CA2092524C - Arrangement in a two mast platform - Google Patents
Arrangement in a two mast platform Download PDFInfo
- Publication number
- CA2092524C CA2092524C CA002092524A CA2092524A CA2092524C CA 2092524 C CA2092524 C CA 2092524C CA 002092524 A CA002092524 A CA 002092524A CA 2092524 A CA2092524 A CA 2092524A CA 2092524 C CA2092524 C CA 2092524C
- Authority
- CA
- Canada
- Prior art keywords
- platform
- drive support
- mast
- movement
- transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/18—Scaffolds primarily resting on the ground adjustable in height
- E04G1/20—Scaffolds comprising upright members and provision for supporting cross-members or platforms at different positions therealong
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Movable Scaffolding (AREA)
- Braking Arrangements (AREA)
- Electric Cable Installation (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Invalid Beds And Related Equipment (AREA)
- Transmission Devices (AREA)
- Jib Cranes (AREA)
- Ladders (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
The invention relates to an arrangement in an elongated working platform (2) which at each end is carried by a mast via a drive support (8) movable along the mast. The drive support includes an electric motor unit by means of which the drive support is drivable along the mast, said drive support pivotally carrying the corresponding end of the platform. At each motor unit an op-erating means for manual release of a motor brake for lowering the platform in case of power failure, is connected to a levelling device (24-38). The levelling device is arranged to be triggered in order to prevent movement of a drive support resulting in devia-tion of the platform from a position essentially corresponding to the horizontal position, said transmission being arranged to re-turn the operating means to a position activating the motor brake, if the manual release of the motor brake causes triggering of the levelling device.
Description
~~ ~~ j W0 92/06258 PCT/SE91 /Q(3563 An arrangement in a two mast platform.
The present invention relates to an arrangement in an elongated working platform which at each end is carried by a mast via a drive support movable along the mast and including an electric motor unit by means of which the drive support is drivable along the mast, said drive support pivotally carrying the corresponding end of the platform.
The object of the invention is to make possible, in a platform of the above indicated kind, lowering of the platform in a safe way in case of power failure.
According to the invention this is attained in that, at' each motor unit, an operating means for manual release of a motor brake, for lowering the platform in case of power failure, is connected to a levelling device which is arranged to be triggered in order to prevent movement of a drive support resulting in deviation of the platform from a position essentially corresponding to the horizontal position, said transmission being arranged to return the operating means to a position activating the motor brake, if the manual release of the motor brake causes triggering of the levelling device.
Thus, by means of the invention tilting of the working platform is prevented when 'the motor brakes are manually released, so that the platform by its own weight slides along the mast.
~ An embodiment of the invention shall now be described more closely below with reference to the attached drawings, on which Figure 1 is a sideview illustrating a two mast working platform of the kind in which the invention can be used, ~5 Figure 2 to a greater scale illustrates a part, essential to the invention, in connection with the left hand mast of the platform shown in Figure 1, and Figure 3 likewise to a greater scale shows a view perpendicular to Figure 2 of said part.
WO 92/06258 ~ ~ ~ ~'~ ~ ~ PCT/5E91l00563 Figure 1 illustrates how an elongated working platform 2, built up by means of framework sections, at each end is carried by a framework mast 4 and 6, respectively, via a respective drive support 8 and 10 movable along the mast.
More particularly, the drive support, in a manner known per se and not shown, by means of rollers can abut against longitudinally extending roller races of the mast and be carried via tooth wheels on a tooth rack extending slang the mast. The tooth wheels are driven by an electric motor to unit 12 and 14, respectively, only schematically illustrated in Figure l, so that the respective drive supports 8 and 10 can be driven along the mast. ' The drive supports 8 and 10 pivotally carry the platform 2 at the upper side thereof at 16 and 18, respectively. By means of the pivoted support of the platform 2 wedging between the platform and the masts is prevented in case of tilting of the platform.
Between the drive supports 8 and 10 and the corresponding ends of the platform 2 there is a levelling mechanism comprising means included in an arrangement according to the invention and described below with reference to Figures 2 and 3. Generally such levelling mechanisms are, however, arranged to be triggered for preventing movement of the drive supports which can result in deviation of the platform from a position essentially corresponding to the horizontal position. During normal driving this can be carried through by temporarily stopping, by means of electric breakers, the driving motor unit which is driven too fast, until the platform has taken a horizontal position again. The breakers can be automatically operated as controlled by the position of the platform. The design of such levelling mechanisms for carrying through this function is well known and need therefore not be described more closely here.
Tn the embodiment illustrated and described here the arrangement according to the invention is supposed to form part of a levelling mechanism having the described function, although it could also be imagined to be used separately from such a mechanism.
The present invention relates to an arrangement in an elongated working platform which at each end is carried by a mast via a drive support movable along the mast and including an electric motor unit by means of which the drive support is drivable along the mast, said drive support pivotally carrying the corresponding end of the platform.
The object of the invention is to make possible, in a platform of the above indicated kind, lowering of the platform in a safe way in case of power failure.
According to the invention this is attained in that, at' each motor unit, an operating means for manual release of a motor brake, for lowering the platform in case of power failure, is connected to a levelling device which is arranged to be triggered in order to prevent movement of a drive support resulting in deviation of the platform from a position essentially corresponding to the horizontal position, said transmission being arranged to return the operating means to a position activating the motor brake, if the manual release of the motor brake causes triggering of the levelling device.
Thus, by means of the invention tilting of the working platform is prevented when 'the motor brakes are manually released, so that the platform by its own weight slides along the mast.
~ An embodiment of the invention shall now be described more closely below with reference to the attached drawings, on which Figure 1 is a sideview illustrating a two mast working platform of the kind in which the invention can be used, ~5 Figure 2 to a greater scale illustrates a part, essential to the invention, in connection with the left hand mast of the platform shown in Figure 1, and Figure 3 likewise to a greater scale shows a view perpendicular to Figure 2 of said part.
WO 92/06258 ~ ~ ~ ~'~ ~ ~ PCT/5E91l00563 Figure 1 illustrates how an elongated working platform 2, built up by means of framework sections, at each end is carried by a framework mast 4 and 6, respectively, via a respective drive support 8 and 10 movable along the mast.
More particularly, the drive support, in a manner known per se and not shown, by means of rollers can abut against longitudinally extending roller races of the mast and be carried via tooth wheels on a tooth rack extending slang the mast. The tooth wheels are driven by an electric motor to unit 12 and 14, respectively, only schematically illustrated in Figure l, so that the respective drive supports 8 and 10 can be driven along the mast. ' The drive supports 8 and 10 pivotally carry the platform 2 at the upper side thereof at 16 and 18, respectively. By means of the pivoted support of the platform 2 wedging between the platform and the masts is prevented in case of tilting of the platform.
Between the drive supports 8 and 10 and the corresponding ends of the platform 2 there is a levelling mechanism comprising means included in an arrangement according to the invention and described below with reference to Figures 2 and 3. Generally such levelling mechanisms are, however, arranged to be triggered for preventing movement of the drive supports which can result in deviation of the platform from a position essentially corresponding to the horizontal position. During normal driving this can be carried through by temporarily stopping, by means of electric breakers, the driving motor unit which is driven too fast, until the platform has taken a horizontal position again. The breakers can be automatically operated as controlled by the position of the platform. The design of such levelling mechanisms for carrying through this function is well known and need therefore not be described more closely here.
Tn the embodiment illustrated and described here the arrangement according to the invention is supposed to form part of a levelling mechanism having the described function, although it could also be imagined to be used separately from such a mechanism.
With reference to Figure 2, the levelling mechanism includes a rod 24 which is supported on the drive unit 8 at 20 and 22 to be shiftable: transversely to the mast 4. One end of the rod is connected to the lower part of the platform at 26 by ~~ means of a coupling, riol~ shown, which admits mutual tilting of the platform 2 and tre :rod 24 at movement of the platform about the pivot 16.
The rod 24 carries a cam 28 shaped as a double cone, with which one end 3C, arranged as a cam follower, of a lever arm 32 can cooperate. :3et.ween its ends the lever arm 32 is pivotally supported a_t: 34 and the other end 36 thereof is coupled to a Bowden cable 38. Via guides not shown in more detail the Bowden* ca.h~l~= 38 leads to the electric motor unit 12 for cooperating with i.ts motor brake in a way to be described more closely below.
In Figure = the electric motor unit is shown as comprising two mator;~ 40 and 42, respectively, arranged in parallel with each other and being arranged to drive a respective tooth wheel indicated at 44 and 46, said tooth wheels, as described above, being in engagement with a tooth rack extending along t:.he mast but not shown on the drawing. At 48 a catching mechani:;m is indicated. The tooth rack drive of the drive supports 8 ~znd 10 along the mast by means of elements 40-46, as we=Ll as the catching apparatus 48 can be of a conventional kind and need not therefore be described more closely here.
Each motor_ 9:0 and 42 has a respective motor brake device 50 anc~ 52 of mE:~chanical type arranged, at power failure, to be actuated for locking the motor shaft against rotation and thereby the i~ooth WrIE'_E:'.1S 44 and 46 to t:he tooth rack. The *Trade-mark design of they motor brakes can be of conventional kind known per see, where the actuating and releasing movements of the brake are linear in the direction of the motor shaft towards and away, respectively, from the tooth rack.
__. The movable e:Lements of the motor brakes 50 and 52 are interconnected by means of a link system 54 designed to be manually available from the drive support for releasing the motor brakes 50 and 52 by movement in the direction of the arrow 55.
At 56 the other end of the Bowden cable 38 is connected to the link: system in such a way that the cable, at movement cont:rary to t:he direction of the arrow 55, can draw the motor br~rkes 50 and 52 via the link system 54 for activating the motor );:rakes, and at movement of the link system in the direction of the arrow 56 can follow this movement.
At power fai.l~are the platform 2 can be lowered by its own weight bar releasi.ng t:he motor brakes at both drive supports 8 and 10, re:~pect.ivel.y, manually by operating the link system 54 in the wa~T descried ~bave.
If it is a~ssu:ned that the platform should tend to tilt downwardly at it:; left hand end i.n Figure 1 this results in the platform turning counter clockwise about the pivot 16.
This in turn results i.n the lower side of the platform moving away from the mast 4 and thereby pulling the rod 24 with it, the cam 28 then following this movement. and pressing the cam follower 30 upwardly :ao that the 1_ever arm 32 turns clockwise.
Thereby the Bowden cable 38 is pulled downwardly in Figure 2 and contrary to the c~_~rec:tion of arrow 55 in Figure 3 , the manual force against t:he link system 54 then being not able to resist this movement, but the motor brake is actuated by movement in <~ directic:>n contrary t:o the arrow 55 so that the drive support 8 is stopped temporarily. The platform 2 will then, by means of the c:oni~inuing unhindered movement of the drive support 10, atta:zn horizontal position again while shifting the :rod 24 to the left in Figure 2. Thereby the cam 5 28 will finally escape from the engagement with the cam follower 30 s~~ that t:hE~ continued manual force on the link system 54 can again release the motor brakes 50 and 52 and the descending movement o:E the drive support 8 can be resumed.
The breaker; mentioned briefly above for the normal operation of the drive motor units are .indicated at 60 in Figure 2. They are op~=gated by cams 62 and 64 being likewise positioned on the rod 24.
The invention i.s, of course, not limited to the embodiment shown on the c~:rawing and described above, but can be modified within the s~~o~>e of the patent claims.
The rod 24 carries a cam 28 shaped as a double cone, with which one end 3C, arranged as a cam follower, of a lever arm 32 can cooperate. :3et.ween its ends the lever arm 32 is pivotally supported a_t: 34 and the other end 36 thereof is coupled to a Bowden cable 38. Via guides not shown in more detail the Bowden* ca.h~l~= 38 leads to the electric motor unit 12 for cooperating with i.ts motor brake in a way to be described more closely below.
In Figure = the electric motor unit is shown as comprising two mator;~ 40 and 42, respectively, arranged in parallel with each other and being arranged to drive a respective tooth wheel indicated at 44 and 46, said tooth wheels, as described above, being in engagement with a tooth rack extending along t:.he mast but not shown on the drawing. At 48 a catching mechani:;m is indicated. The tooth rack drive of the drive supports 8 ~znd 10 along the mast by means of elements 40-46, as we=Ll as the catching apparatus 48 can be of a conventional kind and need not therefore be described more closely here.
Each motor_ 9:0 and 42 has a respective motor brake device 50 anc~ 52 of mE:~chanical type arranged, at power failure, to be actuated for locking the motor shaft against rotation and thereby the i~ooth WrIE'_E:'.1S 44 and 46 to t:he tooth rack. The *Trade-mark design of they motor brakes can be of conventional kind known per see, where the actuating and releasing movements of the brake are linear in the direction of the motor shaft towards and away, respectively, from the tooth rack.
__. The movable e:Lements of the motor brakes 50 and 52 are interconnected by means of a link system 54 designed to be manually available from the drive support for releasing the motor brakes 50 and 52 by movement in the direction of the arrow 55.
At 56 the other end of the Bowden cable 38 is connected to the link: system in such a way that the cable, at movement cont:rary to t:he direction of the arrow 55, can draw the motor br~rkes 50 and 52 via the link system 54 for activating the motor );:rakes, and at movement of the link system in the direction of the arrow 56 can follow this movement.
At power fai.l~are the platform 2 can be lowered by its own weight bar releasi.ng t:he motor brakes at both drive supports 8 and 10, re:~pect.ivel.y, manually by operating the link system 54 in the wa~T descried ~bave.
If it is a~ssu:ned that the platform should tend to tilt downwardly at it:; left hand end i.n Figure 1 this results in the platform turning counter clockwise about the pivot 16.
This in turn results i.n the lower side of the platform moving away from the mast 4 and thereby pulling the rod 24 with it, the cam 28 then following this movement. and pressing the cam follower 30 upwardly :ao that the 1_ever arm 32 turns clockwise.
Thereby the Bowden cable 38 is pulled downwardly in Figure 2 and contrary to the c~_~rec:tion of arrow 55 in Figure 3 , the manual force against t:he link system 54 then being not able to resist this movement, but the motor brake is actuated by movement in <~ directic:>n contrary t:o the arrow 55 so that the drive support 8 is stopped temporarily. The platform 2 will then, by means of the c:oni~inuing unhindered movement of the drive support 10, atta:zn horizontal position again while shifting the :rod 24 to the left in Figure 2. Thereby the cam 5 28 will finally escape from the engagement with the cam follower 30 s~~ that t:hE~ continued manual force on the link system 54 can again release the motor brakes 50 and 52 and the descending movement o:E the drive support 8 can be resumed.
The breaker; mentioned briefly above for the normal operation of the drive motor units are .indicated at 60 in Figure 2. They are op~=gated by cams 62 and 64 being likewise positioned on the rod 24.
The invention i.s, of course, not limited to the embodiment shown on the c~:rawing and described above, but can be modified within the s~~o~>e of the patent claims.
Claims (5)
1. An arrangement in an elongated working platform (2) which at each end is carried by a mast (4,6) via a drive support (8,10) movable along the mast and including an electric motor unit (12, 14) by means of which the drive support is drivable along the mast, said drive support pivotally carrying the corresponding end of the platform, characterized in that, at each motor unit (12, 14), an operating means (54) for manual release of a motor brake (50, 52), for lowering the platform in case of power failure, is connected to a levelling device (24-38) which is arranged to be triggered in order to prevent movement of a drive support resulting in deviation of the platform from a position essentially corresponding to the horizontal position, a transmission being arranged to return the operating means (54) to a position activating the motor brake, if the manual release of the motor brake causes triggering of the levelling device.
2. Arrangement according to claim 1, characterized in that the levelling device at each drive support comprises a mechanism (24-32) acting upon tilting of the platform (2) with respect to the corresponding mast, and by means of which the levelling device is connected to the transmission.
3. An arrangement according to claim 2, characterized in that the mechanism includes a mechanical means (24), reacting by a mechanical movement on tilting of the platform (2), and being mechanically connected with the transmission, which is deviced as a mechanical transmission device, so that said mechanical movement is transferred to a return movement of the operating means 154).
4. An arrangement according to claim 3, characterized in that the mechanical means comprises a cam (28), the movement of which being sensed by a cam follower (30), which is connected to the transmission which is arranged as a Bowden* cable (38), link train.
5. An arrangement according to claim 4, characterized in that the movement of the cam (28) is a translatory movement, and that the cam follower (30) forms part of a two arm lever (32), which is pivotally carried between its ends, of which one abuts the cam and the other one (36) is connected to the transmission.
*Trade-mark
*Trade-mark
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9003137-8 | 1990-10-02 | ||
| SE9003137A SE467313B (en) | 1990-10-02 | 1990-10-02 | DEVICE FOR TWO MASTED WORKPLATFORM |
| PCT/SE1991/000563 WO1992006258A1 (en) | 1990-10-02 | 1991-08-28 | An arrangement in a two mast platform |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2092524A1 CA2092524A1 (en) | 1992-04-03 |
| CA2092524C true CA2092524C (en) | 2002-05-28 |
Family
ID=20380525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002092524A Expired - Lifetime CA2092524C (en) | 1990-10-02 | 1991-08-28 | Arrangement in a two mast platform |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0653007B1 (en) |
| JP (1) | JP3142293B2 (en) |
| KR (1) | KR970009261B1 (en) |
| AT (1) | ATE145444T1 (en) |
| AU (1) | AU663688B2 (en) |
| CA (1) | CA2092524C (en) |
| DE (1) | DE69123265T2 (en) |
| SE (1) | SE467313B (en) |
| WO (1) | WO1992006258A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL9300629A (en) * | 1993-04-14 | 1994-11-01 | Hek Manufacturing B V | Height adjustable platform. |
| NL9401264A (en) * | 1994-08-02 | 1996-03-01 | Blok Beheer Bv | Lifting device |
| US6523647B2 (en) | 2001-05-21 | 2003-02-25 | Hydro Mobile Inc. | Elevating platform assembly |
| JP5463229B2 (en) * | 2010-07-20 | 2014-04-09 | 三成研機株式会社 | Manual braking device for lifting scaffolds |
| JP5995267B2 (en) * | 2012-05-08 | 2016-09-21 | 光洋機械産業株式会社 | Lifting scaffolding device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE311734B (en) * | 1967-12-08 | 1969-06-23 | Meyer Machine Inc | |
| AU4753885A (en) * | 1984-09-17 | 1986-03-27 | John Edward Commerford | Improvements in work platforms |
| SE462336B (en) * | 1986-04-07 | 1990-06-11 | Malmqvist Produkter Ab G | Drivable platform for scaffolding |
-
1990
- 1990-10-02 SE SE9003137A patent/SE467313B/en not_active IP Right Cessation
-
1991
- 1991-08-28 EP EP91919382A patent/EP0653007B1/en not_active Expired - Lifetime
- 1991-08-28 AU AU86643/91A patent/AU663688B2/en not_active Expired
- 1991-08-28 CA CA002092524A patent/CA2092524C/en not_active Expired - Lifetime
- 1991-08-28 KR KR1019930700804A patent/KR970009261B1/en not_active IP Right Cessation
- 1991-08-28 JP JP03516559A patent/JP3142293B2/en not_active Expired - Lifetime
- 1991-08-28 AT AT91919382T patent/ATE145444T1/en not_active IP Right Cessation
- 1991-08-28 DE DE69123265T patent/DE69123265T2/en not_active Expired - Lifetime
- 1991-08-28 WO PCT/SE1991/000563 patent/WO1992006258A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| KR930702592A (en) | 1993-09-09 |
| ATE145444T1 (en) | 1996-12-15 |
| DE69123265T2 (en) | 1997-03-20 |
| SE9003137L (en) | 1992-04-03 |
| EP0653007B1 (en) | 1996-11-20 |
| AU663688B2 (en) | 1995-10-19 |
| JP3142293B2 (en) | 2001-03-07 |
| EP0653007A1 (en) | 1995-05-17 |
| SE467313B (en) | 1992-06-29 |
| AU8664391A (en) | 1992-04-28 |
| DE69123265D1 (en) | 1997-01-02 |
| KR970009261B1 (en) | 1997-06-09 |
| SE9003137D0 (en) | 1990-10-02 |
| JPH06501528A (en) | 1994-02-17 |
| CA2092524A1 (en) | 1992-04-03 |
| WO1992006258A1 (en) | 1992-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |