JPH0731545U - Mobile cart for hanger rails - Google Patents

Abstract

(57) [Summary] [Purpose] In a hanger rail moving carriage that can be moved along a hanger rail while suspending a transported object, it is possible to move with a small driving force and to reduce noise during movement. To do. [Structure] By providing a guide roller 30 rotatably around a substantially vertical axis via a hexagonal bolt 40 or the like on an arm portion 26d protruding laterally from a main body portion 26c of a main body frame 26, a hanger rail moving carriage. When the body frame 26 laterally shakes due to the operating force applied to the guide roller 30, the guide roller 30 comes into contact with the outer surface of the side wall portion 24 of the hanger rail 12 to limit the lateral shake, and the wheel 2
A gap is secured between 8 and the inner surface of the side wall 24.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a moving carriage for a hanger rail that can be moved while being guided by a hanger rail in a suspended state, and more particularly to a moving carriage that has a small noise and can be smoothly moved with a small driving force. is there.

[0002]

[Prior art]

 For example, when a relatively heavy object is to be transported along a predetermined route, a movable carriage is movably arranged on a hanger rail installed above the route in advance, and the transported carriage is transported to the movable carriage. It is carried out at various work sites to suspend and transport the objects. As a hanger rail used in such a hanger rail type moving facility, a hanger rail having a substantially rectangular frame shape in cross section and an opening provided at the center of a substantially horizontal lower base part, It is widely known that the robot has a substantially I-shape, and a moving carriage having a structure corresponding to those hanger rails is used, and a worker manually pushes or pulls a suspended object to be transported. Alternatively, it can be moved along with the transported object along the hanger rail by a driving means such as an electric motor. That is, for the former hanger rail having a substantially rectangular frame shape in cross section, a moving carriage having a plurality of wheels mounted on the lower base portion on both sides of the opening is used. By contacting the side wall of the hanger rail, the lateral runout is restricted and the hanger rail can be moved along the hanger rail. In addition, for the latter hanger rail whose cross section is substantially I-shaped, there is a moving carriage having a plurality of wheels mounted on a pair of substantially horizontal flanges below the hanger rail. A large-diameter flange part that is provided integrally with the wheel is brought into contact with the outer end part of the flange part so that it can be moved along the hanger rail with lateral shake limited. ing.

[0003]

However, in each of the conventional trolleys for hanger rails, running resistance is large and a large driving force is required to move the dolly, and a relatively large noise is generated during movement. There was a problem that it occurred. That is, since the wheels of the moving carriage are made of metal, the weight of the wheels is heavy, and since the wheels move while the side surfaces and flanges of the wheels are in contact with the hanger rails, sliding resistance occurs and the wheels cannot be moved. A large driving force is required, and a large rolling noise and unpleasant sliding contact noise are generated due to the contact between metals. In addition, in a moving carriage used for a hanger rail having an I-shaped cross section, the collar portion that abuts the outer end of the flange portion is rotated together with the wheel, but the wheel rolling on the flange portion and the outer portion of the flange portion The radius of contact is different from that of the collar that contacts the end, and the collar makes sliding contact with the wheel that makes rolling contact, so the side surface of the wheel slides as if it slidably contacts the hanger rail. Produces resistance and sliding noise.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a moving carriage for a hanger rail that can be smoothly moved by a small driving force and has a small noise. .

[0005]

[Means for Solving the Problem] A first invention for achieving the above object is to provide an opening in the center of a lower base portion which is substantially horizontal and has a substantially rectangular frame shape in cross section. A moving carriage for a hanger rail, which is disposed on a hanger rail and can be moved in the longitudinal direction of the hanger rail in a state where the carried object is suspended, comprising: (a) a hanging means for suspending the carried object. A main body frame, and (b) is rotatably arranged around a substantially horizontal axis through a bearing on an upper end portion of the main body frame, and is placed on the lower base portion on both sides of the opening. A plurality of wheels that are made to roll on the lower base portion while supporting the main body frame and at least the outer peripheral portion of which is in contact with the lower base portion is made of synthetic resin; and (c) the book. The frame extends downward from the opening and protrudes to the outside of the pair of substantially vertical side walls on both sides of the hanger rail, and is rotatably disposed around a substantially vertical axis through bearings. A plurality of guide rollers that limit lateral vibration of the main body frame to secure a gap between the wheel and the pair of side wall portions by being brought into contact with the outer surfaces of the pair of side wall portions, respectively. It is characterized by having.

[0006]

[Operation and Effect of First Invention] In such a hanger rail moving carriage, a plurality of guide rollers are rotatably provided on the outer side of a pair of substantially vertical side walls on both sides of the hanger rail so as to be rotatable about a substantially vertical axis. Since the guide roller abuts against the side wall of the hanger rail, lateral vibration is limited and a gap is secured between the wheel and the side wall, so that The occurrence of sliding resistance and sliding contact noise due to sliding contact with the hanger rail is prevented. The guide roller is attached via a bearing and makes rolling contact with the side wall of the hanger rail, so running resistance and abnormal noise due to the contact are relatively small. In addition, since the outer circumference of at least the lower base of the hanger rail of a plurality of wheels is made of synthetic resin, the rolling contact between the metal and resin reduces noise during movement, and the moving carriage is It becomes lighter in weight and requires less driving force.

[0007]

A second aspect of the present invention is to arrange a hanger rail having a substantially I-shaped transverse cross section, and to suspend the length of the hanger rail with the object to be transported suspended. A moving carriage for a hanger rail that can be moved in any direction, comprising: (d) a main body frame having a hooking means for suspending the object to be conveyed; and (e) a substantially horizontal surface via bearings at the upper end of the main body frame. Are rotatably mounted around a pair of substantially horizontal flanges on the lower side of the hanger rail, and roll on the flanges while supporting the body frame. And a plurality of wheels each having at least an outer peripheral portion which is in contact with the flange portion and is made of a synthetic resin, and (f) a phase around the same shaft center via a bearing on the outside of each of the wheels. The contact surfaces that are rotatably arranged and have a substantially conical shape are brought into contact with the outer ends of the flange portions, respectively, to limit the lateral shake of the main body frame and thereby to vertically adjust the wheels and the hanger rails. And a plurality of guide rollers that secure a gap between the guide roller and the section.

[0008]

[Operation and Effect of the Second Invention] In such a hanger rail moving carriage, guide rollers are concentrically and relatively rotatably arranged on the outside of each wheel, and the contact surface of the hanger has a substantially conical shape. By abutting the outer ends of the pair of flanges of the rail, lateral runout is limited, and a gap is secured between the wheel inside the guide roller and the vertical part of the hanger rail. It is possible to prevent the generation of sliding resistance and sliding contact noise due to the sliding contact between the side surface of the wheel and the hanger rail. In particular, since the contact surface of the guide roller has a substantially conical shape, the contact area with the outer end of the flange is small, and sliding resistance and sliding contact noise between them are well avoided. It In addition, since at least the outer periphery of the wheels that come into contact with the flange of the hanger rail is made of synthetic resin, rolling contact between the metal and resin reduces noise during movement and the weight of the mobile carriage is low. Therefore, the driving force can be further reduced.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a hanger rail moving carriage (hereinafter, simply referred to as a moving carriage) 10 according to an embodiment of the first invention, in which a transported object 14 is mounted on a moving carriage 10 arranged on a hanger rail 12. Shown in a suspended state. 2 and 3 are a cross-sectional view taken along the line II-II in the center of the bogie of FIG. 1 and a plan view of a part of the hanger rail 12 cut away and seen from above. As can be seen from the above figures, the hanger rail 12 has a rectangular frame shape in a cross section perpendicular to the longitudinal direction, and has an opening 18 at the center of a horizontal lower base portion 16. The hanger rail 12 is connected to a support member (not shown) at each position separated by a predetermined distance in the longitudinal direction via the upper base portion 22 and the side wall portions 24 on both sides which form the rectangular frame shape. As a result, the object to be transported 14 is erected at a predetermined height position on a predetermined transport path to be transported. The hanger rail 12 is manufactured, for example, from a strip-shaped steel plate by roll forming, and a flange for improving the strength as a beam member is provided at the ends of the pair of lower base portions 16 on the opening 18 side. The portion 20 is formed so as to project upward.

The movable carriage 10 includes a main body frame 26 which is positioned parallel to the opening 18 at the center of the hanger rail 12 in the rail width direction, and the front and rear portions (left and right in FIG. 1) in the longitudinal direction of the main body frame 26. Plural (four in this embodiment) mounted on the lower base portion 16 and provided on a pair of upper end portions 26a, 26b spaced apart from each other so as to be rotatable about a horizontal axis perpendicular to the longitudinal direction. Wheels 28 and a plurality of wheels (four in this embodiment) rotatably provided around a vertical axis at positions corresponding to the wheels 28 outside the side walls 24 on both sides of the hanger rail 12. And a guide roller 30. The main body portion 26c of the main body frame 26 extending downward from the opening 18 is provided with a hooking hole 32 for suspending the transported object 14 at the center in the longitudinal direction, and the hooked transportation target is formed in a hook shape. The hook 34 of the object 14 is hooked. The locking hole 32 corresponds to a locking means. The specific configurations of the wheel 28 and the guide roller 30 which will be described later are the same on both sides of the pair of upper end portions 26a and 26b, and structurally there is substantially no distinction between front, rear, left and right. Is completely symmetric.

FIG. 4 shows a cross section taken along the line IV-IV on the side of the one upper end portion 26 a in FIG. As can be seen from this figure, a shaft 36 is integrally fixed to the main body frame 26 by welding in a state of penetrating the upper end portion 26a in the plate thickness direction and projecting both end portions thereof. The inner ring of the bearing 38 is fitted and fixed to both ends of the wheel 38, and the wheel 28 is fitted and fixed to the outer ring of the bearing 38. As a result, the wheels 28 are rolled on the lower base portion 16 of the hanger rail 12 while supporting the main body frame 26, and the entire carriage can be moved in the transport direction perpendicular to the paper surface. The wheel 28 is integrally formed of a synthetic resin such as MC nylon having high hardness and excellent wear resistance so that the outer peripheral portion has a semicircular cross section in a cross section (FIG. 4) parallel to the shaft center. Therefore, the weight of the movable carriage 10 is lighter than that of a conventional metal wheel, and the operating force for movement is reduced, and the rolling contact with the upper surface of the lower base portion 16 is smooth. Since such a contact state is obtained, the noise during rolling, that is, when the moving carriage 10 is moving is smaller than that of a metal wheel.

The diameter of the wheel 28 is set to be slightly smaller than the distance between the lower base portion 16 and the upper base portion 22, and the gap between the upper end of the wheel 28 and the upper base portion 22 is small. Has been done. Therefore, when one of the upper end portions 26a or 26b tries to float up from the lower base portion 16 before and after the transport direction, the wheel 28 comes into contact with the upper base portion 22 with a small lifting margin, and The tilt in the direction is limited. The wheels 28 on both the left and right sides are equal to each other between the side walls 24 on both sides of the hanger rail 12 in a state where the main body frame 26 of the moving carriage 10 is positioned at the center in the rail width direction as shown in FIG. It is attached symmetrically with respect to the main body frame 26 so as to have a gap d. A gap slightly larger than the predetermined gap d is also formed between the wheel 28 and the flange portion 20 of the hanger rail 12.

In the main body frame 26, a plurality of (in the present embodiment, so as to horizontally project from the main body portion 26 c to the outside of both side wall portions 24 of the hanger rail 12 at a position substantially the same as the position of the wheel 28 in the longitudinal direction. The four arm portions 26d are integrally welded and fixed. The guide roller 30 includes a hexagonal head 40a of a hexagonal bolt 40 screwed downwardly in the vertical direction on each tip side of the arm portion 26d, and an upper portion of the arm 26d with the hexagonal head 40a passing therethrough. The outer ring of the bearing 44 is inserted between the spacer 42 and the spacer 42. The distance between the main body 26c and the shaft center of the hexagon bolt 40 and the diameter of the guide roller 30 are such that the gap between the guide roller 30 and the outer surface of the side wall portion 24 is smaller than the predetermined gap d. Has been determined in advance. A lock nut 46 for locking the hexagon bolt 40 is screwed on the lower surface side of the arm portion 26d. The guide roller 30 is positioned at substantially the same height as the lower end of the side wall portion 24 in the vertical direction, and acts on the main body frame 26 when the guide roller 30 comes into contact with the outer surface of the side wall portion 24. Moment is made as small as possible.

The moving carriage 10 configured as described above is moved by being manually guided by an operator together with the transported object 14 while being guided by the hanger rails 12, but at four positions outside the wheels 28. When the guide roller 30 located is in contact with the outer side surface of the side wall portion 24 of the hanger rail 12, the lateral shake of the moving carriage 10 is limited to a slight range, and the wheel 28 and the inner side surface of the side wall portion 24 immediately outside thereof are restricted. A gap is secured between As a result, contact between the side surface of the wheel 28 and the inner surface of the side wall portion 24 is avoided, and the sliding resistance and the sliding contact noise caused by their sliding movement are prevented. The guide roller 30 is provided as a part (outer ring) of the bearing 44 and makes rolling contact with the side wall portion 24 of the hanger rail 12, so that running resistance and abnormal noise due to the contact are relatively small. In addition, since the wheels 28 are made of synthetic resin, smooth rolling contact with the lower base portion 16 is obtained, so that noise during movement is reduced as compared with the case of conventional metal wheels. Therefore, the moving carriage 10 can be configured to be lightweight, and the driving force (operating force) for movement can be further reduced.

Further, since the gap between the wheel 28 of the moving carriage 10 and the upper base portion 22 of the hanger rail 12 is set to be small, an operating force for moving the lower portion of the transported object 14 as an action point. When, for example, is applied, the wheel 28 on the front side in the transport direction is restricted from being largely lifted up, and even when such a behavior occurs, the moving carriage 10 can be moved relatively smoothly.

Next, an embodiment of the second invention will be described. FIG. 5 is a front view of a moving carriage for hanger rails (hereinafter, simply referred to as a moving carriage) 50 according to an embodiment of the second invention, in which the transported object 14 is mounted on the moving carriage 50 arranged on the hanger rail 52. Shown in a suspended state. 6 and 7 are a cross-sectional view taken along the line VI-VI in the center of the bogie of FIG. 5 and a plan view of the hanger rail 52 which is partially cut away and viewed from above. As can be seen from the above figures, the hanger rail 52 has a horizontal cross section perpendicular to the longitudinal direction that is I-shaped, and a pair of upper flange portions 58 that are substantially horizontal above and below the vertical portion 56. And I-shaped steel according to the JIS standard having a lower flange portion 60, respectively. The hanger rail 52 is connected to a support member (not shown) at respective positions separated by a predetermined distance in the longitudinal direction via the upper flange portion 58, so that the hanger rail 52 can be carried on a predetermined carrying path for carrying the object to be carried 14. Is installed at a predetermined height position.

The movable carriage 50 includes a main body frame 66 formed of a pair of plates 64 and the like positioned outside the hanger rail 52 in the rail width direction and parallel to the vertical portion 56, and the plate 64 separated from each other in the longitudinal direction. A plurality (four in this embodiment) mounted on the lower flange portion 60, which are rotatably provided around upper and lower end portions 66a and 66b of each pair at right angles to the longitudinal direction and about a horizontal axis. Wheel 68 and a plurality of (four in this embodiment) guide rollers 70 provided on the outer side of each wheel 68 so as to be relatively rotatable about the same axis. The lower flange portion 60 corresponds to the flange portion in the second invention. Between the main body portions 64a located below the lower flange portions 60 of the pair of plates 64, through the insertion holes 72 formed in the main body portions 64a at the center in the longitudinal direction, the connecting rods 74 are formed at right angles to the longitudinal direction. The connecting rod 74 penetrates the retaining plate 76 for suspending the transported object 14 and the pair of sleeve-shaped spacers 78 on both sides of the retaining plate 76, and sandwiches them between the pair of plates 64. In this state, a pair of nuts 80 are screwed onto both ends of the connecting rod 74 via washers 82, respectively, so that the pair of plates 64 are integrally connected to form a main body frame 66. The hooking plate 76 corresponding to the hooking means is provided with a hooking hole 76a so that the hook 34 can be hooked. The specific configurations of the wheels 68 and the guide rollers 70, which will be described later, are the same in the pair of upper ends 66a and 66b, and there is substantially no distinction between front, rear, left and right, and the structures are completely symmetrical. is there.

FIG. 8 shows a cross section taken along the line VIII-VIII on the side of one upper end portion 66a in FIG. As can be seen from this figure, the shaft 84 disposed inside the upper end portion 66a at a right angle to the plate thickness direction includes the inner ring of the bearing 86, the spacer 88, and the bearing 90 in order from the tip large diameter portion 84a side. The inner ring and the spacer 92 are fitted together, and the nut 94 is screwed from the outside of the upper end portion 66a through the washer 96. A roll pin 98 for preventing looseness is inserted through the nut 94 at right angles to the axis. The wheel 68 is fitted to the outer ring of the bearing 86, and the guide roller 70 having a diameter larger than that of the wheel 68 is fitted and fixed to the outer ring of the bearing 90. While being supported by the main body frame 66, it is rolled on the lower flange portion 60 of the hanger rail 52 to allow the entire carriage to move in the transport direction perpendicular to the paper surface, while the guide roller 70 is A contact surface 70a provided on the side surface of the wheel 68 side in a relatively rotatable state around the same axis as the wheel 68 is capable of contacting the outer end portion 60a of the lower flange portion 60.

The wheel 68 is integrally molded with a synthetic resin such as MC nylon having high hardness and excellent wear resistance so that the outer peripheral portion has a semicircular cross section in the cross section parallel to the axis (FIG. 8). Since a smooth contact state can be obtained in rolling contact with the upper surface of the lower flange portion 60, noise during rolling, that is, during movement of the moving carriage 50 is smaller than that of a metal wheel. The guide roller 70 is made of metal or synthetic resin, and the contact surface 70a has a conical shape having a positive curvature, that is, a partially spherical shape, and is formed on the outer end portion 60a of the lower flange portion 60. When brought into contact with each other, the contact area is small, and a good point contact state in which there is little rubbing between the two is obtained. Further, the wheels 68 on the left and right sides have a predetermined clearance equal to the vertical portion 56 of the hanger rail 52 in a state where the moving carriage 50 is not biased to the left or right in FIG. 8 with respect to the hanger rail 52. It is attached symmetrically with respect to the plate 64 so as to have D. The gap between the guide roller 70 and the outer end portion 60a of the lower flange portion 60 of the hanger rail 52 is set to be smaller than the predetermined gap D.

The moving carriage 50 configured as described above is moved by being guided by the hanger rail 52 together with the transported object 14 by a manual operation of an operator, for example, and is provided outside each wheel 68. The guide roller 70 abuts on the outer end portion 60a of the lower flange portion 60 of the hanger rail 52, so that the lateral shake of the moving carriage 50 is limited to a slight range, and a gap is formed between the wheel 68 and the vertical portion 56. Reserved. As a result, contact between the side surface of the wheel 68 and the side surface of the vertical portion 56 is avoided, and the sliding resistance and the sliding contact noise caused by the sliding are prevented. Further, since the wheels 68 are made of synthetic resin, the noise during movement is reduced due to the good rolling contact state with the lower flange portion 60, as compared with the case of the conventional metal wheels, and the moving carriage 50 Can be configured to be lightweight, and the driving force (operating force) to move can be further reduced.

Further, since the contact surface 70a of the guide roller 70 has a substantially conical shape, the contact area with the outer end portion 60a of the lower flange portion 60 is small, and the guide roller 70 is smaller than the outer end portion 60a. Rolling contact is made well, and the generation of sliding resistance and sliding contact noise between the two is well avoided. In particular, in this embodiment, the contact surface 70a has a positive curvature and is formed into a partially curved surface, so that there is an advantage that a better point contact state can be obtained as compared with the case of a simple conical shape.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in each of the above-described embodiments, the main body frames 26 and 66 are provided with the hooking holes 32 and the hooking plates 76 as the hooking means, respectively. However, hook-shaped hooks for hooking an object to be conveyed. Etc. may be provided on the main body frame. It may have a plurality of hook holes or hooks.

Further, in each of the above-described embodiments, a total of four wheels 28 and 68 are provided, but if it is possible to travel as a truck, an arbitrary number of two or more wheels may be provided. In addition, it is not always necessary to arrange a pair on each side of the hanger rail.

Further, the wheels 28, 68 in the above-described respective embodiments are all integrally molded of synthetic resin, but at least the outer peripheral portion contacting the lower base portion 16 and the lower flange portion 60 is formed. Each may be made of synthetic resin, and parts other than the outer peripheral part may be made of other materials.

In each of the above-described embodiments, a total of four guide rollers 30 and 70 are arranged corresponding to a total of four wheels 28 and 68, but the same number of guide rollers as the wheels are necessarily arranged. It is not necessary to set it. In short, it suffices if the posture of the main body frame can be regulated so as to avoid contact between the wheels and the hanger rails.

Further, the wheels 28, 68 in each of the above-described embodiments have a semicircular cross section on the outer peripheral side in a cross section parallel to the axis, but the cross sectional shape of the outer peripheral part is other than the semicircular shape. But it doesn't matter.

Further, in the above-described first embodiment, each guide roller 30 is provided so as to be brought into contact with the lower end portion of the side wall portion 24 of the hanger rail 12, but it is brought into contact with the upper end portion or the middle portion. It is also possible to provide the guide roller 30 so that the guide roller 30 can be moved. It is also possible to provide a plurality of guide rollers which are vertically separated from each other. In that case, the movable carriage 10 is inclined around the axis parallel to the hanger rail 12 and the side surface of the wheel 28 slides on the side wall portion 24. Can be avoided satisfactorily.

Further, in the guide roller 30 in the first embodiment described above, the outer ring itself of the bearing 44 is made to contact the side wall portion 24 of the hanger rail 12, but the outer side of the outer ring is made of synthetic resin. It is also possible to integrally dispose the ring member and the like so that the ring member comes into contact with the side wall portion 24.

Further, in the above-described second embodiment, the pair of plates 64 are connected by the connecting rod 74, the nut 80 and the like to form the main body frame 66, but they are bent so as to have a U-shaped cross section. The body frame may be composed of a single member such as a pressed material.

Further, in each of the above-described embodiments, the case where the operator manually moves the movable carriages 10 and 50 has been described, but it is also possible to automatically move the movable carriages 10 and 50 by using a driving means such as an electric motor. is there. For example, in the case of the moving carriage 50 of the second embodiment, the moving carriage 50 can be configured to be self-propelled by rotatably driving the wheels 68 by disposing an electric motor outside the plate 64. .

Although not illustrated one by one, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a front view of a hanger rail moving carriage according to an embodiment of the first invention, in which a part of the hanger rail is cut away.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view of the moving carriage for the hanger rail of FIG.
It is a figure which notches and shows a part of hanger rail.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a front view of a hanger rail moving carriage according to an embodiment of the second invention.

6 is a sectional view taken along line VI-VI in FIG.

7 is a plan view of the hanger rail moving carriage of FIG.
It is a figure which notches and shows a part of hanger rail.

8 is a sectional view taken along line VIII-VIII in FIG.

[Explanation of symbols]

 10: Mobile carrier for hanger rails (first invention) 12: Hanger rails 14: Objects to be transported 16: Lower base part 18: Opening 24: Side wall part 26: Main body frame 28: Wheels 30: Guide rollers 32: Hook hole ( Latching means) 38: Bearing 44: Bearing 50: Hanger rail moving carriage (2nd device) 52: Hanger rail 56: Vertical portion 60: Lower flange portion (flange portion) 60a: Outer end portion 66: Main body frame 68: Wheel 70: Guide roller 70a: Contact surface 76: Locking plate (locking means) 86: Bearing 90: Bearing

Claims (2)

[Scope of utility model registration request] 1. A hanger rail having a substantially rectangular frame shape in cross section and having an opening at the center of a substantially horizontal lower base portion. A moving carriage for a hanger rail that can be moved in the longitudinal direction, the main body frame having a hooking means for suspending the object to be transported, and an upper end portion of the main body frame via bearings, respectively, around a substantially horizontal axis. It is rotatably arranged, and is placed on the lower base portion on both sides of the opening,
A plurality of wheels that are made to roll on the lower base portion while supporting the main body frame, and have at least an outer peripheral portion that is in contact with the lower base portion and is made of synthetic resin, and downward from the opening of the main body frame. Outer surfaces of the pair of side wall portions are disposed rotatably around a substantially vertical axis through bearings at portions extending and protruding to the outside of the pair of substantially vertical side wall portions on both sides of the hanger rail. A plurality of guide rollers that limit lateral vibration of the main body frame to secure a gap between the wheel and the pair of side wall portions by being brought into contact with each other. Mobile dolly. 2. A hanger rail moving carriage, which is disposed on a hanger rail having a substantially I-shaped cross section and is movable in the longitudinal direction of the hanger rail in a state in which a transported object is suspended, A main body frame having hooking means for suspending the transported object, and rotatably disposed around upper and lower ends of the main body frame about respective substantially horizontal axes via bearings. A plurality of bearings, each of which is placed on a pair of horizontal flange portions, is rolled on the flange portions while supporting the main body frame, and at least the outer peripheral portion contacting the flange portions is made of synthetic resin. A wheel and a contact surface, which is arranged on the outer side of the wheel so as to be rotatable relative to each other around the same axis via a bearing, and has a substantially conical shape, is formed on the flange portion. A plurality of guide rollers are provided which are brought into contact with the outer end portion to limit lateral deflection of the main body frame to secure a gap between the wheel and the vertical portion of the hanger rail. Mobile dolly for hanger rails.