JP4449034B2 - Caster production method - Google Patents

Description

The present invention relates to a method of manufacturing a caster that is used by being attached to the bottom of a transport device or various transport vehicles.

  Conventionally, this type of caster is, for example, as shown in FIG. 6, a wheel frame via a deep groove ball bearing 12 on the lower side of a pedestal 11 fixed to the bottom of a transportation device or various transport vehicles. It is assumed that 13 upper plates 13a are rotatably attached. In the figure, the base plate 11 and the inner ring 12a of the deep groove ball bearing 12 are fixed to the stopper shaft 14, and the upper plate 13a of the wheel frame 13 is attached to the bearing case 15 fixed to the outer ring 12b of the deep groove ball bearing 12. By fixing, the upper plate 13a of the wheel frame 13 is rotatably attached to the lower side of the base 11 via a deep groove ball bearing 12.

  That is, as shown in FIGS. 7 and 8, the conventional caster accommodates the deep groove ball bearing 12 in a long diameter portion 15a of a bearing case 15 made of a different diameter cylindrical body having a short diameter at the top and a long diameter at the bottom. The deep groove ball bearing 12 is fixed by bending the lower end of the long diameter portion 15a. Then, the short diameter portion 15b of the bearing case 15 is protruded from the through hole 16 formed in the upper plate 13a of the wheel frame 13, and the short diameter portion 15b of the bearing case 15 is bent, as shown in FIG. The bearing case 15 is fixed to the upper plate 13a of the wheel frame 13. Then, as shown in FIG. 6, the pedestal 11 is positioned above the inner ring 12a of the deep groove ball bearing 12, and the washer 17 is positioned below the inner ring 12a. By caulking the lower portion of the stop shaft 14, the base 11 and the inner ring 12 a of the deep groove ball bearing 12 are fixed to the stop shaft 14, and the upper plate 13 a of the wheel frame 13 rotates together with the outer ring 12 b of the deep groove ball bearing 12. I am doing so. The wheel 18 pivotally supported on the side plate 13b of the wheel frame 13 is turned by the rotation of the upper plate 13a of the wheel frame 13.

  However, since the conventional caster separates the wheel frame 13 and the bearing case 15 as described above, the number of parts increases and it takes time to mount the bearing case 15 to the wheel frame 13, which increases the cost. Had the problem of becoming.

  Furthermore, the conventional caster separates the wheel frame 13 and the bearing case 15 as described above, and the bearing case 15 is attached to the upper plate 13a of the wheel frame 13 by bending the short diameter portion 15b of the bearing case 15. Since it is fixed, the bending of the short diameter portion 15b is loosened due to long-term use, etc., and the fixed state between the wheel frame 13 and the bearing case 15 rattles. The plate 13a becomes difficult to rotate together with the outer ring 12b of the deep groove ball bearing 12, and the wheel 18 supported on the side plate 13b of the wheel frame 13 has a problem that it does not turn smoothly.

Therefore, the present invention solves the above-described conventional problems, and the wheel frame and the bearing case are integrated, the number of parts is not increased, the cost is not increased, and the bearing case is not rattled. It is intended to provide a caster manufacturing method in which the upper plate of the wheel frame does not become difficult to rotate, and the wheel pivotally supported on the side plate of the wheel frame smoothly turns. It was made as a purpose.

Therefore, the caster manufacturing method of the present invention forms the through hole 6 in the center of the upper plate 3a of the wheel frame 3, and the diameter of the through hole 6 is increased by extruding the upper plate 3a. A bearing case 5 is formed integrally with the wheel frame 3, the deep groove ball bearing 2 is accommodated in the bearing case 5, and the lower part of the outer ring 2 b of the deep groove ball bearing 2 is held around the enlarged diameter through hole 6. further drawing process the upper periphery of the bearing case 5, the Rukoto bending the throttle portion inward, to hold the upper portion of the deep groove ball bearing 2 of the outer ring 2b, and a deep groove ball bearing 2 as being fixed to the bearing case 5 Yes.

Since the present invention is configured as described above, the cost is not increased and the upper plate of the wheel frame does not become difficult to rotate, and is supported on the side plate of the wheel frame. As a result, the caster wheel can be turned smoothly, and a caster excellent in durability can be manufactured without generating noise.

Embodiments of a caster manufacturing method according to the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, the caster manufactured by the manufacturing method of the present invention has a wheel mounted on the lower side of a base 1 fixed to the bottom of a transportation device or various transport vehicles via a deep groove ball bearing 2. It is assumed that the upper plate 3a of the working frame 3 is rotatably attached.

In the caster manufacturing method of the present invention shown in the figure, the inner ring 2a of the pedestal 1 and the deep groove ball bearing 2 is fixed to the stop shaft 4, and the deep groove ball bearing 2 is attached to the bearing case 5 formed on the upper plate 3a of the wheel frame 3. By fixing the outer ring 2b, the upper plate 3a of the wheel frame 3 is rotatably attached to the lower side of the pedestal 1 via the deep groove ball bearing 2.

That is, in the caster manufacturing method of the present invention, first, as shown in FIG. 2, the through hole 6 is formed in the center of the upper plate 3a of the wheel frame 3, and as shown in FIG. By extruding the plate 3a, the diameter of the through hole 6 is increased and the bearing case 5 is formed. Next, as shown in FIG. 4, the deep groove ball bearing 2 is accommodated in the bearing case 5, and as shown in FIG. 5, the lower part of the outer ring 2 b of the deep groove ball bearing 2 is formed around the enlarged diameter through hole 6. Further, the deep groove ball bearing 2 is fixed to the bearing case 5 by holding the upper part of the outer ring 2b of the deep groove ball bearing 2 by drawing the periphery of the upper end of the bearing case 5 and drawing. As shown in FIG. 1, the pedestal 1 is positioned above the inner ring 2a of the deep groove ball bearing 2 and the washer 7 is positioned below the inner ring 2a. By caulking the lower portion of the stop shaft 4, the base 1 and the inner ring 2a of the deep groove ball bearing 2 are fixed to the stop shaft 4, and the upper plate 3a of the wheel frame 3 rotates together with the outer ring 2b of the deep groove ball bearing 2. I try to move. Therefore, the wheel 8 pivotally supported on the side plate 3b of the wheel frame 3 can turn by the rotation of the upper plate 3a of the wheel frame 3.

  In this case, since the deep groove ball bearing 2 has a groove in which neither shoulder of the inner ring 2a or the outer ring 2b is dropped, the rolling ball 9 has no gap between the inner ring 2a and the outer ring 2b. It will be held in a stable state. Further, the bearing case 5 in which the deep groove ball bearing 2 is accommodated is formed by extruding the upper plate 3a of the wheel frame 3, and is integrated with the wheel frame 3, so that the bearing case 5 is not stable. There is no such thing. Therefore, the upper plate 3a of the wheel frame 3 that rotates together with the outer ring 2b does not rattle and does not become difficult to rotate, and the wheel 8 that is pivotally supported on the side plate 3b of the wheel frame 3 is also provided. It will turn smoothly.

  In addition, in order to provide an arrangement space for the upper plate 3 a between the pedestal 1 and the deep groove ball bearing 2, a ring 10, which is separate from the pedestal 1, is interposed between the pedestal 1 and the deep groove ball bearing 2. However, as in the conventional caster shown in FIG. 6, it is also possible to provide an arrangement space for the upper plate 3a as a pedestal 1 provided with a downward flange portion.

It is a partial notch sectional view of the caster manufactured by the manufacturing method of this invention. In the manufacturing method of the caster of this invention, it is explanatory drawing which shows the state before forming a bearing case in the upper board of a vehicle frame. It is explanatory drawing which shows the state which formed the bearing case in the upper board of the frame for vehicles in the manufacturing method of the caster of this invention. In the manufacturing method of the caster of this invention, it is explanatory drawing which shows the state before adhering a deep groove ball bearing to a bearing case. It is explanatory drawing which shows the state which fixed the deep groove ball bearing to the bearing case in the manufacturing method of the caster of this invention. It is a partial notch sectional view of the caster manufactured with the conventional manufacturing method . It is explanatory drawing which shows the state which adheres a deep groove ball bearing to a bearing case in the manufacturing method of the conventional caster. In the conventional caster manufacturing method , it is explanatory drawing which shows the state before adhering the bearing case which fixed the deep groove ball bearing to the upper board of a vehicle frame. In the conventional caster manufacturing method , it is explanatory drawing which shows the state which fixed the bearing case which fixed the deep groove ball bearing to the upper board of the frame for vehicles.

1 Base 2 Deep Groove Ball Bearing 2a Inner Ring 2b Outer Ring 3 Wheel Frame 3a Upper Plate 5 Bearing Case
6 holes

Claims (1)

A through hole (6) is formed in the center of the upper plate (3a) of the wheel frame (3), and the upper plate (3a) is extruded to increase the diameter of the through hole (6). The bearing case (5) is formed integrally with the frame (3), the deep groove ball bearing (2) is accommodated in the bearing case (5), and the deep groove ball bearing ( holding the bottom of the outer ring of 2) (2b), and further narrow the upper periphery of the bearing case (5) working by Rukoto bending the throttle portion on the inner side, deep groove ball bearing (2) outer ring (2b) A caster manufacturing method , characterized in that the upper groove is held and the deep groove ball bearing (2) is fixed to the bearing case (5).

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