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Title:
HOIST DEVICE COMPRISING A LINEAR ACTUATOR WITH A MANUAL LOWERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/042048
Kind Code:
A4
Abstract:
This invention relates to a hoist device comprising a linear actuator, said linear actuator (6) comprising an electric motor drive (5), an outer tube (7) and an inner tube (8) that is axially movable in an out of the outer tube (7), said hoist device (1, 13, 12) comprising a lifting arm (1) and a frame structure (12, 13), wherein said lifting arm (1) is pivotally attached to said frame structure (12, 13) and said linear actuator (6) is pivotally attached at one end to said frame structure (12, 13) and at a second end to said lifting arm (1), wherein further a manual lowering device (9) arranged to enable lowering of said lifting arm (1) without use of said motor drive (5), said lowering device (9) being connected between the outer end of the inner tube (8) and an attachment device (10) of said lifting arm (1), said manual lowering device (9) comprising a stationary part (22), a rotatable part (23), a coupling (24) and a manually an operated transmission device (20, 21), wherein said stationary part (22) includes a first threaded member (201D, 319B), preferably in the form of a stub shaft, and said rotatable part (23) is connected to a threaded, clamp activating second threaded member (215, 315), preferably in the form of a nut device, interacting with said first threaded member (201D, 319B), wherein the axial position of said clamp activating second threaded member (215, 315) is arranged to control said coupling (24) to be in engaged or disengaged state and wherein said manually operated transmission device (20, 21) is arranged to control the axial position of said clamp activating second threaded member (215, 315).

Inventors:
OLSSON JOHAN (SE)
Application Number:
EP2017/072173
Publication Date:
April 26, 2018
Filing Date:
September 05, 2017
Export Citation:
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Assignee:
REAC AB (SE)
International Classes:
B66C23/48; A61G7/10; F16H25/24; F16H25/20
Attorney, Agent or Firm:
HYNELL PATENTTJĂ„NST AB (HAGFORS, SE)
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Claims:
AMENDED CLAIMS received by the International Bureau on 08 March 2018 (08.03.2018)

A hoist device comprising a linear actuator, said linear actuator (6) comprising an electric motor drive (5), an outer tube (7) and an inner tube (8) that is axially movable in an out of the outer tube (7),

said hoist device (1, 13, 12) comprising a lifting arm (1) and a frame structure (12, 13), wherein said lifting arm (1) is pivotally attached to said frame structure (12, 13) and said linear actuator (6) is pivotally attached at one end to said frame structure (12, 13) and at a second end to said lifting arm (1),

wherein further a manual self-locking lowering device (9) is arranged to enable lowering of said lifting arm (1) without use of said motor drive (5), said manual self-locking lowering device (9) being connected between the outer end of the inner tube (8) and an attachment device (10) of said lifting arm (1), said manual self- locking lowering device (9) comprising a stationary part (22), a rotatable part (23), a coupling (24) and a manually operated transmission device (20, 21),

c h ar a ct e ri z e d i n that said stationary part (22) includes a first threaded member (20 ID, 319B), preferably in the form of a stub shaft, and that said rotatable part (23) is connected to a threaded, clamp activating second threaded member (215, 315), preferably in the form of a nut device, interacting with said first threaded member (201D, 319B), wherein said manually operated transmission device (20, 21) is arranged to control the axial position of said clamp activating second threaded member (215, 315) enabling the clamp activating second threaded member (215, 315) to untighten allowing for rotational movement of the rotatable part (23), preferably including a bearing (205, 305) between said stationary part (22) and said rotatable part (23) facilitating rotational movement between the stationary part (22) and the rotational part (23) at a relatively low friction.

A hoist device according to claim ^ c h ar a ct e ri z e d i n that said manually operated transmission device (20, 21) includes a manual maneuvering part (20) and a planetary gear (21) having a plurality of planetary gears (209) and a sun gear wheel (214) that is interlocked with said clamp activating second threaded member (215,315).

A hoist device according to claim 2, c h ar a ct e ri z e d i n that said plurality planetary gears (209) interfit with a dented wheel (208) arranged on the manual maneuvering part (20), wherein preferably said manual maneuvering part (20) includes a gripable knob (204) having said dented wheel (208) integrated therewith.

4. A hoist device according to any of claims 1-3, characterized in that said coupling (24) is in the form of a stack of discs (316, 317).

5. A hoist device according to any of claims 1-3, characterized in that said coupling (24) is in the form of frustoconical surfaces (216, 201G).

6. A hoist device according to any preceding claim, characterized in that said rotatable part (23), includes an axial thrust bottom plate (211,311) arranged to support an axial thrust sleeve (207) arranged to transfer thrust and to provide space for a transmission (21).

7. A hoist device according to claim 6, characterized in that said axial thrust bottom plate (211,311) also rotatably supports at least one member of said transmission (21).

8. A hoist device according to any preceding claim, characterized in that there is arranged a bearing (205, 305) between said stationary part (22) and said rotatable part (23) arranged to provide for easy maneuvering of the manually operated transmission device (20, 21), preferably in the form of a sliding bearing.

9. A hoist device according to any preceding claim, characterized in that the manually operated transmission device (20, 21) forms a housing arranged to enclose at least most of the parts of the lowering device (9).

10. Method for operating a hoist device, said hoist device comprising a linear actuator (6) including an electric motor drive (5), an outer tube (7) and an inner tube (8) that is axially movable in an out of the outer tube (7),

said hoist device (1, 13, 12) comprising a lifting arm (1) and a frame structure (12, 13), wherein said lifting arm (1) is pivotally attached to said frame structure (12, 13) and said linear actuator (6) is pivotally attached at one end to said frame structure (12, 13) and at a second end to said lifting arm (1),

wherein further a manual self-locking lowering device (9) enables lowering of said lifting arm (1) without use of said motor drive (5), said lowering device (9) being connected between the outer end of the inner tube (8) and an attachment device (10) of said lifting arm (1), said manual self-locking lowering device (9) comprising a stationary part (22), a rotatable part (23), a coupling (24) and a manually operated transmission device (20, 21), c h ar a c t e ri z e d b y said stationary part (22) including a first threaded member (20 ID, 319B), preferably in the form of a stub shaft, and by having said rotatable part (23) connected to a threaded, clamp activating second threaded member (215, 315), preferably in the form of a nut device, interacting with said first threaded member (20 ID, 319B), wherein the axial position of said clamp activating second threaded member (215, 315) controls said coupling (24) to be in engaged or disengaged state and wherein said manually operated transmission device (20, 21) controls the axial position of said clamp activating second threaded member (215, 315), causing the clamp activating second threaded member (215, 315) to untighten allowing for rotational movement of the rotatable part (23).

11. Method according to claim 10, wh e r e i n said manually operated transmission device (20, 21) includes a manual maneuvering part (20) and a planetary gear (21) having a plurality of planetary gears (209) and a sun gear wheel (214) that interlocks with said clamp activating second threaded member (215,315).

12. Method according to claim 11, wh e r e i n said plurality of planetary gears (209) interfit with a dented wheel (208) arranged on the manual maneuvering part (20), wherein preferably said manual maneuvering part (20) includes a gripable knob (204) having said dented wheel (208) integrated therewith.

13. Method according to claim 10, 11 or 12, w h e r e i n said engaged, coupled state is achieved by pressing a stack of discs (316, 317) into gripping contact.

14. Method according to any of claims 10-13, wherein said rotatable part (23) includes an axial thrust bottom plate (211, 311) that supports an axial thrust sleeve (207) that transfers thrust and provides space for a transmission (21).

15. Method according to any of claims 10-13, wherein a bearing (205, 305) between said stationary part (22) and said rotatable part (23) arranged to ensure that the rotatable part (23) rotates and thereby tightens the activating nut (315) throughout a wide range of loads and resulting torques, preferably in the form of a sliding bearing, and more preferred wherein a further low friction member (325) is arranged between said stationary part (22) and said rotatable part (23).