JP2001280419A - Vibration insulating palette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration insulating palette which enables delivering a prescribed vibration insulating capability precisely at all times irrespective of a mass variation of loading articles without requiring any manual adjustment work using a very ordinary elastic rubber body. SOLUTION: An elastic rubber body 8, which is a component of a vibration isolator 5 interposed between an upper plate 2 for loading and a lower plate 3 for grounding both of which are integral parts of a palette main body 1, is formed to have a configuration stepwisely varied in such a way that the contact area with the upper plate 2 is increased as the mass of the loading article is increased and is so structured that the spring rigidity of the vibration isolator 5 is automatically adjustable depending on the mass of loading article.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet used for transporting various goods and cargo handling work, and more particularly, to a pallet body from a cargo handling machine such as a transportation vehicle or a forklift during the transportation of goods or cargo handling work. The present invention relates to an anti-vibration pallet having a function of preventing an applied shock or vibration from being directly transmitted to a load and causing the load to resonate.

[0002]

2. Description of the Related Art This type of vibration isolating pallet is basically provided with a vibration isolating device made of a rubber elastic body between a loading upper plate and a grounding lower plate constituting a pallet body. For example, a rubber elastic body absorbs shocks and vibrations input to the lower plate of the pallet body from the vehicle side, etc., so that the shocks and vibrations are prevented from being transmitted to the load loaded on the upper plate. Have been.

In the vibration isolating pallet having the above-described basic structure, in order to exhibit a predetermined vibration isolating function irrespective of a change in the mass of the load, the spring rigidity of the rubber elastic body constituting the vibration isolating device must be reduced. It is desired to be adjustable according to the mass of the load. By providing a structure that can meet such demands, only one type of vibration-proof pallet can be prepared, and the vibration-proof pallet can be used for transporting cargoes of various sizes and masses and for cargo handling.

Meanwhile, as a vibration isolating pallet configured to be able to adjust the spring stiffness of a rubber elastic body, Japanese Unexamined Patent Publication No.
As disclosed in JP-A-91289, a variable spring stiffness mechanism using a screw structure composed of a bolt and a nut is interposed between an upper plate and a lower plate separately from a vibration isolator made of a rubber material. It has been known. Also,
As disclosed in JP-A-10-218182, a laminated rubber or a compression-type rectangular rubber is provided between an upper plate and a lower plate having two sides longer in the front-rear direction and / or the left-right direction than the upper plate. There is also known a structure in which an impact vibration absorber made of is interposed, and the impact vibration absorber is fastened to both upper and lower plates by a tightening force of bolts and nuts.

[0005]

However, in the vibration isolating pallet described in the former publication, the initial compression amount of the rubber material constituting the vibration isolating device is changed via a screw structure comprising a bolt and a nut in the variable mechanism. By adjusting the rigidity, the adjustment according to the mass of the load does not only require a great deal of trouble and trouble, but also the spring characteristics are not affected even if a cylindrical rubber material is used. 23, the spring rigidity cannot be adjusted steplessly.

On the other hand, in the vibration isolating pallet described in the latter publication, a laminated rubber obtained by alternately laminating and integrating a plurality of metal plates and a plurality of elastic plate materials is used as an impact vibration absorber (vibration isolator). However, since the spring constant in the shearing direction is small, when shock or vibration is applied, the amount of deformation in the front-back and left-right directions increases, the possibility of the load falling over is large, and the possibility of buckling is also increased. Because of this, there is a danger in transportation. Even if a general compression-type rectangular rubber is used, it is structurally very complicated to adjust the spring stiffness not only in the vertical direction but also in the front-rear and left-right directions according to the mass of the load. Therefore, it has not been possible to sufficiently meet a demand for exhibiting a predetermined vibration-proof function regardless of a change in the mass of the load.

[0007] The present invention has been made in view of the above circumstances, and uses an extremely general rubber elastic body, does not require any manual adjustment work, and is not affected by changes in the mass of the load. The main object of the present invention is to provide a vibration-proof pallet that can always exhibit a predetermined vibration-proof function.

It is another object of the present invention to provide an anti-vibration pallet which is excellent not only in the vertical direction but also in the front-back and left-right directions.

[0009]

In order to achieve the above-mentioned main object, a vibration isolating pallet according to the first aspect of the present invention comprises a rubber elastic between a loading upper plate and a grounding lower plate which constitute a pallet body. A vibration isolating pallet including a vibration isolating device made of a body, wherein the rubber elastic body is changed stepwise so that the contact area with the upper plate increases as the mass of the load increases. It is characterized in that the vertical vibration stiffness of the vibration isolator can be automatically adjusted according to the mass of the load.

According to the first aspect of the present invention, as the mass of the load loaded on the upper plate of the pallet body increases, the contact area of the rubber elastic body with the upper plate increases stepwise. The vertical spring stiffness of the vibration isolator made of an elastic body is automatically adjusted according to the mass of the load, so that the natural frequency of the vibration system is kept almost constant regardless of the change in the mass of the load. Even if impacts or vibrations are applied during transportation during transportation or the like, it is possible to avoid the resonance of the load and reliably exhibit a predetermined vibration-proof function.

Further, the vibration isolating pallet according to the second aspect of the present invention
A vibration isolating pallet in which a vibration isolator made of a rubber elastic body is interposed between a loading upper plate and a grounding lower plate constituting a pallet body, wherein the rubber elastic body has a mass of a load. It is formed in a form that changes stepwise so that the contact area with the upper plate increases as the size increases, and the rubber elastic body of such a form is placed on a horizontal plane so that the spring ratio in the vertical direction and the front-back and left-right directions is almost equal. On the other hand, it is characterized in that it is configured to be able to automatically adjust the spring stiffness in the vertical direction and in the front-rear and left-right directions of the vibration isolator in accordance with the mass of the load.

According to the second aspect of the present invention having the above configuration,
Using a single type of vibration isolator, such as arranging the rubber elastic body that composes the vibration isolator at an angle with respect to the horizontal plane, and devising the position of the vibration isolator, it is possible to prevent vibration in response to changes in the mass of the load. The spring stiffness not only in the vertical direction but also in the front and rear and left and right directions is automatically adjusted, so that even if impact or vibration is applied from any direction during transportation, etc., the specified vibration proof function can be exhibited. It is possible.

Further, the vibration isolating pallet according to the third aspect of the present invention is a vibration isolating device in a vertical direction and a longitudinal and lateral direction comprising a rubber elastic body between a loading upper plate and a grounding lower plate constituting a pallet body. A rubber elastic body constituting the vibration isolator in the front-rear and left-right directions is formed in a cylindrical shape, and the rubber elastic body in the vertical direction is provided inside or outside the cylindrical rubber elastic body. A member that forms a sliding surface is disposed, and a piston-like member that slides vertically along the sliding surface of the member is connected to the upper plate side, and the piston-like member moves upward according to the mass of the load. By sliding in the vertical direction together with the plate, the contact area between the piston-like member or the vertical sliding surface forming member and the rubber elastic body in both vibration isolator devices is increased as the mass of the load increases. Is changed stepwise, and is characterized in that it is automatically adjustable configurations depending on the mass of each loading was vertical and the spring stiffness of the longitudinal and lateral of Ryobofu device.

According to the third aspect of the present invention, the piston-like member slides up and down in accordance with the mass of the load loaded on the upper plate of the pallet main body, whereby the piston-like member and the pallet move vertically. The contact area with the rubber elastic body constituting the vibration isolator and the contact area between the piston-like member or the vertical sliding surface forming member and the cylindrical rubber elastic body constituting the vibration isolator in the front-rear and left-right directions are: The spring stiffness of the vertical vibration isolator and the front-back and left-right anti-vibration devices is automatically adjusted according to the mass of the load, and changes so as to increase stepwise as the load mass increases. Due to this, the natural frequency of the vibration system is kept almost constant irrespective of the change in the mass of the load, and even if impact or vibration is applied from any direction during transportation, etc. Demonstrate function Possible it is. In particular, by using a piston-shaped member, it is possible to automatically adjust the spring stiffness in both the up-down direction and the front-rear and left-right directions almost proportionally while reducing the size of the entire vibration isolator.

In the first to third aspects of the present invention,
If the rubber elastic body is formed such that the contact area with the upper plate changes steplessly in accordance with the mass of the load, the adjustment of the spring stiffness against the change in the mass of the load can be finely adjusted to further improve the vibration isolation performance. However, the rubber elastic body may be formed in a form in which the contact area with the upper plate is changed stepwise.

In the first and third aspects of the present invention, the rubber elastic body and the upper plate and / or the lower plate constituting the vibration isolator are bonded and fixed on a surface inclined with respect to a horizontal plane. By doing so, when a load is applied, it is possible to prevent the adhesive peeling due to the concentration of stress on the bonding point between the two, and to strengthen the adhesive fixation between the rubber elastic body and the plate of the pallet body, Can be improved in durability.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view showing the overall structure of a vibration-isolating pallet according to the first invention. In FIG. 1, reference numeral 1 denotes a pallet body, and the pallet body 1 comprises a loading upper plate 2 and a grounding lower plate 3. The upper and lower plates 2 and 3 are formed in a substantially symmetrical shape by resin or wood, and have a comb-shaped projection from the surface facing each other toward the other side. 2A and 3A are integrally projected, and these projections 2A and 3A
A fork of forklift (not shown)
Is formed.

At the four corners and the center between the upper plate 2 and the lower plate 3 constituting the pallet body 1, vertical vibration isolators 5 are interposed. One of the structures as shown in the following Examples A to D is selectively used as the vertical vibration isolator 5.

Embodiment A: The vertical vibration isolator 5 in this embodiment A is applied to an upper mounting plate 6 and a lower plate 3 which are fixed in contact with the upper plate 2 as shown in FIG. A rubber elastic body 8 is sandwiched and fixed between the lower mounting plate 7 and the lower mounting plate 7 which is fixed in contact therewith. The rubber elastic body 8 is manufactured by dividing the rubber elastic body 8 into three pieces in the inside and outside directions.
Specifically, outside the solid rubber elastic body 8A which is the smallest in height (vertical dimension) h1 and located at the center, the heights h2 and h3 are made larger stepwise than the solid rubber elastic body 8A. By fitting the two cylindrical rubber elastic bodies 8B and 8C concentrically, as shown in FIGS. 3 and 4, the entire rubber elastic body 8 is moved upward as the mass of the load on the upper plate 2 increases. The contact area with the plate 2 is gradual (3
In this way, the spring stiffness in the vertical direction of the vibration isolator 5 can be automatically adjusted according to the mass of the load.

Embodiment B: The basic structure of the up-down anti-vibration device 5 in this embodiment B is the same as that of the embodiment A, and the difference is that, as shown in FIG. In the rubber elastic body 8 divided into pieces, the upper edge surface 8b of the cylindrical rubber elastic body 8B located in the middle in the inward and outward directions is changed from the upper edge surface 8c of the outermost cylindrical rubber elastic body 8C to the center solid. The rubber elastic body 8A is formed on a tapered surface that is inclined toward the upper end surface 8a of the rubber elastic body 8A so that the contact area of the rubber elastic body 8 with the upper plate 2 as a whole according to the mass of the load changes linearly and steplessly. Is a point.

Embodiment C: The basic structure of the up-down anti-vibration device 5 in this embodiment C is the same as that of the embodiment A, and the difference is that as shown in FIG. In the rubber elastic body 8 divided into pieces, the upper edge surface 8b of the cylindrical rubber elastic body 8B located in the middle in the inward and outward directions is changed from the upper edge surface 8c of the outermost cylindrical rubber elastic body 8C to the center solid. The rubber elastic body 8A is formed into a curved surface approximating to a quadratic formula over the upper end surface 8a of the rubber elastic body 8A, and the contact area of the rubber elastic body 8 with the upper plate 2 as a whole according to the mass of the load changes steplessly in a curve. This is the point formed in the form.

Embodiment D: The basic configuration of the vertical vibration isolator 5 in this embodiment D is the same as that of the embodiment A, and the difference is that, as shown in FIG. In the rubber elastic body 8 divided into pieces, the upper edge surface 8b of the cylindrical rubber elastic body 8B located in the middle in the inward and outward directions is changed from the upper edge surface 8c of the outermost cylindrical rubber elastic body 8C to the center solid. The rubber elastic body 8A is formed into a curved surface approximating a cubic expression over the upper end surface 8a of the rubber elastic body 8A, and the contact area of the rubber elastic body 8 with the upper plate 2 as a whole according to the mass of the load is changed steplessly in a curve. This is the point formed in the form.

In the embodiments B to D, the same or corresponding components as those in the embodiment A are denoted by the same reference numerals, and the description thereof is omitted. Further, when the mass of the load changes, The flexural deformation state of the rubber elastic body 8 is also substantially the same as in FIGS. Furthermore, in Examples A to D described above, the rubber elastic body 8 constituting the vertical vibration isolator 5 is described as being divided into three in the inward and outward directions, but is divided into four or more. It may be produced.

In the vibration isolating pallet according to the first aspect of the present invention including the vertical vibration isolating device 5 having the structure shown in the above-described embodiments A to D, the upper plate 2 of the pallet body 1 is provided.
The contact area of the rubber elastic body 8 with the upper plate 2 increases stepwise as the mass of the load loaded on the
The vertical spring stiffness of the vibration isolator 5 is automatically adjusted according to the mass of the load. Incidentally, FIGS. 8 to 1
1 is a vertical anti-vibration device 5 shown in the above-mentioned Examples AD.
FIG. 4 is a characteristic diagram of load-deflection and spring constant-deflection in the case of using A. As is clear from these characteristic diagrams, Example A
In any of the vibration damping devices 5 shown in FIGS. 1 to 4, the natural frequency of the vibration system is substantially constant irrespective of the change in the mass of the load by automatically adjusting the spring rigidity in the vertical direction according to the mass of the load. Therefore, even if shock or vibration is applied during transportation or the like, it is possible to avoid the resonance of the load and reliably exhibit a predetermined vibration-proof function.

Next, an anti-vibration pallet according to the second invention will be described. The anti-vibration pallet according to the second invention has the same overall configuration as the anti-vibration pallet according to the first invention shown in FIG. The specific structure of the vibration isolator 5 interposed at each of the four corners and the center is also the same as that shown in FIGS. 2 to 4, and is different from the first invention in that the vibration isolator 5 The point is that the arrangement posture for the upper and lower plates 2 and 3 is devised.

That is, as shown in FIG. 12 or 13, two pallets are provided at each of the four corners and the center of the pallet body 1.
One set of the vibration isolators 5 and 5 is used individually, and the two sets of the vibration isolators 5 and 5 are fixed to the upper plate 2 and the lower plate 3 via the specially-shaped mounting members 11 and 12 which can be fixed to the lower plate 3. The rubber elastic bodies 8, 8 constituting the vibration isolator 5, 5 are arranged at an inclination of 45 ° opposite to each other with respect to a horizontal plane so that the spring ratios in the up-down direction and the front-back and left-right directions are substantially equal. It was done.

According to the anti-vibration pallet according to the second aspect of the present invention, the springs of the anti-vibration devices 5, 5 in the vertical direction and in the front-rear, left-right directions according to the mass of the load on the upper plate 2. The stiffness will be adjusted automatically. Incidentally, FIG. 14 is a characteristic diagram of load-deflection and spring constant-deflection when a pair of two vibration-isolating devices 5 and 5 are arranged at an angle of 45 ° in opposite directions (the same characteristic in the vertical and horizontal directions). As is apparent from this characteristic diagram, the natural frequency of the vibration system changes due to the change in the mass of the load by automatically adjusting the spring stiffness in the vertical and longitudinal directions according to the mass of the load. Irrespective of this, even if impact or vibration is applied from any direction during transportation or the like during transportation and the like, it is possible to avoid the resonance of the load and reliably exhibit a predetermined vibration-proof function. In the above description of the vibration isolating pallet according to the second aspect of the present invention, a pair of two vibration isolating devices 5 and 5 are arranged in a reversely inclined posture. May be set as one set.

Next, an anti-vibration pallet according to the third invention will be described. The vibration isolating pallet according to the third aspect of the present invention has the same overall configuration as the vibration isolating pallet according to the first aspect of the present invention shown in FIG. The specific structure of the vertical vibration isolator 5 interposed at each of the four corners and the central part is also the same as that shown in FIG. In addition to the device 5, a vibration isolator 5 'in the front / rear and left / right directions is provided.
′ Is configured so that the spring stiffness in the up-down direction and in the front-rear direction and the left-right direction can be automatically adjusted according to the mass of the load, and specific structures therefor are described in Examples E to E described below. H is adopted.

Embodiment E In this embodiment E, as shown in FIG. 15, the upper mounting plate 6 of the vertical vibration isolator 5 shown in FIG. 2 is fixedly connected to the upper plate 2 of the pallet body 1. A tubular member 26 that is fixed to the lower end of the piston-like member 21 and forms a vertical sliding surface 25 is fixedly disposed on the lower mounting plate 7 on the outer peripheral portion of the vertical vibration isolator 5. In addition, a cylindrical rubber elastic body 23 constituting the vibration isolator 5 ′ in the front-rear and left-right directions is adhered and fixed to the rod portion 21 a of the piston-shaped member 21. A cylindrical sliding guide 24 made of a hard material, which slides up and down along a vertical sliding surface 25 formed by the cylindrical member 26, is fixed. Piston 2 with plate 2 When the cylindrical rubber elastic body 23 and the cylindrical sliding guide 24 slide vertically along the vertical sliding surface 25 of the cylindrical member 26, the piston rubber 21 and the rubber elastic body 8 are separated from each other. The contact area and the contact area between the tubular member 26 and the rubber elastic body 23 are changed stepwise so that the area increases as the mass of the load increases, and the vertical direction of the vibration damping devices 5 and 5 ′ and The spring rigidity in the front-rear and left-right directions can be automatically adjusted according to the mass of the load.

Embodiment F: The basic structure of a vertical vibration isolator 5 and a front-rear and left-right anti-vibration device 5 'in this embodiment F is the same as that of the embodiment E.
As shown in FIG. 16, a cylinder forming a vertical sliding surface 25 for the vertical rubber elastic body 23 and the piston-like member 21 constituting the front-back and left-right vibration isolator 5 ′ to slide in the vertical direction. In the embodiment F, the sliding member 26 is arranged concentrically with the rubber elastic body 8 so as to surround the outer peripheral portion of the rubber elastic body 8 constituting the vertical vibration isolator 5. The cylindrical member 26 forming the surface 25 is made of a hard material such as metal, and is interposed at the boundary between the rubber elastic bodies 8 and 23 located inside and outside to guide the piston-like member 21 to slide vertically. This is a structure which also serves as the sliding guide 24.
Reference numeral 22 denotes a cylindrical case fixed to the outer periphery of the cylindrical rubber elastic body 23.

Embodiment G: The basic structure of the up-down direction vibration isolator 5 and the front-back / left-right direction vibration isolator 5 'in this embodiment F is the same as that of the embodiment F.
As shown in FIG. 17, the outer peripheral surface 21 of the piston-like member 21 is
By forming irregularities in b, avoiding the entire contact between the piston-like member 21 and the cylindrical slide guide 24, the sliding amount of the piston-like member 21 with respect to the mass change amount of the load is increased, and the sliding motion is increased. This is to smoothen the piston-like member 21 during the sliding movement and to suppress the fluctuation.

Embodiment H: The basic structure of the vertical vibration isolator 5 and the front-back and left-right vibration isolator 5 'in this embodiment H is almost the same as that of the embodiment E, except for the differences. As shown in FIG.
The point that the outer diameter of the cylindrical rubber elastic body 23 constituting the '′ is increased, the outer diameter of the piston-like member 21 is correspondingly increased, and the outer peripheral surface 23a of the cylindrical rubber elastic body 23 is formed with irregularities. It is.

In the vibration-isolating pallet according to the third aspect of the present invention, which comprises the vertical and longitudinal and longitudinal and lateral vibration-isolating devices 5 and 5 'having the structure shown in the above-mentioned embodiments E to H, the pallet body 1 As the mass of the load loaded on the upper plate 2 increases, the contact area between the piston-like member 21 and the rubber elastic body 8 and the contact area between the piston-like member 21 or the cylindrical member 26 and the rubber elastic body 23 gradually increase. Thus, the vertical spring stiffness of the vibration isolator 5 and the longitudinal and lateral spring stiffness of the vibration isolator 5 'are automatically adjusted according to the mass of the load. Incidentally, the load-deflection characteristics and the spring constant-deflection characteristics applied to the vertical vibration isolator 5 shown in the above-described Examples EG are almost the same as those of the embodiment A, and the front-rear and left-right vibration isolator 5 is used. 19, the load-vertical deflection and the horizontal spring constant-vertical deflection characteristics in FIG. 19 are as shown in FIG. 19 to FIG. 21.
G, and any of the anti-vibration devices 5 and 5 ′ described in the embodiment H.
Also when using together, the natural frequency of the vibration system is kept almost constant irrespective of the change in the load by automatically adjusting the spring stiffness in the vertical direction and the front and rear and left and right directions according to the load's mass. Even if impact or vibration is applied from any direction during transportation or the like, it is possible to avoid resonance of the load and reliably exhibit a predetermined vibration-proof function. In particular, since the spring stiffness of the two vibration isolator devices 5 and 5 'is automatically adjusted at the same time by using the piston-like member 21, compared to the case where the vibration isolator devices are inclined as in the second aspect of the present invention. In addition, it is possible to automatically adjust the spring stiffness in the up-down direction and in both the front-rear direction and the left-right direction almost proportionally and appropriately while reducing the size of the entire vibration isolator and simplifying the structure.

In any of the first to third inventions, the rubber elastic body 8 constituting the vertical vibration isolator 5 is used.
It is preferable that the upper and lower mounting plates 6 and 7 respectively fixed to the upper and lower plates 2 and 3 of the pallet body 1 are bonded and fixed on a surface inclined with respect to a horizontal plane as shown in FIG. The adhesive fixation on the inclined surface as described above eliminates the stress concentration at the joint portion between the two when a load is applied, and can prevent the adhesive peeling due to the stress concentration. The durability of the vibration isolating pallet can be improved by strengthening the adhesive fixing with the lower mounting plates 6 and 7.

In the above embodiment, the pallet body 1 provided with the fork insertion port 4 has been modified from the transportation / loading pallet itself to the vibration-proof pallet according to the present invention. Current transport with mouth
An anti-vibration pallet that is used by being placed on a pallet for cargo handling, without a fork insertion port, and only the anti-vibration device 5 or 5, 5 'between the upper and lower plates 2, 3 constituting the pallet body 1. The present invention may be applied to a device in which is interposed.

[0036]

As described above, according to the first aspect of the present invention, the contact area of the rubber elastic body with the upper plate is changed stepwise according to the mass of the load loaded on the upper plate of the pallet body. Since the spring stiffness of the vertical vibration isolator is automatically adjusted, it is not necessary to manually adjust the spring stiffness through a screw structure or the like every time the mass of the load changes. The natural frequency of the vibration system is kept almost constant irrespective of the mass change of the pallet, and even if impact or vibration is applied to the pallet body during transportation or cargo handling work, the vibration of the load is prevented and the specified vibration isolation function is achieved. It can be surely demonstrated. As a result, there is an effect that, simply by preparing one type of anti-vibration pallet, the anti-vibration pallet can be effectively used for transporting cargoes of various masses and for cargo handling.

According to the second and third aspects of the present invention, the spring stiffness of the vertical vibration isolator and the longitudinal and lateral vibration isolator can be automatically adjusted in accordance with the mass of the load. It is possible, therefore, to keep the natural frequency of the vibration system almost constant irrespective of the change in the mass of the load and avoid the resonance of the load even if impact or vibration is applied from any direction during transportation etc. A predetermined vibration-proof function can be reliably exhibited. In particular, according to the third aspect of the present invention, the use of a single piston-like member makes it possible to automatically adjust the spring stiffness in the up-down direction, the front-rear direction, and the left-right direction almost proportionally and appropriately, respectively. This makes it possible to achieve high anti-vibration performance while ensuring safety during transportation and cargo handling work while reducing the size of the equipment.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing the overall configuration of a vibration-isolating pallet according to the first invention.

FIG. 2 is an enlarged longitudinal sectional view showing a specific structure of a vertical vibration isolator corresponding to Embodiment A in the vibration isolating pallet according to the first invention.

FIG. 3 is an enlarged vertical sectional view of a state in which a small load is loaded on the vertical vibration isolator corresponding to the embodiment A;

FIG. 4 is an enlarged vertical sectional view showing a state in which a large load is loaded on the vertical vibration isolator corresponding to the embodiment A.

FIG. 5 is an enlarged vertical sectional view showing a specific structure of a vertical vibration isolator corresponding to Embodiment B in the vibration isolating pallet according to the first invention.

FIG. 6 is an enlarged vertical sectional view showing a specific structure of a vertical vibration isolator corresponding to Embodiment C in the vibration isolating pallet according to the first invention.

FIG. 7 is an enlarged vertical sectional view showing a specific structure of a vertical vibration isolator corresponding to Embodiment D in the vibration isolating pallet according to the first invention.

FIG. 8 is a characteristic diagram of load-deflection and spring constant-deflection when a vertical vibration isolator corresponding to Example A is used.

FIG. 9 is a characteristic diagram of load-deflection and spring constant-deflection when a vertical vibration isolator corresponding to Example B is used.

FIG. 10 is a characteristic diagram of load-deflection and spring constant-deflection when a vertical vibration isolator corresponding to Example C is used.

FIG. 11 is a characteristic diagram of load-deflection and spring constant-deflection when a vertical vibration isolator corresponding to Example D is used.

FIG. 12 is an enlarged longitudinal sectional view showing an example of a specific structure and an arrangement of a vibration isolator in the vibration isolating pallet according to the second invention.

FIG. 13 is an enlarged vertical sectional view showing another example of the specific structure and arrangement of the vibration isolator in the vibration isolating pallet according to the second invention.

FIG. 14 is a characteristic diagram of load-deflection and spring constant-deflection by the vibration isolator of the vibration isolating pallet according to the second invention.

FIG. 15 is an enlarged vertical sectional view showing a specific structure of a vertical and front-rear / left-right anti-vibration device corresponding to Example E in the anti-vibration pallet according to the third invention.

FIG. 16 is an enlarged vertical sectional view showing a specific structure of a vertical and front-rear / left-right anti-vibration device corresponding to Example F in the anti-vibration pallet according to the third invention.

FIG. 17 is an enlarged vertical sectional view showing a specific structure of a vertical and front / rear / left / right anti-vibration device corresponding to Example G in the anti-vibration pallet according to the third invention.

FIG. 18 is an enlarged vertical sectional view showing a specific structure of a vertical and front-rear / left-right anti-vibration device corresponding to Example H in the anti-vibration pallet according to the third invention.

FIG. 19 is a characteristic diagram of load-deflection and horizontal spring constant-vertical deflection when a vertical and front / rear / left / right vibration isolator corresponding to Example E is used.

FIG. 20 is a characteristic diagram of load-deflection and horizontal spring constant-vertical deflection when a vertical and front-back / left-right vibration isolator corresponding to Example F is used.

FIG. 21 is a characteristic diagram of load-deflection and horizontal spring constant-vertical deflection when a vertical and front / rear / left / right vibration isolator corresponding to Example G is used.

FIG. 22 is a schematic side view showing a configuration of a bonding portion between a rubber elastic body and an upper and lower mounting plate of the vertical vibration isolator according to the first to third inventions.

FIG. 23 is a spring characteristic diagram of an anti-vibration device used for a conventional anti-vibration pallet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pallet main body 2 Upper plate for loading 3 Lower plate for grounding 5 Vertical vibration isolator 5 'Front-back and left-right vibration isolator 8 Rubber elastic body 21 Piston member 23 Cylindrical rubber elastic body 24 Cylindrical sliding guide

Claims (8)

[Claims] An anti-vibration pallet comprising a rubber elastic body interposed between a loading upper plate and a grounding lower plate constituting a pallet body, wherein the rubber elastic body is The spring stiffness in the vertical direction of the anti-vibration device is automatically adjusted according to the mass of the load by forming it in a stepwise manner so that the contact area with the upper plate increases as the mass of the load increases. An anti-vibration pallet characterized in that it can be configured. 2. The anti-vibration pallet according to claim 1, wherein the rubber elastic body is formed in a form in which a contact area with the upper plate is changed steplessly according to a mass of the load. 3. The vibration isolating pallet according to claim 1, wherein the rubber elastic body and the upper plate and / or the lower plate are bonded and fixed on a surface inclined with respect to a horizontal plane. 4. A vibration isolating pallet in which a vibration isolating device made of a rubber elastic body is interposed between a loading upper plate and a grounding lower plate constituting a pallet body, wherein the rubber elastic body comprises: It is formed in a form that changes gradually so that the contact area with the upper plate increases as the mass of the load increases, and the elastic ratio of the rubber elastic body of such a form in the vertical direction and the front-back and left-right directions is almost equal. And a spring stiffness in the vertical direction and the longitudinal and lateral directions of the vibration isolator can be automatically adjusted according to the mass of the load. Shake pallets. 5. An anti-vibration pallet in which a vertical and front / rear / left / right anti-vibration device comprising a rubber elastic body is interposed between a loading upper plate and a grounding lower plate constituting a pallet body. The rubber elastic body constituting the vibration isolator in the front-rear and left-right directions is formed into a cylindrical shape, and a member forming a vertical sliding surface is disposed inside or outside the cylindrical rubber elastic body, A piston-like member that slides vertically along the sliding surface of this member is connected to the upper plate side, and the piston-like member slides up and down with the upper plate according to the mass of the load. The contact area between the piston-like member or the vertical sliding surface forming member and the rubber elastic body in both vibration isolators is changed stepwise so that the area increases as the mass of the load increases. Up and down Direction and vibration isolation pallet characterized in that it automatically adjustable configurations depending on the mass of the longitudinal and lateral spring stiffness of each loading thereof. 6. A vertical elastic member of the piston-like member is provided between the cylindrical rubber elastic body and the piston-like member or the vertical-direction sliding surface forming member, which constitutes the vibration-reducing device in the front-back and left-right directions. The vibration isolating pallet according to claim 5, wherein a cylindrical sliding guide made of a hard material for guiding sliding is interposed. 7. A rubber elastic body constituting said vertical vibration isolator is formed in a form in which a contact area with an upper plate changes steplessly in accordance with a mass of a load. The anti-vibration pallet described in. 8. The rubber elastic body and the upper plate and / or the lower plate constituting the vertical vibration isolator are adhesively fixed on a surface inclined with respect to a horizontal plane.
8. The anti-vibration pallet according to any one of items 7 to 7.