JPH10166808A - Ball transfer provided with brake function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball transfer provided with a brake function and capable of setting the optional moving direction. SOLUTION: A ball transfer 1 can be relatively moved in relation to a floor surface 9 as if on a plane and is provided with a main body 2, a large ball 5, small balls 6 and a brake member 20. The large ball 5 is formed into a spherical shape and brought in contact with the floor surface 9. A plurality of small balls 6 are provided with the diameters smaller than the diameter of the large ball 5, can be moved on the outer peripheral surface of the large ball 5 while being rotated as the rotation of the large ball 5, and can support the large ball 5 to the main body 2. The brake member 20 can regulate the movement of all small balls 6 or a part of small balls 6, and at least one brake member is provided on the ball transfer 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a ball transfer.

[0002]

2. Description of the Related Art Conventionally, a ball transfer that can be moved in all directions relative to a ground contact surface and a placed object has been sold and used. This ball transfer has, for example, a structure as shown in FIG. The ball transfer 91 shown in FIG. 9 is employed, for example, as a wheel of an industrial trolley or the like that can freely move on the ground plane 99 in any direction. The large ball 95 is in contact with the ground surface 99, and the small ball 9
6 is the support member 94 and the large ball 9 according to the rotation of the large ball 95
5 while being rotated, it is supported by the main body 92 including the support member 94 and is rotatable in all directions. When the small ball 96 moves into the space 92a, the load is not applied, and the small ball 96 moves in the space 92a by gravity, and the space in which the small ball 96 is reduced (for example, opposite to the center axis 91a). Side). As a result, the small ball 96 is always supplied between the support member 94 and the large ball 95, and the large ball 95 is
2 can continue to rotate.

[0003]

When the above-described ball transfer is employed for the wheels, the ball transfer itself does not have a braking function, so that a brake device must be provided separately from the ball transfer. The advantage of a ball transfer as a wheel is that it can move in all directions, but in some cases, this may impair directional stability and become a disadvantage.

An object of the present invention is to provide a ball transfer having a brake function. Another object of the present invention is to provide a ball transfer that can limit a moving direction or can set an arbitrary moving direction.

[0005]

According to a first aspect of the present invention, there is provided a ball transfer which is movable in a plane relative to an object having an abutting surface, comprising a main body, a large ball, and a small ball. And a brake member. The large sphere has a spherical shape and is in contact with the contact surface of the object. There are a plurality of small balls, having a diameter smaller than the diameter of the large ball, capable of moving on the outer peripheral surface of the large ball while rotating according to the rotation of the large ball, and supporting the large ball on the main body. It is. The brake member is capable of restricting the movement of the small ball, and is provided at least one in the ball transfer.

In the ball transfer, a large ball is supported by a main body via a small ball, and the large ball is rotatable with respect to the main body by movement of the small ball. That is,
If there is no movement of the small ball, the large ball will not rotate. The ball transfer according to the present invention includes a brake member capable of restricting the movement of the small ball, and the brake can be applied by regulating the movement of the small ball with the brake member. Therefore, if the ball transfer according to the present invention is adopted as a wheel in a vehicle or the like, it is not necessary to provide a separate and independent brake device in the vehicle or the like since the ball transfer itself has a braking function.

[0007] The ball transfer according to the second aspect is the ball transfer according to the first aspect,
The main body has a case member and a support member. The case member has an opening, and a housing space is formed inside. The support member is arranged on the opposite side of the contact surface of the large ball with the object with the large ball. The large sphere is disposed in the opening of the case member. The small balls are stored in the accommodation space and are supplied between the large balls and the support member.

When the large ball is rotating with respect to the main body, the small ball between the large ball and the supporting member moves while rotating according to the rotation of the large ball, and the space between the large ball and the supporting member is moved. When it comes out, it is stored in the accommodation space. The small balls stored in the accommodation space are sequentially supplied between the large ball and the support member, and the large ball is always supported by the support member via the small ball. The ball transfer according to claim 3 is the ball transfer according to claim 2, wherein the support member has a curved support surface that supports the large ball through the small ball,
It is arranged in the accommodation space. Further, the brake member is movable in the accommodation space, and restricts the movement of the small ball by sandwiching the small ball with another member.

The supporting surface of the supporting member is curved so as to contact the outer peripheral surface of the small ball opposite to the contact surface with the large ball, and the small ball covers a part of the outer peripheral surface of the large ball. Support through.
Thus, the load or reaction force acting on the large ball from the object is supported, and the movement of the large ball in the sliding direction with respect to the main body can be restricted. In addition, here, by moving the brake member and holding the small ball between the brake member and another member, the movement of the small ball is regulated, and the rotation of the large ball is stopped to apply the brake.

[0010] When the brake is applied by the above means, the braking performance is affected by the frictional resistance between the small ball and the surface of the brake member in contact with the small ball. For this reason, it is desirable to apply a material having a large coefficient of friction to the contact surface of the brake member with the small ball, or to make a material having a large coefficient of friction for the material of the brake member that regulates the small ball. .

According to a fourth aspect of the present invention, in the ball transfer according to any one of the first to third aspects, a projection is formed on a surface of the brake member that contacts the small ball. Here, in view of the fact that the frictional resistance between the surface of the brake member that contacts the small ball and the small ball affects the braking performance, in order to increase this frictional resistance, the surface of the brake member that contacts the small ball is A projection is formed. With this projection, it is possible to more reliably restrict the movement of the small ball. The protrusion may be a rib provided on the contact surface, or may be a protrusion on the contact surface having irregularities.

According to a fifth aspect of the present invention, in the ball transfer according to any one of the first to fourth aspects, the brake member restricts movement of some small balls. Here, the brake member is not a member for stopping the rotation of the large ball, but a member for stopping the rotation of the large ball in a certain direction. That is, normally, the ball transfer is rotatable in all directions, but if the brake member according to the present invention is operated, only some of the small balls that can rotate the large ball in a certain direction are restricted from moving. Therefore, the large ball can rotate only in other directions, and the direction in which the ball transfer can move is limited. Thus, when a vehicle or the like provided with the ball transfer needs stability in the moving direction, directional stability can be easily ensured by operating the brake member.

A ball transfer according to a sixth aspect of the present invention is the ball transfer according to any one of the first to fifth aspects, further comprising a plurality of brake members having different positions of small balls for restricting movement. Here, it is possible to prevent the large ball from rotating in any direction by a combination of operations of a plurality of brake members,
It is also possible to rotate the large sphere only in an arbitrary direction. Of course, when not using the brake member,
The large ball is rotatable in all directions. As described above, in a vehicle or the like employing the ball transfer according to the present invention, the state in which the vehicle can move in all directions can be changed from a state in which the vehicle can be moved in all directions to a state in which the vehicle stops, changes the moving direction, fixes the moving direction, and the like. Operation becomes possible.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] FIG. 1 shows a ball transfer 1 according to one embodiment of the present invention. This ball transfer 1 is used in place of wheels of an industrial trolley (not shown) used for carrying luggage or the like in a factory.

The ball transfer 1 mainly includes a main body 2, a large ball 5, a plurality of small balls 6, and a brake member 20.
And The main body 2 mainly includes a bogie mounting portion 12,
A case member 3, a support member 4, a small ball holding member 10,
And a large ball holding member 11. Dolly mounting part 12
Is provided with a thread groove on the outer periphery, and is screwed into a lower part of the industrial trolley. Thereby, ball transfer 1
Is mounted on an industrial trolley.

The case member 3 is fixed to a lower portion of the bogie mounting portion 12, has a plurality of rod through-holes 3a provided at an upper portion, and has a lower portion that is not closed but an opening 3b. The inside of the case member 3 is a space. The support member 4 is arranged in a space inside the case member 3, and is fixed to the case member 3 by a fixing portion 4a formed at an upper portion. A contact portion 4b having a curved support surface 4c is formed below the support member 4. The distance between the outer peripheral end of the contact portion 4b and the inner peripheral surface of the case member 3 is
It has dimensions that small balls 6 described later can pass through,
It is approximately equal to the diameter of the small ball 6. The support surface 4c is a set of points that are equidistant (diameter of the small ball 6) from the outer peripheral surface of the upper portion of the large ball 5 described later.

The large sphere 5 is a spherical member and is grounded to a floor 9 such as a factory. The large ball 5 is arranged in the opening 3b, and the upper part of the large ball 5 is supported by the support member 4 via the small ball 6. The small ball 6 is a spherical member having a smaller diameter than the large ball 5, and is provided between the large ball 5 and the support member 4, between the small ball holding member 10 and the support member 4, and between the large ball 5 and the support member 4. It is arranged in a space surrounded by the case member 3 and a brake member 20 described below (hereinafter, referred to as a housing space 2a). However,
In the accommodation space 2a, small balls 6 are left with some space left.
Is stored.

The brake member 20 is connected to a rod 21 connected to a brake operation lever (not shown) operated by an operator of the industrial trolley, and to the case member 3 and the support member 4 which are arranged in the case member 3. And a regulating portion 22 which can be relatively moved in the vertical direction. The rod 21 passes through the rod through hole 3a of the case member 3. The restricting portion 22 has a restricting surface 22 a that can contact the small ball 6. The regulating surface 22a is a curved surface corresponding to the curved surface of the upper surface of the contact portion 4b of the support member 4. In addition, regulation surface 2
2a is provided with a friction facing, which increases the friction coefficient of the regulating surface 22a.

When assembling each of the above-described members into the ball transfer 1, the members are assembled with the top and bottom of FIG. 1 reversed. First, the brake member 20 is assembled into the case member 3, and then the fixing portion 4 a of the support member 4 is attached to the case member 3.
Fixed to Then, the small ball holding member 10 is set in a state where a predetermined number of the small balls 6 are put in the accommodation space 2a. Large ball 5
Is set on the support member 4 in an upside-down state after setting the small ball 6 on the support member 4. Finally, the large ball holding member 11 is mounted on the case member 3 by the mounting member 13. When this is turned upside down, the state shown in FIG. 1 is obtained. Here, since the inner diameter of the lower portion of the large ball holding member 11 is smaller than the diameter of the large ball 5, the large ball 5 and the like do not deviate from the ball transfer 1. When the large ball 5 is in contact with the ground, a predetermined gap exists between the large ball 5 and the large ball holding member 11 and the small ball holding member 10. That is, ball transfer 1
In the ground contact state, the large ball 5 supports the supporting member 4 via the small ball 6 both in the vertical direction and in the direction parallel to the floor surface 9.
Supported by

Next, the operation will be described. When moving an industrial trolley employing a plurality of, for example, four, ball transfers 1 as wheels, the brake member 20 is not operated, and the position of the brake member 20 is at the position shown in FIG. That is, the small ball 6 is in a state where it can freely move in the accommodation space 2a. Here, the large ball 5 is the main body 2
The industrial trolley moves by rotating while being supported by the trolley. When the large ball 5 rotates, each small ball 6 in contact with the upper outer peripheral surface of the large ball 5 rolls with respect to the support surface 4c of the support member 4. Then, it moves from between the large ball 5 and the support member 4 to between the small ball holding member 10 and the support member 4 and further to the accommodation space 2a. On the other hand, between the large ball 5 and the support member 4 at the rear in the moving direction of the industrial trolley, new small balls 6 are replenished from the accommodation space 2a. Thereby, the large ball 5 can continuously rotate with respect to the main body 2, and the industrial trolley can move.

Next, the operation for stopping the moving industrial trolley will be described. In the conventional industrial trolley, the ball transfer itself does not have a brake function, and a brake device is separately mounted on the industrial trolley, and the movement is stopped by the brake device.
Here, the brake member 20 is attached to the ball transfer 1.
Is provided, the ball transfer 1 itself has a braking function, and a conventional separate braking device is not required. When trying to stop the industrial trolley, the brake operating lever connected to the rod 21 is operated,
The brake member 20 is moved vertically downward with respect to the main body 2. Then, the regulating surface 22a of the brake member 20 comes into contact with the small ball 6, and the small ball 6 is brought into contact with the upper surface of the contact portion 4b.
2a. Thereby, the movement of the small ball 6 in the accommodation space 2a is prohibited, and accordingly, the small ball between the support member 4 and the small ball holding member 10 and between the support member 4 and the large ball 5 6 is also regulated. For this reason, the rotation of the large ball 5 stops due to the friction generated on the contact surface with each small ball 6, and the industrial trolley stops. Since the coefficient of friction of the regulating surface 22a is large as described above, a relatively small force is required to push the brake member 20 against the contact portion 4b of the support member 4. In this case, the friction coefficient of the regulating surface 22a is increased by mounting the friction facing.
By making the surface uneven, the regulation surface 2 for the small ball 6
The holding force of 2a may be increased.

[Second Embodiment] Instead of the brake member 20 used in the first embodiment, a brake member 30 shown in FIGS. 2 and 3 can be used. The brake member 30 includes a rod 31 connected to a brake operation lever (not shown) and a restricting portion 32 disposed in the case member 3 and capable of moving vertically relative to the case member 3 and the support member 4. It is configured. The rod 31 penetrates the rod through hole 3a of the case member 3. The restricting portion 32 has a restricting surface 32 a that can contact the small ball 6. The regulating surface 32a is a curved surface corresponding to the curved surface of the upper surface of the contact portion 4b of the support member 4. Regulation 3
8a is provided with eight ribs 33 protruding downward in the vertical direction.

When the industrial truck is to be stopped, a brake operating lever (not shown) connected to the rod 31 of the brake member 30 is operated to move the brake member 30 vertically downward with respect to the main body 2. . Then, the regulating surface 32a comes into contact with the small ball 6, and the small ball 6 is sandwiched between the upper surface of the contact portion 4b and the regulating surface 32a. Thereby, the movement of the small ball 6 in the accommodation space 2a is prohibited, and accordingly, the small ball between the support member 4 and the small ball holding member 10 and between the support member 4 and the large ball 5 6 is also regulated. For this reason, the rotation of the large ball 5 stops due to the friction generated on the contact surface with each small ball 6, and the industrial trolley stops. In addition, the rib 33 is provided on the regulating surface 32a, and the rib 33 bites into the gap between the small balls 6, so that the movement of the small balls 6 in the accommodation space 2a is more effectively regulated. Accordingly, a relatively small force is required to push the brake member 30 against the contact portion 4b of the support member 4.

Other configurations and operations are the same as those of the first embodiment. [Third Embodiment] By using the brake member 40 shown in FIGS. 4 and 5 in place of the brake member 20 used in the first embodiment, a function of applying a brake only in a certain direction is provided to the ball transfer 1. You can have.

The brake member 40 includes a rod 41 connected to an operation lever (not shown), and a disk portion 44 disposed in the case member 3 and capable of vertically moving relative to the case member 3 and the support member 4. And two partial regulating portions 45 arranged below the disk portion 44 and fixed to the disk portion 44. The rod 41 passes through the rod through hole 3a of the case member 3. The small ball 6
And a partial regulating surface 45a that can contact the surface. This partial regulating surface 45a is a curved surface corresponding to the curved surface of the upper surface of the contact portion 4b of the support member 4. Note that a space 46 is formed between the two partial regulating portions 45.

The other structure is the same as that of the first embodiment. The movement of the industrial trolley is the same as in the first embodiment. When prohibiting the movement of the industrial trolley in a certain direction and limiting the movable direction of the industrial trolley, the operating member (not shown) connected to the rod 41 of the brake member 40 is operated to operate the brake member 4.
0 is moved vertically downward with respect to the main body 2. Then, the partial regulation surface 45a comes into contact with the small ball 6 and a part of the small ball 6
Is sandwiched between the upper surface of the contact portion 4b and the partial regulating surface 45a. As a result, movement of some of the small balls 6 in the accommodation space 2a is prohibited, and accordingly, between the support member 4 and the small ball holding member 10 and between the support member 4 and the large ball 5 The movement of a small ball 6 is also restricted. However, even when a part of the small balls 6 are sandwiched between the upper surface of the contact portion 4b and the partial regulating surface 45a, the other small balls 6 are formed in the space 46 formed between the two partial regulating portions 45. You can move freely inside. Therefore, the small ball 6 between the support member 4 and the small ball holding member 10 and between the support member 4 and the large ball 5 can move in the longitudinal direction of the space 46. That is, the large ball 5 is
Only the longitudinal direction of the space 46 becomes rotatable with respect to the main body 2. Therefore, by operating the operation lever,
The moving direction of the industrial trolley is limited to the longitudinal direction of the space 46.

When the industrial trolley is stopped, each ball transfer 1 allows the rotation of the large ball 5 in a certain direction even when the brake member 40 is actuated. The truck cannot be completely stopped in all directions. That is, the longitudinal direction of the space 46 of the ball transfer 1 used as the front wheel of the industrial trolley and the longitudinal direction of the space 46 of the ball transfer 1 used as the rear wheel are set in different directions, and the brake of all the ball transfer 1 is set. , The industrial trolley can be completely stopped.

[Fourth Embodiment] A function of applying a brake to the ball transfer 1 by using the brake members 51 to 56 shown in FIGS. 6 and 7 instead of the brake member 20 used in the first embodiment. In addition, a function of applying a brake only in another direction except for a certain direction of the ball transfer 1 can be provided.

The brake members 51 to 56 are independent members having the same shape. These brake members 5
1 to 56 are six rods 51a to 56a (only the rod 52a is shown in FIG. 7) connected to a plurality of operation levers (not shown), and the case member 3 and the support member 4 are arranged in the case member 3. Regulating part 5 that can move relative to the vertical direction
1b to 56b (only the restricting portion 52b is shown). The restricting portions 51b to 56b are formed with restricting surfaces 51c to 56c that can contact the small balls 6. The regulating surfaces 51c to 56c are curved surfaces corresponding to the curved surfaces on the upper surface of the contact portion 4b of the support member 4.

The other structure is the same as that of the first embodiment. The movement of the industrial trolley is the same as in the first embodiment. When prohibiting the movement of the industrial trolley in a certain direction and restricting the movable direction of the industrial trolley, a plurality of operation levers are operated to move an appropriate brake member vertically downward with respect to the main body 2. Let it.
For example, when the brake members 51, 53, 54, and 56 are moved, the regulating surfaces 51c, 53c, 54c, and 56c
Is in contact with the small ball 6, and a part of the small ball 6 is sandwiched between the upper surface of the contact portion 4b and each of the regulating surfaces 51c, 53c, 54c, 56c. As a result, movement of some of the small balls 6 in the accommodation space 2a is prohibited, and accordingly, between the support member 4 and the small ball holding member 10 and between the support member 4 and the large ball 5 The movement of a small ball 6 is also restricted. However, a part of the small ball 6 is formed between the upper surface of the contact portion 4b and the regulating surfaces 51c, 53c, 54c, 56c.
The other small balls 6 can freely move in the space formed between the upper surface of the contact portion 4b and the regulating surfaces 52c and 55c even when the small balls 6 are sandwiched between the small balls 6 and the regulating surfaces 52c and 55c. Therefore, the small ball 6 between the support member 4 and the small ball holding member 10 and between the support member 4 and the large ball 5 can move in the direction connecting the brake member 52 and the brake member 55. it can. Therefore, by operating the plurality of operation levers, the moving direction of the industrial trolley is changed between the brake member 52 and the brake member 5.
5 is limited.

When stopping the industrial trolley, all of the brake members 51 to 56 are moved vertically downward with respect to the main body 2. Then, the movement of all the small balls 6 is restricted, the large balls 5 cannot rotate in any direction, and the industrial trolley stops completely. Here, the plurality of operation levers are manually operated, but the rods 51a to 56a of the brake members 51 to 56 are connected not to the operation lever but to a cylinder using air pressure or hydraulic pressure that can be controlled by a solenoid or the like. It can also be done. In this way, by using the control device, it is possible to limit the movement direction of the ball transfer 1 in various ways. Although six brake members 51 to 56 are employed here, the number can be increased or decreased as necessary.

[Fifth Embodiment] FIG. 8 shows a ball transfer 61 according to an embodiment of the present invention. The ball transfer 61 is installed on a plurality of foundations 69 in a factory, and is for moving the mounted object 70 by mounting the mounted object 70 on a plurality of ball transfer 61 arranged in front, rear, left and right. is there.

The ball transfer 61 mainly includes
It has a main body 62, a large ball 65, a plurality of small balls 66, and a brake member 80. The main body 62 mainly includes a case member 63 and a support member 64. The case member 63 includes a cover 67 and a holding member 68.
A circular opening 67a is provided in the upper part of the cover 67, and a plurality of bolt holes 67b are provided in the lower part. The cover 6 is secured by bolts passing through the bolt holes 67b.
7 is fixed to the base 69. The holding member 68 is a disk-shaped member, and is provided with a plurality of rod through holes 68a on an outer peripheral portion.

The support member 64 is disposed inside the case member 63. On the upper part of the support member 64, a curved support surface 64a is formed. The support surface 64a is a set of points at an equal distance (diameter of the small ball 66) from the outer peripheral surface of the lower portion of the large ball 65 described later. Large ball 65
Is a spherical member, which is disposed in the opening 67 a of the cover 67 and contacts the lower surface of the mounted object 70. The lower part of the large ball 65 is supported by the support member 64 via the small ball 66.

The small ball 66 is a spherical member having a smaller diameter than the large ball 65, and is provided between the large ball 65 and the support member 64.
Support member 64, large ball 65, and brake member 8 described later
0 (hereinafter, referred to as a housing space 62a)
And placed. However, the small balls 66 are stored in the accommodation space 62a with some space left. The brake member 80 includes a rod 81 connected to a brake operation lever (not shown) operated by an operator who moves the object 70.
And a restricting portion 82 disposed in the case member 63 and capable of moving relative to the case member 63 and the support member 64 in the vertical direction.
And The rod 81 passes through the rod through hole 68 a of the holding member 68 of the case member 63. Regulatory Department 8
2 is arranged in the accommodation space 62a.

Next, the operation will be described. When moving the object 70 on the ball transfer 61,
The brake member 80 is not operated. That is, the position of the brake member 80 is at the position shown in FIG. 8, and the small ball 66 is in a state where it can freely move in the accommodation space 62a. Here, the mounted object 70 moves as the large ball 65 rotates while being supported by the main body 62. When the large ball 65 rotates, each small ball 66 that is in contact with the lower outer peripheral surface of the large ball 65 rolls with respect to the support surface 64 a of the support member 64. And
It moves from the space between the large ball 65 and the support member 64 to the accommodation space 62a. On the other hand, a new small ball 66 is provided between the large ball 65 and the support member 64 in the forward direction of the mounted object 70 in the moving direction.
Replenished from. Thus, the large ball 65 can be continuously rotated with respect to the main body 62, and the mounted object 70 can be moved.

Next, the operation for stopping the moving object 70 will be described. In the conventional ball transfer, the ball transfer itself does not have a braking function, and a separate braking device is used.
The movement is stopped by this brake device. Here, since the ball transfer 61 is provided with the brake member 80, the ball transfer 61 itself has a braking function, and a separate conventional braking device is not required. When the object 70 is to be stopped, a brake operation lever (not shown) connected to the rod 81 is operated to move the brake member 80 vertically downward with respect to the main body 62. Then, the regulation unit 8
2 comes into contact with the small ball 66, and there is no space for moving the small ball 66 in the accommodation space 62a, and accordingly, the small ball 66 between the support member 64 and the large ball 65 moves. Be regulated. For this reason, the rotation of the large ball 5 stops due to the friction generated on the contact surface with each small ball 66, and the mounted object 70 that has moved stops.

[0038]

According to the present invention, since the ball transfer itself is provided with a braking function, it is not necessary to separately provide a brake device in a vehicle or the like employing the ball transfer. Further, in another aspect of the present invention, it is possible to set a moving direction of a vehicle or the like employing a ball transfer by employing a brake member capable of restricting the movement of some small balls.

[Brief description of the drawings]

FIG. 1 is a one-side cross-sectional view of a ball transfer according to an embodiment of the present invention.

FIG. 2 is a plan view of a brake member according to a second embodiment.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a plan view of a brake member according to a third embodiment.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

FIG. 6 is a plan view of a brake member according to a fourth embodiment.

FIG. 7 is a view taken in the direction of arrows VII-VII in FIG. 6;

FIG. 8 is a one-side sectional view of a ball transfer according to a fifth embodiment.

FIG. 9 is a one-side cross-sectional view of a conventional ball transfer.

[Explanation of symbols]

 1,61 Ball transfer 2,62 Main body 3,63 Case member 4,64 Support member 5,65 Large ball 6,66 Small ball 9 Floor surface (object) 20,30,40,51-56,80 Brake member 33 Rib (Protrusion) 70 Placement (object)

Claims (6)

[Claims] 1. A ball transfer which is relatively movable in a plane relative to an object having an abutting surface, comprising: a main body; a spherical large sphere abutting on the object; A plurality of spherical small balls having a diameter smaller than the diameter of the large sphere, which can move the outer peripheral surface of the large sphere while supporting the large sphere on the main body; Ball transfer comprising at least one brake member that can be regulated. 2. A case member having an opening and having a housing space therein, and a supporting member disposed on the opposite side of the large sphere from a contact surface of the large sphere with the object. The large ball is arranged in an opening of the case member, and the small ball is stored in the housing space, and is supplied between the large ball and the support member. 2. The ball transfer according to 1. 3. The support member has a curved support surface for supporting the large ball via the small ball, and is disposed in the storage space, and the brake member moves in the storage space. The ball transfer according to claim 2, wherein the ball transfer is possible, and the movement of the small ball is restricted by sandwiching the small ball with another member. 4. The ball transfer according to claim 1, wherein a projection is formed on a surface of the brake member that contacts the small ball. 5. The ball transfer according to claim 1, wherein said brake member regulates a movement of a part of said small ball. 6. The ball transfer according to claim 1, further comprising a plurality of brake members having different positions of small balls for restricting movement.