Push bar on a transport cart

Abstract

To provide a push bar for a transport cart. [Solution] In a transport trolley that is driven by pushing a push bar by hand, which is attached in an inserted state to upper-opening socket portions arranged at each corner of the loading platform, the push bar (7) comprises a support column (16) that stands upright from an insertion portion (16a) inserted into the socket portion (6), and a grip portion (17) extending from the upper end of the support column (16). The insertion portion (16a) of the support column (16) is fixed by a positioning means (18) so as not to rotate around an axis relative to the socket portion (6), and the grip portion (17) is positioned offset from the support column (16) toward the inside of the corner region (W) between the side edges (X)(Y) of the corner portion, and is configured so that the fingers of the worker gripping the grip portion (17) do not protrude outside the corner region (W).

Description

Technical Field

[0001] The present invention relates to a push bar in a transport cart.

Background Art

[0002] Transport carts are used to transport construction materials and various articles, and FIGS. 1 and 2 show known transport carts.

[0003] The transport cart forms a loading platform 3 framed by side frames 1, 1 and end frames 2, 2 so as to be surrounded by a rectangular outline, and a caster device 4 is vertically provided on the lower surface. On the upper surface of the loading platform 3, a load receiving surface 5 for loading the load is formed. Incidentally, usually, with respect to the edge of a rectangular article, the edge of the long side is referred to as the "side frame side", and the edge of the short side is referred to as the "end frame side". However, since the loading platform of the transport cart may be square, in this specification, it should be understood that the terms "side frame side" and "end frame side" do not mean sides with different lengths.

[0004] Socket portions 6 with open tops are provided at each corner portion of the loading platform 3, and a push bar 7 consisting of a single pipe is attached in an inserted state to the socket portions 6, and the transport cart is configured to travel when an operator pushes the push bar 7 by hand.

[0005] As shown in FIG. 2, a corner fitting 8 is provided at the corner portion. The corner fitting 8 includes a side frame side fixing portion 9 for fixing the end portion of the side frame 1 in an inserted state and an end frame side fixing portion 10 for fixing the end portion of the end frame 2 in an inserted state, and a socket portion 6 having a cylindrical through hole 6a formed between the side frame side fixing portion 9 and the end frame side fixing portion 10 is provided. Incidentally, a guard member 11 functioning as a bumper is attached to the outer surface of the socket portion 6.

[0006] Thereby, a corner region W is formed between the side frame side edge X along the side frame 1 and the end frame side edge Y along the end frame 2 at the corner portion of the loading platform 3, and the corner region W constitutes a part of the load receiving surface 5.

[0007] Therefore, the push bar 7, which is made of a single pipe, is installed in a state where it can be freely inserted into and removed from the through hole 6a of the socket part 6. At this time, a receiving member 12 is provided at the bottom of the socket part 6 to close a part of the through hole 6a, thereby receiving the lower end of the inserted push bar 7 and installing the push bar 7. In the illustrated example, the receiving member 12 is formed by a bolt that crosses the through hole 6a, but it may also be formed by a cap member that closes the through hole 6a from below.

[0008] The push bars 7 are erected at each corner of the loading platform 3 to allow the transport cart to be pushed by hand while it is moving. However, when not needed, they can be separated from the socket 6 simply by pulling them out. This allows the transport cart to be stored as flatbed carts with the push bars 7 removed, stacked on top of each other, when not in use.

[0009] By the way, when moving the transport cart while pushing the hand bar 7 erected on the socket part 6, there is a risk that the fingers of the worker gripping the hand bar 7 may come into contact with the surrounding building walls or other obstacles and be injured.

[0010] Since the push bar 7 rises from a socket portion 6 provided between the girder-side fixing portion 9 and the end-side fixing portion 10 of the corner fitting 8, the fingers of the worker gripping the push bar 7 will extend outward from the corner area W. Therefore, there is a risk that an obstacle may collide with the fingers that extend beyond the corner area.

[0011] Therefore, to solve this problem, it has been proposed to provide a protective member on the push bar, and to provide this protective member with a grip portion for the worker to hold with their hand, as well as a flange portion to protect the worker's fingers (Patent Document 1). [Prior art documents] [Patent Documents]

[0012] [Patent Document 1] Patent No. 7414298 [Overview of the project] [Problems that the invention aims to solve]

[0013] In the prior art (Patent Document 1), as shown in Figure 3, a protective member 13 is provided on the push bar 7, and the protective member 13 consists of a grip portion 14 that the worker grasps with their hand, and flange portions 15, 15 that are positioned above and below the grip portion 14 and arranged around it.

[0014] According to this explanation, the flange portion 15 protrudes significantly outward from above and below the fingers of the worker gripping the grip portion 14. Therefore, when approaching an obstacle in the surrounding area, the flange portion 15 comes into contact with the obstacle, preventing the fingers from coming into contact with the obstacle.

[0015] However, in the case of the conventional technology, as shown in Figure 3(B), when the protective member 13 is attached to the push bar 7 located at the corner of the loading platform 3, the flange portion 15 protrudes significantly outward from the corner area W of the loading platform 3.

[0016] As a result, the flange portion 15 can get in the way, making it impossible to travel through narrow passages. In other words, even if the width of the loading platform 3 is just enough to pass through a narrow passage, if the flange portion 15 is present that would collide with the obstacle walls on either side of the passage, it becomes impossible to pass. Therefore, the cumbersome task of removing the protective member 13 from the push bar 7 is required each time. Furthermore, removing the protective member 13 puts the hands and fingers at risk.

[0017] Furthermore, in conventional technology, the flange portion 13 is used as a shield to protect the worker's hands and fingers when colliding with or coming into contact with an obstacle, which may lead to severe wear and tear on the flange portion 13 and premature failure.

[0018] The present invention aims to provide a push bar for a transport cart that solves the above-mentioned problems. [Means for solving the problem]

[0019] Therefore, the present invention is configured as a means, comprising a loading platform framed in a rectangular shape, and for the socket portions with upper openings disposed at each corner portion of the loading platform, in a carrier that can be run by pushing by hand a push bar attached in an inserted state, the push bar includes a column portion that stands upward from an insertion portion inserted into the socket portion, and a grip portion extending from an upper end portion of the column portion, the insertion portion of the column portion is fixed by positioning means so as not to rotate around an axis with respect to the socket portion, the grip portion is provided at a position offset from the column portion toward the inside of a corner region between both side edges of the corner portion, and the fingers of an operator holding the grip portion are configured not to protrude outside the corner region.

[0020] The grip portion offset from the column portion is preferably disposed near a bisector of a corner angle at a corner portion of the loading platform.

[0021] The grip portion preferably includes identification means that can be identified from the column portion with the naked eye.

[0022] In an embodiment of the present invention, the positioning means of the column portion is constituted by locking means that locks against the axial rotation direction of the insertion portion, in the mutual relationship between a receiving member provided at the bottom of the socket portion and a lower end portion of the insertion portion of the push bar.

[0023] In another embodiment of the present invention, the positioning means is provided on an outer peripheral portion near the insertion portion of the push bar, and is constituted by hook means that locks to the socket portion to prevent rotation of the insertion portion when the insertion portion is inserted into the socket portion.

[0024] In an embodiment of the present invention, by bending a single metal pipe material, the grip portion is integrally extended to the column portion.

[0025] Another embodiment of the present invention is formed by two metal pipe materials to form the support portion and the grip portion respectively. The lower end portion of the grip portion is overlapped with the upper end portion of the support portion in a parallel state and fixed to each other.

[0026] Still another embodiment of the present invention is configured by connecting the support portion and the grip portion with a joint member. The joint member fixes the upper end portion of the support portion to one end in the lateral direction and the lower end portion of the grip portion to the other end.

[0027] Still another embodiment of the present invention is configured by forming the support portion with a metal pipe material and connecting a grip structure body provided with a grip portion to the upper end portion of the support portion. The grip structure body fixes the end portion of the displacement configuration portion extending from the grip portion to the upper end portion of the support portion.

Advantages of the Invention

[0028] The push bar 7 of the present invention displaces the grip portion 17 from the support portion 16 erected on the socket portion 6, arranges it inside the area of the corner portion of the loading platform, and is configured so that the fingers of the operator holding the grip portion 17 do not protrude outside the area of the corner portion. Therefore, when the transport cart is running, the fingers will not contact surrounding obstacles and be injured, and the work can be carried out safely.

Brief Description of the Drawings

[0029] [Figure 1] It is a perspective view showing a transport cart according to the prior art. [Figure 2] ]>Regarding the corner portion of the loading platform in the prior art, (A) is a partially enlarged perspective view, and (B) is a perspective view showing a corner fitting and a guard member. [Figure 3] Regarding the prior art provided with a protection member for protecting the fingers of an operator, (A) is a front view and (B) is a plan view. [Figure 4] It is a perspective view showing a transport cart equipped with a push bar according to the first embodiment of the present invention. [Figure 5]With respect to a transport cart equipped with a push bar according to the first embodiment, (A) is a front view and (B) is a top view. [Figure 6] The diagram shows the position of the grip portion offset from the support column of the push bar; (A) is a perspective view and (B) is a plan view. [Figure 7] Regarding the direction and position of the displaced grip portion, (A) is a plan view showing an undesirable example, and (B) is a plan view showing a desirable example. [Figure 8] A second embodiment relating to the displacement configuration of the push bar is shown, where (A) is an exploded perspective view and (B) is a front view. [Figure 9] A third embodiment relating to the displacement configuration of the push bar is shown, where (A) is an exploded perspective view and (B) is a front view. [Figure 10] A fourth embodiment relating to the displacement configuration of the push bar is shown, where (A) is an exploded perspective view and (B) is a front view. [Figure 11] A fifth embodiment relating to the displacement configuration of the push bar is shown, where (A) is an exploded perspective view and (B) is a front view. [Figure 12] Another embodiment of a push bar that can be made using scaffolding pipes is shown, with (A) being a perspective view and (B) being a plan view. [Figure 13] Regarding another embodiment of the push bar, different specific examples are shown, where (A) is a front view of Example 1, (B) is a front view of Example 2, (C) is a front view of Example 3, and (D) is a front view of Example 4. [Figure 14] This is a perspective view partially showing the transport cart, with respect to the positioning means for the push bar. [Figure 15] The first embodiment of the positioning means is shown, where (A) is a perspective view showing the upper part of the socket before the insertion part is inserted, (B) is a perspective view showing the lower part, and (C) is a perspective view showing the state in which the receiving material and the locking means of the insertion part are locked together. [Figure 16] A second embodiment of the positioning means is shown, where (A) is a perspective view showing the lower part of the socket before the insertion part is inserted, (B) is a perspective view showing the state before the locking means of the receiving material and the insertion part are locked together, and (C) is a perspective view showing the state after they are locked together. [Figure 17] A third embodiment of the positioning means is shown, where (A) is a perspective view showing the upper part of the socket before the insertion part is inserted, and (B) is a perspective view showing the state in which the insertion part is inserted into the socket and the hook means is locked to the socket. [Modes for carrying out the invention]

[0030] Figures 4 to 17 show preferred embodiments relating to a transport cart and push bar according to the present invention.

[0031] (Transport cart) Since the transport trolley is constructed in the same manner as the known technology shown in Figures 1 and 2 and the prior art shown in Figure 3, the same reference numerals are used to refer to the above explanation, and the above explanation is omitted to avoid redundancy.

[0032] (Push pole) As shown in Figures 4 to 7, in the present invention, the push bar 7 comprises a support column 16 erected on the socket portion 6 at each corner of the loading platform 3 of the transport cart, and a grip portion 17 extending from its upper end.

[0033] The push bar 7 is attached to the loading platform 3 by inserting the insertion portion 16a at the lower end of the support column 16 into the socket portion 6, and in this state, the worker moves the transport cart by pushing the grip portion 17 by hand. In other words, when the push bar 7 is attached with the insertion portion 16a inserted into the socket portion 6, the insertion portion 16a can be easily removed from the socket portion 6.

[0034] The support column 16 rises upward from the insertion portion 16a inserted into the socket portion 6, and a grip portion 17 extends from the upper end of the support column 16. In this case, the grip portion 17 is positioned offset from the support column 16 toward the interior of the corner area W of the cargo bed 3, as shown by arrow M in Figure 4.

[0035] In this case, the insertion portion 16a of the support column 16 is fixed by the positioning means 18 so as not to rotate around the axis relative to the socket portion 6.

[0036] Therefore, the worker can move the transport cart by pushing the two push bars 7, 7 located on the front side of the loading platform 3. At that time, the worker's fingers gripping the grip portion 17 are positioned within the area W of the corner of the loading platform 3, without extending outside the area W. Consequently, even if the transport cart is moved incorrectly and the frames 1, 2 or guard members 11 of the loading platform 3 collide with or come into contact with surrounding obstacles, the worker's fingers gripping the grip portion 17 will not come into contact with the obstacles.

[0037] Therefore, although not shown in the illustration, it is preferable to provide the grip portion 17 with an identification means that can be visually identified from the support portion 16. This prevents workers from accidentally gripping the support portion 16 when pushing the transport cart by hand, and serves as a reminder to always grip the grip portion 17. The identification means can be made of, for example, coloring, patterns, or other identifiable elements, and can be implemented by painting the grip portion 17, attaching a film, or covering it with a cap.

[0038] As described above, the push bar 7 has important technical features in (1) a configuration in which the grip portion 17 is connected to the upper end of the support portion 16 in an offset position (offset configuration) and (2) a configuration of positioning means to prevent the support portion 16 from rotating around its axis (positioning configuration). Accordingly, embodiments relating to the offset configuration and the positioning configuration will be described below.

[0039] (First embodiment relating to the displacement configuration of the push bar) Figures 4 to 7 show a first embodiment relating to the displacement configuration of the push bar 7.

[0040] The push bar 7 is constructed by bending a single metal pipe, thereby integrally extending the grip portion 17 from the support portion 16. In this case, the single metal pipe can be a standard single pipe that has been provided for push bars for some time.

[0041] During bending, the metal pipe material is configured such that a support column 16 is formed by a shaft portion at a predetermined height from the lower end, an intermediate portion 16b having a predetermined shaft length continuing from the support column 16, and a grip portion 17 extending from the intermediate portion 16b to the upper end. The intermediate portion 16b is then bent so as to bend diagonally upward from the support column 16, and the grip portion 17 is bent so as to extend vertically upward from the intermediate portion 16b.

[0042] As a result, the push bar 7 has an inclined intermediate section 16b between the support column 16 and the grip section 17, and therefore the grip section 17 is offset from the support column 16 via the intermediate section 16b.

[0043] In this configuration, the support columns 16 rise from the socket portions 6 at each corner of the cargo bed 3, ensuring a sufficient area for the load-receiving surface 5 surrounded by the four support columns 16. Furthermore, in the height direction, a sufficient loading space is secured up to the bent intermediate portion 16b.

[0044] When the lower end insertion portion 16a of the push bar 7 is inserted into the socket portion 6 at each corner of the loading platform 3, the positioning means 18 (described later) positions and fixes the position of the support portion 16 in the axial direction. As a result, as shown in Figure 6, the grip portion 17 is positioned offset from the support portion 16 toward the interior of the corner area W of the loading platform 3.

[0045] In this case, it is preferable that the grip portion 17 be positioned on the line of the angle bisector T of the corner of the cargo bed 3, as shown in Figure 6(B). This ensures that the distance of the grip portion 17 from the girder side edge X of the corner is equal to the distance from the end side edge Y, and that it is positioned in the center of the area W that is least likely to be hit by an obstacle.

[0046] In the first embodiment, as shown in Figure 6(B), the amount of displacement (distance) L of the grip portion 17 that is displaced from the support portion 16 can be made larger than the outer diameter D of the pipe of the support portion 16 by setting the length of the intermediate portion 16b (in the illustrated embodiment, L is approximately three times D), thereby allowing the grip portion 17 to be sufficiently isolated from both edges X and Y of the corner portion.

[0047] Incidentally, with the configuration in which the grip portion 17 is positioned on the line of the corner angle bisector T, as shown by arrows X and Y in Figure 4, the safety of the hands and fingers of the worker gripping the left and right push bars 7, 7 is ensured whether the transport trolley is driven in the longitudinal direction of the girder side frame 1 or in the longitudinal direction of the end side frame 2.

[0048] Incidentally, the present invention is not limited to positioning the grip portion 17 on the line of the angle bisector T of the corner of the cargo bed 3, but rather it is sufficient to position it inside the area W of the corner and configure it so that the fingers of the worker gripping the grip portion 17 do not extend outside the area W of the corner.

[0049] For example, as shown in Figure 7(A), even within the area W of a corner section, if grips 17x and 17y, indicated by dashed lines, are positioned overlapping the girder side edge X and end edge Y, the fingers gripping them will extend beyond the girder side frame 1 and end frame 2, which is undesirable.

[0050] In contrast, when grips are positioned inward from the girder edge X and end edge Y, as shown by the dashed lines in Figure 7(B), and do not overlap with the girder frame 1 or end frame 2, the fingers gripping them will not extend beyond the outside of the girder frame 1 or end frame 2, thus fulfilling the intended purpose.

[0051] Therefore, the grip portion 17 must be (1) positioned offset from the support portion 16 toward the interior of the corner region W between the girder side edge X and the end side edge Y of the corner portion, and (2) configured so that the fingers of the worker gripping the grip portion 17 do not extend beyond the outside of the corner region W. The configuration of (2) can be achieved by positioning the grip portion 17 in a position that does not overlap with the girder side frame 1 or the end side frame 2, as shown in Figure 7(B).

[0052] (Second embodiment relating to the displacement configuration of the push bar) Figure 8 shows a second embodiment relating to the displacement configuration of the push bar 7.

[0053] The push bar 7 is constructed by connecting the support column 16 and the grip portion 17 with a joint member 19A.

[0054] The support column 16 and the grip section 17 can be made by cutting a single pipe; the longer pipe can be used as the support column 16, and the shorter pipe can be used as the grip section 17.

[0055] The joint member 19A has a base 20 made of, for example, synthetic resin or alloy, with a downward-facing connecting pipe 21 protruding from one of its lateral ends and an upward-facing connecting pipe 22 protruding from the other end.

[0056] Therefore, the push bar 7 is provided by fitting the downward connecting pipe 21 to the support column 16 and fixing it in place while preventing rotation by the anti-rotation fixing means 23, and fitting the upward connecting pipe 22 to the grip portion 17 and fixing it in place.

[0057] As a result, when the insertion portion of the support column 16 of the push bar 7 is inserted into the socket portion 6 of the loading platform 3, the grip portion 17 is positioned offset from the support column 16 toward the interior of the corner area W of the loading platform 3.

[0058] (Third embodiment relating to the displacement configuration of the push bar) Figure 9 shows a third embodiment relating to the displacement configuration of the push bar 7.

[0059] The push bar 7 is constructed by connecting the support column 16 and the grip portion 17 with a joint member 19B.

[0060] The support column 16 and the grip section 17 can be made by cutting a single pipe; the longer pipe can be used as the support column 16, and the shorter pipe can be used as the grip section 17.

[0061] The joint member 19B is a single-piece structure made of, for example, synthetic resin or alloy, and has a first pipe section 24 and a second pipe section 25 that penetrate vertically side by side, with a rectangular tube section 26 formed between the two pipe sections.

[0062] Therefore, the upper end of the support column 16 is fitted into the first pipe section 24 and fixed by screwing the bolt 27 through it into the nut 28, and the lower end of the grip section 17 is fitted into the second pipe section 25 and fixed by screwing the bolt 27 through it into the nut 28, thereby providing the push bar 7. The nut 27 is loaded into the square tube section 26 and configured to have the bolt 27 through it screwed into it. As a result, when the insertion portion of the support column 16 of the push bar 7 is inserted into the socket portion 6 of the loading platform 3, the grip portion 17 is positioned offset from the support column 16 toward the interior of the corner area W of the loading platform 3.

[0063] (Fourth embodiment relating to the displacement configuration of the push bar) Figure 10 shows a fourth embodiment relating to the displacement configuration of the push bar 7.

[0064] The push bar 7 is constructed by connecting the support column 16 and the grip portion 17 with a joint member 19C.

[0065] The support column 16 and the grip section 17 can be made by cutting a single pipe; the longer pipe can be used as the support column 16, and the shorter pipe can be used as the grip section 17.

[0066] The joint member 19C is formed, for example, by connecting two pipe fittings in an L-shape. Specifically, a core pipe 31 is inserted between the first pipe fitting 29 and the second pipe fitting 30 and fixed with fasteners 32 such as screws, with the opening of the first pipe fitting 29 facing downwards and the opening of the second pipe fitting 30 facing upwards.

[0067] Therefore, the upper end of the support column 16 is inserted into the downward opening of the first pipe joint 29 and secured with fasteners 32 such as screws, and the lower end of the grip portion 17 is inserted into the upward opening of the second pipe joint 30 and secured with fasteners 32 such as screws, thereby providing the push bar 7.

[0068] As a result, when the insertion portion of the support column 16 of the push bar 7 is inserted into the socket portion 6 of the loading platform 3, the grip portion 17 is positioned offset from the support column 16 toward the interior of the corner area W of the loading platform 3.

[0069] (Fifth embodiment relating to the displacement configuration of the push bar) Figure 11 shows a fifth embodiment relating to the displacement configuration of the push bar 7.

[0070] The push bar 7 is constructed by forming the support column 16 from a metal pipe and connecting a grip assembly 33, which has a grip portion 17, to the upper end of the support column 16.

[0071] The grip component 33 is made of, for example, synthetic resin or alloy, and integrally includes an offset component 34 extending laterally from the lower end of the grip component 17, with a downward-facing shaft portion 35 formed at the end of the offset component 34.

[0072] Therefore, the downward-facing shaft portion 35 is inserted into the upper end of the support column portion 16 and fixed with fasteners 36 such as screws, thereby providing the push bar 7.

[0073] As a result, when the insertion portion of the support column 16 of the push bar 7 is inserted into the socket portion 6 of the loading platform 3, the grip portion 17 is positioned offset from the support column 16 toward the interior of the corner area W of the loading platform 3.

[0074] (Another embodiment relating to the displacement configuration of the push bar) Figure 12 shows another embodiment of the displacement configuration of the push bar, and an embodiment that embodies this embodiment is shown in Figure 13.

[0075] As shown in Figure 12, the push bar 7 can be formed by cutting a single pipe, with the longer pipe forming the support section 16 and the shorter pipe forming the grip section 17.

[0076] In this process, the lower end of the grip portion 17 is superimposed on the upper end of the support portion 16, and the two are fixed together with their axes parallel to each other.

[0077] As a result, when the insertion portion of the support column 16 of the push bar 7 is inserted into the socket portion 6 of the loading platform 3, the grip portion 17 is positioned offset from the support column 16 toward the interior of the corner area W of the loading platform 3.

[0078] In this case, it is preferable that the grip portion 17 be positioned on the line of the angle bisector T of the corner of the cargo bed 3, as shown in Figure 12(B). This ensures that the grip portion 17 is positioned in the center of the area W where it is least likely to be hit by an obstacle, with the distance from the girder edge X of the corner equal to the distance from the end edge Y.

[0079] In this embodiment, as shown in Figure 12(B), the displacement (distance) L of the grip portion 17 that is displaced from the support portion 16 is equal to the outer diameter D of the pipe of the support portion 16, and the distance from both edges of the corner portion (girder side frame 1 and end side frame 2) is relatively small. Combined with the fact that it is positioned on the line of the bisector T, at least the fingers of the worker gripping the grip portion 17 will not protrude outside the edges X and Y of the corner portion (girder side frame 1 and end side frame 2), thus achieving the intended purpose of the invention.

[0080] (Example 1) In the embodiment shown in Figure 13(A), the lower end of the grip portion 17 is superimposed on the upper end of the support portion 16, and the axes of the two portions are arranged parallel to each other. The superimposed portion is then secured by a bolt 37 and a nut 38 that pass through in the transverse direction.

[0081] (Example 2) In the embodiment 2 shown in Figure 13(B), the lower end of the grip portion 17 is superimposed on the upper end of the support portion 16, and the axes of the two are arranged parallel to each other. A metal plate 39 is then attached to the superimposed portion and fixed in place by welding or the like.

[0082] (Example 3) In the embodiment 3 shown in Figure 13(C), the lower end of the grip portion 17 is superimposed on the upper end of the support portion 16, and the overlapping portion is fixed by welding 40 with the axes of both portions parallel to each other.

[0083] (Example 4) In the embodiment 4 shown in Figure 13(D), a joint member 41 is formed separately from the support column 16 and grip column 17 by cutting the single pipe. The upper end of the support column 16 and the lower end of the grip column 17 are separated laterally, and the joint member 41 is inserted into the space between them and fixed in place by welding or the like.

[0084] (Embodiment relating to the positioning configuration of the push bar) Figures 14 to 17 show embodiments relating to the positioning configuration of the push bar 7, with Figure 15 showing the first embodiment, Figure 16 showing the second embodiment, and Figure 17 showing the third embodiment.

[0085] As described above, the socket portion 6 for inserting the insertion portion 16a of the push bar 7 is provided with a receiving member 12 located at the bottom that closes a portion of the through hole 6a. Therefore, the insertion portion 16a of the push bar 7 is supported while resting on the through hole 6a of the socket portion 6, thereby mounting the push bar 7.

[0086] Therefore, the push bar 7 is provided with a positioning means 18 at the lower end of the insertion portion 16a, which engages with the receiving member 12, thereby positioning it in the axial direction inside the socket portion 6. As a result, when the push bar 7 is installed, the grip portion 17 is offset from the support portion 16 in the direction of arrow M, that is, towards the inside of the corner area W of the loading platform 3, and preferably offset along the angle bisector T of the corner of the loading platform 3.

[0087] As a result, the fingers of the worker gripping the grip portion 17 will not extend outward from the corner area W, as described above, allowing for safe work. Furthermore, since the push bar 7 is fixed by the positioning means 18 to prevent rotation in the axial direction, the grip portion 17 can be pushed in a stable position, allowing the transport cart to move.

[0088] (First embodiment relating to the positioning configuration of the push bar) In the first embodiment shown in Figure 15, the receiving member 12 is formed by a bolt 42 that crosses the through hole 6a. Therefore, the positioning means 18 is composed of a locking means 43 consisting of a notch 43a that locks the bolt 42 and the lower end of the insertion portion 16a of the push rod 7 in opposition to the direction of the axial direction of the insertion portion 16a.

[0089] Such positioning means 18 are provided on all push bars 7 that are inserted into socket portions 6 at each corner of the loading platform 3 of the transport cart. Therefore, as shown in Figure 4, on all four push bars 7, the grip portion 17 is offset from the support portion 16 toward the interior of the corner area W of the loading platform 3, as indicated by the arrow M.

[0090] (Second embodiment relating to the positioning configuration of the push bar) In the second embodiment shown in Figure 16, the receiving member 12 is formed by a cap member 44 that closes the through hole 6a from below, and has an uneven rib 44a on its upper surface. The positioning means 18 is composed of a locking means 43 consisting of a toothed portion 43b that locks against each other in the direction of the axial rotation of the insertion portion 16a of the push rod 7, between the uneven rib 44a and the lower end of the insertion portion 16a of the push rod 7.

[0091] As described above, the same configuration is implemented in all the push bars 7 that are inserted into the sockets 6 at each corner of the loading platform 3 of the transport trolley.

[0092] (Third embodiment relating to the positioning configuration of the push bar) In the third embodiment shown in Figure 17, the positioning means 18 does not utilize the receiving material 12 of the socket portion 6. The positioning means 18 is configured to prevent rotation of the insertion portion 16a of the push rod 7 by locking the vicinity of the insertion portion 16a of the push rod 7 to the socket portion 6.

[0093] The push bar 7 is provided with a hook mechanism 45 located near the insertion portion 16a and extending downward from its outer circumference.

[0094] When the insertion portion 16a is inserted into the through hole 6a of the socket portion 66, the hook means 45 engages with the edge of the socket portion 6, preventing the insertion portion 16a from rotating. As a result, the grip portion 17 of the push bar 7 is displaced from the support portion 16 toward the interior of the corner area W of the loading platform 3.

[0095] When the push bar 7 moves upward, the hooking mechanism 45 detaches from the edge of the socket portion 6, and the insertion portion 16a is pulled out of the socket portion 6. [Explanation of Symbols]

[0096] Single-digit side frame 2. Wife's side frame 3. Cargo bed 4. Caster device 5. Load receiving surface 6 Socket part 6a Through hole 7 Push bar 8 Corner fittings 9 digit side fixed part 10 Gable side fixation part 11 Guard member 12 Retaining material 13 Protective components 14. Grip section 15 Flange section 16 Post section 16a Insertion part 16b Middle part 17. Grip section 18 Positioning means 19A Joint Member 20 base 21, 22 Connecting pipes 23. Anti-rotation fixing means 19B Joint Member 24, 25 pipe section 26 Square tube part 27 volts 28 nuts 19C Joint Member 29, 30 Pipe fittings 31 Core material pipe 32 Fixtures 33 Grip Components 34. Displacement component 35 Downward-facing shaft section 36 Fixtures 37 volts 38 nuts 39 Metal plate 40 Welding 41 Joint member 42 bolts (retaining material) 43 Locking means 43a Notch 43b Tooth profile 44 Cap material 44a Uneven rib 45 Hooking means

Claims

1. A transport cart equipped with a rectangularly framed loading platform (3), which is moved by pushing a push bar (7) attached in an inserted state into upper open socket portions (6) located at each corner of the loading platform, The push bar (7) comprises a support column (16) that rises upward from an insertion portion (16a) inserted into the socket portion (6), and a grip portion (17) that extends from the upper end of the support column (16). The insertion portion (16a) of the support column (16) is fixed by a positioning means (18) so as not to rotate around the axis relative to the socket portion (6), The grip portion (17) is positioned offset from the support portion (16) toward the interior of the corner region (W) between the two side edges (X)(Y) of the corner portion. A push bar for a transport trolley, characterized in that it is configured so that the fingers of the worker gripping the grip portion (17) do not extend outside the corner region (W).

2. The push bar in the transport trolley according to claim 1, characterized in that the grip portion (17) which is offset from the support portion (16) is positioned near the angle bisector (T) of the corner of the loading platform (3).

3. The hand bar in the transport trolley according to claim 1, characterized in that the grip portion (17) is provided with an identification means that can be identified from the support column portion (16) with the naked eye.

4. The hand bar in a transport trolley according to claim 1, characterized in that the positioning means (18) is composed of a receiving member (12) provided at the bottom of the socket portion (6) and a locking means (43) that locks the lower end of the insertion portion (16a) of the hand bar in opposition to each other in the direction of the axial direction of the insertion portion.

5. The hand bar in a transport trolley according to claim 1, characterized in that the positioning means (18) is provided on the outer circumference near the insertion portion (16a) of the hand bar and consists of a hook means (45) that prevents the insertion portion from rotating by engaging with the socket portion (6) when the insertion portion is inserted into the socket portion.

6. A push bar for a transport trolley according to claim 1, 2, 3, 4, or 5, characterized in that a grip portion (17) is integrally extended from the support portion (16) by bending a single metal pipe.

7. Two metal pipes are used to form the support column (16) and the grip portion (17), respectively. The push bar for a transport trolley according to claim 1, 2, 3, 4, or 5, characterized in that the lower end of the grip portion (17) is superimposed on the upper end of the support portion (16) in a parallel manner and fixed to each other.

8. The support column (16) and the grip portion (17) are connected by a joint member (19), The push bar for a transport trolley according to claim 1, 2, 3, 4, or 5, characterized in that the joint member (19) has the upper end of the support column (16) fixed to one end in the lateral direction and the lower end of the grip portion (17) fixed to the other end.

9. The support column (16) is formed from a metal pipe material, and a grip component (33) having a grip portion (17) is connected to the upper end of the support column (16). The push bar in a transport trolley according to claim 1, 2, 3, 4, or 5, characterized in that the grip component (33) is formed by fixing the end of an offset component (34) extending from the grip portion (17) to the upper end of the support column (16).

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