EP0286300A1 - Flèche pour plate-forme de travail - Google Patents

Flèche pour plate-forme de travail Download PDF

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Publication number
EP0286300A1
EP0286300A1 EP88302814A EP88302814A EP0286300A1 EP 0286300 A1 EP0286300 A1 EP 0286300A1 EP 88302814 A EP88302814 A EP 88302814A EP 88302814 A EP88302814 A EP 88302814A EP 0286300 A1 EP0286300 A1 EP 0286300A1
Authority
EP
European Patent Office
Prior art keywords
boom
boom section
section
link
pivot point
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.)
Withdrawn
Application number
EP88302814A
Other languages
German (de)
English (en)
Inventor
Ridley Stokoe
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.)
Aerial Access Equipment Ltd
Original Assignee
Aerial Access Equipment Ltd
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 Aerial Access Equipment Ltd filed Critical Aerial Access Equipment Ltd
Publication of EP0286300A1 publication Critical patent/EP0286300A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/044—Working platforms suspended from booms
    • B66F11/046—Working platforms suspended from booms of the telescoping type

Definitions

  • the present invention is concerned with personnel access lifts, that is lifts of the type used to enable an operator to gain access to an elevated location to perform some task at that location.
  • the invention is an improved boom for that purpose.
  • Personnel access lifts are available in many forms and a wide range of sizes, ranging from large commercial units to units which are small enough to be towed behind a car and manoeuvred manually. A major requirement is that all such lifts should be stable in use and in general safe in operation.
  • Such lifts as comprise a boom having two or more sections articulated together, mutual pivoting of adjacent boom sections is usually achieved by means of hydraulically-operated rams.
  • rams entails the provision of control equipment, both to ensure that no rams, operated individually or together, can move the boom sections into unstable configuration and also to insure against the consequences of hydraulic pressure failure.
  • Each ram and associated control equipment adds significantly to both the cost and the weight of the lift overall.
  • the personnel access lift boom comprises a first boom section, pivotally supported at a first pivot point in the region of a first end thereof, a second boom section pivoted at a second pivot point spaced from an end of said second boom section upon a pivot in the region of the other end of said first boom section, a link pivotally connecting a first link point in the region of said end of said second boom section and a second link point fixed relative to but spaced from said first pivot point, such that said link extends at an angle across the length of said first boom section in at least a majority of relative positions of said first and second boom sections, and hydraulic means for moving said first boom section about said first pivot point.
  • the personnel access lift boom may comprise more than two sections.
  • the two boom sections referred to above may be directly mounted upon a suitable fixed or mobile base or they may comprise the uppermost two sections of a boom consisting of three or four sections.
  • the first boom section is pivoted at the upper end of a generally vertical boom section and the second link point is located upon the generally vertical boom section below the first pivot point.
  • the generally vertical boom section may be retained in that orientation by means of a parallel motion linkage to the lift base.
  • the first boom section may be pivoted at the upper end of a support column on the lift base, the second link point being located on the column below the first pivot point.
  • the support column may be extensible vertically, for example telescopically extensible, to give further potential operating height to the access lift.
  • the first and second boom sections are pivoted together at a point (the second pivot point) spaced from the adjacent end of the second boom section.
  • the second boom section extends at an angle to its length (that is, is cranked) beyond the second pivot point, so that the point of connection of the link (the first link point) is somewhat out of line with the length of the second boom section.
  • the link by means of which pivoting of the second boom section is achieved, is a rigid link, for example in the form of a rod or flat bar.
  • the link may in appropriate forms of the invention be a flexible link such as a cable. In such latter forms of the invention, it is essential that the second boom section be so pivoted that it is able to return to its inoperative or stowed position by gravity alone.
  • the hydraulic means for moving the first boom section about the first pivot point may take the form of a hydraulic ram, which extends between the first boom section and a point upon the support for that section.
  • the ram may operate between the first boom section and either the base of the lift or a column upon which that section is pivoted.
  • the first and second boom sections are parts of a boom having more than two sections, then the ram may operate between the first boom section and a lower boom section upon which said first section is pivoted.
  • the hydraulic driving power for operating the access lift may be provided by some form of power take-off from an adjacent vehicle, for example a vehicle by means of which a mobile access lift is towed or a vehicle upon which the lift is mounted.
  • the uppermost boom section will carry at its upper end a platform or cage to carry the operator. It is highly desirable that a self-levelling mechanism be provided to maintain the platform level at all positions of the boom assembly.
  • Such self-levelling mechanisms for example tie-rods linking the platform to another part of the lift structure, are already known per se .
  • Operation of the lift is preferably effected from controls located on the platform or cage, so that an operator may enter the cage and elevate the latter and adjust its spatial position from within the cage.
  • the movement of the booms and cage may be controlled from a position at the base of the lift.
  • the illustrated personnel access lift is designed for mounting upon a vehicle chassis and if formed upon a base frame comprising two cross-members 3, together carrying a lifting jack 4 at each end.
  • the cross-members 3 are intended to be mounted transverse to the length of a vehicle chassis, such that the jacks 4 may be extended downwardly into contact with the ground on opposite sides of the chassis when the lift is to be brought into use.
  • Projecting vertically from the cross-members 3, at one side, preferably the nearside, of the vehicle is a column 5, which is telescopically extensible under hydraulic pressure.
  • the upper end 6 of the column 5 is at a level, when the column is contracted, which would be a little above the top of a cab of the vehicle.
  • the boom assembly is carried upon that column end 6.
  • the boom assembly is in four sections 7, 8, 9 and 10 and carries at its uppermost end (when extended) a personnel cage 11.
  • the lowermost boom section 7 is pivoted at one end at a pivot point 12 on the column end 6 and carries at its other end the vertical boom section 8.
  • Parallel to the boom section 7 and also linking the column end 6 and the boom section 8 is a rigid link 13, which holds the boom section 8 vertical whatever the position of the boom section 7.
  • the vertical boom section 8 In the stowed position of the boom assembly, as illustrated in Fig. 1, the vertical boom section 8 is located above the cross-members 3 at the opposite end of the cross-members to the column 5 and the lowermost boom section 7 lies across the vehicle at an angle of the order of 45° to the horizontal.
  • Pivoted at 14 (the "first pivot point” of the foregoing general description) on the upper end of the vertical boom section 8 is the boom section 9 (the “first boom section” of the foregoing general description).
  • the uppermost boom section 10 (the “second boom section”) is pivoted at 15 (the "second pivot point”).
  • the pivot 15 is spaced a short distance from the extreme end of the boom section 10, which latter section is bent at a small angle from the straight in the region of the pivot 15.
  • a rigid link 16 connects the end of the boom section 10 to a point 17 on the vertical boom section 8 slightly below the pivot 14.
  • a self-levelling mechanism (not shown) is provided to ensure that the cage 11 remains level in all positions of the boom assembly.
  • Pivoting of the boom section 7 about the pivot point 12 is effected by a hydraulic ram 18; pivoting of the boom section 9 about the pivot point 14 is effected by a hydraulic ram 19 (omitted from Fig. 2). As is explained hereinafter, no ram is required to operate the uppermost boom section 10, as this is achieved by means of the link 16.
  • link 16 replaces a hydraulic ram which would otherwise be required to swing the boom section 10 into its upwardly-extending operating position.
  • the opportunity to omit a hydraulic ram and its associated control equipment from the design represents a significant potential saving of weight and of cost as compared with a comparable conventional personnel access lift.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP88302814A 1987-04-04 1988-03-30 Flèche pour plate-forme de travail Withdrawn EP0286300A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878708123A GB8708123D0 (en) 1987-04-04 1987-04-04 Vehicle mounted access lift
GB8708123 1987-04-04

Publications (1)

Publication Number Publication Date
EP0286300A1 true EP0286300A1 (fr) 1988-10-12

Family

ID=10615284

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19880302815 Expired EP0286301B1 (fr) 1987-04-04 1988-03-30 Plate-forme de travail montable sur véhicule
EP88302814A Withdrawn EP0286300A1 (fr) 1987-04-04 1988-03-30 Flèche pour plate-forme de travail

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19880302815 Expired EP0286301B1 (fr) 1987-04-04 1988-03-30 Plate-forme de travail montable sur véhicule

Country Status (4)

Country Link
EP (2) EP0286301B1 (fr)
DE (1) DE3868962D1 (fr)
FI (1) FI881542A (fr)
GB (3) GB8708123D0 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5307898A (en) * 1993-03-08 1994-05-03 Purdy Paul J Aerial work apparatus
FR2702752B1 (fr) * 1993-03-17 1995-05-05 Hiviaco 88 Dispositif élévateur pour nacelle de transport de personnes.
FR2704539A1 (fr) * 1993-04-29 1994-11-04 Somadel Appareil d'élévation de personnel pour véhicule.
FR2774083B1 (fr) * 1998-01-27 2000-04-07 Kidde Ind Inc Dispositif elevateur perfectionne
CN115240447B (zh) * 2022-07-29 2023-04-25 重庆电子工程职业学院 一种智能交通障碍桩

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1137189B (de) * 1961-01-04 1962-09-27 Robel & Co G Fahrbare Arbeitsbuehne
FR2085509A1 (fr) * 1970-04-28 1971-12-24 Rotheisler John
US3807575A (en) * 1972-06-13 1974-04-30 Merrick Hydraulics Inc Elevating devices
US4019604A (en) * 1975-06-16 1977-04-26 Fabtek, Inc. Elevating platform apparatus
FR2511998A1 (fr) * 1981-08-27 1983-03-04 Laillet Jean Nacelle elevatrice a verin unique d'elevation
FR2521969A1 (fr) * 1982-02-25 1983-08-26 Tranchero Jacques Machine transportable sur vehicule, pouvant elever une nacelle a des hauteurs differentes
US4511015A (en) * 1983-06-15 1985-04-16 Purdy Paul J Manlift

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB618793A (en) * 1946-10-18 1949-02-28 Taylor & Sons Manchester Ltd F Improvements in or relating to mobile cranes
US3132718A (en) * 1960-04-27 1964-05-12 Hunt Pierce Corp Power-operated boom structure
FR1440808A (fr) * 1965-04-16 1966-06-03 élévateur perfectionné, adaptable à un véhicule
DK119543B (da) * 1967-11-14 1971-01-18 Sesam As Fremgangsmåde til af- og påmontering af en hydraulisk betjent løftekran på en lastbil.
GB1263604A (en) * 1969-07-05 1972-02-16 Simon Eng Dudley Ltd Aircraft refuelling apparatus
FR2085264B1 (fr) * 1970-04-02 1975-02-21 Potain Sa
DE2116842A1 (de) * 1970-04-08 1971-10-21 J Tranchero Fahrbarer, zum Aufbau auf Kraftfahrzeuge bestimmter Kran mit drei hydraulisch gesteuerten Hebestufen
GB1290402A (fr) * 1970-04-23 1972-09-27
GB1325474A (en) * 1970-11-05 1973-08-01 V Pt I Tyazhelogo Mash Mechanical elevator
CA973821A (en) * 1971-05-27 1975-09-02 Albert L. Clark Aerial platform
JPS5148144Y2 (fr) * 1971-10-20 1976-11-19
US3854606A (en) * 1971-11-26 1974-12-17 Cascade Corp Vehicle with material loader
GB1431980A (en) * 1973-12-28 1976-04-14 Merrick J A Elevating devices
SE454002B (sv) * 1984-11-16 1988-03-21 Sjolanders Smides Och Mekanisk Mobil arbetsplattform
US4623067A (en) * 1984-12-04 1986-11-18 Iowa Mold Tooling Co., Inc. Compact foldable crane

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1137189B (de) * 1961-01-04 1962-09-27 Robel & Co G Fahrbare Arbeitsbuehne
FR2085509A1 (fr) * 1970-04-28 1971-12-24 Rotheisler John
US3807575A (en) * 1972-06-13 1974-04-30 Merrick Hydraulics Inc Elevating devices
US4019604A (en) * 1975-06-16 1977-04-26 Fabtek, Inc. Elevating platform apparatus
FR2511998A1 (fr) * 1981-08-27 1983-03-04 Laillet Jean Nacelle elevatrice a verin unique d'elevation
FR2521969A1 (fr) * 1982-02-25 1983-08-26 Tranchero Jacques Machine transportable sur vehicule, pouvant elever une nacelle a des hauteurs differentes
US4511015A (en) * 1983-06-15 1985-04-16 Purdy Paul J Manlift

Also Published As

Publication number Publication date
GB8708123D0 (en) 1987-05-13
GB2203122A (en) 1988-10-12
GB2203122B (en) 1990-12-12
GB8807595D0 (en) 1988-05-05
GB2203123A (en) 1988-10-12
DE3868962D1 (de) 1992-04-16
EP0286301A1 (fr) 1988-10-12
EP0286301B1 (fr) 1992-03-11
FI881542A0 (fi) 1988-03-31
GB2203123B (en) 1990-12-12
FI881542A (fi) 1988-10-05
GB8807596D0 (en) 1988-05-05

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