JPH0430081A - Car loading board elevating device - Google Patents

Abstract

PURPOSE:To reduce the cost and to improve the safety by composing the system to hold a car loading board by nuts screwed to screw rods through spherical seats, while providing the screw rods in a hanging condition through flexible joints. CONSTITUTION:Four screw rods 2 are provided in four struts 1 in a hanging condition by connecting their upper ends to the lower ends of holding shafts through flexible joints 3, and a car loading board 4 is provided on the nuts 5 screwed to the screw rods 2 through spherical joints. And a screw rod rotation driver 6 which consists of a chain 26, a driving sprocket 24, passive sprockets 25, and a motor 26 is provided, and the motor 26 is driven to rotate the screw rods 2 synchronously through sprockets 16, and the car loading board 4 is moved up and down while maintaining the horizontal rate. And even though a force in the direction to generate a bending is inflicted to the screw rods 2, the bending force is prevented form operating to them by the flexible joints 3 and the spherical seats.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle-mounted platform elevating device that is mainly applied to a parking platform that ascends and descends in a two-stage parking device.

[Conventional technology]

Conventional lifting devices for parking devices of this type include those that support the upper parking platform via a chain and drive the chain by a rotary drive unit to raise and lower it, and those that raise and lower the upper parking platform. There are parking platforms that are raised and lowered using hydraulic cylinders.

[Problem to be solved by the invention]

In the case of a conventional parking platform that supports a parking platform through a chain, if the chain were to break, the parking platform would fall, so special safety devices were installed to prevent this.
Teeth are provided on the pillar that serves as a lift guide, and claws provided on the parking platform side engage with the teeth in response to the cutting of the chain to prevent it from falling. Additionally, in the case of a hydraulic type, a special locking device is installed to support the parking platform at the rising end in order to prevent oil leakage. None of these special safety devices are necessary for essential lifting and lowering operations, so they must be installed separately from the lifting device, which increases costs. Ta.

An object of the present invention is to provide a vehicle-mounted platform elevating device that can be manufactured at lower cost and has a safer configuration.

[Means to solve the problem]

This invention comprises at least four threaded rods connected to their upper ends via flexible joints, the support shafts being supported and suspended by bearings provided on a fixed frame, and each of the threaded rods having a screw thread attached thereto. The present invention is characterized by comprising a vehicle mounting base supported by a fitted nut portion through a spherical seat, and a screw rod rotation drive unit provided to rotate each of the support shafts in synchronization.

[For production]

In this invention, the vehicle platform is raised and lowered while maintaining a predetermined level by synchronously rotating each screw rod.

The screw rods are designed and manufactured to be parallel to each other, but strictly speaking, it is difficult for them to be parallel due to manufacturing errors and assembly errors. Due to this error, the screw rod receives a force in a direction that causes bending due to rotation, but since the flexible joint and spherical seat allow this, almost no bending force is applied.
Therefore, since the weight of the vehicle mounting base and the vehicle acts on the screw rod as a simple tensile load, the screw rod will not become very thick even if the safety factor is increased.

〔Example〕

In Figure 0, which describes one embodiment in which the present invention is applied to a two-stage parking device, 1 is a fixed frame, 2 is a screw rod, 3 is a flexible joint, 4 is a vehicle mounting base, and 5 is a nut part. , 6 is a screw rod rotation drive unit.

As shown in FIG. 1, the fixed frame 1 has an upper part 10 formed in a rectangular frame large enough to allow a parked vehicle 7 to pass through in the vertical direction, and is provided to support this upper part. It is composed of four pillars 11 and connecting parts 12 and 13 connecting the lower ends of the pillars 11, and is fixedly provided at a predetermined installation position.

The upper part 10 and the connecting parts 12 and 13 are made of square pipe-like members, and the support column 11 is made of a member having a substantially U-shaped cross section with the open side facing inward.

As shown in FIGS. 1 and 2, the screw rod 2 is attached to each support 1.
1, and its upper end is connected to the lower end of a support shaft 14 via a flexible joint 3, and the support shaft 14 is rotatably supported by a bearing 15 on the upper part 10 of the fixed frame. The flexible joint 3 uses a universal joint. The support shaft 14 has a sprocket 16 fixed to its upper end, has a flange 17 below the sprocket 16, and is supported by the flange 17 via a bearing 15. The bearing 15 is a combination of a thrust bearing and a radial bearing. The screw rod 2 is in a suspended state, and a gap of about 5 m is formed between the lower end and the bottom of the lower end of the support 11.

As shown in FIG. 1, the vehicle mounting base 4 includes horizontal members 18 and 18 that straddle the screw rods 2 on both sides, respectively, and horizontal members 18.
The floor member 20.20 is provided on the upper surface of a frame-like body consisting of vertical members 19.19 which connect 18 back and forth on both sides. As shown in FIGS. 3 and 4, both ends of the horizontal member 18.1B extend inside the column 11 and are supported by the nut portion 5 screwed into the threaded rod 2 via the spherical seat 22, The threaded rod 2 is substantially perpendicular to the horizontal member 18, but the angle is allowed to change. Further, the nut portion 5 is designed not to rotate with respect to the rotation of the screw rod 2, and when the screw rod 2 rotates, the nut portion 5 moves up and down.
Therefore, the vehicle platform 4 moves up and down. In this embodiment, the threaded rod 2 and the nut portion 5 are string screws.

This is a recently commercialized product that replaces the many poles of a conventional pole screw with a nylon string, and the end of the nylon string is fixed in place on the nut side. It is smaller than the pole screw and larger than the pole screw. The lead of the screw of the screw rod 2 and the nut part 5 is caused by the weight acting on the vehicle mounting base 4 side.
It's small enough that it won't turn. As a result, the vehicle mounting base 4 does not naturally descend, and the friction loss in the rotational drive of the screw rod 2 is reduced.

The screw rod rotation drive unit 6 drives the sprocket 16 provided at the upper end of each support shaft 14 at the same rotation speed by a drive sprocket 24 that is engaged with the chain through a series of chains 23. As shown schematically in FIG.
is set up. 25 is a sprocket for tensioning;
In addition, tension sprockets (
Reference numeral 26 in the figure is a motor, which can rotate the drive sprocket 24 in either forward or reverse directions.

The two-tier parking device configured as described above is used by rotating the motor 26 to move the vehicle platform 4 appropriately between the lowered position and the raised position. When the vehicle platform 4 is moved to the lowered position, it becomes flush with the ground surface, and a vehicle can be driven onto the vehicle platform 4. If the vehicle platform 4 is moved to the raised position, the vehicle will be stored in the upper tier, and a lower parking space will be formed below it, allowing another vehicle to park there.

Since the vehicle platform 4 of this two-tier parking device moves up and down while being supported by four screw rods 2 provided in a suspended state, a vibration corresponding to the horizontal clearance between the support column 11 and the vehicle platform 4 occurs. . This shaking is easily tolerated by the deflection of the flexible joint 3 and the displacement of the portion that contacts the spherical seat 22. In other words, a configuration in which no bending force is applied to the screw rod 2 and which allows this shaking without difficulty is the configuration in which the spherical seat 22 in the vehicle mounting base 4 is used.
Even if the manufacturing tolerance is increased for the position of , or the position of the bearing 15 of the support shaft 14, the screw rod 2 can be manufactured in a manner that no bending force is applied to the screw rod 2. Therefore, the device for raising and lowering the vehicle platform 4 of this two-stage parking device can be manufactured without using very precise processing technology.

The configuration in which no bending force is applied to the screw rod 2 provides sufficient strength for the screw, so there is no risk of damage and high safety.
will only stop at that position and will not fall.

In the above embodiments, the threaded rod rotation drive unit is composed of a sprocket, a chain, a motor, etc.; however, it may also be a combination of a gear, a toothed belt, a motor, etc. A configuration in which the motors are driven by individual motors and each motor is operated synchronously is also possible.

Further, in the embodiment, a string screw is used for the threaded portion, but it is also possible to use an ordinary screw.

〔Effect of the invention〕

According to this invention, the four screw rods are provided in a suspended state through flexible joints, and the nut portion screwed onto the screw rods supports the vehicle mounting base via a spherical seat. Since the vehicle platform can be raised and lowered without applying bending force, no unreasonable force is applied to the screw rod, resulting in high safety.

Furthermore, since manufacturing tolerances can be increased, advanced technology is not required for manufacturing, and the device can be manufactured easily, the vehicle-mounted platform elevating device can be provided at low cost, and therefore, the two-stage parking device can be provided at low cost.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of the main parts of an embodiment of the present invention, Fig. 2 is a partially enlarged vertical cross-sectional schematic front view showing the inside of the upper end of the column of the same embodiment, and Fig. 3 is a partially enlarged cross-sectional view of the column. A schematic plan view, FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3. l...Fixed frame, 2...Screw rod, 3...
・Flexible joint (universal joint), 4... Vehicle mounting base, 5... Nut part, 6... Screw rod rotation drive part, 11... Support column, 14... Support Axis, 15...
...Bearing, 18...Horizontal member of vehicle mounting base, 22...
Spherical seat.

Claims (2)

[Claims] (1) A support shaft is connected to the upper end via a flexible joint, and the support shaft is supported and suspended by a bearing provided on a fixed frame. At least four screw rods are screwed into each screw rod. A vehicle-mounted base comprising: a vehicle-mounted base supported by a spherical seat through a spherical seat; and a threaded rod rotation drive unit provided to rotate each of the support shafts in synchronization. lift device. (2) In the vehicle platform elevating device according to claim (1),
The screw rod rotation drive unit includes a driven sprocket provided on each of the support shafts, a driving sprocket rotated by a motor, and a series of chains stretched so that each of the driven sprocket and the driving sprocket interlock with each other. An on-vehicle platform lifting device characterized by comprising: