JPH08156753A - Pan assembly capable of oscillating - Google Patents

Abstract

PURPOSE: To safely and positively support a car body when the front part or the rear part of the car body is lifted up, by arranging and installing a means for turnably supporting a pan so that the pan can follow the angles of inclination of the car body, and a mean for stably supporting the pan at any angle of inclination. CONSTITUTION: In a pan assembly 100 capable of oscillating, pan 110 capable of oscillating has a car supporting part 150 at the upper peripheral edge part. A pan supporting means 120 supports the pan 110 around a turning-center shaft line 170 intersecting the longitudinal direction of a car body at right angles so that the pan can freely turn, and a bolt-nut 200 is penetrated through a through hole 180 in the direction of the turning-center shaft line 170 to turnably connect the pan 110 to a center pin 190. A pan stably holding means 130 receives the contact face 210 of a member 220 being guided, firmly installed on the undersurface of the pan 110 by the receiving face 230 of a guide member 240. A turning movement preventing means 140 has a locking surface 250 facing the receiving face 230, in succession to the contact face 210, and prevents the pan 110 from turning over a specified angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tray for supporting a vehicle body from below and lifting it, and more particularly to a tray which can be swung to follow the inclination angle of the vehicle body.

[0002]

2. Description of the Related Art As a tray for supporting a vehicle body from below and lifting it, there is known a tray used for a jack-up device or a car lift.
The jack-up device includes an elongated arm for insertion below the vehicle body, a jack arm having one end rotatably connected to the elongated arm and a jack arm for jacking up at the other end, and the jack arm pivoted upward to move the vehicle body. In the case of lifting the lower part of the vehicle body, for example, the front part at the front part or the rear part of the vehicle body, which has a turning drive means for lifting, a saucer is fixedly provided at the other end, and the saucer has a vehicle body supporting part formed on the upper part. Is closely attached to the mission unit and the like to support the weight of the vehicle body. On the other hand, the car lift is of a type in which a pan is moved up and down by a pantograph mechanism instead of a rotatable jack arm.

[0003]

However, in such a jack-up device or car lift,
The saucer is normally moved up and down by the parallel link arm and the pantograph mechanism, and the body support portion of the saucer is always kept horizontal with respect to the ground regardless of the turning angle of the jack arm. The horizontal saucer does not follow the angle change as the angle of inclination of becomes larger, and the contact area between the vehicle body and the body support part of the saucer gradually decreases, and the adhesion with the vehicle body is obstructed, and as a result, the body and the saucer It is easy for slippage to occur. In particular, the larger the angle of inclination, the more likely slippage occurs, which may cause a serious accident. Further, it is difficult to completely guarantee the levelness of the tray by the parallel link arm or the pantograph mechanism due to mechanical play, manufacturing error, etc. Therefore, the above problems are promoted. Therefore, in view of the above problems, a first object of the present invention is to provide a swingable tray assembly capable of supporting a vehicle body safely and surely. A second object of the present invention is to provide a jack-up device or a car lift equipped with the above-mentioned swingable tray.

[0004]

In order to achieve the above first object, in the swingable tray assembly of the first invention of the present invention, a vehicle body support portion is formed on the upper portion of While supporting the weight of the vehicle body from below the vehicle body at the front or rear,
In a tray for moving upward from a first vehicle body support position to a second vehicle body support position to lift a front portion or a rear portion of the vehicle body, the vehicle body support portion increases in the front-rear direction of the vehicle body as the vehicle body is lifted. A saucer support means for supporting the saucer rotatably about a rotation center axis line that is located below the saucer so as to follow an inclination angle across the axis and is substantially orthogonal to the front-rear direction of the vehicle body; To stably hold the tray at an arbitrary inclination angle formed when the tray supports the weight of the vehicle body and is located between the first vehicle body support position and the second vehicle body support position. And a means for stably holding the tray. Further, it is preferable that the tray further includes rotation preventing means for preventing the saucer from rotating more than an inclination angle at the second vehicle body supporting position.

Further, the receiving plate stabilizing means includes a guided member fixed to the receiving plate and having a contact surface facing downward, and a guide member having a receiving surface for receiving the contact surface. Consists of an arc surface centered on the center of rotation of the tray and extending substantially orthogonal to the axis of rotation, the receiving surface having a substantially smooth surface, according to the rotation of the tray, It is preferable that the receiving surface guides the tray by the frictional engagement of the arc surface continuously on the smooth surface. Alternatively, the tray stabilizing means has a guide member having a receiving surface facing upward for receiving a substantially smooth contact surface formed on the lower surface of the tray, the receiving surface being the rotation of the tray. Consists of an arc surface centered on the center and extending substantially orthogonal to the axis of rotation,
The contact surface may guide the saucer by frictionally engaging the contact surface on the arc surface in accordance with the rotation of the saucer. Furthermore, the rotation preventing means has a locking flat surface with respect to the receiving surface, which extends from at least one end of the contact surface so as to form a smooth continuous surface with the arc surface. The plane may form a predetermined angle with the receiving surface.

Alternatively, the rotation preventing means has a locking flat surface for the contact surface, which extends from at least one end of the receiving surface so as to form a smooth continuous surface with the arc surface. The locking plane preferably makes a predetermined angle with the contact surface. In this case, the predetermined angle may be an inclination angle of the vehicle body at the second vehicle body support position. Further, the saucer support means includes a center pin having a through hole in the direction of the rotation center axis and a bolt-nut for penetrating the through hole to rotatably connect the saucer and the center pin. It is good that Second above
In a jack-up device or a car lift according to a second aspect of the present invention, in order to achieve the above object, any one of the above-described swingable saucer assemblies and the saucer from the first vehicle body support position to the second vehicle body support position can be provided. It is configured to have a tray raising / lowering means for moving the vehicle up to the position and lifting the front portion or the rear portion of the vehicle body.

[0007]

According to the swingable tray assembly of the first aspect of the present invention, the weight of the vehicle body is supported from below by the vehicle body supporting portion formed on the upper portion of the tray, at the front portion or the rear portion of the vehicle body. Next, when the tray is moved upward from the first vehicle body support position to the second vehicle body support position and the front portion or rear portion of the vehicle body is lifted, the inclination angle of the vehicle body in the front-rear direction increases and the tray is the tray support means. Since it is positioned below the tray and is rotatably supported about a rotation center axis line that is substantially orthogonal to the front-rear direction of the vehicle body, it is possible to follow an increasing tilt angle, and as a result, The close contact between the vehicle body and the vehicle body support portion is maintained, and slippage between them can be prevented. Further, when the saucer supports the weight of the vehicle body, the saucer stable holding means stably holds the saucer at an arbitrary inclination angle formed when it is located between the first vehicle body support position and the second vehicle body support position. Therefore, the vehicle body can be supported safely and reliably. According to the jack-up device or the car lift of the second aspect of the present invention, it is possible to lift the vehicle body safely and surely by raising and lowering the swingable tray that supports the vehicle body safely and reliably by the tray raising / lowering means. It will be possible.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. First Embodiment (FIGS. 1 to 7) FIGS. 1 and 2 are respectively a perspective view and a side view of a swingable tray according to the first embodiment of the present invention. FIG.
FIG. 3 is an enlarged partial side view of a B part in FIG. 2. FIG. 4 is a schematic perspective view of a jack-up device including a swingable tray according to the first embodiment of the present invention. FIG. 5 to FIG. 7 are schematic views showing a usage state of the jack-up device including the swingable tray according to the first embodiment of the present invention. 1 and 2, reference numeral 100 denotes a swingable saucer assembly, and the swingable saucer assembly 100 includes a swingable saucer 110 and a saucer for rotatably supporting the shakeable saucer 110. It is roughly configured by a support means 120, a saucer stable holding means 130 for stably holding the saucer 110, and a rotation preventing means 140 for preventing the saucer 110 from rotating more than a predetermined angle. The swingable tray 110 is a conventionally well-known type, and has a vehicle body supporting portion 150 formed on an upper peripheral edge thereof to support the weight of the vehicle body from below the vehicle body at a front portion or a rear portion of the vehicle body from a first vehicle body supporting position. It is configured to move upward to the second vehicle body support position and lift the front portion or the rear portion of the vehicle body. The boat bottom type vehicle body support portion 150 has a protrusion 160 for preventing slippage with the vehicle body. Have.

The saucer supporting means 120 is located below the saucer 110, and is capable of rotating the saucer 110 about a rotation center axis 170 that is substantially orthogonal to the front-rear direction of the vehicle body as shown by the arrow in FIG. A center pin 190 that is configured to support and has a through hole 180 in the direction of the rotation center axis 170, and for rotatably connecting the tray 110 and the center pin 190 through the through hole 180. Bolt-nut 200 of FIG. Bolt
The guide pins 220 are installed on both sides of the center pin 190, which will be described later, penetrate through the through holes of the guided members 220 fixed to the tray 110, and are fastened by nuts on one guided member 220 side. As a result, as described later,
The vehicle body support portion 150 is adapted to follow an inclination angle in the front-rear direction of the vehicle body that increases as the vehicle body is lifted. Incidentally, when the swingable saucer assembly 100 is attached to an existing jack-up device or car lift, the tip of the center pin 190 is, for example, the through hole 28 of the parallel plate 270 at the upper end of the jack arm 260.
You can insert it into 0. When the tray 110 supports the weight of the vehicle body, the tray stable holding means 130 holds the tray 11
0 is configured to stably hold the tray 110 at an arbitrary inclination angle formed when 0 is located between the first vehicle body support position and the second vehicle body support position, and is fixed to the lower surface of the tray 110. And a guided member 220 having a contact surface 210 facing downward and a guide member 240 having a receiving surface 230 for receiving the contact surface 210.
The guided members 220 are spaced apart from each other by a predetermined distance in the direction of the rotation center axis 170 with the center pin 190 interposed therebetween.
It is arranged at two places on the lower surface of 0. The contact surface 210 is
In particular, as shown in FIG. 3, the receiving surface 230 has an arc surface centered on the rotation center of the tray 110 and extending substantially orthogonal to the rotation center axis 170, while the receiving surface 230 has a substantially smooth surface. Therefore, in response to the rotation of the tray 110, the arc surface continuously frictionally engages on the smooth surface, so that the receiving surface 23
0 guides the saucer 110. In addition,
The guided member 220 may be formed integrally with the tray 110. Further, when the swingable saucer assembly 100 is used in an existing jack-up device or car lift, a parallel plate provided on the upper end of the saucer lifting means such as a parallel link mechanism or a pantograph mechanism is used as the guide member 2.
It should be used as 30. As a result, it can be easily applied to an existing jack-up device or the like simply by replacing the old tray.

The guided member 220 receives the weight of the vehicle body via the pan 110 that can swing, and the contact surface 210 and the receiving surface 2
By directly transmitting to the guide member 240 by contact with 30, the shear load is not directly applied to the bolt-nut 200. The rotation preventing means 140 is
The engaging surface 250 is extended from both ends of the contact surface 210 so as to form a smooth continuous surface with the arc surface. The engaging surface 250 forms a predetermined angle α with the receiving surface 230. Therefore, when the tray 110 is rotated up to the predetermined angle α, the entire locking surface 250 is brought into contact with the receiving surface 230, so that the tray 110 can be prevented from further rotating. In this respect, it is convenient to set the predetermined angle α to the maximum inclination angle of the vehicle body. When the jack-up device described later is dedicated to lifting the front portion or the rear portion of the vehicle body, the locking surface 250 is the contact surface 21.
It only has to extend from one end of 0. next,
A jack-up device provided with such a swingable upper plate will be described with reference to FIG. In FIG. 4, reference numeral 10
Is a movable body jack, and a movable body jack 10
Is an elongated frame 12, a pair of front wheels 14 and a pair of rear wheels 16 respectively attached to the front and rear of the elongated frame 12, and one end thereof is rotatably attached to the elongated frame 12. A jack arm 18 that extends toward the front, a swing drive unit that swings the jack arm 18 upward, and a vertical movement roller 22 that is attached to the front end of the elongated frame 12.
The front wheels 14 are roughly constituted by front wheel moving means for moving the front wheels 14 along the longitudinal direction of the elongated frame 12.

The elongated frame 12 has a pair of longitudinal plates 24 connected at predetermined intervals, each longitudinal plate 24 having a slot 26 extending in the longitudinal direction.
Is formed, and an axle 28 of the front wheel 14, which will be described later, penetrates into the slot 26 so that the axle 28 can move in the longitudinal direction. A handle 60 extending obliquely upward is attached to the rear end of the elongated frame 12, and the handle 60 is connected to a pump lever (not shown) described later. The pair of front wheels 14 and the rear wheels 16 are of a conventionally well-known type, preferably made of urethane rubber, and attached to the elongated frame 12 so that their lower ends are at substantially the same level. Front wheel 1
The axle length of 4 is longer than that of the rear wheel 16, and is a length such that the stability of the vehicle body and the jack itself is sufficiently secured when the lifted vehicle body is moved as it is, for example, 800 mm.
Is. The front wheels 14 are moved from the first longitudinal position of the elongated frame 12 by the front wheel moving means described later,
The jack-up point can be moved to a second longitudinal position (see FIG. 7) that is forward of the projected position on the elongated frame 12. The jack arm 18
It is composed of a well-known parallel link mechanism, and the above-mentioned saucer assembly 100 is fixed to the upper end of the link so that the vehicle body support 150 is always kept parallel to the road surface by the turning of the jack arm 18 under no load condition. It has become.

The turning drive means (not shown) is composed of a well-known hydraulic drive circuit and has a pump lever extending obliquely upward from the elongated frame 12. The hydraulic circuit is actuated by driving the pump lever to drive the jack arm. The operation of 18 and the operation of the front wheels 14 and the vertical movement roller 20 are configured to interlock with each other. Vertical movement roller 22
Is connected to both ends of a roller shaft 46 extending between the longitudinal plates 24 by a first upper and lower level above the lower end level of the front wheel 14 to a first lower level below the lower end level of the front wheel 14. The front part of the device 10 moves up and down up to two vertical levels with the rear wheel as a fulcrum. With respect to the vehicle body movable jack having the above configuration, the operation will be described below by taking the case where the front portion of the vehicle body A is moved while being jacked up as an example.
First, as shown in FIG. 5, the vehicle body can be moved by the front wheels 14 and the rear wheels 16 with the vertical movement roller 22 previously moved upward and the front wheels 14 set to the first longitudinal position. By moving the jack, as shown in FIG. 6, the vertical moving roller 22 is lifted from the front of the vehicle body A, and the space between the lower surface of the vehicle body A to be moved and the ground contact surface is along the longitudinal direction of the vehicle body. insert. At this time, the insertion depth is adjusted so that the position of the tray 100 of the vehicle body A matches the target jack-up position of the vehicle body A.
As shown in FIG. 5, 0 is stably held substantially horizontally in an unloaded state, and the tray 110 is in a state in which it can be swung along the longitudinal direction of the vehicle body.

Next, the jack arm 18 starts to turn upward, and the vehicle body support portion 150 of the tray 100 at the tip end is brought into contact with the target position below the vehicle body A. At this time, the longitudinal position of the movable jack of the vehicle body, that is, the insertion depth is finely adjusted so that the vehicle body support 150 reaches the target position.
As the jack arm 18 rises, the jack arm 1
The vertical movement roller 22 that interlocks with 8 starts moving downward, and by the time the vehicle body support 150 hits the vehicle body A, the lower end of the roller comes into contact with the ground and the reaction force of the jack arm 18, that is, the weight of the vehicle body A from the front wheels 14. It is supported by the vertically moving roller 22. Then, the vertical movement roller 22 moves further downward to lift the elongated frame 12 upward with the lower end of the rear wheel 16 as a fulcrum, and as a result, the front wheel 1
4 is free from the ground. Jack arm 18
The front wheels 14 that start to move toward the up-and-down moving roller 22 in conjunction with the operation of the above-mentioned operation make the space between the lower surface of the vehicle body A and the elongated frame 12 increased by the operation of the jack arm 18 from the first longitudinal position. It is possible to move to the second longitudinal position. On the other hand, as the jack arm 18 rises, the inclination angle of the vehicle body increases, and the tray 110 rotates about the rotation center axis line 170, so that the vehicle body support 150 follows the inclination angle. At this time, as shown in FIG. 6, the tray 110 is stably held by the arc surface of the tray 110 hitting the smooth surface of the guide member.

Next, as shown in FIG. 7, by the time the tip of the jack arm 18 rises to a predetermined height, the front wheel 14 has the second longitudinal direction in front of the projection position of the jack up point on the elongated arm. Move to position. At the same time, the up-and-down moving roller 22 that is interlocked with the jack-up operation starts to move upward, contrary to the previous process, and the reaction force of the jack-up is supported by the up-and-down moving roller 22 from
Complete transfer to the front wheel 14 in the longitudinal position. On the other hand, the tray is further rotated, and the entire locking surface 250 abuts on the smooth surface 230 of the guide member, thereby preventing the tray 110 from rotating further. With the above, the lifting of the vehicle body A is completed, and the weight of the vehicle body A is determined by the rear wheels 16 of the vehicle body A.
And the vehicle body support 150, guided member 220, guide member 2
It is supported by a pair of front wheels 14 and a pair of rear wheels 16 via 40 and the jack arm 18, and is in a standby state for movement. When the movable body jack is pulled in the direction opposite to the direction in which the jack is inserted through the handle, the jack moves, and at the same time, the vehicle body A supported via the tray 110 moves by the pair of rear wheels of the vehicle body A. .
During the movement, the front wheel 14 easily climbs over the convex surface of the road surface or foreign matters such as pebbles, screws, etc. on the road surface, and adopts the front wheel 14 with a long axle and the swingable saucer assembly 100. Since the stability of A and the jack-up device itself can be ensured, the vehicle body A can be safely moved without a fall accident or the like. After moving to the target movement position, the vehicle body A can be lowered by performing the process reverse to the above, and the movement of the vehicle body A is completed. Incidentally, depending on the situation, even if the vehicle body is not lifted to a position where the locking surface 250 prevents further rotation as shown in FIG. 7, for example, the lifting position shown in FIG. The stability of A and the jack-up device itself can be ensured.

Next, description will be given of a case where a damaged vehicle or an accident vehicle is placed on a luggage carrier such as a truck by using the jack-up device 10 of the present invention. For example, when the front portion of the vehicle body is lifted by using the jack-up device 10 and the rear end of the loading platform is allowed to climb on an inclined surface where the rear end of the loading platform is substantially in contact with the ground, the well-known hoist such as a winch provided in front of the loading platform The machine directly pulls up the rope by hooking the rope hooked on the front hook of the vehicle body. At this time, the car body is
The rear wheel 16 of the jack-up device 10 is moved to the front by the rear wheel of the vehicle body, the rear wheel 16 of the jack-up device 10 and the front wheel 14 having a large diameter. Jack up device 10
Since the rear wheels 16 are normally free to rotate 360 ° for steering, deviation is likely to occur when climbing up an inclined surface. On the other hand, it is difficult for an operator to correct the trajectory of the vehicle body on the inclined surface. It is difficult in terms of space, and it is dangerous if you try to steer. In such a case, if the long handle 60 of FIG. 4 can be bent at the intermediate portion, an operator can correct the trajectory of the vehicle body from the ground. That is, by using a steering handlebar having a bent portion formed by a well-known universal joint, an operator can steer the vehicle body while grasping the tip end portion of the bent handlebar extending in the width direction of the inclined surface while being on the ground. .

Second Embodiment (FIG. 8) In this embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The characteristic parts of this embodiment will be described below. To do. Referring to FIG. 8, the two swingable trays 110 are provided as sliding members 300 having a U-shaped cross section.
It is slidably attached to the elongated attachment 310 in the longitudinal direction via. A pin 320 extending downward is provided at the center of the lower portion of the elongated attachment 310, and the pin 320 is inserted into the parallel plate 330 at the upper end of the jack arm 18. Note that, unlike the first embodiment, the guide member 240 is fixedly provided on the upper surface of the sliding member 300, and has a receiving surface 230 facing upward, and this receiving surface 230 is the center of rotation of the tray 110. And an arc surface extending substantially orthogonal to the rotation axis. This embodiment is particularly useful when the jack-up point cannot be brought to the center of the jack arm as in an accident vehicle, or when the vehicle body is so deformed that the stability of the vehicle body cannot be secured by single-point support with a single tray. It is valid.

[0017]

As is apparent from the above description, according to the first aspect of the present invention, when the vehicle body is supported, the vehicle body support portion of the tray is made to follow the inclination angle of the vehicle body, and The close contact with the tray is maintained, and as a result, the vehicle body can be supported safely and reliably. Further, it becomes possible to absorb the accuracy error of the parallel link mechanism or the pantograph mechanism for raising and lowering the tray, and prevent the instability of the vehicle body promoted by such error. In addition, the saucer stable holding means can prevent the weight of the vehicle body from being applied as a shear load to the saucer supporting means,
As a result, it was possible to prevent the durability of the swingable pan assembly from decreasing. Further, the swingable tray of the present invention can be applied to a conventional jack-up device or car lift by simply replacing the tray. Second of the present invention
According to the invention, it is possible to raise and lower the vehicle body safely and reliably.

[Brief description of drawings]

FIG. 1 is a perspective view of a swingable tray according to a first embodiment of the present invention.

FIG. 2 is a side view of a swingable tray according to the first embodiment of the present invention.

FIG. 3 is an enlarged partial side view of a portion A of FIG.

FIG. 4 is a schematic perspective view of a jack-up device including a swingable tray according to the first embodiment of the present invention.

FIG. 5 is a schematic view showing a usage state of a jack-up device equipped with a swingable tray according to the first embodiment of the present invention.

FIG. 6 is a schematic view showing a usage state of a jack-up device including a swingable tray according to the first embodiment of the present invention.

FIG. 7 is a schematic view showing a usage state of a jack-up device including a swingable tray according to the first embodiment of the present invention.

FIG. 8 is a perspective view of a swingable tray according to a second embodiment of the present invention.

[Explanation of symbols]

 100 Pivotable saucer assembly 110 Saucepan 120 Saucet support means 130 Saucet stable holding means 140 Rotation prevention means 150 Body support section 160 Projection 170 Rotation center axis 180 Through hole 190 Center pin 200 Bolt-nut 210 Contact surface 220 Covered Guide member 230 Receiving surface 240 Guide member 250 Locking surface 10 Jack-up device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunikazu Machida 1-39-24 Hagiyama-cho, Higashimurayama-shi, Tokyo

Claims (12)

[Claims] 1. A vehicle body supporting portion is formed on an upper portion of the vehicle body, and while supporting the weight of the vehicle body from below the vehicle body at a front portion or a rear portion of the vehicle body, the vehicle body supporting portion is moved upward from a first vehicle body supporting position to a second vehicle body supporting position. In the saucer for lifting the front part or the rear part of the vehicle body, the vehicle body support portion is located below the saucer so as to follow the inclination angle in the front-rear direction of the vehicle body that increases as the vehicle body is lifted. A saucer support means for rotatably supporting the saucer about a rotation center axis that is substantially orthogonal to the front-rear direction of the vehicle body; and when the saucer supports the weight of the vehicle body, the saucer is A swingable head characterized by having a pan stable holding means for stably holding the pan at an arbitrary inclination angle formed when it is located between the first vehicle body support position and the second vehicle body support position. Tray assembly. 2. The swingable device according to claim 1, further comprising rotation preventing means for preventing the tray from rotating more than an inclination angle at the second vehicle body supporting position. Saucer assembly. 3. The receiving plate stabilizing means includes a guided member fixed to the receiving plate and having a contact surface facing downward, and a guide member having a receiving surface for receiving the contact surface. Is an arc surface centered on the rotation center of the tray and extending substantially orthogonal to the rotation axis, the receiving surface has a substantially smooth surface, and according to the rotation of the tray, The swingable tray assembly according to claim 1 or 2, wherein the receiving surface guides the tray by the frictional engagement of the arcuate surface continuously on the smooth surface. 4. The receiving tray stabilizing means has a guide member having a receiving surface facing upward for receiving a substantially smooth contact surface formed on a lower surface of the receiving tray, and the receiving surface of the receiving tray of the receiving tray. With the center of rotation as the center,
In addition, the contact surface continuously frictionally engages on the arc surface in accordance with the rotation of the tray in accordance with the rotation of the tray, so that the receiving surface forms the tray. 3. The swingable saucer assembly according to claim 1, wherein the saucer assembly is guided. 5. The rotation preventing means has an engaging flat surface for the receiving surface, which extends from at least one end of the contact surface so as to form a smooth continuous surface with the arc surface. The swingable tray assembly according to claim 3, wherein the locking plane forms a predetermined angle with the receiving surface. 6. The rotation preventing means has a locking flat surface for the contact surface, which extends from at least one end of the receiving surface so as to form a smooth continuous surface with the arc surface. The swingable tray assembly according to claim 4, wherein the locking plane forms a predetermined angle with the contact surface. 7. The swingable tray assembly according to claim 5, wherein the predetermined angle is an inclination angle of the vehicle body at the second vehicle body support position. 8. The saucer support means includes a center pin having a through hole in the direction of the rotation center axis, and a bolt for rotatably connecting the saucer and the center pin through the through hole. The swingable tray assembly according to any one of claims 1 to 7, comprising a nut. 9. A swingable saucer assembly according to any one of claims 1 to 8, and a body for moving the saucer upward from a first vehicle body supporting position to a second vehicle body supporting position. A jack-up device having a tray raising / lowering means for lifting the front part or the rear part of the. 10. A swingable saucer assembly according to any one of claims 1 to 8, and a body for moving the saucer upward from a first vehicle body support position to a second vehicle body support position. A car lift having a tray raising / lowering means for lifting a front portion or a rear portion of the vehicle. 11. The swingable saucer assembly according to claim 9, wherein the saucer raising / lowering means includes the guide member. 12. The swingable saucer assembly according to claim 1, wherein the vehicle body support portion has a non-slip means for preventing slippage with the vehicle body on a peripheral edge thereof.