Truck

Abstract

To provide a truck easy in assembling work, and restraining an increase in weight.SOLUTION: The cart 1 includes a base part 2, a caster part 3 attached to a lower surface of the base part 2, and a lock member 4 for fixing the caster part 3 to the base part 2. The caster portion 3 includes a wheel portion 31 and a pedestal portion 30. The locking member 4 has an insertion piece 41. The base part 2 has a vertical regulating part 21 positioned apart downward from the lower surface, and an insertion gap 20 into which the pedestal part 30 and the insertion piece 41 are inserted between the lower surface and the vertical regulating part 21. The pedestal portion 30 and the insertion piece 41 are inserted into the insertion gap 20 such that the insertion piece 41 is located above the vertical restricting portion 21 and the pedestal portion 30 is located above the insertion piece 41. The vertical regulation part 21 and the insertion piece 41 are respectively provided with one and the other of an engaging part and an engaged part which are engaged with each other to regulate the movement of the insertion piece 41 in the horizontal direction with respect to the vertical regulation part 21.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a cart, and more particularly to a cart including a base and caster members attached to the underside of the base. [Background technology]

[0002] Conventionally, a transport cart is known that has casters attached to the four corners of the underside of the base (see, for example, Patent Document 1). In this transport cart, the casters attached to both sides of the front side of the base are swivel casters, and the casters attached to both sides of the rear side of the base are fixed casters. In a swivel caster, the wheels are rotatably attached to the wheel holders, and the wheel holders are rotatably attached to the base in the circumferential direction. The base of the swivel caster is fixed to the base with bolts and nuts. In a fixed caster, the wheels are rotatably attached to the wheel holders, and the wheel holders are fixed to the base with bolts and nuts.

[0003] The transport cart shown in Patent Document 1 uses a large number of bolts and nuts to secure the casters to the base. This increases the number of parts that make up the transport cart, making assembly difficult. In addition, the use of metal bolts and nuts increases the weight of the transport cart. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3806251 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a truck that is easy to assemble and whose weight is kept to a minimum. [Means for solving the problem]

[0006] In order to solve the above problems, one embodiment of the present invention provides a dolly comprising a base, caster members attached to the underside of the base, and a locking member for fixing the caster members to the base. The caster members have wheel members and a base member supported by the wheel members and attached to the underside of the base. The locking member has an insertion piece. The base has a vertical regulation member positioned below the underside and spaced apart from the bottom surface, and an insertion gap between the bottom surface and the vertical regulation member into which the base member and the insertion piece are inserted. The base member and the insertion piece are inserted into the insertion gap so that the insertion piece is positioned above the vertical regulation member and the base member is positioned above the insertion piece. The vertical regulation member and the insertion piece are each provided with an engaging portion and an engaged portion that engage with each other to regulate horizontal movement of the insertion piece relative to the vertical regulation member. [Effects of the Invention]

[0007] In the bogie according to the present invention, the assembly work is easy and an increase in weight can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a truck according to a first embodiment, seen from diagonally below. [Figure 2] FIG. 2 is a bottom view of the above bogie. [Figure 3] Fig. 3A is a partially enlarged view of Fig. 2. Fig. 3B is a partially enlarged view of the side of the dolly, and Fig. 3C is a partially enlarged view of the front of the dolly. [Figure 4] 4A and 4B are perspective views of the caster part of the dolly as viewed from diagonally above and below, respectively. [Figure 5] 5A and 5B are perspective views of the locking member of the dolly as viewed from diagonally above and below, respectively. [Figure 6] 6A and 6B are perspective views of the caster mounting portion of the base of the dolly as viewed from diagonally below, respectively, and are perspective views of a portion including a cut surface of the caster mounting portion as viewed from diagonally below. [Figure 7] Fig. 7A is a perspective view of the same as above, seen from diagonally below, with the base part arranged in the caster arrangement part, and Fig. 7B is a perspective view of the same as above, seen from diagonally below, with the base part and locking member arranged in the caster arrangement part. [Figure 8] Figure 8A is a cross-sectional view of the same, taken along a plane where the insert piece of the caster arrangement part is located, Figure 8B is a cross-sectional view of the same, taken along a plane where the elastic piece of the caster arrangement part is located, and Figure 8C is a cross-sectional view of the same, taken along a plane where the protruding piece of the caster arrangement part is located. [Figure 9] 9A, 9B, and 9C are perspective views of a main portion of an insertion portion of a truck according to a second embodiment, a bottom view of a main portion of a caster arrangement portion of the truck, and a perspective view of a portion including a cut surface of the main portion of the caster arrangement portion of the truck. [Figure 10] 10A, 10B, and 10C are perspective views of a main part of an insertion part of a truck according to a third embodiment, respectively, and are bottom views of a main part of a caster arrangement part of the truck. [Figure 11] Fig. 11A is a cross-sectional view of a truck according to a fourth embodiment, cut along a plane where an insert piece of a caster arrangement part is located, and Fig. 11B is a cross-sectional view of a truck according to a fifth embodiment, cut along a plane where an insert piece of a caster arrangement part is located. DETAILED DESCRIPTION OF THE INVENTION

[0009] FIELD OF THE INVENTION The present invention relates to a bogie. DETAILED DESCRIPTION OF THE INVENTION A bogie according to the present invention will be described below based on an embodiment shown in the accompanying drawings.

[0010] A dolly 1 according to a first embodiment will be described with reference to FIGS. 1 to 8C. As shown in FIGS. 1 to 3C, the dolly 1 includes a base 2, caster members 3, and a locking member 4. A load is placed on the top surface of the base 2. As shown in FIG. 2, the base 2 is rectangular in plan view, with each side measuring approximately 30 cm to 1 m. In this embodiment, the base 2 is rectangular in plan view and has a plurality of through-holes 200 that penetrate vertically. The base 2 is also integrally formed from resin. As shown in FIGS. 1 and 2, the front, back, left, and right of the dolly 1 are determined by design, with one side along the long sides being the front and the other being the rear, and one side along the short sides being the left and the other being the right. In this embodiment, the shape of the trolley 1 in a plan view is symmetrical (i.e., left-right symmetrical) around a line along the long side that passes through the center of the short side, and is also symmetrical (i.e., front-to-back symmetrical) around a line along the short side that passes through the center of the long side.

[0011] The base 2 has a peripheral rib 23 that protrudes downward from the outer peripheral edge of the lower surface. The peripheral rib 23 is continuous and uninterrupted around the entire outer peripheral edge of the lower surface of the base 2. The base 2 also has reinforcing ribs 24 on the inside surrounded by the peripheral rib 23 on the lower surface. The reinforcing rib 24 is mainly composed of ribs in a lattice shape, but there are also portions that do not form a lattice. The ends of the reinforcing ribs 24 are continuous with the peripheral rib 23, and the peripheral rib 23 and the reinforcing rib 24 are formed integrally. A through-hole 200 is formed in some of the areas surrounded by the reinforcing rib 24.

[0012] The caster unit 3 is attached to the underside of the base unit 2. In this embodiment, the caster unit 3 is provided at each of the four corners of the base unit 2, which is rectangular in plan view. FIGS. 4A and 4B show the caster unit 3. The caster unit 3 includes a base unit 30, a wheel unit 31, and a support unit 32. The wheel unit 31 includes a rotation shaft, a rim, a tire, and the like. The tire is preferably made of rubber, but is not particularly limited thereto. The support unit 32 includes a support piece that supports the wheel unit 31 so that it can rotate freely around a horizontal rotation shaft, and a connecting piece that connects to the base unit 30 so that it can rotate freely around an axis in the vertical direction. The rotatability of the connecting piece and the base unit 30 relative to each other allows the direction of the rotation shaft of the wheel unit 31 to be changed, and the traveling direction of the wheel unit 31 to be changed.

[0013] The base 30 has a generally rectangular plate shape in a plan view. The base 30 is indirectly supported by the wheel unit 31 via the support unit 32. The base 30 is attached to the underside of the base 2. The shape of the base 30 is not particularly limited. The rotation axis and rim of the base 30 and the wheel unit 31, and the support unit 32 are made of metal. Such caster units 3 are conventionally known, and any caster having at least the base 30 and the wheel unit 31 can be used as appropriate.

[0014] 5A and 5B show the locking member 4. The locking member 4 is a member for fixing the caster unit 3 to the base unit 2. The locking member 4 shown in FIGS. 5A and 5B is the same as the locking member 4 shown in FIGS. 3A to 3C) located at the front right corner of the base unit 2, and for convenience, the following description of the locking member 4 and its installation method will be given using the front, back, left and right of this locking member 4.

[0015] The locking member 4 has two insert pieces 41 and a connecting piece 42 that connects the two insert pieces 41 together.

[0016] The insertion piece 41 has an insertion portion 411 and a non-insertion portion 412. The insertion portion 411 is located at the rear of the insertion piece 41, including the rear end, and is inserted into an insertion gap 20 (see FIG. 6B) described below, while the non-insertion portion 412 is located forward of the insertion portion 411 and is the remaining portion that is not inserted into the insertion gap 20. The insertion portion 411 is formed in a wedge shape that becomes thinner in both the top and bottom directions toward the rear. More specifically, the upper surface of the insertion portion 411 is formed horizontally, and the lower surface is inclined so that it is positioned upward toward the rear.

[0017] 5B, a partition wall 413 protruding downward is formed on the underside of the insertion piece 41 between the insertion portion 411 and the non-insertion portion 412. In addition, a protrusion 414 protruding rearward and downward is formed on the left-right end and front end of the underside of the insertion portion 411 (i.e., on the partition wall 413).

[0018] Connecting pieces 42 are connected to the non-insertion portions 412. The connecting pieces 42 include a first connecting piece 421 that connects the front ends of both non-insertion portions 412 together, and a second connecting piece 422 that is positioned behind the first connecting piece 421 with a gap therebetween and connects the middle portions of the non-insertion portions 412 together.

[0019] An elastic piece 43 that protrudes rearward is formed in the center of the first connecting piece 421 in the left-right direction. A locking piece 431 that protrudes downward is formed at the rear end of the elastic piece 43. Furthermore, protruding pieces 44 that protrude rearward are formed on both the left and right sides of the elastic piece 43 of the first connecting piece 421. In this embodiment, the locking member 4 having the insertion piece 41 and the connecting piece 42 is integrally formed from resin. The locking member 4 is attached to the underside of the base 2. Furthermore, as shown in FIG. 5A , a notch 423 is formed in the upper surface of the first connecting piece 421, and a notch 424 is formed in the upper surface of the second connecting piece 422.

[0020] 5B, a triangular reinforcing rib 45 that connects the insertion piece 41 and the second connecting piece 422 is formed at the corner formed by the insertion piece 41 and the second connecting piece 422. This reinforcing rib 45 reinforces the locking member 4, and in particular, suppresses deformation of the insertion piece 41 in the horizontal direction.

[0021] 5A, a reinforcing rib 425 that protrudes forward and extends in the left-right direction is formed in the vertical center of the front end surface of first connecting piece 421. This reinforcing rib 425 prevents first connecting piece 421 from being damaged starting from notch 423 when first connecting piece 421 is bent and deformed in the horizontal direction.

[0022] 6A and 6B show the portion of the underside of the base 2 where the caster unit 3 and locking member 4 are attached. The underside of the base 2 is surrounded by a peripheral rib 23 and a reinforcing rib 24 to form a caster arrangement portion 22 into which the caster unit 3 and locking member 4 are inserted. The caster arrangement portion 22 is provided with a vertical regulation portion 21.

[0023] The vertical regulating portion 21 is located at a distance below the underside of the base 2. The vertical regulating portion 21 is provided at a position corresponding to the insertion piece 41 of the locking member 4 inserted into the caster arrangement portion 22. In this embodiment, the vertical regulating portion 21 is rib-shaped and protrudes toward the caster arrangement portion 22 from the reinforcing rib 24 that surrounds the caster arrangement portion 22. Two vertical regulating portions 21 are provided in each caster arrangement portion 22. An insertion gap 20 is formed between the vertical regulating portion 21 and the underside of the base 2, into which the base portion 30 of the caster unit 3 and the insertion piece 41 of the locking member 4 are inserted. The insertion gap 20 is formed so that the vertical distance becomes shorter toward the rear.

[0024] Further, a notch 211 that is open forward is formed at the front end of the vertical regulation portion 21 at the left and right ends (that is, the portions adjacent to the reinforcing rib 24).

[0025] An attachment rib 25 is provided on the caster arrangement section 22 so as to be located between the first connecting piece 421 and the second connecting piece 422 and immediately behind the first connecting piece 421 when the base section 30 and the locking member 4 are attached (referred to as an attached state) (see FIGS. 8A and 8B). An elastic piece insertion hole 26 through which the elastic piece 43 is inserted is formed in the attachment rib 25 at a position corresponding to the elastic piece 43 of the locking member 4 in the attached state (see FIG. 8B). Furthermore, a protruding piece insertion hole 27 through which the protruding piece 44 is inserted is formed in the attachment rib 25 at a position corresponding to the protruding piece 44 of the locking member 4 in the attached state (see FIG. 8C).

[0026] 6A and 6B, the caster arrangement section 22 is formed with a base restriction section 281 that restricts the base 30 from moving forward, i.e., restricts the base 30 from moving in the direction of coming out of the insertion gap 20. In this embodiment, a base restriction rib 28 is formed at a predetermined location on the underside of the base 2, and the rear end portion (the end portion on the insertion gap 20 side) of the base restriction rib 28 serves as the base restriction section 281. The lower end surface of the front portion of the base restriction rib 28 forms an inclined surface 282 that slopes downward as it moves forward.

[0027] Furthermore, a reinforcing rib that extends in the left-right direction and protrudes downward is formed in the caster arrangement section 22 (underside of the base 2) in a portion between the vertical regulation sections 21 on both the left and right sides. This reinforcing rib is formed as a tapered rib that is widest at both left and right ends of the caster arrangement section 22 and becomes narrower as it approaches the center of the caster arrangement section 22. This makes it possible to design the slide mold so that it can be easily removed in the left-right direction from the insertion gap 20 when molding the base 2. Note that this reinforcing rib does not have to be a tapered rib, and it does not necessarily have to be formed at all.

[0028] Furthermore, the base restriction rib 28 may be formed as a tapered rib that is widest at the front end (length in the left-right direction) and becomes narrower toward the rear. This allows for a design that makes it easier to remove the slide mold rearward from the elastic piece insertion hole 26 and the protruding piece insertion hole 27 when molding the base 2. The base restriction rib 28 does not have to be a tapered rib, and does not necessarily have to be formed at all.

[0029] A method for attaching the caster part 3 to the base part 2 using the locking member 4 will be described below.

[0030] First, the base portion 30 of the caster unit 3 is placed in the caster arrangement portion 22 of the base portion 2, and as shown in Fig. 7A, the base portion 30 is inserted into the insertion gap 20 from the front. At this time, since the inclined surface 282 is formed in the front portion of the base portion restricting rib 28, the rear end portion of the base portion 30 is brought into contact with the underside of the base portion 2 in front of the vertical restricting portion 21, and the front end portion of the base portion 30 is brought into contact with the inclined surface 282, and the base portion 30 is slid rearward along the underside of the base portion 2 (including the inclined surface 282), so that the base portion 30 is inserted into the insertion gap 20. The inclined surface 282 formed in the base portion restricting rib 28 makes it easy to insert the base portion 30 into the insertion gap 20.

[0031] The pedestal portion 30 inserted into the insertion gap 20 is restricted from moving in the left and right direction by the reinforcing ribs 24 located on both the left and right sides. In addition, the pedestal portion 30 is restricted from moving rearward by the reinforcing rib 24 located on the rear side. In addition, the pedestal portion 30 is restricted from moving forward by the pedestal portion restricting portion 281.

[0032] Next, the locking member 4 is placed in the caster arrangement portion 22 of the base 2, and as shown in FIGS. 7B and 8A, the insertion portion 411 of the insertion piece 41 is inserted into the insertion gap 20 from the front. In this embodiment, because the outer peripheral rib 23 is formed on the underside of the base 2, the insertion portion 411 cannot be inserted horizontally along the underside of the base 2 into the insertion gap 20. For this reason, the locking member 4 is moved diagonally upward and rearward from below the outer peripheral rib 23 to insert the insertion portion 411 into the insertion gap 20, but the rear end of the insertion portion 411 comes into contact with the underside of the base 2 and cannot be inserted any further. Then, the insertion piece 41 is bent, and the insertion portion 411 is moved further rearward, and the locking piece 431 engages with the peripheral edge of the elastic piece insertion hole 26 of the mounting rib 25 (see FIG. 8B), completing the installation. At this time, the base portion restricting rib 28 is inserted into the notch 424 formed in the second connecting piece 422, thereby avoiding interference between the base portion restricting rib 28 and the second connecting piece 422. Furthermore, since the cross section of the insertion portion 411 is formed in an L-shape (see FIG. 5B), the insertion portion 411 is more easily deflected than when the cross section of the insertion portion 411 is formed in a U-shape.

[0033] 8A, in the attached state, the base portion 30 and the insertion portion 411 of the insertion piece 41 are inserted into the base portion 30 so that the insertion piece 41 is positioned immediately above the vertical regulation portion 21 and the base portion 30 is positioned immediately above the insertion piece 41. The rear end of the base portion 30 is in contact with the upper surface of the vertical regulation portion 21. In addition, in the front-rear direction (i.e., the direction in which the base portion 30 is inserted into the insertion gap 20), the vertical regulation portion 21 occupies approximately half of the base portion 30.

[0034] 7B, in the attached state, the vertical regulation portion 21 and the insertion piece 41 are respectively provided with an engaging portion and an engaged portion that engage with each other to regulate horizontal movement of the insertion piece 41 relative to the vertical regulation portion 21. In this embodiment, the engaging portion provided on the vertical regulation portion 21 of the base 2 is a notch 211. The engaged portion provided on the insertion piece 41 is a protrusion 414 that is inserted into the notch 211. Note that the engaging portion and the engaged portion engage with each other and are distinguished for convenience, but either may be the engaging portion. That is, the engaging portion may be the protrusion 414 and the engaged portion may be the notch 211.

[0035] Such cutouts 211 and protrusions 414 restrict left-right movement of the locking member 4. In addition, the cutouts 211 and protrusions 414 restrict rearward movement of the locking member 4. Furthermore, as shown in Fig. 8B, the locking pieces 431 engage with the peripheral edge of the elastic piece insertion holes 26 of the mounting rib 25, restricting forward movement of the locking member 4.

[0036] 8A, the insertion portion 411 is formed so that the thickness from top to bottom becomes thinner toward the rear and the spacing from top to bottom of the insertion gap 20 becomes shorter toward the rear, which makes it easy to press-fit the insertion portion 411 into the insertion gap 20. This fixes the base portion 30 and the insertion portion 411 within the insertion gap 20, restricting vertical movement of the base portion 30 and the insertion portion 411, and also restricting horizontal movement of the base portion 30 and the insertion portion 411 by frictional force.

[0037] In addition, in this embodiment, the locking member 4 is disposed inside the outer peripheral rib 23 of the base 2, so the locking member 4 does not protrude from the base 2 and is less likely to get caught on anything.

[0038] Furthermore, as shown in FIG. 8B, when the trolley 1 is used to transport a load, the elastic piece 43 receives a load from the mounting rib 25. However, as shown in FIG. 8C, by making the protruding piece 44 also receive the load from the mounting rib 25, the load is prevented from concentrating on the elastic piece 43, which would make the elastic piece 43 more susceptible to damage.

[0039] Next, a second embodiment will be described with reference to Figures 9A to 9C. The second embodiment is mostly the same as the first embodiment, so the description that overlaps with the first embodiment will be omitted.

[0040] In the first embodiment, the engaging portion provided on the vertical regulation portion 21 of the base portion 2 is the notch 211, and the engaged portion provided on the insertion piece 41 is the ridge 414 inserted into the notch 211.

[0041] In contrast to this, in the second embodiment, the engaging portion provided on the vertical regulation portion 21 of the base portion 2 is a through hole 212 that passes through the insertion piece 41 in the vertical direction, as shown in Figures 9B and 9C. Also, the engaged portion provided on the insertion piece 41 is a protrusion 415 that is formed to protrude downward from the lower surface of the insertion piece 41, as shown in Figure 9A. This makes it possible to form the engaging portion and the engaged portion with a simple configuration.

[0042] Next, a third embodiment will be described with reference to Figures 10A to 10C. Note that the third embodiment is mostly the same as the first embodiment, and therefore, explanations that overlap with the first embodiment will be omitted.

[0043] In the first embodiment, the engaging portion provided on the vertical regulation portion 21 of the base portion 2 is the notch 211, and the engaged portion provided on the insertion piece 41 is the ridge 414 inserted into the notch 211.

[0044] In contrast to this, in the third embodiment, the engaging portion provided on the vertical regulation portion 21 of the base 2 is a notch 213 formed in the reinforcing rib 24 adjacent to the vertical regulation portion 21, as shown in Fig. 10B. Moreover, the engaged portion provided on the insertion piece 41 is a protrusion 416 that protrudes laterally from the side surface of the insertion piece 41. In the third embodiment, as shown by the arrow in Fig. 10C, by pushing the protrusion 416 from the outside, the engagement of the protrusion 416 with the notch 213 is released, making it easier to remove the locking member 4.

[0045] Next, a fourth embodiment will be described with reference to Fig. 11A. The fourth embodiment is mostly the same as the first embodiment, and therefore, the description that overlaps with the first embodiment will be omitted.

[0046] In the first embodiment, the rear end of the insertion portion 411 does not reach the reinforcing rib 24 located at the rear end of the insertion gap 20. In contrast, in the fourth embodiment, the rear end 417 of the insertion portion 411 is fitted into the through hole 241 formed in the reinforcing rib 24 located at the rear end of the insertion gap 20. This makes it difficult for the locking member 4 to come out of the insertion gap 20.

[0047] Next, a fifth embodiment will be described with reference to Fig. 11B. The fifth embodiment is mostly the same as the first embodiment, and therefore, the description that overlaps with the first embodiment will be omitted.

[0048] In the first embodiment, the rear end of the insertion portion 411 does not come into contact with the reinforcing rib 24 located at the rear end of the insertion gap 20. In contrast, in the fourth embodiment, the rear end of the insertion portion 411 comes into contact with the reinforcing rib 24 located at the rear end of the insertion gap 20, and also comes into contact with the rear end of the base portion 30. This allows the vertical regulation portion 21 to be fully usable over its entire length in the front-rear direction.

[0049] Next, a modified example will be described.

[0050] The base portion 2 does not necessarily have to have the through-hole 200 that penetrates vertically.

[0051] The shape of the base 2 may be square in plan view, or may not be rectangular in plan view, and is not particularly limited. Furthermore, the shapes of the base 2 and the carriage 1 do not have to be symmetrical left to right or front to back. The size of the base 2 is not particularly limited.

[0052] The base 2 may be entirely made of resin, or the main part of the base 2 may be made of resin and the remaining part may be made of a material other than resin. Also, the entire base 2 may be made of a material other than resin, such as metal.

[0053] The peripheral rib 23 does not have to be continuous around the entire outer peripheral edge of the underside of the base 2, and there may be portions on the outer peripheral edge where the peripheral rib 23 is not formed. The ends of the reinforcing rib 24 do not have to be continuous with the peripheral rib 23, and the peripheral rib 23 and the reinforcing rib 24 do not have to be formed integrally. The base 2 does not have to have the peripheral rib 23 or the reinforcing rib 24.

[0054] The entire base 2 does not have to be formed as a single unit. For example, the base 2 may be formed by combining a plurality of side members and corner members that connect the plurality of side members.

[0055] The direction of the rotation axis of the wheel portion 31 of the caster portion 3 may not be changeable relative to the support portion 32. There are no particular limitations on the shape, size, thickness, etc. of the base portion 30. Furthermore, the rotation axis and rim of the base portion 30, wheel portion 31, and support portion 32 do not have to be made of metal. There are no particular limitations on the material of the caster portion 3. There are no particular limitations on the position at which the caster portion 3 is provided on the base portion 2 or the number of caster portions 3 provided.

[0056] There is no particular limitation on the number of insertion pieces 41 that one locking member 4 has. In addition, there is no particular limitation on the shape of the insertion pieces 41 and the overall shape of the locking member 4.

[0057] The locking member 4 does not have to have two connecting pieces 42, the first connecting piece 421 and the second connecting piece 422, but may have only one connecting piece 42. In addition, the locking member 4 does not have to have the connecting piece 42.

[0058] The material of the locking member 4 is preferably resin, but is not limited to resin. The locking member 4 may be formed mainly from resin and may also contain materials other than resin.

[0059] When the locking member 4 is inserted into the insertion gap 20, the locking member 4 (particularly the insertion portion 411) may be configured to be inserted into the insertion gap 20 without being deflected.

[0060] In the attached state, the proportion of the base portion 30 that the vertical regulation portion 21 occupies in the front-rear direction is preferably any value in the range of 30% to 70%, such as 1 / 3 or 2 / 3, but is not limited to these values.

[0061] As is clear from the above-described embodiments and modifications, the dolly 1 of the first aspect comprises a base 2, caster units 3 attached to the underside of the base 2, and a locking member 4 for fixing the caster units 3 to the base 2. The caster units 3 have wheel units 31 and a base unit 30 supported by the wheel units 31 and attached to the underside of the base 2. The locking member 4 has an insertion piece 41. The base 2 has a vertical regulation unit 21 located below and spaced apart from the underside, and an insertion gap 20 between the underside and the vertical regulation unit 21, into which the base unit 30 and the insertion piece 41 are inserted. The base unit 30 and the insertion piece 41 are inserted into the insertion gap 20 so that the insertion piece 41 is located above the vertical regulation unit 21 and the base unit 30 is located above the insertion piece 41. The vertical regulation portion 21 and the insertion piece 41 are provided with one and the other of an engaging portion and an engaged portion that engage with each other to regulate horizontal movement of the insertion piece 41 relative to the vertical regulation portion 21.

[0062] According to the first aspect, horizontal movement of the locking member 4 is restricted, and no bolts and nuts are required to attach the caster portion 3 to the base portion 2, making the assembly work of the trolley 1 easier and preventing an increase in the weight of the trolley 1.

[0063] The second aspect can be realized by combining the first aspect. In the second aspect, the engaging portion provided on the vertical regulation portion 21 of the base portion 2 is a notch 211. The engaged portion provided on the insertion piece 41 is a protrusion 414 inserted into the notch 211.

[0064] According to the second aspect, the engaging portion and the engaged portion can be configured with a simple structure.

[0065] The third aspect can be realized by combining the first or second aspect. In the third aspect, the base 2 has a peripheral rib 23 that protrudes downward from the outer peripheral edge of the lower surface. The locking member 4 is disposed inside the peripheral rib 23 of the base 2.

[0066] According to the third aspect, the locking member 4 does not protrude from the base portion 2, and it is difficult for something to get caught on the locking member 4. [Explanation of symbols]

[0067] 1 cart 2 base 20 Insertion gap 200 Penetration 21 Vertical regulation part 211 Notch 212 Through hole 213 Notch 22 Caster placement area 23 Peripheral rib 24 Reinforcing rib 241 Through hole 25 Mounting rib 26 Elastic piece insertion hole 27 Projection piece insertion hole 28 Base control rib 281 Base regulation part 282 Slope 3 Caster part 30 Base 31 Wheel section 32 Support part 4 Locking member 41 Insert 411 Insertion part 412 Non-insertion part 413 Partition Wall 414 Projection 415 Protrusion 416 Protrusion 417 Rear end 42 Connecting piece 421 1st connection piece 422 2nd connection piece 423 Notch 424 Notch 425 Reinforcing rib 43 Elastic piece 431 Locking piece 44 Projecting piece 45 Reinforcing rib

Claims

1. A dolly comprising a base portion, a caster portion attached to a lower surface of the base portion, and a locking member for fixing the caster portion to the base portion, The caster unit has a wheel unit and a base unit supported by the wheel unit and attached to the underside of the base unit, The locking member has an insert piece, the base portion has a vertical regulation portion located below and spaced apart from the lower surface, and an insertion gap between the lower surface and the vertical regulation portion into which the base portion and the insertion piece are inserted, the base portion and the insertion piece are inserted into the insertion gap such that the insertion piece is positioned above the vertical regulation portion and the base portion is positioned above the insertion piece, The vertical regulation portion and the insertion piece are provided with one and the other of an engaging portion and an engaged portion that engage with each other to regulate horizontal movement of the insertion piece relative to the vertical regulation portion. A bogie characterized by:

2. the engaging portion provided on the vertical regulation portion of the base portion is a notch, The engaged portion provided on the insertion piece is a protrusion that is inserted into the notch.

2. The truck according to claim 1.

3. the base portion has an outer peripheral rib that protrudes downward from the outer peripheral edge of the lower surface, The locking member is disposed inside the outer peripheral rib of the base portion.

3. The bogie according to claim 1 or 2.

Images