WO1987002914A1 - Personnel hoist - Google Patents
Personnel hoist Download PDFInfo
- Publication number
- WO1987002914A1 WO1987002914A1 PCT/GB1986/000701 GB8600701W WO8702914A1 WO 1987002914 A1 WO1987002914 A1 WO 1987002914A1 GB 8600701 W GB8600701 W GB 8600701W WO 8702914 A1 WO8702914 A1 WO 8702914A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mast
- hoist
- platform
- pieces
- piece
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
- B66B9/02—Kinds or types of lifts in, or associated with, buildings or other structures actuated mechanically otherwise than by rope or cable
- B66B9/022—Kinds or types of lifts in, or associated with, buildings or other structures actuated mechanically otherwise than by rope or cable by rack and pinion drives
-
- 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
Definitions
- This invention relates to a personnel hoist which can be used by one or more persons who, for example, need to gain access to parts of buildings or equipment disposed above ground level or who may alternatively require a raised platform for other purposes such as for observation or signalling.
- Personnel hoists of this kind are known in which the platform is connected to a telescopic mast and the platform is lifted by a wire rope or chain and pulley mechanism which may itself be actuated manually or electrically or by hydraulically actuated piston and cylinder units.
- a wire rope or chain and pulley mechanism which may itself be actuated manually or electrically or by hydraulically actuated piston and cylinder units.
- Such an arrangement especially where a wire rope is employed, is prone to wear and accordingly has to be subjected to a careful inspection and maintanence program if a high level of safety is to be maintained in operation. Also, considerable frictional forces arise in the operation of pulley mechanisms.
- Known personnel hoists are usually constructed so that they can raise the platform only to a maximum predetermined height and they cannot easily be altered to raise the platform to a greater height at a later stage.
- a personnel hoist comprising a ground engaging base, a mast extending upwardly from the base and a platform which is connected to the mast, characterised in that the mast comprises at least two pieces, a rack section being provided on one side of each mast piece and the upper end of a mast piece being adapted to be connected to the lower end of another mast piece in a longitudinally aligned relationship in which the rack sections of the aligned mast pieces form a continuous rack, and the hoist further comprises a support member connected to the platform, a pinion mounted on the support member for engaging the rack sections, means for rotating the pinion, and means for preventing unintentional descent of the platform relative to the mast.
- the platform is lifted by a rack and pinion mechanism and such a mechanism is not prone to wear to the same degree as a wire rope or chain and pulley mechanism.
- the height to which the platform can be raised may be increased by adding further mast pieces.
- the means for rotating the pinion comprises at least one handle connected to the pinion and manually rotatable by a user standing on the platform of the hoist.
- the hoist can be operated readily by the user and this removes the necessity to provide electrical or hydraulic apparatus to operate the hoist.
- each mast piece is formed as a tube of generally square or rectangular configuration, and said mast includes at least one connecting member for connecting each pair of adjoining mast pieces together.
- each mast piece is formed as a tube, a safe and rigid structure is obtained.
- Figure 1 is a perspective view of the lower part of a personnel hoist embodying this invention
- Figure 2 is a perspective view of the lower part of the hoist with the legs in a folded position
- Figure 3 is perspective view of the middle part of the hoist
- Figure 4 is horizontal sectional view of the hoist through a pinion forming part of the hoist mechanism
- FIG. 5 is a fragmentary side view of the hoist, partly in section on the line 5-5 of Figure 4;
- Figure 6 is a fragmentary sectional view on the line 6-6 of Figure 5.
- the hoist includes a base generally indicated by the reference number 10 from which a mast 11 extends upwardly.
- the base is provided with four legs 12, 13, 14 and 15, which are provided with ground engaging wheels 16.
- Each of the legs 12 to 15 is provided with an extension 17.
- Each extension 17 carries a foot 18 which can be adjusted by a screwing action in order that its lower end can engage the ground.
- the extension pieces 17 can be held in their extended positions by pins 20. With each of the extensions 17 in their extended positions and with all the feet 18 engaging the ground, the base 10 provides a very stable mounting for the mast 11.
- the leg 12 is rigidly secured to the mast 11 whilst the legs 15 and 17 are connected to mast 11 by hinges 22.
- the legs 15 and 17 are also connected to stays 23, the upper ends of which are connected to mast 11 by hinges 24.
- the legs 15 and 17 are also connected to the leg 12 by a pair of stays 25, 26, which are hinged in the middle.
- the stays 25, 26 can be held in their open position by a tube 28.
- the tube 28 for the stay 26 is omitted in order to show the hinge at its middle.
- the leg 12 is connected to the mast 11 by a stay 29.
- the leg 14 is connected to the mast 11 by a hinge, not shown, which permits this leg either to be held rigidly in the open position or folded under the mast 11.
- the legs 12 to 15 can be arranged in a folded manner for storage or transport of the hoist.
- FIG. 3 there is shown the middle part of the hoist together with a platform or cage, generally indicated by the reference numeral 30, in which the user of the hoist can stand.
- the platform 30 On one side, the platform 30 is connected to a box section 31.
- the box section 31 At its upper end, the box section 31 is connected to the operating mechanism for the hoist and which is generally indicated by reference numeral 32.
- the operating mechanism 32 will be described in more detail below.
- the mast is formed from a number of mast pieces.
- the mast is formed from five mast pieces but, in the present example, the mast is formed from three mast pieces and these are denoted by reference numerals lla_, IIJD and lie.
- Each mast piece is conveniently 1.1 metres long.
- Each mast piece is formed as an aluminum extrusion and is formed as a tube of generally rectangular configuration in cross-section. This configuration together with an appropriate choice of dimensions and wall thickness provides the mast pieces with a high moment of inertia. Consequently, the mast 11 has a high resistance to torsional and bending forces with the result that the platform 30 is held in a very stable manner even when it is at the top of the mast 11.
- each pair of mast pieces is connected together by a pair of connecting members.
- the mast pieces lla_ and lib are connected together by a pair of connecting members 40 and 41 and, in Figure 3, the mast pieces llb_ and ll£ are held together by a pair of connecting members 42 and 43.
- the connecting members are received inside the mast pieces and, prior to assembling the mast, each connecting member is secured to one mast piece by a screw.
- the connecting member 43 is secured to the mast piece lie by a screw 44 having a U-shaped handle 45 and the connecting member 42 is connected to the mast piece llb_ by a screw 46 having a U-shaped handle 47.
- one connecting member of each pair is slightly longer than the other. After the mast pieces have been assembled the connecting members are secured in position as will now be described with reference to mast pieces llb_ and lie.
- two opposite sides of mast piece llb_ are provided with trough-shaped recesses 47 and 48 having inwardly convergent sides.
- Each of the connecting members 47 and 48 also has a trough-shaped recess with inwardly convergent sides and the configuration is such that the convergent sides of a connecting member can engage the convergent sides of a respective trough-shaped recess in mast piece llb_.
- Connecting member 42 has an internal nut 49 which receives the screw 46 and connecting member 43 has an internal nut 50 which receives a hardened steel -insert 51.
- the screw 46 Prior to assembly of the mast pieces llb_ and ll£, the screw 46 is positioned so that connecting member 43 can enter mast piece lib.
- screw 46 is rotated so that its end engages the insert 51 and causes the connecting members 42 and 43 to be urged outwardly into engagement with the walls of mast piece 11]D.
- the handle 47 will be in a vertical orientation, and consequently received in recess 48, and so will not interfere with passage of the platform 30.
- mast piece llb_ is provided with a recess 55 having a pair of retaining lips 56.
- a rack section 57 is secured in recess 55 by a pair of screws 59 at each end of the mast section.
- the rack piece 57 is formed from a moulded synthetic resin material such as nylon.
- the operating mechanism 32 will now be described.
- a pair of side plates 61 and 62, and a pair of spacer members 63, 64 are connected to the box section 31 by nut and bolt fasteners 65.
- the other ends of plates 61 and 62 are connected together by a U-shaped end member 66 held in position by nut and bolt fastenings 67.
- a shaft 70 is rotatably mounted in plates 61 and 62 by bearings 71 held in support members 72 and shaft 70 is located axially by a pair of spacer members 73.
- the shaft 70 carries a pinion 74 which engages rack section 57.
- the diameter of shaft 70 on each side of pinion 74 is identical to the pitch circle diameter of pinion 74 and these parts of shaft 70 engage the face of mast piece llb_ on each side of recess 55 thereby acting as rollers.
- a handle 80 is connected to one end of shaft 70 by a connecting plate 81 and bolt 82.
- a handle 83 together with a pulley 84 is connected to the other end in a manner to be described below.
- the end of shaft 70 adjacent handle 83 is provided with a screw thread which is engaged by a stepped braking member 85 and a further braking member 86.
- a toothed wheel 87 and a pair of annular brake pads 88 are rotatably mounted on the smaller diameter portion of braking member 85.
- the braking member 86 is secured to the handle 83 of pulley 84 by bolts 89.
- a pawl 90 pivotally mounted on side plate 62.
- the pawl 90 has a tooth 91 which is biased into engagement with the toothed wheel 87 by a torsion spring 92. Under the action of spring 92, pawl 90 permits the toothed wheel 87 to rotate in one direction only.
- the pawl 90 is provided with a second tooth 93 which rides over the teeth of wheel 87. If spring 92 fails, the tooth 93 ensures that tooth 91 engages the teeth of wheel 87.
- Braking members 85 and 86, wheel 87, pads 88 and pawl 90 together from a braking mechanism and this mechanism is enclosed by a cover 94.
- a pair of rollers 100 and 101 are rotatably mounted at vertically spaced positions on box section 31.
- the roller 100 is mounted on a hollow shaft 102 held in position by a pair of bolts 103 and roller 101 is mounted in a similar manner.
- Apertures are cut in box section 31 through which rollers 100 and 101 protrude. These rollers engage a rectangular recess in a side of mast 11, the recess in mast piece llb_ being indicated by reference numeral 105.
- the roller 101 keeps the pinion 74 in engagement with the rack and the roller 101 is kept in contact with the mast 11 by the weight of the user standing on platform 30.
- the legs of the base 10 are opened out and the platform 30 is positioned on mast piece lla_.
- the user positions as many mast pieces as may be required on platform 30 and operates handles 80 and 83 until the hoisting mechanism 83 approaches the top of mast piece 11a.
- the user connects the next mast piece to the top of mast piece 11a and operates the handles until he reaches the top of this next mast piece. Assembly is continued in this fashion until all desired mast pieces have been connected together. Whilst assembling the hoist, the mast pieces can, if desired, be stored in some suitable 'container or brackets connected to platform 30.
- the personnel hoist is relatively inexpensive to construct and it provides a safe and strong structure for lifting a platform or cage to any desired height.
- the pinion 74 is operated by the handles 80 and 83, but, if desired, a power operated mechanism may be supplied for rotating this pinion.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Automation & Control Theory (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Types And Forms Of Lifts (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB858528473A GB8528473D0 (en) | 1985-11-19 | 1985-11-19 | Personell hoist |
GB8528473 | 1985-11-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1987002914A1 true WO1987002914A1 (en) | 1987-05-21 |
Family
ID=10588443
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1986/000701 WO1987002914A1 (en) | 1985-11-19 | 1986-11-13 | Personnel hoist |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0247115A1 (en) |
AU (1) | AU6621286A (en) |
GB (1) | GB8528473D0 (en) |
WO (1) | WO1987002914A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2299980A (en) * | 1995-04-18 | 1996-10-23 | Robert Yelbeck | Powered Ladder |
FR2774370A1 (en) * | 1998-02-03 | 1999-08-06 | Alain Pernot | Load handling and lifting device |
FR2863263A1 (en) * | 2003-12-04 | 2005-06-10 | Gay Eurl Bureau Et | Person elevating device for cleaning glass, has unit for sliding elevation unit on sliding unit, where sliding is controlled by person and elevation unit with chariot having belt which is attached to user |
WO2009145637A1 (en) * | 2008-05-26 | 2009-12-03 | Noracon As | Access system, a method of assembly, a support element, a guiding element and an extruded profile for the system |
GB2549924A (en) * | 2016-03-09 | 2017-11-08 | Power Towers Ltd | Elevating platform |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2605937B (en) * | 2020-10-16 | 2023-12-20 | David Brown Michael | Height adjustable platform |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE11677C (en) * | H. BAUM in Breslau, Salzstrafse 2/4 | Mobile scaffolding for structural purposes | ||
FR467273A (en) * | 1914-01-13 | 1914-06-08 | Jean Ferrero | Mobile height adjustable platform for construction workshops and other applications |
US1442075A (en) * | 1921-11-09 | 1923-01-16 | Abel M Knechtel | Scaffold hoist |
FR683354A (en) * | 1929-03-12 | 1930-06-11 | construction scaffolding | |
US2035294A (en) * | 1933-12-15 | 1936-03-24 | Nolan S Black | Portable hoisting machine |
FR1415335A (en) * | 1964-12-01 | 1965-10-22 | Improvements to scaffolding fitted with a self-lifting mobile bridge and made up of prefabricated elements capable of being interconnected in an easily removable manner | |
US3313376A (en) * | 1965-09-01 | 1967-04-11 | Sr Warren L Holland | Lightweight elevator |
US4015686A (en) * | 1973-01-29 | 1977-04-05 | Bushnell Jr Sherman W | Portable multi-stage mechanical list |
US4078633A (en) * | 1976-02-09 | 1978-03-14 | Fahy Michael B | Modular staging with platform jacks |
FR2532927A1 (en) * | 1982-09-11 | 1984-03-16 | Access Eng Ltd | VERTICALLY DISPLACABLE WORK PLATFORM |
-
1985
- 1985-11-19 GB GB858528473A patent/GB8528473D0/en active Pending
-
1986
- 1986-11-13 WO PCT/GB1986/000701 patent/WO1987002914A1/en not_active Application Discontinuation
- 1986-11-13 EP EP19860906876 patent/EP0247115A1/en not_active Ceased
- 1986-11-13 AU AU66212/86A patent/AU6621286A/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE11677C (en) * | H. BAUM in Breslau, Salzstrafse 2/4 | Mobile scaffolding for structural purposes | ||
FR467273A (en) * | 1914-01-13 | 1914-06-08 | Jean Ferrero | Mobile height adjustable platform for construction workshops and other applications |
US1442075A (en) * | 1921-11-09 | 1923-01-16 | Abel M Knechtel | Scaffold hoist |
FR683354A (en) * | 1929-03-12 | 1930-06-11 | construction scaffolding | |
US2035294A (en) * | 1933-12-15 | 1936-03-24 | Nolan S Black | Portable hoisting machine |
FR1415335A (en) * | 1964-12-01 | 1965-10-22 | Improvements to scaffolding fitted with a self-lifting mobile bridge and made up of prefabricated elements capable of being interconnected in an easily removable manner | |
US3313376A (en) * | 1965-09-01 | 1967-04-11 | Sr Warren L Holland | Lightweight elevator |
US4015686A (en) * | 1973-01-29 | 1977-04-05 | Bushnell Jr Sherman W | Portable multi-stage mechanical list |
US4078633A (en) * | 1976-02-09 | 1978-03-14 | Fahy Michael B | Modular staging with platform jacks |
FR2532927A1 (en) * | 1982-09-11 | 1984-03-16 | Access Eng Ltd | VERTICALLY DISPLACABLE WORK PLATFORM |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2299980A (en) * | 1995-04-18 | 1996-10-23 | Robert Yelbeck | Powered Ladder |
FR2774370A1 (en) * | 1998-02-03 | 1999-08-06 | Alain Pernot | Load handling and lifting device |
FR2863263A1 (en) * | 2003-12-04 | 2005-06-10 | Gay Eurl Bureau Et | Person elevating device for cleaning glass, has unit for sliding elevation unit on sliding unit, where sliding is controlled by person and elevation unit with chariot having belt which is attached to user |
WO2009145637A1 (en) * | 2008-05-26 | 2009-12-03 | Noracon As | Access system, a method of assembly, a support element, a guiding element and an extruded profile for the system |
EP2282962A1 (en) * | 2008-05-26 | 2011-02-16 | Noracon AS | Access system, a method of assembly, a support element, a guiding element and an extruded profile for the system |
CN102046510A (en) * | 2008-05-26 | 2011-05-04 | 诺拉康公司 | Access system, a method of assembly, a support element, a guiding element and an extruded profile for the system |
US20110120801A1 (en) * | 2008-05-26 | 2011-05-26 | Noracon As | Access system, a method of assembly, a support element, a guiding element and an extruded profile for the system |
CN102046510B (en) * | 2008-05-26 | 2013-12-11 | 诺拉康公司 | Access system, a method of assembly, a support element, a guiding element and an extruded profile for the system |
EP2282962A4 (en) * | 2008-05-26 | 2014-06-11 | Noracon As | Access system, a method of assembly, a support element, a guiding element and an extruded profile for the system |
US8905190B2 (en) | 2008-05-26 | 2014-12-09 | Noracon As | Access system, a method of assembly, a support element, a guiding element and an extruded profile for the system |
GB2549924A (en) * | 2016-03-09 | 2017-11-08 | Power Towers Ltd | Elevating platform |
Also Published As
Publication number | Publication date |
---|---|
GB8528473D0 (en) | 1985-12-24 |
AU6621286A (en) | 1987-06-02 |
EP0247115A1 (en) | 1987-12-02 |
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