Conveying device

Abstract

Protect the cargo from damage. [Solution] A conveying device comprising inserting and fixing the lower end of a push member into a hole provided in at least one corner of a base plate equipped with casters, the push member having one or more load protection parts.

Description

Technical Field

[0005] , ,

[0004] ,

[0001] The present invention relates to a conveying device.

Background Art

[0002] A conveying device for manually conveying articles such as goods, equipment, materials, parts, etc. has a basic structure including a base plate on which the articles are placed, casters provided below the base plate, holes provided at the four corners of the base plate, and one end of a hand-pushing member, which is a straight pipe, inserted into and fixed in the holes. As shown in FIG. 1, when holding and pushing the hand-pushing member of this conveying device to move the conveying device, the wall or column of a building may come into contact with the hand, causing injury to the hand. In order to avoid such injuries, as shown in Patent Document 1, it is known to detachably provide a protector obtained by separate molding or the like on the hand-pushing member.

Prior Art Documents

[0006] To solve the above problems, the present invention has the following configuration. 1. A conveying device in which the lower end of a hand-pushed member is inserted into and fixed into a hole provided in at least one corner of a base plate equipped with casters, The push member is a conveying device having one or more load protection parts. 2. The conveying device according to claim 1, wherein the load protection portion of the push member has a through hole, and the push member is provided through the through hole. 3. The conveying device according to claim 1 or 2, wherein the load protection portion of the push member has a through hole, and the inner diameter of the through hole is larger than the outer diameter of the push member. 4. The conveying device according to any one of 1 to 3, wherein the load protection portion of the push member is rotatable relative to the push member. 5. The conveying device according to any one of 1 to 4, wherein the cargo protection section bulges out to a height of 250 mm or less relative to the surface of the hand-pushing member. 6. The conveying device according to any one of claims 1 to 5, wherein the push member has a branch portion at its lower part. [Effects of the Invention]

[0007] The present invention provides the following effects. A load protection section can be installed at any position on the pusher, allowing for damage to the load to be prevented according to the movement path of the conveying device and the characteristics of any obstacles. Also, when the load protection part is rotatable with respect to the hand-pushing member, even if the load protection part hits a wall or a pillar at the site, the load protection part rotates and does not slide against the wall or the pillar excessively, preventing the wall or the pillar from being soiled or damaged.

Brief Description of the Drawings

[0008] [Figure 1] A diagram showing a conventional transport device and its usage example. [Figure 2] A diagram for explaining the angle of the hand-pushing member of the transport device according to the present invention. [Figure 3] A diagram showing the structure of the base plate. [Figure 4] A diagram showing the structure for attaching the hand-pushing member. [Figure 5] A diagram showing the structure for attaching the hand-pushing member. [Figure 6] A diagram showing an example of the hand-pushing member. [Figure 7] A diagram showing an example of the hand-pushing member. [Figure 8] A diagram showing an example of the hand-pushing member. [Figure 9] A diagram showing an example of the hand-pushing member. [Figure 10] A diagram showing an example of the hand-pushing member. [Figure 11] A diagram showing an example of the hand-pushing member. [Figure 12] A diagram showing the load protection part and the gripping part. [Figure 13a] A diagram showing a transport device provided with an annular body. [Figure 13b] A diagram showing a transport device provided with an annular body. [Figure 14] A diagram showing the structure provided with an annular body. [Figure 15] A diagram showing a hand-pushing member having a branch part provided on a trolley. [Figure 16] A diagram showing a hand-pushing member having a branch part provided on a trolley. [Figure 17] A diagram showing a hand-pushing member having a branch part provided on a trolley.

Modes for Carrying Out the Invention

[0009] The present invention will be described below. First, FIG. 1 shows the basic configuration of a conventional conveying device, that is, a mode in which straight pipes are simply connected to the four corners of a base plate and this is pushed by hand. However, the description is based on FIG. 1 only with respect to the positional relationship between the conveying device and a person in the conveying device of the present invention. Regarding the directions related to the conveying device of the present invention, a user stands on the short side of a substantially rectangular base plate on which articles of the conveying device are placed. As viewed from the user, the short side direction is defined as the left-right direction, the long side direction of the base plate is defined as the front-back direction (the user side is the rear), and the direction in which four hand-pushing members extend perpendicular to the surface of the base plate is defined as the up-down direction.

[0010] In FIG. 1, when the user holds the right rear hand-pushing member with the right hand and the left rear hand-pushing member with the left hand, FIG. 2 shows the direction of the left rear hand-pushing member A when viewed from above to below. FIG. 2 is parallel to the left-right direction and the angle in the left direction is set to 0°, and it is 90°, 180°, 270° clockwise. This definition of the angle is adopted in the conveying device of the present invention. This angle is used to explain the bending direction of the curved portion of the hand-pushing member of the present invention. With respect to the direction of the angle shown on the left hand side, when the right hand holds the hand-pushing member B at the right rear, such an angle at the right rear hand-pushing member is provided to be line-symmetric with respect to a line passing through the middle in the left-right direction of the base plate and parallel to the front-back direction. At this time, for the angle at the right rear hand-pushing member, the right direction of the hand-pushing member B is 0°, the front direction is 90°, the left direction is 180°, and the rear direction is 270°.

[0011] With respect to the direction of the angle shown as such on the left rear, such an angle at the left front hand-pushing member C of the base plate is provided to be line-symmetric with respect to a line passing through the middle in the front-back direction of the base plate and parallel to the left-right direction. At this time, for the left front hand-pushing member C, the left direction is 0°, the front direction is 270°, the left direction is 180°, and the rear direction is 90°. With respect to the angle shown for the left rear push member A, the angle of the right front push member D on the base plate is set to be point-symmetric with respect to the center of the base plate. In this case, the angle of the right front push member D is 0° to the right, 270° to the front, 180° to the left, and 90° to the rear.

[0012] [Base plate with casters] In the conveying device of the present invention, the platform 1 on which articles are loaded is equipped with a push member 2, which is a tube or rod for the user to grasp by hand, and is intended to place articles to be conveyed, such as materials used at construction sites or factories, on its upper surface, and generally has a rectangular shape in plan view. The base plate 1 and the push member 2 are formed from materials and structures similar to those of known conveying devices, and are made exclusively of metal. As shown in Figure 3, four or six casters 4 are provided on the underside of the base plate. When six casters are provided, it is preferable to provide a fifth and sixth caster of a known structure at two locations midway between the lower parts of the two long sides of the base plate, in addition to the four locations at the bottom of each corner. These fifth and sixth casters may be rotatable or fixed in their direction. When multiple base plates 1 are stacked for transport and storage, the structure of the base plates 1 can be such that each caster 4 on the upper base plate is stored in a recess 5 provided at a corresponding position on the upper surface of the lower base plate 1. This storage configuration allows the base plates 1 to be stacked relatively stably.

[0013] [The lower end of the hand-pushing member is inserted into a hole provided in at least one corner of the base plate and secured.] The base plate has insertion holes 3 at each of its four corners for inserting the lower end of the push member 2. The lower end of the push member 2 may be inserted into at least one of the insertion holes 3 at each of the four corners, into all of them, or, for example, into only the two insertion holes 3 on the user's side. As shown in Figure 4(a) when viewing one corner of the base plate 1 from below and Figure 4(b) when viewing it from the side, it is preferable to provide a rotation prevention structure 6 so that the push member 2, when held in the hand, does not rotate around its vertical axis of rotation. By providing the rotation prevention structure 6, it is possible to prevent the push member 2 from rotating or the position of the grip from rotating during use, allowing for a more secure grip.

[0014] Furthermore, the "fixing" aspect includes methods of completely fixing the push member 2 and the insertion hole 3 by directly tightening them with bolts or the like, and methods of separating the base plate and the push member by simply pulling the push member 2 upwards. As an example of a fixing method, to prevent the hand-pushing member 2 from rotating, a rod such as a bolt is fixed through the diametrically within the insertion hole 3 to form a 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 hand-pushing member 2. The lower end of the hand-pushing member 2 is inserted into the insertion hole 3, and the rotation prevention structure 6 is fitted into these recesses. When the hand-pushing member has a curved portion, the orientation of the curved portion 10 can be adjusted by choosing which of the multiple recesses 7 is fitted into the rotation prevention structure 6. For example, in the case of Figure 5(b), the orientation of the curved portion can be selected from four options. By adjusting the orientation of the curved portion 10, the present invention provides the effect of being able to respond according to the usage environment of the conveying device and the characteristics of the loaded material (weight, size, shape, etc.).

[0015] As another example of a method for fixing the push member 2 to prevent rotation, although not shown in the figures, in addition to the rotation prevention structure 6, the cross-sectional shape of the surface perpendicular to the length direction of the insertion hole 3 may be a shape other than a circle, such as a polygon or an ellipse. Then, the cross-sectional shape of the surface perpendicular to the length direction of the lower end of the push member 2 may be determined to correspond to this shape and without having an excessive amount of play. For example, the push member 2 can be fixed and rotation of the push member 2 relative to the insertion hole 3 can be prevented by inserting the push member 2, which has a hexagonal cross-section at least on the outer surface near the lower end, into an insertion hole 3 whose inner surface cross-section is hexagonal.

[0016] In these cases, the position of the lower end of the push member 2 is restricted to prevent it from slipping through the insertion hole 3 and coming into contact with the floor or ground, thus preventing it from dropping too low. At this time, the push member 2 is supported by a structure such as the anti-rotation structure 6 shown in Figures 4(a) and 4(b). In other words, a rod such as a bolt may be passed through the insertion hole 3 along its diameter, traversing the inside of the insertion hole 3, so that the lower end of the push member 2 comes into contact with the rod. Alternatively, a bottom surface may be formed at the bottom of the insertion hole 3 to block the insertion hole 3, thereby preventing the inserted push member 2 from being positioned further down, thus preventing the insertion hole 3 from being a through hole.

[0017] [Appearance of the conveying device of the present invention] Figure 3 shows an example of the conveying 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 the portion that extends linearly upward from the lower end. Above that, there is a curved portion 10. In the conveying device of Figure 3, the push member 2 has a curved portion 10, but it may have a curved portion 10, or it may be a straight tube or straight rod without a curved portion 10.

[0018] [Hand-pushed component] The push member 2 in this invention may be a rod-shaped object, or it may be a lighter, hollow pipe member. The cross-section of the push member in a plane perpendicular to the length direction may be circular, a polygon such as a square or hexagon, or an irregular shape.

[0019] [Curved section] The push member 2 may or may not have a curved portion 10. The case with a curved portion 10 is described below. The curved portion 10 is a curved section located above the straight section perpendicular to the lower end of the hand-pushing member 2, which is provided at least one of the four corners of the base plate 1. Therefore, the hand-pushing member 2 is not a straight line along its entire length as shown in Figure 1. The shape of the hand-pushing member, including the curved portion 10, is such that a part of its entire length resembles a straight pipe that has been bent. The curved portion 10 is not a straight pipe to which another disc-shaped or cylindrical member is attached to protect the hand. In the push members 2 provided on the base plate 1, at least two push members 2 that the user grips with their hands have a curved portion 10 between the lower end connected to the base plate 1 and the upper end. The curved portion 10 may appear as if the push member 2 is bent at an arbitrary angle, or it may be formed entirely of curves, such as an arc.

[0020] Examples of the push member 2 used in the present invention are shown in Figures 6 to 11. These figures are side views of the push member 2. However, shapes other than those exemplified may be used as long as the effects of the present invention can be achieved. Figure 6 shows the same shape as the push member 2 shown in Figure 3, and the curved section 10 is formed by bending or welding the push member 2 at an angle midway along its length. Below the push member 2, there is a cylindrical load protection section to protect the load. The curved section 10 in Figure 7 has a similar appearance to the curved section 10 shown in Figure 6, but it has a structure in which three straight pipes and two joints forming the slanted 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 a roughly U-shaped cross-section are integrated with 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 it has a structure in which three straight pipes are inserted into a connecting pipe E in which two pipes are adjacent and integrated with bolts B, rivets, etc. The curved section 10 in Figure 10 is a structure formed by bending the originally straight hand-pushing member 2 midway. Figure 10(b) is a view of the hand-pushing member 2 from above. The curved portion 10 in Figure 11 is formed by providing a double layer of the structure of the curved portion 10 shown in Figure 3. In Figure 11(b), which shows the push member 2 viewed from above, the push member 2 is first bent downwards in Figure 11(b) to form a curved portion 10-1, then bent 90° to the right from below to form a curved portion 10-2, then bent downwards in the length direction of the push member 2 to form a curved portion 10-3, and similarly bent further to form curved portions 10-4 and 10-5. Furthermore, structures integrated with bolts B, rivets, etc., are not designed to be disassembled during use, and therefore are not considered detachable structures. This is similar to how a steel frame structure of a building, etc., fixed with bolts, is not typically described as detachable.

[0021] As shown in Figure 3, in the push member 2, the straight section 2a is defined as the straight section that lies on the upward extension of the straight section fixed in the through hole 3 provided in the base plate 1. The straight section 2a is usually located below the curved section 10, but it may also be located above the curved section 10. The position of the curved portion 10 on the push member 2 is arbitrary and can be anywhere along the vertical direction of the push member 2 or at the upper end of the push member 2. When the position of the curved portion 10 is at the upper end of the push member 2, for example, in Figure 8, the structure consists of two straight pipes (excluding the uppermost straight pipe) and one connecting plate D with a roughly U-shaped cross-section, which are integrated together with bolts B or rivets. It is not necessary to place the curved portion 10 at a height that is clearly difficult for the user to grip. The lower end of the curved section 10 is the point where it connects to the straight section at the bottom. When the curved section 10 is located in the middle of the hand-pushing member 2 in the vertical direction, the upper end of the curved section 10 is the lower end of the straight section at the top, which is located further above it.

[0022] The user moves the conveying device by gripping the curved portion 10 provided on the push member 2 with their hand. Alternatively, if the outer diameter and shape of other parts of the conveying device are the same as or similar to the curved portion 10, the user can also move the conveying device by gripping the straight portion 2a above or below the curved portion 10. For example, when the load is heavy or when going up an incline, the user may grip the straight portion 2a above or below the curved portion 10 if they need to apply extra force. 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 ensure that the user's hand is protected. Furthermore, since the curved portion 10 is a part that protects the user's hand, when the user grips the curved portion 10 while the hand-pushing member 2 is attached to the base plate 1, it is necessary that the curved portion 10 be positioned inward in the left-right direction from the straight portion 2a below it. Also, if the straight portion 2a is located above the curved portion 10, it may be positioned inward from that straight portion. Furthermore, if the user grips the straight section 2a above or below the curved section 10, the push member 2 may be reinserted into the insertion hole 3 and fixed in place so that the outside of the curved section 10 is positioned outward from the straight section 2a in the left-right direction. For example, in Figure 3, each curved section 10 is at a 180° position, but this can be done by inserting the push member 2 into the insertion hole 3 so that they are at positions such as 0°, 45°, 315°, etc.

[0023] [Gripping part] As described above, the user may grip the curved portion 10 of the push member 2, or the straight portion 2a above or below the curved portion 10, and such gripping locations are specifically referred to as the gripping portion 11. Furthermore, as shown above and in Figure 5, the present invention allows the orientation of the curved portion 10 of the push member 2 to be arbitrarily changed. When a user grips the curved portion 10 provided on the push member 2 shown in Figure 3, the curved portion 10 becomes a gripping portion 11. In this case, the orientation of the curved portion 10 is such that, at the angle shown in Figure 2, it is directed toward the left and right center of the base plate, for example, between 90° and 270° relative to the insertion hole 3 that fixes the push member 2. In this case, the curved portion 10 can be positioned inward in the left and right direction from the straight portion of the push member 2, thus preventing injury by avoiding direct contact with objects such as pillars, walls, members, equipment, and devices, whose surfaces are not necessarily flat and which protrude toward the user at unpredictable heights.

[0024] Furthermore, for example, at 180°, between 90° and 270°, the curved portion 10, which is the gripping portion 11, is located at the furthest point from any object that protrudes toward the user. At around 225°, the position of the curved portion 10, which is the gripping portion 11, is inward and behind the straight portion of the hand-pushing member in the left-right direction, thus preventing contact from a wider range of directions. Moreover, at around 135°, when there is no load or only a small amount of load, contact from the left or right direction of the trolley can be prevented. Furthermore, the orientation of the hand-pushing member 2 fixed to the base plate may be set to the same angle as described above, or they may be set to any angle independently of each other. As a result, the manner in which the user's hands are protected can be changed for the left and right hands depending on the surrounding environment when the conveying device is moving.

[0025] As described above, when the user grips the push member 2, the gripping portion 11 may be located at a place other than the curved portion 10. For example, the user may grip the area below the curved portion 10 in Figure 12 with the gripping portion 11. In this case, for example as shown in Figure 12, the orientation of the curved portion 10 with respect to the insertion hole 3 to which the push member 2 is fixed is, for example, in the clockwise direction from 270 degrees to 90 degrees in Figure 2, and is directed outwards to the left and right of the base plate. In this case, the curved portion 10 is located outward in the left and right directions from the straight portion of the push member, so the hand is positioned inward in the left and right directions with respect to the object, with the curved portion 10 in between. In other words, the gripping portion 11 is not located on the outside in the left-right direction of the push member 2, but rather is positioned inside the straight outer surface or curved portion of the push member 2 in order to protect the user's hand when gripping it. When the push member 2 does not have a curved portion 10, the part that the user grips is the gripping portion 11.

[0026] [Cargo protection section] As shown in Figure 13a, one or more load protection sections 30 may be provided for each pusher member in the present invention. In Figure 13a, a cylindrical load protection section 30 is provided at the lower end of the pusher member 2, close to the base plate 1, but the installation location and shape of the load protection section 30 on the pusher member 2 are not particularly limited. However, it is necessary for the load protection section to be provided at a height below the upper end of the load.

[0027] The loading protection section 30 on the hand-pushing member may be located at an upper or lower position adjacent to the user's gripping height, or at a position further away from the user's gripping height. A position further away allows for protection of the loading from objects that are nearly flat relative to the conveying device, such as walls or pillars, and also protects the loading from materials and equipment located at a relatively low level outside the trolley, away from the user's gripping height, during trolley movement. Depending on the location, it may function not only to protect the loading but also to prevent injuries to the user's hands. The loading protection section 30 may be installed at the point where the push member 2 attached to the base plate 1 touches the base plate 1, at one or more locations on the lower, middle, and upper parts of the push member 2, or, if necessary, one each on the curved section 10, or on the top and bottom of the curved section 10. Since the purpose is to protect the load on the trolley, the upper limit of the loading protection section 30 should be the height of the load that is permitted in operation. The cross-section of the load protection section 30 shown in Figure 13a may be cylindrical with a circular shape, or it may be polygonal or irregular in shape. Furthermore, the cross-sectional shape may be constant in the vertical direction or irregular in shape.

[0028] The cargo protection section 30 has sufficient strength to protect the cargo and can be installed on the push member 2. It has a through hole 21 that penetrates the push member 2 and may be fixed to the push member 2 by some kind of fastener. Its shape may be annular or not, and it may be polygonal or irregular in shape. The structure for installing the cargo protection section on the push member can employ well-known fixing and attachment methods such as covering the push member, welding, or fixing or attaching it with bolts. This load protection section 30 may be provided on the push member 2 having the curved section 10 in the present invention, or it may be provided on a push member without a curved section as shown in Figure 1.

[0029] The cargo protection section 30 may be made of resin or metal, but it is preferable that it be made of resin. The outer diameter of the cargo protection section 30 may be approximately 100 mm to 250 mm, or it may be other. The cargo protection section 30 may also bulge out from the surface of the push member 2 to a height of 250 mm or less. The load protection section 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. Alternatively, the load protection section 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. As a means of fixing the load protection section 30 to prevent rotation, well-known fixing methods such as bonding, welding, or bolting to the push member can be used.

[0030] [ring-shaped body] As one form of the above-mentioned load protection section 30, an annular body 20 as shown in Figure 13a can be adopted. As shown in Figure 14, the hand pusher 2 is passed through the through hole 21 of the annular body 20, and the annular body 20 is not fixed to the hand pusher 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 annular body 20 is made sufficiently larger than the outer diameter of the hand pusher 2, so that a gap 22 is formed between the inner surface of the through hole 21 and the outer surface of the hand pusher. This gap 22 allows the annular body 20 to rotate freely when the hand pusher 2 is passed through the through hole 21. When the annular body 20 provided on the push member 2 comes into contact with a wall, column, etc., the annular body 20 rotates due to friction between the wall, etc. and the end of the annular body. This rotation prevents the load of the conveying device from coming into contact with the wall. Furthermore, compared to the case where it does not rotate, the rotation reduces friction and impact, thus preventing the surface of the annular body 20 from excessively sliding against the wall surface. As a result, it has the effect of preventing 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, column, etc. due to sliding and soiling their surfaces.

[0031] To provide the annular body 20, a rod-shaped object 23, such as a bolt, is fixed to the push member 2, passing through it radially. The size of this fixed rod-shaped object 23 is such that it does not fit into 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 be in contact with the push member 2 at the position where the annular body 20 is provided at an oblique angle. As a result, the annular body 20 itself will also be in an oblique position relative to the push member, but it will still be able to perform the above-mentioned function effectively.

[0032] In any case, the lower surface of the ring-shaped body 20 is always supported by the rod-shaped object 23 and does not move below the rod-shaped object 23. In this case, depending on the shape of the curved section 10 and the degree of the gap, the annular body 20 can be separated from the push member 2 by pulling it upwards. In this case, maintenance of the annular body 20 can be performed more easily. In Figure 14, the rod-shaped object 23 is provided only below the annular body 20, but a rod-shaped object 23 may also be provided above the annular body 20. In this case, the annular body 20 between the two rod-shaped objects 23 can rotate freely at that point.

[0033] 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 to prevent loss even if it is separated from the hand-pushed member 2 at a construction site or civil engineering site. For example, the outer diameter of the annular body 20 may be 100 mm or more, or it may be 120 mm or 80 mm or more. The material constituting the outer circumferential surface of the annular body 20 is preferably formed from a resin composition such as urethane resin. The entire annular body 20 may be formed from the urethane resin or the like, or the inner surface portion of the ring that forms the through hole 21 may be formed from metal, a hard resin, or other material. Furthermore, the parts of the annular body 20 other than the inner surface portion of the ring that forms the through hole 21 and the outer circumferential surface may be composed of 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 circumferential surface.

[0034] The conveying device of the present invention may also be provided on the hand-pushing member 2 with a load protection section 30, which is an annular body 20 that can rotate around the central axis of the through hole 21, not only to protect the load, but also, if necessary, to prevent the user's hands, etc., from coming into contact with walls, pillars, materials, equipment, etc. at construction sites or building sites. In the present invention, especially when the push member 2 has a curved portion 10, even if the push member 2 has an annular body 20, the push member 2 will not rotate and move even if only the push member 2 is left on an inclined floor surface.

[0035] As shown in Figure 17, when the push member 2 is provided with a branch portion 24, the side of the push member 2 with the branch portion 24 always faces the center of the trolley, 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 Figure 13a does not have to be annular. As shown in Figure 13b, the annular body may have a cross-section that is not a circle, but a sector with an arbitrary central angle such as 180 degrees or 90 degrees, and its center may be fixed relative to the push member so that it is directly above the branch portion 24, rather than being able to rotate. In this case, regardless of which insertion hole the push member 2 is inserted into, the sector-shaped member can be positioned outside the trolley from the push member 2, or in some cases, facing inward towards the trolley, and function as a load protection part 30. In addition, since it is not an annular body 20, even if only the push member 20 removed from the trolley is placed on the floor, etc., the push member will not rotate or twist due to the presence of the branch portion 24. Therefore, it will not be moved unnecessarily, even during transport. Even if the cargo protection section 30 has a triangular or irregular cross-section instead of the fan shape described above, if it is fixed so that it is in the same direction as the branch portion 24 is formed on the push member 2, it can perform the same function as when it is fan-shaped.

[0036] The load protection section 30 may be provided on a push member 2 that does not have a curved section 10, as shown in Figure 1, rather than the push member 2 having a curved section as described above. When the load protection section 30 is an annular body 20 that can rotate around the central axis of the through hole 21, it may be fixed to the push member 2 as described above, or it may be rotatably provided on the push member 2. In this case, the position where the annular body 20 etc. is provided on the push member may be at least one of the upper or lower sides of the gripping section 11, or it may be a position away from the gripping section 11. By providing an annular body 20 at the upper or lower part adjacent to the gripping portion 11, not only the load on the conveying device, walls, and pillars can be protected, but also the user's hands, etc.

[0037] [User Protection Department] Along with the curved portion 10, a user protection portion 40 can be provided in combination with the curved portion 10, as shown in Figure 13a, or in a push member 2 without a curved portion 10 as shown in Figure 1, for example, as provided on the left push member 2. The shape of the user protection portion 40 may be the same as that of the load protection portion 30. Its shape may be cylindrical with an annular cross-section, and it can be provided on the push member 2 by inserting the push member 2 into its hole. The user protection portion 40 may be rotatably attached to the push member 2, or it may be fixed. The shape of the user protection portion 40 may be cylindrical, similar to the load protection portion 30 described above, and the outer shape of the cross-section may be polygonal or any irregular shape. If a user protection section 40 is provided, one or more may be provided for each push member. This user protection section 40 may be provided in addition to, or in place of, the load protection section 30 and / or the annular body 20. The location of the user protection part 40 on the push member 2 is not particularly limited, but in order to further protect the user, that is, to provide stronger protection for the hand that the user grips the push member 2, it is preferable to place it adjacent to the curved portion 10 and / or the gripping portion such as the curved portion 10, or to the gripping portion if there is no curved portion 10, and to be close to the hand when in use, as shown on the left push member 2. In Figure 13, the user protection part 40 is provided on only one push member 2, but it may be provided similarly on the other three push members 2 as well. In the push member 2, the area adjacent to the part that is gripped by the hand functions exclusively as a user protection part.

[0038] If a curved portion 10 is present, the user protection portion 40 works together with the curved portion 10 to protect the user's hand. Depending on the relationship between the direction of movement of the conveying device and the position of the contacting member, the curved portion 10 can be used as a gripping portion 11, or the upper or lower part of the curved portion 10 can be used as a gripping portion 11. In that case, the user protection portion 40 can be arbitrarily provided above or below the gripping portion. In Figure 13a, when the user grips the curved portion 10 with their hand, user protection parts may be provided above and below the curved portion 1 of the push member, or they may be provided on either side. This user protection section 40 may be provided on the push member 2 having a curved portion in the present invention, or it may be provided on a push member without a curved portion as shown in Figure 1. Furthermore, the various load protection parts and user protection parts other than the curved section may be detachably attached to the push member 2, or they may be integrated with bolts, rivets, etc., to prevent them from being detached.

[0039] As shown below, when the push member 2 is provided with a branch portion 24, the side of the push member 2 with the branch portion 24 will always face the center of the trolley, regardless of which insertion hole the push member 2 is inserted into. Even in this case, the user protection portion 40 can be the same shape and method of installation as described above. Depending on the shape, the user protection portion 40 may be rotatably attached to the push member 2 or fixed in place. Furthermore, the user protection section 40 may have a sector-shaped cross-section, similar to the load protection section 30, and the central angle of the sector can be arbitrarily adjusted. The central angle may be determined within the range of 90 to 270 degrees, or any other angle. The fan-shaped portion may be fixed to the push member rather than rotatably, so that it is positioned outside the trolley from 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 trolley from the push member 2 and will function as the user protection portion 40. In addition, since it is not an annular body 20, even if only the push member 20 removed from the trolley is placed on the floor or the like, the presence of the branch portion 24 prevents the push member from rotating or turning. Therefore, it will not move unintentionally, even during transport. Even if the cargo protection section 30 has a triangular or irregular cross-section instead of the fan shape described above, if the user protection section 40 is fixed to the part of the trolley facing outwards at the location where the branch portion 24 is formed on the push member 2, it can perform the same function as when it is fan-shaped.

[0040] [Display of loading height] When using the conveying device of the present invention, the curved portion 10 of the hand-pushing member in the present invention, as shown in Figure 8, for example, may be positioned at any height from the top surface of the trolley. The height of the load can be checked using each part of the hand-pushing member in the present invention as a guide.

[0041] [Branch section] Figure 15 shows that a branch portion 24 is provided on the lower side of the push member 2. The branch portion 24 is bent downwards and has a gap between it and the surface of the push member 2. The means of providing the branch portion 24 to the push member 2 are not particularly limited; the branch portion 2 may be fixed to the push member 2 by drilling a through hole in the push member 2, or it may be welded to the push member 2, or other means may be used. The shape of the branch may be a rod-like shape with a circular cross-section as shown in Figure 15, or the cross-section may be any shape such as a square or ellipse. When inserting the lower part of the push member 2 into the insertion hole 3 of the trolley, the branch portion 24 is positioned on the outer surface of the insertion hole 3 and facing approximately the center of the loading surface of the trolley. At the same time, a curved portion 10 is provided on the push member 2 so as to curve in the same direction as the branch portion 24 protruding from it. As shown in Figure 16, the lower part of the push member 2 having the curved portion 10 is inserted into the insertion hole 3 of the trolley, and a branch portion 24 extending downward from the side of the push member 2 is provided on the outer surface above the portion that is inserted into the insertion hole 3 of the trolley at the lower part of the push member 2 so that the curved portion 10 can be directed toward the center of the trolley. When inserting the lower part of the push member 2 into the insertion hole 3 of the trolley, the branch portion 24 is inserted into the space 25 adjacent to the outer surface of the insertion hole 3 and facing approximately the center of the loading surface of the trolley. As a result, the curved portion 10 is provided at the same position as the branch portion 24 protruding in the longitudinal direction of the push member 2.

[0042] Figure 17 shows a similar diagram in which push members 2 are provided at the four corners of the trolley. The curved portions 10 of the four push members 2, which are inserted into the four insertion holes 3 and provided on the trolley, can be curved toward the approximate center of the loading surface of the trolley. In this case, it is preferable that, when viewed from the longitudinal 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 trolley), 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. 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 trolley, regardless of whether it is used on the user's right or left side. Furthermore, the curved portion 10 of the push member 2 provided on the trolley is positioned not at a location that extends from the edge of the trolley to the left or right sides, front or rear, but rather in a direction toward approximately the center of the trolley from the push member 2. As a result, it is possible to prevent the hand gripping the curved portion 10 from hitting obstacles, pillars, walls, etc., and getting injured during use. Furthermore, by providing the pusher member 2 on the trolley, the curved portion 10 of the pusher member 20 can be positioned appropriately at the same time.

[0043] As shown in Figure 17, a connector 32 may or may not be provided between the two push members. Also, although the connector 30 is shown on the outside of the trolley between the two push members in Figure 17, it may be provided on the inside. For example, a rod-shaped member or pipe-shaped member may be fixed horizontally at any position on each of the two push members that a person pushes with both hands during use, using a well-known means such as a clamp 31. A connector 32 of this shape may be equipped with a plate displaying information about the trolley and the cargo (such as the name of the cargo, the amount of cargo, the destination, the schedule, and the person in charge), as well as storage containers such as boxes or bags for storing small items or garbage. Furthermore, the connector 32 can also be gripped and pressed.

[0044] Similar to the hand-pushing member having the curved section 2 described above, a load protection section and, optionally, a user protection section can be provided. The load protection section can be provided at a height between the surface of the base plate and the top of the load. Furthermore, the various load protection sections other than the curved section and the user protection section may be detachably attached to the hand-pushing member 2, or they may be integrated with bolts, rivets, etc., to prevent them from being detached. In the present invention, the user protection part 40 functions reliably when it is located adjacent to the gripping part 11 of the push member 2, to the extent that it barely touches the hand when the gripping part 11 is held by the hand. The load protection part 30, located further away from the hand than the adjacent part in this manner, functions solely as a part that protects the load. [Explanation of symbols]

[0045] 1 base plate 2 Pushing Member 3 Insertion hole 4 casters 5 recesses 6. Anti-rotation structure 7 recesses 10 Curved section 11 Gripping part 20 Ring-shaped bodies 21 Through hole 22 Gap 23. Rod-shaped object 30 Load protection section 40 User Protection Department

Claims

1. A conveying device comprising a base plate equipped with casters, the lower end of a push member inserted into a hole provided in at least one corner and fixed therein, the push member having one or more load protection parts.

2. The conveying device according to claim 1, wherein the load protection portion of the push member has a through hole, and the push member is provided through the through hole.

3. The conveying device according to claim 1 or 2, wherein the load protection portion of the push member has a through hole, and the inner diameter of the through hole is larger than the outer diameter of the push member.

4. The conveying device according to claim 3, wherein the load protection portion of the push member is rotatable relative to the push member.

5. The conveying device according to claim 1 or 2, wherein the load protection portion bulges out to a height of 250 mm or less relative to the surface of the push member.

6. The conveying device according to claim 1 or 2, wherein the push member has a branch portion at its lower part.

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