JP7619909B2 - Gangway structure with lifting device - Google Patents

Description

This invention relates to the structure of a gangway attached to a lifting device.

As a conventional lifting device structure, for example, the lifting device structure described in Patent Document 1 is known. The lifting device structure described in Patent Document 1 is installed on a platform of a warehouse equipped with a truck yard, for example, and allows cargo to be loaded onto the flat table section, and by raising and lowering the table section, the cargo can be raised and lowered to the height of the loading platform of a truck or the like.

In such lifting devices, a gangway is required to transfer cargo from the table of the lifting device to the loading platform of a truck or the like, and the use of such a gangway on the table of the 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.

JP 2010-155659 A

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 worker must manually rotate the heavy gangway, which is generally made of stainless steel or the like because it is required to be strong, resulting in a large burden on the worker. Another problem is that the impact is large when the gangway is placed on the cargo transfer surface of a truck or the like.

This invention was made to solve these problems, and aims to provide a gangway structure attached to a lifting device that can automatically rotate and lift the gangway with a simple configuration without using hydraulic, pneumatic, electrical, or other power sources, and that can reduce the impact when the gangway is placed on a cargo transfer surface such as a truck.

In order to solve the above problems, the crossing plate structure for a lifting device according to the present invention comprises a pivot shaft connected to the end of the lifting device, a crossing plate whose base is connected to the pivot shaft and can rotate around the pivot shaft, a torsion spring attached to the pivot shaft, and a contact member attached to the upper end of a support pillar that is installed so as to extend vertically upward from the bottom of the elevator shaft in which the lifting device is installed, and when the lifting device is lowered, the contact member contacts and presses the underside of the crossing plate, causing the crossing plate to rotate so that the tip of the crossing plate moves vertically upward, and when the lifting device is raised, the contact member moves away from the underside of the crossing plate, causing the crossing plate to rotate while being braked by the torsion spring so that the tip of the crossing plate moves vertically downward.

The crossing plate structure for the lifting device according to the present invention includes a torsion spring attached to the pivot shaft of the lifting device, a support pillar extending vertically upward from the bottom of the elevator shaft in which the lifting device is installed, and a contact member attached to the upper end of the support pillar. When the lifting device is lowered, the contact member contacts and presses against the underside of the crossing plate, causing the crossing plate to rotate so that its tip moves vertically upward, and when the lifting device is raised, the contact member separates from the underside of the crossing plate, causing the crossing plate to rotate while being braked by the torsion spring so that its tip moves vertically downward. This simple structure allows the crossing plate to be automatically rotated and lifted, and also reduces the impact when the crossing plate is placed on a cargo transfer surface such as a truck.

1 is a front view of a lifting device structure equipped with a bridge plate according to an embodiment of the present invention; 2 is a cross-sectional view taken along line AA of the lifting device structure to which the bridge plate shown in FIG. 1 is attached in a first state. FIG. 2 is a cross-sectional view taken along line AA of the lifting device structure to which the crossing plate shown in FIG. 1 is attached in a second state. FIG. 2 is a cross-sectional view taken along line AA of the lifting device structure to which the crossing plate shown in FIG. 1 is attached in a third state. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings, FIGS.
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 of the lifting device structure 1.

The lifting device structure 1 is provided with a table portion 10, which is a loading platform that can be raised and lowered vertically. A flat table top portion 11 is formed on the top 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.

The 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 20 at 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 installed on both sides of the bottom surface 22 of the crossing plate. Note that other types of elastic members, such as leaf springs, may be used instead of the torsion springs 24.

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 its upper end is approximately equal to the upper end of the pit 40. The support pillar 30 also has a flip-up roller 31 rotatably attached to its upper end. The flip-up roller 31 constitutes a contact member.

Figure 2 is a cross-sectional view taken along line A-A, showing the first state of the lifting device structure 1 shown in Figure 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 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.

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 the 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 the most contracted state, and the table portion 10 is lowered to the 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, and is in a stored state.

Next, the operation of moving the tip of the crossing plate 20 vertically downward will be described. FIG. 3 is an A-A cross-sectional view showing the 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 the truck with the truck bed 50 stops 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 arrow B, and the bottom surface 22 of the crossing plate and the jump-up roller 31 at the upper end of the support 30 are separated. Next, when the worker pushes the crossing plate 20 in the direction of arrow E, the crossing plate 20 that is not supported by the support 30 rotates in the direction of arrow E due to 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.

Figure 4 is an A-A cross-sectional view showing the third state of the lifting device structure shown in Figure 1. In the third state of the lifting device structure 1 with the crossing plate of this embodiment, the crossing plate 20 rotates 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.

When the gangway plate 20 is rotated toward the cargo 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.

Next, the operation for storing the gangway plate 20 will be described.
When the worker contracts 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 underside 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 underside 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, because the flip-up rollers 31 push up the underside 22 of the gangway plate, the gangway plate 20 can be rotated smoothly.

In this way, the crossing plate structure with the lifting device according to this embodiment includes a pivot shaft 25 connected to the end of the table portion 10, a crossing plate 20 with a base 26 connected to the pivot shaft 25 and rotatable around the pivot shaft 25, a torsion spring 24 provided on the pivot shaft 25, and a spring roller 31 provided on the upper end of a support 30 provided to extend vertically upward from the bottom of a pit 40 in which the table portion 10 is provided. When the table portion 10 is lowered, the spring roller 31 is pressed against the underside 22 of the crossing plate. When the table section 10 is raised, the flip-up roller 31 separates from the underside 22 of the gangway plate, and the gangway plate 20 rotates so that the tip 27 of the gangway plate 20 moves vertically downward. This allows the gangway plate to be automatically rotated and lifted with a simple configuration without using hydraulic, pneumatic, or electrical power, and also reduces the impact when the gangway plate 20 comes into contact with the truck bed 50 with a simple configuration.

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

Claims (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 an upper end of a support column provided so as to extend vertically upward from a bottom of a hoistway in which the lifting device is provided;
When the lifting device is lowered, the contact member contacts and presses the lower surface 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.