Plain trolley

Abstract

To provide a plain trolley capable of securing proper use of a mounted member.SOLUTION: A plain trolley is mounted on a rail and is movable in a longitudinal direction of the rail. The plain trolley includes a base part; a pair of rollers that are mounted on the base part with a spacing in a first direction and are rotatable with the first direction as a rotation axis direction; a mounting part mounted on the base part; and a support mechanism that supports the mounting part with respect to the base part so as to rotate by a predetermined angle, with a second direction crossing the first direction as a rotation axis direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to plain trolleys. [Background technology]

[0002] A technique relating to an insulated plain trolley attached to a rail is disclosed in, for example, Japanese Patent Laid-Open Publication No. 10-297735 (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-297735 Summary of the Invention [Problem to be solved by the invention]

[0004] A plain trolley is attached to a rail, such as an I-beam or H-beam, by hooking a pair of rollers onto it. An electric winch, for example, can be attached to the plain trolley. The electric winch can be moved along the length of the rail by the plain trolley to the desired location.

[0005] When lowering the wire, the electric winch attached to the plain trolley may tilt due to the weight of the hook at the end of the wire, making it difficult to lower the wire properly. This is undesirable. It is necessary to ensure that the parts attached to the plain trolley are used appropriately.

[0006] Therefore, one of the objects is to provide a plain trolley that can ensure the proper use of the attached members. [Means for solving the problem]

[0007] A plain trolley according to the present disclosure is attached to a rail and is movable in the longitudinal direction of the rail. The plain trolley includes a base, a pair of rollers attached to the base at a distance in a first direction and rotatable about the first direction as a rotation axis, a mounting part attached to the base, and a support mechanism that supports the mounting part rotatably about a predetermined angle with respect to the base, about a rotation axis in a second direction that intersects the first direction. [Effects of the Invention]

[0008] Such a plain trolley ensures proper use of the attached components. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic perspective view of a plain trolley according to the first embodiment. [Figure 2] FIG. 2 is a schematic plan view of the plain trolley shown in FIG. [Figure 3] FIG. 3 is a schematic front view of the plain trolley shown in FIG. [Figure 4] FIG. 4 is a schematic side view of the plain trolley shown in FIG. [Figure 5] FIG. 5 is a schematic perspective view showing a plain trolley unit with an electric winch attached to the plain trolley shown in FIG. [Figure 6] FIG. 6 is a schematic front view showing a state in which the plain trolley unit to which the electric winch shown in FIG. 5 is attached is attached to a rail. [Figure 7] FIG. 7 is a schematic perspective view showing the base portion and the roller. [Figure 8] FIG. 8 is a schematic plan view of the base portion shown in FIG. [Figure 9] FIG. 9 is a schematic perspective view of the mounting portion. [Figure 10] FIG. 10 is a schematic plan view of the mounting portion shown in FIG. [Figure 11]FIG. 11 is a schematic perspective view of the plain trolley when the mounting portion is rotated by a predetermined angle relative to the base portion. [Figure 12] FIG. 12 is a schematic plan view of the plain trolley shown in FIG. [Figure 13] FIG. 13 is a schematic front view of the plain trolley shown in FIG. [Figure 14] FIG. 14 is a schematic side view of the plain trolley shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. A plain trolley according to the present disclosure is attached to a rail and is movable in the longitudinal direction of the rail. The plain trolley includes a base portion, a pair of rollers attached to the base portion at a distance in a first direction and rotatable about the first direction as a rotation axis direction, a mounting portion attached to the base portion, and a support mechanism that supports the mounting portion rotatably about a predetermined angle relative to the base portion about a rotation axis direction in a second direction intersecting the first direction.

[0011] With this type of plain trolley, the mounting portion is supported by the support mechanism so that it can rotate relative to the base portion with the second direction as the rotation axis direction. Therefore, for example, after moving an electric winch attached to the mounting portion, the mounting portion can be rotated a predetermined angle to lower the wire. This allows the wire to be lowered safely, even when the plain trolley with the electric winch attached is moved along the rail up to a wall, reducing the risk of interference between the hook attached to the end of the wire and the wall. Therefore, this type of plain trolley ensures proper use of the attached components.

[0012] In the above-described plain trolley, the support mechanism may include an elongated hole provided in at least one of the base portion and the mounting portion, a bolt having a barrel portion inserted into the elongated hole and a head portion connected to the barrel portion, and a nut threaded onto the barrel portion of the bolt. This allows the mounting portion to be rotatably supported relative to the base portion by the bolt and the nut while moving the bolt and the nut in the longitudinal direction of the elongated hole. By adopting such a configuration, the mounting portion can be supported relative to the base portion in a relatively simple and reliable manner. Furthermore, the configuration is easy to remove and install, and is inexpensive.

[0013] In the plain trolley, the slots may include a first slot provided in the base portion and a second slot provided in the mounting portion. This allows the bolts and nuts to move the length of the second slot in addition to the length of the first slot in the longitudinal direction. This allows for a larger rotation angle, ensuring more appropriate use of the attached components.

[0014] In the plain trolley, the elongated hole may be shaped like an arc. This allows the mounting part to rotate while being properly guided along the arc. This allows the mounting part to rotate more smoothly.

[0015] In the plain trolley, a plurality of oblong holes may be provided. A plurality of bolts and nuts may be included depending on the number of oblong holes. In this way, the mounting part can be supported by a plurality of bolts and nuts, so that the mounting part can be supported with good posture. Therefore, the mounting part can be supported more stably.

[0016] In the plain trolley, the mounting portion may be rectangular when viewed from the second direction. Four oblong holes may be provided in each of the square areas. By doing so, the four oblong holes and the corresponding bolts and nuts can be used to reduce the risk of the mounting portion rotating at an angle relative to the rotation axis direction during rotation. This allows the mounting portion to rotate stably.

[0017] In the plain trolley, the pair of rollers may be provided at intervals along the longitudinal direction of the rail. This allows the load applied to the plain trolley to be distributed along the longitudinal direction, and also allows smooth movement along the longitudinal direction of the rail.

[0018] The plain trolley according to the present disclosure is attached to a rail and is movable in the longitudinal direction of the rail. The plain trolley includes a base portion and a pair of rollers attached to the base portion at a distance in a first direction and rotatable with their rotation axes in the first direction. The base portion is provided with a slot.

[0019] According to such a plain trolley, the oblong hole can be used to rotatably support the member attached to the base portion, thereby ensuring proper use of the attached member.

[0020] [Details of the embodiments of the present disclosure] Next, an embodiment of the plain trolley of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and the description thereof will not be repeated.

[0021] (Embodiment 1) A plain trolley according to a first embodiment of the present disclosure will be described. FIG. 1 is a schematic perspective view of the plain trolley according to the first embodiment. FIG. 2 is a schematic plan view of the plain trolley shown in FIG. 1. FIG. 2 is a view of the plain trolley shown in FIG. 1 as viewed in the direction indicated by arrow II in FIG. 1. FIG. 3 is a schematic front view of the plain trolley shown in FIG. 1. FIG. 3 is a view of the plain trolley shown in FIG. 1 as viewed in the direction indicated by arrow III in FIG. 1. FIG. 4 is a schematic side view of the plain trolley shown in FIG. 1. FIG. 4 is a view of the plain trolley shown in FIG. 1 as viewed in the direction indicated by arrow IV in FIG. 1. FIG. 5 is a schematic perspective view showing a plain trolley unit with an electric winch attached to the plain trolley shown in FIG. 1. FIGS. 1 and 5 are views from different directions. FIG. 6 is a schematic front view showing the plain trolley unit with the electric winch attached shown in FIG. 5 attached to a rail. Note that FIG. 6 illustrates a cross section of the rail cut along the XZ plane. For ease of understanding, in the following description, the direction indicated by arrow Y will be referred to as the front-rear direction, the direction indicated by arrow X will be referred to as the left-right direction, and the direction indicated by arrow Z will be referred to as the up-down direction. The direction indicated by arrow X, the direction indicated by arrow Y, and the direction indicated by arrow Z are all perpendicular to each other.

[0022] 1, 2, 3, 4, 5, and 6, a plain trolley 11a according to the first embodiment is attached to a rail 12a made of an H-shaped steel or an I-shaped steel. The plain trolley 11a attached to the rail 12a is movable in the Y direction, which is the longitudinal direction of the rail 12a. In addition, an electric winch 13a capable of raising and lowering a wire 16a is attached to the plain trolley 11a as an attached member, for example. For ease of explanation, the state in which the electric winch 13a is attached to the plain trolley 11a will be referred to as a plain trolley unit 10a in this specification. The state in which the plain trolley 11a is attached to the rail 12a and the state in which the electric winch 13a is attached to the plain trolley 11a will be described later.

[0023] The plain trolley 11a is made of metal. Specifically, the plain trolley 11a is configured by combining multiple metal members. The plain trolley 11a includes a base portion 20a, two pairs of rollers 21a, 22a, 23a, and 24a, a mounting portion 25a, and a support mechanism 26a. The support mechanism 26a supports the mounting portion 25a relative to the base portion 20a so that the mounting portion 25a can rotate by a predetermined angle, with a second direction, which is a direction intersecting a first direction (X direction) described below, as the rotation axis direction. In this embodiment, the second direction is a direction perpendicular to the first direction, i.e., the vertical direction. This allows the mounting portion 25a to rotate horizontally with the vertical direction as the rotation axis direction. Therefore, the mounting portion 25a can be rotated with a more stable posture. The support mechanism 26a will be described in detail later. 2 and 12, which will be described later, the central axis 38a of the base portion 20a in the X direction is indicated by a dashed line, and the central axis 39a of the mounting portion 25a in the X direction is indicated by a dashed line. In Fig. 2, the central axis 38a and the central axis 39a overlap.

[0024] FIG. 7 is a schematic perspective view showing the base portion 20a and rollers 21a, 22a, 23a, and 24a. FIG. 7 corresponds to a schematic perspective view showing the plain trolley 11a shown in FIG. 1 with the mounting portion 25a removed. FIG. 8 is a schematic plan view of the base portion shown in FIG. 7. Referring to FIGS. 7 and 8 in addition to FIGS. 1 to 6, rollers 21a and 22a form pairs, and rollers 23a and 24a form pairs. Rollers 21a and 22a are spaced apart in the X direction, which is the first direction. Rollers 21a and 22a are attached to base portion 20a so as to be rotatable around the first direction as the rotation axis direction. Rollers 21a and 22a are configured so that the areas on the opposing sides have a smaller diameter. Like rollers 21a and 22a, rollers 23a and 24a are also spaced apart in the first direction and attached to base portion 20a so as to be rotatable around the first direction as the rotation axis direction. The rollers 23a, 24a are each configured so that the area on the opposing side has a smaller diameter. The pairs of rollers 21a, 22a and the pairs of rollers 23a, 24a are provided in plural pairs (two pairs in this embodiment) spaced apart in the Y direction. When attached to the rail 12a, the pairs of rollers 21a, 22a and the pairs of rollers 23a, 24a are provided at intervals in the longitudinal direction of the rail 12a.

[0025] In this embodiment, an H-shaped steel beam is used as the rail 12a, and the plain trolley unit 10a is attached so that one flat portion 14a contacts, for example, the ceiling surface of a factory. The plain trolley unit 10a is attached so that the small diameter portions of each of the rollers 21a, 22a, 23a, and 24a are placed on the other flat portion 15a of the rail 12a. In other words, the plain trolley unit 10a is attached so that it is suspended from the rail 12a by hooking the small diameter portions of each of the rollers 21a, 22a, 23a, and 24a. This allows the rollers 21a, 22a, 23a, and 24a to rotate smoothly, and the large diameter portions of each of the rollers 21a, 22a, 23a, and 24a to restrict movement of the plain trolley unit 10a in the first direction, the X direction.

[0026] The base portion 20a is configured by combining four plate-shaped members 31a, 32a, 33a, and 34a and two rod-shaped members 35a and 36a. The plate-shaped members 31a and 32a are each flat and have the same shape. The plate-shaped members 31a and 32a are rectangular with rounded corners when viewed from the X direction. The plate-shaped members 31a and 32a are arranged spaced apart in the X direction, with their longitudinal direction in the Y direction and their lateral direction in the Z direction. The plate-shaped members 31a and 32a are arranged parallel to each other when viewed from the Y direction. The plate-shaped members 31a and 32a each have a through-hole 37a for rotatably supporting the rollers 21a, 22a, 23a, and 24a, and a through-hole (not shown) for inserting the rod-shaped members 35a and 36a. Through hole 37a and the through holes for inserting rod-shaped members 35a and 36a are provided to penetrate plate-shaped members 31a and 32a in the thickness direction, respectively. The diameter of the through holes for inserting rod-shaped members 35a and 36a is larger than the diameter of through hole 37a. Rod-shaped members 35a and 36a are attached to the base portion with mounting nuts 27a, 28a, 29a, and 30a attached to both longitudinal ends of rod-shaped members 35a and 36a, respectively.

[0027] The plate-shaped member 33a and the plate-shaped member 34a each have a rectangular shape, with the long side of the rectangular member bent 90 degrees near the center of the short side. The plate-shaped members 33a and 34a are each bent into an L shape when viewed in the Y direction. The plate-shaped member 33a includes a first portion 41a arranged parallel to the XY plane and a second portion 42a arranged parallel to the YZ plane. Similarly, the plate-shaped member 34a includes a first portion 43a arranged parallel to the XY plane and a second portion 44a arranged parallel to the YZ plane. Each of the second portions 42a and 44a has a through-hole (not shown) that penetrates the thickness direction and allows the insertion of the rod-shaped members 35a and 36a. The plate-shaped members 31a, 32a, 33a, and 34a are each connected by two rod-shaped members 35a and 36a arranged at a distance in the Y direction.

[0028] Here, the support mechanism 26a includes first oblong holes 46a and 47a as elongated holes provided in the first portion 41a (see FIG. 8 in particular). The first oblong holes 46a and 47a are provided in an area on the end side in the direction indicated by arrow Y and an area on the end side in the direction opposite to the direction indicated by arrow Y, respectively. The first oblong holes 46a and 47a are each provided in an arc shape. Specifically, the first oblong holes 46a and 47a are each configured so that the inner edge side is positioned closer to the center of the base portion 20a than the outer edge side when viewed in the Z direction. The support mechanism 26a also includes first oblong holes 48a and 49a as elongated holes similarly provided in the first portion 43a. That is, the support mechanism 26a includes four first oblong holes 46a, 47a, 48a, and 49a.

[0029] Next, the configuration of the mounting portion 25a will be described. FIG. 9 is a schematic perspective view of the mounting portion 25a. FIG. 10 is a schematic plan view of the mounting portion 25a shown in FIG. 9. Referring to FIGS. 9 and 10 in conjunction with FIGS. 1 to 8, the mounting portion 25a has a shape obtained by bending a single plate-like member at 90 degrees. The mounting portion 25a includes a first flat plate portion 51a and a second flat plate portion 52a. The first flat plate portion 51a and the second flat plate portion 52a are each rectangular when viewed in the thickness direction. The area of ​​the first flat plate portion 51a is larger than the area of ​​the second flat plate portion 52a. The Y-direction end of the first flat plate portion 51a is connected to the Z-direction end of the second flat plate portion 52a. The first flat plate portion 51a has a pair of circular first mounting holes 53a and 54a that penetrate the first flat plate portion 51a in the thickness direction for mounting the electric winch 13a. A round second mounting hole 55a is provided in the center of the second flat plate portion 52a.

[0030] The electric winch 13a is attached to the attachment portion 25a. Specifically, the electric winch 13a is attached so as to be placed on the first flat plate portion 51a. The electric winch 13a is attached to the attachment portion 25a using first attachment holes 53a and 54a provided in the first flat plate portion 51a and a second attachment hole 55a provided in the second flat plate portion 52a.

[0031] Here, the support mechanism 26a includes second oblong holes 56a, 57a, 58a, and 59a as elongated holes provided in the first flat plate portion 51a of the mounting part 25a. The second oblong holes 56a, 57a, 58a, and 59a are each longer in the X direction than in the Y direction. The second oblong holes 56a, 57a, 58a, and 59a are each provided near the four corners of the first flat plate portion 51a when viewed in the thickness direction (Z direction). The second oblong holes 58a and 59a are provided near the end on the side to which the second flat plate portion 52a is connected, and the second oblong holes 56a and 57a are provided near the other end in the Y direction. The second oblong holes 56a and 58a are provided near one end in the X direction, and the second oblong holes 57a and 59a are provided near the other end in the X direction. The second elongated holes 56a, 57a, 58a, and 59a are provided at positions corresponding to the positions at which the first elongated holes 46a, 47a, 48a, and 49a are provided, respectively.

[0032] The support mechanism 26a also includes four bolts 61a, 62a, 63a, and 64a and four nuts 66a, 67a, 68a, and 69a, corresponding to the number of first oblong holes 46a, 47a, 48a, and 49a and second oblong holes 56a, 57a, 58a, and 59a. The bolts 61a, 62a, 63a, and 64a each include a body 71a, 72a, 73a, and 74a and a head 76a, 77a, 78a, and 79a connected to the body 71a, 72a, 73a, and 74a, respectively. The trunk portions 71a, 72a, 73a, and 74a of the bolts 61a, 62a, 63a, and 64a are inserted into elongated holes, specifically, the first elongated holes 46a, 47a, 48a, and 49a and the second elongated holes 56a, 57a, 58a, and 59a, respectively. The nuts 66a, 67a, 68a, and 69a are threaded onto the trunk portions 71a, 72a, 73a, and 74a of the inserted bolts 61a, 62a, 63a, and 64a. In this manner, the support mechanism 26a supports the mounting portion 25a relative to the base portion 20a so that the mounting portion 25a can rotate by a predetermined angle.

[0033] Next, the state where the mounting portion 25a is rotated a predetermined angle relative to the base portion 20a is shown. Fig. 11 is a schematic perspective view of the plain trolley 11a when the mounting portion 25a is rotated a predetermined angle relative to the base portion 20a. Fig. 12 is a schematic plan view of the plain trolley 11a shown in Fig. 11. Fig. 13 is a schematic front view of the plain trolley 11a shown in Fig. 11. Fig. 14 is a schematic side view of the plain trolley 11a shown in Fig. 11.

[0034] 11 to 14, along with FIGS. 1 to 10, the mounting portion 25a is rotated by a predetermined angle relative to the base portion 20a. That is, the central axis 39a of the mounting portion 25a is rotated by an angle θ around the center of rotation 40a relative to the central axis 38a of the base portion 20a. In this case, the bolts 61a, 62a, 63a, 64a and the nuts 66a, 67a, 68a, 69a can be moved by the longitudinal lengths of the first elongated holes 46a, 47a, 48a, 49a as well as the longitudinal lengths of the second elongated holes 56a, 57a, 58a, 59a. In this embodiment, the angle θ can be set within a range of −20 degrees to +20 degrees. The angle θ may be set within a range of −45 degrees to +45 degrees, taking into account differences in the winding direction of the wire 16a, dimensions, load rating, and the like. In this case, the rotation center axis extends in the Z direction, which is the second direction.

[0035] With this plain trolley 11a, the mounting portion 25a is supported by the support mechanism 26a so that it can rotate relative to the base portion 20a with the second direction as the rotation axis direction. Therefore, for example, after moving the electric winch 13a attached to the mounting portion 25a, the wire 16a can be lowered by rotating the mounting portion 25a by a predetermined angle. This allows the wire 16a to be lowered safely, even when the plain trolley 11a with the electric winch 13a attached is moved along the rail 12a up to a wall, reducing the risk of interference between the hook (not shown) attached to the end of the wire 16a and the wall. Therefore, with this plain trolley 11a, proper use of the attached components can be ensured.

[0036] In this embodiment, the support mechanism 26a includes first oblong holes 46a, 47a, 48a, and 49a as oblong holes provided in the base portion 20a and second oblong holes 56a, 57a, 58a, and 59a as oblong holes provided in the mounting portion 25a, and a pair of support members 26b, 26c, 26d, 26e, 26f, 26g, 26h, 26i, 26j, 26j, 26j, 26k, 26kb, 26i, 26j, 26k, 26k, 26i, 26j, 26k, 26kb, 26i, 26j, 26k ...i, 26j, 26k, 26k, 26k The mounting portion 25a includes bolts 61a, 62a, 63a, and 64a having trunks 71a, 72a, 73a, and 74a and heads 76a, 77a, 78a, and 79a connected to the trunks 71a, 72a, 73a, and 74a, and nuts 66a, 67a, 68a, and 69a threaded onto the trunks 71a, 72a, 73a, and 74a of the bolts 61a, 62a, 63a, and 64a. Thus, while the bolts 61a, 62a, 63a, and 64a and the nuts 66a, 67a, 68a, and 69a are moved in the longitudinal direction of the elongated holes, the mounting portion 25a can be rotatably supported relative to the base portion 20a by the bolts 61a, 62a, 63a, and 64a and the nuts 66a, 67a, 68a, and 69a. By adopting such a configuration, the mounting portion 25a can be supported on the base portion 20a in a relatively simple and reliable manner. In addition, the configuration is easy to remove and install, and is inexpensive.

[0037] In this embodiment, the elongated holes include first elongated holes 46a, 47a, 48a, and 49a provided in the base portion 20a and second elongated holes 56a, 57a, 58a, and 59a provided in the mounting portion 25a. Therefore, the bolts 61a, 62a, 63a, and 64a and the nuts 66a, 67a, 68a, and 69a can be moved by the longitudinal lengths of the first elongated holes 46a, 47a, 48a, and 49a as well as the longitudinal lengths of the second elongated holes 56a, 57a, 58a, and 59a. This allows for a larger rotation angle, ensuring more appropriate use of the attached components.

[0038] In this embodiment, the first elongated holes 46a, 47a, 48a, and 49a are arc-shaped. Therefore, the mounting portion 25a can be rotated while being appropriately guided along the arc-shaped holes. This allows the mounting portion 25a to rotate more smoothly.

[0039] In this embodiment, multiple, specifically four, first elongated holes 46a, 47a, 48a, 49a and second elongated holes 56a, 57a, 58a, 59a are provided. The support mechanism 26a includes multiple, specifically four, bolts 61a, 62a, 63a, 64a and nuts 66a, 67a, 68a, 69a, corresponding to the number of first elongated holes 46a, 47a, 48a, 49a and second elongated holes 56a, 57a, 58a, 59a. Therefore, the mounting portion 25a can be supported by the multiple bolts 61a, 62a, 63a, 64a and nuts 66a, 67a, 68a, 69a, allowing the mounting portion 25a to be supported with good posture. This allows the mounting portion 25a to be supported more stably.

[0040] In this embodiment, the mounting portion 25a is rectangular when viewed from the second direction. Four first oblong holes 46a, 47a, 48a, 49a and four second oblong holes 56a, 57a, 58a, 59a are provided in the area where the square is located. Therefore, by using the four first oblong holes 46a, 47a, 48a, 49a and the four second oblong holes 56a, 57a, 58a, 59a and the bolts 61a, 62a, 63a, 64a and nuts 66a, 67a, 68a, 69a corresponding to the first oblong holes 46a, 47a, 48a, 49a and the second oblong holes 56a, 57a, 58a, 59a, respectively, it is possible to reduce the risk of the mounting portion 25a rotating at an angle relative to the rotation axis direction during rotation. This allows the mounting portion 25a to rotate stably.

[0041] In this embodiment, a plurality of pairs of rollers 21a, 22a, 23a, 24a are provided at intervals in the longitudinal direction of the rail 12a. This allows the load applied to the plain trolley 11a to be distributed in the longitudinal direction. Furthermore, the rail 12a can be smoothly moved in the longitudinal direction.

[0042] (Other embodiments) In the above embodiment, the first long hole is provided in the base portion and the second long hole is provided in the mounting portion, but this is not limited to this, and the long hole may be provided in at least one of the base portion and the mounting portion.

[0043] In the above embodiment, the first oblong hole is arc-shaped, but this is not limiting, and the first oblong hole may simply extend in a straight line. Also, the second oblong hole may be arc-shaped.

[0044] In the above embodiment, the elongated holes may be provided in pairs on diagonal lines around the rotational center axis, instead of at the four corners, or only one may be provided.

[0045] Furthermore, in the above-described embodiments, the plain trolley may be configured without the mounting portion. That is, the plain trolley according to the present disclosure is attached to a rail and is movable in the longitudinal direction of the rail. The plain trolley includes a base portion and a pair of rollers attached to the base portion at a distance in a first direction and each of which is rotatable with its axis of rotation in the first direction. A slot is provided in the base portion. That is, the plain trolley may have the configuration shown in Figures 7 and 8.

[0046] According to such a plain trolley, the oblong hole can be used to rotatably support the member attached to the base portion, thereby ensuring proper use of the attached member.

[0047] It should be understood that the embodiments disclosed herein are illustrative in all respects and are not limiting in any respect. The scope of the present invention is defined not by the above description but by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0048] 10a plain trolley unit, 11a plain trolley, 12a rail, 13a electric winch, 14a, 15a flat portion, 16a wire, 20a base portion, 21a, 22a, 23a, 24a roller, 25a mounting portion, 26a support mechanism, 27a, 28a, 29a, 30a mounting nut, 31a, 32a, 33a, 34a plate-shaped member, 35a, 36a rod-shaped member, 37a through hole, 38a, 39a central axis, 40a center, 41a, 43a first portion, 42a, 42a second portion, 46a, 47a, 48a, 49a first oblong hole, 51a first flat portion, 52a second flat portion, 53a, 54a first mounting hole, 55a Second mounting holes, 56a, 57a, 58a, 59a Second oblong holes, 61a, 62a, 63a, 64a Bolts, 66a, 67a, 68a, 69a Nuts, 71a, 72a, 73a, 74a Body, 76a, 77a, 78a, 79a Head.

Claims

1. A plain trolley attached to a rail and movable in the longitudinal direction of the rail, A base portion; a pair of rollers attached to the base portion at an interval in a first direction, each of which is rotatable with its rotation axis directed in the first direction; a mounting portion attached to the base portion; A plain trolley comprising: a support mechanism that supports the mounting portion so that it can rotate a predetermined angle relative to the base portion, with a second direction that intersects the first direction as the rotation axis direction.

2. The support mechanism includes: an elongated hole provided in at least one of the base portion and the mounting portion; a bolt having a body portion inserted into the elongated hole and a head portion connected to the body portion; 2. The plain trolley of claim 1, further comprising a nut threaded onto the shaft of the bolt.

3. The slot is a first oblong hole provided in the base portion; The plain trolley according to claim 2, further comprising a second oblong hole provided in the mounting portion.

4. 4. A plain trolley according to claim 2 or claim 3, wherein the oblong hole has an arcuate shape.

5. The oblong holes are provided in plurality, The plain trolley according to claim 2 or 3, wherein the support mechanism includes a plurality of the bolts and a plurality of the nuts, each corresponding to the number of the elongated holes.

6. The mounting portion has a rectangular shape when viewed from the second direction, 6. The plain trolley according to claim 5, wherein four of the oblong holes are provided in each of the areas where the squares are located.

7. 3. A plain trolley according to claim 1, wherein the pair of rollers comprises a plurality of pairs of rollers spaced apart in the longitudinal direction of the rail.

8. A plain trolley attached to a rail and movable in the longitudinal direction of the rail, A base portion; a pair of rollers attached to the base portion at an interval in a first direction, each of which is rotatable with its rotation axis directed in the first direction; A plain trolley, wherein the base portion is provided with a slot.

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