JP2014015175A - Turning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turning device eliminating the need of providing an installation surface by digging down, enabling the fixed point turning of a baggage by a portable and simple structure, and being adaptable to a truck which does not use a rail.SOLUTION: A turning device includes: a base plate 420; two universal wheels 430 provided separately from each other under the base plate 420; a turning shaft 440 having suspending length shorter than the universal wheels, and provided with a truck side engaging portion 441 at a lower end portion; and a traveling wheel 450 on the opposite side to the universal wheels 430 across the turning shaft 440. The turning shaft 440 is provided at a position shifted in a direction to the traveling wheel 450 from a position on the base plate 420 corresponding to the gravity center of the turning device 401, and a floor surface side engaging portion 460 provided at an optional position on a floor surface is engaged with the turning shaft 440 to relatively rotate, thereby enabling fixed point turning while floating the traveling wheel 450.

Description

  The present invention relates to an apparatus for turning a heavy object or the like in a fixed position.

  Conventionally, various turning devices, ie, turntables, for changing the direction of a load have been invented. For example, the technique of patent document 1 is mentioned as a technique for changing the direction of a trolley | bogie. This is because there is no need to adjust the turning angle of the turntable, the direction of the carriage entering the turntable is not limited, and the problem is that the structure is simple and the cost can be reduced. A turntable 10 that is disposed at the intersection of the rails 130 and 140 and supports the flanged wheel 110 of the rail carriage 100 that can travel on the rail, and can turn horizontally when steering the wheel. A support part capable of supporting the tread of the wheel with a flange of the rail carriage is formed in a rotating body shape coaxial with the horizontal rotation shaft, and the wheel flange part passes between the support part and the end of the rail. A passage space that allows the

JP 2006-137390 A

  However, what enables fixed-point turning is a large one fixed to the installation surface, and it is necessary to dig up and embed the installation surface. Further, as in the invention described in Patent Document 1, the present invention is applied to a turntable for a wheel of a rail carriage that travels on a rail, and is not applied to a carriage that does not use a rail.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a turning device that does not require the installation surface to be dug down, enables a fixed point turning of a load with a simple and portable structure, and can be applied to a carriage that does not use rails. .

  In view of the above problems, the present invention provides a base plate, two universal wheels provided below the base plate and spaced apart from each other, a turning shaft provided below the base plate and spaced from the universal wheel, A turning device in which the free wheel turns around the turning shaft with the turning shaft as a fixed point while receiving a load from the base plate by the free wheel and the turning shaft.

  Further, the present invention provides a traveling wheel on the side facing the universal wheel across the turning shaft, and the height can be adjusted so that the turning shaft takes a grounded state and a non-grounded state. This is a turning device that is a trolley capable of turning at a fixed point.

  The present invention is also a turning device in which the height of the turning shaft can be adjusted so that the turning shaft takes a grounded state and a non-grounded state by making the rolling shaft extendable up and down.

  In the present invention, the turning shaft is made shorter than the universal wheel and the traveling wheel, so that the turning shaft is in an ungrounded state, and a cart side engaging portion is provided at a lower end portion of the turning shaft, A rolling device in which a floor surface side engaging portion is provided on a surface, and the bogie side engaging portion engages with the floor surface side engaging portion, whereby the rotating shaft takes a grounding state and can be adjusted in height. is there.

  Further, the present invention is a fixed wheel in which the traveling wheel is fixed in the traveling direction, and the turning shaft is provided at a position deviated from the position on the base plate corresponding to the center of gravity in the traveling wheel direction. The turning device floats the traveling wheel by adjusting the height of the turning shaft and enables a fixed point turning.

  The base plate can be rectangular, square, circular, or other irregular shapes.

  The universal wheel refers to a wheel that can rotate in any direction with respect to a ground contact surface. That is, a wheel that rotates on the floor surface, and that the wheel can turn in the horizontal direction, or a wheel that rotates on the floor surface. For example, a free caster, a ball caster, etc. are mentioned.

  The turning shaft can be horizontally swiveled by providing a swivel mechanism with a sliding shaft, but other methods may be used. For example, the lower end portion of the rotating shaft may be formed in a hemispherical shape so that it can turn horizontally in a member having a hemispherical concave portion installed on the floor surface.

  The said trolley | bogie in this invention travels by pushing or towing | pulling. The cart can be applied to a cart with a caster in addition to a cart with a handle for pushing, a pallet without a handle, a cart having a frame on a base plate, and the like.

  The traveling wheel is a wheel provided in addition to the universal wheel in order to make the turning device a traveling carriage. The traveling wheel may be the same as the universal wheel, unless otherwise specified, or may be a fixed wheel in which the rotation direction of the wheel is fixed. Further, any number of the traveling wheels may be provided, and it is not necessary to provide them separately from the universal wheels. For example, it can be a cart with six or more wheels together with the universal wheel.

  “Fixed-point turning” means that the turning device according to the present invention turns around the turning axis that becomes a fixed point at an arbitrary position.

  The “position on the base plate corresponding to the center of gravity” refers to a position obtained by vertically projecting the center of gravity of the turning device onto the base plate in a state where the turning device is placed in use. In addition, the “center of gravity of the turning device” here is not limited to the center of gravity of the turning device itself, and in the case where a baggage to be turned by the present invention is assumed in advance, the center of gravity including the baggage is assumed. You can also. Further, when the floor surface side engaging portion is used in the turning device, the “center of gravity of the turning device” is considered without including the weight of the floor surface side engaging portion.

  The member which comprises the turning apparatus of this invention can be used regardless of metal, resin, wooden, etc.

  The turning device according to the present invention can be used when performing fixed point turning of a load. That is, for example, by installing the turning device of the present invention under a target load and turning the universal wheel around the turn shaft with the turning shaft as a fixed point, the direction of the load is turned in a space-saving manner. Can do. Further, this turning device can be installed without digging down the installation surface.

  In addition, the turning device according to the present invention can be a cart that can be driven by hand-pushing or towing by providing the traveling wheel and making the turning shaft vertically extendable.

  Further, the turning device according to the present invention can be made to travel by making the turning shaft shorter than the universal wheel and the traveling wheel. At this time, the cart side engaging portion and the floor surface side engaging portion are provided, and these are engaged and rotated relative to each other, whereby a cart capable of rotating at a fixed point can be obtained.

  The traveling wheel may be a free wheel or a fixed wheel. However, when the traveling wheel is provided as a fixed wheel, the traveling stability of the carriage can be improved thereby. At this time, by turning the turning shaft from the position on the base plate corresponding to the center of gravity toward the traveling wheel, the turning shaft can be smoothly turned at a fixed point while receiving a load by the turning shaft and the free wheel.

  When the turning device according to the present invention is applied to a carriage, it is used for conveying parts such as a carriage with a handle for pushing, a pallet without a handle, a cart with a frame on the carriage, a table with a caster, etc. Or, it can be applied to anything that travels by towing.

  The turning device according to the present invention can be manufactured with a simple structure and can be added to an existing carriage, so that it can be introduced at low cost.

(A) is a bottom view of the rolling device 1 of Example 1 by this invention. FIG. 2B is a side view of the turning device 1 of the first embodiment. It is a bottom view which shows the mode of the fixed point rotation of the rolling apparatus 1 of the Example 1. FIG. It is a schematic diagram which shows turning shaft 4 'of the modification of the Example 1. FIG. (A) is a bottom view of the rolling device 201 of Example 2 by this invention. (B) is a side view of the turning device 201 of the second embodiment. It is a bottom view of the turning device 301 of Example 3 by this invention. It is a bottom view which shows another arrangement | positioning of the universal wheel 330 'and traveling wheel 350' in the Example 3. It is a perspective view of the rolling device 401 of Example 4 by this invention. It is a side view of the rolling device 401 of the same Example 4. It is a front view of the rolling device 401 of the same Example 4. It is a bottom view of the rolling device 401 of the same Example 4. (A) is a top view of the floor surface side engaging part 460 of the same Example 4, (b) is a perspective view of the floor surface side engaging part 460 of the same Example 4. FIG. (A) is the lower part side view of the rolling device 401 of the Example 4. FIG. (B) is a side view which shows the mode of engagement with the cart side engaging part 441 and the floor surface side engaging part 460 in the Example 4. FIG. It is a bottom view of the turning device 501 of Example 5 by this invention. (A) is the perspective view of the floor surface side engaging part 560 of the Example 5. FIG. (B) is the perspective view of the state which turned the floor surface side engaging part 560 sideways. (A) is the lower part side view of the turning apparatus 501 of the Example 5. FIG. (B) is a side view which shows the mode of engagement with the cart side engaging part 541 and the floor surface side engaging part 560 in Example 5. FIG. It is a front view which shows the mode of engagement with the cart side engaging part 541 and the floor surface side engaging part 560 in the Example 5. FIG. It is a lower part side view of turning device 501 'of the modification of the Example 5.

  A turning device 1 according to a first preferred embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1A and 1B, the rolling device 1 is separated from the base plate 2, the two free wheels 3 provided below the base plate 2, and the free wheels 3 below the base plate 2. The rotating shaft 4 is provided, and a fixed-point turning about the rotating shaft 4 is made possible while receiving a load from the base plate 2 by the free wheel 3 and the rotating shaft 4.

  As shown in FIG. 1, the base plate 2 is a rectangular plate body, but is not limited thereto, and a circular plate or other different shapes can also be used.

  The universal wheel 3 is two universal casters provided to hang down from the bottom surface of the base plate 2. In addition, a ball caster or the like can be used for the universal wheel 3. Three or more universal wheels 3 may be provided.

  The rotating shaft 4 is a shaft member that can be swiveled horizontally and includes a swivel mechanism that is provided to hang from the bottom surface of the base plate 2. The turning shaft 4 is provided with the same hanging length as the free wheel 3. The rotating shaft 4 is provided at an equal distance from the two free wheels 3, but is not limited thereto and can be arranged. Rubber 5 is attached to the lower surface of the rotating shaft 4 to improve the gripping force so that it can turn at a fixed point. The rotating shaft 4 may be vertically expandable / contractable as described later.

  FIG. 3 shows a turning shaft 4 ′ which is a modification of the turning shaft 4. The rotating shaft 4 ′ includes a shaft 42 having a semispherical convex portion 41 and a receiving tray 44 having a semispherical concave portion 43 corresponding thereto.

  The use and effect of the turning device 1 according to the first embodiment will be described. When the turning device 1 is used, as shown in FIG. 2, by turning the two free wheels 3 around the turning shaft 4, the load placed thereon can be turned at a fixed point. Since this turning can be smoothly performed by the lateral turning of the turning shaft 4 and the rotation direction of the free wheel 3 being free, the labor of the operator can be reduced or the number of people can be reduced. . The load placed on the turning device 1 and turned at a fixed point can be applied to a wide variety of items. For example, it can also be used for moving and organizing heavy objects such as press machines and molds, moving assembly houses, old private houses, and other structures.

  Hereinafter, a turning device 201 according to a second embodiment of the present invention will be described with reference to FIG. The reference numerals used in the configuration common to the first embodiment are the 200s in the first embodiment, and the same points as in the first embodiment are used and the description thereof is omitted. As shown in FIG. 4, the turning device 201 sandwiches the base plate 220, the two free wheels 230 provided below the base plate 220 and spaced apart from each other, the up and down turning shaft 240, and the turning shaft 240. The vehicle is provided with a traveling wheel 250 on the side facing the free wheel 230, and is a cart that can travel and can rotate around a fixed point. Hereinafter, each part will be described.

  The base plate 220 and the universal wheel 230 are the same as those in the first embodiment, and are arranged in the same manner (see FIGS. 1A and 4A).

  The rotating shaft 240 can be pivoted horizontally at a fixed point as in the first embodiment. However, unlike the first embodiment, a rotating shaft 240 that can be vertically expanded and contracted is used. Examples of materials that can be expanded and contracted up and down include those using a crank that causes the stepping force to expand and contract vertically, pantograph jacks, air jacks, and electric jacks, but are not limited to these. You can also. In this embodiment, a rotating shaft 240 is formed by providing a swivel portion 241 at the lower portion using a manual pantograph jack. The rotating shaft 240 can be adjusted in height by being vertically expandable and contractable. When the rotating shaft 240 is extended, the rotating shaft 240 has the same hanging length as that of the free wheel 230 and takes a grounding state. It becomes a length and takes an ungrounded state.

  As shown in FIGS. 4A and 4B, the traveling wheel 250 is two free casters similar to the free wheel 230 provided on the side facing the free wheel 230 with the turning shaft 240 interposed therebetween.

  About arrangement | positioning of the universal wheel 230, the rotating shaft 240, and the traveling wheel 250, as shown to Fig.4 (a), the universal wheel 230 and the traveling wheel 250 are provided in the four corners of the base plate 220. FIG. The number and arrangement of the universal wheel 230 and the traveling wheel 250 are not limited to this and can be applied (see FIG. 6 of Example 3 described later). Moreover, although the rotating shaft 240 is provided in the center of the base plate 220, it is not restricted to this, You may provide in the other position in the base plate 220. FIG.

  The use and effect of the turning device 201 according to the second embodiment will be described. The turning device 201 can be used as a cart capable of traveling in a non-grounded state in which the turning shaft 240 is contracted. When it is desired to rotate, the rotating shaft 240 is extended at a desired position to be in a grounded state, and can be rotated around the rotating shaft 240 at a fixed point in the same manner as in the first embodiment. Since the free caster that freely moves in the rotation direction is used as the free wheel 230 and the traveling wheel 250, the turning device 201 can be smoothly turned. Usually, in order to turn the carriage, a certain range of space is required by the minimum turning radius of traveling steering. However, the turning device 201 of this embodiment applied to the carriage turns the load placed on the fixed point at a fixed point. Therefore, it is possible to move the luggage in a small place and change the direction.

  Hereinafter, a turning device 301 according to a third embodiment of the present invention will be described with reference to FIG. The code | symbol attached | subjected to the structure which is common in Example 2 shall be 300 series of the thing in Example 2, and the description is used. As shown in FIG. 5, the turning device 301 sandwiches a base plate 320, two universal wheels 330 that are provided below the base plate 320 so as to be spaced apart from each other, a rotating shaft 340 that can be vertically expanded and contracted, and a rotating shaft 340. The vehicle is provided with a traveling wheel 350 on the side facing the universal wheel 330, and is a cart that can travel and can rotate around a fixed point. The third embodiment is different from the second embodiment using a free caster in that a fixed caster is used as the traveling wheel 350. Hereinafter, each part will be described.

  The base plate 320 and the universal wheel 330 are the same as those in the second embodiment, and are arranged in the same manner (see FIGS. 4A and 5).

  The turning shaft 340 is provided at a position deviated in the direction of the traveling wheel 350 from the position on the base plate 320 corresponding to the center of gravity of the turning device 301, that is, a position deviated from the center of the base plate 320 in the direction of the traveling wheel 350. The rotating shaft 340 uses a height-adjustable shaft similar to that in the second embodiment. However, when the shaft 340 is extended, the rotating shaft 340 is slightly longer than the same hanging length as the free wheel 330 and assumes a ground contact state. It is assumed that the hanging length is shorter than that of the wheel 330 and the non-grounding state is assumed.

  As shown in FIG. 5, the traveling wheel 350 is two fixed casters provided on the side facing the free wheel 330 with the rotation shaft 340 interposed therebetween.

  The number and arrangement of the universal wheels 330 and the traveling wheels 350 are not limited to the four corners of the base plate 320 as shown in FIG. For example, as shown in FIG. 6, the free wheel 330 ′ may be disposed in the middle of the three end sides of the base plate 320 ′, and the traveling wheel 350 ′ may be disposed in the middle of the remaining one end side. At this time, it is preferable to avoid interference with the traveling wheel 350 ′ by using an air jack or the like as the turning shaft 340 ′.

  Hereinafter, the use and effect of the turning device 301 according to the third embodiment will be described. The turning device 301 can be used as a cart capable of traveling in a non-grounded state in which the turning shaft 340 is contracted. When it is desired to rotate, the rotating shaft 340 is extended at a desired position to be in a grounded state, and can be rotated around the rotating shaft 340 in the same manner as in the second embodiment. The turning device 301 can improve running stability as a cart by using the running wheels 350 as fixed casters.

  When the turning shaft 340 is provided in the direction of the traveling wheel 350 from the position on the base plate 320 corresponding to the center of gravity of the turning device 301 and the turning shaft 340 is extended, the drooping length becomes slightly longer than the free wheel 330. In the grounding state of the turning shaft 340, the load is biased toward the free wheel 330, and the load applied to the base plate 320 is supported by the turning shaft 340 and the free wheel 330, and the traveling wheel 350 can be floated. Accordingly, it is possible to smoothly perform the turning operation while providing traveling wheels 350 that are fixed casters to improve traveling stability.

  Hereinafter, a turning device 401 according to a fourth embodiment of the present invention will be described with reference to FIGS. The code | symbol attached | subjected to the structure which is common in Example 3 shall be 400 series of the thing in Example 3, and the description is used and abbreviate | omitted. As shown in FIGS. 7 to 12, the turning device 401 includes a base plate 420, two universal wheels 430 that are provided below the base plate 420 and spaced apart from each other, and a lower hanging length that is shorter than the universal wheel. Provided with a rotating shaft 440 provided with a cart side engaging portion 441 and a traveling wheel 450 on the side facing the free wheel 430 across the rotating shaft 440, and provided on an arbitrary position on the floor surface. By engaging with the portion 460 and rotating relative to each other (see FIG. 12), the cart can be rotated at a fixed point. Further, as shown in FIGS. 7 to 9, the turning device 401 includes a frame body 470, a handle 471, and a foot brake 472 on a base plate, and is used as a basket car. Hereinafter, each part will be described.

  The base plate 420, the universal wheel 430, and the traveling wheel 450 are the same as those in the third embodiment.

  As shown in FIG. 8, the rotating shaft 440 includes a cart-side engaging portion 441 provided on the lower surface of the base plate 420. As shown in FIGS. 8 and 9, the cart-side engaging portion 441 is a free caster having a hanging length from the base plate 420 shorter than the universal wheel 430.

  The floor surface engaging portion 460 is a member that is provided at an arbitrary position on the floor surface and has a shape that engages with the cart side engaging portion 441. As shown in FIGS. 11 (a), 11 (b), and 12 (b), the floor surface side engaging portion 460 has two guide rails 462 facing each other on the base 461 fixed to the floor surface. It is a member having an opening and having a stopper 463 on the other side. The floor surface side engaging portion 460 is detachably fixed to an arbitrary position on the floor surface by a bolt.

  The use and effect of the turning device 401 according to the fourth embodiment will be described. The turning device 401 can be used as a dolly capable of traveling, and by engaging the dolly side engaging portion 441 with the floor surface side engaging portion 460 provided at a desired position, the turning shaft can be grounded. It is possible to make a fixed point rotation around the rotation axis 440. More specifically, the turning device 401 can change the direction with the minimum turning radius at the engagement position between the carriage side engaging portion 441 and the floor surface side engaging portion 460 and turned 180 degrees. In the state or the state of 360 turning, the turning device 401 can be pulled out of the floor surface side engaging portion 460 and run in the reverse direction.

  In order to engage the cart side engaging portion 441 with the floor surface side engaging portion 460, the floor surface side engaging portion 460 is driven while the rolling device 401 is running and the cart side engaging portion 441 is guided by the guide rail 462. Can be carried out by positioning and mounting by the stopper 463. As a result, the traveling wheel 450 that is a fixed caster is floated, and the load can be supported by the turning shaft 440 and the free wheel 430 that are not limited in the rolling direction, and the turning operation can be performed smoothly.

  Hereinafter, a turning device 501 according to a fifth embodiment of the present invention will be described with reference to FIGS. The reference numerals used in the configuration common to the fourth embodiment are the 500s in the fourth embodiment, and the description thereof is omitted here. As shown in FIGS. 13 to 16, the turning device 501 is different in the shapes of the cart-side engaging portion 541 and the floor surface-side engaging portion 560 from those in the fourth embodiment. Hereinafter, each part will be described.

  As shown in FIG. 13, the carriage-side engaging portion 541 is a substantially semi-cylindrical member provided in a direction perpendicular to the traveling direction at a position deviated from the position corresponding to the center of gravity of the turning device 501 toward the traveling wheel 550. It is. The carriage side engaging portion 541 is provided with an engaging plate 542 in which the hanging length from the base plate 520 becomes smaller smoothly in the traveling direction. As will be described later, an engagement plate 542 may be provided on the opposite side of the traveling direction of the carriage side engaging portion 541 so that the turning device 501 can travel in any direction (FIG. 17).

  The floor-side engaging portion 560 is a member that is provided at an arbitrary position on the floor surface, has a shape that engages with the cart-side engaging portion 541, and is capable of turning laterally. As shown in FIG. 14, the floor surface side engaging portion 560 is provided on a base 561 fixed to the floor, a swivel portion 564 that can be swiveled on the base 561, and an upper side of the swivel portion 564. It consists of two parallel wheels 565, a positioning plate 567 provided on the upper side of the swivel part 564, and a ball plunger 568 provided adjacent to the base 561 on the lower side of the swivel part 564. Here, the positioning plate 567 is a plate body provided horizontally and has a positioning hole 566. On the other hand, the ball plunger 568 has a rotating part at the top. When the floor-side engaging portion 560 is turned by the swivel portion 564 and the positioning plate 567 is directly above the ball plunger 568, the floor-side engaging portion 560 is turned by the engagement with the positioning hole 566. The position angle at is determined. The carriage side engaging portion 541 functions as a turning shaft similar to that in the third embodiment by engaging with the floor surface side engaging portion 560 (see FIG. 15).

  The use and effect of the turning device 501 according to the fifth embodiment will be described. In order to engage the cart side engaging portion 541 with the floor surface side engaging portion 560, the rolling device 501 travels and rides on the wheel 565 using the engaging plate 542. More specifically, the turning device 501 can change the direction with the minimum turning radius at the engagement position between the carriage side engaging portion 541 and the floor surface side engaging portion 560, and has turned 180 degrees. In the state, the vehicle can travel in the same direction as the original, and in the state of 360 rotations, the vehicle can travel in the reverse direction.

  Here, FIG. 17 shows a turning device 501 ′ which is a modification of the turning device 501. The turning device 501 ′ is provided with a similar engagement plate 543 on the opposite side of the engagement plate 542 ′ sandwiching the carriage side engagement portion 541 ′. When the turning device 501 is turned 180 degrees from the state shown in FIG. 15 (b), traveling in the direction reversed from the original traveling direction is restricted by the carriage side engaging portion 541. According to this modification, Even if the turning device 501 ′ turns 180 degrees at the engagement position between the carriage side engaging portion 541 ′ and the floor surface side engaging portion 560 ′, it can not only run in the same direction as the original, but also in the reverse direction. Can also run.

  In a state where the cart side engaging portion 541 and the floor surface side engaging portion 560 are engaged, the substantially semi-cylindrical shape of the cart side engaging portion 541 rides on the two wheels 565 of the floor surface side engaging portion 560. It will be in a state (refer to Drawing 15 (a) (b)). At this time, the substantially semi-cylindrical shape of the carriage side engaging portion 541 plays a role of a stopper with respect to the wheel 565, so that the driven turning device 501 can be stabilized in the engaged state.

  Before engaging the carriage side engaging portion 541 with the floor surface side engaging portion 560, as shown in FIG. 15B, the positioning hole 566 provided in the positioning plate 567 in advance is engaged with the ball plunger 568. If the upper side of the swivel part 564 of the floor surface side engaging part 560 is rotated so that it will be in this state, this engagement can be performed smoothly. By this engagement, the traveling wheel 550 that is a fixed caster is floated, and the load can be supported by the turning shaft 540 and the free wheel 530 that are not limited in the rolling direction, and the turning operation can be performed smoothly.

  In the floor side engaging portion 560, the ball plunger 568 is provided only on one side (see FIGS. 15A and 15B), but if the other side is provided with a ball plunger 568 ′ (not shown), the ball plunger 568 is turned. The device 501 can be rotated at a predetermined angle. For example, if a ball plunger 568 ′ is provided 180 degrees opposite to the ball plunger 568 across the wheel 565 in the floor surface side engaging portion 560, the state where the turning device 501 is turned 180 degrees is set to the positioning hole 566 and the ball plunger. This can be grasped by the feeling of engagement of 568 ', and the turning device 501 can be turned 180 degrees. Similarly, if the angle formed by the ball plunger 568, the wheel 565, and the ball plunger 568 ′ is set to a desired angle, the turning device 501 can be turned at that angle.

  As mentioned above, this invention is not limited to the said embodiment, As long as it belongs to the technical scope of this invention, it can take a various form. Modifications and the like can be made without departing from the technical idea of the present invention, and such modifications and equivalents are also included in the technical scope of the present invention.

1, 201, 301, 401, 501 ... rolling devices 2, 220, 320, 420, 520 ... base plates 3, 230, 330, 430, 530 ... free wheels 4, 240, 340, 440, 540 ... Rotating shafts 250, 350, 450, 550 ... Traveling wheels 441, 541 ... Dolly side engaging portions 460, 560 ... Floor side engaging portions

Claims (5)

A base plate,
Two universal wheels provided at a distance from each other under the base plate,
A rotating shaft provided separately from the universal wheel under the base plate,
A turning device in which the universal wheel orbits around the turning shaft around the turning shaft while receiving a load from the base plate by the free wheel and the turning shaft.   A traveling wheel is provided on the side facing the universal wheel across the turning shaft, and the height can be adjusted so that the turning shaft takes a grounded state and a non-grounded state, thereby enabling traveling and fixed point turning. The turning device according to claim 1, wherein the turning device is a carriage.   The turning device according to claim 2, wherein the turning shaft can be vertically expanded and contracted, so that the height of the turning shaft can be adjusted so as to take a grounded state and a non-grounded state. By making the turning shaft shorter than the free wheel and the traveling wheel, the turning shaft takes a non-grounded state,
A bogie-side engaging portion is provided at the lower end of the turning shaft, a floor-side engaging portion is provided on the floor surface, and the bogie-side engaging portion engages with the floor-side engaging portion, thereby 3. The turning device according to claim 2, wherein the shaft is grounded and the height can be adjusted. The traveling wheel is a fixed wheel whose direction is fixed in the traveling direction,
3. The rotating shaft is provided at a position deviated from the position on the base plate corresponding to the center of gravity in the direction of the traveling wheel, and the traveling wheel is floated by adjusting the height of the rotating shaft so that a fixed point can be rotated. 4 turning device.

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