Conveyor

Abstract

While protecting the person using the conveying device, it also makes it difficult to handle the manual push members. to eliminate the obstacle. [Solution] A conveying device comprising a push member that extends in the vertical direction, with the lower end of the push member inserted into a hole provided in at least one corner of a base plate equipped with casters and removably fixed in place; the push member has a curved portion, and the hole has an anti-rotation structure that allows the curved portion to be fixed in multiple directions, so that the push member can be gripped and the load can be conveyed regardless of the direction it is fixed in.

Description

[Technical Field]

[0001] The present invention relates to a transport device. [Background technology]

[0002] A conveying device for manually transporting goods such as merchandise, equipment, materials, and parts has a basic structure consisting of a base plate on which the goods are placed, casters installed underneath, and holes in the four corners of the base plate, with one end of a straight pipe push member inserted and fixed into the holes. As shown in Figure 1, when this conveying device is moved by gripping and pushing the push member, hands may be injured by rubbing against the walls, pillars, or equipment of a building, or by coming into contact with other conveying devices. To prevent such injuries, it is known to provide a protective device that is obtained by separately molding or the like and that can be attached to the hand pushing member, as shown in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-39491 Summary of the Invention [Problem to be solved by the invention]

[0004] The protective member provided on the known push member of the conveying device is molded separately from the original straight pipe push member, and is mainly cylindrical in shape. The appearance of the push member is not just a straight pipe, but by attaching the protective member, part of the outer diameter is expanded. Furthermore, when storing or transporting the conveying device, it is common to remove the push members from the conveying device. In the above-mentioned prior art, when the push members with protective members removed from the conveying device are stacked for storage or transportation, the protective members on each push member function as spacers between adjacent straight pipes on the top, bottom, left, and right, creating significant gaps between the push members. As a result, a much larger space is required than when storing or transporting simple straight pipes without protective members. As a result, the number of trucks and other equipment required to transport the same number of conveying devices and the storage space required are significantly increased.

[0005] For this reason, it may be possible to remove the protective member from the hand-push member for the straight pipe and store or transport each separately, but this method is not actually realistic when considering the effort required to remove and attach the protective member at the site of use, and the effort required to manage, store, and transport the straight pipe and protective member separately. The present invention aims to protect the person using the transport device and at the same time eliminate the danger posed by the push member. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention has the following configuration. 1. A conveying device comprising a push member extending in the vertical direction, the lower end of which is inserted into a hole provided in at least one corner of a base plate provided with casters and removably fixed thereto; The push member has a curved portion, The hole has a rotation prevention structure that allows the curved portion to be fixed in a plurality of directions, and the conveying device can grip the push member and convey the load no matter which direction it is fixed in. 2. The conveying device according to 1, wherein the curved portion of the push member is provided at the upper end of the push member and / or in the middle of the push member. 3. A conveying device as described in 1 or 2, in which a ring-shaped body is provided below the curved portion of the push member so that the ring of the ring-shaped body passes through it, and the ring-shaped body is provided so as to be rotatable relative to the push member. 4. The conveying device according to any one of 1 to 3, wherein the push member has a load protection portion. 5. The conveying device according to any one of 1 to 4, wherein the push member has a user protection part. 6. The conveying device according to any one of 1 to 5, wherein the push member has a branch portion at its lower portion. [Effects of the Invention]

[0007] The present invention provides the following effects. (1) When using the conveying device, hand injuries can be prevented by the curved portion of the push member itself. Therefore, it is not necessary to attach a separately molded protective device to a push member that does not have a curved portion. Here, hand injuries refer to injuries caused by contact with flat walls when moving the conveying device, especially when changing direction, at construction sites, civil engineering sites, etc. In addition, the present invention also targets the prevention of injuries caused by objects that do not have flat surfaces and that protrude toward the user at unpredictable heights, such as various components, equipment, and devices installed or stored at these sites. (2) The push member does not have a separate protective device attached, so the push member does not become bulky due to the protective device. Therefore, after removing the push member from the conveying device, the space required for storing and transporting the push member can be reduced without removing the protective device, and as a result, more push members can be loaded onto one truck, etc. (3) When the conveying device is not in use, the push member may be removed from the base plate and stored. In this case, if the push member is simply a straight pipe, it will rotate downward if the storage location is an inclined surface. In contrast, according to the present invention, even if the push member is placed on an inclined surface, it will not rotate downward. Therefore, it is easy to select a storage location. [Brief explanation of the drawings]

[0008] [Figure 1] 1A and 1B are diagrams showing a conventional conveying device and an example of its use. [Figure 2] 10A and 10B are diagrams illustrating the angle of a push member of the transport device according to the present invention. [Figure 3] FIG. [Figure 4] FIG. 4 is a diagram showing a structure for attaching a push member. [Figure 5] FIG. 4 is a diagram showing a structure for attaching a push member. [Figure 6] 10A and 10B are diagrams showing examples of a push member. [Figure 7] 10A and 10B are diagrams showing examples of a push member. [Figure 8] 10A and 10B are diagrams showing examples of a push member. [Figure 9] 10A and 10B are diagrams showing examples of a push member. [Figure 10] 10A and 10B are diagrams showing examples of a push member. [Figure 11] 10A and 10B are diagrams showing examples of a push member. [Figure 12] FIG. [Figure 13a] FIG. 10 is a diagram showing a conveying device provided with a circular ring body. [Figure 13b] FIG. 10 is a diagram showing a conveying device provided with a circular ring body. [Figure 14] FIG. 10 is a diagram showing a structure provided with a circular ring body. [Figure 15] FIG. 10 is a diagram showing a push member having a branch portion attached to a cart. [Figure 16] FIG. 10 is a diagram showing a push member having a branch portion attached to a cart. [Figure 17] FIG. 10 is a diagram showing a push member having a branch portion attached to a cart. [Figure 18] FIG. 4 is a diagram showing a structure for attaching a push member. [Figure 19] FIG. 4 is a diagram showing a structure for attaching a push member. [Figure 20] FIG. 10 is a diagram showing a state in which the conveying device is being pushed. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described below. A conveying device is configured by inserting and fixing a lower end of a push member into a hole provided in at least one corner of a base plate provided with casters, The push member is a conveying device with a curved portion. First, Fig. 1 shows the basic configuration of a conventional conveying device, that is, a configuration in which straight pipes are simply connected to the four corners of a base plate and pushed by hand. However, only the positional relationship between the conveying device and a person in the conveying device of the present invention will be explained based on Fig. 1. Regarding directions related to the conveying device of the present invention, when a user stands on the short side of the approximately rectangular base plate on which items are placed in the conveying device, the direction of the short side is defined as the left-right direction, the direction of the long side of the base plate is defined as the front-to-back direction (the user side is rearward), and the direction in which the four push members extend perpendicular to the surface of the base plate is defined as the up-down direction.

[0010] In Figure 1, Figure 2 shows the orientation of the left rear push member A when viewed from above and below when a user holds the right rear push member with their right hand and the left rear push member with their left hand. In Figure 2, the angle parallel to the left-right direction and to the left is defined as 0°, and angles clockwise are 90°, 180°, and 270°. This angle definition is adopted in the conveying device of the present invention. This angle is used to explain the curved direction of the curved portion of the push member of the present invention. When the rear right hand push member B is held with the right hand, the angle of the rear right hand push member B is set to be symmetrical with respect to a line that passes through the center of the base plate in the left-right direction and is parallel to the front-to-rear direction with respect to the direction of the angle shown on the left hand side. In this case, the angles of the rear right hand push member B are 0° to the right, 90° forward, 180° to the left, and 270° backward.

[0011] The angle of the push member C at the front left side of the platform is set to be symmetrical with respect to a line that passes through the center of the platform in the front-to-rear direction and is parallel to the left-to-right direction, relative to the angle at the rear left side as shown in the figure. In this case, the left direction of the push member C at the front left side is 0°, the front direction is 270°, the left direction is 180°, and the rear direction is 90°. The angle of the push member D at the front right side of the base plate is set to be point symmetrical with respect to the center of the base plate relative to the angle shown in the figure of the push member A at the rear left side. In this case, the angles of the push member D at the front right side are 0° to the left of the push member D, 270° forward, 180° left, and 90° backward.

[0012] [Base plate with casters] In the conveying device of the present invention, the platform 1 on which items are loaded is equipped with a push member 2, which is a tube or rod that the user can hold in their hand, and is used to place items to be transported, such as components used at construction sites, factories, etc., on its upper surface, and is generally rectangular in shape when viewed from above. The base plate 1 and the push member 2 are formed with the same components and structure as known conveying devices, and are made exclusively of metal. As shown in Figure 3, the underside of the base plate 1 is provided with four or six casters 4 of a known structure. When six casters are provided, it is preferable to provide a fifth and sixth caster at two locations, one at the bottom of each corner of the base plate, and one at the middle of each of the two long sides. These fifth and sixth casters may be rotatable or fixed. When multiple base plates 1 are stacked for transport or storage, the base plates 1 can be configured so that each caster 4 on the upper base plate is stored in a recess 5 provided at a corresponding position on the top surface of the lower base plate 1. When stored in this manner, the base plates 1 can be stacked one on top of the other relatively stably.

[0013] [The lower end of the push member is inserted into a hole provided in at least one corner of the base plate and fixed in place.] The base plate has four corners with insertion holes 3 for inserting the lower ends of the push members 2. The lower ends of the push members 2 may be inserted into at least one of the insertion holes 3 at the four corners, or into all of them, or, for example, only the two insertion holes 3 on the user's side. As shown in Fig. 4(a) showing one corner of the base plate 1 from the bottom and Fig. 4(b) showing the side, when the lower ends of the push members 2 are inserted into the insertion holes 3 for use, it is preferable to provide a rotation prevention structure 6 to prevent the push member 2 held in the hand from rotating around its vertical axis. By providing the rotation prevention structure 6, it is possible to prevent the push member 2 from rotating and the grip portion from rotating in position during use, allowing for a more secure grip.

[0014] In addition, the embodiments included in "fixing" include an embodiment in which the push member 2 and the insertion hole 3 are completely fixed by directly tightening a bolt or the like, and an embodiment in which the push member and the base plate can be separated by simply pulling the push member 2 upward. As an example of a fixing method, to prevent rotation of the push member 2, a rod such as a bolt is fixed by passing it diametrically through the insertion hole 3 to form the rotation prevention structure 6. In this case, as shown in Figures 5(a) and 5(b), one or more recesses 7 are formed in advance at the lower end of the push member 2. The lower end of the push member 2 is inserted into the insertion hole 3, and the rotation prevention structure 6 is fitted into this recess. In this case, the orientation of the curved portion 10 can be adjusted by selecting which of the multiple recesses 7 to fit into the rotation prevention structure 6. For example, in Figure 5(b), the orientation of the curved portion can be selected from four different options. By being able to adjust the orientation of the curved portion 10, the present invention exhibits the effect of being able to adapt to the usage environment of the conveying device and the characteristics of the load (weight, size, shape, etc.).

[0015] As another example of a fixing method for preventing rotation of the push member 2, in addition to the anti-rotation structure 6 (not shown), the cross-sectional shape of the plane perpendicular to the lengthwise direction of the insertion hole 3 may be a shape other than a circle, such as a polygonal or elliptical shape. The cross-sectional shape of the plane perpendicular to the lengthwise direction of the lower end of the push member 2 may be determined to correspond to this shape without having excessive play. For example, the push member 2 can be fixed by a structure in which the outer cross-section of at least the lower end of the push member 2 has a similar hexagonal shape inserted into the insertion hole 3 whose inner cross-section is hexagonal, and rotation of the push member 2 relative to the insertion hole 3 can be prevented.

[0016] In these cases, the position of the lower end of the push member 2 is restricted to prevent the push member 2 from dropping too low, so that the push member 2 does not slip through the insertion hole 3 and come into contact with the floor or ground. In this case, the push member 2 is supported by a rotation prevention structure 6 or the like shown in Figures 4(a) and 4(b). That is, a rod such as a bolt that passes through the insertion hole 3 in the diameter direction may be inserted through the insertion hole 3 so as to cross the inside of the insertion hole 3, and the lower end of the push member 2 may abut against the rod. Alternatively, a bottom surface may be formed at the bottom of the insertion hole 3 to close the insertion hole 3 in order to prevent the inserted push member 2 from being positioned further downward, so that the insertion hole 3 is not a through hole.

[0017] [Appearance of the conveying device of the present invention] Fig. 3 shows an example of the transport device of the present invention, in which the lower end of the push member 2 is inserted into the insertion holes 3 at the four corners of the base plate. The lower part of the push member 2 is a part where the push member 2 extends linearly upward from the lower end. Above that, there is a curved part 10.

[0018] [Hand-pushed parts] The push member 2 in the present invention may be a rod-shaped object or a lighter hollow pipe member. The cross section of the push member taken along a plane perpendicular to the longitudinal direction may be circular, polygonal such as square or hexagonal, or irregular.

[0019] [Bend] The curved portion 10 in the present invention is a curved portion provided above a portion of the hand push member 2 provided at at least one of the four corners of the base plate 1 that extends vertically straight from the bottom end of the hand push member 2, or a portion extending straight in a non-vertical direction above the curved portion. Therefore, the hand push member 2 is not linear over its entire length as shown in Figure 1 above. The shape of the hand push member 2 including the curved portion 10 is such that part of its entire length is shaped like a straight pipe that has been bent. The curved portion 10 is not a straight pipe to which a separate disc-shaped or cylindrical member is attached to protect hands. At least two push members 2 attached to the base plate 1 that are held by the user have curved portions 10 midway from the lower end connected to the base plate 1 to the upper end. The curved portions 10 may be shaped as if the push members 2 are bent at an arbitrary angle, or may be entirely curved, such as an arc. They may also include a curved portion followed by a straight portion extending diagonally.

[0020] Examples of the push member 2 used in the present invention are shown in Figures 6 to 11 and 18. These figures are side views of the push member 2. However, shapes other than those shown as examples may be used as long as the effects of the present invention can be achieved. 6 has the same shape as the push member 2 shown in Fig. 3, and the curved portion 10 is formed by bending or welding at an angle midway through the push member 2. A cylindrical load protection portion is attached to the bottom of the push member 2 to protect the load. The curved section 10 in Figure 7 has the same appearance as the curved section 10 shown in Figure 6, but has a structure in which the joints forming three straight pipes and two diagonal sections C are integrated using bolts B, rivets, etc. The curved section 10 in Figure 8 has a different appearance from the curved section 10 shown in Figure 6, and has a structure in which three straight pipes and two connecting plates D with an approximately U-shaped cross section are integrated together using bolts B, rivets, etc. The curved section 10 in Figure 9 has the same appearance as the curved section 10 shown in Figure 8, but has a structure in which three straight pipes are inserted into a connecting pipe E, which has a structure in which two pipes are adjacent to each other, and are integrated with bolts B, rivets, etc. The curved portion 10 in Fig. 10 has a structure formed by bending the originally straight push member 2 midway. Fig. 10(b) is a view of the push member 2 as seen from above. The curved portion 10 in Fig. 11 has a double structure of the curved portion 10 shown in Fig. 3. In Fig. 11(b), which shows the push member 2 as viewed from above, the push member 2 is first bent downward in Fig. 11(b) to form curved portion 10-1, then bent 90° to the right from below to form curved portion 10-2, then bent downward in the length direction of the push member 2 to form curved portion 10-3, and further bent in the same manner to form curved portions 10-4 and 10-5. Furthermore, structures that are integrated with bolts B, rivets, etc. are not disassembled during use, and are therefore not what is called detachable structures. For example, the structure of a building or other structure in which the steel frame is fixed with bolts is not normally called detachable.

[0021] As shown in Figure 3, in the push member 2, the straight portion on the upward extension of the straight portion fixed by the insertion hole 3 provided in the base plate 1 is called the straight portion 2a. The straight portion 2a is usually located below the curved portion 10, but may also be located above the curved portion 10. The position of the curved portion 10 on the push member 2 is arbitrary, and it may be midway up or down the push member 2 or at the top end of the push member 2. When the curved portion 10 is located at the top end of the push member 2, for example, as shown in Figure 8, it has a structure in which two straight pipes and one connecting plate D with a roughly U-shaped cross section are integrated with bolts B, rivets, etc. It is not necessary to provide the curved portion 10 at a height that is clearly difficult for the user to grip. The lower end of the curved portion 10 is the point connected to the straight portion at the bottom. When the curved portion 10 is provided midway in the vertical direction of the push member 2, the upper end of the curved portion 10 is the lower end of the straight portion at the top that is further above it.

[0022] The user grips the curved portion 10 provided on the push member 2 with their hand to move the transport device. Furthermore, if the outer diameter and shape of the portion other than the curved portion 10 are the same as or similar to the curved portion 10, the user can also grip the straight portion 2a above or below the curved portion 10 to move the transport device. For example, when the load is heavy or when climbing an inclined surface, or when the user needs to push with force, there is a possibility that the user will grip the straight portion 2a above or below the curved portion 10. In this case, the orientation of the push member 2 inserted into the insertion hole 3 of the base plate 1 may be adjusted to reliably protect the user's hand. Since the curved portion 10 is a portion that protects the user's hand, when the user grips the curved portion 10 while the push member 2 is attached to the base plate 1, the curved portion 10 must be positioned laterally inward of the straight portion 2a below it. When the straight portion 2a is located above the curved portion 10, the curved portion 10 may be positioned further inward than the straight portion 2a. Furthermore, if the user is to grip not the curved portion 10 but the straight portion 2a above or below it, the push member 2 may be inserted into the insertion hole 3 and re-fixed so that the outer side of the curved portion 10 is positioned outward in the left-right direction from the straight portion 2a. For example, although each curved portion 10 is at a 180° position in FIG. 3, the push member 2 can be inserted into the insertion hole 3 so that it is at a position of 0°, 45°, 315°, etc.

[0023] [Gripping part] As described above, the user may grip the curved portion 10 of the push member 2, or may grip the straight portion 2a above the curved portion 10 that extends perpendicular to the upper surface of the base plate 1, or the straight portion below the curved portion 10 that extends perpendicular to the upper surface of the base plate 1; these gripping locations are particularly referred to as the grip portion 11. As described above and shown in Fig. 5, the present invention allows the orientation of the curved portion 10 of the push member 2 to be changed as desired. This can be achieved by making the push member 2 fixable in multiple orientations. When a user grasps the curved portion 10 provided on the push member 2 shown in Fig. 3 with their hand, the curved portion 10 becomes the grip portion 11. In this case, the angle of the curved portion 10 shown in Fig. 2 is, for example, between 90° and 270° with respect to the insertion hole 3 to which the push member 2 is fixed, toward the center of the base plate from left to right. In this case, the curved portion 10 is positioned further inward in the left-right direction than the straight portion of the push member 2, so that direct contact with not only pillars and walls but also objects such as components, equipment, and devices that do not necessarily have flat surfaces and that protrude toward the user at unpredictable heights can be prevented, preventing injury. The straight portion of the push member must be located on the outer side of the grip portion 11 in the left-right direction of the cart.

[0024] 18 shows a push member 2 whose lower end is inserted into and fixed to an insertion hole 3 provided in a base plate 1. The push member 2 extends directly upward from the insertion hole 3, with a curved portion 10 formed midway. The curved portion 10 may have a structure formed by bending the lower portion of the push member 2, and the curved portion 10 may have a straight portion extending diagonally upward from the bent portion, or may have only a curved shape. A straight portion 2a extending perpendicular to the surface of the base plate 1 may be provided above the curved portion 10. When using such a push member 2, the user may push the conveying device using the straight portion 2a as the grip portion 11, as shown in FIG. 18, when the curved portion 10 and the straight portion 2a provided thereon are used as the grip portion 11, the position is preferably between the 90° and 180° positions or the 180° and 270° positions in FIG. 3, and is directed toward the center of the base plate 1 in the left-right direction rather than the insertion hole 3. In this case, the hand gripping the straight portion 2a or the curved portion 10 can be protected. Figure 19 is a top view of the transport device shown in Figure 18. The curved portion 10 of the push member 2 faces outward from the cart and toward the center in the left-right direction, so that the straight portion 2a above it is also positioned in a position facing outward from the cart and toward the center in the left-right direction. Figure 20 is a side view of the transport device shown in Figure 18 when in use. As a result, the part of the hand that the user grips with their hand does not extend beyond the left-right direction of the platform 1, so there is no risk of contact with walls, equipment, etc., and injury. The position of the bending portion 10 may be the 270° position in FIG. 3, or may be between the 180° position and the 270° position. 18, the straight portion 2a does not have to be provided on the curved portion 10. In that case, the curved portion 10 also serves as the grip portion 11. In the latter case in particular, in order to protect the hands, the curved portion 10 needs to be positioned at an angle of 0° from the 90° position or 270° from the 0° position in FIG. 3 so that the curved portion 10 faces outward in the left-right direction of the base plate 1 relative to the grip portion 11. Note that even if the straight portion 2a is provided, the curved portion 10 may be gripped.

[0025] Furthermore, for example, when the angle is between 90° and 270°, particularly 180°, the curved portion 10 (the grip portion 11) is located at the farthest position from an object that may be projecting toward the user. When the angle is around 225°, the curved portion 10 (the grip portion 11) is located inside and behind the straight portion of the push member in the left-right direction, preventing contact from a wider variety of directions. Furthermore, when the angle is around 135°, there is no load or only a small amount of load, and contact from the left and right directions of the cart can be prevented. The orientations of the push members 2 fixed to the base plate may be set at the same angle as described above. Alternatively, they may be set at any angle independently of each other. As a result, the manner in which the user's hands are protected can be changed between the left and right hands depending on the surrounding environment when the transport device is moving. In particular, the notches at the bottom end of the push member 2 can be fitted into the bolts provided below the holes at the four corners of the base plate to prevent rotation of the push member 2. The curved portion 10 is positioned at 225°, which is particularly effective in preventing hands from getting caught in the wall or equipment.

[0026] As described above, when a user grips the push member 2, in some cases the gripping portion 11 is located somewhere other than the curved portion 10. For example, the user may grip the bottom of the curved portion 10 in FIG. 12 as the gripping portion 11. In this case, as shown in FIG. 12, the orientation of the curved portion 10 relative to the insertion hole 3 to which the push member 2 is fixed is within a range of, for example, 270 degrees to 90 degrees clockwise in FIG. 2, and is directed toward the outside on the left and right of the cart. In this case, the curved portion 10 is positioned outside the straight portion of the push member in the left-right direction, so the user's hands are positioned inside the object with the curved portion 10 between them. In other words, the grip portion 11 is not positioned on the outside in the left-right direction of the push member 2, but is a place where the hand is positioned inside the outer surface of the straight part or curved part of the push member 2 when the user grips it.

[0027] [Load protection section] As shown in Fig. 13a, one or more load protection parts 30 of the present invention may be provided for one push member. In Fig. 13a, a cylindrical load protection part 30 is provided at the lower end of the push member 2 near the base plate 1, but the installation location and shape of the load protection part 30 on the push member 2 are not particularly limited.

[0028] The load protection part 30 on the push member may be located above or below the height where the user grips the load, or may be located away from the height where the user grips the load. A more distant location can protect the load from objects that are substantially flat relative to the conveying device, such as walls or pillars, and can also protect the load from relatively low materials or equipment that are located away from the height where the user grips the load. Depending on the location, the protection part may function not only to protect the load but also to prevent injury to the user's hands. The load protection unit 30 may be provided at a location where the push member 2 attached to the base plate 1 comes into contact with the base plate 1, at one or more locations from the lower, middle and upper parts of the push member 2, or, if necessary, at the curved part 10, or one each above and below the curved part 10. Since the load protection unit 30 protects the load on the trolley, the upper limit of the location where the load protection unit 30 is provided is the height of the load permitted for operation. The load protection part 30 shown in Fig. 13a may have a cylindrical cross section, or may have a polygonal or irregular cross section. The cross section may have either a constant or irregular cross section in the vertical direction.

[0029] The load protection part 30 may have a structure strong enough to protect the load and capable of being attached to the push member 2, and may have a through-hole 21 that passes through the push member 2 and be fixed to the push member 2 with some kind of fastener. The shape may be annular or non-annular, and may be polygonal or irregular. The structure for attaching the load protection part to the push member can employ well-known fixing or attachment means, such as covering the push member, welding, or fixing or attaching with bolts, etc. This load protection section 30 may be provided on the push member 2 having the curved section 10 of the present invention, or on a push member having no curved section as shown in FIG.

[0030] The load protection part 30 may be made of resin or metal, but is preferably made of resin. The outer diameter of the load protection part 30 may be about 100 mm to 250 mm, or may be other than that. The load protection part 30 has a through-hole 21, and is provided at any position on the push member 2 so that the push member 2 passes through the through-hole 21. The load protection part 30 may be fixed at any position on the push member 2 so that it does not rotate around the central axis of the through-hole 21. Well-known fixing means such as gluing, welding, or bolting to the push member can be used to fix the load protection part 30 so that it does not rotate.

[0031] Torus One embodiment of the load protection unit 30 is a ring-shaped body 20 as shown in Fig. 13a. As shown in Fig. 14, the ring-shaped body 20 is configured so that the push member 2 passes through a through-hole 21 of the ring-shaped body 20, and the ring-shaped body 20 is not fixed to the push member 2 but rotates around the central axis of the through-hole 21. At this time, the inner diameter of the through-hole 21 forming the ring-shaped body 20 is made sufficiently larger than the outer diameter of the push member 2, forming a gap 22 between the inner surface of the through-hole 21 and the outer surface of the push member. This gap 22 allows the ring-shaped body 20 to rotate freely when the push member 2 passes through the through-hole 21. When the annular body 20 attached to the push member 2 comes into contact with a wall, pillar, or the like, friction between the wall, pillar, or the like and the end of the annular body causes the annular body 20 to rotate. This rotation prevents the load of the conveying device from coming into contact with the wall. Furthermore, since rotation reduces friction and impact compared to when the annular body 20 does not rotate, it is possible to prevent the surface of the annular body 20 from excessively sliding against the wall surface. As a result, it is possible to prevent dirt on the surface of the annular body 20 or the material of the surface of the annular body 20 itself from transferring to the wall, pillar, or the like due to sliding contact and soiling the surface.

[0032] To provide the annular body 20, a rod-shaped object 23 such as a bolt is passed through the hand push member 2 in the radial direction and fixed to the hand push member 2, and the size of this fixed rod-shaped object 23 is set to such an extent that it does not enter the through hole of the annular body 20. If the inner diameter of the through hole 21 forming the annular body 20 is made sufficiently larger than the outer diameter of the push member, the inner surface of the through hole 21 will contact the push member 2 at an angle relative to the position where the annular body 20 is installed, and the annular body 20 itself will also be inclined at an angle relative to the push member, but the above-mentioned effect can still be fully exerted.

[0033] In any case, the lower surface of the annular body 20 is always supported by the rod-like member 23 and does not move below the rod-like member 23. In this case, depending on the shape of the curved portion 10 and the size of the gap, the annular body 20 can be pulled upward and separated from the push member 2. In this case, maintenance of the annular body 20 can be performed more easily. 14, the rod-like members 23 are provided only below the annular body 20, but rod-like members 23 may also be provided above the annular body 20. In this case, the annular body 20 between the two rod-like members 23 can rotate freely at that location.

[0034] In the present invention, as described above, the outer diameter of the annular body 20 is approximately the same as or slightly larger than the outer diameter of the caster of the conveying device, and may be 250 mm or less. Furthermore, the size of the annular body 20 may be large enough so that it will not be lost even if it is separated from the push member 2 at a construction site or civil engineering work site. For example, the outer diameter of the annular body 20 may be 100 mm or more, or may be approximately 120 mm or 80 mm or more. The material constituting the outer surface of the annular body 20 is preferably formed from a resin composition such as a urethane resin. The entire annular body 20 may be formed from the urethane resin, or the inner surface of the ring forming the through hole 21 may be formed from a metal, a hard resin, or other material. Furthermore, the portions of the annular body 20 other than the inner surface of the ring forming the through hole 21 and the outer surface may be formed from a material selected from metal, a hard resin for strength, a soft resin for cushioning, and the same resin as the resin constituting the outer surface.

[0035] In the conveying device of the present invention, the annular body 20 may be provided on the push member 2 not only to protect the load but also to prevent the user's hands from coming into contact with walls, pillars, or materials and equipment at construction sites or building sites. In the present invention, even if the push member 2 has a circular ring body 20, the push member 2 has a curved portion 10, so even if the push member 2 alone is left on an inclined floor surface, the push member 2 will not rotate and move.

[0036] This annular body 20 may be provided on the push member 2 of the present invention having a curved portion, or may be provided on a push member 2 without a curved portion 10 as shown in Figure 1. In this case, the annular body 20 may be fixed to the push member 2 as described above, or may be provided rotatably on the push member 2. The position at which the annular body 20 is provided on the push member may be an upper part adjacent to the height at which the user grips it, a lower part adjacent to the same height, or a position away from the height at which the user grips it. By providing the annular body 20 at the upper part adjacent to the height where the user grasps the handle, or at the lower part adjacent to the same, not only the load of the carrier, walls and pillars but also the user's hands can be protected.

[0037] As shown in FIG. 17 , when a branch 24 is provided on the push member 2, the side of the push member 2 with the branch 24 always faces the center of the cart, regardless of which insertion hole the push member 2 is inserted into. In this case, for example, the shape of the annular body 20 in FIG. 13 a does not have to be annular. As shown in FIG. 13 b , the shape of the annular body may not be circular but may be a sector with a central angle of 180 degrees, 90 degrees, or any other desired central angle, and the center may be fixed rather than rotatable relative to the push member so that it is positioned directly above the branch 24. In this case, regardless of which insertion hole the push member 2 is inserted into, the sector-shaped member functions as a load protector 30, positioned outside the cart from the push member 2 or, in some cases, facing the inside of the cart. In addition, because it is not an annular body 20, the presence of the branch 24 prevents the push member 20 from rotating or pivoting even when removed from the cart and placed on the floor, etc. Therefore, even during transportation, there is no risk of accidental movement. Even if the load protection section 30 has a triangular or irregular cross section instead of the above-mentioned fan shape, if the load protection section 30 is fixed so that it is in the same direction as the formation location of the branch section 24 relative to the push member 2, it can exert the same effect as when it is fan-shaped.

[0038] [User Protection Department] A user protection part 40 can be provided in combination with the curved part 10, as shown in Figure 13a, particularly on the left push member 2. The shape of the user protection part 40 may be the same as that of the load protection part 30. It may be cylindrical, with a circular cross section, and can be provided on the push member 2 by inserting the push member 2 into its hole. The user protection part 40 may be rotatably attached to the push member 2, or may be fixed. The shape of the user protection part 40 may be cylindrical, like the load protection part 30, or may have any shape, such as a polygonal or irregular cross section. When user protection units 40 are provided, one or more may be provided per push member. The user protection units 40 may be provided in addition to or instead of the load protection units 30 and / or the toric body 20. There are no particular restrictions on the location where the user protection part is installed on the push member 2, but in order to protect the user, that is, to provide stronger protection for the user's hands when gripping the push member 2, it is preferable to install it on the curved part 10 of the push member 2 and / or adjacent to the curved part 10, as shown on the push member 2 on the left, so as to be close to the hands when in use. In Figure 13a, the user protection part 40 is installed on only one push member 2, but it may also be installed on the other three push members 2.

[0039] The user protection part 40 works together with the curved part 10 to protect the user's hands. Depending on the relationship between the direction of movement of the transport device and the position of the contacting member, the curved part 10 can be the grip part 11, or the upper or lower part of the curved part 10 can be the grip part 11. In that case, the user protection part 40 can be provided above or below the grip part as desired. In FIG. 13a, when a user grips the curved portion 10 as a gripping portion with his / her hand, one user protection portion may be provided above and one below the curved portion 1 of the hand pushing member, or one may be provided on either one side. This user protection portion 40 may be provided on the push member 2 of the present invention having a curved portion, or may be provided on the push member without a curved portion as shown in FIG. The above-mentioned various load protection parts and user protection parts other than the curved part may be provided so as to be detachable from the push member 2, or may be provided so as to be integral with a structure such as bolts or rivets so as not to be detachable.

[0040] As described below, when the push member 2 is provided with a branch 24, the side of the push member 2 with the branch 24 always faces the center of the cart, regardless of which insertion hole the push member 2 is inserted into. Even in this case, the user protection part 40 can have the same shape and be provided in the same manner as described above. Depending on the shape, the user protection part 40 may be attached to the push member 2 so that it can be rotatable, or may be fixed. Furthermore, the user protection unit 40 may have a sector-shaped cross section, similar to the load protection unit 30, and the central angle of the sector may be adjusted as desired. The central angle may be set within the range of 90 degrees to 270 degrees, or may be any other angle. The fan-shaped portion may be fixed rather than rotatable relative to the push member so that it is positioned outside the cart from a position directly above the branch portion 24. In this case, regardless of which insertion hole the push member 2 is inserted into, the fan-shaped portion will be positioned outside the cart from the push member 2 and function as the user protection portion 40. In addition, since it is not a ring-shaped body 20, even if the push member 20 is removed from the cart and placed on the floor, the presence of the branch portion 24 prevents the push member from rotating or turning. Therefore, it will not move unintentionally, even during transportation. Even if the load protection section 30 has a triangular or irregular cross section instead of the above-mentioned fan shape, if the user protection section 40 is fixed so that it faces the outside of the trolley at the formation point of the branch section 24 for the push member 2, it can exert the same effect as when it is fan-shaped.

[0041] [Load height display] When using the conveying device of the present invention, the curved portion formed to form the curved portion 10 of the push member of the present invention, for example as shown in Figure 8, may be positioned at any height from the top surface of the cart. The height of the load can be confirmed using each part of the push member of the present invention as a guide.

[0042] [Branch] 15, a branch 24 is provided on the lower side of the push member 2. The branch 24 is bent downward, leaving a gap between it and the surface of the push member 2. There are no particular limitations on the means for providing the branch 24 on the push member 2, and the branch 2 may be fixed to a through-hole formed in the push member 2, or may be welded to the push member 2, or other means may be used. The branch portion may have a rod shape with a circular cross section as shown in FIG. 15, or the cross section may have any other shape such as a square or oval. When the lower part of the push member 2 is inserted into the insertion hole 3 of the dolly, the branch 24 is positioned on the outer surface of the insertion hole 3 and on the side facing approximately the center of the loading surface of the dolly. At the same time, the curved part 10 is provided so that the push member 2 is curved in the same direction as the branch 24 comes out. As shown in Figure 16, a branch portion 24 extending downward from the side of the push member 2 is provided on the outer surface above the point at which the lower part of the push member 2 is inserted into the insertion hole 3 of the trolley so that the lower part of the push member 2 having the curved portion 10 can be inserted into the insertion hole 3 of the trolley and the curved portion 10 can be directed toward the center of the trolley. When the lower part of the push member 2 is inserted into the insertion hole 3 of the dolly, the branch 24 is inserted into the space 25 adjacent to the outer surface of the insertion hole 3 and facing the approximate center of the loading surface of the dolly. As a result, the curved part 10 is provided at the same position in the longitudinal direction of the push member 2 as the position where the branch 24 comes out.

[0043] 17 shows a similar diagram in which push members 2 are provided at the four corners of a cart. The curved portions 10 of the four push members 2 that are inserted into the four insertion holes 3 and provided on the cart can be curved toward approximately the center of the loading surface of the cart. In this case, when viewed from the length direction of the push member 2 (the vertical direction when the lower part of the push member is inserted into the insertion hole 3 of the dolly), it is preferable that the direction in which the curved portion 10 is curved and the direction in which the branch portion 24 is provided are approximately the same. In this way, with one type of push member 2, the curved portion 10 can be directed toward approximately the center of the loading surface of the dolly, regardless of whether it is used on the right or left hand side of the user. Furthermore, the curved portion 10 of the push member 2 provided on the dolly is provided in a direction from the push member 2 toward approximately the center of the dolly, rather than in a position that extends from the edge of the dolly to the left or right side, front, or rear. As a result, it is possible to prevent the hand holding the curved portion 10 from hitting an obstacle, pillar, wall, etc. and getting injured during use. Furthermore, by providing the push member 2 on the cart, the curved portion 10 of the push member 2 can be provided at an appropriate position at the same time.

[0044] As shown in Figure 17, connectors 32 may or may not be provided across the push members 2. Also, in Figure 17, connectors 32 are provided on the outside of the cart between the push members 2, but they may also be provided on the inside. For example, rod-shaped or pipe-shaped members may be fixed so as to extend horizontally at any position on each of the two push members that are pushed by a person with both hands during use, using known means such as clamps 31. A connector 32 of this shape may be provided with a plate displaying information about the cart and the cargo (name of cargo, amount of cargo, destination, schedule, person in charge, etc.), or storage items such as boxes or bags for storing small items or garbage. Additionally, the connector 32 can be squeezed and pushed.

[0045] [Other aspects of the push member] An embodiment will be described in which a straight pipe or a straight rod without a curve is used as the hand push member instead of the hand push member having the curved portion 10 in the present invention. This embodiment is based on the same shape as the push member of the conveying device shown in Fig. 1. However, when the conveying device is moved, especially when changing its direction of travel, there is a possibility that the load on the platform may come into contact with walls, pillars, and various components, equipment, devices, etc. installed or stored at a construction site or civil engineering site, just as with the conveying device of the present invention. In this case, there is a possibility that the walls, pillars, or the load may be damaged, or that the various components, equipment, devices, etc. may be damaged.

[0046] Therefore, in the above-described drawings and configurations of the present invention, the push member does not have a curved portion. Therefore, the push member can be provided with the load protection portion and / or the user protection portion as described above. [Explanation of symbols]

[0047] 1 base plate 2. Hand-pushed member 3 Insertion hole 4 Casters 5 recess 6 Anti-rotation structure 7 recess 10 Curved section 11 Gripping part 20 Torus 21 Through hole 22 Gap 23 Rod-shaped objects 24 Branch 25 Space 30 Load protection section 40 User Protection Department

Claims

1. The conveying device is provided with a push member extending in the vertical direction, the lower end of which is inserted into a hole provided in at least one corner of a base plate provided with casters and removably fixed thereto, The push member has a curved portion, The hole has a rotation prevention structure that allows the curved portion to be fixed in a plurality of directions, and the conveying device can grip the push member and convey the load no matter which direction it is fixed in.

2. 2. The conveying device according to claim 1, wherein the curved portion of the push member is provided at an upper end of the push member and / or at a middle of the push member.

3. 3. The conveying device according to claim 1, wherein an annular body is provided below the curved portion of the push member so that a ring of the annular body passes through the annular body, and the annular body is provided rotatably relative to the push member.

4. 3. The conveying device according to claim 1, wherein the push member has a load protection portion.

5. 3. The transport device according to claim 1, wherein the push member has a user protection portion.

6. 3. The conveying device according to claim 1, wherein the push member has a branch portion at its lower portion.

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