JP2009001090A - Wheeled cart - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To arrange a caster nearer to a corner part of a wheeled cart than the prior art wheeled cart, prevent the wheeled cart from being inclined even when a cargo is mounted near the corner part of the wheeled cart or near a frame wall of the wheeled cart, and additionally improve running stability of the wheeled cart. <P>SOLUTION: An engagement protrusion 11a of a caster lock arm 11 formed at a caster fixing part E of a cart body D' is positioned at the central part of the cart body, its root part 11c is constituted to be positioned at a peripheral wall 2 of the cart body and at the same time a seat plate c1 of a caster C is engaged with the caster lock arm, thereafter a lock member H arranged at the rear surface of the cart body is moved to the peripheral wall of the cart body, thereby a fitted protrusion 4a of the lock arm h4 for the lock member formed at the lock member is fitted to a fitting hole 11b punched at the engagement protrusion of the lock arm for the caster. <P>COPYRIGHT: (C)2009,JPO&INPIT

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.

  In order to achieve the above-described object, the present invention provides a cart having a cart body and casters attached to the corners on the back surface of the cart body. The locking projection is located on the center side of the carriage body, and its root is located on the peripheral wall side of the carriage body, and the caster seat plate is locked to the caster lock arm. After that, the lock member disposed on the back surface of the cart body is moved to the peripheral wall of the cart body, so that the fitting protrusion of the lock arm for the lock member formed on the lock member is engaged with the lock arm for the caster. It is configured to be fitted into a fitting hole formed in the protrusion.

  The locking projection of the caster lock arm formed on the caster mounting portion of the cart body is located on the center side of the cart body, and its root is located on the peripheral wall side of the cart body. Therefore, compared to conventional carts, casters can be placed closer to the corners of the cart body. Therefore, when a load is placed near the corners of the cart or the frame wall of the cart, However, the cart does not tilt, and the running stability of the cart is improved.

  In addition, after the caster seat plate is locked to the caster lock arm, the lock member is arranged on the back surface of the cart body, and then moved to the peripheral wall of the cart body. Compared to the conventional cart in which the lock member is inserted from the outside into the receiving port or opening formed in the peripheral wall of the cart body, such a receiving port or opening is formed in the peripheral wall of the cart body. Therefore, it is possible to prevent the strength and rigidity of the peripheral wall from being lowered, and as a result, the strength and rigidity of the carriage 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.

  A hanging rib on the back surface 1 ′ of the mounting plate 1 is parallel to the short-side peripheral wall portion 2 b of the peripheral wall 2 and has substantially the same height as the peripheral wall 2 (height from the back surface 1 ′ of the mounting plate 1). 3 is formed. In the present embodiment, the hanging rib 3 is formed as a bridging rib that connects the central portions of 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 inner portion and the rear portion hanging rib 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.

  8 is a plurality of top-side hanging ribs that are formed on the back surface 1 'of the mounting plate 1 and connect the back-side hanging rib 3 and the short-side peripheral wall portion 2b and are parallel to the long-side-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.

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

  In the region surrounded by the opposing top hanging rib 8 parallel to the long side peripheral wall portion 2a and the portion 9a1 parallel to the short side peripheral wall portion 2b of the substantially U-shaped inner frame 9a, its lower surface is A flat plate 10 that is flush with the flat virtual plane formed by the lower end 8a of the part-hanging rib 8 is formed. The plate member 10 has substantially the same length as the length along the long side peripheral wall portion 2a of the substantially U-shaped inner frame member 9, and is opposed to the top hanging rib parallel to the long side peripheral wall portion 2a. By forming a slit s1 extending from the front end of the plate member 10 to the vicinity of the short peripheral wall portion 2b along the plate 8, the plate member 10 has an elastically deformable caster having a free end on the back side hanging rib 3 side. A lock arm 11 is formed. A locking projection 11 a is formed on the back surface near the free end of the caster lock arm 11, and the bottom surface of the caster lock arm 11 is formed on the bottom surface of the caster lock arm 11 from the base side of the caster lock arm 11. An inclined surface 11a ′ inclined upward toward the free end is formed, and a vertical surface 11a ″ parallel to the short side peripheral wall portion 2b is formed on the locking projection 11a. A fitting hole 11b is formed in the locking projection 11a.

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

  h <b> 1 is a base block having a substantially U-shaped planar shape, and the base block h <b> 1 connects the opposite side prisms h <b> 1 a parallel to each other and the vicinity of one end of the opposite side prisms h <b> 1 a. In addition, it is composed of a connecting prism portion h1b perpendicular to the side prism portion h1a.

  The central portion of the upper surface of the connecting prismatic portion h1b of the base block h1 is perpendicular to the longitudinal direction of the connecting prismatic portion h1b, and the tip thereof is a predetermined length from one end face h1b ′ of the connecting prismatic portion h1b. A protruding center fitting portion H1 is formed, and the tip of the upper side of the opposite side prism portion h1a of the base block h1 is from one end face h1a ′ of the side prism portion h1a. A side fitting portion H2 protruding a predetermined length is formed. The center fitting part H1 is formed shorter than the side part fitting part H2, and a guide slit s2 is formed between the center fitting part H1 and the side part fitting part H2.

  The center fitting part H1 located on the base block h1 side is provided with a through hole h2 having a square planar shape, and from the through hole h2 toward the front end face h3 of the center fitting part H1. By forming a pair of parallel slits s3, an elastically deformable lock member lock arm h4 is formed. Further, a fitting protrusion h4a is provided vertically on the back surface of the lock member lock arm h4 on the free end side.

  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, the upper surface of the seat plate c 1 of the caster C is brought into contact with the lower end 8 a of the top hanging rib 8. 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 "). C1a is formed between the flat virtual plane formed by the lower end 8a of the top hanging rib 8 and the top plate 9c of the substantially U-shaped inner frame member 9. Before and after the insertion of the one opposite side c1a of the seat plate c1 of the caster C into the gap, the seat of the caster C is inserted as shown in FIG. The front end c1b of the seat plate c1 in the insertion direction of the plate c1 comes into contact with the inclined surface 11a ′ constituting the locking projection 11a of the caster lock arm 11 formed on the caster mounting portion E of the cart body D ′. As a result, the caster lock arm 11 moves upward. It will be dynamic.

  Thereafter, when the caster C is further moved in the direction of the short side peripheral wall 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 11 for casters. Accordingly, the caster lock arm 11 is rotated downward by the elastic restoring force to return to a substantially horizontal state, as shown in FIG. As shown, the rear end c1c of the seat plate c1 is in contact with or close to the vertical surface 11a "of the locking projection 11a constituting the caster lock arm 11. It will be. 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 11a "of the locking projection 11a constituting the lock arm 11 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 disposed so that the front end surface of the center fitting portion H1 and the front end surface of the side fitting portion H2 face the short side peripheral wall portion 2b, and the central fitting portion H1 and the side portion. By inserting the two top hanging ribs 8 into the guide slits s2 formed between the fitting portions H2, the central fitting portion H1 of the lock member H becomes a pair of top hanging ribs 8 respectively. Of the pair of side fitting portions H2, the side fitting portion H2 in the vicinity of the long side peripheral wall portion 2a is disposed on the long side peripheral wall portion 2a and the long side peripheral wall portion 2a side. It is inserted between one top hanging rib 8 located, and the other side fitting part H2 is arranged between the other top hanging rib 8 and the central bridge hanging rib 5. It will be.

  Further, when the lock member H is moved in the direction of the short side wall portion 2b, the center fitting portion H1 of the lock member H is the upper surface of the caster lock arm 11 formed on the caster mounting portion E of the cart body D ′. 11 'and the back surface 1' of the mounting plate 1 are fitted together, and the pair of side fitting portions H2 of the lock member H are the upper surface c1 'of the seat plate c1 of the caster C and the mounting plate 1 Between the back surface 1 'and the back surface 1'.

  Further, when the lock member H is moved in the direction of the short side wall portion 2b, the inclined surface h4a ′ formed on the fitting protrusion h4a of the lock member lock arm h4 formed on the lock member H is The lock member lock arm h4 contacts the caster lock arm 11 formed on the caster mounting portion E of D ', and the lock member lock arm h4 rotates upward. Since the caster lock arm 11 is in contact with the seat plate c1 of the caster C, it does not rotate downward. After that, when the lock member H is further moved in the direction of the short side wall portion 2b, the lock member lock arm h4 is rotated downward by its elastic restoring force, and finally the lock member H The fitting protrusion h4a of the lock member lock arm h4 formed in the center fitting portion H1 is fitted into the fitting hole 11b formed in the locking projection 11a of the caster lock arm 11. .

  Finally, a fitting projection h4a of the lock member lock arm h4 formed in the central fitting portion H1 of the lock member H is a fitting hole 11b formed in the locking projection 11a of the caster lock arm 11. As described above, the central fitting portion H1 of the lock member H is placed on the upper surface 11 ′ of the caster lock arm 11 formed on the caster mounting portion E of the cart body D ′. The caster lock arm 11 is not elastically deformed upward even when a load is applied to the caster C because it is fitted between the rear surface 1 ′ of the plate 1 and therefore the seat plate c1 of the caster C. Is disengaged from the vertical surface 11a "of the locking projection 11a constituting the caster lock arm 11, and the caster C is moved in the direction of the back hanging rib 3 to be disengaged from the caster mounting portion E of the cart body D '. It is possible to prevent that.

  As described above, the caster lock arm 11 has the locking projection 11a formed on the back surface near the free end thereof located on the back drooping rib 3 side (the center side of the cart body D ′), Since the base portion 11c is configured to be positioned 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 connected to the cart body. When attached to the caster attachment portion E formed at the four corners of the back surface of 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 peripheral wall portion 2b. Therefore, 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, unlike the conventional cart in which the lock member H is configured to be inserted from the outside into the opening formed in the peripheral wall 2 of the cart body D ′, the lock member H is mounted on the cart body D ′. Since it arrange | positions at the back surface 1 'side of the mounting plate 1, and is moved after that to the surrounding wall 2 of the trolley | bogie main body D', the opening part etc. are not formed in the surrounding wall 2 of the trolley | bogie main body D '. Therefore, it is possible to prevent the strength and rigidity of the peripheral wall 2 from being lowered as compared with the conventional cart in which the opening is formed in the peripheral wall 2, and thus the strength and rigidity of the cart C are improved. To do.

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 below of the lock member constituting the carriage of the present invention. FIG. 7 is a perspective view from below of the lock member that constitutes the carriage of the present invention, similar to FIG. 6. FIG. 8 is a perspective view of a caster, a lock member, and a cart body for explaining the mounting of the caster constituting the cart of the present invention to the caster mounting part. FIG. 9 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. 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 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. 12 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.

Explanation of symbols

D ... Dolly D '... Dolly body E ... Caster mounting part H ... ······ Lock member h4 ········ Lock arm for lock member h4a ····································· 2 ... Peripheral wall 2a ... Long side peripheral wall 2b ... Short side peripheral wall 3 ... ··············································································. ..Locking protrusion

Claims (1)

  In a cart having a cart main body and casters attached to the corners on the back of the cart main body, a locking projection of a lock arm for casters formed on the caster mounting portion of the cart main body is on the center side of the cart main body. The lock member is arranged on the back surface of the cart body after the caster's seat plate is locked to the caster lock arm, and the base portion is positioned on the peripheral wall side of the cart body. Is moved to the peripheral wall of the bogie body so that the fitting protrusion of the locking member lock arm formed on the locking member is fitted into the fitting hole formed in the locking protrusion of the caster lock arm. A cart characterized by being configured to fit together.

Images