JPH1030371A - Door-opening locking device for driver's cab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the kink of a cable by connecting a control lever to an engaging device through the cable and installing an engaging section between the control lever and the cable. SOLUTION: A control lever 10 is mounted rotatably by a shaft 12 disposed in a bracket 11. A clearance is formed at the front end section of the lever 10 and a plate 16 is faced oppositely and set up, and an upward-recessed shaped engaging section 14 is formed. A cable 5 is inserted into the clearance, and a spherical stopper 6 is put into the engaging section 14. The engaging section 14 is engaged with the stopper 6 and tensile force is applied to the cable 5 when the lever 10 is rotated in the direction that the cable 5 is pulled, but the engagement of the engaging section 14 and the stopper 6 is released when the lever 10 is tuned in the pushing direction. When the lever 10 is revolved in the opposite direction and the lever 10 is released under the state in which the stopper 6 is interlinked with the engaging section 14, the cable 5 is drawn and retaining is released, the lever 10 is returned by a return spring 13. The cable 5 cannot be returned completely and only the lever 10 is rotated at that time. Accordingly, no compressive load is applied to the cable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door open lock device for locking a door of a cab of a construction machine such as a hydraulic shovel or a crane truck or an industrial vehicle when the door is opened.

[0002]

2. Description of the Related Art A conventional door open lock device for a cab of a construction machine such as a hydraulic excavator or a crane truck or an industrial vehicle will be described with reference to FIGS. A door hook 3 is provided on the outer surface of a door 2 provided on the side of the cab 1 shown in FIG. On the outer wall 4 of the cab 1, there is provided a locking device 20 which engages with and locks the door hook 3 which rotates as indicated by a broken arrow when the door 2 is opened. The locking device 20 locks the door hook 3 when the door 2 is opened, and locks the door 2 in an open state.

[0003] An operation lever 1 disposed in the cab 1
Reference numeral 0 is connected to the locking device 20 via the cable 5.
As shown in FIGS. 11 and 12, a forked portion 41 having a pin hole 40 is provided at a distal end portion of the operation lever 10.
A stopper pin 7 fixed to the end of the cable 5 is rotatably inserted into the pin hole 40, and the operation lever 10
When the cable is rocked, the cable 5 is pushed and pulled.

[0004]

However, FIG.
As shown in FIGS. 1 and 12, when the operating lever 10 is swung, the cable 5 is pushed and the pulling force is applied to the cable 5, and in the structure where both pulling forces are applied, the operating lever 10 shown in FIG. When the operation lever 10 is released after the stop is released, the operation lever 10 tries to return in the direction of arrow e by the return spring 13. At this time, a force for pushing down is applied to the stopper pin 7 of the cable 5, but when the cable 5 is rusted or has a high internal resistance due to freezing or the like, it does not return completely, and a compressive load is applied to the cable 5 as shown in FIG. Kink in the S section.
Even when the internal resistance of the cable 5 is small, the cable 5 may buckle while the door is open-locked many times.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a door open lock device for a driver's cab which does not cause kinking or buckling of the cable even when the internal resistance of the cable is large. With the goal.

[0006]

In order to achieve the above object, a first invention of a cab door open lock device according to the present invention comprises: a door hook provided on a cab door; A door opening lock device for a cab, comprising a locking device disposed on an outer wall and locking a door hook when the door is opened, and an operation lever for releasing locking of the door hook and the locking device. The operation lever 10 is configured to be connected to the locking device 20 via the cable 5 and to have an engagement portion 14 between the operation lever 10 and the cable 5 for engaging only in the pulling direction of the cable 5. is there. According to the above configuration, by operating the operation lever, no force for pushing the cable is applied, and even if the internal resistance of the cable increases, the cable does not kink or buckle, so that the durability of the cable is improved. improves.

According to a second aspect of the present invention, in the configuration of the first aspect, the engaging portion is attached to the operating lever and is formed in an open hemispherical or concave shape.
4 and the spherical tip of the cable 5 are configured to engage with each other. According to the above configuration, the engaging portion 14 of the operating lever 10 is formed in an open hemispherical or concave shape, so that when a force in the pushing direction is applied to the cable 5, the spherical portion at the distal end of the cable 5 engages the operating lever 10. By configuring the cable so as to come out of the joint portion 14, a pushing force is not applied to the cable. Therefore, even if the internal resistance of the cable increases, the cable does not kink or buckle, thereby improving the durability of the cable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cab door open lock device according to the present invention will be described below with reference to FIGS.
0 will be described. Components denoted by the same reference numerals as those in FIGS. 11 to 14 are the same components. First, a distal end of an operation lever 10 provided in the cab 1 shown in FIG.
Through the first lever 23 of the locking device 20. The operation lever 10 is rotatably mounted on a bracket 11 fixed to an inner wall of the cab 1 by a shaft 12.
The operation lever 10 is always urged in the direction of the arrow by the return spring 13 and is at the upper position indicated by the solid line.

The details of the locking device 20 will be described with reference to FIG. On the outer side of a bracket 21 fixed to the outer wall 4 of the cab 1 shown in FIG.
2 are provided. A first lever 23 is swingably supported on the inner side of the bracket 21 by a pin 24. One end of the first lever 23 is connected to the cable 5 and the other end is provided with a recess 25. . A second lever 30 is swingably supported by a pin 31 on the outer side of the bracket 21. One end of the second lever 30 has a forked shape, and this forked shape is the first hook 32.
, The second hook 33, the first hook 32 and the second hook 3
3 and a groove portion 34 sandwiched between them. The other end of the second lever 30 has a recess 2 of the first lever 23.
5 is provided with a protrusion 35 that engages with the protrusion 5. The first lever 23 and the second lever 30 are always urged by springs (not shown) so as to rotate about the pins 24 and 31 in the directions of arrows a and b shown in the figure. FIG. 2 shows a state where the door hook 3 is not locked.

Next, the operation of the locking device 20 will be described with reference to FIGS. When the closed door 2 shown in FIG. 10 is opened, the door hook 3 comes to the position shown by the two-dot chain line in FIG. 2 and contacts the first hook 32 of the second lever 30. Further, when the door 2 is opened, the door hook 3 pushes the first hook 32 as shown in FIG. 3 to rotate the second lever 30 in the direction of arrow c against the urging force. It is inserted into the groove 22. At this time, the first lever 23 rotates in the direction of arrow a by the urging force, and the concave portion 25 at the other end engages with the projection 35 of the second lever 30 and is fixed. For this reason, the door hook 3 is clamped by the groove 22 and the groove 34 of the second lever 30, and the door 2 is locked in the open state. This fixing operation is automatically performed by opening the door 2 from the closed state to the maximum.

To release the lock of the door 2, the operating lever 10 is pushed down to the position shown by the two-dot chain line in FIG. Thereby, the first lever 23 shown in FIG. 4 is pulled through the cable 5 and rotates in the direction of arrow d, and the engagement between the concave portion 25 of the first lever 23 and the projection 35 of the second lever 30 is released. You. The second lever 30 rotates in the direction of arrow b as shown in FIG. 5 by the urging force, pushes the door hook 3 by the first hook 32, and releases the lock of the door 2.

Next, an engagement portion between the operation lever 10 and the cable 5 of the cab door open lock device according to the present invention will be described with reference to FIGS. The operating lever 10 shown in FIGS.
2 so as to be freely rotatable. This operation lever 1
A gap 15 through which the cable 5 can pass is provided at the leading end of the plate 0, and a plate 16 is attached facing the plate 16 to form a hemispherical or concave engaging portion 14 which is open at the top. The cable 5 is inserted into the gap 15, and the spherical stopper 6 fixed to the distal end of the cable 5 is inserted into the engaging portion 14. As a result, the operation lever 10 is
When the operating lever 10 rotates in the direction in which the cable 5 is pushed, the engaging portion 14 engages with the spherical stopper 6 to apply a pulling force to the cable 5. Since the engagement between the engagement portion 14 and the spherical stopper 6 is released, no force is applied to the cable 5.
The operation lever 10 is constantly urged in the direction of arrow A by the return spring 13.

The operating lever 10 shown in FIG. 8 is rotated in the direction of arrow B, the spherical stopper 6 of the cable 5 is engaged with the engaging portion 14, and the cable 5 is pulled up to engage the locking device 2.
0 shows a state where the locking of the lock is released. When the operating lever 10 is released in this state, the operating lever 10 is returned by the return spring 13 in the direction of arrow A. At this time, if the internal resistance of the cable 5 is large, the cable 5 does not return completely,
As shown in FIG. 9, the cable 5 remains as it is,
Only the operation lever 10 rotates. Therefore, no compressive load is applied to the cable 5, and no kink or buckling occurs.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a door open lock device.

FIG. 2 is a cross-sectional view illustrating a configuration of a locking device.

FIG. 3 is a diagram showing a state in which a door hook is locked.

FIG. 4 is a diagram illustrating the start of unlocking of a door hook.

FIG. 5 is a view in which the engagement of the door hook is released.

FIG. 6 is a diagram illustrating an engagement state between an operation lever and a cable of the door open lock device according to the present invention.

FIG. 7 is a perspective view of FIG. 6;

FIG. 8 is a diagram illustrating locking and release of the door open lock device.

FIG. 9 is a diagram showing a state in which the operation lever is released.

FIG. 10 is a perspective view of a cab.

FIG. 11 is a diagram illustrating an engagement portion between an operation lever and a cable of a conventional door open lock device.

FIG. 12 is a perspective view of FIG. 11;

FIG. 13 is a diagram illustrating an engagement state between an operation lever and a cable when an unlocking operation of the door open lock device is performed.

FIG. 14 is a diagram illustrating a state in which the cable is kinked.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 5 Cable 6 Spherical stopper 10 Operation lever 11 Bracket 12 Shaft 13 Return spring 14 Engagement part 20 Locking device

Claims (2)

[Claims] 1. A door hook provided on a door of a cab, a locking device disposed on an outer wall of the cab and locking the door hook when the door is opened, and locking between the door hook and the locking device. A driver's cab door open lock device having an operating lever to be released, wherein the operating lever (10) is a cable.
(5) to the locking device (20) and the operating lever
A door open lock device for a driver's cab, comprising an engaging portion (14) between the (10) and the cable (5) for engaging only in the pulling direction of the cable (5). 2. The driver's cab door open lock device according to claim 1, wherein said engaging portion is provided with said operating lever.
0), which is formed in an open hemispherical or concave shape, and wherein the engaging portion (14) and the spherical tip of the cable (5) are engaged with each other. Door open lock device.