JPS6018965Y2 - caster drum - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention is a caster drum that is attached to the underside of a trolley used for transporting heavy objects in factories, etc., and has a pair of U-shaped cross sections with a bearing mounting hole in the center. The present invention relates to a caster drum consisting of two drum bodies, each of which has horizontal portions formed on the circumferential side of each drum body that are fitted into each other.

Conventional technology Caster drums belonging to the above field were developed in the 1970s.
The one described in Japanese Patent No.-155751 is known.

FIG. 1 shows an outline of the structure of the above-mentioned prior art, which includes a pair of drum bodies A and A' each having a U-shaped cross section, and a substantially horizontal portion 13 formed on the circumferential side of each drum body A and A'. ．．
B' are fitted into each other, and a recess C is formed in the side wall of one drum body A.

By the way, in the above-mentioned conventional technology, when a heavy load is applied, the load is concentrated particularly at the center of the substantially horizontal portions B and B' of the circumference, so that the substantially horizontal portions B and B' become concave. Put it away.

As a result, the central part of the circumferential part is depressed and both ends are raised due to stress due to overload, resulting in two approximately water parts B,
There is a problem in that the welded parts of B' are deformed.

Moreover, in this way, the substantially horizontal portion 33. If both ends of B' are raised, running performance will be poor, and it will be particularly difficult to turn left and right.

This is the approximately horizontal portion 13. The height of the protrusion of B' is different on both sides,
As a result, the rotating wheel diameter differs over the entire width of the caster.

Problems to be Solved by the Invention The problem to be solved by the invention is to stabilize the running performance by making the structure of the horizontal part bear the load concentrated at the center of the circumferential part. It is.

Means for Solving the Problem The technical means of the present invention for solving this technical problem is to form a horizontal raised part having a slightly different diameter on the substantially middle part of the horizontal part through a restraining step part at the bottom. The horizontal part is formed continuously, and the end of the lower raised part abuts and restrains the inner wall of the restraining step of the upper raised part, and the end of the upper raised part is brought into contact with the outer wall of the restraining step of the lower raised part. This is to fit the protrusions on both sides so as to hug each other.

According to the above-mentioned technical means, a horizontal raised part having slightly different diameters is formed in the approximate center of the horizontal part and is continuous with the lower horizontal part through the restraining step part, and the end of the lower raised part is connected to the upper side. The caster drum The technical problem of the present invention described above is solved by being able to withstand the load that is concentrated on the center of the circumferential part, making the circumferential part concave, and preventing both ends of the circumferential part from rising up.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 2 to 4.

In FIG. 3, a drum body 2 having a U-shaped cross section has a bearing mounting hole 1 in the center, an inclined wall surface 9 on the periphery of the mounting hole 1, and a lower horizontal portion on the outer peripheral side of the inclined wall surface 9. 7 are arranged in series, and a horizontal raised part 4 is provided at the end of this lower horizontal part 7 via a restraining step part 5.

On the other hand, the drum main body 2a having a U-shaped cross section has a bearing mounting hole 1a in the center, and an inclined wall surface 9a is formed on the periphery of the mounting hole 1a.
A lower horizontal portion 7a is connected to the outer peripheral side of the inclined wall surface 9a, and a horizontal raised portion smaller in diameter than the raised portion 4 is provided at the end of the lower horizontal portion 7a via a restraining step 5. 4a is provided.

Thus, in the raised parts 4, 4a of the drum bodies 2, 2a, the ends of the lower raised parts 4a are connected to the restraining steps 5 of the upper raised parts 4.
The caster drum a is fitted with a double structure in such a manner that the end of the upper raised part 4 engages and hugs the outer wall of the restraining step part 5a of the lower raised part 4a.
form.

Incidentally, as shown in FIG. 4, the restraining step portion 5 may be bitten inward to hold and hold the tip of the raised portion 4a.

This allows the lower ram bodies 2, 2a to be more firmly and integrally integrated, and the inclined wall surfaces 9, 9 of the pair of drum bodies 2, 2a
Inwardly recessed grooves 8, 8a are formed approximately at the center of a.

10.10a is a bent portion formed at the periphery of the bearing mounting hole 1.1a.

11 is a bearing press-fitted into the mounting holes 1 and 1a, 1
2 is a shaft rod, and 13 is a tire portion made of rubber or synthetic resin fixed to the outer peripheral surface of the caster drum a.

However, since the present invention is manufactured by press-fitting and tightening a pair of pressed drum bodies 2 and 2a, the conventional complicated welding work is eliminated and mass production is possible. This makes it possible to significantly reduce costs.

In addition, when the conventional caster drum is used in a factory where heavy loads are applied or the floor surface is rough, the horizontal parts 7, 7a
The load concentrates on the center of the wheel, and the horizontal portion gradually becomes depressed, reducing driving performance.

However, in the present invention, the raised parts 4, 4a are provided, the end of the lower raised part 4a is abutted against the inner wall of the restraining step 5 of the upper raised part 4, and the end of the upper raised part 4 is restrained. Since both raised parts 4, 4a are fitted in such a way that they are tightly fitted to the outer wall of the restraining step part 5a of the lower raised part 4a, the horizontal parts 7, 7a are not depressed and the running performance is always good.

Furthermore, the recessed portions 8 of the pair of drum bodies 2, 2a,
Since the caster drum 8a is provided, it is strong against vertical pressure and the caster drum a does not tilt.

Furthermore, since the restraining step part 5 is bitten inward and engages and hugs the tip of the raised part 4a, there is no risk of it coming off even if a load is applied to it or if it receives a shock from driving on a rough road. It is sturdy and strong enough to withstand long-term use.

Also, since it forms a double structure, the metal plate is different from the conventional 2.3r.
/r! The thickness can be reduced to a ratio of about 1.2 mm to n, and costs can be reduced.

Because of the pressure-fitting method, it is possible to manufacture products by applying plating to the drum bodies 2, 2a in advance and then press-fitting them.

Therefore, every corner of the inner surface of the drum body is plated beautifully, increasing its commercial value and providing excellent corrosion resistance.

Further, the restraining step portion 5 and the raised portion 4 bite into the tire portion 13, and the tire portion 13 is strongly brought into close contact with the caster drum a.

The effect of the invention is that a raised part is provided on the circumference of the pair of drum bodies,
It seems that the technical problem of the present invention, which is to withstand the load concentrated on the center of the circumference of the caster drum, can be solved even if the technical means of fitting these raised parts is taken. It cannot be said that it has sufficient durability when used on large trucks or on vehicles that travel on rough roads.

However, the present invention consists of a pair of drum bodies each having a U-shaped cross section with a bearing mounting hole in the center, and horizontal parts formed on the circumferential side of each drum body are fitted together. In this caster drum, horizontal raised parts having slightly different diameters are formed in the middle of the horizontal part, and are continuous with the lower horizontal part through the restraining step part, and the end of the lower raised part is connected to the upper side. Since the raised portions were fitted against the inner wall of the restraining step of the raised portion and the end of the upper raised portion was hugged to the outer wall of the restraining stepped portion of the lower raised portion, it was possible to temporarily create a large truck. It has sufficient durability even when used for driving on rough roads and receives shocks, so it can be used for a longer period of time than conventional technology and can exhibit excellent running stability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional product, FIG. 2 is a perspective view of the present invention, FIG. 3 is a sectional view of the same, and FIG. 4 is a sectional view of another embodiment. 1... Mounting hole, 2, 2a... Drum body, 4゜4a... Protrusion, 5, 5a...
・Suppression step part, 7, 7a...Horizontal part, 8, 8a・
・・・・・・Recessed portion.

Claims (1)

[Scope of utility model registration request] In a caster drum consisting of a pair of drum bodies each having a U-shaped cross section with a bearing mounting hole in the center, and having horizontal parts formed on the circumferential side of each drum body fitted together, approximately in the middle of said horizontal part. Horizontal ridges with slightly different diameters are formed on the husband, each continuous with the lower horizontal part via a restraining step, and the end of the lower ridge collides with the inner wall of the restraining step of the upper ridge. At the same time, the caster drum is characterized in that both raised parts are fitted in such a way that the end of the upper raised part is hugged by the outer wall of the restraining step part of the lower raised part.