JP3411430B2 - Key interlock mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle key interlock mechanism.

[0002]

2. Description of the Related Art In a shift lever device used for shifting an automatic transmission of an automobile, a shift lever device and a key cylinder are connected to each other, and the key cylinder is operated only when the shift lever is shifted to a specific shift range. It is equipped with a key interlock mechanism that allows the ignition key to be pulled out, which prevents accidental removal of the ignition key.

In this type of key interlock mechanism, it is known that the key cylinder of the ignition switch is constrained by a key interlock solenoid.

That is, in this type of key interlock mechanism, a sensor for detecting the position of the shift lever is provided, and when this sensor detects a state in which the shift lever is shifted to the parking range, the shift lock control computer causes the key to be locked. Energize the interlock solenoid.

The key interlock solenoid is disengaged from the key cylinder in the non-energized state, allows rotation in a predetermined direction by the ignition key of the key cylinder, and engages with the key cylinder when energized. Block the rotation of the key cylinder and block the ignition key from being pulled out.

[0006]

However, in the key interlock mechanism having the above-mentioned configuration, expensive parts and devices such as a key interlock solenoid and a shift lock control computer are frequently used, which causes a problem of high cost. is there.

In view of the above facts, an object of the present invention is to obtain a key interlock mechanism which can be manufactured at a low cost.

[0008]

Means for Solving the Problems] key interlock Organization of claim 1, wherein the arbitrary shift range among a plurality of shift ranges including the parking range by shifting the shift lever in a predetermined direction A key interlock mechanism applied to a selectable shift lever device, which unlocks the key cylinder only when the shift lever is shifted to the parking range to enable the ignition key to be removed from the key cylinder. And independently of the shift lever
Parking provided on a front-rear shaft having an axis in the front-rear direction of the vehicle and rotatably supported by the shift lever , which is shifted to the parking range, and is rotated by a predetermined angle around the front-rear axis. The position detection member and the shift lever
-And separately from the parking position detection member
It is provided rotatably on a vertical shaft whose axis is in the vehicle height direction, and is rotated by pressing force from the shift lever.
An operating member that is pressed by the parking position detecting member and rotates a predetermined angle around the vertical axis, and one end of the operating member.
It is connected to the member and the other end is connected to the key cylinder.
Is rotated by being pressed by the parking position detecting member.
Is pulled by the operating member to lock the key cylinder.
Cable that releases the locked state and the parking position detection
The operation is performed in the direction opposite to the rotation direction when the member is pressed.
And a biasing member that constantly biases the member .

In the key interlock mechanism having the above structure,
When shifting the shift lever to the parking range,
A parking position detecting member provided separately from the shift lever is pressed by the shift lever , and the parking position detecting member is rotated around the front-rear axis by a predetermined angle. Further, the shift position is pressed and the parking position detector is detected.
When the material rotates, the parking position detection member and the shift
Perkin is an operating member that is provided separately from the bar.
The operation member is pressed by the position detecting member, and the operation member is rotated about the vertical axis by a predetermined angle against the urging force of the urging member.

As a result, the cable whose one end is connected to the operating member is pulled and operated by the rotating operating member, and the locked state of the key cylinder is released. Therefore, the ignition key can be removed from the key cylinder.

If the shift lever is shifted from this state to a shift range other than the parking range,
The pressing force applied to the parking position detecting member by the shift lever is released. Therefore, the urging force of the urging member causes the operating member to rotate at a predetermined angle in a direction opposite to the rotation direction at the time of unlocking, and is held at a predetermined position. by this,
The tension with which the operating member pulls out the cable is released, and the key cylinder is locked again.

Thus, unlike the conventional key interlock mechanism, the present key interlock mechanism does not require expensive parts and devices such as a key interlock solenoid and a shift lock control computer, and is inexpensive. Can be manufactured. The key interro according to claim 2.
The lock mechanism shifts the shift lever in the specified direction.
Multiple shift ranges including parking range
Shift that allows any shift range to be selected from
It is applied to a lever device, and the shift lever is
The key cylinder only when shifting to the gear range.
Key cylinder for ignition key
Key interlock mechanism that allows removal from the key
And below the housing of the shift lever device
And in the vicinity of the shift lever,
Installed separately and independently, with the vehicle longitudinal direction as the axial direction
Is rotatably supported by the front and rear shafts,
Is pushed by the shift lever that is shifted to
A parking position detection member that rotates about an axis by a predetermined angle,
The shift lever is provided below the parking position detecting member.
And separately from the parking position detecting member.
It is possible to rotate on the vertical axis with the vehicle height direction as the axis direction.
Is pivotally supported and rotates with the pressure from the shift lever.
The vertical axis is pressed by the parking position detecting member
An operation member that rotates around a predetermined angle and one end of the operation member
And the other end is connected to the key cylinder.
And is rotated by being pressed by the parking position detecting member.
The key cylinder is locked by being pulled by the operating member.
Cable for releasing the state, and the parking position detector
The operation portion is in the direction opposite to the rotation direction when pressed by the material.
A biasing member that constantly biases the material,
ing. The key interlock mechanism with the above configuration
If you shift the lever to the parking range,
Separated from the shift lever near the shift lever below
Independently provided parking position detection member shifts
Pressed by the lever, the parking position detection member moves back and forth.
It is rotated about the axis by a predetermined angle. Furthermore, on the shift lever
When it is pressed and the parking position detection member rotates,
Below the king position detection member, the parking position detection member and
And operating member provided separately from the shift lever
Is pressed by the parking position detection member and the operation member
Rotate a predetermined angle around the vertical axis against the urging force of the urging member .
Be done. This allows the cable with one end connected to the operating member.
Is operated by being pulled by the rotating operation member,
The cylinder lock is released. Because of this, igu
Can be removed from the key cylinder of the nitshon key
Becomes Also, from this state, move the shift lever
Shift operation to a shift range other than Grange will cause a shift.
The pressing force on the parking position detection member by the lever is released.
Be erased. Therefore, the operating member does not use the biasing force of the biasing member.
Therefore, it is rotated a predetermined angle in the opposite direction to the rotation direction when unlocking.
It is moved and held in place. This allows the operation
The tension that the member pulls out the cable is released, and the key is pressed again.
Linder is locked. This way, this key
Interlock mechanism, conventional key interlock mechanism
Unlike key interlock solenoids and shift
Expensive components and equipment such as
It is not necessary and can be manufactured at a low cost. Claim 3
The key interlock mechanism on the
By shifting the shift lever in the left and right direction of the vehicle,
Select from multiple shift ranges including the parking range
Shift lever device that can select the desired shift range
The shift lever is applied to the parking range.
Lock the key cylinder only when it is shifted to
Release it and remove the ignition key from the key cylinder.
A key interlock mechanism that enables scraping,
Below the housing of the shift lever device and above the shaft.
Independent of the shift lever, separate from the shift lever
Is installed in the front-rear axis with the vehicle front-rear direction as the axial direction.
It is rotatably supported and shifts to the parking range.
Is pressed by the shift lever that has been
The parking position detecting member that rotates at a constant angle and the park
The shift lever and the pas
It is installed separately from the marking position detection member and
It is rotatably supported on the vertical axis with both height directions as the axial direction.
And is rotated by the pressing force from the shift lever.
Pressed by the king position detection member and predetermined around the vertical axis
The operating member that rotates at an angle and one end connected to the operating member.
And the other end is connected to the key cylinder.
For operating members that are rotated by being pressed by the marking position detection member
Pulled more to release the locked state of the key cylinder
Cable and the parking position detection member
Always attach the operating member in the direction opposite to the rotating direction when
And a biasing member for biasing. Up
With the key interlock mechanism with the above structure,
Also, operate the shift lever in the right and left direction of the vehicle,
When you shift to the grange, the shift
Provided separately from the shift lever near the bar and independently
The parking position detection member is pressed by the shift lever.
The parking position detection member is rotated a predetermined angle around the front-rear axis.
Be moved. Furthermore, it is pressed by the shift lever and
When the position detecting member rotates, the parking position detecting member
What is the parking position detection member and shift lever below
The operating member, which is provided separately and independently, detects the parking position.
Pressed by the eject member, the operating member becomes the urging force of the urging member.
Against it, it is rotated by a predetermined angle around the vertical axis. This allows
A cable whose one end is connected to the operating member
Operated by being pulled by the member, lock the key cylinder
The state is released. For this reason, the key of the ignition key
-It can be removed from the cylinder. Also this
From the state, shift the shift lever to a position other than the parking range.
When shifting to the range, the shift lever
The pressing force on the king position detecting member is eliminated. According to
The operating member is unlocked by the urging force of the urging member.
Is rotated at a predetermined angle in the direction opposite to the rotation direction of
Held in. This allows the operating member to pull the cable.
The tension that comes out is released and the key cylinder locks again.
Is put in a state. In this way, this key interlock mechanism
Unlike the conventional key interlock mechanism,
Center lock solenoid and shift lock control
Inexpensive because it does not require expensive parts or devices such as computers
Can be manufactured at cost. The key interface according to claim 4.
The lock mechanism is described in any one of claims 1 to 3.
In the key interlock mechanism described above, the parking
The position detecting member has the seal on one end side with the vertical axis as a boundary.
It is pressed by the shift lever and at the other end side with the vertical axis as a boundary.
The operation member is pressed, and the operation member moves the front and rear shafts.
It is pressed against the parking position detection member at one end, which is the boundary.
And the cable is connected to the other end side with the front-rear axis as a boundary.
It is characterized by Key interface with the above configuration
-The lock mechanism has a shift lever in the parking range.
When a shift operation is performed, this shift operation causes parking.
The position detection member has a shift lever on one end side with the vertical axis as a boundary.
It is pressed and rotated by. In addition, press the shift lever.
When the parking position detection member rotates due to pressure,
The ring position detection member is an operation member on the other end side with the vertical axis as a boundary.
Press one end side of the front and rear axis as a boundary. This parking
The operation member that receives the pressure from the position detection member at one end
It rotates around the front-rear axis and is connected to the other end of the front-rear axis.
Pull the cable that has been removed. This allows the key cylinder
Is unlocked and the ignition from the key cylinder is
It is possible to pull out the operation key.

[0013]

FIG. 1 is a perspective view showing a main part of a shift lever device 10 to which a key interlock mechanism according to an embodiment of the present invention is applied. 2 is a front view of FIG. 1, and FIG. 3 is a plan view of FIG.

As shown in these figures, the shift lever device 10 includes a shift lever 12.

The shift lever 12 is a rod-shaped member that is long in the vertical direction of the vehicle (not shown) (the direction of arrow Z in FIGS. 1 and 2 and the opposite direction), and is in a state of protruding upward to the upper end of the block 14. It is integrally provided in.

The lower end of the block 14 is attached to the shaft 18 by a pin 16 and is rotatable about the pin 16 in the axial direction of the shaft 18.

The shaft 18 is rotatable about its own axis, and the block 14 mounted on the shaft 18 is rotatable about the axis of the shaft 18.

That is, the shift lever 12 serves as the axis of the shaft 18 in the longitudinal direction of the vehicle (the arrow Y in FIGS. 1 and 3).
Direction and the opposite direction) and the pin 1
It is rotatable about the axis 6 in the width direction of the vehicle (the arrow X direction in FIGS. 1 to 3 and the opposite direction).

The end portion of the shaft 18 has a link plate 20.
Is fixed to one end of the link plate 20, and the other end of the link plate 20 is connected to an automatic transmission (both not shown) via a motion transmission mechanism such as a rod.

On the other hand, a bracket 22 is integrally fixed to the side surface of the block 14. A circular hole 24 opening upward is formed in the bracket 22, and a moderation pin 26 and a coil spring 28 are housed inside the hole 24.

The moderation pin 26 is a rod-shaped member elongated in the axial direction of the hole 24, and has an upper end formed in a hemispherical shape.
Coil spring 2 with its upper end protruding from hole 24
8 always urges upward.

Further, a housing 30 is arranged above the block 14. The housing 30 is made of a resin material such as ABS resin and has a box shape, and is fixed to a floor (not shown) in the vehicle interior.

On the ceiling portion 30A of the housing 30,
“P”, “R”, “N” depending on the shift range of the vehicle
A plurality of characters 32 such as is printed.

Here, for example, "P" represents the parking range, and "R" represents the reverse range. Furthermore, "D" represents the drive range.

Further, guide grooves 34 are formed on the sides of these characters 32. The guide groove 34 is bent in the front-rear direction (the arrow Y direction in FIGS. 1 and 3 and the opposite direction) and the left-right direction (the arrow X direction in the FIGS. 1 to 3 and the opposite direction) of the ceiling portion 30A, and the whole is formed. Are formed in a zigzag shape.

In the guide groove 34, the shift lever 12
Is penetrated, and by operating the shift lever 12 along the guide groove 34, it is possible to shift to a desired shift range.

Below the housing 30 having the above structure, a moderation plate 38 is arranged so as to face the moderation pin 26.

On the back surface of the moderation plate 38, a moderation groove (not shown) having a concave shape is formed so as to extend downward as a whole, and the upper end side of the moderation pin 26 is inserted therein.

The moderation groove is bent in zigzag corresponding to the movement locus of the moderation pin 26 that moves integrally with the shift lever 12, and the width of the moderation groove (that is, with respect to the movement direction of the moderation pin 26). The length in the right angle direction) is substantially equal to the diameter of the tip of the moderation pin 26. Furthermore, the bottom of the moderation groove is formed in a continuous uneven shape,
When the moderation pin 26 is located in a specific shift range, the movement to another shift range is restricted by the biasing force of the coil spring 28 and the concavity and convexity of the moderation groove.

As a result, the moderation plate 38 (moderation groove) restricts the movement of the moderation pin 26 while controlling the moderation pin 26.
Is guided to a specific shift range.

An interlock link release 46 as a parking position detecting member is arranged below the moderation plate 38 having the above structure.

This interlock link release 46
Is a plate-shaped member that is elongated in the vehicle up-down direction, and has a through hole 48 formed in the vehicle longitudinal direction at an intermediate portion in the longitudinal direction. A pin 50 as a front-rear shaft is disposed through the through hole 48, and the interlock link release 4
6 is rotatable about the axis of the pin 50 (the direction of arrow A in FIGS. 1 and 2 and the opposite direction).

Also, interlock link release 46
Is bent in a hook shape, and a rectangular pressed portion 46A is provided at the tip thereof.

This pressed portion 46A is the shift lever 12
Bracket shifts to the parking range
Face the side of. As a result, the pressed portion 46A is pressed by the shift lever 12, and the interlock link release 46 is rotated by a predetermined angle in the counterclockwise direction (direction of arrow A in FIGS. 1 and 3).

Further, interlock link release 4
The lower end of 6 is a pressing portion 46B.
A plate interlock 52 as an operating member is arranged near 6B.

The plate interlock 52 is a plate-like member formed in an L shape in plan view, and is located at the center of the intersection of the L shape in the vehicle height direction (the arrow Z direction in FIGS. 1 and 2 and A through hole 54 is formed so as to penetrate in the opposite direction. A pin 56 as a vertical axis is arranged through the through hole 54, and the plate interlock 52 is rotatable around the axis of the pin 56 (the arrow B direction in FIGS. 1 and 3 and the opposite direction). There is.

The L-shaped one end side of the plate interlock 52 is a pressed portion 52A, which is always in contact with the pressing portion 46B of the interlock link release 46. That is, the interlock link release 46 rotates clockwise around the pin 50 (direction of arrow A in FIGS. 1 and 3).
When the plate interlock 52 is rotated in the direction of,
It is configured to be pressed by 6B and rotate by a predetermined angle.

Further, the plate interlock 52 is provided with a spiral spring 58 as a biasing member. The spiral spring 58 has a plate interlock 52 at one end.
, And the other end is locked to the pin 56, so that the plate interlock 52 is always rotated clockwise in a plan view (see FIG. 1).
And in the direction opposite to the arrow B direction in FIG. 3). Thus, the plate interlock 52 maintains a predetermined state when the pressing force is not applied.

Further, this plate interlock 52
A columnar cable locking portion 60 is provided at the other end of the key interlocking cable 62, and one end of the key interlock cable 62 is locked.

The other end of the key interlock cable 62 is attached to a cam (not shown) provided inside the key cylinder 64, and the key cylinder 64 is locked according to the tension of the key interlock cable 62. It is configured to be in the state and the unlocked state.

Next, the operation of this embodiment will be described. In the shift lever device 10 having the above configuration, the shift lever 12
When is operated back and forth and left and right along the guide groove 34, the moderation pin 26 is guided by the moderation groove of the moderation plate 38 and moves to a specific shift position corresponding to the operation of the shift lever 12 with a sense of moderation. And shifts to a specific shift range.

Here, as shown in FIGS. 4 and 5,
When the shift lever 12 is shifted to the parking range, the side surface of the bracket 22 of the shift lever 12 contacts the pressed portion 46A of the interlock link release 46, and the interlock link release 46 moves in the same direction as the shift lever 12 moves. Is pushed to. by this,
The interlock link release 46 rotates at a predetermined angle in the clockwise direction (the direction of arrow A in FIGS. 1 and 2) about the pin 50, that is, after the side surface of the bracket 22 contacts the pressed portion 46A, the shift lever 12 is completely moved. It is rotated in accordance with the movement stroke until it is shifted to the parking range.

Then, the pressing portion 46B of the rotated interlock link release 46 presses the pressed portion 52A of the plate interlock 52. As a result, the plate interlock 52 is rotated about the pin 56 in the counterclockwise direction (arrow B direction in FIGS. 1 and 3) by a predetermined angle against the biasing force of the spiral spring 58.

Further, as the plate interlock 52 rotates, the key interlock cable 62 locked to the cable locking portion 60 of the plate interlock 52 is rearwardly of the vehicle with a predetermined tension (see FIGS. 1 and 3). It is pulled out in the direction of arrow C) and the cam inside the key cylinder 64 is operated. As a result, the locked state of the key cylinder 64 is released, and the ignition key can be pulled out.

On the other hand, when the shift lever 12 is shifted to a position other than the parking range from this state, the pressing force applied to the interlock link release 46 by the bracket 22 is released, so that the plate interlock is caused by the urging force of the spiral spring 58. The lock 52 turns to the right (see FIGS. 1 and 3).
In the direction opposite to the arrow B). As a result, the pressing portion 46B of the interlock link release 46 is pressed by the pressed portion 52A of the plate interlock 52, which is opposite to the pressing force, and the interlock link release 46 rotates counterclockwise about the pin 50 (FIG. 1). And the opposite arrow A in FIG.
Direction).

When the plate interlock 52 is rotated by the urging force of the spiral spring 58, the tension of the key interlock cable 62 is reduced, whereby the cam provided inside the key cylinder 64 operates, The key cylinder 64 is locked. As a result, the ignition key is prevented from being pulled out until the shift lever 12 is shifted to the parking range again.

As described above, in the key interlock mechanism applied to the shift lever device 10 having the above structure, the interlock link release 46, the plate interlock 52, and the key interlock cable 62 are provided.
Since the configuration in which the shift lever 12 is shifted to the parking range is detected by mechanical and simple motion transmission, and the lock state and the unlock state of the key cylinder 64 are controlled, a key interlock solenoid and a shift lock are provided. Costs can be reduced without requiring expensive parts or devices such as a control computer.

[0048]

As described above, in the key interlock mechanism according to the present invention, the parking position detecting member,
A mechanical and simple motion transmission mechanism consisting of an operating member and a cable detects that the shift lever has been shifted to the parking range, and locks and unlocks the key cylinder. The cost can be reduced without requiring an expensive control member.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a shift lever device to which a key interlock mechanism according to an embodiment of the present invention is applied.

FIG. 2 is a front view of a shift lever device to which a key interlock mechanism according to an embodiment of the present invention is applied.

FIG. 3 is a plan view of a shift lever device to which a key interlock mechanism according to an embodiment of the present invention is applied.

FIG. 4 is a front view corresponding to FIG. 2, showing the unlocked state of the key interlock mechanism according to the embodiment of the present invention.

FIG. 5 is a plan view corresponding to FIG. 3, showing the unlocked state of the key interlock mechanism according to the embodiment of the present invention.

[Explanation of symbols]

10 shift lever device 12 shift lever 46 interlock link release (parking position detection member) 50 pin (front and rear axis) 52 plate interlock (operation member) 56 pin (vertical axis) 58 spiral spring (biasing member) 62 key interlock Cable (cable) 64 key cylinder

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) B60K 20/00-20/08 F16H 59/00-59/12 G05G 1/00-25/04

Claims (4)

(57) [Claims] 1. The present invention is applied to a shift lever device in which an arbitrary shift range can be selected from a plurality of shift ranges including a parking range by shifting the shift lever in a predetermined direction. A key interlock mechanism that allows the ignition key to be removed from the key cylinder by releasing the locked state of the key cylinder only when shifting to the parking range, and is provided separately from the shift lever. And is rotatably supported by the front-rear axis having the vehicle front-rear direction as its axis
The shift lever shifted to the parking range
The parking position detecting member that is pressed by the rotary shaft and rotates about the front-rear axis by a predetermined angle, and the shift lever and the parking position detecting member.
Provided independently separately, it is rotatably supported in the vertical axis of the vehicle height direction as the axial direction, from the shift lever
Pressed against the parking position detection member that rotates with the pressing force of
And an operating member which is rotated around the vertical axis by a predetermined angle, one end of which is connected to the operating member and the other end of which is the key.
It is connected to the cylinder and pushed to the parking position detection member.
The key is pulled by an operating member that is pressed and rotated.
Cable for unlocking the cylinder and rotation direction when pressed by the parking position detection member
A biasing member that constantly biases the operating member in a direction opposite to
Key interlock mechanism, characterized in that it comprises a and. 2. A shift lever is shifted in a predetermined direction.
By doing so, multiple shift range including parking range
A shift that allows any shift range to be selected from
The shift lever is applied to the
Only when shifting to the king range of the key cylinder
Release the lock state and turn the ignition key
Key interlock machine that can be removed from the drawer
The structure is below the housing of the shift lever device and the
Independent of the shift lever, separate from the shift lever
Is installed in the front- rear axis with the vehicle front-rear direction as the axial direction.
It is rotatably supported and shifts to the parking range.
Is pressed by the shift lever that has been
A parking position detecting member that rotates at a constant angle, and the shift lever below the parking position detecting member.
And separately from the parking position detecting member.
It is possible to rotate on the vertical axis with the vehicle height direction as the axis direction.
Is pivotally supported and rotates with the pressure from the shift lever.
The vertical axis is pressed by the parking position detecting member
An operating member that rotates around a predetermined angle, one end of which is connected to the operating member and the other end of which is the key.
It is connected to the cylinder and pushed to the parking position detection member.
The key is pulled by an operating member that is pressed and rotated.
Cable for unlocking the cylinder and rotation direction when pressed by the parking position detection member
A biasing member that constantly biases the operating member in a direction opposite to
Key interlock mechanism, characterized in that it comprises a and. 3. Shear in the front-rear direction of the vehicle and in the left-right direction of the vehicle.
By shifting the left lever, the parking range can be increased.
Any shift range from multiple shift ranges including
Is applied to the shift lever device that can be selected,
The state where the shift lever is shifted to the parking range
Only when the key cylinder is unlocked and the ignition is
It is possible to remove the key from the key cylinder
A key interlock mechanism, which is below the housing of the shift lever device
Independent of the shift lever, separate from the shift lever
Is installed in the front-rear axis with the vehicle front-rear direction as the axial direction.
It is rotatably supported and shifts to the parking range.
Is pressed by the shift lever that has been
A parking position detecting member that rotates at a constant angle, and the shift lever below the parking position detecting member.
And separately from the parking position detecting member.
It is possible to rotate on the vertical axis with the vehicle height direction as the axis direction.
Is pivotally supported and rotates with the pressure from the shift lever.
The vertical axis is pressed by the parking position detecting member
An operating member that rotates around a predetermined angle, one end of which is connected to the operating member and the other end of which is the key.
It is connected to the cylinder and pushed to the parking position detection member.
The key is pulled by an operating member that is pressed and rotated.
Cable for unlocking the cylinder and rotation direction when pressed by the parking position detection member
A biasing member that constantly biases the operating member in a direction opposite to
Key interlock mechanism, characterized in that it comprises a and. 4. The parking position detecting member is the upper part.
Pressed by the shift lever at one end side with the lower shaft as a boundary,
The operation member is pressed at the other end side with the vertical axis as a boundary, and the operation member has the pad at one end side with the front and rear axis as a boundary.
Pressed by the marking position detection member, with the front-rear axis as a boundary
That said cable at the other end is connected, it to any one of claims 1 to 3, characterized in
Key interlock mechanism described.