JPH09303024A - Door lock device for construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact door lock device with a simple structure in which an outer handle can be rotated with a light force in the lock released state of a door. SOLUTION: This device is formed of an inner handle-side link 16 interlocked with the inner handle 32 of a door, an outer handle-side link 15 interlocked with the outer handle, a connecting plate 21 for mutually connecting both the links, and a cam plate 26 making contact with the connecting plate 21 by the rotation operation of a key cylinder 41. A pin 20 is provided on one of the connecting plate 21 and the outer handle-side link 15, and a substantially L- shaped pin hole in which the pin 20 is movable is provided on the other, so that the connecting plate 21 is connected to the outer handle-side link 15 through the pin 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a construction machine such as a hydraulic excavator and a door for an entrance / exit of a driver's cab of a working vehicle, and is adapted to maintain a locked or unlocked state of the door. Regarding

[0002]

2. Description of the Related Art FIG. 5 is a perspective view of an embodiment of a slide door lock opening / closing mechanism disclosed in Japanese Utility Model Laid-Open No. 5-3550. In the lock opening / closing mechanism shown in FIG. 5, when the key cylinder 41 is set to the lock position, the pin 42 rises in the elongated holes 43a and 44a of the intermediate levers 43 and 44 to reach the lock position. At this time, set the door handle 45 to the intermediate lever 43.
And 44 do not interlock, and only the intermediate lever 44 moves. Therefore, even if the door handle 45 is moved, the lock is not released.

Next, FIG. 6 is an external perspective view of a cab for a cab mounted on a hydraulic excavator (not shown). In the figure, 1 is a cab body, 2 is a door having a door lock device that has been conventionally used, 3 is an outer handle of the door 2, and 4 is a key (not shown), and the door 2 is locked. Alternatively, the key cylinder is operated to switch to the unlocked state. FIG. 7 is a view as seen from AA of FIG. 6, but the direction of the drawing is changed so that the upper side of FIG. 7 is the outside of the door 2 and the lower side is the interior side. In the figure, 5 is a link lever that operates in conjunction with the door opening / closing operation of the outer handle 3, and 6 is a link lever 5 and a slide plate 7.
And 8 are outer wires stretched between them, rollers 8 provided on the key cylinder 4 and interlocking with each other in response to a key operation on the key cylinder 4, and 9 and 10 are guide rollers for preventing the outer wire 6 from coming off. . FIG. 8 is FIG.
Although it is a view as seen from B-B in FIG. 1, the dimensions and the positional relationship are shifted for ease of explanation. In the figure, 11 is an inner wire connected to an inner handle (a handle provided on the interior side of the door 2) not shown, and 31 is for locking the door 2 when the door 2 is open (so-called door open state). A lock operating structure for opening, 33 is a lock operating structure for closing state that locks the door 2 when the door 2 is closed, and 12 is a lock operating structure for lock closed state 33 or a lock operating structure for open 31 Is a link plate that is swingably arranged to perform the lock / unlock drive of the.

Next, the operation of the door lock device shown in FIGS. 7 and 8 will be described. When the key for unlocking the key cylinder 4 is operated, the roller 8 is at the position a as shown in FIG.
The outer wire 6 is in a tensioned state. Also key cylinder 4
When the lock key is operated, the roller 8 is rotated around the axis 0 of the key cylinder 4 and is in the B position (shown by a virtual line).
Stop at. Therefore, the tension of the outer wire disappears,
Will loosen. That is, when the door 1 is locked as described above, for example, even if the outer handle 3 is opened and rotated to confirm whether or not the door 1 is securely locked, it is connected to the link lever 5. Since the outer wire 6 is loosened, the outer handle 3
The opening and rotating operation of is a so-called empty swing. Therefore, when the outer handle 3 is allowed to idle in this way, even if the outer handle 3 is opened and rotated by an excessive force, the excessive force does not act on the link structure of the door lock device. Good maintainability of the device can be maintained.

[0005]

In the lock opening / closing mechanism of the sliding door shown in FIG. 5, it is necessary to arrange three plates (intermediate levers 43, 44, and 46) in parallel in a narrow space in the width direction of the door. However, it was difficult to make the door thinner. Further, all of the three pin holes of the plate into which the pins 42 are fitted need to be elongated holes (43a, 44a, 46a), and moreover, since the pin 42 transmits the key rotation operation to the mechanism, the structure is complicated. Becomes Further, in the door lock device shown in FIG. 8, when the key release key of the key cylinder 4 is operated, the roller 8 is in the a position and the outer wire 6
Becomes nervous. When the outer handle 3 is rotated in order to open the door 1 in this state, the roller 8 is provided in the path of the outer wire 6, the guide rollers 9 and 10 for preventing wire detachment, and the slide plate is provided at the connecting portion between the inner wire 11 and the outer wire 6. Since 7 is arranged, the operation (sliding) resistance of each of the above parts is large and a large manual operation force is required. Since the turning operation of the outer handle 3 is not light, not only the operation feeling is bad, but also the maintainability of the door lock device is not good. INDUSTRIAL APPLICABILITY The present invention can maintain the function of the outer handle in the idling state when the door is in the locked state, and can rotate the outer handle with a light force when the door is in the unlocked state.
Moreover, it is an object of the present invention to provide a door lock device which has a simple structure and can be easily attached to a thin door.

[0006]

According to the present invention, a construction is provided which includes an inner handle capable of opening and closing the door from inside the cab, an outer handle capable of opening and closing from the outside of the cab, and a key cylinder which can be locked from the outside of the cab when the door is closed. In a cab of a machine, an inner handle side link that interlocks with the inner handle, an outer handle side link that interlocks with the outer handle, and a connecting plate that connects the inner handle side link and the outer handle side link,
A cam plate that comes into contact with the connecting plate when the key cylinder is rotated, and a pin is fixed to one of the connecting plate and the outer handle side link, and the other pin is movable in a substantially L shape. A pin hole having a shape is provided, and the connecting plate and the outer handle side link are connected via a pin. In the above case, a pin is fixedly provided on one of the inner handle side link and the connection plate, and a slotted pin hole is provided on the other side so that the pin can be moved, and the fixing member is provided with the outer handle side link and the inner plate. The handle-side links are pivotally attached via pins, respectively, the connecting plate is connected between the outer handle-side link and the inner handle-side link, and the middle of the connecting plate and the outer handle-side link are connected by a coil spring.

In the present invention, when the key for unlocking the key cylinder is first operated, the cam pin portion of the cam plate provided on the key cylinder is in a non-contact state with the connecting plate, and the pin protruding from the outer handle side link is provided. Engages with the door unlocked position hole at the upper end of the L-shaped slot. In this state, if you rotate the outer handle to open the door,
The outer handle side link and the inner handle side link and the link plate rotate through the connecting plate. The operating resistance of each of the above-described components during rotation is significantly smaller than the operating (sliding) resistance of each component of the conventional door lock device. Therefore, the outer handle when the door is unlocked can be rotated with a small manual operation force. That is, since the turning operation of the outer handle is light when opening the door in the unlocked state of the door, the operation feeling can be significantly improved.

Next, when the lock key of the key cylinder is operated, the cam pin portion of the cam plate provided on the key cylinder comes into contact with the connecting plate to push up and displace the connecting plate. The pin protruding from the outer handle side link is located at a position corresponding to the lower end of the longitudinal slot in the door lock state position hole having a play allowance at the lower side of the L-shaped slot of the connecting plate. Engage. In this state, for example, when the outer handle is opened and rotated to confirm whether or not the door is securely locked, the outer handle side link rotates in conjunction with the rotation of the outer handle. However, in that case, the pin protruding on the outer handle side link moves by a play allowance length toward the tip side at the lower side of the L-shaped elongated hole of the connecting plate. Therefore, since the connecting plate and the link on the inner handle side remain stationary, the opening and turning operation of the outer handle is a so-called idle swing. That is, if the outer handle can be swung in this manner, even if the outer handle is opened and rotated by an excessive force, the excessive force does not act on the link structure of the door lock device. Maintainability can be maintained.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a main part of the door lock device of the present invention as viewed from the inside of the cab to the outside. The key cylinder 4'of the door 2'is an unlock key (the key is not shown). Indicates the operated state. In the figure, 14 is an outer wire, 15 is an outer handle side link, 16 is an inner handle side link, 17, 18
Is a fulcrum pin above each of the links 15 and 16,
Reference numerals 19 and 20 denote pins that are fixed to the links 15 and 16, respectively, and project from the links, 21 is a connecting plate, 22 is a long hole for engaging the pin 19 of the connecting plate 21, and 23 is an upper end portion of the long hole 22. Door lock release position hole, 24
Is a door lock state position hole having a play allowance at the lower side of the slot 22; 25 is a rod connected to an inner handle (handle provided on the indoor side of the door 2 ') 32;
Is a cam plate provided on the key cylinder 4 ', 27 is a cam plate 26
Cam pin portions projectingly formed at the respective positions, 28 and 29 are coil springs, 31 is a lock actuating structure portion for opening the door 2'when the door 2'is in an opened state (so-called door open state), and 33 is a door 2 '. In order to perform the lock / unlock drive of the closed state lock operating structure 33 or the open state lock operating structure 31, which locks the door 2'when the door is closed. A link plate disposed so as to be swingable is a rod with an adjusting screw portion that connects the inner handle side link 16 and the link plate 30. FIG.
[Fig. 2] is a perspective view showing essential parts of the door lock device in Fig. 1. FIG. 3 is a diagram showing a state in which the key cylinder 4 ′ in FIG. 1 is operated by a lock key. In the figure, the dimension 1 is the door lock state position hole 24 at the lower side of the slot 22.
Play allowance length, angle θ is the outer handle side link 15
Is a play angle at which play swing can be performed around the fulcrum pin 17.

Next, the structure of the door lock device of the present invention will be described with reference to FIGS. In the present invention, the outer handle 3 of the door 2 ′ that is opened and closed from the outside is interlocked (pin 31
An outer handle side link 15 that rotates by interlocking via a link lever 5 and an outer wire 14 fixed to the outer handle 14 is provided inside the door 2 ′, and an inner handle side link 16 that rotates in conjunction with the inner handle 32 is the outer handle. The inner handle side link 16 and the outer handle side link 15 are connected to each other via a connecting plate 21, and the pin 19 is fixed to the outer handle side link 15. And a door lock release position hole 23 and a door lock position hole 24 having a play allowance are formed in the connecting plate 21.
The pin 19 is movably fitted in the holes 23 and 24. In this case, the door lock release state position hole 23 and the door lock state position hole 24 having a play allowance are formed by the elongated hole 22 in which the diameter portion of the pin 19 is movable in the direction orthogonal to the pin axis. Opening, the longitudinal shape of the elongated hole 22 is L-shaped, the upper end of the L-shaped hole is the door lock unlocked position hole 23, and the lower side of the L-shaped is a door lock position hole having a play allowance. It was set to 24. A cam plate 26 that rotates in conjunction with the key operation of the key cylinder 4'is provided on the key cylinder 4 ', and the cam plate 26 corresponds to the unlock key operation of the key cylinder 4'.
The connecting plate 21 is pushed up and displaced by abutting the cam pin portion 27 of the above, and the above-mentioned pin 19 and the door lock release state position hole portion 23 are set in the engaged state, and the lock key operation of the key cylinder 4'is supported. The non-contact of the cam pin portion 27 sets the pin 19 and the door lock state position hole portion 24 in the engaged state.

Further, according to the present invention, a coil spring 28 is provided between a portion of the cam plate 26 of the cam plate 26, which is on a substantially line connecting the axis 0'of the key cylinder 4 ', and one fixing portion of the door 2'. A lock release operation position of the cam plate 26 (a position where the cam pin portion 27 is rotated downward, for example, as shown in FIG. 2) and a lock operation position (the cam pin portion 27 is rotated, for example, upwardly as shown in FIG. 4). The moved position) is set in a vertical positional relationship centered on the axis 0 ′ of the key cylinder 4 ′.

Next, the operation of the door lock device of the present invention will be described. In the present invention, when the unlock key is first operated on the key cylinder 4 ', as shown in FIG. 1, the cam pin portion 27 of the cam plate 26 provided on the key cylinder 4'is in a non-contact state with the connecting plate 21, and the The pin 19 projecting from the handle side link 15 engages with the door unlocked state position hole 23 at the upper end of the L-shaped elongated hole 22. When the outer handle 3 is rotated to open the door 2'in this state, the outer handle side link 15 and the inner handle side link 16 and the link plate 30 are rotated via the connecting plate 21. The operational resistance of each of the above-described components during the pivotal operation is significantly smaller than the operational (sliding) resistance of each of the components of the conventional door lock device (shown in FIG. 8). Therefore, the outer handle 3 can be rotated with a small manual operation force when the door is unlocked. That is, when the door 2'is opened in the door unlocked state, the turning operation of the outer handle 3 is light, so that the operation feeling can be remarkably improved.

Next, when the lock key of the key cylinder 4'is operated, the cam pin portion 27 of the cam plate 26 provided on the key cylinder 4'abuts the connecting plate 21 as shown in FIG. The plate 21 is pushed up and displaced. Pin 1 protruding from the link 15 on the outer handle side
Reference numeral 9 denotes a door lock state position hole portion 24 having a play allowance in a lower side portion of the L-shaped elongated hole 22 of the connecting plate 21.
Among these, it engages with the position corresponding to the lower end portion of the longitudinal slot (the position is not shown, but it is the position shown in FIG. 3). In this state, for example, when the outer handle 3 is opened and rotated to confirm whether or not the door 2'is securely locked, the outer handle side link 15 is rotated in conjunction with the rotation of the outer handle 3. . FIG.
FIG. 4 is a diagram showing a case where an outer handle 3 (not shown in FIG. 4) is rotated when the door 2 ′ in FIG. 3 is locked. In this case, the outer handle side link 1
The pin 19 projecting from 5 has a length l of play allowance toward the tip side at the lower side of the L-shaped elongated hole 22 of the connecting plate 21 (in this case, the play angle at which the outer handle side link 15 swings). Is an angle θ). Therefore, the connecting plate 21 and the inner handle side link 1
Since 6 is still in a stationary state, the opening and turning operation of the outer handle 3 is a so-called idling. That is, when the outer handle 3 is allowed to swing in this way, even if the outer handle 3 is opened and rotated by an excessive force, the excessive force does not act on the link structure of the door lock device. It is possible to maintain good maintainability.

Further, according to the present invention, the coil spring 28 is provided between a part of the cam plate 26 of the cam plate 26 on a substantial line connecting the axial center 0'of the key cylinder 4'and one fixing portion of the door 2 '. Since the lock release position and the lock operation position of the cam plate 26 are set in a vertical positional relationship around the axis 0 ′ of the key cylinder 4 ′, the key cylinder 4 ′ is provided.
When the lock release key is operated, the cam pin portion 27 of the cam plate 26 can be reliably brought into contact with the connecting plate 21, and when the lock release key operation of the key cylinder 4'is performed, the lock key operation is performed again. When this is done, a clicking sensation that causes a clicking sound and a switching sound is produced, and the operation feeling can be improved.

In the door lock device of the present invention capable of exhibiting the above-mentioned operation, the pins 19 and 20 are fixedly attached to the outer handle side link 15 and the inner handle side link 16, respectively, and the connecting plate 21 is provided with an L-shaped elongated hole 22. Since it is formed, it can be assembled easily and compactly in a narrow space of the door 2 ′ because of its simple structure. Further, the operation of the key is directly transmitted to the mechanism by the crank mechanism (cam plate 26).
As a result, in order to solve the same technical problem as compared with the conventional technique shown in FIG. 5, in the technique of FIG.
3, 44, 46, the pin 42, and the rod 47 are required, whereas the technique according to the present invention only requires the inner handle side link 16 with pins, the mounter handle side link 15, and the connecting plate. Therefore, it can be said that the structure is simpler, the assemblability is better, and the maintainability is better than those of the conventional techniques.

[0016]

According to the present invention, when the key for unlocking the key cylinder is first operated, the cam pin portion of the cam plate provided on the key cylinder is not in contact with the connecting plate and is projected on the outer handle side link. The engaging pin engages with the door unlocked position hole at the upper end of the L-shaped slot. When the outer handle is rotated to open the door in this state, the outer handle side link and the inner handle side link and the link plate are rotated via the connecting plate. The operating resistance of each of the above-described components during rotation is significantly smaller than the operating (sliding) resistance of each component of the conventional door lock device. Therefore, the outer handle when the door is unlocked can be rotated with a small manual operation force. That is, since the turning operation of the outer handle is light when opening the door in the unlocked state of the door, the operation feeling can be significantly improved. Next, when the lock key of the key cylinder is operated, the cam pin portion of the cam plate provided on the key cylinder contacts the connecting plate,
The connecting plate is pushed up and displaced. The pin protruding from the link on the outer handle side is the L of the connecting plate.
Engage in a position corresponding to the lower end of the slotted hole. In this state, for example, if you open and rotate the outer handle to check if the door is securely locked,
With the rotation of the outer handle side link, the pin projecting therefrom moves by the length of the play allowance at the lower side of the L-shaped elongated hole. Therefore, since the connecting plate and the link on the inner handle side remain stationary, the opening and turning operation of the outer handle is a so-called idle swing.
In other words, if the outer handle can be swung in this way, even if the outer handle is opened and rotated with an excessive force, an excessive force does not act on the link structure of the door lock device. Maintainability can be maintained. That is, in the door lock device of the present invention, the pins are fixed to the outer handle side link and the inner handle side link, respectively, and the connecting plate L-shaped oblong hole is formed. And it can be assembled compactly. Further, since the operation of the key is directly transmitted to the mechanism by the cam plate, the structure is simpler than that of the conventional technique, and the assembling property and the maintainability are further improved.

[Brief description of drawings]

FIG. 1 is a side view of a main part of a door lock device according to the present invention as viewed from the inside of a cab to the outside.

FIG. 2 is a perspective view showing essential parts of the door lock device shown in FIG.

FIG. 3 is a diagram showing a state where a lock key is operated on the key cylinder in FIG. 1.

FIG. 4 is a diagram showing a state in which an outer handle is rotated when the door in FIG. 3 is locked.

FIG. 5 is a perspective view of an example of a lock opening / closing mechanism of a conventional slide door.

FIG. 6 is an external perspective view of a cab for a driver's cab equipped on a hydraulic excavator.

FIG. 7 is a diagram viewed from AA in FIG. 6;

FIG. 8 is a diagram viewed from BB in FIG. 7.

[Explanation of symbols]

 2, 2'door 3 outer handle 4, 4 ', 41 key cylinder 15 outer handle side link 16 inner handle side link 19, 20, 42 pin 21 connecting plate 22, 43a, 44a long hole 23 door unlocked position hole 24 Door Lock State Position Hole 26 Cam Plate 27 Cam Pins 28, 29 Coil Spring 32 Inner Handle

Claims (3)

[Claims] 1. A cab of a construction machine having an inner handle that can be opened and closed from inside the cab of the door, an outer handle that can be opened and closed from outside the cab, and a key cylinder that can be opened and closed from outside the cab when the door is closed. An inner handle side link that interlocks with the outer handle side link that interlocks with the outer handle, a connection plate that connects the inner handle side link and the outer handle side link, and the connection plate that is rotated by the key cylinder. A cam plate that comes into contact with the connection plate, a pin is fixedly provided on one of the connection plate and the outer handle side link, and a substantially L-shaped pin hole through which the pin is movable is provided on the other side of the connection plate and the connection plate. A door lock device for a construction machine, characterized in that the outer handle side link is connected through a pin. . 2. The pin according to claim 1, wherein a pin is fixedly provided on one of the inner handle side link and the connecting plate, and an elongated pin hole is provided on the other side so that the pin can move. Door lock device for construction machinery. 3. The outer handle side link and the inner handle side link are pivotally attached to a fixing member via pins, respectively, and the connecting plate is connected between the outer handle side link and the inner handle side link, The door lock device for a construction machine according to claim 1, wherein the middle of the plate and the outer handle side link are connected by a coil spring.