Gangway structure with lifting device

Abstract

To provide a lifting device structure capable of automatically rotating and lifting a gangway footplate with a simple configuration and reducing impact caused when placing the gangway footplate on a load transfer surface of a truck and the like.SOLUTION: A gangway footplate structure attached to a lifting device includes: a rotation shaft 25 provided on an end part of a table part 10; a gangway footplate 20 whose base part 26 is connected to the rotation shaft 25 to be rotatable around the rotation shaft 25; a torsion spring 24 provided on the rotation shaft 25; and a flip-up roller 31 provided on an upper end part of a support column 30 provided to extend in a vertically upper direction from a bottom part of a pit 40. When the table part 10 is lowered, the flip-up roller 31 is brought into contact with a gangway footplate lower surface 22 to press it. The gangway footplate 20 is rotated such that a tip part 27 of the gangway footplate 20 is moved in the vertically upper direction. When the table part 10 is moved up, the flip-up roller 31 is separated from the gangway footplate lower surface 22 and the gangway footplate 20 is rotated such that the tip part 27 of the gangway footplate 20 is moved in a vertically lower direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a structure of a gangway attached to a lifting device. [Background technology]

[0002] Known conventional lifting device structures include, for example, the lifting device structure described in Patent Document 1. The lifting device structure described in Patent Document 1 is installed, for example, on a platform of a warehouse equipped with a truck yard, and can load cargo onto a flat table section, and raise and lower the table section to raise and lower the cargo to the height of the bed of a truck or the like.

[0003] In such a lifting device, a gangway is necessary to transfer cargo from the table of the lifting device to the loading platform of a truck or the like, and a configuration in which such a gangway is provided on the table of a lifting device structure as described in Patent Document 1 is generally known. In addition, a shutter is generally installed between the warehouse platform and the warehouse building, and the above-mentioned gangway attached to the lifting device installed near the shutter is required to be storable when not in use. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-155659 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when using a gangway in the lifting device structure described in Patent Document 1, when placing or storing the gangway on the cargo transfer surface of the platform of a truck or the like, the gangway is generally made of stainless steel or the like because it is required to be strong, and the worker must manually rotate the gangway, which places a heavy burden on the worker. Another problem is that the impact when the gangway is placed on the cargo transfer surface of the truck or the like is large.

[0006] The present invention has been made to solve such problems, and has an object to provide a gangway structure attached to a lifting device that can automatically rotate and lift the gangway with a simple configuration without using power such as hydraulics, pneumatics, or electricity, and that can reduce the impact when the gangway is placed on a cargo transfer surface such as a truck. [Means for solving the problem]

[0007] In order to solve the above problems, the gangway structure attached to a lifting device of the present invention comprises a pivot shaft connected to an end of the lifting device, a gangway having a base connected to the pivot shaft and rotatable around the pivot shaft, a torsion spring provided on the pivot shaft, and a contact member provided at the upper end of a support pillar provided to extend vertically upward from the bottom of a lifting shaft in which the lifting device is provided, and is characterized in that when the lifting device is lowered, the contact member contacts and presses the underside of the gangway plate, causing the gangway plate to rotate so that its tip moves vertically upward, and when the lifting device is raised, the contact member moves away from the underside of the gangway plate, causing the gangway plate to rotate while being braked by the torsion spring so that its tip moves vertically downward. Effect of the Invention

[0008] The gangway structure attached to a lifting device of the present invention comprises a torsion spring provided on the pivot shaft of the lifting device, a support pillar provided so as to extend vertically upward from the bottom of the elevator shaft in which the lifting device is provided, and a contact member provided on the upper end of the support pillar, and when the lifting device is lowered, the contact member contacts and presses against the underside of the gangway plate, causing the gangway plate to rotate so that its tip moves vertically upward, and when the lifting device is raised, the contact member moves away from the underside of the gangway plate, and the gangway plate rotates while being braked by the torsion spring so that its tip moves vertically downward, therefore the gangway plate can be automatically rotated and lifted with a simple configuration and the impact when the gangway plate is placed on a luggage transfer surface such as a truck can be reduced. [Brief description of the drawings]

[0009] [Figure 1] 1 is a front view of a lifting device structure equipped with a bridge plate according to an embodiment of the present invention; [Diagram 2] 2 is a cross-sectional view along the line AA illustrating a first state of the lifting device structure to which the bridge plate illustrated in FIG. 1 is attached. [Diagram 3] 2 is a cross-sectional view along the line AA illustrating a second state of the lifting device structure to which the bridge plate illustrated in FIG. 1 is attached. FIG. [Figure 4] 2 is a cross-sectional view along the line A-A showing a third state of the lifting device structure to which the bridge plate shown in FIG. 1 is attached. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings, FIGS. 1 to 4. 1 is a front view of a lifting device structure with a gangway according to an embodiment of the present invention. The lifting device structure 1 is provided inside a pit 40 formed on a platform of a warehouse to which a truck yard is attached. The pit 40 constitutes a hoistway for the lifting device structure 1.

[0011] The lifting device structure 1 is provided with a table portion 10, which is a loading platform that can be raised and lowered in the vertical direction. A flat table top portion 11 is formed on the upper surface of the table portion 10. Two support members 15 are provided on the side ends of the table portion 10. The support members 15 are provided on the side of the table portion 10 that faces the loading platform of a truck or the like (not shown). A base portion 14 of the lifting device structure 1, to which a gangway is attached, is provided on the bottom of the pit 40.

[0012] A pivot shaft 25 of the crossing plate 20 is connected to each support member 15 of the table section 10. The pivot shaft 25 is fixed to the bottom surface 22 side of the crossing plate of the base 26 of the crossing plate 20. The crossing plate 20 is entirely made of a metal having sufficient strength, such as stainless steel. Each end of the pivot shaft 25 is inserted into each support member 15, and the pivot shaft 25 is supported rotatably with respect to each support member 15. As a result, the crossing plate 20 is provided rotatably with respect to the table section 10 via the pivot shaft 25. Two torsion springs 24 are wound around the pivot shaft 25 with a gap between them. One end of each torsion spring 24 is connected to each support member 15, and the other end of each torsion spring 24 is connected to the bottom surface 22 side of the crossing plate. Reinforcing plates 23 are provided on both sides of the bottom surface 22 of the crossing plate. Instead of the torsion springs 24, other types of elastic members such as leaf springs may be used.

[0013] A support pillar 30 is provided at the bottom of the pit 40, extending vertically upward. The support pillar 30 is formed so that the position of the upper end is substantially equal to the upper end of the pit 40. The support pillar 30 also has a flip-up roller 31 rotatably attached to the upper end. The flip-up roller 31 constitutes a contact member.

[0014] Fig. 2 is an AA cross-sectional view showing a first state of the lifting device structure 1 shown in Fig. 1. The table portion 10 is connected to the base portion 14 by an expandable member 16. The expandable member 16 is a diamond-shaped or pantograph-shaped link mechanism, and is configured to be expandable and contractible in the vertical direction, i.e., in the directions of arrows B and C, by a power source (not shown) provided inside the base portion 14. Note that, although the expandable member 16 is a link mechanism in this embodiment, other mechanisms such as a plunger may also be used.

[0015] Next, the operation of the lifting device structure 1 to which the crossing plate 20 according to this embodiment is attached will be described. First, a state in which the tip of the crossing plate 20 faces vertically upward will be described. In a first state of the lifting device structure 1 to which the crossing plate according to this embodiment is attached, shown in Fig. 2, the expandable member 16 is in a state of being fully contracted, and the table portion 10 is lowered to its lowest position. At this time, the jump-up roller 31 at the upper end of the support 30 is in contact with the lower surface 22 of the crossing plate, so that the crossing plate 20 is rotated in the direction of the arrow D, and the tip 27 faces vertically upward, resulting in a stored state.

[0016] Next, the operation of moving the tip of the crossing plate 20 vertically downward will be described. FIG. 3 is an AA cross-sectional view showing a second state of the lifting device structure 1 to which the crossing plate shown in FIG. 1 is attached. In the second state of the lifting device structure 1 of this embodiment, after loading luggage (not shown) on the table top 11 and stopping a truck having a truck bed 50 at the stop position of the platform, the worker operates the power of the expandable member 16 to extend the expandable member 16. As a result, the table part 10 rises in the direction of the arrow B, and the lower surface 22 of the crossing plate and the jump-up roller 31 at the upper end of the support 30 are separated. Next, the worker pushes the crossing plate 20 in the direction of the arrow E, and the crossing plate 20 not supported by the support 30 rotates in the direction of the arrow E by its own weight and is placed on the luggage transfer surface of the truck or the like. That is, the tip of the crossing plate 20 moves vertically downward.

[0017] Fig. 4 is a cross-sectional view taken along line AA showing a third state of the lifting device structure shown in Fig. 1. In the third state of the lifting device structure 1 to which the crossing plate of this embodiment is attached, the crossing plate 20 is rotated until it comes into contact with the truck bed 50, and the table top 11 and the luggage transfer surface of the truck bed 50 are connected by the crossing plate 20. This makes it possible to smoothly transfer luggage (not shown) loaded on the table top 11 to the luggage transfer surface of the truck bed 50. It is also possible to smoothly transfer luggage loaded on the luggage transfer surface of the truck bed 50 to the table top 11.

[0018] When the gangway plate 20 is rotated toward a load transfer surface of a truck or the like, the torsion spring 24 biases the gangway plate 20 in the direction opposite to the direction of arrow E (i.e., the direction of arrow D), and the force with which the gangway plate 20 rotates in the direction of arrow E due to its own weight is slightly greater than the force with which the torsion spring 24 biases the gangway plate 20 in the direction opposite to the direction of arrow E (the direction of arrow D). As a result, the rotation of the gangway plate 20 is braked by the torsion spring 24, and the gangway plate 20 rotates in the direction of arrow E at a low speed, reducing the impact when the gangway plate 20 comes into contact with the truck bed 50. In addition, the burden on the worker when manually adjusting the height of the tip of the gangway plate 20 is reduced.

[0019] Next, the operation of storing the gangway plate 20 will be described. When the worker retracts the expandable member 16 after the cargo transfer operation is completed, the table portion 10 descends in the direction of arrow C. Then, the flip-up rollers 31 of the supports 30 come into contact with the lower surface 22 of the gangway plate. Next, when the table portion 10 further descends in the direction of arrow C, the flip-up rollers 31 push the lower surface 22 of the gangway plate vertically upward while rotating, as shown in FIG. 2. This automatically moves the tip of the gangway plate 20 vertically upward, and the gangway plate 20 is rotated in the direction of arrow D to enter the stored state. In addition, since the flip-up rollers 31 push up the lower surface 22 of the gangway plate, the gangway plate 20 can be rotated smoothly.

[0020] As described above, the crossing plate structure with the lifting device according to this embodiment includes the pivot shaft 25 connected to the end of the table portion 10, the crossing plate 20 having the base portion 26 connected to the pivot shaft 25 and rotatable about the pivot shaft 25, the torsion spring 24 provided on the pivot shaft 25, and the spring roller 31 provided on the upper end of the support 30 provided to extend vertically upward from the bottom of the pit 40 in which the table portion 10 is provided. When the table portion 10 is lowered, the spring roller 31 contacts the lower surface 22 of the crossing plate. When the table portion 10 is raised, the flip-up roller 31 moves away from the underside 22 of the gangway plate and the gangway plate 20 rotates so that the tip portion 27 of the gangway plate 20 moves vertically downward. Therefore, the gangway plate can be rotated and lifted automatically with a simple configuration without using power such as hydraulic, pneumatic, or electrical power, and the impact when the gangway plate 20 comes into contact with the truck bed 50 can be reduced with a simple configuration. [Explanation of symbols]

[0021] 10 table portion, 20 gangway, 22 underside of gangway, 24 torsion spring, 25 pivot shaft, 26 base, 27 tip portion, 30 support, 31 jump-up roller (contact member), 40 pit (hoistway).

Claims

[Claim 1] A rotation shaft connected to an end of the lifting device; A bridge plate having a base connected to the pivot shaft and rotatable around the pivot shaft; a torsion spring provided on the rotating shaft; A contact member provided at the upper end of a support column that is provided so as to extend vertically upward from the bottom of the elevator shaft in which the elevator device is provided; Equipped with When the lifting device is lowered, the contact member contacts and presses the underside of the gangway plate, and the gangway plate rotates so that the tip of the gangway plate moves vertically upward, A gangway structure attached to a lifting device in which, when the lifting device is raised, the contact member moves away from the underside of the gangway and the gangway rotates while being braked by the torsion spring so that the tip of the gangway moves vertically downward.

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