JP5494962B2 - Folding cart - Google Patents

Description

  The present invention relates to a foldable cart having a vertical panel along three sides, which can be folded in a planar shape into an L shape.

  This kind of foldable cart is, for example, as described in Patent Document 1, a back panel that rises from the rear side of a rectangular cargo bed portion and includes wheel units on the lower sides of both left and right sides, Both left and right side panels with wheel units provided on the lower side of the front end and rising from the left and right side sides are connected to the lower side of the back panel so as to be raised and lowered, and at least one side of the left and right side panels A panel is connected to the back panel so as to be swingable horizontally, and the loading platform is engaged with the front end portions of the left and right panels when the loading platform is in a horizontal lying posture, so that the loading platform is raised. Locking means for preventing rotation to the posture and swinging of the one side panel to the outside is provided.

Thus, in such a foldable carriage, the locking means is made of a metal projecting upward from a mounting seat of a wheel unit fixed to the lower side of the side panel or the lower front end of the side panel. Engagement piece, a through hole provided on the loading platform portion so that the engagement piece fits upward from below, and provided on the loading platform portion side so as to be detachable from the engagement piece. It is composed of an operating rod, and the rotation of the loading platform from the horizontal lying posture to the standing posture is prevented by the engagement of the operating rod and the engaging piece of the locking means, and the side panel swings outward. Is configured to be prevented by a horizontal contact between the through hole on the loading platform side and the engagement piece on the side panel side .

JP 2008-62725 A

  In the foldable cart as described above, it is common that the loading platform is molded from a synthetic resin in order to reduce the weight of the entire cart. Moreover, since the through hole on the loading platform portion side that constitutes the locking means must be provided close to the left and right sides of the loading platform portion, a metal engagement piece on the side panel side is fitted into this through hole. When a large external force acts on the side panel in the direction of opening the side panel to the outside when the loading platform is locked, for example, an operator mistakenly forgets to bridge the connecting rod that connects the left and right side panels. When the side panel is operated to be opened strongly, or when an external force that repeatedly opens the side panel due to repeated travel on a stepped road surface is repeatedly applied, the external force is applied to each other. Among the engaging pieces and through holes received by contact, an accident occurred in which the outer side receiving the engaging pieces of the through holes of the synthetic resin loading platform was damaged and lost.

The present invention proposes a foldable cart that can solve the above-mentioned conventional problems, and the foldable cart according to the present invention according to claim 1 is an embodiment described later. In order to make it easier to understand the relationship, the reference numerals used in the description of the embodiment are attached with parentheses, and are raised from the rear side of the rectangular loading platform (1) and below the left and right ends. A back panel (2) provided with a wheel unit (5, 6), and left and right side panels (3, 8) provided with a wheel unit (7, 8) on the lower side of the front end and rising from the left and right sides of the loading platform (1). 4), and the loading platform (1) is connected to the lower side of the back panel (2) so that it can be raised and lowered, and at least one side panel (4) of the left and right side panels (3,4) It is connected to the back panel (2) so as to be swingable horizontally, and the loading platform (1) is connected to the loading platform (1) when it is in a horizontal lying position. A lock that engages with the front end of the right side panels (3, 4) to prevent the load platform (1) from rotating to the upright position and swinging the one side panel (4) outward. means (11) is a freely carriage folding provided, swings to the outside of the locking means (11) said one side panel during engaging action against the left and right side panels (3,4) of (4) Apart from the vertical abutment surface (S1) on the one side panel (4) side and the vertical abutment surface (S2) on the cargo bed part (1) side, the two abutment surfaces The second vertical abutment surface (S3) on the side of the loading platform (1), which abuts each other simultaneously with the abutment of the surfaces (S1, S2) and prevents the one side panel (4) from swinging outward. ) And the second vertical abutment surface (S4) on the one side panel (4) side, in a foldable carriage,
The second vertical abutment surface (S3) on the loading platform (1) side is constituted by a side surface of a projection (26) projecting downward from the bottom surface of the loading platform (1), and the one side panel ( The projection (26) of the mounting seat (14) of the wheel unit (8) attached to the lower side of the front end of the one side panel (4) is fitted into the second vertical abutment surface (S4) on the 4) side. Consists of the inner surface of the through-hole (27) provided at the mating position,
The mounting seat (14) of the wheel unit (8) comprises a rectangular plate that is welded and fixed to the lower side of the one side panel (4) and protrudes inward from the lower side, and the rectangular plate On the part projecting inward from the lower side of one side panel (4), the rising side sides (19a, 19b) bent upward from both front and rear sides and the rising side sides (19a, 19b) A lower open gate-shaped ridge (20) formed by bending the rectangular plate at a central position between, the second vertical contact surface (S4) on the one side panel (4) side The through-hole (27) that constitutes the structure is formed in the ceiling plate part (20a) of the gate-shaped protrusion (20) .

When carrying out the present invention, in particular good urchin according to claim 2, wherein the mounting seat of the wheel unit (8) (14) is upwardly bent been rising from opposite sides of front and rear side edges of the rectangular plate A lower open front half portal ridge (20) formed by bending the rectangular plate at a central position between the side (19a, 19b) and the rising both sides (19a, 19b), and the first half gate A structure having a rear half side wall portion (21a, 21b) obtained by cutting a ceiling plate portion (20a) of the shaped ridge portion (20), and a rear half portion of the rising both sides (19a, 19b) and the latter half both sides walls (21a, 21b) and out can be welded and fixed to the lower edge of said one side panel (4).

In addition, as described in claim 3 , the second vertical abutment surface (S3) on the loading platform (1) side is a recessed portion that is formed on the loading platform (1) and is open at least on the lower side. The vertical wall part (29) long in the front-rear direction between (28) can be formed on one side of the protrusion (26) long in the front-rear direction formed by extending and projecting downward.

  According to the configuration of the first aspect of the present invention, when an external force is applied in a direction in which the side panel is expanded outward in the engaged state of the lock means with respect to the left and right side panels, the external force is applied to the lock means. Disperse the contact between the contact points of the set of vertical contact surfaces and the contact point of the second vertical contact surfaces provided separately from the set of vertical contact surfaces of the locking means. Compared with the configuration in which the external force is received only at the contact portion between the pair of vertical contact surfaces in the lock means, the portion constituting the set of vertical contact surfaces in the lock means, particularly It is possible to reduce the risk of breakage of the portion forming the vertical contact surface on the side of the base made of synthetic resin by half and increase the durability. In addition, in order to obtain the same effect, the thickness is increased for the portion constituting the set of vertical contact surfaces in the locking means, particularly the portion forming the vertical contact surface on the synthetic resin carrier side. Compared with the case where reinforcing measures such as embedding, embedding a reinforcing member, fixing a reinforcing plate, etc. are taken, at any place not directly related to the locking means, the second part is placed on the loading platform side and the side panel side. Since it is only necessary to form a vertical abutment surface, not only is it easy to implement, but the intended purpose can be achieved without being affected by any change in the dimensional conditions of the part related to the locking means. .

  In addition, various embodiment can be considered for the 2nd perpendicular contact surface provided in the loading platform part side and the side panel side. For example, apart from the through hole on the loading platform side provided as the locking means and the engagement piece on the side panel side, the same second through hole and second engagement piece are provided on the loading platform side and the side panel side. A second through-hole provided separately and a side surface of the second engagement piece fitted into the second through-hole are brought into contact with each other to prevent the side panel from swinging outward. Two vertical contact surfaces can be used. In addition, when an operating rod that can be freely engaged and disengaged is used in combination with an engaging piece provided on the side panel as known in the art, the operating rod is engaged with the engaging piece on the side panel. It becomes a means to prevent the loading platform from rotating to the upright posture, but flanges are connected to both ends of the operation rod, and the flanges are in contact with each other when the side panel opens outward. The side surface and the outer surface of the engagement piece may be the second vertical contact surface.

However, according to the configuration of the present invention, it can be inexpensively implemented for with a very simple structure of the present invention, further, making it possible to minimize the strength reduction of the mounting seat of the wheel units through hole is provided If the projection on the loading platform portion side is configured to fit into the portal ridge portion through the through hole provided in the ceiling plate portion of the portal ridge portion of the mounting seat, the projection fits into the through hole. The effect of making the combined depth sufficiently deeper than the plate thickness of the mounting seat on which the through hole is formed, and blocking the side panel that is about to open outward by the contact between the inner side surface of the through hole and the side surface of the protrusion Can be surely performed.

Moreover, according to the structure of Claim 3 , the vertical wall part between the recessed parts formed in order for weight reduction and material saving of the metal mold | die used when a loading part part is shape | molded with a synthetic resin. It is possible to easily and easily form the ridge portion that forms the second vertical contact surface required on the loading platform portion side by only partially increasing the depth of the groove portion for molding the.

Fig. A is a left side view of the entire carriage, Fig. B is a front view thereof, and Fig. C is a right side view thereof. It is a top view of the whole trolley | bogie. It is a top view of the state which folded the trolley | bogie into the planar shape L shape. It is a top view which shows the principal part of a loading platform part. It is a front view same as the above. It is a cross-sectional top view which shows the principal part of a side panel. It is the side view which looked at the principal part same as the above from the inside. It is a vertical front view of the principal part same as the above. It is a perspective view which shows a wheel unit and an engagement piece. It is a partially notched top view of the principal part when a locking means exists in an action state. It is a partially cutaway front view of the principal part same as the above. It is a partial vertical side view of the principal part same as the above. FIG. 6 is a partially cutaway plan view of the main part showing a state when the side panel is opened outward when the locking means is in an operating state. It is a partially cutaway front view of the principal part same as the above. It is a bottom view of the principal part of a loading platform part.

  1 and FIG. 2, 1 is a rectangular loading platform, 2 is a back panel that rises from the rear side of the loading platform 1, and 3 and 4 are side panels that rise from the left and right sides of the loading platform 1. The back panel 2 has wheel units 5 and 6 attached to the lower sides of both ends, and the loading platform 1 is pivotally supported on the lower side of the back panel 2 so as to be raised and lowered on the rear side. The left side panel 3 has a vertical rear side connected to the left side of the back panel 2 in a substantially perpendicular direction and a wheel unit 7 is attached to the lower side of the front end. The right side panel 4 has a vertical rear side connected to the right side of the back panel 2 so as to be swingable in the horizontal direction, and a wheel unit 8 is attached to the lower side of the front end. Further, one end of the connecting rod 9 is attached to the middle height position of the vertical front side of the left panel 3 so as to be swingable up and down, and the middle portion of the vertical front side of the right panel 4 is attached to the middle height position of the connecting rod 9. A locking metal fitting 10 whose other end can be freely attached and detached is attached, and the right and left side panels 3 and 4 can be connected by the connecting rod 9 as required.

The foldable cart having the above structure is well known in the art. In the assembled state shown in FIGS. 1 and 2, the loading platform 1 is tilted horizontally with respect to the back panel 2, and the left and right sides are the left and right side panels 3. , 4 and four wheel units 5 to 8, and lock means for preventing the right side panel 4 from opening outward from this state and preventing the loading platform 1 from rotating upward. 11 is provided. Therefore, by switching the lock means 11 to the unlocked state, as shown in FIGS. 1C and 3, the loading platform 1 is switched to the standing posture standing along the inner side of the back panel 2, and the loading platform in this standing posture is also used. The entire carriage can be folded into a plane L shape by swinging the right panel 4 horizontally approximately 90 degrees so that the part 1 is sandwiched between the back panel 2. At this time, the wheel unit 8 on the lower side of the front end of the right panel 4 enters the lower side of the loading platform 1 and the back panel 2 in the standing posture.

  As shown in FIGS. 4 and 5, the locking means 11 used in the illustrated embodiment includes the operation rod 12 and the loading platform portion 1 that are installed along the front side in the vicinity of the loading side portion 1. Engagement holes 13a and 13b that are formed in the vicinity of the front ends of the left and right sides along the left and right sides and that are long in the front-rear direction, and below the front ends of the left and right panels 3 and 4, as shown in FIGS. It is comprised from the engagement piece 15 each protrudingly provided from the mounting seat 14 of the wheel unit 7 and 8 of the side. The wheel units 5 and 6 below the both ends of the back panel 2 and the wheel units 7 and 8 below the front ends of the left and right side panels 3 and 4 are each provided with a free wheel 16 (see FIG. 1) below each mounting seat 14. Installed and configured.

  As is conventionally known, the operation rod 12 is supported in the loading platform 1 so as to be movable in the front-rear direction within a certain range, and can be swung up and down provided at the center position of the front side of the loading platform 1. When the operating body 17 is engaged with the operating body 17 and is in a horizontal position flush with the loading platform 1, the left and right ends of the operating rod 12 are in the region of the engaged holes 13a and 13b in plan view. The operating rod 12 is held at the lock-in position where it enters, and the operating body 17 is moved upward to switch the operating rod 12 to the unlocking position where the left and right ends of the operating rod 12 are disengaged forward from the region of the engaged holes 13a and 13b in plan view. It is configured to be. The operating rod 12 is biased toward the lock operating position by a spring, gravity acting on the operating body 17 or both. Further, the loading platform 1 is molded from synthetic resin, and reinforced steel pipes in the left and right direction are embedded in a plurality of positions in the front and rear direction, and the operating body 17 has a front end as shown in FIG. The reinforcing steel pipe 18 is supported so as to be swingable up and down.

  The mounting seats 14 of the wheel units 7 and 8 attached to the lower side of the front ends of the left and right side panels 3 and 4 have a left-right symmetric structure formed by pressing a single rectangular metal plate. As shown, the rising sides 19a and 19b bent upward from both front and rear sides of the rectangular metal plate, and the lower side formed by bending the rectangular plate at the center position between the rising sides 19a and 19b. The first half portal ridge portion 20 is open, and both rear half wall portions 21a and 21b are formed by cutting off the ceiling plate portion 20a of the first half portal ridge portion 20, and the second half portions of the rising both sides 19a and 19b The lower half side walls 21a and 21b are welded and fixed to the lower side of the horizontal plate portion 22a of the angle member 22 constituting the lower sides of the left and right side panels 3 and 4. And the position near the both ends of the length direction of the said groove part 23a, 23b in the groove part 23a, 23b between the standing | starting-up both sides 19a, 19b and the front half portal-shaped protrusion part 20 and the latter half side wall parts 21a, 21b In addition, nuts 24 that constitute screw holes for attaching the universal wheels 16 (see FIG. 1) are fixed by welding, and by using these nuts 24, there are four universal wheels 16 below the mounting seat 14. Installed with bolts.

  Note that the heights of the rising side edges 19a and 19b and the front half portal ridge portion 20 in the region projecting inward from the lower side edges of the left and right side panels 3 and 4 of the mounting seat 14 are the same as those of the left and right side panels 3 and 4. When the right side panel 4 is folded inward, it is lower than the height of the rising side edges 19a, 19b and the rear half side walls 21a, 21b in the region overlapping the lower side (horizontal plate 22a of the angle member 22). The mounting seat 14 of the wheel unit 8 attached to the lower side of the front end of the right side panel 4 is configured to smoothly and smoothly enter the lower side of the stand 1 and the back panel 2.

  Thus, the engaging piece 15 of the locking means 11 is vertically inserted into the vertical groove 25 formed at the boundary position between the front half portal ridge 20 and the rear half walls 21a, 21b of the mounting seat 14. The plate surface is made of a metal flat plate along the front-rear direction, which is fixed by welding in a state adjacent to the inner side of the horizontal plate portion 22a of the angle member 22 constituting the lower side of the right panel 4, and the upper end of the plate On the front side, an engaging claw portion 15a is provided so that the upper side is inclined forward and the lower side is substantially horizontal.

  In the lock means 11 configured as described above, as shown in FIGS. 10 to 12, the right side panel 4 is unfolded substantially forward at a right angle with respect to the back panel 2, and the loading platform 1 is lowered forward from the standing posture. When the left and right sides of the loading platform 1 are supported by the lower sides of the left and right panels 3 and 4 (the horizontal plate 22a of the angle member 22), the left and right panels 3 and 4 are below the front ends. The engagement pieces 15 projecting upward from the mounting seats 14 of the wheel units 7 and 8 on the side are provided in the positions near the front ends of the left and right sides of the loading platform 1 and the engaged holes 13a and 13b. Fit in. At this time, the operating rod 12 whose upper side of the engaging claw 15a of the engaging piece 15 is positioned at the forward locking position is pushed against the urging force toward the unlocking position, and the engagement Since the engaging claw portion 15a of the combined piece 15 moves upward from the operating rod 12, the operating rod 12 returns to the original forward limit locking position by the biasing force, and the engaging claw portion 15a of the engaging piece 15 is restored. Will go into the underside. In this state, when the loading platform portion 1 stands up, both ends of the operation rod 12 on the loading platform portion 1 side engage with the engagement claw portions 15a of the engagement pieces 15 on the left and right side panels 3 and 4 side. To be prevented. Further, when an external force is applied in the direction in which the left and right side panels 3 and 4 are separated from each other, the outward vertical contact surface S1 of each engagement piece 15 on the left and right side panels 3 and 4 side and the engaged part on the loading platform 1 side The external force is received by the contact of the holes 13a and 13b with the inward vertical contact surface S2, and the opening of the right panel 4 to the outside is prevented.

  When the carriage is folded, the operating body 17 is moved upward to move the operating rod 12 against the biasing force to the unlocking position at the backward limit, and both ends of the operating rod 12 are moved to the left and right side panels 3 and 4 side. Since the engagement between the left and right sides of the loading platform 1 and the left and right panels 3 and 4 is released by retreating from the bottom of the engagement claw 15a of the engagement piece 15, the loading platform 1 is moved upward to move the back panel. 2 and the right side panel 4 may be closed inward by approximately 90 degrees so as to overlap the outside of the loading platform 1 in the standing position.

  In the foldable carriage as described above, according to the present invention, when the locking means 11 is in the locking action state, the locking means 11 side that prevents the left and right side panels 3 and 4 from opening outward to contact each other. In addition to the vertical contact surfaces S1 and S2, the second vertical contact surfaces S3 and S4 are provided to prevent the left and right side panels 3 and 4 from opening outward to contact each other. That is, on the bottom surface of the front left and right end portions of the loading platform 1, the protrusions 26 are projected downward at positions overlapping the mounting seats 14 of the wheel units 7 and 8 below the front ends of the left and right side panels 3 and 4, The mounting seats 14 of the wheel units 7 and 8 below the front ends of the left and right side panels 3 and 4 are provided with through holes 27 into which the projections 26 are fitted. As shown in FIGS. 11 is in the locked state, when an outward external force is applied to the left and right side panels 3 and 4 so that the vertical contact surfaces S1 and S2 come into contact with each other, the inward vertical contact of the projection 26 is simultaneously performed. The contact surface S3 and the outward vertical contact surface S4 of the through hole 27 are configured to contact each other.

  Specifically, the loading platform 1 is molded from a synthetic resin as described above, and in order to reduce weight and save material, as shown in FIG. 28 are arranged and molded, so that one of the vertical walls long in the front-rear direction between the adjacent recesses 28 is long in the front-rear direction in the position overlapping the mounting seat 14 of the wheel units 7, 8. The projections 26 that are long in the front-rear direction are formed by projecting the portion 29 downward. On the other hand, the through hole 27 provided in the mounting seat 14 of the wheel units 7 and 8 is configured by cutting out a rectangular shape so as to cross the ceiling plate portion 20a of the front half portal ridge portion 20 of the mounting seat 14 in the front-rear direction. doing. Accordingly, as shown in FIGS. 10 and 12, the protrusion 26 and the through hole 27 that are long in the front-rear direction are located at the center of the through hole 27 in the left-right direction, but the protrusion 26 is located in the front-rear direction. The protrusion 26 and the through hole 27 that are long in the front-rear direction are displaced in the front-rear direction. Of course, the projection 26 is molded into a columnar projection having a circular cross section or a rectangular cross section that fits in the substantially central portion of the through hole 27 regardless of the molding position of the concave portion 28, and It is also possible to configure so that it can be fitted deeply into the through hole 27 between the side wall portions.

  In addition, the bottom surface (bottom surface of the vertical wall part between each recessed part 28) 1a in the area | region which overlaps the mounting seat 14 of the wheel units 7 and 8 of the loading platform 1 is the surface of the said mounting seat 14, ie, a front half portal shape. It is molded one step lower so that it is supported by the ceiling plate portion 20a of the ridge portion 20 and the upper side of the first half of the rising side sides 19a, 19b, and the projection 26 projects from the bottom surface 1a molded one step lower. Has been. Thus, the bed portion 1 made of synthetic resin is thermally expanded and contracted by a change in the outside air temperature due to a change in season, and the engaged holes 13a and 13b are accompanied by the thermal expansion and contraction of the bed portion 1. The thickness of the engagement piece 15 is set so that the engagement between the engagement piece 15 in the lock means 11 and the engaged holes 13a and 13b on the loading platform 1 side can be performed without hindrance even if the interval between them varies. On the other hand, the engaged holes 13a and 13b are formed sufficiently wide. Accordingly, the dimensional relationship in the lateral direction between the protrusions 26 and the through holes 27 constituting the second vertical contact surfaces S3 and S4 is also set in consideration of the thermal expansion and contraction of the loading platform 1 and the heat of the loading platform 1 Even if the interval between the projections 26 varies with expansion and contraction, the projection 26 and the left and right side panels 3 and 4 on the side through-holes 27 are fitted without any trouble. Further, when an outward external force is applied to the left and right side panels 3 and 4 so that the vertical contact surfaces S1 and S2 come into contact with each other, the inward vertical contact surface S3 of the projection 26 and the through hole are simultaneously used. 27 and the vertical contact surface S4 when the external force is not applied to the left and right side panels 3 and 4, and the vertical contact. The interval between the contact surfaces S3 and S4 is configured to be substantially equal.

  With the above structure, in the assembled cart, the left and right side panels 3 and 4 are left and right between the left and right side panels 3 and 4 due to mishandling by the operator in a state where the left and right side panels 3 and 4 are forgotten to be connected by the connecting rod 9. When a large external force acting in the direction of separating the side panels 3 and 4 from each other is applied, or when such an external force is repeatedly applied, the contact between the vertical contact surfaces S1 and S2 on the lock means 11 side and the vertical contact Since the external force is received by the contact between the second vertical contact surfaces S3 and S4 provided separately from the surfaces S1 and S2, only the contact between the vertical contact surfaces S1 and S2 on the lock means 11 side. Thus, as in the case where the external force is received, the possibility that the thin side wall portion 30 outside the engaged holes 13a and 13b on the loading platform portion 1 side is damaged or lost is eliminated or reduced.

  In addition, when the unfolded left panel 3 is firmly fixed to the back panel 2 with a sufficient 90 ° included angle, the engaging piece 15 of the left panel 3 is theoretically There is no fear that the left side of the loading platform 1 will be in contact with the engaged hole 13a. Therefore, in such a case, the projection 26 and the through hole 27 constituting the second vertical contact surfaces S3 and S4 are provided on the right side panel 4 to be folded and the right side portion of the loading platform 1. It ’s fine. In practice, however, the left-side panel 3 that is not folded can also be swung to the left and right by some play in the connecting portion with the back panel 2, so that it is desirable to configure as in the above embodiment. Of course, the right side panel 4 to be folded may be configured such that the swing angle to the outside is limited within a certain range with respect to the forward direction of 90 degrees with respect to the back panel 2.

  The foldable cart of the present invention can be utilized as a practical transport cart having sufficient durability even though the cargo bed portion is made of a synthetic resin that is easily damaged by impact.

DESCRIPTION OF SYMBOLS 1 Loading platform part 2 Back panel 3, 4 Both right-and-left side panels 5-8 Wheel unit 9 Connecting rod 10 Locking metal 11 Locking means 12 Operation rod 13a, 13b Engagement hole 14 Wheel unit mounting seat 15 Engagement piece 15a Engagement Claw part 16 Swivel wheel 17 Operating body 18 Reinforced steel pipes 19a and 19b Both sides of rising of mounting seat 20 Front half portal ridge part of mounting seat 20a Ceiling plate parts 21a and 21b Lateral side wall parts 22 of mounting seat Angle member 22a Horizontal plate Part 23a, 23b concave groove part 24 nut 25 groove part 26 protrusion (protrusion part)
27 Through-hole 28 Recessed concave part 29 Vertical wall part 30 Side wall part S1, S2 Vertical contact surface in locking means S3, S4 Added second vertical contact surface

Claims (3)

A back panel with wheel units rising from the rear side of the rectangular loading platform and lower left and right ends, and left and right panels with wheel units rising from the left and right sides of the loading platform and under the front end, The loading platform is connected to the lower side of the back panel so that it can be raised and lowered, and at least one of the left and right side panels is connected to the back panel so as to be swingable horizontally. When the loading platform portion is in the horizontal lying posture, it engages with the front end portions of the left and right side panels to prevent the loading platform portion from rotating to the standing posture and swinging outward of the one side panel. a freely carriage folding the locking means is provided, said locking means left the blocking in contact with each other swing to the outside of one side panel during engaging action against both sides the panel, said one side panel of Side vertical Separately from the contact surface and the vertical contact surface on the loading platform portion side, the loading platform portion prevents mutual swinging of the one side panel by contacting each other simultaneously with the contact between the two vertical contact surfaces. In a foldable cart provided with a second vertical contact surface on the side and a second vertical contact surface on the one side panel side ,
The second vertical abutment surface on the loading platform part side is configured by a side surface of a protrusion projecting downward from the bottom surface of the loading platform part, and the second vertical abutment surface on the one side panel side It is composed of an inner surface of a through hole provided at a position where the projection of the mounting seat of the wheel unit attached to the lower side of the front end of the side panel is fitted,
The mounting seat of the wheel unit is formed of a rectangular plate that is welded and fixed to the lower side of the one side panel and protrudes inward from the lower side, and from the lower side of the one side panel of the rectangular plate The inwardly projecting part has two rising sides bent upward from both front and rear sides, and a lower open gate projection formed by bending the rectangular plate at a central position between the rising sides. And the through hole forming the second vertical abutting surface on the one side panel side is formed in a ceiling plate portion of the gate-shaped ridge portion of the mounting seat of the wheel unit. Free cart. The mounting seat of the wheel unit includes both rising sides bent upward from both front and rear sides of the rectangular plate, and a lower open first half formed by bending the rectangular plate at a central position between the rising sides. A gate-shaped ridge portion and a rear half side wall portion obtained by cutting off the ceiling plate portion of the front half portal ridge portion, and the one side panel of the one side panel of the rear half side portion and the latter half side wall portion The foldable cart according to claim 1, which is welded to the lower side . The second vertical abutment surface on the loading platform side is a longitudinal direction formed by extending and projecting a vertical wall portion extending in the longitudinal direction between at least the recessed portions open at the lower side arranged in the loading platform. The foldable cart according to claim 1 or 2, wherein the trolley is formed on one side of a long protrusion .

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