JPH0356143Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device for automatically closing the back door of a vehicle having a back door during transportation or assembly on an overhead conveyor.

BACKGROUND OF THE INVENTION It is well known that in recent years, automobiles with various designs have been produced in line with the diversification of user needs. One such type of car is the so-called 2-box car, which generally has three doors, one or two pairs of doors on both the left and right sides of the car body, and a back door on the rear side of the car body. Or a 5-door type. When assembling this type of car,
In many cases, all doors are left open during a stage such as the assembly of interior parts, and all doors are closed during other subsequent processes or when assembly is completed. When performing the door closing operation, the doors on both the left and right sides of the vehicle can be easily closed manually, but the back door has its upper end attached to a hinge and rotates within a plane along the vertical direction. The structure is designed to open and close, and in processes where the back door needs to be closed, it is common for the car body to be suspended on a hanger for transport. It is difficult to close by operation. To this end, conventionally, a device for closing the back door has been provided in the middle of the assembly line, an example of which is shown in FIGS. 3 and 4. Reference numeral 1 in these figures is a hanger, which is configured to hang an automobile 2 that is in the process of being assembled and travel along a guide rail 3. An arm 5 for pushing down and closing the back door 4 of the automobile 2 suspended from the hanger 1
is a fulcrum 6 at almost the same height as the guide rail 3.
The arm 5 is attached at its base end so as to rotate around the center, and a rubber roller 7 that acts as a buffer is attached to the distal end of the arm 5. The rod end of an air cylinder 8, which is disposed downward, is rotatably connected to the middle part of the arm 5, and when the open back door 4 operates the limit switch 9 during transportation, the output signal is transmitted. The air cylinder 8 is operated based on this, and as a result, the arm 5 is rotated clockwise in FIG. 3 to close the back door 4.

Problems to be Solved by the Invention In the above-mentioned door closing device, in order to avoid interference with the back door 4 in the event that the back door 4 is left open, the fulcrum 6 of the arm 5 is set in the open state. It is necessary to provide it at a position higher than the highest end of the back door 4, and as a result, the distance between the fulcrum 6 of the arm 5 and the hinge 10 of the back door 4 inevitably becomes large. Therefore, in the conventional apparatus shown in FIGS. 3 and 4, there is a large difference between the movement trajectory of the tip of the arm 5, that is, the rubber roller 7, and the trajectory of the back door 4. At the beginning of the closing operation, the rubber roller 7 moves toward the tip of the back door 4. Although the rubber roller 7 contacts the hinge 10 of the back door 4 at the closed end, that is, just before the closing is completed, the rubber roller 7
It will touch and press the part near the. As a result, in the conventional device described above, the moment acting on the back door 4 ultimately becomes small, so there is a high possibility that the back door 4 will not close completely and will open as the arm 4 rotates back. In order to eliminate this inconvenience, it is conceivable to increase the force with which the arm 5 pushes down the back door 4, but since the rubber roller 7 contacts the glass of the back door 4 and pushes the back door 4, If the push-down force is increased, the local load acting on the glass will increase and there is a risk that the glass will break.

Further, the rubber roller 7 provides a buffer against the glass, but since it is necessary to use a rubber roller 7 having a certain degree of hardness in terms of durability, etc., when the operating speed is increased, The buffering force acting on the glass was increased, and there was a risk that the glass would be damaged.

Furthermore, in the conventional device described above, the back door 4
Since the limit switch 9 is configured to operate on the main body of the vehicle, even if a car 2 with no glass fitted into the back door 4 is transported, the limit switch 9 is operated and the arm 5 is rotated. As a result, there was a risk that the tip of the arm 5 would enter the interior of the vehicle body through the back door 4, causing unnecessary interference.

In view of the above circumstances, the object of this invention is to provide a device that can reliably close the back door and avoid unnecessary interference between the arm and the vehicle body.

Means for Solving the Problems In order to achieve the above object, this invention is characterized in that the arm for pushing down and closing the back door is configured to rotate in two stages. Specifically, in a back door closing device in a vehicle assembly line for a vehicle having a back door that rotates around a horizontal axis and whose tip portion rotates from above to below the horizontal axis, a first arm that has a center of rotation at a position and whose tip descends near the horizontal axis; and a second arm that is rotatably connected to the tip of the first arm and whose tip pushes down the back door of the vehicle to close it. a second arm, a pressing member attached to the tip of the second arm and in contact with the back door, an actuator for rotating each of the arms, and a signal for detecting an open state of the back door of the vehicle and operating the actuator. The device is characterized in that it is equipped with a sensor that outputs an output. Further, in this invention, in order to alleviate the impact force acting on the back door, an elastic member that is bent by the reaction force received from the back door can be interposed between the second arm and the pressing member attached to the tip of the second arm. It is valid. Furthermore, in order to detect the presence or absence of glass in the back door at the same time as detecting the open state of the back door, it is effective to use a sensor configured to be sensitive to glass as the sensor for detecting the open state of the back door.

Operation According to the device of this invention, the back door is closed as follows. That is, when a car with the back door left open is transported, the sensor detects the open back door and operates, and the actuator operates based on the output signal.
In that case, if the sensor is configured to be sensitive to glass, the actuator will not operate if there is no glass in the back door. When the actuator operates based on the sensor output signal,
The first arm and the second arm rotate about their base ends, and as a result, the pressing member provided at the tip of the second arm comes into contact with the back door and pushes it down in a direction to close it. In that case, the first arm rotates around a fulcrum located high relative to the backdoor, but since the second arm is rotatably attached to the tip of the first arm, the rotation of the second arm is The center is near the center of rotation of the back door, that is, near the hinge, and as a result, the tip of the second arm, that is, the movement trajectory of the pressing member, approximates the rotation trajectory of the back door, so the tip of the back door is pressed. The member will push to close the back door. Further, if an elastic member is interposed between the pressing member and the second arm, the elastic member is bent at the same time as the pressing member comes into contact with the back door, so that the impact force acting on the back door is alleviated.

Embodiment Hereinafter, an embodiment of this invention will be described with reference to FIGS. 1 and 2.

The embodiment shown in these figures shows an example in which this invention is applied to an assembly line in which an automobile 2 having a back door 4 is suspended from a guide rail 3 by a hanger 1 and transported. A first arm 12 is rotatably attached at its base end to a predetermined location at approximately the same height as the guide rail 3.
2 has a lever 14 extending in substantially the opposite direction from its rotational fulcrum 13, and the lever 14 is connected to an actuator attached to the main body frame 11, that is, a rod of a first air cylinder 15. Further, at the tip of the first arm 12, a second
An arm 16 is rotatably attached, and an actuator attached to the first arm 12, that is, a rod of a second air cylinder 17 is connected to the intermediate portion of the second arm 16. 2 arm 16 is the second air cylinder 1
7, it is configured to rotate independently with respect to the first arm 12. Furthermore, a rubber roller 18 as a pressing member is attached to the tip of the second arm 16, and its attachment structure is shown in FIG. That is, the rubber roller 18 is rotatably attached to the tip of the lever 19, and
The base end of the lever is rotatably attached to the second arm 16 by a pin 20, and an elastic member 21 such as a leaf spring is inserted between the lever 19 and the second arm 16. ing.

A sensor 22 is provided near the pivot point 13 of the first arm 12 and operates in response to the glass of the back door 4 in an open state to output a signal. Ultrasonic proximity switches can be used.

Next, the operation of the apparatus configured as described above will be explained. Normally, each air cylinder 1
5, 17 retracts its rod, and each arm 1
2 and 16 are retracted to storage position A above the guide rail 3, as shown by solid lines in FIG. When the automobile 2 is transported suspended by the hanger 1, and its back door 4 is open and glass is fitted into the back door 4, the sensor 22 operates in response to the glass. First, the first air cylinder 15 operates based on the output signal, and the first arm 12 rotates together with the second arm 16 to a standby position B shown by a broken line.
In this state, the car 2 is sent further to the back door 4.
When the door contacts the rubber roller 18, the second air cylinder 17 operates and the second arm 16 rotates around the tip of the first arm 12, and as a result, the rubber roller 18 pushes down the back door 4, as shown in FIG. The back door 4 is closed at the lower limit position C shown by the chain line. In that case, since the first arm 12 is rotated so that its tip is located near the hinge 10 of the back door 4, the second arm 16 is rotated around the hinge 10 of the back door 4, that is, a position close to the center of rotation. Since the rubber roller 18 rotates and therefore their trajectories become similar, the rubber roller 18 pushes down the back door 4 while in contact with the tip of the back door 4 to close it. As a result, the torque applied to the back door 4 increases, so that the back door 4 is reliably closed. Moreover, if the rubber roller 18 and the back door 4 come into contact,
Since the elastic member 21 is bent by the force received from the back door 4, the rubber roller 18 is pushed against the back door 4.
Even if the glass comes into contact with the glass, the impact force acting on the glass is reduced, so it is possible to prevent the glass from breaking.

After the back door 4 is completely closed, the second arm 16 is first extended in order to avoid interference between the back door 4 and the connecting portion of the first arm 12 and second arm 16 when the back door is reopened. The first arm is raised, and then the second arm is raised, and each arm 12, 16 returns to its original storage position A.

Effects of the invention As explained above, according to the device of this invention,
Since the rotation center of the second arm is located near the rotation center of the back door, the rotation trajectory of the pressing member that contacts the back door and presses it will approximate the trajectory of the back door. Since the front end of the back door can be pushed until it closes, the torque acting on the back door increases and the back door can be reliably closed. Furthermore, if an elastic member that is bent by the reaction force received from the back door is interposed between the second arm and the pressing member attached to the tip thereof, the impact force acting on the back door can be alleviated, and the Damage can be prevented. Furthermore, if a sensor configured to sense the glass of the back door is used to detect the open state of the back door, if a car is transported without glass in the back door, the actuator will not operate and the arm will not move. Unnecessary interference with the vehicle body can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an embodiment of this invention, Fig. 2 is a partial view showing the mounting structure of the rubber roller,
FIG. 3 is a schematic front view showing a conventional back door closing device, and FIG. 4 is a schematic side view thereof. 2...Automobile, 4...Back door, 12...First arm, 15...First air cylinder, 16...
...Second arm, 17...Second air cylinder, 1
8...Rubber roller, 21...Elastic member, 22...
sensor.

Claims (1)

[Claims for Utility Model Registration] (1) In a back door closing device in a vehicle assembly line for a vehicle having a back door that rotates around a horizontal axis and whose tip portion rotates from above to below the horizontal axis, a first arm having a rotation center at a predetermined position above the conveyance path of the vehicle and whose tip descends near the horizontal axis; A second arm that pushes down and closes the back door of the vehicle, a pressing member that is attached to the tip of the second arm and contacts the back door, an actuator that rotates each of the arms, and a second arm that detects the open state of the back door of the vehicle. A back door closing device for a vehicle assembly line, comprising: a sensor that outputs a signal for operating the actuator. (2) The vehicle according to claim 1 of the utility model registration claim, wherein an elastic member is interposed between the second arm and the pressing member, the elastic member being bent in response to a reaction force from the back door. Back door closing device on assembly line. (3) The back door closing device for a vehicle assembly line according to claim 1, wherein the sensor is constituted by a detector that operates in response to the glass of the back door.