WO2004018800A1 - An improved lifting frame - Google Patents

An improved lifting frame Download PDF

Info

Publication number
WO2004018800A1
WO2004018800A1 PCT/AU2003/001065 AU0301065W WO2004018800A1 WO 2004018800 A1 WO2004018800 A1 WO 2004018800A1 AU 0301065 W AU0301065 W AU 0301065W WO 2004018800 A1 WO2004018800 A1 WO 2004018800A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
hoist
respect
lifting
hoist means
Prior art date
Application number
PCT/AU2003/001065
Other languages
French (fr)
Inventor
Emilio Rosati
Paul Brazis
Rudiger Totsenberger
Original Assignee
Formula One Self Driving Screens Pty 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 Formula One Self Driving Screens Pty Ltd filed Critical Formula One Self Driving Screens Pty Ltd
Priority to AU2003250612A priority Critical patent/AU2003250612B2/en
Publication of WO2004018800A1 publication Critical patent/WO2004018800A1/en

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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
    • B66F7/12—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by mechanical jacks
    • 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
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/32—Safety or protective measures for persons during the construction of buildings
    • E04G21/3204—Safety or protective measures for persons during the construction of buildings against falling down
    • E04G21/3223—Means supported by building floors or flat roofs, e.g. safety railings

Definitions

  • This invention relates to an improved lifting frame, and in particular to ensure the lifting means of the frame are maintained principally in tension.
  • One of the methods described in the earlier patent application for lifting the screen comprises a pair of lead screws or spindles which are operated between two beams, one being a motor beam and the other being a support beam. As the screen is lifted, the two beams come together. The support beam is then secured to the building and the motor beam is released. The motor is operated so that the lead screws push the motor beam upwardly.
  • the screen may also be lifted in combination with the motor beam.
  • the motor beam is secured to the screen so that both raise up in relation to the support beam.
  • the invention is a lifting frame and includes: a first frame; a second frame slidable with respect to said first frame; a hoist means extending vertically and held with respect to said first frame; and a hoist actuator mounted on said second frame that operatively engages said hoist means between its ends to cause movement of said first frame with respect to said second frame where, in use, fixing of said second frame to a fixed support results in said first frame being lifted or lowered with respect to said second frame so that the portion of said hoist means below said hoist actuator is maintained in tension.
  • the portion of the hoist means that is below the hoist actuator is maintained in tension during the lifting of the first frame.
  • the invention also includes the first frame being held with respect to a fixed support. In this case the portion of the hoist means above the hoist actuator is maintained in tension.
  • the hoist means may comprise one or more elongate threaded spindles that are secured at either end to the first frame.
  • the hoist actuator may comprise a threaded collar which is rotated by an electric motor via associated gearing. The threaded collar is fixed with respect to the second frame and therefore rotation of the threaded collar causes the first frame to move with respect to the second frame.
  • the hoist means may comprise an elongate tooth rack that is fixed to the first frame with the hoist actuator comprising a driven gear wheel which is fixed to the second frame. Again, the portion of the rack below the gear wheel will be in tension as the first frame is being lifted with respect to the second frame.
  • hoist means and hoist actuator may be used which will provide the essential requirement of the invention which is the portion of the hoist means below the hoist actuator being maintained in tension during the lifting of the first frame.
  • the first frame is preferably supported from the upper end of the hoist means so that the second frame can be released to allow it to travel upwardly along the hoist means.
  • the second frame can then be re-supported at a higher level to again cause raising of the first frame.
  • the hoist means are maintained in tension as the second frame is lifted. Accordingly, the invention provides a means of always maintaining the hoisting means in tension as both the first and second frames are lifted vertically.
  • Figures 1 to 3 show three stages of movement of a lifting frame in accordance with the invention
  • Figure 4 shows a plan view of the lifting means shown in Figures 1 to 3.
  • the figures show the lifting frame for a movable screen. For purposes of clarity, the screen elements that are attached to the assembly are not shown in dashed outline.
  • a first frame comprises vertical frame members 11 and horizontal frame members 12.
  • a pair of vertical spindles 13 are secured at each end of the spindle 13 to the vertical frame member 11.
  • I-beams are secured at either end of the beams 15.
  • the I-beams in turn locate within channels which are secured to the vertical frame members 11. In this way, the vertical frame members 11 and the horizontal frame members 12 are held together but are able to slide in relation to one another.
  • the lower horizontal beam 15 carries a motor 17 that drives a gear box 18 that in turn drives a pair of threaded collars 19.
  • the threaded collars 19 engage respective spindles 13 and rotation of the threaded collars 19 via the motor 17 cause the second frame to move with respect to the first as the threaded collars 19 turn with respect to the spindles 13.
  • the first frame carries screen elements that are to be raised as part of a building construction.
  • the second frame is secured to a building in a manner similar to that described in the earlier patent application (PCT/ AU02/00506).
  • the second frame is initially located towards the upper end of each spindle 13.
  • the motor 17 is operated so that the threaded collars 19 rotate with respect to each spindle 13. This in turn moves the spindles 13 upwardly through the collars 19 so that the first frame and screen elements are raised.
  • the first frame can be supported at a different level of the building, preferably by the spindles 13, so that the second frame can be released from the building.
  • the motor 17 is then again operated, but in an opposite direction so that the threaded collars 19 advance upwardly with respect to the spindles 13. This moves the second frame upwardly with respect to the first frame.
  • the second frame reaches the upper end of the spindles 13, it can again be supported with respect to the building so that the first frame can again be raised with respect to the second frame.
  • the invention results in the spindles 13 always having a tensile load applied.
  • the first frame when supported by the second frame, results in those portions of the spindles 13 below the threaded collars 19 being placed in tension.
  • the second frame When the second frame is being lifted, the first frame is supported by the spindles 13 and again a tensile load is applied as a result of the second frame being supported by the spindles 13. This allows any compressive loads to be avoided.
  • first frame can provide a lifting force with respect to the second frame while at the same time providing a means of advancing both the second and first frame upwardly with respect to a supporting structure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Civil Engineering (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)

Abstract

This invention relates to a lifting frame (10) that includes a first frame (11) and a second frame (15) which is slidably attached with respect to the first frame (11). A hoist means (13) extends vertically and is held with respect to the first frame (11). A hoist actuator (19) is mounted on the second frame (15) and operatively engages the hoist means (13) between its ends to cause movement of the first frame (11) with respect to the second frame (15). In use, fixing of the second frame (15) with respect to a fixed support results in the first frame (11) being lifted or lowered with respect to the second frame (15) so that the portion of the hoist means (13) below the hoist actuator (19) is maintained in tension. This ensures that no compressive loads are applied to the hoist means (13) which might otherwise cause bending or bowing of the hoist means (13).

Description

AN IMPROVED LIFTING FRAME
This invention relates to an improved lifting frame, and in particular to ensure the lifting means of the frame are maintained principally in tension.
BACKGROUND OF THE INVENTION
An earlier patent application by the applicant (PCT/AU02/00506), describes a lifting frame used with a moving screen. The preferred application for the moving screen comprises a safety screen used during construction of multi-storey buildings. The description and disclosure of that earlier patent application is hereby incorporated within this specification.
One of the methods described in the earlier patent application for lifting the screen comprises a pair of lead screws or spindles which are operated between two beams, one being a motor beam and the other being a support beam. As the screen is lifted, the two beams come together. The support beam is then secured to the building and the motor beam is released. The motor is operated so that the lead screws push the motor beam upwardly.
It would be preferable that, in addition to the motor beam being lifted, the screen may also be lifted in combination with the motor beam. In other words, the motor beam is secured to the screen so that both raise up in relation to the support beam.
However, one problem with this arrangement is that the spindles would be placed into compression. This is likely to result in bending of the spindles and resultant failure of the lifting mechanism. The spindles may also bend when just lifting the motor beam. Accordingly, it is an object of this invention to overcome the abovementioned problem and to provide a lifting frame where only tensile forces are applied to the spindles.
SUMMARY OF THE INVENTION
In one aspect, the invention is a lifting frame and includes: a first frame; a second frame slidable with respect to said first frame; a hoist means extending vertically and held with respect to said first frame; and a hoist actuator mounted on said second frame that operatively engages said hoist means between its ends to cause movement of said first frame with respect to said second frame where, in use, fixing of said second frame to a fixed support results in said first frame being lifted or lowered with respect to said second frame so that the portion of said hoist means below said hoist actuator is maintained in tension.
In accordance with the invention, the portion of the hoist means that is below the hoist actuator is maintained in tension during the lifting of the first frame. However, the invention also includes the first frame being held with respect to a fixed support. In this case the portion of the hoist means above the hoist actuator is maintained in tension.
A number of different hoist means may be used. For example, the hoist means may comprise one or more elongate threaded spindles that are secured at either end to the first frame. In the case of a threaded spindle, the hoist actuator may comprise a threaded collar which is rotated by an electric motor via associated gearing. The threaded collar is fixed with respect to the second frame and therefore rotation of the threaded collar causes the first frame to move with respect to the second frame. Alternatively, the hoist means may comprise an elongate tooth rack that is fixed to the first frame with the hoist actuator comprising a driven gear wheel which is fixed to the second frame. Again, the portion of the rack below the gear wheel will be in tension as the first frame is being lifted with respect to the second frame.
Other combinations of hoist means and hoist actuator may be used which will provide the essential requirement of the invention which is the portion of the hoist means below the hoist actuator being maintained in tension during the lifting of the first frame.
In operation, once the first frame is lifted to the extent where the hoist actuator reaches the lower end of the hoist means, the first frame is preferably supported from the upper end of the hoist means so that the second frame can be released to allow it to travel upwardly along the hoist means. Once the hoist means reaches the upper end of the hoist actuator, the second frame can then be re-supported at a higher level to again cause raising of the first frame. Again, in this mode of operation, the hoist means are maintained in tension as the second frame is lifted. Accordingly, the invention provides a means of always maintaining the hoisting means in tension as both the first and second frames are lifted vertically.
One application for this invention will be the raising of safety screens the subject of the earlier PCT application (PCT/ AU02/00506). However, this invention is not to be limited to this particular application. Other applications for the invention will be readily apparent to a skilled addressee.
In order for the invention to be fully understood, a preferred embodiment will now be described. However, it should be realised that the invention is not to be confined or restricted to the elements of this particular embodiment. BRIEF DESCRIPTION OF THE DRAWINGS
The embodiment is illustrative in the accompanying drawings in which:
Figures 1 to 3 show three stages of movement of a lifting frame in accordance with the invention, and Figure 4 shows a plan view of the lifting means shown in Figures 1 to 3.
DETAILED DESCRIPTION
The figures show the lifting frame for a movable screen. For purposes of clarity, the screen elements that are attached to the assembly are not shown in dashed outline.
In this embodiment, a first frame comprises vertical frame members 11 and horizontal frame members 12. A pair of vertical spindles 13 are secured at each end of the spindle 13 to the vertical frame member 11.
Referring to Figure 4, I-beams are secured at either end of the beams 15. The I-beams in turn locate within channels which are secured to the vertical frame members 11. In this way, the vertical frame members 11 and the horizontal frame members 12 are held together but are able to slide in relation to one another.
The lower horizontal beam 15 carries a motor 17 that drives a gear box 18 that in turn drives a pair of threaded collars 19. The threaded collars 19 engage respective spindles 13 and rotation of the threaded collars 19 via the motor 17 cause the second frame to move with respect to the first as the threaded collars 19 turn with respect to the spindles 13.
In this embodiment, the first frame carries screen elements that are to be raised as part of a building construction. In this example, the second frame is secured to a building in a manner similar to that described in the earlier patent application (PCT/ AU02/00506). The second frame is initially located towards the upper end of each spindle 13. In order to raise the first frame and attached screen, the motor 17 is operated so that the threaded collars 19 rotate with respect to each spindle 13. This in turn moves the spindles 13 upwardly through the collars 19 so that the first frame and screen elements are raised.
Once the threaded collars 19 reaches the lower end of each of the spindles 13, then the first frame can be supported at a different level of the building, preferably by the spindles 13, so that the second frame can be released from the building. The motor 17 is then again operated, but in an opposite direction so that the threaded collars 19 advance upwardly with respect to the spindles 13. This moves the second frame upwardly with respect to the first frame. Once the second frame reaches the upper end of the spindles 13, it can again be supported with respect to the building so that the first frame can again be raised with respect to the second frame. As can be seen from the above description, the invention results in the spindles 13 always having a tensile load applied. That is, the first frame, when supported by the second frame, results in those portions of the spindles 13 below the threaded collars 19 being placed in tension. When the second frame is being lifted, the first frame is supported by the spindles 13 and again a tensile load is applied as a result of the second frame being supported by the spindles 13. This allows any compressive loads to be avoided.
This embodiment is described in relation to the raising of safety screens in accordance with the prior mentioned patent application. However, the invention will have numerous other applications where the first frame can provide a lifting force with respect to the second frame while at the same time providing a means of advancing both the second and first frame upwardly with respect to a supporting structure.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:
1. A lifting frame including: a first frame; a second frame slidable with respect to said first frame; a hoist means extending vertically and held with respect to said first frame; and a hoist actuator mounted on said second frame that operatively engages said hoist means between its ends to cause movement of said first frame with respect to said second frame where, in use, fixing of said second frame to a fixed support results in said first frame being lifted or lowered with respect to said second frame so that the portion of said hoist means below said hoist actuator is maintained in tension.
2. A lifting frame according to Claim 1 wherein said hoist means comprises a threaded spindle.
3. A lifting frame according to Claim 1 wherein said hoist means comprises a toothed rack.
4. A lifting frame according to Claim 2 wherein said hoist actuator comprises a collar threadably engaging said spindle and a means for driving said collar.
5. A lifting frame according to any one of the preceding claims further comprising a pair of hoist means.
6. A lifting frame according to Claim 5 wherein said pair of hoist means are spaced apart and located on the left and right hand sides respectively of said first frame.
A lifting frame including: a first frame; a second frame slidable with respect to said first frame; a hoist means extending vertically and held with respect to said first frame; and a hoist actuator mounted on said second frame that operatively engages said hoist means between its ends to cause movement of said second frame with respect to said first frame where, in use, fixing of said first frame to a fixed support results in said second frame being lifted or lowered with respect to said first frame so that the portion of said hoist means above said hoist actuator is maintained in tension.
8. A lifting frame according to Claim 7 wherein said hoist means comprises a threaded spindle.
9. A lifting frame according to Claim 7 wherein said hoist means comprises a toothed rack.
10. A lifting frame according to Claim 7 wherein said hoist actuator comprises a collar threadably engaging said spindle and a means for driving said collar.
11. A lifting frame according to any one of the Claims 7 to 10 further comprising a pair of hoist means.
12. A lifting frame according to Claim 11 wherein said pair of hoist means are spaced apart and located on the left and right hand sides respectively of said first frame.
13. A lifting means according to any one of the preceding claims used to lift or lower safety screens on a multi-storey building.
14. A lifting means substantially as herein described with reference to the accompanying drawings.
PCT/AU2003/001065 2002-08-22 2003-08-22 An improved lifting frame WO2004018800A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003250612A AU2003250612B2 (en) 2002-08-22 2003-08-22 An improved lifting frame

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2002951564 2002-08-22
AU2002951564A AU2002951564A0 (en) 2002-08-22 2002-08-22 An improved lifting frame

Publications (1)

Publication Number Publication Date
WO2004018800A1 true WO2004018800A1 (en) 2004-03-04

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ID=28047319

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2003/001065 WO2004018800A1 (en) 2002-08-22 2003-08-22 An improved lifting frame

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AU (1) AU2002951564A0 (en)
WO (1) WO2004018800A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4962828A (en) * 1989-02-21 1990-10-16 Duncan Charles W Debris net/scaffolding frame lifting system
EP0867395A2 (en) * 1997-03-27 1998-09-30 Otis Elevator Company Rope climbing elevator
DE10004151A1 (en) * 2000-01-31 2001-08-02 Franz Kraft Lift for conveyance of persons and loads has lift cage motored upwards or downwards on vertically free hanging spindles, with spindles or spindle nuts being driven

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4962828A (en) * 1989-02-21 1990-10-16 Duncan Charles W Debris net/scaffolding frame lifting system
EP0867395A2 (en) * 1997-03-27 1998-09-30 Otis Elevator Company Rope climbing elevator
DE10004151A1 (en) * 2000-01-31 2001-08-02 Franz Kraft Lift for conveyance of persons and loads has lift cage motored upwards or downwards on vertically free hanging spindles, with spindles or spindle nuts being driven

Also Published As

Publication number Publication date
AU2002951564A0 (en) 2002-10-03

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