EP0286300A1 - Personnel access lift boom - Google Patents
Personnel access lift boom Download PDFInfo
- 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- Withdrawn
Links
Images
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)
Abstract
A boom for a personnel access lift comprises at least two boom sections (9, 10), namely a first boom section (9), pivotally supported at a first pivot point (14) in the region of a first end thereof, and a second boom section (10) pivoted at a second pivot point (15) spaced from an end of said second boom section (10) upon a pivot in the region of the other end of said first boom section (9). A link (16) pivotally connects a first link point in the region of said end of the second boom section and a second link point (17) fixed relative to but spaced from the first pivot point (14), such that the link (16) extends at an angle across the length of the first boom section (9). Hydraulic means (19) are provided for moving the first boom section (9) about the first pivot point (14).
Description
- 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. In 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. However the use of such 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.
- It is an object of the present invention to provide a novel form of boom for a personnel access lift, by means of which at least one operating ram and its associated control equipment may be dispensed with.
- The personnel access lift boom according to the present invention 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.
- By virtue of the link and in particular the disposition of the two link points between which it extends, pivoting of the first boom section about the first pivot point automatically gives rise to pivoting of the second boom section about the second pivot point in the same rotational direction. Thus the conventional need for hydraulic means to effect relative movement of the first and second boom sections no longer arises.
- The personnel access lift boom may comprise more than two sections. Thus, for example, 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. In one preferred form of the invention, 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. As an alternative, 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. In a particularly preferred form of the invention, 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.
- Preferably 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. However 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. Thus, for example, when the boom comprises only two sections, 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. When 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. Advantageously, 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. As a less preferred alternative which requires a second operator, the movement of the booms and cage may be controlled from a position at the base of the lift.
- The invention will now be further described by way of example with reference to the accompanying drawings, wherein:-
- Fig. 1 illustrates, in elevation from the rear, one embodiment of personnel access lift incorporating a lift boom according to the present invention, the lift being shown in a stowed condition; and
- Fig. 2 illustrates, in elevation from the rear and to a somewhat smaller scale, the lift of Fig. 1 in a fully-extended condition.
- 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 alifting jack 4 at each end. Thecross-members 3 are intended to be mounted transverse to the length of a vehicle chassis, such that thejacks 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 thecross-members 3, at one side, preferably the nearside, of the vehicle is acolumn 5, which is telescopically extensible under hydraulic pressure. Theupper end 6 of thecolumn 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 thatcolumn end 6. - The boom assembly is in four
sections personnel cage 11. Thelowermost boom section 7 is pivoted at one end at apivot point 12 on thecolumn end 6 and carries at its other end thevertical boom section 8. Parallel to theboom section 7 and also linking thecolumn end 6 and theboom section 8 is arigid link 13, which holds theboom section 8 vertical whatever the position of theboom section 7. In the stowed position of the boom assembly, as illustrated in Fig. 1, thevertical boom section 8 is located above thecross-members 3 at the opposite end of the cross-members to thecolumn 5 and thelowermost 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). On the other end of theboom section 9, the uppermost boom section 10 (the "second boom section") is pivoted at 15 (the "second pivot point"). Thepivot 15 is spaced a short distance from the extreme end of theboom section 10, which latter section is bent at a small angle from the straight in the region of thepivot 15. Arigid link 16 connects the end of theboom section 10 to apoint 17 on thevertical boom section 8 slightly below thepivot 14. A self-levelling mechanism (not shown) is provided to ensure that thecage 11 remains level in all positions of the boom assembly. - Pivoting of the
boom section 7 about thepivot point 12 is effected by ahydraulic ram 18; pivoting of theboom section 9 about thepivot point 14 is effected by a hydraulic ram 19 (omitted from Fig. 2). As is explained hereinafter, no ram is required to operate theuppermost boom section 10, as this is achieved by means of thelink 16. - In extending the assembly from the stowed position of Fig. 1 to the extended position of Fig. 2, the operator enters the
personnel cage 11 at vehicle level and then first extends thecolumn 5 to a desired upward extent, for example until thecolumn head 6 is clear of the vehicle cab. Thehead 6 is able to rotate relative to theinner shaft 20 of the column if desired. Next theram 18 is operated to swing theboom section 7 upwards and thereby to raise thevertical boom section 8 to a higher operating position. Operation of theram 19 now swings theboom section 9 upwards. By virtue of thelink 16, this action also causes theuppermost boom section 10 to pivot in a clockwise direction as illustrated about thepivot 15, thus raising thepersonnel cage 11 to its desired operating height. - It will be apparent that the
link 16 replaces a hydraulic ram which would otherwise be required to swing theboom 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. - It is a further advantage of the access lift boom according to the invention that it is possible to achieve an increase in operating height relative to a comparable conventional boom, without any significant increase in the lateral out-reach required to achieve that height.
Claims (8)
1. A boom for a personnel access lift, which boom comprises a first boom section (9), pivotally supported at a first pivot point (14) in the region of a first end thereof, and a second boom section (10), characterised in that said second boom section is pivoted at a second pivot point (15) spaced from an end of said second boom section (10) upon a pivot in the region of the other end of said first boom section (9), that a link (16) pivotally connects a first link point in the region of said end of said second boom section and a second link point (17) fixed relative to but spaced from said first pivot point (14), such that said link (16) extends at an angle across the length of said first boom section (9) in at least a majority of relative positions of said first and second boom sections (9, 10), and by hydraulic means (19) for moving said first boom section (9) about said first pivot point (14).
2. An access lift boom according to claim 1, characterised in that it comprises only said two boom sections (9, 10), said first boom section (9) being directly mounted upon a fixed or mobile base.
3. An access lift boom according to claim 1, characterised in that it comprises only said two boom sections (9, 10), said first boom section (9) being pivoted at the upper end (6) of a support column (5) on a fixed or mobile base (3).
4. An access lift boom according to claim 3, characterised in that said support column (5), is extensible vertically.
5. An access lift boom according to claim 1, characterised in that it comprises three or four boom sections (7, 8, 9, 10), wherein said first and second boom sections (9, 10) are the uppermost thereof.
6. An access lift boom according to any of the preceding claims, characterised in that said second boom section (10) extends at an angle to its length beyond the sentry pivot point (15).
7. An access lift boom according to any of the preceding claims, characterised in that said link (16) is a rigid rod or a flat bar.
8. An access lift boom according to any of the preceding claims, characterised in that said hydraulic means is a hydraulic ram (19).
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 (en) | 1988-10-12 |
Family
ID=10615284
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88302814A Withdrawn EP0286300A1 (en) | 1987-04-04 | 1988-03-30 | Personnel access lift boom |
EP19880302815 Expired EP0286301B1 (en) | 1987-04-04 | 1988-03-30 | Vehicle-mountable access lift |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880302815 Expired EP0286301B1 (en) | 1987-04-04 | 1988-03-30 | Vehicle-mountable access lift |
Country Status (4)
Country | Link |
---|---|
EP (2) | EP0286300A1 (en) |
DE (1) | DE3868962D1 (en) |
FI (1) | FI881542A (en) |
GB (3) | GB8708123D0 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5307898A (en) * | 1993-03-08 | 1994-05-03 | Purdy Paul J | Aerial work apparatus |
FR2702752B1 (en) * | 1993-03-17 | 1995-05-05 | Hiviaco 88 | Lifting device for nacelle for transporting people. |
FR2704539A1 (en) * | 1993-04-29 | 1994-11-04 | Somadel | Personnel lifting apparatus for vehicle |
FR2774083B1 (en) * | 1998-01-27 | 2000-04-07 | Kidde Ind Inc | IMPROVED LIFTING DEVICE |
CN115240447B (en) * | 2022-07-29 | 2023-04-25 | 重庆电子工程职业学院 | Intelligent traffic obstacle stake |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1137189B (en) * | 1961-01-04 | 1962-09-27 | Robel & Co G | Mobile work platform |
FR2085509A1 (en) * | 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 (en) * | 1981-08-27 | 1983-03-04 | Laillet Jean | Vertically movable maintenance basket - has actuator operating via support arms to move basket vertically |
FR2521969A1 (en) * | 1982-02-25 | 1983-08-26 | Tranchero Jacques | VEHICLE TRANSPORTABLE MACHINE, CAPABLE OF LIFTING A NACELLE AT DIFFERENT HEIGHTS |
US4511015A (en) * | 1983-06-15 | 1985-04-16 | Purdy Paul J | Manlift |
Family Cites Families (15)
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 (en) * | 1965-04-16 | 1966-06-03 | advanced lift, adaptable to a vehicle | |
DK119543A (en) * | 1967-11-14 | 1971-01-18 | ||
GB1263604A (en) * | 1969-07-05 | 1972-02-16 | Simon Eng Dudley Ltd | Aircraft refuelling apparatus |
FR2085264B1 (en) * | 1970-04-02 | 1975-02-21 | Potain Sa | |
DE2116842A1 (en) * | 1970-04-08 | 1971-10-21 | J Tranchero | Mobile crane designed for mounting on motor vehicles with three hydraulically controlled lifting stages |
GB1290402A (en) * | 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 (en) * | 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 (en) * | 1984-11-16 | 1988-03-21 | Sjolanders Smides Och Mekanisk | MOBILE WORKPLATFORM |
US4623067A (en) * | 1984-12-04 | 1986-11-18 | Iowa Mold Tooling Co., Inc. | Compact foldable crane |
-
1987
- 1987-04-04 GB GB878708123A patent/GB8708123D0/en active Pending
-
1988
- 1988-03-30 DE DE8888302815T patent/DE3868962D1/en not_active Expired - Fee Related
- 1988-03-30 GB GB8807596A patent/GB2203123B/en not_active Expired - Fee Related
- 1988-03-30 EP EP88302814A patent/EP0286300A1/en not_active Withdrawn
- 1988-03-30 GB GB8807595A patent/GB2203122B/en not_active Expired - Fee Related
- 1988-03-30 EP EP19880302815 patent/EP0286301B1/en not_active Expired
- 1988-03-31 FI FI881542A patent/FI881542A/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1137189B (en) * | 1961-01-04 | 1962-09-27 | Robel & Co G | Mobile work platform |
FR2085509A1 (en) * | 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 (en) * | 1981-08-27 | 1983-03-04 | Laillet Jean | Vertically movable maintenance basket - has actuator operating via support arms to move basket vertically |
FR2521969A1 (en) * | 1982-02-25 | 1983-08-26 | Tranchero Jacques | VEHICLE TRANSPORTABLE MACHINE, CAPABLE OF LIFTING A NACELLE AT DIFFERENT HEIGHTS |
US4511015A (en) * | 1983-06-15 | 1985-04-16 | Purdy Paul J | Manlift |
Also Published As
Publication number | Publication date |
---|---|
GB8807595D0 (en) | 1988-05-05 |
FI881542A (en) | 1988-10-05 |
GB8708123D0 (en) | 1987-05-13 |
GB8807596D0 (en) | 1988-05-05 |
DE3868962D1 (en) | 1992-04-16 |
GB2203122A (en) | 1988-10-12 |
FI881542A0 (en) | 1988-03-31 |
GB2203123B (en) | 1990-12-12 |
GB2203123A (en) | 1988-10-12 |
GB2203122B (en) | 1990-12-12 |
EP0286301B1 (en) | 1992-03-11 |
EP0286301A1 (en) | 1988-10-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6024191A (en) | Lift apparatus having an articulated double parallelogram boom assembly | |
US4718814A (en) | Forklift variable reach mechanism | |
US4019604A (en) | Elevating platform apparatus | |
US6378652B1 (en) | Lateral jib for vertical mast mobile elevating work platform | |
EP0747316A2 (en) | Centerline double riser with single lift cylinder and link for a low profile self propelled aerial work platform | |
US4185426A (en) | Extension/elevation intra-action device for aerial lift apparatus | |
US4236861A (en) | Scissors lift with pipe handler | |
DE60117249T3 (en) | BOOM MECHANISM | |
US3223251A (en) | Displaceable jack for automotive vehicles | |
US3966070A (en) | Mechanism for loader bucket or forklift mast on a material handling vehicle | |
US6138844A (en) | Boom truck | |
US3184086A (en) | High lift mobile loader | |
US3802589A (en) | Dual extensible reach truck | |
EP0099636A1 (en) | Access equipment | |
US3198359A (en) | Reaching type loader | |
EP0286300A1 (en) | Personnel access lift boom | |
JP3390018B2 (en) | Elevating work platform | |
GB1594178A (en) | Telescoping aerial lift | |
US5355970A (en) | Multicell articulated riser system for a self propelled aerial work platform | |
JPS594600A (en) | Platform for approach | |
CN108657057A (en) | Car transporter | |
RU2307062C2 (en) | Device for lifting and laying mast and lifting boom of lifting crane | |
GB1600387A (en) | Telescopic cantilever arm assembly with load levelling means | |
WO1988006567A1 (en) | Device in a fork truck | |
GB2120998A (en) | An access platform |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB IT SE |
|
17P | Request for examination filed |
Effective date: 19890511 |
|
17Q | First examination report despatched |
Effective date: 19920122 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19920602 |