Trolley

Abstract

To provide a truck having the degree of flexibility in selecting a material of a base.SOLUTION: A truck 1 includes a caster 30, a screw 5, and a conductive member 6. The caster 30 has conductivity and supports a base 2. The screw 5 has conductivity and fixes the caster 30 to the base 2. The conductive member 6 has conductivity and is electrically connected to the caster 30 through the screw 5. The conductive member 6 is exposed on the base 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a dolly. [Background technology]

[0002] Patent Document 1 discloses an electrostatic dissipative cart for transporting devices (e.g., microchips, circuit boards, and related elements) that are susceptible to damage by static electricity. The electrostatic dissipative cart has a cart body and a rotating member that supports the cart body. The cart body is formed using an electrostatic dissipative material to facilitate dissipation of electrostatic charges. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-182582 A Summary of the Invention [Problem to be solved by the invention]

[0004] The cart body of the above-mentioned electrostatic dissipative cart must be made of electrostatic dissipative material, and the freedom in selecting the material for the cart body is not high.

[0005] The present disclosure has been made in consideration of the above-mentioned reasons, and aims to provide a cart that allows for a high degree of freedom in selecting the base material. [Means for solving the problem]

[0006] A cart according to one embodiment of the present disclosure comprises a base, conductive casters supporting the base, conductive screws fixing the casters to the base, and conductive members exposed on the base, electrically connected to the casters via the screws.

[0007] A cart according to another aspect of the present disclosure includes a base, casters that are conductive and fixed to the base to support the base, a conductive member that is conductive and exposed on the base, and a connecting member that electrically connects the casters and the conductive member.

[0008] A cart according to yet another embodiment of the present disclosure comprises a base made of synthetic resin, conductive casters supporting the base, and a conductive member integrally molded with the base, conductive, electrically connected to the casters, and exposed on the base. Effect of the Invention

[0009] A cart according to one aspect of the present disclosure allows for greater freedom in the selection of materials for the base. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a dolly according to one embodiment of the present disclosure. [Diagram 2] FIG. 2 is a perspective view of the base and a plurality of casters of the dolly. [Diagram 3] FIG. 3A is a perspective view of a caster provided on the dolly, and FIG. 3B is another perspective view of the caster. [Figure 4] FIG. 4 is a cross-sectional view showing a schematic view of a part of the above-mentioned carriage. [Diagram 5] FIG. 5 is a cross-sectional view that shows a schematic view of a part of the carriage of the first modified example. [Figure 6] FIG. 6 is a perspective view of the carriage of the second modification. [Figure 7] FIG. 7 is a perspective view of a carriage according to the third modification. [Figure 8] FIG. 8 is a cross-sectional view that shows a schematic view of a part of a carriage according to the fourth modification. [Figure 9] FIG. 9 is a perspective view of the above dolly. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present disclosure relates to a carriage, and more particularly to a carriage having electrical conductivity.

[0012] (1) Implementation form Fig. 1 shows a dolly 1 of this embodiment. In this disclosure, unless otherwise specified, the dolly 1 will be described using directions when the dolly 1 is placed on a horizontal ground surface (running surface) 9. Specifically, as shown in Fig. 1, the vertical direction is defined as downward, the direction that is set in design as the direction in which the dolly 1 moves straight ahead is defined as forward, and the left and right directions are defined based on the dolly 1 as viewed from the front.

[0013] The dolly 1 is a transport dolly used for manually transporting an object, and includes a platform 2 for supporting the object, and a number of casters 3 for supporting the platform 2. The dolly 1 moves along the contact surface 9 as the wheels 31 of each caster 3 rotate along the contact surface 9. The contact surface 9 is, for example, a floor or the ground.

[0014] The platform 2 is rectangular when viewed from above, and is formed in a plate shape with the thickness direction parallel to the vertical direction. The platform 2 of this embodiment is formed in a rectangular shape with the dimension in the front-to-back direction longer than the dimension in the left-to-right direction when viewed from above. The shape of the platform 2 is not limited, and may be formed in a rectangular frame shape when viewed from above, for example, like the platform of an angle carrier.

[0015] The base 2 is made of synthetic resin and is an insulator. The base 2 is formed of, for example, a hard synthetic resin such as polypropylene. The material of the base 2 is not limited.

[0016] 2, the base 2 has a base plate portion 20, a peripheral rib 21, and a reinforcing rib 22. The base plate portion 20 forms the upper end portion of the base 2, and the upper surface of the base plate portion 20 forms the upper surface of the base 2. The upper surface of the base plate portion 20 is a substantially horizontal surface.

[0017] The outer peripheral rib 21 protrudes downward from the outer peripheral edge of the base plate portion 20. The outer peripheral rib 21 is formed integrally with the base plate portion 20. The outer peripheral rib 21 is formed around the entire circumference of the base plate portion 20, and is formed in a continuous ring shape when viewed from below.

[0018] The reinforcing rib 22 is located inside the annular outer peripheral rib 21 and protrudes downward from the base plate portion 20. The reinforcing rib 22 is formed integrally with the base plate portion 20. The reinforcing rib 22 is a lattice-shaped rib when viewed from below, and has a plurality of vertical ribs 220 and a plurality of horizontal ribs 221. Each vertical rib 220 is formed in a plate shape extending in the front-rear direction with its thickness direction parallel to the left-right direction. Each horizontal rib 221 is formed in a plate shape extending in the left-right direction with its thickness direction parallel to the front-rear direction, and intersects with the plurality of vertical ribs 220.

[0019] The dolly 1 is a push dolly, and further includes a handle 4 for pushing the dolly by hand, as shown in FIG. 1. The handle 4 protrudes upward from the rear end of the platform 2. The handle 4 is, for example, a U-shaped metal pipe. A user of the dolly 1 can move the dolly 1 along the ground surface 9 by grasping the upper end of the handle 4 and moving it. The shape, size, material, etc. of the handle 4 are not limited. The dolly 1 does not have to include the handle 4. That is, the dolly 1 may be, for example, a flat dolly without the handle 4. The dolly 1 is not limited to a push dolly, and may be an angle carry, a pull dolly, or the like.

[0020] 2, a plurality of casters 3 are attached to the underside of the base 2. The dolly 1 of this embodiment has four casters 3 as the plurality of casters 3. The four casters 3 are attached to the four corners of the rectangular base 2, respectively.

[0021] Each caster 3 is a swivel caster in which the direction of the rotation axis of the wheel 31 of the caster 3 can be changed. Each caster 3 may be a fixed caster in which the direction of the rotation axis of the wheel 31 cannot be changed. The multiple casters 3 may include swivel casters and fixed casters. For example, the two front casters 3 may be swivel casters and the two rear casters 3 may be fixed casters. The number of casters 3 of the cart 1 is not limited and may be less than four or may be five or more.

[0022] The multiple casters 3 include conductive casters 30 having electrical conductivity. The cart 1 includes, for example, only one or two conductive casters 30, and the casters 3 other than the conductive caster 30 among the multiple casters 3 are non-conductive casters having lower electrical conductivity than the conductive caster 30. In other words, the multiple casters 3 include conductive casters 30 and non-conductive casters.

[0023] The location where the conductive caster 30 is attached to the trolley 1 is not limited. For example, the caster 3 attached to the front corner of the trolley 1 may be the conductive caster 30, or the caster 3 attached to the rear corner of the trolley 1 may be the conductive caster 30. The number of conductive casters 30 provided on the trolley 1 is not limited. For example, the trolley 1 may be provided with three or more conductive casters 30. Furthermore, the trolley 1 may be provided with only conductive casters 30 out of the conductive casters 30 and non-conductive casters.

[0024] 3, the conductive caster 30 has a wheel 31, a frame 32, and a mounting seat 33. The mounting seat 33 is a portion that is attached to the base 2. The frame 32 is attached to the mounting seat 33 so as to be rotatable about a rotation axis that is parallel to the up-down direction, and the wheel 31 is attached to the frame 32 so as to be rotatable about a rotation axis that is parallel to the horizontal direction.

[0025] Each of the wheel 31, the frame 32, and the mounting seat 33 is conductive. The mounting seat 33 is electrically connected to the ground surface 9 with which the wheel 31 is in contact via the frame 32 and the wheel 31. When the conductive caster 30 is a fixed caster, the mounting seat 33 is, for example, formed integrally with the frame 32, or is attached to the frame 32 so as to be non-rotatable.

[0026] The cart 1 is provided with a plurality of screws 5 (see FIG. 4). The mounting seat 33 of each conductive caster 30 is fixed to the base 2 by a plurality of screws (male screws) 5. The mounting seat 33 of each conductive caster 30 is fixed to the base 2 by a total of four screws 5. The screws 5 in this embodiment are bolts that fix an object using nuts 52. Note that "screws" in this disclosure include bolts and screws. Furthermore, the number of screws 5 provided on the cart 1 is not limited.

[0027] The mounting seat 33 is made of, for example, metal. The material of the mounting seat 33 may be made of a material other than metal as long as it is conductive. The mounting seat 33 is rectangular when viewed in the vertical direction and is formed in a plate shape with a thickness direction parallel to the vertical direction. The mounting seat 33 has a plurality of screw holes 330 corresponding to the plurality of screws 5. The mounting seat 33 of this embodiment has four screw holes 330 formed at the four corners of the rectangular plate-shaped mounting seat 33 as the plurality of screw holes 330. Each screw hole 330 penetrates the mounting seat 33 in the vertical direction.

[0028] 4, the base plate portion 20 of the base 2 has a plurality of through holes 200 corresponding to the plurality of screw holes 330, respectively. A screw 5 passes through each of the through holes 200. Each screw 5 is screwed into the corresponding screw hole 330 of the mounting seat 33. Each screw 5 is made of metal and is conductive.

[0029] Each through hole 200 is a countersunk hole and has a countersunk 201 at its upper end. The inner diameter of the countersunk 201 is larger than the inner diameter of a portion of the through hole 200 below the countersunk 201. The head 50 of each screw 5 is housed in the countersunk 201 of the corresponding through hole 200. The upper surface of the head 50 of each screw 5 is flush with the upper surface of the base plate portion 20 and is exposed above the base plate portion 20.

[0030] It should be noted that the through hole 200 is not limited to a countersunk hole, and may be a hole without the countersunk hole 201. The screw 5 may be a bolt that fixes an object without using a nut. In this case, the screw hole 330 is a threaded hole with a female thread formed on the inner circumferential surface, and the screw 5 is screwed into the screw hole 330. The screw 5 may be a screw other than a bolt, such as a screw. The number of the screw holes 330 that the mounting seat 33 has is not limited. The shape of the mounting seat 33 is also not limited.

[0031] The frame 32 is made of, for example, a metal. The frame 32 may be made of a material other than a metal as long as the material has electrical conductivity. As shown in FIG. 3, the frame 32 has a connecting portion 320 and a supporting portion 321. The connecting portion 320 is connected to the mounting seat 33 so as to be rotatable about a rotation axis parallel to the vertical direction. The supporting portion 321 is connected to the connecting portion 320. The supporting portion 321 supports the wheel 31 so as to be rotatable about a horizontal rotation axis. The frame 32 rotates about the rotation axis parallel to the vertical direction relative to the mounting seat 33, thereby changing the orientation of the rotation axis of the wheel 31.

[0032] The material of the wheels 31 is, for example, conductive rubber, metal, or a combination of conductive rubber and metal, etc. There is no limitation on the material of the wheels 31. The wheels 31 are attached to the frame 32 so as to be rotatable around a horizontal rotation axis.

[0033] In addition, the non-conductive caster may be any caster that does not have conductivity, and may be a caster having a similar configuration to the conductive caster 30 except that it is made of a conductive material, or may be a well-known non-conductive caster.

[0034] As shown in FIG. 1, the cart 1 further includes a conductive member 6. The conductive member 6 is conductive and exposed on the platform 2. The conductive member 6 in this embodiment is a flat conductive mat laid on the platform 2. The conductive member 6 is formed of, for example, conductive rubber. The material of the conductive member 6 is not limited as long as it is a conductive material, and may be, for example, a resin containing a conductive material, a metal, or the like. The conductive member 6 may be a conductive sheet or a conductive film.

[0035] When viewed from above, the conductive member 6 is formed in a rectangular shape that is slightly smaller than the base plate portion 20 and whose front-to-rear dimension is longer than its left-to-right dimension. The conductive member 6 is placed on the base plate portion 20 with its lower surface aligned with the upper surface of the base plate portion 20. When viewed from above, the outer periphery of the conductive member 6 is located inside the outer periphery of the base plate portion 20 and does not protrude outside the base plate portion 20. The conductive member 6 covers more than half of the upper surface of the base plate portion 20. The size and shape of the conductive member 6 are not limited.

[0036] As shown in FIG. 4, the underside of a portion of the conductive member 6 is placed on the base plate portion 20 in contact with the upper end of the head 50 of the screw 5 for fixing the conductive caster 30 to the base 2.

[0037] The conductive member 6 is electrically connected to the mounting seat 33 of the conductive caster 30 via the screw 5. That is, the conductive member 6 is electrically connected to the conductive caster 30 via the screw 5. Therefore, the conductive member 6 is electrically connected to the ground surface 9 with which the wheel 31 of the conductive caster 30 comes into contact via the screw 5 and the conductive caster 30, as shown by the arrow in Fig. 4. That is, the conductive member 6 is electrically connected to the ground surface 9 via the screw 5, the mounting seat 33 of the conductive caster 30, the frame 32, and the wheel 31.

[0038] In this embodiment, the upper surface of the head 50 of each screw 5 is flush with the upper surface of the base plate portion 20, but the head 50 of each screw 5 may protrude above the upper surface of the base plate portion 20. In this way, the head 50 of each screw 5 is caused to bite into and contact the conductive member 6, and electrical connection between each screw 5 and the conductive member 6 can be reliably established. In this case, the head 5 of each screw 5 protrudes, for example, 0.5 mm above the upper surface of the base plate portion 20. The amount of protrusion of the head 5 of each screw 5 above the upper surface of the base plate portion 20 is not limited.

[0039] In addition, in the present disclosure, "electrically connected" means a state in which members are connected to each other directly or via other members so that electricity can flow, and does not mean a state in which a current always flows. In addition, the conductive member 6 may contact a plurality of screws 5 for fixing any one conductive caster 30 to the base 2, or may contact only one screw 5 out of a plurality of screws 5 for fixing one conductive caster 30 to the base 2. In addition, when the dolly 1 has a plurality of conductive casters 30, the conductive member 6 may contact a screw 5 for fixing each conductive caster 30 to the base 2. In addition, the conductive member 6 is preferably installed on the base 2 in a state in which it is fixed to the base 2 using an adhesive, welding, a fixing tool, or the like, but may be installed on the base 2 without such fixing. The conductive member 6 may be installed, for example, by simply being placed on the base 2.

[0040] The transported object transported by the cart 1 is placed on the conductive member 6 and is supported by the platform 2 via the conductive member 6. In this case, the transported object comes into contact with the conductive member 6, and is electrically connected to the ground surface 9 via the conductive member 6, the screw 5, and the conductive caster 30. This makes it easier for the transported object to be discharged, and for example, the transported object is prevented from being charged and dust or dirt adheres to the transported object. In addition, in this case, the platform 2 can be formed from a material that does not have electrical conductivity, and the freedom of material selection for the platform 2 is high. For example, if the platform 2 is formed using an electrostatic dissipative material, as in the cart body of the electrostatic dissipative cart shown in Patent Document 1, it is difficult to increase the impact strength of the platform 2. However, in this embodiment, a material with high impact resistance can be used as the material of the platform 2, and the impact resistance of the cart 1 can be improved.

[0041] In addition, in order to conduct the conductive member 6 arranged on the platform 2 to the ground surface 9, it is possible to earth the platform 2 to the ground surface 9 via a ground chain, as in the electrostatic dissipation cart shown in Patent Document 1, for example. However, in this case, there is a concern that when a user moves the platform 1, the foot may get caught in the ground chain, the ground surface 9 may be damaged by the ground chain, or dirt, dust, etc. may adhere to the ground chain. However, in the platform 1 of this embodiment, the conductive member 6 can be conducted to the ground surface 9 via the conductive caster 30, so there is no need to provide a ground chain, and an increase in the number of parts of the platform 1 can be suppressed.

[0042] (2) Variations Next, modified examples of the above embodiment will be described. In the following description of each modified example, elements common to the above embodiment will be denoted by the same reference numerals, and duplicated description will be omitted.

[0043] (2-1) Variation 1 In the cart 1 of the first modification, the conductive member 6 and the conductive caster 30 are electrically connected by a conductive connecting member 7. Specifically, as shown in Fig. 5, the conductive caster 30 is attached to the base 2 by a mounting means other than a screw, and the conductive member 6 and the conductive caster 30 are electrically connected by the conductive connecting member 7 which is a member different from the screw for attaching the conductive caster 30 to the base 2.

[0044] The attachment means for attaching the conductive caster 30 to the base 2 is, for example, a recess 23 formed on the lower surface of the base 2 and into which the mounting seat 33 is fitted and fixed. In this case, the recess 23 may be formed with a hook portion that is hooked onto the mounting seat 33 and fixed. Also, the mounting seat 33 may be fixed to the recess 23 by inserting another member between the recess 23 and the mounting seat 33 like a wedge. Also, the attachment means is not limited to the recess 23, and may be, for example, an adhesive or the like.

[0045] The connection member 7 is a screw (more specifically, a bolt) attached to the base 2. However, this connection member 7 is not a screw for attaching the conductive caster 30 to the base 2. A screw hole 24 is formed in the base plate portion 20 of the base 2, penetrating in the vertical direction. The screw hole 24 is a countersunk hole having a counterbore 240 at the lower end, and a female thread is formed on the inner circumferential surface of the portion of the screw hole 24 located above the countersunk 240. The connection member 7, which is a screw, is attached to the base 2 by fitting the shaft portion 71 into the female thread of the screw hole 24 with the head portion 70 housed in the countersunk 240. The upper surface of the shaft portion 71 of the connection member 7 is flush with the upper surface of the base plate portion 20 and exposed above the base plate portion 20.

[0046] The lower surface of the conductive member 6 contacts the upper end of the shaft portion 71 of the connection member 7 attached to the base 2. The conductive member 6 is electrically connected to the mounting seat 33 of the conductive caster 30 via the connection member 7. Therefore, the conductive member 6 is electrically connected to the ground surface 9 with which the wheel 31 of the conductive caster 30 comes into contact, via the connection member 7 and the conductive caster 30.

[0047] In this modification, in a cart 1 in which the conductive caster 30 is attached to the base 2 by a mounting means other than a screw, the conductive member 6 can be made conductive to the ground surface 9 via the conductive caster 30.

[0048] In addition, the upper end surface of each connection member 7, which is a screw in this modification, is flush with the upper surface of the base plate portion 20, but the upper end of each connection member 7 may protrude above the upper surface of the base plate portion 20. In this way, each connection member 7 can be reliably contacted with the conductive member 6. In this case, the upper end of each connection member 7 is protruded, for example, 0.5 mm above the upper surface of the base plate portion 20. The protrusion amount of each connection member 7 protruding above the upper surface of the base plate portion 20 is not limited. In addition, the connection member 7 is not limited to a screw, and may be a member other than a screw as long as it is a conductive member. In addition, the connection member 7 may be a member integrally molded with the base 2, as in modification 4 described later. In addition, the connection member 7 is not limited to one composed of one member, and may be a plurality of members. For example, the connection member 7 may be a plurality of screws attached to the base 2, and the conductive member 6 and the conductive caster 30 may be electrically connected by the plurality of screws.

[0049] (2-2) Variation 2 The cart 1 of the second modification differs from the embodiment in the shape of the conductive member 6. As shown in FIG. 6, the conductive member 6 of this modification is a conductive net (mesh-like sheet). The conductive member 6 is formed, for example, from conductive rubber or the like. The material of the conductive member 6 is not limited as long as it is a material having conductivity, and may be, for example, a metal. The conductive member 6 may be a mesh-like conductive mat or a mesh-like conductive film.

[0050] The conductive member 6 has a plurality of linear portions 60 arranged at intervals in one direction when viewed from above, and a plurality of linear portions 61 arranged at intervals in a direction intersecting the one direction when viewed from above. The linear portions 60 and the linear portions 61 intersect and are connected to each other. Like the conductive member 6 of the embodiment, a portion of the conductive member 6 contacts the screw 5 for attaching the conductive caster 30 to the base 2, and is electrically connected to the conductive caster 30 via the screw 5.

[0051] The conductive member 6 may be electrically connected to the conductive caster 30 by a connecting member 7 having conductivity, which is a member different from the screw 5 for attaching the conductive caster 30 to the base 2, as in the first modification. In this case, the conductive caster 30 may be attached to the base 2 by an attachment means other than the screw 5, as in the first modification.

[0052] (2-3) Variation 3 The cart 1 of the third modification differs from the embodiment in the shape of the conductive member 6. As shown in Fig. 7, the conductive member 6 of this modification has a plurality of strip-shaped members 62, 63. Each of the strip-shaped members 62, 63 is formed of, for example, conductive rubber. The material of the conductive member 6 is not limited as long as it is a material having conductivity, and may be, for example, a metal.

[0053] The conductive member 6 has a strip-shaped member 62 and a plurality of strip-shaped members 63 as a plurality of strip-shaped members. The strip-shaped member 62 is provided on the upper surface of the rear end of the base plate portion 20. The strip-shaped member 62 extends in the left-right direction. The plurality of strip-shaped members 63 are arranged at intervals in the left-right direction. Each of the plurality of strip-shaped members 63 extends in the front-rear direction. The rear end of each strip-shaped member 63 is in contact with the strip-shaped member 62 or located in the vicinity of the strip-shaped member 62. The shape and size of each strip-shaped member 62, 63, the number of strip-shaped members 62, 63 included in the conductive member 6, and the positions of each strip-shaped member 62, 63 are not limited.

[0054] A portion of the conductive member 6 is in contact with the screw 5 for attaching the conductive caster 30 to the base 2 , similar to the conductive member 6 in the embodiment, and is electrically connected to the conductive caster 30 via the screw 5 .

[0055] The strip-shaped members 62, 63 may be integrally formed. The conductive member 6 may be electrically connected to the conductive caster 30 by a connecting member 7 having conductivity, which is a separate member from the screw 5 for attaching the conductive caster 30 to the base 2, as in the first modification. In this case, the conductive caster 30 may be attached to the base 2 by a mounting means other than the screw, as in the first modification.

[0056] (2-4) Variation 4 In the trolley 1 of the fourth modification shown in Fig. 8 and Fig. 9, the conductive member 6 is integrally molded with the base 2. The conductive member 6 has a plurality of conductive parts 64. In the trolley 1 of this modification, all of the four casters 3 are conductive casters 30, and the conductive member 6 has four conductive parts 64 corresponding to the four conductive casters 30, respectively. Each conductive part 64 is a part of the base 2 that corresponds to the mounting seat 33 of the corresponding conductive caster 30.

[0057] Each conductive portion 64 is formed, for example, from conductive rubber or the like, and is molded integrally with the base 2 by two-color molding. The upper surface of each conductive portion 64 is flush with the upper surface of the base plate portion 20 and is exposed above the base 2. For example, each conductive portion 64 is formed in a band shape extending horizontally in one direction. The lower surface of each conductive portion 64 is exposed below the base 2.

[0058] Each conductive caster 30 is attached to the base 2 with the upper surface of the mounting seat 33 in contact with the lower surface of the corresponding conductive portion 64. As in the first modified example, each conductive caster 30 is attached to the base 2 by a mounting means other than a screw. Note that each conductive caster 30 may be attached to the base 2 by a screw 5, as in the embodiment.

[0059] The cart 1 of this modified example can be easily manufactured by integrally molding the conductive member 6 with the base 2. Note that the carts 1 of the above embodiment and modified examples 1 to 3 have the advantage that the conductive member 6 can be reused when the cart 1 is disposed of.

[0060] In addition, the upper surface of each conductive part 6 in this modification is flush with the upper surface of the base plate part 20, but the upper end part of each conductive part 6 (the upper end part of the conductive member 6) may protrude above the upper surface of the base plate part 20. In this way, the conductive member 6 can be reliably brought into contact with the transported object on the base 2. In this case, the upper end part of each conductive part 6 is protruded, for example, 0.5 mm above the upper surface of the base plate part 20. The protrusion amount of each conductive part 6 protruding above the upper surface of the base plate part 20 is not limited. In addition, the conductive caster 30 in this modification is directly in contact with the conductive part 64 and is electrically connected to the conductive part 64, but for example, as in the embodiment, it may be electrically connected to the conductive part 64 via the screw 5 that fixes the conductive caster 30 to the base 2. In addition, the conductive caster 30 in this modification may be electrically connected to the conductive part 64 via the connection member 7 as in the modification 1. In addition, the shape and size of each conductive part 64 in this modification and the number of conductive parts 64 that the conductive member 6 has are not limited. Furthermore, the material of the conductive portion 64 is not limited as long as it is conductive, and may be, for example, a metal.

[0061] (3) Description As is clear from the above-described embodiment, variant 2 and variant 3, the trolley 1 of the first aspect has the following configuration. The trolley 1 includes casters (conductive casters) 30, screws 5 and conductive members 6. The casters 30 are conductive and support the base 2. The screws 5 are conductive and fix the casters 30 to the base 2. The conductive members 6 are conductive and are electrically connected to the casters 30 via the screws 5. The conductive members 6 are exposed on the base 2.

[0062] According to this embodiment, an object transported by the cart 1 comes into contact with the conductive member 6, and is electrically connected to the ground surface 9 via the conductive member 6, the screw 5, and the caster 30. This makes it easier for the object to be discharged, and for example, prevents the object from becoming electrically charged and causing dust and dirt to adhere to the object. In addition, the platform 2 can be made of a material that is not conductive, and there is a high degree of freedom in the selection of the material for the platform 2.

[0063] As is clear from the above-mentioned Modifications 1 to 3, the trolley 1 of the second aspect has the following configuration. The trolley 1 includes a base 2, casters 30, conductive members 6, and a connecting member 7. The casters 30 are conductive and are fixed to the base 2 to support the base 2. The conductive members 6 are conductive and are exposed on the base 2. The connecting member 7 electrically connects the casters 30 and the conductive members 6.

[0064] According to this embodiment, an object transported by the cart 1 comes into contact with the conductive member 6, and is electrically connected to the ground surface 9 via the conductive member 6, the connection member 7, and the conductive caster 30. This makes it easier for the object to be discharged. In this case, the platform 2 can be made of a material that is not conductive, and there is a high degree of freedom in selecting the material for the platform 2.

[0065] As is clear from the above-mentioned fourth modification, the trolley 1 of the third aspect has the following configuration. The trolley 1 includes a base 2, casters 30, and a conductive member 6. The base 2 is made of synthetic resin. The casters 30 are conductive and support the base 2. The conductive member 6 is integrally molded with the base 2, is conductive, is electrically connected to the casters 30, and is exposed on the base 2.

[0066] According to this embodiment, an object transported by the cart 1 comes into contact with the conductive member 6, and is electrically connected to the ground surface 9 via the conductive part 64 and the conductive caster 30. This makes it easier for the object to be discharged. In this case, the platform 2 can be made of a synthetic resin material that is not conductive.

[0067] The cart 1 of the fourth aspect can be realized by combining with any one of the aspects 1 to 3. The cart 1 of the fourth aspect includes only one or two conductive casters 30 (conductive casters).

[0068] According to this embodiment, an increase in the number of conductive casters 30 can be suppressed. [Explanation of symbols]

[0069] 1 Cart 2 units 30 Casters (conductive casters) 5 Screws 6 Conductive materials 7 Connection parts

Claims

1. A synthetic resin base; four conductive casters attached to a bottom surface of the platform to support the platform; a screw having electrical conductivity and fixing the caster to the base; a conductive member that is conductive, electrically connected to the caster via the screw, and exposed on the base; The base includes a base plate portion, an annular outer peripheral rib formed integrally with the base plate portion so as to protrude downward from an outer peripheral edge portion of the base plate portion, and a lattice-shaped reinforcing rib located inside the outer peripheral rib and formed integrally with the base plate portion so as to protrude downward from the base plate portion, The caster has a wheel, a frame, and a metal mounting seat, A recess for fixing the mounting seat is provided on the lower surface of the base, A through hole for passing the screw is formed in the base plate portion within a range in which the mounting seat is located in a plan view. Trolley.

2. A base made of synthetic resin; four conductive casters attached to a bottom surface of the platform to support the platform; A conductive member having electrical conductivity and exposed on the base; a connecting member that electrically connects the caster and the conductive member, The base includes a base plate portion, an annular outer peripheral rib formed integrally with the base plate portion so as to protrude downward from an outer peripheral edge portion of the base plate portion, and a lattice-shaped reinforcing rib located inside the outer peripheral rib and formed integrally with the base plate portion so as to protrude downward from the base plate portion, The caster has a wheel, a frame, and a metal mounting seat, A recess having a hook portion for fixing the mounting seat is provided on the lower surface of the base, A through hole for accommodating the connection member is formed in the base plate portion within a range in which the mounting seat is located in a plan view. Trolley.

3. A synthetic resin base and four conductive casters attached to a bottom surface of the platform to support the platform; a conductive member that is integrally formed with the base, has electrical conductivity, is electrically connected to the casters, and is exposed on the base; The base includes a base plate portion, an annular outer peripheral rib formed integrally with the base plate portion so as to protrude downward from an outer peripheral edge portion of the base plate portion, and a lattice-shaped reinforcing rib located inside the outer peripheral rib and formed integrally with the base plate portion so as to protrude downward from the base plate portion, The caster has a wheel, a frame, and a metal mounting seat, A recess for fixing the mounting seat is provided on the lower surface of the base, The conductive member is integrally molded with the base by two-color molding. Trolley.

4. The upper surface of the head of the screw is flush with the upper surface of the base plate or protrudes from the upper surface of the base plate. The dolly of claim 1.

5. A wedge is inserted between the recess and the mounting seat. The dolly of claim 2.

6. An upper end of the conductive member protrudes above an upper surface of the base plate portion. The dolly of claim 3.

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