KR100922854B1 - Having a suspention the caster - Google Patents

Abstract

The present invention relates to a caster installed in a transport trolley, and in particular, by stacking buffer pads of a soft material having different hardness on the caster, the buffer pad can be completely absorbed large and small vibration or shock quality of the caster device And it relates to a caster with a suspension device to maximize the reliability.

The main features of the present invention,

A fixed plate screwed to the bottom of the trolley; A main bracket rotatably assembled about the z-axis of the fixing plate; A central portion is coupled to the main bracket by the pin is capable of shiso-so movement, the wheel is installed on one side, and the other side is composed of an auxiliary bracket elastically supported by the buffer member, the buffer member between the auxiliary bracket and the main bracket A caster formed by stacking at least two buffer pads made of rubber or urethane having different hardnesses;

The buffer pad may include a first buffer pad positioned at the top, a second buffer pad positioned below the first buffer pad, and a third buffer pad positioned below the second buffer pad. 3, the hardness of the buffer pad is the largest, and then the hardness is configured in the order of the first buffer pad and the second buffer pad, the first, the first, second, third buffer pads are more unevenly coupled It is to include.

Casters, Shock Absorbers, Suspensions, Rubber, Urethane

Description

Caster with suspension {Having a suspention the caster}

The present invention relates to a caster installed in a transport trolley, and in particular, by stacking buffer pads of a soft material having different hardness on the caster, the buffer pad can be completely absorbed large and small vibration or shock quality of the caster device And it relates to a caster with a suspension device to maximize the reliability.

As is known, a caster is installed underneath a transport trolley (abbreviated as 'bogie') to collectively refer to one wheel and its peripheral components associated with the wheel so that the trolley can be moved quickly and easily.

Among the casters proposed these days, the cushioning caster is provided with an elastic body between the trolley and the caster, so that vibrations or shocks generated during operation of the trolley are absorbed, thereby preventing damage to the package mounted on the trolley.

In the past, the elastic body used only metal coil springs, but when the coil springs were suspended, noise problems occurred due to collisions with surrounding metal bodies. Has been raised.

Recently, a combination of coil springs and urethane has been proposed to compensate for this. One example is as follows.

As shown in Figures 1 to 3, the conventional cushioning caster is a fixed plate (1) screwed to the lower portion of the bogie (not shown), the front and rear open type of rotatable assembly around the z-axis of the fixing plate Main bracket (3), a central portion (pin) is coupled to both sides of the main bracket (pin), one end of the wheel (7) is rotatably installed, the other side of the auxiliary bracket is elastically supported by the buffer member (9) It consists of (5).

Here, the conventional buffer member 9 is a rubber or urethane material of the first elastic body (9a) to be fitted to the U-shaped auxiliary bracket (5), and each groove (9b) formed in the lower portion of the first elastic body It consists of the some 2nd elastic body 9c embedded in the inside.

The first elastic body 9a is made of soft material, and the second elastic body 9c is made of metal coil spring. When the vibration and impact occur, the first elastic body 9a primarily buffers the first elastic body. When the elastic body 9a reaches the buffering limit point, vibration and shock are transmitted to the second elastic body 9c, and the first and second elastic bodies 9a and 9c are buffered by interaction.

However, the conventional shock absorbing member 9 has a limit in mitigating vibration and shock since the second elastic body 9c is a coil spring.

For example, in the case of a coil spring having a small elasticity, when the vertical load applied thereto is greater than the elastic modulus of the coil spring, since the vertical load is applied to the coil spring and the elastic movement is performed, the coil spring may exhibit the damping effect of vibration and shock. If the coil spring is smaller than the modulus of elasticity, the vertical load is applied to the coil spring so that the elastic motion cannot be performed. Therefore, the damping effect of vibration and shock cannot be exhibited.

Therefore, when driving with the vehicle empty or when a light package is loaded, primary buffering by the first elastic body 9a is possible, but the second damping capacity of the second elastic body 9c is weak. Seen there is a problem that the buffer capacity is significantly lowered.

On the other hand, the soft spring coil springs can be elastically moved even under a small vertical load, so the damping effect of vibration and shock will be great when the truck is transported empty or when a light package is loaded. If the load is large, it is out of the elastic limit has a problem that does not properly exhibit the damping effect.

In addition, the coil spring has a larger repulsive force than other elastic bodies, so that another vibration occurs on its own. Of course, it cannot be denied that the first elastic body 9a acts to attenuate the vibration of the coil spring itself. However, the coil spring has a larger elastic force than the first elastic body 9a, thereby completely damping the spring vibration. Can't.

Therefore, the coil spring has its own element that causes secondary vibration, so it is difficult to see the effect of reducing vibration and shock completely.

In addition, since the bottom of the coil spring is in direct contact with the metal main bracket 3, the coil spring becomes a noise source due to the collision and friction between the coil spring and the main bracket during shock absorbing, and thus acts as a factor of degrading product quality and reliability. Has been.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, the main object of the present invention is to exclude the coil spring and to configure a plurality of buffer pads consisting of only a soft rubber or urethane to be laminated, vibration and shock It is to provide a caster having a suspension that can be mitigated, the suspension is fully cushioned because secondary vibration is not generated during the mitigation process.

The main features of the present application,
A fixed plate screwed to the bottom of the trolley; A main bracket rotatably assembled about the z-axis of the fixing plate; A central portion is coupled to the main bracket by the pin is capable of shiso-so movement, the wheel is installed on one side, and the other side is composed of an auxiliary bracket elastically supported by the buffer member, the buffer member between the auxiliary bracket and the main bracket A caster formed by stacking at least two buffer pads made of rubber or urethane having different hardnesses;
The buffer pad may include a first buffer pad positioned at the top, a second buffer pad positioned below the first buffer pad, and a third buffer pad positioned below the second buffer pad. 3, the hardness of the buffer pad is the largest, and then the hardness is configured in the order of the first buffer pad and the second buffer pad, the first, the first, second, third buffer pads are more unevenly coupled It is included.

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The present invention is capable of absorbing large and small vibrations and shocks by applying a buffer pad, which is a soft material, as a cushioning material, and of course, the shock absorbing pad has little elasticity and thus is very effective in vibration dampening. Thus, it is possible to obtain a subsequent effect of improving the quality of the caster and the reliability of the product.

The present invention relates to a caster having a suspension device, the specific configuration of which is as follows.

The caster of the present invention has a fixing plate 10 screwed to the lower portion of the trolley as shown in Figures 4 to 7, the main bracket 20 is rotatably assembled around the z-axis of the fixing plate 10 The main bracket 20 has a central portion coupled to the pin (P) is a state capable of seesaw movement, the wheel 40 is installed on one side, the other side of the auxiliary bracket elastically supported by the buffer member (50) It consists of what consists of 30.

From this, at least two or more buffer pads 52, 54, 56 having different hardnesses between the auxiliary bracket 30 and the main bracket 20 may serve as the cushioning member 50. It is laminated.

At this time, the buffer pads (52, 54, 56) is the first buffer pad 52 located at the top of the installation state, and the second buffer pad 54 located below the first buffer pad (52). ), It is preferably composed of a third buffer pad 56 positioned below the second buffer pad 54.

The first, second, and third buffer pads 52, 54, and 56 are unevenly coupled to each other to maintain a stacked state. Specifically, the fitting protrusion 54a is formed on the upper and lower surfaces of the second buffer pad 52, and the first buffer pad 52 and the third buffer pad 56 corresponding to the fitting protrusion 54a are provided on the fitting protrusion 54a. There are grooves 52a and 56a into which the fitting protrusions 54a are inserted, so that the protrusions 54a and 56a are coupled to each other.

Accordingly, the first, second, and third buffer pads 52, 54, and 56 can maintain a firmly coupled state without being separated from each other.

The first, second, third buffer pads (52, 54, 56) should not be separated from between the auxiliary bracket 30 and the main bracket 20, for this purpose, the first buffer pad 52 is the auxiliary bracket ( The stopper 32 formed at the end of the 30 is prevented from being separated, and the third buffer pad 56 forms a fitting protrusion 56b on the bottom thereof, and the bottom of the main bracket 20 corresponding thereto. A fitting hole 22 into which the fitting protrusion 56b is fitted is formed on a surface thereof.

The first to third buffer pads 52, 54, 56 have different hardness.

The hardness of the first buffer pad 52 is 61 ~ 70 (N / mm2) on the basis of Brinell hardness, the hardness of the second buffer pad 54 is also 50 ~ 60 (N / on the basis of Brinell hardness Mm 2), and the hardness of the third buffer pad 56 is 71 to 80 (N / mm 2) based on Brinell hardness.

The reason for the difference in hardness is to cause the buffer to proceed sequentially when vibration or shock occurs. If it is assumed that the hardness of each buffer pad is the same, three are compressed at a time when a load is applied to the shock absorber pad. Therefore, depending on the hardness, extreme compression (when hardness is low) or slight compression (high hardness) is required. Since the case occurs, proper hardness design is very difficult.

In order to buffer, the hardness of the cushion pad is not too hard or too hard to find an appropriate range, but it is not easy to find such an appropriate range, and the bigger problem is that when the buffer pad is light, it is difficult to buffer against high loads. If the buffer pad is hard, the buffering effect against the lowering is difficult, and the range of the buffer becomes very narrow.

However, when the hardness of each of the buffer pads is different, the second buffer pad 54 having the softest hardness acts as a buffer when the lowering load is applied, and when the load exceeds the elastic limit of the second buffer pad, the first buffer is applied. The buffer pad 52 and the second buffer pad 54 are mutually buffered, and when a load greater than or equal to the elastic limit of the first buffer pad 52 is applied, the first, second, and third buffer pads 52, 54, 56) the mutual buffering effect is possible to selectively buffer according to the low and high loads, and the range of the buffer is widened.

Since the first and second buffer pads 52 and 56 rub against the auxiliary bracket 30 and the main bracket 20 when the shock absorbing action is performed, the first and second buffer pads 52 and 56 have relatively harder hardness than the second buffer pad 54. Since the pad 54 may be damaged by the frictional force, the pad 54 is preferably positioned between the first and third buffer pads 52 and 56 to be protected.

The first to third buffer pads 52, 54 and 56 have no problem because their upper and lower surfaces and the left and right surfaces are surrounded by the auxiliary bracket 30 and the main bracket 20, but the front and rear surfaces are exposed to the outside. Because of this, it can be easily corroded by sunlight.

In order to prevent this, the sunscreen 58 is applied to at least front and rear surfaces of the buffer pads 52, 54, and 56 to prevent corrosion by sunlight to prolong life. Alternatively, before molding the buffer pads 52, 54, 56, the same effect can be obtained by incorporating a sunscreen into the rubber or urethane as a raw material and then molding the buffer pads.

On both inner surfaces of the main bracket 20, an overcompression prevention jaw 24 for preventing overcompression of the buffer pads 52, 54, and 56 by limiting a rising position of the wheel mounting end side of the auxiliary bracket 30 ) Is provided.

When transporting a package with a proper amount or more in the trolley, the load of the package is transferred to the buffer pads 52, 54, 56 as it is. If the load is outside the elastic limit of the buffer pads 52, 54, 56, the buffer pad. Since the plastic deformation causes end of life, it is necessary to prevent burnout of the shock absorbing pads 52, 54, and 56 due to excessive load, so that the overcompression prevention jaw 24 is the shock absorbing pads 52, 54, 56. It is a protection measure to prevent the burnout of).

1 is an exploded perspective view of a conventional buffer caster

2 is an assembled perspective view of a conventional buffer caster

Figure 3 is a cross-sectional view of the buffer member of the conventional buffer caster

4 is an exploded perspective view of the caster according to the present invention;

5 is an assembled perspective view of the caster according to the present invention

Figure 6 is a sectional view of the suspension of the caster according to the present invention

7 is a cross-sectional view taken along line II of FIG. 5.

<Explanation of symbols for the main parts of the drawings>

24: overcompression prevention jaw 50: buffer member

52: first buffer member 54: second buffer member

56: third buffer member 58: sunscreen

Claims (6)

A fixed plate screwed to the bottom of the trolley; A main bracket rotatably assembled about the z-axis of the fixing plate; A central portion is coupled to the main bracket by the pin is capable of shiso-so movement, the wheel is installed on one side, and the other side is composed of an auxiliary bracket elastically supported by the buffer member, the buffer member between the auxiliary bracket and the main bracket A caster formed by stacking at least two buffer pads made of rubber or urethane having different hardnesses; The buffer pad may include a first buffer pad positioned at the top, a second buffer pad positioned below the first buffer pad, and a third buffer pad positioned below the second buffer pad. 3, the hardness of the buffer pad is the largest, and then the hardness is configured in order of the first buffer pad and the second buffer pad, The first, second, and third buffer pads are casters having a suspension, characterized in that it further comprises a combination of uneven. delete delete delete The method of claim 1, The buffer pad is caster having a suspension device, characterized in that the sunscreen is applied to the surface or mixed with the raw material of the buffer pad. The method of claim 1, Casters having a suspension device on both inner surfaces of the main bracket, an overcompression prevention jaw for preventing the buffer pad from being over-compressed by limiting the rising position of the wheel mounting end side of the auxiliary bracket.

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