
3. In a material handLing apparatus a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means on said third member, a fourth member pivotally connected to said one of said members by spaced links and having its lower end engageable with said abutment means on said third member, a second abutment means connected to said fourth member engageable with and movable along said other of said members, an aperture in said other of said members in the path of movement of said second abutment means along said other of said members, and means for limiting movement of said one of said members along said other of said members upon said second abutment means engaging in said aperture.
4. In a material handling apparatus a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means on said third member, a bell crank lever pivotally connected to said one of said members and having one arm connected to said first abutment means, second abutment means on the other arm of said bell crank lever engageable with and movable along said other of said members, an aperture in said other of said members in the path of movement of said second abutment means along said other of said members whereby said bell crank lever will be disconnected from said first abutment means and movement of said one of said members along said other of said members will be limited upon said second abutment means engaging in said aperture.
5. In a material handling apparatus a vertical mast assembly comprising a plurality of relatively movable members, means operatively connecting one of said members to another of said members for movement therealong, a third member, means for connecting said third member to said one of said members for movement therealong, means for raising said third member, first abutment means on said third member, a fourth member pivotally connected to said one of said members by spaced links and having its lower end engageable with said abutment means on said third member, a bell crank lever pivotally connected to said one of said members and having one arm connected to said fourth member, second abutment means on the other arm of said bell crank lever engageable with and movable along said other of said members, an aperture in said other of said members in the path of movement of said second abutment means along said other of said members whereby said fourth member will disengage said first abutment means and movement of said one of said members along said other of said members will be limited upon said second abutment means engaging in said aperture.
6. In a material handling apparatus a movable overhead support, a vertical telescopic mast assembly comprising a plurality of relatively movable mast sections, means connecting the upper end of one of said mast sections to said overhead support, means operatively connecting another of said mast sections to said one of said mast sections for movement therealong between a first position in which its lower end is below the lower end of said one of said mast sections and a second position above the first position, a load carriage, means for connecting said load carriage to said another of said mast sections for movement therealong between positions adjacent to the lower and upper ends of said another of said mast sections, means connected between said one mast section and said load carriage for raising and lowering said load carriage and contracting and extending said mast, and means preventing movement of said load carriage along said another of said mast sections unless said other of said mast sections is in a predetermined raised position along said one of said mast sections.
7. In a material handling apparatus a movable overhead support, a vertical mast assembly comprising a plurality of relatively movable mast sections, means connecting the upper end of one of said mast sections to said overhead support, means operatively connecting another of said mast sections to said one of said mast sections for movement therealong between a position in which its lower end is below the lower end of said one of said mast sections and a position in which its upper end is adjacent to the upper end of said one of said mast sections, a load carriage, means for connecting said load carriage to said another of said mast sections for movement therealong between positions adjacent to opposite ends of said another of said mast sections, means for raising said load carriage from a position adjacent to the lower end of said another of said mast sections to a position adjacent to the upper end of said one of said mast sections, abutment means on said load carriage and said another of said mast sections for moving said another of said mast sections with said load carriage, and means disengaging said abutment means and limiting downward movement of said other of said mast sections along said one of said mast sections when the upper end of said other of said mast sections reaches a position adjacent to the upper end of said one of said mast sections.
8. In a material handling apparatus a movable overhead support, a vertical mast assembly comprising a plurality of relatively movable mast sections, means connecting the upper end of one of said mast sections to said overhead support, means operatively connecting another of said mast sections to said one of said mast sections for movement relative thereto between a position in which its lower end is below the lower end of said one of said mast sections and a position in which its upper end is adjacent to the upper end of said one of said mast sections, a load carriage, means for connecting said load carriage to said another of said mast sections for movement therealong between positions adjacent to opposite ends of said another of said mast sections, power means at the upper end of said other of said mast sections connected by a flexible means to said load carriage for raising said load carriage, first abutment means on said load carriage, a member pivotally connected to said other of said mast sections by spaced links and having its lower end engageable with said abutment means on said load carriage, a bell crank lever pivotally connected to said other of said mast sections and having one arm connected to said member, second abutment means on the other arm of said bell crank lever engageable with and movable along said one of said mast sections, an aperture in said one of said mast sections in the path of movement of said second abutment means along said one of said mast sections whereby said member will disengage said first abutment means and said other of said mast sections will be fixed to said one of said mast sections upon said second abutment means engaging in said aperture.
US00192579A 1971-10-26 1971-10-26 Crane-type stacker Expired - Lifetime US3791529A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4316528A (en) * 1980-03-11 1982-02-23 Harnischfeger Corporation Mechanism for latchingly connecting telescoping members
FR2588843A1 (en) * 1985-10-18 1987-04-24 Hydro Materiels Installation for handling loads
US20050159220A1 (en) * 2003-12-15 2005-07-21 Gordon Wilson Method and interface system for facilitating access to fantasy sports leagues
US20150158670A1 (en) * 2012-09-04 2015-06-11 Murata Machinery, Ltd. Stacker crane

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Publication number Priority date Publication date Assignee Title
US3033392A (en) * 1960-03-21 1962-05-08 Western Electric Co Stock storage and selection system
US3202242A (en) * 1962-04-13 1965-08-24 Lansing Bagnall Ltd Industrial truck with an elevatable operator platform that is movable with and relative to the load handling means
US3250182A (en) * 1963-08-01 1966-05-10 Harold K Nansel Multiple extension apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033392A (en) * 1960-03-21 1962-05-08 Western Electric Co Stock storage and selection system
US3202242A (en) * 1962-04-13 1965-08-24 Lansing Bagnall Ltd Industrial truck with an elevatable operator platform that is movable with and relative to the load handling means
US3250182A (en) * 1963-08-01 1966-05-10 Harold K Nansel Multiple extension apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4316528A (en) * 1980-03-11 1982-02-23 Harnischfeger Corporation Mechanism for latchingly connecting telescoping members
FR2588843A1 (en) * 1985-10-18 1987-04-24 Hydro Materiels Installation for handling loads
US20050159220A1 (en) * 2003-12-15 2005-07-21 Gordon Wilson Method and interface system for facilitating access to fantasy sports leagues
US20150158670A1 (en) * 2012-09-04 2015-06-11 Murata Machinery, Ltd. Stacker crane
US9586757B2 (en) * 2012-09-04 2017-03-07 Murata Machinery, Ltd. Stacker crane

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