JPH05310081A - Electric-store type auxiliary step for vehicle - Google Patents

Abstract

PURPOSE:To prevent an auxiliary step from sinking caused when a personnel rides on it, and also prevent it from extending by itself even if a self-locking mechanism is not provided in a drive engine or the mechanism comes out of order. CONSTITUTION:A drive engine with torque limiter is used for power source of an auxiliary step 2, and the auxiliary step 2 is brought into overloaded condition in which an upward torque acts on the auxiliary step 2 when it is extended and stopped to increase rigidity. Also, in a swing transmission mechanism for a step plate 8, pivot shafts of a drive arm 11 and a second connecting rod 20 are located at positions beyond dead points on their loci, respectively, and, when the step plate 8 is stored, the pivot shafts of the drive arm 11 and a first connecting rod 14 are located at positions beyond dead points on their loci, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric retractable auxiliary step for a vehicle, which is arranged between the ground surface and the step in a step of a vehicle such as a bus or a truck.

[0002]

2. Description of the Related Art Conventionally, in large vehicles such as buses and trucks, there is a considerable inconvenience when getting on and off because there is a difference in height between the step for getting on and off the vehicle and the ground surface.

Therefore, some came out with an auxiliary step using an air cylinder as a drive source between the ground surface and the step, but due to the characteristics of this air cylinder, unlike the hydraulic cylinder, it is an air pressure type. Therefore, when a load is applied to the auxiliary step, the auxiliary step is displaced and there is no sense of stability, and passengers feel uneasy,
Since it is impossible to control the amount of advance / retreat of the air cylinder, there is a drawback that a sufficient space is required on the side of the vehicle.

The characteristics of the air cylinder will be described in detail. In the hydraulic circuit, leakage measures are completely taken due to the pressure and the material (oil). However, in the air pressure type, complete leakage is prevented in the circuit. No countermeasure was taken, and therefore, some leakage of pressurized air always occurred, and because air has the characteristic of contracting due to pressurization, the auxiliary step is displaced by the load on the auxiliary step. ..

Further, since the air cylinder has a constant top dead center and a bottom dead center, and the amount of advance / retreat of the rod is also constant,
It is not possible to freely set the amount of advance / retreat, the protruding operation of the auxiliary step cannot be stopped midway, and if the mechanism (valve, etc.) that stops the supply of pressurized air fails, The auxiliary step could not be stored and the vehicle could not run.

[0006] Therefore, the applicant of the present application filed Japanese Utility Model Application No. 3-5526.
As shown in FIG. 8 and FIG. 8, rotary shafts b and b1 are attached to the lower surface of the step a of the vehicle, and link arms c and c1 are fixed to the rotary shafts b and b1. A step plate d is pivotally supported, the rotary shafts b and b1 are connected to a drive engine e with a torque limiter, a stopper f is attached to the lower surface of the step a, and the rotary shafts b and b1 are abutting bodies. We have developed an electric retractable auxiliary step for vehicles equipped with g.

In the vehicle electric retractable auxiliary step, the driving force of the drive engine e is transmitted through the drive arm h, the connecting rod i and the driven arm j to the rotary shafts b and b.
1, the link arms c, c1, and the step plate d are rotated, so when the step plate d is extended, the drive engine e
The torque limiter prevents the displacement of the step plate d, but when a person is placed on the step plate d, the step plate d
In order to prevent displacement (sinking) of the drive engine e, it is necessary to increase the rotational torque of the drive engine e. If the rotational torque is increased as a countermeasure against this, the current increases, and the equipment that controls the drive engine e must also increase its capacity. However, it had the drawback of being uneconomical.

Further, the reaction force generated in the toggle mechanism (power booster) formed by the drive arm h and the connecting rod i is in the direction of the drive shaft k of the drive engine e, that is, in the drive shaft k, the reaction force of the drive shaft k. Excessive reaction force is generated in the perpendicular direction,
As a result, the drive engine e needs to have a large rigidity, and the drive engine e must be made to have a large size, which is an uneconomical defect.

Further, the above-mentioned drawbacks are also related to a failure, and when the drive engine e and the step plate d are disconnected by the emergency cock 1, the operation of the emergency cock 1 and the manual storage operation become heavy. ..

When the step plate d is stowed, it is stowed below the step a of the vehicle as shown by the one-dot chain line in FIG. 8, and in order to maintain such a state, it is self-locked by a worm gear or the like in the drive engine e. If the self-locking mechanism is equipped with a mechanism, and if the self-locking mechanism fails, the vehicle will be overhanged if such a mechanism is not equipped, because the step plate d freely projects due to its own weight and vibration during traveling. It had the drawback of not being able to drive.

[0011]

SUMMARY OF THE INVENTION The present invention prevents displacement of the auxiliary step even when a person is placed on the auxiliary step, improves the function of the drive engine and other transmission mechanisms, simplifies the mechanism, and stores the manual operation. To provide an electric retractable auxiliary step for a vehicle that facilitates smooth operation and allows the auxiliary step to travel without trouble even if there is no self-locking mechanism in the drive engine or if there is a failure, without causing the auxiliary step to overhang. To do.

[0012]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned conventional technique, in which an auxiliary step is displaced when a person is getting on and off, an auxiliary step is arbitrarily extended when a failure occurs, and a problem of a storage operation when being manually operated. In view of the above, by using a drive engine with a torque limiter as a drive source of the auxiliary step, it is possible to improve rigidity by setting an overload state in which an upward torque acts on the auxiliary step when the overhang of the auxiliary step is stopped. In the rocking transmission mechanism of the plate, the reaction force generated when a person is placed on the step plate is set by setting the pivots of the drive arm and the second connecting rod beyond the dead point on the track when the step plate is overhanging. The rotation shaft underneath the step receives the reaction force and does not transmit the reaction force to the drive shaft of the drive engine. Of the drive engine and the pivot shaft of the first connecting rod when the step plate is retracted to a position beyond the dead point on the orbit of the drive engine without the self-locking mechanism in the drive engine. Or, even if it breaks down, the step plate is prevented from protruding without permission, and the emergency cock is equipped to shut off the electric motor and drive shaft for manual operation, and the drive arm is stepped by a spring. By making the plate act in the direction of rotation in which it is stored, the manual operation is facilitated and the above problems are not solved.

[0013]

According to the present invention, the step plate swings through the drive shaft and the connecting arm due to the operation of the drive engine, and the reverse stop of the second connecting rod abuts against the tip lever portion of the driven arm, so that the step plate is moved. The overhang of the drive engine is completed, and the rotation of the drive engine is stopped at this time. This rotation stop causes the drive engine (electric motor) to become overloaded (the current increases when the drive engine stops), and then the torque limiter supplies the current. To prevent seizure of the electric motor and generate torque in the electric motor to maintain an overload state.

In this overloaded state, torque acts upward on the step plate, and as a result, the step plate does not sink and displace even if a person rests on the step plate, and the person rests on the step plate. When this happens, weight acts on the step plate in the direction of sinking, but it is held by the reverse rotation stop so that the tip lever part of the driven arm and the pivot of the second connecting rod reach a position beyond the dead point on the track. Moreover, the reaction force with respect to the sinking displacement of the step plate acts on the rotary shaft, and the reaction force is not transmitted to or acts on the drive shaft of the drive engine. It is possible and does not require an increase in the rigidity of the drive shaft of the drive engine or an increase in the torque of the drive engine.

Further, when the step plate is retracted, the pivot axes of the drive arm and the first connecting rod are located beyond the dead point on the track, so the emergency cock is operated to operate the electric motor of the drive engine and the drive shaft. Even if the connection is released, the step plate is prevented from protruding without permission due to its own weight and vibration during traveling.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a step for getting in and out of a large vehicle such as a bus or a truck, and there is a considerable difference in height between the step 1 and the ground surface. An electric retractable auxiliary step 2 is provided on the lower surface of the tip of the step 1.

Reference numeral 3 denotes a mounting board for the auxiliary step 2, the mounting board 3 is mounted on a lower portion of the step 1, and the drive engine 4 for the auxiliary step 2 is fixed to a side portion of the step 1 (inside the vehicle body). Further, the drive engine 4 has an electric motor and a reduction gear (not shown) built therein, and is equipped with a torque limiter (in a control device (not shown)) for controlling the drive force. Equipped with an emergency cock 5 to shut off.

Reference numerals 6 and 6a denote a pair of rotary shafts rotatably mounted on the lower surface of the step 1 in a horizontal and parallel manner.
A pair of link arms 7 and 7a are provided at the front end of the link arm 7, and a step plate 8 is axially supported at the tips of the link arms 7 and 7a so as to project forward.

Reference numeral 9 denotes a connecting arm for swingingly interlocking the drive shaft 10 of the drive engine 4 and the step plate 8. A curved drive arm 11 is attached to the drive shaft 10 and one rotary shaft 6 has a substantially L-shape. Attach the center part of the character-shaped driven arm 12 rotatably,
An adjustable first connecting rod 14 is pivotally supported by pivots 15 and 16 between the base end lever portion 13 of the driven arm 12 and the drive arm 11.

Reference numeral 17 denotes a tip lever portion of the driven arm 12,
A bent portion 18 is provided at the tip of the tip lever portion 17, and a second connecting rod 20 that is adjustable by a pivot 19 is pivotally supported on the bent portion 18, and the tip of the second connecting rod 20 is one The link arm 7a is pivotally supported by the pivot 21 at the tip end thereof.

Auxiliary step 2 (step plate 8)
When the shaft is overhanging, the axis of rotation 19, the axis 19, and the axis 21 are aligned (the dead point A on the orbit of the axis 19) above the axis 19 (the position beyond the dead point A). 2 A bolt-shaped reverse stopper 22 that stops the swing of the step plate 8 by contacting the tip lever portion 17 (bent portion 18) is provided at the base end of the connecting rod 20.
When it is stored below step 1, pivot 15 and drive shaft 1
0, so that the axis 16 is in a straight line (dead point B on the orbit of the axis 15) and the axis 15 is at a position (a position beyond the dead point B) that is phased by a predetermined angle in the rotation direction for storing the step plate 8. And set the drive arm in such a position
A stopper 23 that abuts 11 is provided at a proper position.

Reference numeral 24 is a spring, and the spring 24 shuts off the driving force in the driving engine 4 by the emergency cock 5.
When storing (pushing in) auxiliary step 2 manually,
The drive arm 11 assists the pushing force by forcibly exceeding the dead point B. One end of the spring 24 is hooked on the pivot 15, and a certain point on the orbit of the pivot 15 (a force is required). Is defined as the assisting point C, and the other end of the spring 24 is hooked at the assisting point C at a position where the drive arm 11 acts in the direction of rotation in which the step plate 8 is stored.

Reference numeral 25 denotes a substantially L-shaped support base provided at a proper position of the link arm 7a. The support base 25 is provided with a shaft hole 26, and a shaft 28 of a stopper 27 is inserted into the shaft hole 26 for support. A spring 29 is mounted on a shaft 28 between the base 25 and the stopper 27 to form an absorber 30, and the reverse rotation stopper 22 is a tip lever portion 17 (bent portion 18).
Before contacting with the step 1, the absorber 30 absorbs the shock to the transmission mechanism when the reverse stop 22 contacts the bent portion 18 by contacting the stopper 27 with the frame on the lower surface of step 1.

Further, in the present embodiment, the driven arm 12 is shown as the one in which the base end lever portion 13 and the tip end lever portion 17 are integrally formed, but the present invention is not limited to such a system, and the base end The driven arm 12 may be configured with the lever portion 13 and the tip lever portion 17 as separate bodies, and the base lever portion 13 and the tip lever portion 17 may be rotatably attached to the rotary shaft 6.

Around the rotary shaft 6 in the base lever portion 13 and the tip lever portion 17, substantially arcuate contact pieces 31, 31a forming a circle having a gap S are provided. The contact piece 31 provided on the end lever portion 17 is formed in a semicircular shape or an inferior arc shape (an arc slightly shorter than the semicircular arc).
31a is formed in an inferior arc shape, and when weight acts in the sinking direction of the step plate 8 in the projecting state, the lower ends of the contact pieces 31, 31a abut each other as shown in FIG. Is configured so that the gap S exists.

The base lever portion 13 and the tip lever portion 17
The shape around the shaft hole for rotatably attaching the rotary shaft 6 to the rotary shaft 6 is not limited in any way. In short, the base end lever portion 13 and the front end lever portion 17 rotatably attached to the rotary shaft 6 are The abutting pieces 31, 31a provided on each of them are arranged so as to form a circle having a gap S, and when weight acts in the sinking direction of the step plate 8 in the projecting state, the above state is established and the gap S becomes the step plate 8. It is only necessary to be configured so as to absorb the sinking displacement of the.

A lever is attached to the emergency cock 5 at a position projecting from the drive engine 4, and an electric motor and a drive shaft 10 are provided.
Is shut off.

Reference numeral 32 is a sensor attached to the tip of the step plate 8 and is connected so as to stop the drive engine 4 via a harness (not shown) in response to an operation signal of the sensor 32. An inverted L-shaped substrate on the lower surface of the tip
33 is fixed, and side plates 34 and 34a are provided on the substrate 33 to support the spindle 3
5 and 35a are installed.

Reference numeral 36 denotes a mountain-shaped detection plate attached to the support shafts 35 and 35a. Springs 37 and 37a are attached to the support shafts 35 and 35a, and a front end portion 38 of the detection plate 36 is located in front of the step plate 8. It projects diagonally downward, and the rear end 39 of the detection plate 36 is the detection plate.
It abuts the lower surface of the board 33 when the board 36 swings.

Reference numeral 40 denotes a switch board attached to the lower surface of the front end portion 38 of the detection plate 36.
Switches 41 and 41a are attached to the lower end of 33, which react when the two approach or come into contact with each other.

Since the auxiliary step 2 is mounted under the floor of the vehicle, it is sufficiently waterproof, dustproof and rustproof. Especially, the drive motor storage section and the harness connection section are covered with a full-face cover, etc. Have been carried out.

Next, the operation of the electric retractable auxiliary step for a vehicle according to the present invention will be described. When the drive engine 4 operates, the drive shaft 10 and the drive arm 11 rotate, and the driven arm 12 via the first connecting rod 14. Rotates about the rotary shaft 6, and in response to this, the second connecting rod 20 swings and projects forward, and at the same time, the link arms 7 and 7a also swing, and the step plate 8 moves downward in a horizontal state. It rocks and then rocks forward and upward.

Then, the reverse stop 22 of the second connecting rod 20 abuts on the bent portion 18 of the tip lever portion 17 of the driven arm 12, and the extension of the auxiliary step 2 (step plate 8) is completed. At this time, the drive engine 4 Also stops, and the drive engine 4 (electric motor) becomes overloaded by this rotation stop (current increases when the drive engine 4 stops), and then the supply current is reduced by the torque limiter, Prevents seizure and generates torque in the electric motor to maintain an overloaded state.

In this overloaded state, torque acts upward on the step plate 8. As a result, the step plate 8 does not sink and displace even if a person rests on the step plate 8, and the step plate 8 does not move. The weight of the step plate 8 acts on the step plate 8 when the step plate 8 is mounted on the step plate 8. However, the tip lever part 17 of the driven arm 12 and the second connecting rod 20 in the transmission mechanism are
Is a reversing stop 22, which allows the pivot 19 to rotate, the pivot 6, the pivot 19, the pivot
Hold the shaft 19 above the position where 21 is aligned (the dead point A on the orbit of the shaft 19) (the position beyond the dead point A), and the reaction force against the sinking displacement of the step plate 8 is As shown in FIG. 1, since the pivot shaft 19 exceeds the dead point A, it acts on the rotary shaft 6, and the reaction force is not transmitted or acted on the drive shaft 10 of the drive engine 4. The strength of rigidity can be dealt with only by the rotating shaft 6, and it is not necessary to improve the rigidity of the driving shaft 10 of the driving engine 4 or increase the torque of the driving engine 4.

Next, during operation of the step plate 8, for example, since the step plate 8 swings upward from below, the same operation as above is performed even when the step plate 8 dives under the obstacle and comes into contact with the obstacle. In addition, the step plate 8 is stopped so that the step plate 8 can be stopped halfway, and the ascending force of the step plate 8 is reduced by the torque limiter.

When a pedestrian or the like is present on the swing trajectory of the step plate 8, the sensor 32 at the tip of the step plate 8 contacts the pedestrian and the front end portion 38 of the detection plate 36 swings downward. At the same time, the switch 41 mounted on the switch board 40 swings upward to approach the switch 41a on the board 33, and the drive engine 4 is stopped by this approach signal, thereby ensuring the safety of pedestrians.

When the step plate 8 is projected,
Since the stopper 27 comes into contact with the frame on the lower surface of step 1 before the reverse rotation stopper 22 comes into contact with the tip lever portion 17 (bending portion 18), a shock to the transmission mechanism is caused when the reverse rotation stopper 22 comes into contact with the bending portion 18. Absorber 30 is absorbing.

Further, in the transmission mechanism in which the driven arm 12 is composed of the base end lever portion 13 and the tip end lever portion 17 as separate bodies, the same operation as described above is achieved, and the step plate 8 is operated by the personnel.
The weight of the step plate 8 acts on the step plate 8 when the step plate 8 is placed on the upper side. However, as shown in FIG. 4, the gap S between the contact pieces 31, 31a absorbs the sinking displacement of the step plate 8, and the contact piece 31, 31a
Since the lower ends of the step plates abut each other, the step plate 8 is not depressed and displaced.

On the other hand, when the step plate 8 is stored, the rotations of the drive shaft 10 and the drive arm 11 due to the operation of the drive engine 4 are reverse to those described above, and the driven arm 12 is moved through the first connecting rod 14. It rotates about the rotary shaft 6, and accordingly, the second connecting rod 20 swings and pulls backward, and at the same time, the link arms 7 and 7a swing and the step plate 8 swings upward in a horizontal state. Move and stop 23
Comes into contact with the drive arm 11, and the storage of the step plate 8 is completed.

In this stored state, the drive arm 11
And the first connecting rod 14 is a position in which the pivot shaft 15, the drive shaft 10, and the pivot shaft 16 are aligned (dead point B on the trajectory of the pivot shaft 15) from the position where the pivot shaft 15 is phased with a predetermined angle in the rotational direction in which the step plate 8 is stored. In addition, since the pivot shaft 15 exceeds the dead point B, the self-weight of the step plate 8 and the vibration during traveling act on the rotary shaft 6 and the drive shaft 10 of the drive engine 4 It does not transmit or act, and the strength of rigidity in this respect can be dealt with only by the rotating shaft 6.
Even if the emergency cock 5 is operated to disconnect (disconnect) the electric motor of the drive engine 4 from the drive shaft 10, the step plate 8
The step plate 8 does not overhang due to its own weight and vibration during traveling.

If the drive engine 4 should malfunction, the floor of the vehicle is opened and the emergency cock 5 is operated to disconnect the electric motor of the drive engine 4 from the drive shaft 10, The plate 8 is manually retracted, but when the step plate 8 is pushed halfway (the drive arm 11 reaches the assist point C) during this retracting, the spring 24 causes the drive arm to move.
11 acts on the direction of rotation in which the step plate 8 is stored, and the pivot 15 forcibly crosses the dead point B to enter the storage state.

[0042]

In summary, according to the present invention, the rotary shafts 6 and 6a are attached to the lower surface of the step 1 of the vehicle, the link arms 7 and 7a are pivotally supported on the rotary shafts 6 and 6a, and the link arms 7 and 7a are also supported. Since a step plate 8 is pivotally supported on the rotary shaft 6, and the rotary shafts 6 and 6a are connected to the drive engine 4 with a torque limiter by the connecting arm 9,
When the step plate 8 stops projecting when getting in and out, the step plate 8 stops in an upward overload state and has very high rigidity. Therefore, even when a person is placed on the step plate 8, the step plate 8 sinks and is displaced. Can be prevented.

Further, a driven arm 12 is attached to the rotary shaft 6 in the connecting arm 9, a first connecting rod 14 is pivotally supported between a base end lever portion 13 of the driven arm 12 and the drive arm 11, and a driven arm. A second connecting rod 20 is pivotally supported on the tip lever portion 17 of the second connecting rod 20.
The tip end of 20 is pivotally supported on the tip end of the link arm 7a, and when the step plate 8 is extended, the drive arm 11 and the pivot 19 of the second connecting rod 20 are located beyond the dead point A on the track. Similarly, at the base end of the second connecting rod 20, there is a reverse stop that abuts on the tip of the tip lever portion 17.
Since 22 is attached, the weight that causes the step plate 8 to sink and the reaction force due to the action thereof act on the rotary shaft 6, and the reaction force is not transmitted to or acts on the drive shaft 10 of the drive engine 4. , The drive shaft 10 need not be improved in rigidity, or the torque of the drive engine 4 is increased, the torque limiter, and the electric circuit / capacity are not increased. Only the capacity of the engine 4 is required, and the drive engine 4 and the like can be simplified and the economy can be improved.

Further, since the drive arm 11 and the pivot 15 of the first connecting rod 14 are set to a position beyond the dead point B on the track when the step plate 8 is retracted, the weight of the step plate 8 and Vibrations during traveling act on the rotary shaft 6, and even if the self-locking mechanism in the drive engine 4 fails, the step plate 8 does not overhang without permission, so the traveling state of the vehicle is ensured during traveling. The safety of the drive engine 4 can be improved, and the drive engine 4 does not necessarily need a self-locking mechanism if it is such a transmission mechanism, and the drive engine 4 and the like can be simplified to improve the economical efficiency as described above. Can be done.

In addition, the drive engine 4 is equipped with an emergency cock 5 for shutting off the electric motor and the drive shaft 10, and one end of a spring 24 is hooked on the drive arm 11 and the pivot 15 of the first connecting rod 14 to pivot the pivot. One point on the orbit of 15 is defined as the assisting point C, and the other end of the spring 24 is hooked at a position where the drive arm 11 acts in the direction of rotation for storing the step plate 8 at the assisting point C. Even if the drive engine 4 or the like fails, the emergency cock 5 disconnects the connection between the electric motor and the drive shaft 10, and the step plate 8 is manually retracted to ensure the running condition of the vehicle. While retracted, the step plate 8 is in the middle (drive arm 11
Reach the assist point C) and the spring 24
As a result, the drive arm 11 acts in the direction of rotation in which the step plate 8 is stored, which assists the manual operation and allows the step plate 8 to be stored smoothly.

Further, the driven arm 12 is composed of the base end lever part 13 and the tip end lever part 17 separately, and a gap S is provided around the rotary shaft 6 of the base end lever part 13 and the tip end lever part 17. Since the substantially arc-shaped abutting pieces 29, 29a forming the circle are provided, the same operation as described above is achieved, and when a person rests on the step plate 8, the step plate 8 receives weight in the direction of depression. However, since the gap S between the contact pieces 31, 31a absorbs the sinking displacement of the step plate 8 and the lower ends of the contact pieces 31, 31a contact each other, the step plate 8 does not sink and displace.

Further, before the reverse rotation stop 22 and the tip end lever portion 17 are brought into contact with each other, a stopper 27 which comes into contact with the lower surface of the step 1 of the vehicle is provided at an appropriate position of the link arm 7a through the absorber 30.
When the step plate 8 is overhanging, the absorber 30 absorbs a shock to the transmission mechanism when the reverse stop 22 comes into contact with the tip lever portion 17, and an excessive load is not applied during the overhanging operation of the step plate 8. That is, the practical effect is great.

[Brief description of drawings]

FIG. 1 is a schematic side view of an electric retractable auxiliary step for a vehicle according to the present invention when it is extended.

FIG. 2 is a schematic side view of the vehicle electric retractable auxiliary step of FIG. 1 when stored.

FIG. 3 is a schematic side view showing an operating state of the connecting arm when the vehicle electric retractable auxiliary step is stored.

FIG. 4 is a schematic side view of an electric retractable auxiliary step for a vehicle according to another embodiment when it is extended.

5 is a schematic side view showing a main part of the driven arm shown in FIG.

FIG. 6 is a sectional view of a sensor at the tip of a step plate.

FIG. 7 is a view on arrow D in FIG.

FIG. 8 is a schematic side view of the electric retractable auxiliary step for a vehicle, which is the basis of the present invention, when it is extended.

[Explanation of symbols]

 1 step 4 drive engine 5 emergency cock 6, 6a rotary shaft 7, 7a link arm 8 step plate 9 connecting arm 10 drive shaft 11 drive arm 12 driven arm 13 base lever part 14 first connecting rod 15 pivot shaft 17 tip lever part 19 Axis 20 Second connecting rod 22 Reverse rotation stop 24 Spring 27 Stopper 29, 29a Abutment piece 30 Absorber A Dead point B Dead point C Relief point S Gap

Claims (4)

[Claims] 1. A drive engine having a rotary shaft attached to a lower surface of a step of a vehicle, a link arm being pivotally supported on the rotary shaft, a step plate being pivotally supported on the link arm, and the rotary shaft being equipped with a torque limiter. And a driven arm attached to the rotary shaft of the connected arm, the first connecting rod is pivotally supported between the base end lever portion of the driven arm and the drive arm, and the tip end lever portion of the driven arm. The second connecting rod is pivotally supported, and the tip of the second connecting rod is pivotally supported by the tip of the link arm, and when the step plate is extended, the drive arm and the pivot of the second connecting rod are on their orbits. The reverse stopper that abuts the tip of the tip lever is attached to the base end of the second connecting rod so that the position is beyond the dead point of the step plate, while the step plate is retracted. An electric retractable auxiliary step for a vehicle, characterized in that sometimes the pivots of the drive arm and the first connecting rod are set to a position beyond a dead point on the track. 2. The drive engine is equipped with an electric motor and an emergency cock that shuts off the drive shaft, and one end of a spring is hooked on the drive arm and the pivot of the first connecting rod to fix a certain point on the orbit of the pivot. 2. The electric retractable auxiliary step for a vehicle according to claim 1, wherein the other end of the spring is hooked at a position where the drive arm acts in the direction of rotation for storing the step plate at the assisting point. 3. A substantially arcuate shape in which a driven arm is formed of a separate body of a base end lever portion and a front end lever portion, and a circle having a gap is formed around a rotation shaft of the base end lever portion and the front end lever portion. The electric retractable auxiliary step for a vehicle according to claim 1 or 2, wherein the contact piece is provided. 4. A stopper, which comes into contact with the lower surface of the step of the vehicle, is provided at an appropriate position of the link arm via an absorber before the reverse rotation stop is brought into contact with the tip lever portion. Electric retractable auxiliary step for vehicles.