JP4856588B2 - Trolley - Google Patents

Description

  The present invention relates to a carriage composed of a carriage body and casters attached to four corners on the back surface of the carriage body.

  In the present applicant, in the previous patent application (Patent Document 1), from the outside of the frame wall of the cart body, the caster is inserted into the gap formed by the lower support wall and the upper support wall formed in the caster mounting portion. By inserting a lock member from the outside of the frame wall of the cart body into the receiving port formed by inserting the seat plate and then cutting the frame wall of the cart body upward from the lower end, the cart Proposed a trolley configured to attach casters to the body.

JP 2006-62429 A

  In the cart disclosed in the above-mentioned previous application, the frame wall of the cart body is formed with a receiving opening that is opened downward in order to insert the lock member. There was a problem of a significant drop.

  Further, in the cart disclosed in the above-mentioned previous application, the upper surface facing wall can be elastically deformed by forming a pair of slits from the frame wall side of the cart body at a predetermined interval. A cantilevered lock arm is formed, and a lock protrusion is formed on the lower surface of the lock arm located on the frame wall side. Then, the caster seat plate is inserted into the gap formed by the lower support wall and the upper support wall from the outside of the frame wall, and the caster seat plate is attached to the locking surface of the lock projection constituting the lock arm. Although the seat plate of the caster is configured not to be pulled out from the gap formed by the lower support wall and the upper support wall by being hooked, the lock projection of the lock arm is provided on the frame wall side of the carriage body. Therefore, the seat plate of the caster is attached at least inside the length of the lock projection of the lock arm (the length of the lock projection along the longitudinal direction of the lock arm). Thus, if the seat plate of the caster, in other words, the caster is attached to the inner side of the cart body, the stability of the cart will be lost. When the casters are attached as close as possible to the four corners on the back surface of the cart body, the stability of the cart is improved. If the caster is attached to the inside of the corner of the cart body, the cart tilts or stabilizes when the load is placed near the corner of the cart or the frame wall of the cart. There is a problem of getting worse.

  An object of the invention of the present application is to solve the problems of the above-described conventional carriage.

The present invention, in order to achieve the object mentioned above, in the bogie and a caster mounted on the corner portion of the back surface of the carriage body and該台vehicle body, the first, side hanging rib of the peripheral wall side, close to the center side A substantially U-shaped inner frame formed in the vicinity of the side wall hanging side rib, the side wall hanging rib, the center side side wall hanging rib and the lower frame, and the upper end of the inner frame. A substantially U-shaped inner frame member formed of a side wall-side hanging rib on the peripheral wall side, a central side-side hanging rib and a top plate connected to the lower frame is formed on the long-side side wall portion A flat virtual plane formed by the lower ends of the parallel opposing ceiling hanging ribs and the lower ends of the lower ceiling hanging ribs of the opposing ceiling hanging rib parallel to the short side wall, and a substantially U-shaped inner frame Between the top plate of the member is formed a gap into which the seat plate of the caster can be fitted, In the region surrounded by the opposing top hanging rib parallel to the long side peripheral wall, the top hanging rib parallel to the short side peripheral wall, and the portion parallel to the lower frame of the substantially U-shaped inner frame A flat virtual plane and a flat plate whose lower surface is formed by the lower ends of the opposing top hanging ribs parallel to the long side peripheral wall and the lower ends of the top hanging ribs parallel to the short side peripheral wall Is formed, and an elastically deformable caster lock arm having a free end on the back hanging rib side is formed on the plate material, and the back surface near the free end of the caster lock arm is locked on the back surface. Protrusions are formed, and the upper surface of the seat plate of the caster is in contact with the lower end of the opposite ceiling rib parallel to the long side wall and the bottom of the ceiling rib parallel to the short side wall After that, move the caster in the direction of the short side wall and parallel to the long side wall And virtual flat plane formed by the lower ends of the ceiling portion hanging ribs parallel opposite top portion hanging rib at the lower end and the short side wall portion of the opposite top portion hanging ribs, of substantially U-shaped frame member The tip that is located in the insertion direction of the caster's seat plate is inserted into the gap formed between the top plate and the caster's lock arm. Second, the short side peripheral wall portion located between the side wall hanging rib on the peripheral wall side and the central side hanging rib has a lock member insertion opening leaving the lower end of the short side wall portion. The lock member insertion opening is formed with a lock formed of a mounting board and a fitting portion formed on one vertical side surface of the mounting board and extending perpendicularly to the one vertical side surface. member is the fitted those configured to so that.

  The locking protrusion formed on the back surface near the free end of the caster lock arm is located on the center side of the cart body, and the base is located on the peripheral wall side of the cart body. Therefore, compared to the bogie, when the baggage is placed near the bogie corner or near the bogie frame wall, the bogie does not tilt, and the running stability of the bogie is improved. .

  The lock member insertion opening formed in the peripheral wall of the carriage body is configured so that the entire periphery of the lock member insertion opening is surrounded by the side hanging rib and the lower frame facing the mounting plate. Therefore, it is possible to prevent the strength and rigidity of the peripheral wall in which the lock member insertion opening is formed from being lowered as compared with the opening formed in the conventional carriage, which is opened at the lower side. The strength and rigidity of the cart are improved.

  As shown in FIGS. 1 and 2, the carriage D is removably attached in the vicinity of four corners on the rear surface of the carriage body D ′ having a substantially square shape and the carriage body D ′. Caster C. As is well known, the caster C has a square seat plate c1 and wheels c2.

  The carriage main body D ′ includes a mounting plate 1 on which a load is placed and a substantially planar shape of the loading plate 1, and a circumference projecting from the upper side of the mounting plate 1 along the periphery of the mounting plate 1. And a peripheral wall 2 extending substantially vertically downward from the periphery of the mounting plate 1 from the periphery of the mounting plate 1. In this embodiment, since the mounting plate 1 is formed in a substantially rectangular shape, the peripheral wall 2 positioned on the long side opposite to the mounting plate 1 is referred to as a long side peripheral wall portion 2a. The peripheral wall 2 positioned on the opposite short side of 1 is referred to as a short side peripheral wall 2b. Therefore, the peripheral wall 2 is comprised by the opposing long-side peripheral wall part 2a and the opposing short-side peripheral wall part 2b.

  Caster mounting portions E are formed at the four corners on the back surface of the cart body D '. Below, the caster attachment part E is demonstrated using FIGS. Since the caster mounting portions E formed at the four corners on the back surface of the cart body D 'are all formed in the same manner, only one caster mounting portion E will be described below.

  The back surface 1 ′ of the mounting plate 1 is parallel to the short side peripheral wall portion 2b of the peripheral wall 2 and in the vicinity of the short side peripheral wall portion 2b (approximately from the back surface 1 ′ of the mounting plate 1). The hanging rib 3 having a height of 2 is formed. In the present embodiment, the hanging rib 3 is formed as a bridging rib that connects the opposed long side peripheral wall portions 2a. Hereinafter, this hanging rib 3 is referred to as a back portion hanging rib.

  Further, the back surface 1 ′ of the mounting plate 1 is parallel to the long side peripheral wall 2 a of the peripheral wall 2 and in the vicinity of the long side peripheral wall 2 a (approximately the same height as the peripheral wall 2). A hanging rib 4 'having a height from the back surface 1' is formed, one end of the hanging rib 4 'is connected to the short peripheral wall 2b, and the other end of the hanging rib 4'. A predetermined gap is formed between the first and second hanging ribs 3. Hereinafter, the hanging rib 4 ′ is referred to as a side wall hanging rib on the peripheral wall side. Further, on the back surface 1 ′ of the mounting plate 1, a hanging rib 4 ″ similar to the side wall hanging rib 4 ′ on the peripheral wall side is formed in parallel with the side wall hanging rib 4 ′. One end of the rib 4 ″ is also connected to the short peripheral wall 2b, and a predetermined gap is formed between the other end of the hanging rib 4 ′ and the back hanging rib 3. Hereinafter, the hanging rib 4 ″ is referred to as a central side hanging rib. The side wall hanging rib 4 ′ on the peripheral wall side and the central side hanging rib 4 ″ are formed in the same shape.

  Reference numeral 5 denotes a central bridge-hanging rib formed on the back surface 1 ′ of the mounting plate 1, which connects the center portions of the opposing short side peripheral wall portions 2 b. The other end on the back side hanging rib 3 side of the center side side hanging rib 4 ″ and the central bridge hanging rib 5 are formed on the back surface 1 ′ of the mounting plate 1 in parallel to the short side peripheral wall portion 2b. The other end of the side wall hanging side rib 4 'on the side wall hanging side rib 3' and the short side wall portion 2b are parallel to the short side wall portion 2b. In addition, they are connected by connecting hanging ribs 7 formed on the back surface 1 ′ of the mounting plate 1.

  A lock member which will be described later is inserted into the short peripheral wall 2b located between the peripheral wall side hanging rib 4 'and the central side hanging rib 4 ", leaving the lower end of the short circumferential wall 2b. A rectangular lock member insertion opening A1 is formed.The lock member insertion opening A1 includes the mounting plate 1, the side wall-side hanging rib 4 ', the central side-side hanging rib 4 ", and the remaining lower end. It is surrounded by a lower frame 2b1 formed as a part.

  Reference numeral 8 denotes a top hanging rib formed on the back surface 1 'of the mounting plate 1 and extending from the back portion hanging rib 3 to the vicinity of the lock member insertion opening A1 and parallel to the long side peripheral wall portion 2a. In the present embodiment, two top hanging ribs 8 are formed. Most of the lower end 8a of the top hanging rib 8 is lower than the height of the peripheral wall 2, the side hanging rib 4 'on the peripheral wall side, and the central side hanging rib 4 "except for the vicinity of the back hanging rib 3. Therefore, the lower end 8a of the top hanging rib 8 is positioned above the lower end of the peripheral wall 2, the lower end of the side hanging rib 4 'on the peripheral wall side, and the lower end of the central side hanging rib 4 ". ing.

  9 is connected to the other end of the side wall hanging rib 4 ′ on the peripheral wall side and the other end of the central side hanging rib 4 ″ formed on the back surface 1 ′ of the mounting plate 1, and the short side. It is a ceiling hanging rib parallel to the peripheral wall 2b, and a flat virtual plane is formed by the lower end 8a of the ceiling hanging rib 8 and the lower end 9a of the ceiling hanging rib 9, and the seat plate c1 of the caster C As will be described later, the upper surface is in contact with and guided by the lower end 8a of the top hanging rib 8 and the lower end 9a of the top hanging rib 9.

  10a is provided along the side wall-side hanging rib 4 ', the central side hanging rib 4 "and the lower frame 2b1, and the side wall hanging rib 4', the center side hanging rib 4" on the circumferential wall side, and It is a substantially U-shaped inner frame formed in the vicinity of the lower frame 2b1, and the inner frame 10a includes a side wall hanging rib 4 'on the peripheral wall side, a center side wall hanging rib through an appropriate number of connecting short ribs 10b. 4 ″ and the lower frame 2b1, respectively. Further, the upper end of the inner frame 10a is connected to the side wall hanging rib 4 ′, the central side hanging rib 4 ″ and the lower frame 2b1 at the upper end of the inner frame 10a. A top plate 10c is formed, and a substantially U-shaped inner frame member 10 having a substantially U shape is formed by the inner frame 10a, the connecting short rib 10b, and the top plate 10c. Further, a caster C is provided between a flat virtual plane formed by the lower end 8 a of the top hanging rib 8 and the lower end 9 a of the top hanging rib 9 and the top plate 10 c of the substantially U-shaped inner frame member 10. A gap into which one opposite side portion of the seat plate c1 can be fitted is formed.

  An opposing top hanging rib 8 parallel to the long side peripheral wall 2a, a top hanging rib 9 parallel to the short side peripheral wall 2b, and a portion 10a1 parallel to the lower frame 2b1 of the substantially U-shaped inner frame 10a In the region surrounded by, a plate material 11 whose lower surface is flush with the flat virtual plane formed by the lower end 8a of the top hanging rib 8 and the lower end 9a of the top hanging rib 9 is formed. And while forming the short slit s1 in the board part 11 along the top part hanging rib 9 parallel to the short side peripheral wall part 2b, it is relative to the long side peripheral wall part 2a from the both ends of the short slit s1. By forming a long slit s2 in the plate portion 11 along the top portion hanging rib 8, the plate material 11 has an elastically deformable caster lock arm 12 having a free end on the back portion hanging rib 3 side. Is formed. A locking projection 12a is formed on the back surface near the free end of the caster lock arm 12, and the bottom surface of the caster lock arm 12 is formed on the lower surface of the lock projection 12a from the root side of the caster lock arm 12. An inclined surface 12a ′ that is inclined upward toward the free end is formed, and a vertical surface 12a ″ that is parallel to the short-side peripheral wall portion 2b is formed on the locking projection 12a.

  Between the side wall hanging rib 4 'on the peripheral wall side and the top wall hanging rib 8 facing the side wall hanging rib 4' on the circumferential wall side, and the center side hanging rib 4 "and the center side hanging rib 4 ″ and the back surface 1 ′ of the mounting plate 1 located between the opposing ceiling hanging ribs 8 are connected to the ceiling hanging ribs 9 parallel to the short side wall portion 2b. Further, a contact hanging rib 13 perpendicular to the ceiling hanging rib 9 is formed on the back surface 1 ′ of the mounting plate 1 located near the ceiling hanging rib 9, and a lower end 13 a of the contact hanging rib 13 and A predetermined gap is formed between the lower end 8 a of the top hanging rib 8 and the flat virtual plane formed by the lower end 9 a of the top hanging rib 9.

  Next, the lock member H will be described with reference to FIGS. 6 and 7.

  The locking member H is formed on a substantially rectangular mounting board h1 and one vertical side face h1a of the mounting board h1, and three fitting portions extending perpendicularly to the one vertical side face h1a, That is, it has the center fitting part H1 and the side part fitting part H2 arrange | positioned on both sides of the center fitting part H1 at predetermined intervals. Since the basic configuration of the center fitting portion H1 and the side fitting portion H2 is the same, one side fitting portion H2 will be described below.

  Both side fitting parts H2 have a lower fitting part h2 and an upper fitting part h3 connected to one vertical side face h1a of the mounting substrate h1.

  The lower fitting portion h2 has a tip end portion that is inclined downward, and includes a horizontally long side wall h2a that is perpendicular to one vertical side surface h1a of the mounting substrate h1, and a top plate h2b. H2c is an intermediate wall formed between the side walls h2a and having the same shape as the side wall h2a. The lower end h2 'of the lower fitting part h2 extends to the vicinity of the lower end h1b of the mounting substrate h1.

  The upper fitting part h3 is perpendicular to the vertical side face h1a of the mounting board h1, is connected to the mounting board h1, and is formed on the upper surface of the top plate h2b of the lower fitting part h2. A vertical rib h3a is provided. The upper fitting portion h3 is formed such that the distance from the mounting substrate h1 is shorter than the lower fitting portion h2, and the upper end h3 ′ of the upper fitting portion h3, in other words, the upper end h3a ′ of the vertical rib h3a. Is formed flush with the upper end h1c of the mounting substrate h1. In the present embodiment, an example in which the upper fitting portion h3 is constituted by three vertical ribs h3a is shown.

  Out of the side walls h2a constituting the lower fitting part h2, the side wall h2a located on the outer side (the side wall h2a located on the inner side opposite to the central fitting part H1 and the side wall h2a located on the opposite side via the intermediate wall h2c) ) And the intermediate wall h2c are connected by a connecting plate h4 parallel to the mounting substrate h1. The lower end portion of the connecting plate h4 is connected to an elastically deformable cantilevered locking member lock arm h5 extending substantially perpendicular to the connecting plate h4 and extending in the direction of the mounting substrate h1. A locking projection h5b is formed on the lower surface h5a near the free end of the lock arm h5, and the free end of the locking member lock arm h5, in other words, the mounting board is formed on the lower surface of the locking projection h5b. An inclined surface h5b ′ inclined downward toward h1 is formed, and a vertical surface h5b ″ is formed at the tip of the locking projection h5b. The lower end of the locking projection h5b is The mounting substrate h1 protrudes downward beyond the lower end h1b.

  In the center fitting portion H1, the lower fitting portion h2 and the upper fitting portion h3 constituting the center fitting portion H1 are both the lower fitting portion h2 and the upper fitting portion h3 constituting the side fitting portion H2. Since the center fitting portion H1 is the same as the side fitting portion H2 except that the locking arm for locking member h5 is not formed in the center fitting portion H1, the details of the center fitting portion H1 are detailed. Description is omitted.

  Next, the attachment of the caster C to the caster attachment part E formed in the vicinity of the four corners on the back surface of the cart body D 'will be described with reference to FIGS.

  First, as shown in FIG. 8, the upper surface of the seat plate c <b> 1 of the caster C is arranged on the back side of the bottom hanging rib 3 of the lower end 8 a of the top hanging rib 8 and the lower end 9 a of the top hanging rib 9. The lower end 8a of the top hanging rib 8 and the lower end 9a of the top hanging rib 9 are in contact with each other. Thereafter, the caster C is moved in the direction of the short side peripheral wall 2b, and one opposing side of the seat plate c1 of the caster C (the peripheral side side hanging rib 4 'and the central side hanging rib 4 "). A flat virtual plane formed by the lower end 8a of the ceiling hanging rib 8 and the lower end 9a of the ceiling hanging rib 9, and a substantially U-shaped inner frame member. 10 is inserted into a gap formed between the top plate 10c and the top plate 10c of the caster C. FIG. As shown, the front end c1b of the seat plate c1 in the insertion direction of the seat plate c1 of the caster C is the locking projection 12a of the caster lock arm 12 formed on the caster mounting portion E of the cart body D ′. By contacting the inclined surface 12a 'constituting the Tar lock arm 12 will pivot upwards.

  Thereafter, when the caster C is further moved in the direction of the short side peripheral wall portion 2b, the rear end c1b of the seat plate c1 located behind the caster C in the insertion direction of the seat plate c1 is engaged with the lock arm 12 for the caster. Accordingly, the caster lock arm 12 is rotated downward by the elastic restoring force to return to a substantially horizontal state, and the seat plate c1. The rear end c1c is in contact with or close to the vertical surface 12a "of the locking projection 12a constituting the caster lock arm 12. Therefore, from this state, even if the caster C is horizontally moved in the direction of the inner portion hanging rib 3, the seat plate c1 of the caster C is placed on the vertical surface 12a "of the locking projection 12a constituting the lock arm 12 for casters. Accordingly, the caster C is prevented from moving in the direction of the inner portion hanging rib 3.

  Thereafter, the lock member H is inserted into the lock member insertion opening A1 formed in the short side peripheral wall portion 2b. The central fitting portion H1 constituting the lock member H is opposed to the long side peripheral wall portion 2a. One side fitting portion H2 of the pair of side fitting portions H2 that constitute the lock member H is inserted between the top hanging ribs 8 parallel to the side hanging ribs 4 on the peripheral wall side. And the other side fitting of the pair of side fitting portions H2 constituting the lock member H. The joint H2 is inserted between the central side hanging rib 4 ″ and the top side hanging rib 8 facing the central side hanging rib 4 ″.

  A central fitting portion H1 constituting the lock member H is inserted between the top hanging ribs 8 parallel to the opposing long side peripheral wall portion 2a, and a pair of side fitting portions H2 constituting the lock member H. One side fitting portion H2 is inserted between the side wall hanging rib 4 ′ on the peripheral wall side and the top portion hanging rib 8 facing the side wall hanging rib 4 ′ on the peripheral wall side, and further, a lock member. The other side part fitting part H2 of the pair of side part fitting parts H2 constituting the H is the top part hanging opposite to the center side side part hanging rib 4 "and the center side side part hanging rib 4". In the final stage of insertion between the ribs 8, the inclined surface h5b ′ of the lock member lock arm h5 constituting the lock member H abuts on the upper end of the lower frame 2b1 constituting the lock member insertion opening A1, and the lock member The lock arm h5 is pivoted upward. Thereafter, when the lock member H is further moved in the direction of the inner portion hanging rib 3, the inclined surface h5b 'of the lock member lock arm h5 is detached from the lower frame 2b1, and the lock member lock arm h5 is elasticated. By returning to a substantially horizontal state by rotating downward by the restoring force, the vertical surface h5b ″ of the lock arm h5 for the lock member comes into contact with the inner surface 2b1 ′ of the lower frame 2b1, or the inner surface 2b1 of the lower frame 2b1. Will be located closer to '.

  In the final position where the lock member H is inserted into the lock member insertion opening A1, as described above, the vertical surface h5b ″ of the lock member lock arm h5 formed on the lock member H is formed on the cart body D ′. The side part on the side of the peripheral wall formed in the cart body D ′ while being in contact with or close to the inner surface 2b1 ′ of the lower frame 2b1 constituting the lock member insertion opening A1 Between the hanging rib 4 'and the top hanging rib 8 facing the side wall hanging rib 4' on the peripheral wall side, and facing the central side hanging rib 4 "and the center side hanging rib 4". The lower fitting which comprises the side fitting part H2 which comprises the locking member H to the lower end 13a of the contact | abutting hanging rib 13 formed in back surface 1 'of the mounting board 1 located between the top part hanging ribs 8 The top plate h2b of the joint part h2 is in contact or Chikashi and is configured to be positioned.

  As described above, the caster lock arm 12 has the locking projection 12a formed on the back surface in the vicinity of the free end thereof located on the back drooping rib 3 side (the central part side of the cart body D ′). Since the base portion 12b is configured to be located on the short side peripheral wall portion 2b side (the peripheral wall 2 side of the cart body D ') of the peripheral wall 2 constituting the cart body D', the caster C is When attached to the caster mounting portion E formed at the four corners on the back surface of the cart body D ′, the front end c1b of the seat plate c1 in the insertion direction of the seat plate c1 of the caster C is the short side. Since it will be located close to the peripheral wall 2b, the caster C can be arranged on the outer side (the peripheral wall 2 side of the cart body D '). Therefore, compared to the conventional cart described above, the cart is not tilted when the luggage is placed near the corner of the cart or near the frame wall of the cart, and the running of the cart is stable. Improves.

  Further, the lock member insertion opening A1 is entirely surrounded by the mounting plate 1, the side wall hanging rib 4 'on the peripheral wall side, the central side hanging rib 4 ", and the lower frame 2b1. Therefore, the strength and rigidity of the short-side peripheral wall portion 2b in which the lock member insertion opening A1 is formed are reduced as compared with the opening formed in the above-described conventional carriage that is open at the bottom. This can be prevented, and as a result, the strength and rigidity of the carriage C are improved.

FIG. 1 is a perspective view from above of a carriage according to the present invention. FIG. 2 is a perspective view from below of the carriage of the present invention. FIG. 3 is a perspective view from the lower side of the carriage main body constituting the carriage of the present invention. FIG. 4 is an enlarged perspective view of the vicinity of the caster mounting portion of the cart body constituting the cart of the present invention. FIG. 5 is an enlarged perspective view similar to FIG. 4 partially including a vertical cross section. FIG. 6 is a perspective view from above of the lock member constituting the carriage of the present invention. FIG. 7 is a perspective view from below of the lock member constituting the carriage of the present invention. FIG. 8 is an enlarged perspective view for explaining the mounting of the caster constituting the carriage of the present invention to the caster mounting portion. FIG. 9 is an enlarged perspective view including a partial vertical cross-section for explaining the attachment of the caster constituting the carriage of the present invention to the caster attachment part, similar to FIG. FIG. 10 is an enlarged perspective view including a partial vertical cross-section for explaining the attachment of the caster constituting the carriage of the present invention to the caster attachment part, similar to FIG. FIG. 11 is a perspective view including a partial vertical section of a cart body and a lock member to which a caster constituting the cart of the present invention is attached. FIG. 12 is an enlarged perspective view including a partial vertical section of the carriage of the present invention in a state where the caster and the lock member are attached.

Explanation of symbols

A1 ... Lock member insertion opening D ... Dolly D '... Dolly body E ...・ ・ ・ ・ Caster mounting part H ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Lock member h5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Lock arm for lock member h5b ・ ・ ・ ・ ・ ・ ・ ・ ・ Locking protrusion Part 1 ... Placement plate 2 ... Peripheral wall 2a ... Long side peripheral wall 2b ... ···· Short-side peripheral wall 3 ························································································· .... Caster lock arm 12a ... Locking protrusion

Claims (2)

In a cart having a cart body and casters attached to the corners on the back surface of the cart body , along the side wall hanging side rib, the central side hanging rib and the lower frame, and the side wall hanging side A substantially U-shaped inner frame formed near the rib, the central side hanging rib and the lower frame, and a side wall hanging rib on the peripheral wall side, a central side hanging rib formed on the upper end of the inner frame, and A substantially U-shaped inner frame member formed from a top plate connected to the lower frame is formed, and parallel to the lower end of the opposing top hanging rib parallel to the long side peripheral wall and the short side peripheral wall The seat plate of the caster can be fitted between the flat virtual plane formed by the lower end of the lower ceiling of the ceiling hanging rib and the top of the substantially U-shaped inner frame member. A gap is formed, and the opposite ceiling ribs parallel to the long side wall and the short side In the area surrounded by the ceiling hanging rib parallel to the wall and the portion parallel to the lower frame of the substantially U-shaped inner frame, the lower surface of the area is the opposite ceiling hanging parallel to the long side peripheral wall. A flat imaginary flat surface formed by the lower end of the rib and the lower end of the top hanging rib parallel to the short side wall is formed, and the plate is free to the side depending on the back hanging rib. An elastically deformable caster lock arm having an end is formed, and a locking projection is formed on the back surface near the free end of the caster lock arm. After contacting the lower end of the opposite ceiling rib parallel to the side circumferential wall and the lower end of the ceiling hanging rib parallel to the short side circumferential wall, the caster is moved in the direction of the short side circumferential wall, Parallel to the lower edge of the opposite top rib and the short side wall parallel to the long side wall By inserting the virtual flat plane formed by the lower ends of the ceiling portion hanging rib of the top portion hanging ribs, the gap formed between the top plate of substantially U-shaped frame member against, casters A cart characterized in that a front end of the seat plate in the insertion direction is configured to be locked to a locking projection of a lock arm for casters . A locking member insertion opening is formed in the short peripheral wall portion located between the side wall hanging rib on the peripheral wall side and the central side hanging rib, leaving the lower end of the short side wall portion. The opening is fitted with a locking member formed of a mounting substrate and a fitting portion formed on one vertical side surface of the mounting substrate and extending perpendicularly to the one vertical side surface. The cart according to claim 1, wherein the cart is configured.

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