The invention relates to a lifting fork for lifting pallets, panels, panel stacks, and the like, and comprises a fork carrier, the lower end of which supports lifting prongs, and the upper end of which is attachable to a linking piece which has a pendulous axis for the pendulous mounting of the lift
The invention relates to a lifting fork for lifting pallets, panels, panel stacks, and the like, and comprises a fork carrier, the lower end of which supports lifting prongs, and the upper end of which is attachable to a linking piece which has a pendulous axis for the pendulous mounting of the lifting fork. According to the invention, the lifting fork is distinguished by the fact that a swivel device is provided by which all the lifting prongs are able to be swiveled, in the unloaded state, about a common axis which is located parallel to the pendulous axis of the linking piece and parallel to the insertion direction in which the lifting prongs are insertable under a pallet, panels, or a panel stack, or the like.
대표청구항▼
The invention claimed is: 1. Lifting fork configured to lift pallets, panels or panel stacks, comprising a fork carrier (1) having a lower end which supports parallel lifting prongs (4, 5) which define a longitudinal direction, and an upper end which is connectable to a linking piece (12), the link
The invention claimed is: 1. Lifting fork configured to lift pallets, panels or panel stacks, comprising a fork carrier (1) having a lower end which supports parallel lifting prongs (4, 5) which define a longitudinal direction, and an upper end which is connectable to a linking piece (12), the linking piece having a pendulous axis (26) to pendulously mount the lifting fork, the lifting prongs defining a surface extending directly from the lower end and being configured to engage the lift pallets, panels or panel stacks, a drive assembly (27) arranged to swivel the lifting prongs (4, 5) in an unloaded state about an axis parallel to and vertically spaced apart from the pendulous axis (26), and which is parallel to the longitudinal direction of the lifting prongs (4, 5), the drive assembly including a first beam connected to the fork carrier (1) and a second beam connected to the linking piece (12), wherein the first beam and the second beam each define a U-shaped cross-section having different widths respectively, the U-shaped cross-sections being disposed in opposing relation to telescopically couple the first beam and the second beam such that the first beam movably engages the second beam to move the fork carrier (1) relative to the linking piece (12) along a travel axis (28) disposed perpendicular to the pendulous axis (26). 2. Lifting fork according to claim 1, wherein the drive assembly comprises a traversing drive (19) disposed between the first beam and the second beam, the traversing drive being engageable with the first beam and the second beam in a configuration to move the fork carrier (1) relative to the linking piece (12) along the travel axis (28). 3. Lifting fork according to claim 2, wherein the traversing drive (19) is of an hydraulically operating design and has a piston cylinder unit (20) located parallel to the travel axis (28) and disposed for engagement with the first beam. 4. Lifting fork according to claim 3, further comprising a swivel drive (7) structured and arranged to swivel the lifting prongs (4, 5) relative to the fork carrier (1) about a swivel axis (8) parallel to the travel axis (28). 5. Lifting fork according to claim 2, further comprising a swivel drive (7) structured and arranged to swivel the lifting prongs (4, 5) relative to the fork carrier (1) about a swivel axis (8) parallel to the travel axis (28). 6. Lifting fork according to claim 1, wherein the first beam is a first sliding guide piece connected to the fork carrier (1) and the second beam is a second sliding guide piece connected to the linking piece (12), the first sliding guide piece and the second sliding guide piece being configured to form a sliding guide (9) whereby said first and second sliding guide pieces are arranged to slide with respect to one another. 7. Lifting fork according to claim 6, wherein the sliding guide (9) includes a traversing drive (19) disposed between the first beam and the second beam, the traversing drive being engageable with the first beam and the second beam in a configuration to move the fork carrier (1) relative to the linking piece (12) along the travel axis (28). 8. Lifting fork according to claim 7, wherein the traversing drive (19) is of an hydraulically operating design and has a piston cylinder unit (20) located parallel to the travel axis (28) and disposed for engagement with the first beam. 9. Lifting fork according to claim 8, further comprising a swivel drive (7) structured and arranged to swivel the lifting prongs (4, 5) relative to the fork carrier (1) about a swivel axis (8) parallel to the travel axis (28). 10. Lifting fork according to claim 6, further comprising a swivel drive (7) structured and arranged to swivel the lifting prongs (4, 5) relative to the fork carrier (1) about a swivel axis (8) parallel to the travel axis (28). 11. Lifting fork according to claim 1, further comprising a swivel drive (7) structured and arranged to swivel the lifting prongs (4, 5) relative to the fork carrier (1) about a swivel axis (8) parallel to the travel axis (28). 12. Lifting fork according to claim 11, wherein said swivel axis (8) is oriented transversely to a longitudinal direction of both said lifting prongs (4,5) and the fork carrier (1). 13. Lifting fork according to claim 1, wherein said fork carrier (1) is constituted by two beams (2,3) oriented in a V-shape and interconnecting said lifting prongs (4,5) and the drive assembly (27). 14. Lifting fork configured to lift pallets, panels or panel stacks, the lifting fork comprising a fork carrier (1) having a lower end supporting parallel lifting prongs (4, 5) which define a longitudinal direction, and an upper end connectable to a linking piece (12), the linking piece having a pendulous axis (26) to pendulously mount the lifting fork, a drive assembly (27) arranged to swivel the lifting prongs (4, 5) in an unloaded state about an axis parallel to and vertically spaced apart from the pendulous axis (26), and which is parallel to the longitudinal direction of the lifting prongs (4, 5), the drive assembly including a sliding guide (9) provided between the fork carrier (1) and the linking piece (12), the sliding guide having a travel axis (28) orientated perpendicular to the pendulous axis (26) and parallel to a support plane defined by the lifting prongs (4, 5), the sliding guide (9) having a first sliding guide piece connected to the fork carrier (1) and a second sliding guide piece connected to the linking piece (12), said first and second sliding guide pieces being arranged to slide with respect to one another and are constituted respectively by first and second telescoping beams, each of said first and second telescoping beams having an approximately U-shaped cross-section, wherein said first and second telescoping beams have different widths respectively, and are telescopically coupled together such that the U-shaped cross section of the first telescoping beam and the U-shaped cross section of the second telescoping beam are oppositely-oriented with respect to one another, the first and second telescoping beams including respectively externally and internally-projecting guide ridges (17, 18) to telescopically couple said first and second telescoping beams together; and a traversing drive (19) disposed between the first beam and the second beam, the traversing drive being engageable with the first beam and the second beam in a configuration to move the fork carrier (1) relative to the linking piece (12) along the travel axis (28). 15. Lifting fork according to claim 14, wherein the traversing drive (19) comprises an hydraulically-operated piston-cylinder unit (20) having a piston (21) coupled to one (11) of said beams (10, 11) and cylinder (22) coupled to the other of said beams (10, 11). 16. Lifting fork according to claim 15, wherein said traversing drive (19) is structured and arranged to slide said beams (10, 11) with respect to one another such that a center of gravity (25) of the lifting fork remains vertical under the pendulous axis (26) due to gravity and the lifting prongs (4,5) are tilted. 17. Lifting fork according to claim 16, wherein said fork carrier (1) additionally comprises two beams (2,3) oriented in a V-shape and coupled to one (11) of said telescopically-sliding beams (10, 11), a lifting prong carrier (6) supporting said lifting prongs (4,5) and mounted upon said V-shape oriented beams (2,3), and a swivel drive (7) structured and arranged to swivel the lifting prongs (4,5) relative to the fork carrier (1) about a swivel axis (8) parallel to the travel axis (28). 18. A lifting fork configured to lift pallets, panels or panel stacks, the lifting fork comprising: a fork carrier (1) having a lower end which supports longitudinally extending lifting prongs (4,5), and an upper end connectable to a linking piece (12), the linking piece having a longitudinal pendulous axis (26) to pendulously mount the lifting fork, the lifting prongs defining a surface extending directly from the lower end and being configured to engage the lift pallets, panels or panel stacks, wherein the fork carrier includes a drive assembly (27) arranged to swivel the lifting prongs (4,5) in an unloaded state about a longitudinally extending swivel axis parallel to and vertically spaced apart from the pendulous axis (26), and which is parallel to the longitudinal direction of the lifting prongs (4, 5), the drive assembly including a first beam connected to the fork carrier (1) and a second beam connected to the linking piece (12), wherein the first beam and the second beam each define a U-shaped cross-section having different widths respectively, the U-shaped cross-sections being disposed in opposing relation to telescopically couple the first beam and the second beam such that the first beam slidably engages the second beam to move the fork carrier (1) relative to the linking piece (12) along a travel axis (28) disposed perpendicular to the pendulous axis (26); and a traversing drive (19) disposed between the first beam and the second beam, the traversing drive being engageable with the first beam and the second beam in a configuration to slidably move the fork carrier (1) relative to the linking piece (12) along the travel axis (28). 19. A lifting fork configured to lift pallets, panels or panel stacks, the lifting fork comprising: a fork carrier (1) having a lower end supporting parallel lifting prongs (4, 5) that define a longitudinal direction, and an upper end being connectable to a linking piece (12) having a pendulous axis (26) to pendulously mount the lifting fork, the lifting prongs defining a surface extending directly from the lower end and being configured to engage the lift pallets, panels or panel stacks; the upper end including a drive assembly (27) arranged to swivel all lifting prongs (4, 5) in an unloaded state about an axis parallel to and vertically spaced apart from the pendulous axis (26), and which is parallel to the longitudinal direction of the lifting prongs (4, 5); the lower end including a swivel drive (7) configured to swivel the lifting prongs relative to the fork carrier (1) about a swivel axis (8), the swivel axis (8) being oriented perpendicular to the pendulous axis (26), wherein the drive assembly includes a first beam connected to the fork carrier (1) and a second beam connected to the linking piece (12), wherein the first beam and the second beam each define a U-shaped cross-section having different widths respectively, the U-shaped cross-sections being disposed in opposing relation to telescopically couple the first beam and the second beam such that the first beam movably engages the second beam to move the fork carrier (1) relative to the linking piece (12) along a travel axis (28) disposed perpendicular to the pendulous axis (26); and a traversing drive (19) disposed between the first beam and the second beam, the traversing drive being engageable with the first beam and the second beam in a configuration to move the fork carrier (1) relative to the linking piece (12) along the travel axis (28).
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이 특허에 인용된 특허 (14)
Bushong Jimmy Ray ; Bushong Clint Emerson, Automated mechanism to fold and unfold lift truck forks and related process.
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