JPH116324A - Movable footboard parking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust actuation speed and actuation force of a footboard whose constitution is simple and inexpensive and high in impact resistance, by providing a slip clutch mechanism between a driving shaft reciprocated and rotated by a lift cylinder and a footboard shaft or a driven shaft, and allowing and regulating rotation of the driving shaft by a stopper mechanism. SOLUTION: When a piston rod 18 is pulled in with a lift air cylinder 15, a driving shaft 20 rotates through a radial arm 21 counterclockwise. A driven shaft 24 is rotated through a slip clutch 25 in the same direction, a footboard shaft 12 is rotated through a radial arm 28, a connection arm 30 and a radial arm 14 counterclockwise, and the free end parts of the footboard 13 integrated with the footboard shaft 12 is lifted to become an escape prevention position. Even if the footboard 13 is pressed by human power at this state, a driving disc 26 and a driven disc 27 of the slip clutch 25 does not slip, a ratchet wheel 26r is locked with a locking pawl 36a and clockwise rotation of the driving disc 26 is not allowed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking device for swinging a tread plate having a rotating shaft near the ground surface between a vehicle entry position in which a free end is lowered and an escape prevention position in which it is raised.

[0002]

2. Description of the Related Art This type of parking apparatus has already been put to practical use. However, each of the conventional devices has a complicated configuration using an electric motor, and is expensive. In addition, when a large number of units are installed, the power demand becomes extremely high when they are operated at the same time. Therefore, it is necessary to provide large-capacity electric equipment for safety. In addition, there is an unavoidable problem that it does not operate in the event of a power failure. Also, the operating speed and operating force of the tread plate could not be adjusted.

[0003]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned problem of the conventional parking apparatus, and has a simple structure, can be inexpensive, has high shock resistance, and can easily adjust the operation speed and operation force of the tread plate. The aim is to obtain a parking device that can be performed. It is another object of the present invention to provide a safe parking device when a foot or the like is sandwiched between a movable step board and the ground surface.

[0004]

SUMMARY OF THE INVENTION The present invention has a tread plate which is rotatable integrally with a tread shaft disposed near the ground surface. In a movable step type parking device for rotating a part to an escape prevention position in which a portion is raised, a driving shaft reciprocated by a lifting / lowering cylinder device; and a driving shaft, a step plate shaft or a link with the step plate shaft. It is characterized by having a slip clutch mechanism provided between the rotating driven shaft and a stopper mechanism for allowing or restricting the rotation of the driving shaft.

The form of the stopper mechanism is not limited as long as it can permit or regulate the rotation of the driving shaft. For example, a ratchet wheel integrally provided with the driving shaft and a locking claw engaged with and disengaged from the ratchet wheel are used. And a second cylinder device for engaging and disengaging the locking claw with respect to the ratchet wheel. The ratchet wheel and the locking claw are in a direction in which the tread plate rises when both are engaged. It is preferable that the rotation of the driving shaft is allowed and the reverse rotation is prevented. And the second cylinder device of this ratchet mechanism shall apply a force for detaching the locking claw from the ratchet wheel, and separately provide a spring for engaging the locking claw with the ratchet wheel, and always supply compressed air. Preferably, it is not required.

By providing the driven shaft separately from the tread shaft, a degree of freedom can be obtained in the installation position of the driven shaft (drive shaft, slip clutch) and the tread shaft (step plate). In this case, the radial arm protruding from the driven shaft and the radial arm protruding from the tread plate shaft are linked via the connecting arm.
Then, between the radial arm protruding from the driven shaft or the radial arm protruding from the tread plate shaft and the connecting arm, the tread plate is manually raised by a certain angle in a state where the tread plate is lowered to the vehicle approach position. By providing the play that can be performed, even if, for example, a person's foot is caught between the treads when the tread is lowered, it is possible to ensure the safety that only the own weight of the treads is added to the feet.

Although the lifting cylinder device and the second cylinder device can be constituted by a hydraulic cylinder device, it is more preferable to use an air cylinder device in view of facility costs and operation costs.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tread shaft 12 located near the ground surface is rotatably supported on a machine frame 11.
2 is provided integrally with a radial tread 13. The step board 13 is provided at a vehicle entrance position of the parking lot. One end of the tread shaft 12 is provided with a radial arm 14.
Are provided integrally.

The machine frame 11 includes an air cylinder device 1 for lifting and lowering.
One end of a cylinder 16 is pivotally connected to a shaft 17.
The piston rod 18 of the lifting / lowering air cylinder device 15
Is pivotally connected by a shaft 22 to a radial arm 21 of a driving shaft 20 which is parallel to the tread plate shaft 12 and has a different position. The shaft 20 reciprocates forward and backward.

A driven shaft 24 is rotatably supported on the machine frame 11 coaxially with the driving shaft 20. A slip clutch (friction clutch) 2 is provided between the driving shaft 20 and the driven shaft 24.
5 are interposed. The slip clutch 25 has a driving disk 26 integral with the driving shaft 20 and a driven disk 27 integral with the driven shaft 24. A certain amount or more is provided between the driving disk 26 and the driven disk 27. Load (for example, 300 kg-c
m? , What is the unit), a slip mechanism (friction mechanism), not shown, that allows relative rotation of the two when applied. Various types of such slip clutches 25 are known and commercially available, and the present invention does not require any specific mechanism.

A radial arm 28 is provided integrally with the driven shaft 24, and the radial arm 28 and the radial arm 14 of the tread shaft 12 are connected via a connecting arm 30. . That is, the radial arm 28
And the connecting arm 30 are pivotally mounted on a shaft 31, while
The radial arm 14 and the connecting arm 30 are connected to each other by a driving pin 32 protruding from the radial arm 14.
Is fitted in the elongated hole 33 formed in the hole. This drive pin 32
The long hole 33 constitutes a play mechanism which can manually raise the tread plate 13 by a certain angle against its own weight in a state where the tread plate 13 is lowered to the vehicle entry position.

The driving disk 26 of the slip clutch 25 includes
The ratchet wheel 26r is provided integrally. On the other hand, an L-shaped crank 36 is pivotally attached to the machine casing 11 by a shaft 35, and a locking claw 36a that engages with and disengages from the ratchet wheel 26r is formed on one arm of the L-shaped crank 36,
The piston rod 39 of the second air cylinder device 38 is engaged with the other arm 36b. The L-shaped crank 36 is
The locking claw 36a is constantly urged by the compression spring 40 to rotate in a direction of engaging with the ratchet wheel 26r.
When compressed air is sent to the air cylinder device 38 to project the piston rod 39, the locking claw 36a is
Moves away from the ratchet wheel 26r. L-shaped crank 3
6 and the ratchet wheel 26r in a state where both are engaged with each other.
Is allowed to rotate counterclockwise, but not in the opposite direction.

The above-structured apparatus operates as follows.
Now, when compressed air is sent to the lifting / lowering air cylinder device 15 to retract the piston rod 18, the radial arm 21
And the driving shaft 20 rotates counterclockwise in FIGS. Then, the driven shaft 24 rotates integrally in the same direction via the slip clutch 25, and the rotation of the driven shaft 24 is controlled by the tread shaft 12 via the radial arm 28, the connecting arm 30, and the radial arm 14. , And the tread shaft 12 rotates similarly in the counterclockwise direction. Then, the free end of the step board 13 integral with the step board shaft 12 rises to the escape prevention position. The solid lines in FIGS. 1 and 2 indicate this escape prevention position. When the piston rod 18 is retracted, L
The locking claw 36a of the mold crank 36 is engaged with the ratchet wheel 26r by the force of the compression spring 40. However, when the ratchet wheel 26r rotates counterclockwise, each tooth of the ratchet wheel 26r is locked. 36a, the above operation is not hindered.

On the other hand, when the stepping plate 13 is in the escape preventing position, even if the force is applied to the stepping plate 13 by a force of about human power to push it down, the driving disk 26 and the driven disk 27 of the slip clutch 25 do not slip (relative rotation). And the ratchet wheel 26r is engaged with the locking claw 36a and the driving disc 2
6 does not allow clockwise rotation. That is, the tread plate 13 cannot be pushed down, and thus the vehicle cannot escape without paying a fee, for example. Further, since the rotation of the tread plate 13 in the descending direction is mechanically prevented by the ratchet wheel 26r and the locking claw 36a, if it is detected that the tread plate 13 has risen to the escape prevention position, the lifting / lowering air cylinder device 15 The supply of compressed air to the pump can be stopped.

On the other hand, the step plate 1 in the escape prevention position
In the case where a large load such as the weight of a vehicle is applied to the vehicle by some illegal means, the driving disk 26 and the driven disk 27 of the slip clutch 25 slide to allow the tread plate 13 to descend. The power transmission system leading to the cylinder device 15 or the ratchet mechanism (stopper mechanism) of the ratchet wheel 26r and the locking claw 36a is prevented from being damaged.

To lower the tread plate 13 to the vehicle advance / retreat position, first, compressed air is sent to the air cylinder device 38 to rotate the L-shaped crank 36 in the counterclockwise direction in FIGS. Release from ratchet wheel 26r. Next, the piston rod 18 of the lifting / lowering air cylinder device 15 is pushed out, the driving shaft 20 is rotated clockwise, the driven shaft 24 is rotated clockwise via the slip clutch 25, and the radial arm 28 is further rotated. The tread shaft 12 is rotated clockwise via the connecting arm 30 and the radial arm 14. Then, the tread plate 13 reaches the descending position (vehicle advance / retreat position). Therefore, the vehicle can move forward and backward.

In the lowered position of the stepping plate 13, the stepping plate 13 can be moved up and down by an angle corresponding to the play between the drive pin 32 and the slot 33. That is, in the initial stage of the pushing operation of the piston rod 18, the elongated hole 33 of the connecting arm 30 is set.
Moves relative to the drive pin 32, and after the drive pin 32 contacts the left end of the elongated hole 33 in FIGS. 1 and 2, starts rotating the radial arm 14 together. Therefore, when the tread plate 13 reaches the vicinity of the lowered position, the drive pin 32 is
Until it comes into contact with the right end of the figure, the step board 13 can be moved against its own weight. This means that, for example, even when the foot is sandwiched between the tread plate 13 and the ground surface, only the own weight of the tread plate 13 is applied to the foot, and the thrust of the lifting / lowering air cylinder device 15 is not applied, It is safe. When the footboard 13 is in the escape prevention position,
Based on the play between the drive pin 32 and the elongated hole 33, the tread plate 13 can be rotated in the direction of further raising by hand, but this has nothing to do with the function.

In the above embodiment, the tread shaft 12 and the driven shaft 2
4 is a separate shaft, and both shafts are connected by the connecting arm 30.
There is an advantage that the degree of freedom of the position of the tread shaft 12 and the driven shaft 24 can be easily obtained. However, for example, in the case where the shaft position of the driving shaft 20 can be set near the ground surface, the present invention is established even if the tread plate 13 is provided directly on the driven shaft 24. In the above embodiment, the spring for biasing the L-shaped crank 36 is provided separately from the air cylinder device 38. However, the spring may be provided in the air cylinder device 38.

Since the lifting and lowering air cylinder device 15 and the air cylinder device 38 are operated by compressed air, there is no need to worry about power demand even when a large number are operated simultaneously.
Even in the event of a power failure, until the compressed air in the tank is consumed,
It has the advantage of being operable. The lifting / lowering air cylinder device 15 and the air cylinder device 38 can be replaced with a hydraulic cylinder device. However, the air cylinder device has the advantage that the equipment for the operation source (compressor, accumulator (tank), etc.) is less expensive than the hydraulic cylinder device and does not pollute the surroundings.

[0020]

As described above, according to the present invention, the structure is simple and inexpensive, the impact resistance of the cylinder device can be obtained, and the operating speed and operating force of the tread plate can be adjusted by setting the cylinder device. Can be easily performed. Further, a safe parking device can be obtained when a foot or the like is sandwiched between the movable tread plate and the ground surface.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a movable tread-type parking device according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Machine frame 12 Tread shaft 13 Tread plate 14 Radial arm 15 Elevating air cylinder device 20 Driving shaft 21 Radial arm 24 Follower shaft 25 Sliding clutch 26 Driving disk 26r Ratchet wheel (stopper mechanism) 27 Follower disk 28 Radial arm 30 Connection Arm 32 Drive pin 33 Slot 36a Locking claw (stopper mechanism) 38 Air cylinder device (second) 40 Compression spring

Claims (6)

[Claims] 1. A stepping plate which is rotatable integrally with a stepping plate shaft disposed near the ground surface, wherein the stepping plate is moved up to a vehicle entry position where its free end is lowered and its free end is raised. A movable tread plate-type parking device that is pivotally moved to the escape prevention position, wherein a driving shaft that is reciprocated by an elevating cylinder device;
A slip clutch mechanism provided between the drive shaft and the tread shaft or a driven shaft that rotates in conjunction with the tread shaft; and a stopper mechanism that permits or regulates rotation of the drive shaft. Features a movable tread plate type parking device. 2. The parking device according to claim 1, wherein the stopper mechanism includes a ratchet wheel integrally provided on the driving shaft, a locking claw engaged with and disengaged from the ratchet wheel, and the locking claw formed on the ratchet wheel. A ratchet mechanism including a second cylinder device that is engaged and disengaged with respect to the ratchet wheel.
A movable tread-type parking device that permits rotation of the driving shaft in the direction in which the tread rises, and prevents reverse rotation. 3. The parking device according to claim 2, wherein the second cylinder device of the ratchet mechanism applies a force for releasing the locking claw from the ratchet wheel, and engages the locking claw with the ratchet wheel. Is a movable tread plate type parking device that is provided separately. 4. The parking device according to claim 1, wherein the driven shaft is provided separately from the tread shaft, and a radial arm and a tread shaft protruding from the driven shaft. A movable tread-plate type parking device in which a radial arm protruding from the arm is linked via a connecting arm. 5. The parking device according to claim 4, wherein a step plate is provided between the radial arm protruding from the driven shaft or the radial arm protruding from the tread plate shaft and the connecting arm. A movable footplate type parking device provided with a play that allows the footplate to be manually raised by a certain angle in a state where the footplate is lowered. 6. The movable tread plate type parking device according to claim 1, wherein the lifting cylinder device and the second cylinder device are air cylinder devices.