JPH11166359A - Feeding structure for sliding door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feeding structure for a sliding door capable of supplying power to an electric device disposed in the sliding door without impeding the opening and closing operation for the sliding door, even if a sliding door is in an opened state, considering assembling efficiency. SOLUTION: A tension device 17 is connected to a slide door 2 to be moved in the opening or closing direction of the door 2. A fixed drum of a take-up part 18 is electrically connected to a battery. A flexible flat cable 19 has connectors at both ends. one connector is inserted and fixed to the fixed drum, and the other connector 19b is inserted and fixed to the tension device 17. The take-up part 18 is rotated simultaneously with the opening or closing movement of the door 2 to take up and unwind the cable 19. A wiring 19d electrically connects the connector 19b inserted and fixed to the tension device 17 to an electric device disposed in the door 2 to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply structure for a sliding door which supplies electric power to electric equipment disposed on a sliding door which opens and closes an opening by sliding, and particularly relates to a door opening / closing opening of a vehicle. The present invention relates to a slide door power supply structure suitable for a vehicle slide door.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Hei 7-267020 discloses a power supply structure for supplying electric power from a power supply disposed outside a door to an electric device disposed on the slide door. In this power supply structure, a female connector for power supply is provided on the vehicle body, and a male connector is provided on a portion facing the female connector when the slide door is closed. Then, when the slide door is closed, the two connectors come into contact with each other to supply power from an electric power source disposed in the vehicle body to an electric device disposed in the slide door. .

[0003]

By the way, the present applicant detects the operating force exerted on the pressure sensor provided on the grip of the slide door when the occupant opens and closes the slide door.
A door opening / closing device that opens and closes a sliding door by actuating an actuator in accordance with the detected value was prototyped.

[0004] However, when the slide door is closed, power can be supplied to the pressure sensor by means similar to the power supply structure described in the above publication, but when the slide door is open, both connectors are connected. Since it is in a non-contact state, power cannot be supplied to the pressure sensor. Therefore, in the power supply structure described in the above publication, the actuator cannot be controlled while the slide door is open.

The problem that power cannot be supplied when the slide door is open is a problem, for example, when a power window device is provided on the slide door, the power window device cannot be supplied when the slide door is open. This is not a problem inherent to the door opening / closing device, such as being unable to operate, but is a common problem that occurs when an electric device is disposed on a sliding door.

[0006] In order to solve this problem, it is conceivable to simply connect an electric device provided on the sliding door and a power supply provided on the vehicle body with a power supply cable.
When opening and closing the slide door, the power supply cable may be forcibly pulled or excessively bent, which may hinder the opening and closing operation of the slide door.

[0007] Furthermore, even when the slide door is open as described above, not only a device for supplying power to electric equipment disposed on the slide door is created, but also the device is assembled in a product. Sex needs to be considered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to supply power to an electric device provided in a slide door even when the slide door is open. It is another object of the present invention to provide a power supply structure for a slide door that does not hinder the opening / closing operation of the slide door and that is easy to assemble.

[0009]

According to a first aspect of the present invention, there is provided a power supply disposed outside a sliding door which slides to open and close an opening. A power supply structure for a sliding door that supplies power from the sliding door, the moving body moving in the opening and closing direction of the door connected to a door stay extending from the sliding door, and a power supply side connection electrically connected to the power supply. And a connector at both ends thereof, and one connector is inserted and fixed to the power supply side connection portion, and the other connector is inserted and fixed to any one of the moving body, the door stay and the slide door. A power supply line to be connected, a winding means for rotating in synchronization with the opening and closing movement of the slide door to take up and rewind the power supply line, and electrically connect the other connector to the electric device. And gist that a connecting means.

According to a second aspect of the present invention, in the power supply structure for a slide door according to the first aspect, the moving body moves in the opening and closing direction of the slide door based on rotation of an electric motor to move the slide door. The invention is characterized in that the winding means rotates based on the rotation of the motor and winds and unwinds the power supply line.

[0011] The invention described in claim 3 is the invention according to claim 1 or 2.
In the power supply structure for a slide door according to the item (1), the power supply line is configured by a flexible flat cable.

According to a fourth aspect of the present invention, in the power supply structure for a slide door according to any one of the first to third aspects, the slide door is a vehicle slide door slidably supported on a vehicle body. The gist is that there is.

Therefore, according to the first aspect of the present invention,
The power supply line is connected and fixed to a power supply side connection portion where one connector is electrically connected to a power supply, and the other connector is a sliding door, a door stay extending from the door, and a moving body connected to the door stay. One of them is inserted and fixed. The connecting means electrically connects the other connector to an electric device provided on the sliding door. The winding means rotates in synchronization with the opening and closing movement of the slide door to wind and rewind the power supply line. Therefore, power can always be supplied from the power supply to the electric device by the power supply line and the connection means regardless of the open / closed state of the slide door. In addition, since the electrical connection of the power supply line is performed by the connector, it does not lower the assemblability. Further, since the power supply line is wound up and rewinded in synchronization with the opening and closing movement of the slide door by the winding means, the power supply line is forcibly pulled or excessively bent with the opening and closing operation of the door. There is no trouble, and there is no hindrance to the opening and closing operation of the slide door.

According to the second aspect of the present invention, the moving body moves in the opening and closing direction of the sliding door based on the rotation of the electric motor to open and close the sliding door. The winding means rotates based on the rotation of the motor to wind and rewind the power supply line. Therefore, even if the slide door is automatically opened and closed by the electric motor, the same effect as that of the first aspect can be obtained.

According to the third aspect of the present invention, the power supply line is constituted by a flexible flat cable. Accordingly, the cable can be easily wound by the winding means.

According to a fourth aspect of the present invention, the slide door is a vehicle slide door slidably supported on a vehicle body. Therefore, regardless of the open / closed state of the slide door, power can always be supplied from the power supply provided outside the vehicle slide door (vehicle body) to the electric device provided in the door via the power supply line.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a vehicle 1 having a sliding door. The sliding door 2 is slidably supported in the front-rear direction with respect to the vehicle body 1a, and opens and closes a doorway 1b as an opening of the vehicle by sliding.

The sliding door 2 has a grip portion 3a provided inside and outside the vehicle for performing a manual operation, and an operating force exerted on the grip portion 3a when the occupant opens and closes the slide door 2 is detected. A handle switch 3 for outputting the operation force detection signal is provided.

The slide door 2 is provided with a pressure-sensitive switch 4 for detecting an external force of a predetermined value or more acting on one side 2a in front of the slide door 2. The pressure-sensitive switch 4 is a well-known pressure-sensitive switch in which an electrode having a predetermined gap is disposed in an elastically deformable rubber tube.
When an external force acts on the tube, the electrodes come into contact with each other and output an external force detection signal. When the external force is detected by the pressure-sensitive switch 4, the pinch between the slide door 2 and the vehicle body 1a is detected.

Inside the sliding door 2, a door lock device 5 for electrically locking and unlocking the door 2 and a door lock device 5
And an in-door controller 6 for performing the above control. Each detection signal of the handle switch 3 and the pressure-sensitive switch 4 is inputted to the door controller 6.

A slide drive device 7 for driving the slide door 2 to slide is provided below the entrance 1b of the vehicle. As shown in FIG. 2, the slide drive device 7 is formed so that its base plate 8 extends in the front-rear direction of the entrance 1b, and is assembled to the vehicle body 1a.
A pulley 9 is rotatably attached to a front end of the base plate 8. In addition, a rotation drive device 10 is attached to a rear end portion of the base plate 8.

As shown in FIG. 3, the rotary drive device 10 has an electric motor 11, a reduction mechanism 12 having a worm and a worm wheel for reducing the rotation of the motor 11, and can intermittently rotate the rotation reduced by the reduction mechanism 12. And an electromagnetic clutch 14 for transmitting the rotation to the rotating shaft 13. The electromagnetic clutch 14 is in an excited state at the time of automatic opening and closing, so that the rotating shaft 13 and the reduction mechanism 12 are connected to each other.
2 is disconnected.

A sprocket 15 is fixed to the rotating shaft 13. This sprocket 15 is formed in a substantially columnar shape, and locking projections 15a are formed on the outer peripheral surface thereof at equal angular intervals as shown in FIG.

An annular drive tape 16 is mounted between the sprocket 15 and the pulley 9. The drive tape 16 is formed with locking holes 16a for engaging with the locking projections 15a of the sprocket 15 at regular intervals.

More specifically, the drive tape 16 is formed in a ring shape by connecting both ends of a tape made of a synthetic resin material in the form of a belt with a tension (tension) device 17 as a moving body. The tension device 17 applies a predetermined tension to the drive tape 16 so that the drive tape 16 smoothly rotates between the sprocket 15 and the pulley 9.

A lower roller 17a is integrally connected and fixed to the tension device 17. In the longitudinal direction of the base plate 8, a guide rail 8a for guiding the movement of the lower roller 17a is formed. A door stay 2b provided below the slide door 2 is connected to the lower roller 17a.

When the electric motor 11 rotates to open the slide door 2 when the electromagnetic clutch 14 is in the excited state and the rotating shaft 13 and the speed reduction mechanism 12 are in the connected state, The sprocket 15 rotates clockwise, and the drive tape 1 rotates with the rotation.
6 rotates in the same direction. Then, the lower roller 17a moves rearward along the guide rail 8a with the rotation of the drive tape 16, and the sliding door 2 is opened.

Conversely, when the electric motor 11 rotates to close the slide door 2, the sprocket 15 rotates clockwise in FIG. 2, and the drive tape 16 rotates in the same direction with the rotation. Then, the drive tape 16
With the rotation of, the lower roller 17a moves forward along the guide rail 8a to close the slide door 2.

When the electromagnetic clutch 14 is in a non-excited state and the rotating shaft 13 and the speed reduction mechanism 12 are in a non-coupled state, when the slide door 2 is manually opened, the lower roller 17a is driven by the guide rail. 8a, the drive tape 16 and the sprocket 15
Rotates counterclockwise at.

Conversely, when the slide door 2 is manually closed, the lower roller 17a moves forward along the guide rail 8a, and the drive tape 16 and the sprocket 15 are moved.
Rotate clockwise in FIG.

The sprocket 15 has the structure shown in FIGS.
As shown in the figure, a winding portion 18 is provided as winding means having the same diameter as the sprocket 15. The winding section 18 winds a flexible flat cable (hereinafter, referred to as a flat cable) 19 as a power supply line as the sprocket 15 rotates. The flat cable 19 is provided with a power supply line and a signal line.

More specifically, as shown in FIG. 5, the winding section 18 has a cylindrical winding drum 18a which rotates with the rotation of the sprocket 15, and a vehicle body 1a disposed inside the winding drum 18a. And a cylindrical fixed drum 18b as a power supply side connection portion fixed to the power supply side.

A connector 19a provided at one end of the flat cable 19 is inserted and fixed to a fixed drum 18b. One end of the flat cable 19 is connected via a connector 19a to a battery (12 volt) 20 as a power source provided in the vehicle shown in FIG.
Is connected to a slide door controller 21 that controls

In a space 18c between the fixed drum 18b and the winding drum 18a, there is provided a winding adjusting cable portion 19c in which the flat cable 19 is spirally wound around the fixed drum 18b. The take-up drum 18a is fixed to the take-up fixing portion 18d. Flat cable 19
Is led to the outer periphery of the winding drum 18a from the winding fixing portion 18d. A connector 19 b provided at the other end of the flat cable 19 is inserted and fixed to the tension device 17. Then, from the connector 19b inserted into the tension device 17, the tension device 17 and the door stay 2 are connected.
A wire 19d as connecting means extends in the slide door 2 along the line b, and the wire 19d is connected to the controller 6 in the door. That is, the other end of the flat cable 19 is connected to the in-door controller 6 via the connector 19b and the wiring 19d.

In this manner, the door controller 6 on the slide door 2 side, the battery 20 as a power source on the vehicle body 1a side and the slide door controller 21
Are electrically connected to each other so that power can be supplied and signals can be exchanged. Note that power is supplied to various electric devices provided in the sliding door 2, that is, in the present embodiment, the door lock device 5 and the pressure-sensitive switch through a controller 6 in the door.

When the slide door 2 is in the fully closed state, the flat cable 19 extends as shown in FIG.
a, the winding adjustment cable portion 19c inside the fixed drum 18
b.

When the sliding door 2 is opened,
As described above, the sprocket 15 rotates in the counterclockwise direction in FIG. 5, and the winding drum 18a integrally formed with the same diameter as the sprocket 15 also rotates in the same direction.
Then, the flat cable 19 is wound around the winding drum 18a as shown in FIG. At this time, since the sprocket 15 and the winding drum 18a have the same diameter, the lower roller 17a and the connector 19b of the flat cable 19 inserted and fixed to the tension device 17 connected to the lower roller 17a are: The moving speed associated with the opening operation of the slide door 2 becomes substantially the same.

On the other hand, inside the take-up drum 18a, the take-up adjustment cable unit 1 tightly wound around the fixed drum 18b is rotated with the counterclockwise rotation of the take-up drum 18a.
9c gradually loosens. Eventually, when the slide door 2 is fully opened, the winding adjustment cable portion 19c is completely loosened with respect to the fixed drum 18b as shown in FIG.

On the other hand, when the slide door 2 is closed,
As described above, the sprocket 15 rotates clockwise in FIG. 7, and the winding drum 18a also rotates in the same direction. Then, the flat cable 19 is rewound around the winding drum 18a as shown in FIG. At this time, since the sprocket 15 and the winding drum 18a have the same diameter, the lower roller 17a and the lower roller 1a have the same diameter.
The moving speed associated with the closing operation of the slide door 2 is substantially the same as that of the connector 19b of the flat cable 19 which is inserted and fixed to the tension device 17 connected to 7a.

On the other hand, inside the winding drum 18a, as the winding drum 18a rotates in the clockwise direction, the winding adjusting cable portion 19c loosened with respect to the fixed drum 18b gradually becomes denser. Eventually, when the slide door 2 is fully closed, the winding adjustment cable portion 19c is completely and tightly wound around the fixed drum 18b as shown in FIG.

That is, the winding section 18 winds and unwinds the flat cable 19 at the same speed as the opening / closing operation speed of the slide door 2 in the opening / closing operation.
The structure is such that the cable 19 is prevented from being excessively bent.

The rotation shaft 13 is provided with a rotation sensor 22 for detecting the number of rotations of the rotation shaft 13 as shown in FIG. The rotation sensor 22 outputs a pulse signal synchronized with the rotation of the rotating shaft 13 to the slide door controller 21.

In addition to the steering wheel switch 3, a switch for operating the rotary drive device 10 is provided as a driver side opening / closing switch 23 near the driver's seat as shown in FIG. It is provided as a doorway opening / closing switch 24. Both switches 23 and 24 output an open / close command signal to the slide door controller 21 respectively.

Next, control of the slide door controller 21 will be described with reference to FIG. The slide door controller 21 detects the position of the slide door 2 by counting the pulse signals of the rotation sensor 22. That is,
Since the rotation shaft 13 rotates with the opening and closing of the slide door 2 regardless of whether it is “automatic” or “manual”, the slide door controller 21 is synchronized with the rotation of the rotation shaft 13 from the rotation sensor 22. Counting is performed based on the pulse signal, and the position of the sliding door 2 is always detected.

When a lock command signal is inputted from a door lock switch (not shown) to lock the slide door 2, the slide door controller 21 transmits the door lock device via the door controller 6 connected to each other by the flat cable 19. 5 is locked.

When the slide door 2 is automatically closed by the rotary drive device 10, the slide door controller 21 applies an external force of not less than a predetermined value to the pressure-sensitive switch 4, and outputs an external force detection signal based on the external force. When input via the in-door controller 6, it is determined that something has been caught between the door 2 and the vehicle body 1a. Then, the slide door controller 21 reversely drives the electric motor 11 of the rotary drive device 10 for a predetermined time to open the slide door 2 by a predetermined amount.

The slide door controller 21 is slid by the rotary drive unit 10 when an operation force detection signal, which has detected the operation force of the handle switch 3 provided on the grip portion 3a, is input via the in-door controller 6. The door 2 is opened and closed. That is, when the occupant opens the fully closed slide door 2 with the grip portion 3a, the slide door controller 21 rotates the slide door controller 21 based on the operation force detection signal from the handle switch 3 based on the operation force detection signal. 2 is opened. On the other hand, when the occupant closes the sliding door 2 that is being fully opened by the grip portion 3a, the sliding door controller 21 rotates the sliding door 2 based on the operation force detection signal from the handle switch 3 based on the operation force detection signal. Is closed.

The slide door controller 21 also controls the rotary drive 10 based on the open / close command signals from the driver's seat side open / close switch 23 and the entrance / exit side open / close switch 24.
The sliding door 2 is opened and closed via the.

The slide driving device 7 configured as described above
Regardless of the open / close state of the slide door 2, the vehicle body-side electric devices (the slide door controller 21, the rotation drive device 10, the battery 20, etc.) and the slide door-side electric devices (the door controller 6, the handle switch 3, The pressure switch 4 and the like are always electrically connected by the flat cable 19.

The flat cable 19 is wound or unwound by a winding section 18 provided in the rotary drive device 10 in synchronization with the opening and closing movement of the slide door 2. Therefore, the flat cable 19 is not forcibly pulled and is prevented from being excessively bent.

Further, the flat cable 19 is provided with connectors 19a and 19b at both ends,
When assembling, one connector 19a is inserted and fixed to the fixed drum 18b of the winding section 18, and is electrically connected to the vehicle body side electric equipment (slide door controller 21, rotary drive device 10, battery 20, etc.). You. The other connector 19 is inserted and fixed to the tensioning device 17, and the sliding door side electric device (the door controller 6,
Handle switch 3, pressure-sensitive switch 4, etc.). Therefore, the electrical connection of the flat cable 19 can be performed by each of the connectors 19a and 19b, so that the mounting operation is easy.

As described above, this embodiment has the following features. (1) The flat cable 19 includes a battery 20 mounted on the vehicle body 1a and electric devices on the sliding door side (the door controller 6, the handle switch 3, the pressure-sensitive switch 4).
Are electrically connected to each other, and wound up or rewound in synchronization with opening and closing movement of the slide door 2 by a winding unit 18 provided in the rotary drive device 10. Therefore, power can always be supplied from the battery 20 to the sliding door-side electric device by the flat cable 19 irrespective of the open / close state of the sliding door 2. And flat cable 1
9 is taken up or rewound in synchronization with the opening and closing movement of the slide door 2 by the winding unit 18, so that the flat cable 19 is forcibly pulled or excessively bent when the door 2 is opened and closed. There is no hindrance to the opening and closing operation of the slide door 2.

(2) In this embodiment, the flat cable 19 can be attached by the connectors 19a and 19b.
Therefore, the mounting work can be facilitated, and it can contribute to the improvement of the assembling property.

(3) In this embodiment, since the flexible flat cable 19 is used, the winding of the cable in the winding section 18 can be performed more easily than other cables.

(4) The handle switch 3 is disposed on grip portions 3a provided inside and outside the slide door 2 respectively. Then, the sliding door 2 is
By operating the handle switch 3 provided in a,
The automatic opening / closing operation is performed by the slide driving device 7. Therefore,
It is possible to reduce an uncomfortable feeling of the operator concerning the automatic opening / closing operation of the slide door 2.

(5) A pressure-sensitive switch 4 is attached to one side 2a in front of the sliding door 2. When an external force of a predetermined value or more acts on the door 2, the pressure-sensitive switch 4 applies the external force. The detected external force detection signal is output to the slide door controller 21. And the sliding door controller 2
When the pressure-sensitive switch 4 detects an external force equal to or more than a predetermined value, the slide driving device 7 stops the further closing operation of the sliding door 2 and opens the door 2 by a predetermined amount. Let it. Therefore, the sliding door 2 and the vehicle body 1
a can be prevented beforehand.

(6) Moreover, since the pressure-sensitive switch 4 is provided on the slide door 2 side, it can easily respond to an external force, and the pinch between the slide door 2 and the vehicle body 1a is ensured. Can be prevented beforehand.

(7) The drive tape 16 has locking holes 16a formed at equal intervals to transmit the rotational force of the sprocket 15. Therefore, the drive tape 16 can be formed more easily than a toothed shape, and can be formed at low cost.

Note that the present invention is not limited to the above-described embodiment, and may be as follows without departing from the gist of the present invention. In the above-described embodiment, the door lock device 5, the pressure-sensitive switch 4, the handle switch 3, and the in-door controller 6 are mounted as electric devices in the slide door 2, but other electric devices such as a door closer device, a power window device, etc. A device may be mounted.

In the above embodiment, the winding portion 18 is provided on the vehicle body 1a side (the rotary drive device 10), but the winding and rewinding of the flat cable 19 is synchronized with the opening and closing movement of the slide door 2. If possible, take-up unit 1
8 may be provided on the slide door 2 side.

In the above embodiment, the connector 19b provided at the other end of the flat cable 19 is inserted and fixed to the tension device 17, but the slide door 2 or the door stay 2b is similarly provided with an insertion portion to The connector 19b of the cable 19 may be inserted and fixed.

In the above embodiment, the slide drive device 7 is disposed below the entrance 1b, but may be disposed above the entrance 1b or on the vehicle body 1a inside the rear compartment of the entrance 1b. .

In the above embodiment, the flexible flat cable 19 is used, but other flexible (flexible) cables may be used. In the above embodiment, the present invention is applied to a sliding door of a vehicle, but may be applied to other general sliding doors.

[0064]

As described in detail above, according to the present invention,
Even when the slide door is open, it is possible to supply power to the electrical equipment arranged in the slide door, and to prevent the opening and closing operation of the slide door from being hindered, and to take into account the ease of assembly. A door power supply structure can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic view of a vehicle having a sliding door according to an embodiment.

FIG. 2 is a schematic configuration diagram of a slide drive device.

FIG. 3 is a cross-sectional view of a rotary drive device.

FIG. 4 is a perspective view showing a winding unit and a sprocket.

FIG. 5 is an explanatory view showing a winding section in a fully closed state of the slide door.

FIG. 6 is an explanatory diagram showing a winding unit during an opening and closing operation of a slide door.

FIG. 7 is an explanatory view showing a winding section in a fully opened state of the slide door.

FIG. 8 is a block diagram showing an electrical configuration of the slide door opening and closing device.

[Explanation of symbols]

1a: vehicle body, 1b: doorway as opening, 2 ...
Slide door, 2a door stay, 3 handle switch as electric device, 4 pressure-sensitive switch as electric device, 5 door lock device as electric device, 6 door controller as electric device, 11 electric motor , 1
7: tension device as a moving body; 18: winding unit as winding means; 18b: fixed drum as power supply side connection unit; 19: flexible flat cable as power supply line; 19a, 19b: connector; 19d: connection Wiring as means, 20 ... battery as power supply.

Claims (4)

[Claims] 1. An opening (1b) by sliding.
Power supply structure for a sliding door that supplies power from an electric power source (20) disposed outside the door (2) to electric equipment (3 to 6) disposed on the sliding door (2) that opens and closes the door. A door stay (2b) extending from the sliding door (2).
A moving body (17) connected to the door (2) in the opening and closing direction of the door (2); a power supply side connection portion (18b) electrically connected to the power supply (20); 19a, 19b), and one connector (19a) is inserted and fixed in the power supply side connection part (18b), and the other connector (19b) slides with the moving body (17), the door stay (2b). Power supply line (1) inserted and fixed to any one of the doors (2)
9) winding means (18) for rotating in synchronization with opening and closing movement of the slide door (2) to wind and rewind the power supply line (19); and the other connector (19b). The electric equipment (3 to
6. A power supply structure for a sliding door, comprising: connecting means (19d) for electrically connecting the power supply to the sliding door. 2. The power supply structure for a slide door according to claim 1, wherein the moving body moves in an opening and closing direction of the slide door based on rotation of an electric motor. A door (2) for opening and closing, wherein the winding means (18) rotates based on the rotation of the motor (11) to wind and rewind the power supply line (19). A power supply structure for a sliding door. 3. The power supply structure for a slide door according to claim 1, wherein the power supply line (19) is formed of a flexible flat cable. 4. The power supply structure for a slide door according to claim 1, wherein the slide door (2) is a vehicle slide door slidably supported on a vehicle body (1a). A power supply structure for a sliding door.