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
  • 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
  • B66B9/025—Kinds or types of lifts in, or associated with, buildings or other structures actuated mechanically otherwise than by rope or cable by screw-nut drives

Definitions

• the present invention relates to a lift device including a lift shaft and a lift cage movable in said lift shaft, elongated guide means, a supporting frame movable along said guide means, and driving means for moving said supporting frame along said guide means, a pulley rotatably mounted to said sup ⁇ porting frame, the supporting frame being connected with said lift cage by means of at least one lifting cable attached at one end to said lift cage and forming a tackle loop extending over said pulley so that movement of said supporting frame a distance along the guide means, by said tackle loop is trans- formed to a movement of said lift cage a multiple of said distance.
• the sup ⁇ porting frame is movable on guide rails in the ver- ticle direction in said lift shaft, the supporting frame being attached at the upper end of the piston rod of a vertically extending hydraulic cylinder, the opposite end of which being supported on a base structure at the bottom of said lift shaft.
• Ex ⁇ tending or retracting the hydraulic cylinder unit thus causes the supporting frame, to move vertically in the lift shaft, and since the supporting frame is connected with the lift cage by lifting cables form ⁇ ing a loop over a pulley supported on the supporting frame, the lift cage is caused , to move vertically in the lift shaft over the double distance and with the double velocity compared to the movement of the sup ⁇ porting frame.
• the hydraulic cylinder units extends from the bottom of the lift shaft past the lift cage in a re- cess at the side of the lift cage to the supporting frame to which the piston end of the hydraulic cylinder is articulately attached.
• the hydraulic cylinder is supplied with pressure medium from a hydraulic pump unit disposed in a suitable space in the vicinity of the lift shaft. The length of the hydraulic cylinders used is thus considerable since the hydraulic cylinder unit extends from the bottom of the lift shaft past the lift cage up to the supporting frame.
• One object of the present invention is to pro ⁇ vide a lift device of the kind mentioned initially in which the need for hydraulic cylinders and asso- ciated hydraulic pressure units is eliminated.
• An ⁇ other object of the invention is to provide a lift device v ⁇ iich is particularly well adapted to be manufactured, assembled, tested and finished at the factory, to be ready for delivery as a complete lift device including lift shaft, lift cage and associ ⁇ ated drive arrangement, which as a unit may be transported to the building in which the lift device may be installed by lowering the complete unit ver ⁇ tically through an opening in the roof of the build- ing just above the hoist shaft therein.
• fig 1 is a schematic vertical front sectional view of a lift device in accordance with the inven ⁇ tion
• - fig 2 is a schematic sectional side view of the lift device shown in fig 1
• - fig 3 is a schematic sectional view correspond ⁇ ing to fig 1 of a second embodiment according to the invention
• - fig 4 is a schematic sectional side view of the lift device shown in fig 3
• - fig, 5 is a schematic sectional view of a lift device in an alternative embodiment in accordance with the invention
• - fig 6 is a schematic partial view taken as in ⁇ dicated by lines I-I in fig 5
• - fig 7 is a vertical sectional view through the upper portion of the lift shaft and the drive unit in another embodiment according to the invention
• - fig 8 is a partial top view taken as indicated by II-II in fig 7, and
• FIG. 1 - fig 9 is a schematic transverse sectional view through the guide frame of the drive unit shown in fig 7, said transverse section taken as indicated by III-III in fig 7.
• the lift device schematically illustrated in figures 1 and 2 includes a vertical lift shaft 1, preferably having a rectangular cross section.
• the lift shaft 1 includes a supporting frame work, not shown in the figures, said frame work being covered by thin plating so that a closed lift shaft is formed.
• Vertically movable in said lift shaft is a lift cage 2, including a frame work covered with thin plating and preferably sound insulated in a conventional manner.
• One side the lift cage 2 is provided with a vertical recess for the lifting cables of the drive unit.
• the supporting frame 5 includes an upper horizontal frame portion 6 and a lower horizontal frame portion 7 disposed at a distance below said upper frame portions 6, the upper and lower frame portions* 6, 7 being interconnected by means of ver ⁇ tical struts 8.
• Rotatably supported on the upper frame portion 6 is a pulley 9 having a number of parallel pulley grooves for a corresponding number of parallel lifting cables 10, preferably three lifting cables.
• each one of said lifting cables 10 is attached at the upper part of the frame work of the lift cage 2, said lifting cables ex- tending from the lift cage in a direction vertically upwards over the pulley 9 and from this in a direc ⁇ tion vertically downwards to the bottom of the lift shaft, where the lifting cables are attached via equalizing means known per se for equalizing of tensions in order to secure that the tension in each one of said lifting cables is substantially the same.
• the portions of the lifting cables 10 extending to the bottom of the lift shaft thus extend through the recess of the lift cage 2.
• the guide rails 3 and 4 extend from the upper portion of the lift shaft in a direction downwards at least a short distance past half the height of said lift shaft, but may also be extended to the bottom of the lift shaft in case said guide rails are used as guides also for the lift cage 2. This is not necessary, however.
• the lift shaft 1 may instead be provided with separate guide rails (not shown in the figures) for the lift cage.
• the lift arrange- ment described results in that when the supporting frame 5 is caused to move over a certain distance, a movement is also imparted to the lift cage, said lift cage moving in the vertical direction of the lift shaft over the double distance and with the double velocity compared to the movement of the sup ⁇ porting frame 5.
• the * displacement of the supporting frame 5 along the guide rails 3, 4 is obtained by means of a vertical screw spindle 11 extending from the upper part of the lift shaft in the • vertical direction downwards over a distance which is somewhat greater that half the height of the lift shaft.
• the screw spindle 11 is rigidly secured in the upper part of said lift shaft and cooperates 'positively with a nut 12 supported by the supporting frame 5 and being rotatively attached to said supporting frame.
• the nut 12 is provided with a gear ring 13 positively engaging a pinion 14 which is rotatably driven by a drive motor 15. When driving the electrical motor 15 and thus causing the pinion to rotate, the nut 12 also rotates, at the same time being displaced ver ⁇ tically along the screw spindle 11.
• the nut 12 and thus also the supporting frame 5 is caused to move in a direction upwards.
• the lift cage 2 supported by the supporting frame 5 via lifting cables 10 is thus caused to move in a direction up ⁇ wards with the double velocity compared to the vel ⁇ ocity of said supporting frame. If the electrical motor 15 is made to rotate in the opposite direc ⁇ tion, the direction of movement of the frame and thus of the lift cage is the opposite.
• the lift shaft 1 and the lift cage 2 are nat ⁇ urally in a conventional manner provided with lift doors and lift door openings disposed just opposite and in level with the respective floor plan of the building in which the lift device is to be in ⁇ stalled, and further in a conventional manner equipped with an electrical control system for con- trol of the driving of the lift device and of the stop positions just in level with the desired floor plan.
• Figures 3 and 4 illustrate very schematically a modification of the embodiment illustrated in fig- ures 1 and 2.
• the embodiment according to figures 3 and 4 differs from the embodiment shown in figures 1 and 2 mainly in that the screw spindle 16 disposed vertically in the lift shaft is rotatably supported at the upper end of the lift shaft, and is driven by means of an electrical gear motor drive for rotation about its longitudinal axis.
• the nut is rigidly secured to the supporting frame 5.
• the lift device construction corre ⁇ sponds to the embodiment described in connection with figures 1 and 2.
• the movement of the supporting frame 5 along the guide rail 3 and 4, and thus the movement of the lift cage 2 in the lift shaft is obtained by driving the electrical drive motor, which via the gear 17 causes the screw spindle 16 to rotate either in a direction for lifting the supporting frame 5 and thus the lift cage 2 or in a direction for lowering of supporting frame and lift cage.
• FIGS 5 and 6 very schematically illustrate an alternative embodiment of the lift " device in ac ⁇ cordance with the invention.
• this embodiment corre ⁇ sponds to the embodiments previously described.
• the main difference is that the screw spindle has been replaced by two racks 19, 20 rigidly mounted on each one of guide rails 3, 4 respectively.
• Mounted on the supporting frame 5 adjacent each one of guide rails 3, 4 is an electric drive motor 21, 22 respectively, for driving a pinion 23, 24 which permanently en ⁇ gages rack 19 and 20 respectively.
• Synchronous driving of electrical motors 21, 22 thus causes pin ⁇ ions 23, 24 to rotate and consequently to move in a direction upwards or downwards along said racks, de- pending of the rotational direction of drive motors 21, 22.
• Drive motors 21, 22, which are rigidly at ⁇ tached to the supporting frame 5, are thus caused to move together with the supporting frame in the ver ⁇ tical direction and thus, in • the manner previously described, causing the lift cage to move vertically in the lift shaft with the double velocity of the supporting frame 5.
• Figures 7-9 illustrate a furhter embodiment of the invention *
• the main difference compared with the embodiments previously described is that the guides, the supporting frame, drive rod, drive element and drive means are assembled to form a separate drive unit entirely disposed at a level above the lift shaft, said drive unit being designed so as to im- part to the lift cage a movement in the lift shaft which corresponds to the movement of the supporting frame along the guide frame multiplied by three.
• the drive unit 25 comprises a main frame formed by guide rails 3, 4 and girders 26, 27, e.g. in the form of elongated tubes with square section, which are disposed in the corners of a rectangel, as seen in fig 9.
• the guide rails 3, 4 and the girders 26, 27 are interconnected by a number of rectangular frame sections 28 equally spaced to form an elongated frame for said drive unit 25.
• the guide rails 3, 4 are disposed diagonal ⁇ ly opposite each other for guiding cooperation with the supporting frame 29 by engagement with guiding blocks 30 disposed on said supporting frame.
• the supporting frame 29 is thus movable along said guide rails 3, 4. Rotatably supported on said supporting frame is «a pulley 9 for lifting cables 10.
• the drive unit 25 is disposed with one end just above and op ⁇ posite the upper opening of the vertical lift shaft 1 as best seen in fig 7.
• Rotatably supported at this end of the drive unit 25 are two intermediate pul ⁇ leys 31, 32, one of said intermediate pulleys 31 de ⁇ viating the lifting cables 10 towards the pulley 9 supported on the supporting frame 29, said lifting cables further extending over said pulley 9 to form a tackle loop.
• From the pulley 9 the lifting cables further extend to and over the second intermediate pulley 32 to form a second tackle loop, the lifting cables extending back to the supporting frame, to which the ends of the lifting cables are fixedly attached by an attachment 33.
• a drive element in the form of a nut 34 which positively engages an elongated screw spindle 35 extending through said nut 34 and being rotatably supported by a thrust bearing 36 at the end of the drive unit 25 which faces away from the lift shaft.
• the thrust bearing 36 in turn is supported by a yoke 37 interconnecting the girders 26, 27 at the ends thereof.
• the screw spindle 35 is connected to an electrical gear drive motor 38 by means of a coupling 39.
• the drive unit 25 extends substantially perpendicularly with respect to the lift shaft.
• the drive unit 25 may, however, extend in any desired inclination with respect to the lift shaft, including an arrangement in which the drive unit 25 extends axially above the lift shaft 1, or an arrangement in which the drive unit 25 extends close to and in parallel with the upper part of the lift shaft and having the end. which is provided with said intermediate pulleys 31, 32 disposed close to the upper opening of the lift shaft.
• an additional intermedi ⁇ ate pulley should be arranged for deviating the lift cables 10 from the lift cage 2 over said additional pulley to said intermediate pulleys 31, 32 at the end of the drive unit and further to the pulley 9 on the supporting frame 29.
• the screw spindle used in the embodiments according to figures 1, 2, 3, 4, and 7-9 may be of the self-breaking type or the non-self-breaking type. In the latter case the driving means of the lift should be provided with a brake which is automatically actuated in case of interruption in electricity supply to the elec ⁇ trical drive motor.
• the embodiments according to figures 5 and 6 include two racks and two synchron- ously driven electrical motors. Said drive arrange ⁇ ment may instead include only one rack and one elec ⁇ trical dsive motor including a pinion positively en ⁇ gaging said rack.
• the lift device should be provided with a brake which is automatically actuated in case of interruption in electricity supply to the drive motor.
• the lift ⁇ ing cables 10 and the pulleys 9, 31, 32 are arranged so that the resulting movement' of the lift cage 2 is a multiple by two or three of the movement of the supporting frame 6, 29 along the guide rails 3, 4.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Automation & Control Theory (AREA)
• Structural Engineering (AREA)
• Types And Forms Of Lifts (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=20363547

Family Applications (1)

Country Status (4)

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• 1986
  • 1986-02-21 SE SE8600788A patent/SE451996B/sv not_active IP Right Cessation
• 1987
  • 1987-02-19 EP EP19870901718 patent/EP0294385A1/de not_active Withdrawn
  • 1987-02-19 WO PCT/SE1987/000082 patent/WO1987004999A1/en not_active Application Discontinuation
• 1988
  • 1988-08-19 FI FI883866A patent/FI883866A0/fi not_active IP Right Cessation

Non-Patent Citations (1)

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