Platform space expansion device for trolleys

Abstract

To provide a loading-platform space extension device for a dolly that is able to extend a loading-platform space by its being mounted (post-mounted) on a loading platform portion of the dolly.SOLUTION: A loading space extension device for a dolly is mounted on a dolly A having a through-hole 1 in a loading platform portion 3. A device main body 4 is configured to be switchable between an extended state D in use and a folded state F. The device main body 4 in the extended state D in use is configured to have a shape extending from a loading space of the loading platform portion 3. The device main body 4 is provided with a mounting projection 8 to be fitted into the through-hole 1 of the loading platform portion 3 at a lower part. The device main body 4 in the extended state D in use is positioned and placed on the loading platform portion 3 by fitting the mounting projection 8 into the through-hole 1.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a platform space expanding device for a carriage, which can expand the cargo carrying space simply by attaching it to the platform when the cargo carrying space on the platform of the carriage is insufficient. [Background technology]

[0002] 2. Description of the Related Art A push cart consisting of a loading platform on which cargo can be loaded, wheels (casters) attached vertically to the bottom of the loading platform, and a handle for pushing attached vertically to the top of the loading platform is popular.

[0003] In addition, in order to further enhance the convenience of this type of cart, the applicant has proposed Patent Document 1 below, in which the loading space can be expanded by horizontally sliding the loading platform outward in the left and right and forward and backward directions as needed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-51514 Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned Patent Document 1 is highly convenient because the loading space can be expanded by sliding the loading platform horizontally left and right and front and rear as needed, but because the loading platform itself has a sliding mechanism that allows part of the loading platform to slide forward, backward, left and right, the structure becomes complicated and expensive, and if you want to expand the loading space of the loading platform, you have to purchase an additional trolley with this loading space expansion function, even if you already own a trolley.

[0006] Unlike the device in Patent Document 1, which has a loading space expansion function built into the loading platform itself, the present invention provides a loading platform space expansion device for a trolley that can be easily retrofitted to the loading platform of an existing trolley if the owner already owns a trolley, thereby expanding the cargo loading space of the loading platform. [Means for solving the problem]

[0007] The gist of the present invention will be explained with reference to the accompanying drawings.

[0008] A platform space expansion device for a truck (A) is detachably mounted on an upper surface of a platform (3) with wheels (2) having at least through holes (1) at the front and rear positions of the platform (3), The plate-shaped device body 4 placed on the loading platform 3 has one half 5 and the other half 6 connected via a hinge 7, and is configured to be switchable between an unfolded state D for use in which the one half 5 and the other half 6 are aligned flush, and a folded state F in which the one half 5 and the other half 6 are folded in half by the hinge 7 so that they overlap, The device body 4 in the deployed state D during use is configured in a shape that expands the cargo loading space to be larger than the upper surface portion of the loading platform 3, which serves as the cargo loading space, The device main body 4 is provided with an attachment protrusion 8 at the bottom of the one half body 5, which is fitted into the front through-hole 1, and an attachment protrusion 8 at the bottom of the other half body 6, which is fitted into the rear through-hole 1, so that the device main body 4 in the deployed state D during use is placed in a positioned state on the loading platform 3 by fitting both of the attachment protrusions 8 into both of the through-holes 1, When the device main body 4 in the folded state F is placed on the loading platform 3 with the other half 6 facing downwards and the mounting protrusion 8 of the other half 6 is inserted into the rear through-hole 1, the device main body 4 in the folded state F is positioned on the loading platform 3, and when the one half 5 arranged on the device main body 4 in the positioned folded state F is unfolded by the hinge 7, the mounting protrusion 8 of the one half 6 is inserted into the front through-hole 1, and the device main body 4 in the unfolded state D during use is placed in a positioned state on the loading platform 3.

[0009] Furthermore, the mounting protrusion 8 is formed in a shape that can be inserted into the through hole 1 for inserting a handle provided at the front and rear positions of the loading platform portion 3 of the trolley A, and is formed in a protrusion shape that approximately matches the hole shape of the through hole 1 for inserting a handle, and is characterized in that the device main body 4 is positioned on the loading platform portion 3 by inserting the mounting protrusion 8 into the through hole 1 for inserting a handle.

[0010] The mounting protrusion 8 is provided with a locking protrusion 9 that protrudes downward from the through hole 1 of the loading platform portion 3 when the mounting protrusion 8 is inserted into the through hole 1 of the loading platform portion 3, and the locking protrusion 9 is equipped with a locking mechanism 10 that can be freely engaged and disengaged with the underside of the loading platform portion 3 when it protrudes downward from the through hole 1 of the loading platform portion 3, and when the locking protrusion 9 is engaged with the underside of the loading platform portion 3 by this locking mechanism 10, the mounting protrusion 8 is prevented from coming out of the through hole 1, and the device main body 4 is placed in a positioned state on the loading platform portion 3, as described in claim 1.

[0011] The device body 4 is also related to the platform space expansion device for a trolley described in claim 1, characterized in that a handle portion 11 that can be grasped by hand when in the folded state F is provided on the hinge portion 7, the one side half 5 or the other side half 6. [Effects of the Invention]

[0012] Since the present invention is configured as described above, the device main body can be easily positioned and placed (retrofitted) on the upper surface of the loading platform of an existing cart having a through-hole in the loading platform by simply inserting the lower mounting protrusion into the through-hole with the device main body in the deployed state when in use, and thus a large amount of cargo can be loaded onto the device main body (in the deployed state when in use) which has an expanded cargo loading space than the loading platform, and furthermore, the device main body can be folded into a compact state when not in use, despite having a shape which expands the loading space than the loading platform. The operation of placing the device body in this folded state on the loading platform can also be performed by placing the device body in its folded state on the loading platform with one half side down and inserting the mounting protrusion of this one half into the front through-hole, thereby positioning the device body in its folded state on the loading platform, and then by unfolding the other half placed on top of the positioned folded device body, the mounting protrusion of this other half can be easily inserted into the rear through-hole, allowing it to be easily positioned and placed, making this a highly practical loading platform space expansion device for a trolley.

[0013] Furthermore, the invention described in claim 2 provides an extremely practical platform space expansion device for a trolley that can be easily retrofitted to an existing trolley that has through holes for inserting handles at the front and rear of the platform.

[0014] In addition, the invention described in claim 3 makes it possible to prevent the mounting protrusion from coming loose from the through hole in the loading platform, thereby making it possible to stably place the device body on the loading platform, resulting in an even more practical loading platform space expansion device for a trolley.

[0015] Furthermore, in the invention described in claim 4, the device body in the folded state can be easily carried by the user by gripping the handle portion with his / her hand, making it an even more practical device for expanding the space of the platform of a dolly. [Brief explanation of the drawings]

[0016] [Figure 1]FIG. 1 is a perspective view showing the present embodiment in a deployed state during use. [Figure 2] FIG. 1 is a perspective view showing a state in which the present embodiment in the deployed state for use is about to be placed on the platform of a cart. [Figure 3] FIG. 2 is a perspective view showing the state of use of the present embodiment. [Figure 4] FIG. 10 is a side view showing the state in which the folded embodiment (the other half) is placed on the platform of a dolly. [Figure 5] 5 is a side view showing the state in which one half body is unfolded from the state in FIG. 4 to place the device main body in the unfolded state for use (the state in use of this embodiment). FIG. [Figure 6] 10 is an explanatory diagram showing the state in which the handle of the folded embodiment is grasped and the guide roller is in contact with the ground (used state when carried); FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] The best mode for carrying out the present invention will now be briefly described with reference to the accompanying drawings, illustrating the operation of the present invention.

[0018] The platform space expansion device for a trolley of the present invention can be used by being removably placed (retrofitted) on a platform section 3 of a trolley A having a platform section 3 with wheels 2 in which at least through holes 1 are provided at the front and rear positions.

[0019] Specifically, the device main body 4 placed on the loading platform 3 is constructed by connecting one side half 5 and the other side half 6 via a hinge portion 7, and when the one side half 5 and the other side half 6 are aligned flush to form a plate-like unfolded state D during use, the device main body 4 is configured in a shape that expands the cargo loading space larger than the upper surface of the loading platform 3, which forms the cargo loading space.

[0020] Furthermore, the device main body 4 of the present invention, in which an attachment protrusion 8 that fits into the front through hole 1 is provided on the lower part of one side half 5 and an attachment protrusion 8 that fits into the rear through hole 1 is provided on the lower part of the other side half 6, can be positioned and placed on the loading platform 3 in the deployed state D during use by simply inserting both attachment protrusions 8 into the front and rear through holes 1, and more cargo can be loaded on the device main body 4 in this deployed state D during use, in which the cargo loading space is expanded compared to the loading platform 3.

[0021] In addition, the device main body 4 of the present invention can be switched to a folded state F in which the hinge portion 7 folds the one half 5 and the other half 6 in half, and when not in use, it can be stored or carried in the compact folded state F.

[0022] Furthermore, when the device main body 4, which has been in the folded state F for storage or the like, is placed on the loading platform 3 with the other half 6 facing downwards while still in this folded state F, and the mounting protrusion 8 of the other half 6 is inserted into the rear through-hole 1, the device main body 4 in this folded state F is positioned on the loading platform 3, and when the one half 5, which is placed on top of the device main body 4 in this positioned folded state F, is unfolded by the hinge section 7, the mounting protrusion 8 of the one half 5 is inserted into the front through-hole 1, and the device main body 4 in the unfolded state D for use is placed in a positioned state on the loading platform 3.

[0023] Therefore, the device main body 4 in the folded state F can be placed on the loading platform 3 of the dolly A and used during the above-mentioned simple series of operations. [Example]

[0024] Specific embodiments of the present invention will be described with reference to the drawings.

[0025] This embodiment relates to a platform space expansion device for a trolley that can be attached (retrofitted) to a trolley A equipped with through holes 1 at the front and rear positions of the platform section 3, and is used by being placed detachably on the upper surface of the platform section 3.

[0026] First, the trolley A used in this embodiment will be explained. The wheels 2 are attached vertically to the four lower corners of the loading platform 3, which is made of a thin plate-like body having a horizontal surface direction as shown in Figures 2 to 5, and an existing hand-pushed trolley A is used, in which a hand-pushing handle 12 having a horizontal grip at the top is attached vertically to the rear end of the loading platform 3.

[0027] The platform 3 is formed in a generally rectangular shape in a plan view, with its longitudinal direction being the front-to-rear direction (with a pair of short sides as the front and rear ends). The handle 12 for pushing is erected on the top surface of the platform 3 near one of the short sides, with the side on which the handle 12 is located being the rear end of the platform A (the rear end in the direction of travel of the platform A). Furthermore, the through-holes 1, which are elongated and have a length perpendicular to the longitudinal direction (front-to-rear direction) of the platform 3 in a plan view, are formed through the platform 3 at the front and rear (see FIG. 2 ). The through-holes 1 are holes for inserting handles so that an operator can insert both hands to grasp the platform A when carrying it. In other words, in this embodiment, an existing platform A having through-holes 1 for inserting handles at the front and rear positions of the platform 3 is used.

[0028] Next, the loading platform space expansion device for a dolly of this embodiment will be described. It comprises a plate-shaped device main body 4 that can be placed on the loading platform 3, and this device main body 4 is rectangular in plan view with a length in the front-to-rear direction that is the same as the loading platform 3, and is configured as a rectangular plate-like body with a front-to-rear width greater than the front-to-rear width of the loading platform 3 and a left-to-right width greater than the left-to-right width of the loading platform 3. In other words, this device main body 4 is configured in a shape that has a cargo loading space on its upper surface that is expanded larger than the upper surface portion that serves as the cargo loading space of the loading platform 3 (see Figures 3 and 5).

[0029] To explain more specifically below, the device main body 4 is formed into a rectangular plate-like body in plan view that has a length in the front-to-back direction by connecting the long sides of one half 5 and the other half 6, which are rectangular plate-like bodies that have a length in the left-to-right direction when viewed from above, via hinge portions 7.

[0030] In addition, this device main body 4 is configured to be switchable between an unfolded state D (a state in which the one half body 5 and the other half body 6 are aligned flush in a plan view and have a rectangular shape with a length in the front-to-back direction) when in use as shown in Figures 1, 2, 3, and 5, and a folded state F as shown in Figures 4 and 6 in which the one half body 5 and the other half body 6 are folded in half so that they overlap each other via the hinge portion 7, and is configured so that it can be stored or carried in the compact folded state F when not in use.

[0031] Furthermore, the one side half 5 is configured as a frame-like body in which one long support bar 19, which is long in the left-right direction, and two short support bars 20, which are long in the front-to-rear direction, are assembled in a crosswise manner within an outer frame 18, which is made of, for example, elongated metal frame material assembled in a rectangular shape having a length in the left-to-right direction.At least the front and rear longitudinal frame portions 18A of this outer frame 18, the long support bar 19, and the short support bars 20 are formed from plate-like frame material whose upper surfaces are flat and are arranged flush with each other, and these flat upper surfaces are configured to function as upper surfaces for loading cargo (so that the upper part of the one side half 5 becomes a cargo loading space) (see Figures 1 to 3).

[0032] The other half 6 is constructed as a frame-like body, which can be said to be the one half 5 from which the long support bars 19 have been removed, and is configured so that the front and rear longitudinal frame portions 18A of the outer frame 18, which are arranged flush with the surface, and the flat upper surface portions of the short support bars 20 function as a cargo loading upper surface (so that the upper part of the other half 6 becomes a cargo loading space) (see Figures 1 to 3).

[0033] Furthermore, the term "plate-shaped device body" in claim 1 is not used to refer only to a body with a long, continuous flat surface (one with a similar configuration to the loading platform 3 of the trolley A), but is used to include a device body 4 that is thin, flat, and capable of carrying cargo, such as the device body 4 in this embodiment, which is composed of a frame-shaped body with no continuous flat surface.

[0034] In addition, the one-side half 5 and the other-side half 6 are formed so that one end of the left and right short-side frame portions 18B of the outer frame 18 extends and protrudes outward, and these left and right extensions are configured as pivotal extension portions 13 that are pivotally attached to the hinge portion 7 in a freely rotatable manner.

[0035] A parallel two-shaft hinge structure is employed for the hinge portion 7. Specifically, the hinge portion 7 is configured by connecting a pair of left and right shaft bases 14 to both ends of a connecting bar 11 having the same length as the long support bar 19, and the shaft bases 14 are provided with pivot shafts 15 at two locations, one at the front and one at the back, whose axial directions are parallel to each other and coincide with the longitudinal direction of the connecting bar 11. The left and right pivot extensions 13 of the one-side half 5 are pivotally attached to the pivot shaft 15 on one (the front) of the left and right shaft bases 14, and the left and right pivot extensions 13 of the other-side half 6 are pivotally attached to the pivot shaft 15 on the other (the rear) of the left and right shaft bases 14 (see FIGS. 1 to 3). The device is configured so that it can be folded in half so that the one half 5 and the other half 6 overlap to a nearly parallel state via the hinge portion 7 of this parallel biaxial hinge structure (see Figs. 4 and 6). Note that the phrase "folded in half so that the one half 5 and the other half 6 overlap" in claim 1 does not only refer to a state in which the one half 5 and the other half 6 are folded so that they completely overlap each other, but also includes a state in which the one half 5 and the other half 6 are folded with some distance between them (for example, the state in Fig. 4).

[0036] Furthermore, this hinge portion 7 can rotate one side half 5 upward relative to the other side half 6 from the horizontal state of the device main body 4 in the deployed state D during use to the folded state F, or can rotate the other side half 6 upward relative to the one side half 5 to the folded state F, but is equipped with a rotation restriction mechanism (not shown) that restricts the rotation range so that neither the one side half 5 nor the other side half 6 can rotate downward from this horizontal state.

[0037] Furthermore, the connecting bar 11 of the hinge portion 7 is configured to also function as a handle portion 11 that can be grasped by hand and carried when the device main body 4 is in the folded state F (see FIG. 6). That is, in this embodiment, the handle portion 11 is provided on the hinge portion 7, but the handle portion 11 may be provided on either the one side half 5 or the other side half 6.

[0038] Here, to further explain the one side half 5, this one side half 5 is configured to be set with the front side of the device main body 4 (this one side half 5 is configured to be placed on the front side of the loading platform 3), and at the left and right corners of the front side of this one side half 5 (opposite the left and right pivot extensions 13), guide rollers 17 are provided protruding forward from the left and right corners to ensure smooth running when the dolly A hits an obstacle such as a wall while traveling and to cushion the impact of the collision. In addition, when carrying the device main body 4 in the folded state F, these guide rollers 12 are configured to function as travel rollers when the handle 11 is grasped with a hand and the guide roller 12 is brought into contact with the ground (see Figure 6).

[0039] In addition, in this embodiment, the device main body 4 is provided with an attachment protrusion 8 at the bottom of one side half 5 that is inserted into the through hole 1 on the front side of the loading platform section 3, and an attachment protrusion 8 at the bottom of the other side half 6 that is inserted into the through hole 1 on the rear side of the loading platform section 3, so that the device main body 4 in the deployed state D during use is positioned and placed horizontally on the loading platform section 3 by inserting both attachment protrusions 8 into the front and rear through holes 1 (see Figures 3 and 5).

[0040] Specifically, a plate material bent into a downwardly convex shape is attached to the lower part of the rear long side frame portion 18A of the outer frame 18 of the one side half 5 at the midpoint in the longitudinal direction, and the downwardly convex portion of this plate material is configured as the mounting convex portion 8 of the one side half 5 (see Figure 2).

[0041] In addition, a plate material bent into a downwardly convex shape is attached to the lower part of the other half body 6 at a midpoint near the rear of the two short support bars 20, and the downwardly convex portion of this plate material is configured as the mounting convex portion 8 of the other half body 6 (see Figure 2).

[0042] The positions of the attachment protrusions 8 of the one half body 5 (front side) and the attachment protrusions 8 of the other half body 6 (rear side) are arranged to correspond to the positions of the through holes 1 for inserting the handles at the front and rear of the loading platform 3 when the rear end of the device main body 4 (other half body 6) is placed on the loading platform 3 in the unfolded state D during use with the hand-pushing handle 12 (handle support part 21 to which the hand-pushing handle 12 is attached so as to be foldable and rotatable) in a state where the rear end of the device main body 4 (other half body 6) is placed on the loading platform 3 in the unfolded state D during use with the hand-pushing handle 12 in close proximity to or in contact with the hand-pushing handle support part 21, and the front and rear attachment protrusions 8 are arranged to correspond to the positions of the through holes 1 for inserting the handles at the front and rear of the loading platform 3. When the device main body 4 is inserted into the platform 3, the device main body 4 in the deployed state D during use is positioned and placed on the platform 3 with its rear end close to or in contact with the push handle 12 (handle support portion 21), and in this positioned and placed state, the front end of the device main body 4 protrudes forward from the front end of the platform 3, and the left and right ends protrude outward to the left and right from the left and right ends of the platform 3, so that the device main body 4 effectively expands (enlarges) the cargo loading space of the trolley A (see Figures 3 and 5).

[0043] Furthermore, the device main body 4 of this embodiment is configured so that it can be positioned simply by inserting each mounting protrusion 8 into the through holes 1 for inserting handles at the front and rear of the loading platform portion 3, but positional displacement prevention buffer portions 16 are provided at the bottom of the left and right short sides of the outer frames of the one side half 5 and the other side half 6, close to or abutting the left and right side edges of the loading platform portion 3, to prevent the device main body 4 from shifting left and right relative to the loading platform portion 3 (see Figure 2).

[0044] Furthermore, each of these mounting protrusions 8 is formed in a long convex shape (rectangular when viewed from the bottom) that roughly matches the hole shape of the elongated through-hole 1, and when this mounting protrusion 8 is inserted into the through-hole 1, the device main body 4 is positioned in a state where there is almost no positional deviation in the front-to-back or left-to-right directions relative to the loading platform portion 3, and the device main body 4 is positioned in a state where it is prevented from rotating horizontally, with the mounting protrusion 8 as a fulcrum.

[0045] Therefore, simply by placing the device main body 4 in the folded state F on the loading platform 3 with the other half body 6 facing downwards as shown in Figure 4 and inserting the mounting protrusion 8 of the other half body 6 into the rear through-hole 1 (even if the device main body 4 is placed on the loading platform 3 in the folded state F without being unfolded), the device main body 4 in the folded state F will be positioned on the loading platform 3, and then when the one half body 5 arranged on top of the device main body 4 in the positioned folded state F is rotated by the hinge part 7 and unfolded until it is horizontal (until it is flush with the one half body 5), the mounting protrusion 8 of the one half body 5 will be inserted into the front through-hole 1, and the device main body 4 in the unfolded state D for use will be placed in a positioned state on the loading platform 3 (see Figure 5).

[0046] In addition, the mounting protrusion 8 in this embodiment is provided with a locking protrusion 9 that protrudes downward from the through hole 1 of the loading platform portion 3 when the mounting protrusion 8 is inserted into the through hole 1 of the loading platform portion 3, and the locking protrusion 9 is equipped with a locking mechanism 10 that can be freely engaged and disengaged with the underside of the loading platform portion 3 when it protrudes downward from the through hole 1.When the locking protrusion 9 is engaged with the underside of the loading platform portion 3 by this locking mechanism 10, the mounting protrusion 8 is prevented from coming out of the through hole 1, and the device main body 4 is placed in a positioned state on the loading platform portion 3.

[0047] Specifically, in this embodiment, the locking protrusion 9 is provided on the mounting protrusion 8 of the one half body 5, and this locking protrusion 9 is equipped with the locking mechanism 10. Note that the locking protrusion 9 may be provided on the mounting protrusions 8 of both the one half body 5 and the other half body 6.

[0048] In addition, this locking protrusion 9 is made of a plate material bent into a U-shape as shown in Figure 2, and the middle plate portion of this U-shaped locking protrusion 9 is formed to have approximately the same shape (rectangular) as the lower end surface of the mounting protrusion 8, and this middle plate portion of the locking protrusion 9 is attached to the lower end surface of the mounting protrusion 8 so that it is overlapped with the lower end surface of the mounting protrusion 8 (with both end plate portions facing downward).

[0049] In addition, the locking mechanism 10 is provided such that an intermediate plate portion of the locking protrusion 9 is pivotally attached to the lower end surface of the mounting protrusion 8 so as to be horizontally rotatable, and the locking protrusion 9 is provided so that a user can grasp both end plate portions thereof and rotate it horizontally relative to the mounting protrusion 8, and when the locking protrusion 9 is rotated so that its length direction is aligned with the length direction of the mounting protrusion 8 (to the state shown in FIG. 2), the mounting protrusion 8 can be inserted and removed together with the locking protrusion 9 into the through hole 1 for inserting a handle, and the locking mechanism 10 is provided such that an intermediate plate portion of the locking protrusion 9 is pivotally attached to the lower end surface of the mounting protrusion 8 so as to be horizontally rotatable relative to the mounting protrusion 8, and when the locking protrusion 9 is rotated so that its length direction is aligned with the length direction of the mounting protrusion 8 (to the state shown in FIG. 2), the mounting protrusion 8 can be inserted and removed together with the locking protrusion 9 into the through hole 1 for inserting a handle, and the locking mechanism 10 is provided such that the ... locking protrusion 9 is pivotally attached to the lower end surface of the mounting protrusion 8. After the protrusion 9 and the mounting protrusion 8 are inserted into the through hole 1, when the locking protrusion 9 protruding downward from the through hole 1 is rotated horizontally by 90 degrees so that the length direction of the locking protrusion 9 and the length direction of the mounting protrusion 8 are perpendicular to each other (as shown in Figures 1, 3, and 5), the upper surface of the intermediate plate portion of the locking protrusion 9 approaches or abuts against the underside of the loading platform 3 around the handle insertion through hole 1, preventing the mounting protrusion 8 from slipping out upward.

[0050] The present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate. [Explanation of symbols]

[0051] 1 through hole 2 wheels 3 Cargo area 4. Device body 5 One side half 6 Other half 7 Hinge part 8 Mounting protrusion 9 Locking protrusion 10 Locking mechanism 11 Handle A cart D Deployed state when in use F Folded state

Claims

1. A platform space expansion device for a truck is detachably mounted on an upper surface of a platform portion of a truck having a wheeled platform portion with at least through holes provided at front and rear positions, The plate-shaped device body placed on the loading platform has one half and the other half connected via a hinge, and is configured to be switchable between an unfolded state in use in which the one half and the other half are aligned flush, and a folded state in which the one half and the other half are folded in half by the hinge so that they overlap, The device body in the deployed state during use is configured in a shape that expands the cargo loading space to be larger than the upper surface portion of the loading platform portion, which serves as the cargo loading space; The device main body is provided with an attachment protrusion at the bottom of one half that fits into the front through-hole, and an attachment protrusion at the bottom of the other half that fits into the rear through-hole, and the device main body in the deployed state during use is configured to be positioned and placed on the loading platform by fitting both attachment protrusions into both through-holes, When the device main body in the folded state is placed on the loading platform with the other half facing downwards and the mounting protrusion of the other half is inserted into the rear through hole, the device main body in the folded state is positioned on the loading platform, and when the one half placed on top of the positioned folded device main body is unfolded by the hinge, the mounting protrusion of the one half is inserted into the front through hole, and the device main body in the unfolded state for use is placed in a positioned state on the loading platform.

2. The mounting protrusion is formed in a shape that can be inserted into the through hole for inserting a handle provided at the front and rear positions of the loading platform of the trolley, and is formed in a protrusion shape that approximately matches the hole shape of the through hole for inserting a handle, so that the device main body can be positioned on the loading platform by inserting the mounting protrusion into the through hole for inserting a handle.

3. The mounting protrusion is provided with a locking protrusion that protrudes downward from the through hole of the loading platform when the mounting protrusion is inserted into the through hole of the loading platform, and the locking protrusion is equipped with a locking mechanism that can be freely engaged and disengaged with the underside of the loading platform when it protrudes downward from the through hole, and when the locking protrusion is engaged with the underside of the loading platform by this locking mechanism, the mounting protrusion is prevented from coming out of the through hole, and the device main body is positioned and placed on the loading platform.

4. 2. The platform space expansion device for a trolley according to claim 1, wherein the device main body has a handle portion on the hinge portion, the one side half, or the other side half that can be grasped by hand when in the folded state.

Images