JP3074015U - Box casters - Google Patents

Abstract

(57) [Summary] [Problem] To provide a caster for a box-shaped object, in which noise generated during use is reduced and manufacturing cost is reduced. A caster for a box-shaped object has a positioning pedestal attached to the box-shaped object, a roller pedestal on the bottom surface of the positioning pedestal, and rotates with the positioning pedestal. The roller 40 is attached to the roller pedestal 30,
The hard sphere pedestal 50 is located between the positioning pedestal 20 and the roller pedestal 30, and reduces the frictional force when the positioning pedestal 20 and the roller pedestal 30 rotate. The rigid sphere pedestal 50 has a flat and circular shape, and has a plurality of holes 52 formed at regular intervals so that the same number of rigid spheres 54 can be placed thereon. Between each hole 52 is a spherical projection 56. Therefore, when the roller pedestal 30 rotates with respect to the positioning pedestal 20, the noise can be significantly reduced, and the overall manufacturing cost can be reduced.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a caster for a box-shaped object such as a trunk.

[0002]

[Prior art]

 A general box-shaped caster sold in the market is, for example, as shown in FIG. 1 and includes a positioning pedestal 2, a rigid ball pedestal 3, a roller pedestal 6, and a roller 7, and a user pulls a heavy box-shaped object. In some cases, the caster 1 makes a loud noise, which gives the user discomfort and draws the attention of others. There are two main causes of the noise, one is the noise of friction between the roller 7 and the mandrel 8 when the roller 7 rotates, and the other is when the roller pedestal 6 rotates with respect to the positioning pedestal 2. The sound of the hard ball pedestal 3 between the two due to friction with them. The hard sphere pedestal 3 has a function of reducing the frictional force between the roller pedestal 6 and the positioning pedestal 2, but when the hard sphere 4 rotates, the friction generated between the hard sphere 4 and the main body 5 is a main cause of generating noise.

[0003]

[Problems to be solved by the invention]

 Accordingly, a main object of the present invention is to provide a caster for a box-shaped object with reduced noise generated during use. Another object of the present invention is to provide a caster for a box-shaped object having a reduced manufacturing cost.

[0004]

[Means for Solving the Problems]

 To achieve the above object, the caster for a box-shaped object of the present invention has a positioning pedestal attached to the box-shaped object, and the roller pedestal is on the bottom of the positioning pedestal, and rotates with respect to the positioning pedestal. I do. The roller is mounted on the roller pedestal, and the hard sphere pedestal is located between the positioning pedestal and the roller pedestal, and reduces the frictional force when they rotate. The hard sphere pedestal is flat and circular, with several holes at regular intervals so that the same number of hard spheres can be placed, with at least one spherical projection between each hole. is there. Therefore, when the roller pedestal rotates with respect to the positioning pedestal, the noise can be greatly reduced, and the total manufacturing cost can be reduced.

[0005]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 2 to 4 show an embodiment of the present invention. In this embodiment, the box-shaped object caster 10 is attached to the box-shaped object, and the positioning pedestal 20, the roller pedestal 30, the roller 40 and the rigid ball pedestal 50 are provided. It consists of The positioning pedestal 20 is attached to a box-shaped object, and has a circular recess 22 in a concave portion on the bottom surface thereof, and a hole 24 in the center of the recess 22.

The roller pedestal 30 has a circular head 32, which fits into the recess 22 of the positioning pedestal 20. The two wing portions 36 extend downward from the head 32, respectively, in particular, there is a circular recess 33 in the recessed portion of the head 32, and a hole 34 in the center of the recess 33, The hole 34 corresponds to the hole 24 of the positioning pedestal 20. The positioning pedestal 20 and the roller pedestal 30 are connected by the connecting members 35 and 38, and relatively rotate. The wings 36 each have a hole 37.

[0007] A shaft hole 42 is provided at the center of the roller 40, and the roller 40 and the roller pedestal 30 are integrally connected by passing the connecting member 44 through the shaft hole 42 and the hole 37. The hard sphere pedestal 50 is placed in the depression 33 of the roller pedestal 30, and the head 32 of the roller pedestal 30 is matched with the recess 22 of the positioning pedestal 20. In order to reduce the frictional force when the roller pedestal 30 rotates with respect to the positioning pedestal 20, in particular, the rigid sphere pedestal 50 has a flat and circular shape, and is formed by integral punching of plastic as shown in FIG. Has six holes 52 at equal intervals so that six hard spheres 54 can be placed. There are six spherical protrusions 56 between the holes 52, and the diameter of the protrusion 56 is slightly smaller than the diameter of the rigid sphere 54.

Therefore, when the roller pedestal 30 rotates with respect to the positioning pedestal 20, the rigid sphere pedestal 50 not only reduces the frictional force between the two but also has a smaller number of rigid spheres than the general one, so that the rigid sphere 54 When moving, the sound generated by friction with the ball base 50 is greatly reduced. Further, the support of the protruding portion 56 can efficiently reduce the frictional force when the roller pedestal 30 rotates with respect to the positioning pedestal 20. Furthermore, by reducing the number of hard spheres, not only the time for mounting the hard sphere pedestal is shortened, but also the cost of the component parts is reduced, and the object of the present invention is achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an exploded state of a conventional caster for a box-shaped object.

FIG. 2 is a perspective view showing a box-shaped caster according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of the box caster according to the embodiment of the present invention;

FIG. 4 is a sectional view showing a caster for a box-shaped object according to an embodiment of the present invention.

FIG. 5 is a perspective view showing an exploded state of the rigid ball base according to the embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Caster for box-shaped object 20 Positioning pedestal 30 Roller pedestal 40 Roller 50 Rigid sphere pedestal 52 Hole 54 Rigid sphere 56 Projecting part

Claims (7)

[Utility model registration claims] A positioning pedestal mounted on a box-shaped object; a roller pedestal mounted on a bottom surface of the positioning pedestal and rotating with respect to the positioning pedestal; a roller mounted on the roller pedestal; It is mounted between the positioning pedestal and the roller pedestal to reduce the frictional force when rotating with respect to the positioning pedestal, has a flat and circular shape, and has holes formed at predetermined intervals at an upper portion thereof. And a rigid sphere pedestal in which a rigid sphere is provided, and a spherical projection is provided between the holes, and a caster for a box-shaped object. 2. The box shape according to claim 1, wherein the roller pedestal has a head, and the positioning pedestal has a recess on a bottom surface used for connecting the hard sphere pedestal and the head. Casters for goods. 3. The positioning pedestal has a hole in the center, the roller pedestal has a hole corresponding to the hole of the positioning pedestal, and is integrally connected to the positioning pedestal by a connecting member. The caster for a box-shaped object according to claim 2, characterized in that: 4. The roller pedestal has two wings,
3. The caster according to claim 2, wherein the wings extend downward and are connected to the rollers. 5. The caster for a box-shaped object according to claim 1, wherein the diameter of the protruding portion is smaller than the diameter of the hard sphere. 6. The caster for a box-shaped object according to claim 1, wherein the number of projecting portions and holes of the rigid ball base are the same, and the projecting portions are provided between the holes. 7. The caster for a box-shaped object according to claim 1, wherein the rigid sphere pedestal is made by integral stamping of plastic.