JPH11115827A - Cab-tilt stopper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the setting work and safety of a stopper member used in a cab-tilt stopper device for a cab-over vehicle by setting the stopper member automatically in place. SOLUTION: A safety rod is integrally coupled to a cab-side support 20 and a frame-side support 21. When a cab 10 is tilted up, this safety rod, which is normally pressed down, is raised correspondingly to support the cab 10. This support mechanism dispenses with a removal of a safety rod from its storage place and its setting work into a predetermined position at every cab tilt to thereby save trouble in such a cab tilt or improve the safety in such setting of the safety rod.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab tilt stopper device for a cab-over vehicle, and more particularly, to an automatic technique for setting a stopper member.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 9, a cab tilt stopper device for a cab-over vehicle employs a safety rod 3 serving as a stopper member for supporting a cab 2 tilted up by a tilt cylinder device 1 when the cab tilts up. Is interposed between the cab member 4 and the frame 5 in an upright state.

When the safety rod 3 is not used, as shown in FIG. 9, the safety rod 3 is stored in a place away from the cab body such as the rear cab mount bracket 6, and is removed by the operator after the cab tilt-up is completed. , Cab member 4
It is adapted to be fixed to the supports 7 and 8 on the side of the frame 5 and the frame 5 (see Japanese Utility Model Laid-Open No. 4-109690 and Technical Publication No. 94-18708).

[0004]

However, in the above-described conventional safety rod mounting operation, it is necessary to remove the safety rod from the storage unit and set it at a predetermined position each time. Since the safety rod is long, the safety at the time of attachment and detachment is inferior. In view of the above problems, the present invention aims to improve workability and safety by automating the operation of setting a stopper member in a cab tilt stopper device of a cab-over vehicle. And

[0005]

According to a first aspect of the present invention, a cab that is raised and lowered by a cylinder device and selectively positioned at a fixed position on a frame side and an upper position that is tilted up is tilted up. A safety rod as a stopper member for supporting the tilted-up cab, a cab-side support for supporting the safety rod on the cab side, and supporting the safety rod on the frame side. Frame side support,
A lock device for locking the safety rod in a state of supporting the tilted-up cab, wherein the cab-side support is fixedly attached to a side surface of a cab member, and a support shaft fixedly attached to a lower portion thereof. The upper end of the safety rod is rotatably supported at the tip of the frame. The frame-side support is fixedly attached to the upper surface of the frame and extends in the direction in which the frame extends. And a short side portion extending diagonally forward and upward and having a lower end portion opened. A narrow groove extending along a long side portion is formed on an outer wall portion of the short side portion, and a safety rod is movably inserted inside the narrow groove. At the same time, a hinge pin protruding from the side surface of the lower end of the safety rod is inserted through and supported by the narrow groove. When the cab is tilted, the hinge pin moves along the narrow groove, so that the lower end of the safety rod is elongated. On the side Between slides moved and the long side portion inside position and the short side portion inside position is slid, characterized in that it is selectively moved to the state in which got up a state in which the safety bar is bowed down I.

According to a second aspect of the present invention, the lock device comprises a cylinder device that locks the lower end of the safety rod in a state where the cab is tilted up and locks the safety rod in the above state. A locking portion for pressing and locking the lower end of the safety rod is provided at the tip end of the piston rod of the cylinder device, and when the piston rod is extended, the locking portion is moved from the lower surface opening of the short side to the short piece. The safety rod is inserted into the portion to press and lock the lower end of the safety rod.

According to a third aspect of the present invention, there is provided a cab fixed position detecting switch for detecting that the cab is located at a normal fixed position, a tilt switch for detecting completion of tilting up of the cab, and a safety rod locking device. A lock switch for activating a tilt pump that detects a lock and an unlock by the tilt pump and supplies hydraulic pressure for operating a cab tilt cylinder device, an operation switch of the tilt pump, and an operating pressure of the cylinder device. A control switch for a solenoid that drives an operating pressure control valve device for switching and controlling a direction, a warning buzzer, and control means for controlling the solenoid control switch, the warning buzzer, and the tilt pump based on a detection signal from each of the switches. And is characterized by including.

According to a fourth aspect of the present invention, the control means for the solenoid control switch controls the solenoid control switch based on signals from the pump operation switch, the tilt switch, and the lock switch. Is determined to be ON, the lock device is in the lock operation state, and the lock switch is determined to be OFF, and the lock device is in the lock release operation state, even though the lock device is not operated. When it is determined, a failure determination control for determining that a failure has occurred in the lock device is performed.

According to a fifth aspect of the present invention, the warning buzzer control means controls the warning buzzer based on signals from the home position detection switch and the tilt switch. A control for activating a warning buzzer when a failure of the device is determined is performed.

According to a sixth aspect of the present invention, the tilt pump control means controls the tilt pump on the basis of signals from the pump operation switch and the tilt switch. When the failure is determined, control for operating the tilt pump is performed.

The operation of the present invention will be described. Claim 1
In the invention according to the first aspect, the cab is lifted by the cylinder device, and is located at an upper position tilted up from a fixed position on the frame side. On the other hand, when the cab is tilted up, the hinge pin moves along the narrow groove, so that the lower end of the safety rod slides along the long side and slides from the inside of the long side to the inside of the short side. Then, the safety rod in the folded state is raised, and the upper end of the safety rod is held by the cab-side support, and the lower end is held by the short side of the frame-side support.

[0012] In the invention according to claim 2, the locking device locks the safety rod by pressing the lower end portion of the safety rod in a state where the cab tilt-up state is held by the locking portion. In the invention according to claim 3, the solenoid control switch, the warning buzzer, and the tilt pump are respectively controlled based on detection signals from the cab fixed position detection switch, the tilt switch, the lock switch, and the pump operation switch.

In the invention according to claim 4, the solenoid control switch is controlled based on signals from a pump operation switch, a tilt switch and a lock switch, and the lock switch is operated even though the lock device is not operated. When the state of the lock device is changed from ON to OFF, it is determined that the lock device has failed. In the invention according to claim 5, the warning buzzer is controlled based on signals from the home position detection switch and the tilt switch, and is activated during cab tilt and when a failure of the lock device is determined.

In the invention according to claim 6, the tilt pump is controlled based on signals from a pump operation switch, a lock switch, and a tilt switch, and is activated at the time of cab tilt and when a failure of the lock device is determined. Is done.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 4, a cab 10 includes a tilt cylinder device 1 interposed between a cab member 11 on the cab 10 side and a frame 12.
3, it is moved up and down as indicated by the arrow in FIG. 1, and is selectively positioned at the fixed position on the frame 12 side and the tilted up position.

The drive of the tilt cylinder device 13 is controlled by the supply and stop of the hydraulic pressure by the tilt pump device 14. The tilt pump device 14 includes a tilt pump 15, a tilt pump switch 16 for turning on / off the tilt pump 15, and a hydraulic pressure switch (up / down) switch 17 for the tilt pump 15.

Further, a cab fixed position detecting switch 18 for detecting that the cab 10 is located at a normal fixed position (tilt down state) is provided at a position facing the lower surface of the rear end of the cab 10. I have. Here, the cab tilt stopper device includes a safety rod 19 as a stopper member for supporting the cab 10 tilted up, and the safety rod 19.
A cab-side support 20 for supporting the cab 10 side, a frame-side support 21 for supporting the safety rod 19 on the frame 12 side, a hinge pin 22 for swinging and sliding the safety rod 19, a tilt switch 23 for detecting the end of tilt, A hydraulic lock cylinder device 24 as a lock device for locking the safety rod 19, a lock switch 25 for detecting lock and unlock of the safety rod 19 and enabling the tilt pump 15 to operate; A solenoid-operated hydraulic control valve device 26 for switching and controlling the hydraulic pressure direction, and a solenoid control switch 2 for controlling the solenoid of the valve device 26
7, a warning buzzer 28, a solenoid control switch 27, a warning buzzer 28, and a control unit 29 for controlling the tilt pump 15 respectively.

Such a configuration will be described in detail in order. The cab-side support 20 is formed to have a substantially U-shaped cross section, and one end thereof is fixed to a lower surface of a substantially L-shaped bracket 30 fixedly attached to a side surface of the cab member 11. A support shaft 20A is fixedly attached to a lower portion of the cab-side support 20, and an upper end portion of a safety rod 19 is rotatably supported at a tip end of the support shaft 20A.

In this case, the cab-side support 20 is formed in such a size that the upper end of the safety rod 19 is stored inside the cab-side support 20. The frame side support 21 is
A long side portion 21A fixedly attached to the upper surface of the frame 12 and extending in the direction in which the frame 12 extends, and a short side portion 21B extending obliquely forward and upward from the tip of the long side portion 21A, are formed in a substantially U-shaped cross section. Is done. The lower end of the short side 21B is open.

On both wall portions of the frame-side support 21, narrow grooves 21a extending along the long sides 21A are formed. The distal end side of the narrow groove 21a extends slightly upward. The lower end of the safety rod 19 is movably inserted into the inside of the frame-side support 21, and the hinge pins 22 protruding from both sides of the lower end of the safety rod 19 are inserted and supported in the narrow grooves 21a. Is done.

Therefore, when the hinge pin 22 moves along the narrow groove 21a, the lower end of the safety rod 19 slides from the position inside the short side 21B to the position inside the long side 21A and moves along the long side 21A. It is designed to be slid. With the above configuration, at the time of tilting the cab, the safety rod 19 lying down before tilting rises, the upper end of the safety rod 19 is stored inside the cab-side support 20, and the lower end of the safety rod 19 is the short-side of the frame-side support 21. The state is stored inside the side part 21B.

The tilt switch 23 detects the end of the tilt, as described above, and is disposed in the vicinity of the lower end side surface of the safety rod 19 raised when the cab tilts up as described above. The state in which the safety rod 19 is raised, that is, the end of the tilt, is detected by the contact of the lower end of the 19. A warning buzzer 28 that operates during cab tilt is provided.
When the tilt switch 23 detects that the cab tilt has ended, the operation of the warning buzzer 28 is stopped.

The hydraulic lock cylinder device 24 includes a safety rod 19 in a state where the cab tilt state is maintained, that is,
When the safety rod 19 is raised and the upper end of the safety rod 19 is stored inside the cab-side support 20 and the lower end is stored inside the short side 21B of the frame-side support 21, Lock the lower end of the safety rod 1
9 is locked in the above state, and is disposed below the short side portion 21B of the frame-side support 21.

At the tip of the piston rod 24A of the hydraulic lock cylinder device 24, a locking portion 24B for pressing and locking the lower end of the safety rod 19 is provided. 24B is short side 21
B is inserted into the short piece 21B from the open portion on the lower surface, and presses and locks the lower end of the safety rod 19. The lock switch 25 is a hydraulic lock cylinder device 24.
The piston rod 24A is disposed in the vicinity of the piston rod 24A. When the piston rod 24A is contracted when the safety rod lock state is released by the hydraulic lock cylinder device 24, the locking portion 24B at the distal end of the piston rod 24A is When the operating piece 24a provided integrally is brought into contact, that is, when the unlocking of the safety rod 19 is detected, the tilt pump 15 is made operable.
Further, the lock switch 25 detects the lock of the safety rod 19 in a state where the operating piece 24a does not abut.

The hydraulic control valve device 26 comprises a two-port, three-position switching valve device driven by solenoids 26A and 26B, and is connected to a hydraulic pump 31 and an oil receiving portion 32. The hydraulic pressure is supplied to the chamber A of the hydraulic lock cylinder device 24, the safety rod lock position where the hydraulic pressure in the chamber B returns to the oil receiving portion 32, and the hydraulic pressure from the pump 31 is supplied to the chamber B. A safety rod unlocking position returning to the receiving portion 32, and a neutral position holding the oil pressure in the A room or the B room to cut the oil pressure supply and the oil pressure return to hold the locked state and the unlocked state, respectively. Solenoid control switch 2
7 can be switched.

Next, the schematic operation of this configuration will be described. The solenoid control switch 27 is normally switched to the neutral position, and the lock state of the hydraulic lock cylinder device 24 is maintained. When the solenoid control switch 27 is switched to the unlocked side, the hydraulic pressure from the hydraulic pump 31 is supplied to the chamber B of the hydraulic lock cylinder device 24, the piston rod 24A is contracted, and the locked state is released. As a result, the locking portion 24B presses the lock switch 25, and the switch is turned off. This switch 25 is
In the FF state, the tilt pump 15 becomes operable.

Here, when the tilt pump switch 16 is pressed and turned on, the tilt pump 15 is operated, the tilt cylinder device 13 is extended, and the cab 10 is tilted. At this time, the warning buzzer 28 is operated.
By the tilt-up operation of the cab 10, the safety pin 19 is moved by the hinge pin 22 moving along the narrow groove 21a while the upper end of the safety rod 19 rotates around the support shaft 20A as described above. The lower end of the safety rod 19 is slid along the long side 21A, and is slid to the position inside the short side 21B.
When the user gets up from the prone position, the upper end of the safety rod 19 is stored inside the cab-side support 20, and the lower end is stored inside the short side 21 </ b> B of the frame-side support 21.

When the cab tilt-up operation is completed, the tilt switch 23 is pushed by the safety rod 19 to be turned ON, and the operation of the warning buzzer 28 is stopped. The operator releases the tilt pump switch 16 based on the notification of the completion of the cab tilt-up, turns it off, and stops the operation of the tilt pump 15.

Next, the solenoid control switch 2
When the lock 7 is switched to the lock side, the hydraulic pressure from the hydraulic pump is supplied to the chamber A of the hydraulic lock cylinder device 24,
The piston rod 24A is extended to lock the safety rod 19. Thereafter, when the solenoid control switch 27 is switched to the neutral side, the hydraulic lock cylinder device 24 is held in a locked state, and the safety rod 19 is held in a locked state.

Next, control contents of the solenoid control switch 27, the alarm buzzer 28 and the tilt pump 15 by the control unit 29 will be described with reference to the flowcharts of FIGS. First, FIGS. 5 and 6
The control content of the solenoid control switch 27 will be described based on the following.

The solenoid control switch 27
Is controlled based on the ON / OFF states of the switches 16, 23 and 25. In the initial state of step 1 (abbreviated as S1 in the figure, the same applies hereinafter), switches (hereinafter, referred to as SW in the flowchart) 16, 23, and 25 are all OFF, and the solenoid control switch 2
7 is turned off. The flag is initialized to 0.

In step 2, switches 16 and 25 are set to O
It is determined whether the FF and the switch 23 are ON,
If so, go to step 3; otherwise, go to step 4. In step 3, the solenoid control switch 27 is turned on to switch the hydraulic lock cylinder device 24 to the lock operation, and the process returns to step 2.

In step 4, it is determined whether or not the switches 16, 23 and 25 are ON. If so, the process proceeds to step 5, and if not, the process proceeds to step 6.
In step 5, the solenoid control switch 27
Is turned on, the hydraulic lock cylinder device 24 is switched to the lock release operation, and the routine proceeds to step 7. In this step 7, the switches 16 and 23 are ON and the switch 25
Is determined to be OFF. If not, the process returns to step 4; if so, the process proceeds to step 8.

In step 8, the solenoid control switch 27 is turned off to bring the hydraulic lock cylinder device 24 into a neutral state, and then the process returns to step 7. On the other hand, in step 6, the solenoid control switch 27 is turned off to bring the hydraulic lock cylinder device 24 into the neutral state, and the routine proceeds to step 9. In step 9, it is determined whether or not the switches 16 and 23 are ON and the switch 25 is OFF. If so, the process proceeds to step 10, in which the solenoid control switch 27 is turned on, and the hydraulic lock cylinder device is turned on. Is switched to the lock operation, and the process returns to step 9.

In step 9, switches 16 and 2
If 3 is ON and the switch 25 is not OFF, the process proceeds to step 11. In step 11, the switch 16 is turned off.
In F, it is determined whether or not the switches 23 and 25 are ON. If not, the process proceeds to step 12, and if so, the flag is set to 1 in step 13;
Proceed to step 12.

In step 12, switches 16 and 25
Is OFF, and if not, the flag is set to 0 in step 14 and the process returns to step 2. If so, go to step 15. In this step 15, it is determined whether or not the flag is 1;
If the flag is not 1, the process returns to step 2.

If the flag is 1, the routine proceeds to step 16, where it is determined that the hydraulic lock cylinder device 24 is abnormal, and the solenoid control switch 27 is turned off.
Then, the process proceeds to a step 17, wherein the flag is set to 2.
That is, in step 11, the switch 25 is determined to be ON, and the hydraulic lock cylinder device 24 is in the lock operation state, and although the hydraulic lock cylinder device 24 is not operated, the control proceeds to step 12. If it is determined that the switch 25 is OFF and the hydraulic lock cylinder device 24 is in the unlocking operation state, it is determined that the hydraulic lock cylinder device 24 has failed, and At 16, it is determined that the hydraulic lock cylinder device 24 is abnormal, and the solenoid control switch 27 is turned off.
Set the flag to 2.

This flag = 2 is for determining a failure, and this is related to the control of the warning buzzer 28 and the tilt pump 15 shown in the flowcharts of FIGS. Next, the control content of the warning buzzer 28 will be described with reference to FIG. Note that the warning buzzer 28 is
Control is performed based on the ON / OFF states of 3 and 18.

In step 21, it is determined whether or not the flag set in the flowcharts of FIGS. 5 and 6 is 2, and if the flag is 2, the flow proceeds to step 22 and the warning buzzer 28 is turned on. Thereafter, the process proceeds to step 23, where it is determined whether the switch 18 is ON. If the switch 18 is not ON, the process returns to step 22 and the warning buzzer 28 is kept ON.

If the switch 18 is ON, step 2
After turning off the warning buzzer 28 in step 4, the system is reset and stopped in step 25. On the other hand, if the flag is not 2 in step 21, the process proceeds to step 26, where it is determined whether the switches 23 and 18 are OFF, and if so, the warning buzzer 28
Is turned on, otherwise, the warning buzzer 28 is turned off in step 28, and the process returns to step 21.

In this flowchart, if it is determined in step 21 that the flag for determining the failure of the hydraulic lock cylinder device 24 is 2, the warning buzzer 28 is turned on in step 22 and Notify abnormalities,
The warning buzzer 28 is kept ON until it is determined in step 23 that the cab 10 is located at the home position. Next, control contents of the tilt pump 15 will be described with reference to FIG.

The tilt pump 15 is connected to the switch 1
6. Control is performed based on the ON / OFF states of the lock switches 25 and 18. In step 31, it is determined whether or not the flag set in the flowcharts of FIGS. 5 and 6 is 2, and if the flag is 2, step 32
After the tilt pump 15 is operated, the process proceeds to step 33, where the switch 16 is turned off and the switch 18 is turned on.
It is determined whether or not N.

If not, the flow returns to step 32 to keep the tilt pump 15 ON. Switch 16 is OF
F. If the switch 18 is ON, the tilt pump 15 is stopped in step 34, and then the system is reset and stopped in step 35. On the other hand, if the flag is not 2 in step 31, the process proceeds to step 36, where it is determined whether or not the switch 16 is ON. If so, the process proceeds to step 37;
Proceeding to 9, the tilt pump 15 is stopped.

In step 37, it is determined whether or not the lock switch 25 is off. If the lock switch 25 is off, the tilt pump 15 is operated in step 38; otherwise, the tilt pump 15 is turned on in step 39. Stop,
It returns to step 31 respectively. In this flowchart, in step 31, the hydraulic lock cylinder device 2
If it is determined that the flag is 2, which is the failure determination of No. 4, the tilt pump 15 is operated in step 32 to lower the cab 10, and in step 33, the cab 10 is set to the home position. The cab 10 continues to descend until it is determined that the cab 10 has been located.

The following Table 1 supplementarily explains the control contents of the solenoid control switch 27, the alarm buzzer 28 and the tilt pump 15 according to the above-mentioned flow chart. FIG. 7 is a table showing operation change states of the tilt pump hydraulic pressure changeover switch 17, the tilt pump switch 23, the lock switch 25, the cab fixed position detection switch 18, the solenoid control switch 27, the alarm buzzer 28, the tilt pump 15, and the lock cylinder device 24. .

[0046]

[Table 1]

The following Table 2 is a table for supplementary explanation of the above-described control at the time of the failure of the lock cylinder device 24 during the continuation of the tilt. The tilt pump switch for the tilt operation states of 5, 51 to 56 is shown in FIG. 16, tilt pump oil pressure changeover switch 17, tilt pump switch 23,
Lock switch 25, cab fixed position detection switch 18,
Solenoid control switch 27, alarm buzzer 2
8 is a table showing operation change states of the tilt pump 15 and the lock cylinder device 24.

[0048]

[Table 2]

According to the cab tilt stopper device having such a structure, the safety rod 19 is connected between the cab-side support 20 and the frame-side support 21 to be integrated, and the safety rod 19 is in a protruded state when the cab is tilted up. Is raised and the cab 10 is supported, so that it is not necessary to remove the safety rod from the storage part and set it at a predetermined position each time, so that the work is not troublesome and the safety related to the setting of the safety rod 19 is reduced. Performance can be improved.

In particular, according to the above embodiment, the safety rod 1
By providing the hydraulic lock cylinder device 24 that locks the cab 10 while supporting the cab 10 that has been tilted up, the safety rod 19 can reliably support the cab 10 and the hydraulic lock cylinder of the safety rod 19 A lock switch 25 for detecting locking and unlocking by the device 24 is provided. When the lock switch 25 is determined to be ON, the hydraulic lock cylinder device 24 is in a lock operation state, and the hydraulic lock cylinder device 24 is operated. Lock switch 25 is OFF even though it is not
When it is determined that the hydraulic lock cylinder device 24 is in the unlocking operation state, it is determined that the hydraulic lock cylinder device 24 has failed. , The warning buzzer 28 and the tilt pump 15 are controlled, so that the safety related to the lock structure of the safety rod 10 can be improved.

[0051]

As described above, according to the first aspect of the present invention, each time the safety rod is removed from the storage part,
The work of setting at a predetermined position is not required, and the work is not troublesome, and the safety related to the setting of the safety rod can be improved. According to the invention according to claim 2, the lock structure of the safety rod can be easily configured, and the lock can be reliably performed.

According to the third aspect of the invention, the solenoid control switch, the warning buzzer, and the tilt pump can be accurately controlled, and controllability can be improved. Claim 4-
According to the invention of the sixth aspect, the solenoid control switch, the warning buzzer, and the tilt pump can be accurately controlled,
Since the controllability is improved and the warning buzzer and the tilt pump are controlled based on the determination of the failure of the lock device, the safety related to the lock structure of the safety rod can be improved.

[Brief description of the drawings]

FIG. 1 is a side view illustrating an embodiment of a cab tilt stopper device according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is an enlarged view of a portion B in FIG.

FIG. 4 is a block diagram showing a configuration of a control unit according to the embodiment.

FIG. 5 is a flowchart illustrating control contents of a control unit in the embodiment.

FIG. 6 is a flowchart illustrating control contents of a control unit in the embodiment.

FIG. 7 is a flowchart illustrating control contents of a control unit in the embodiment.

FIG. 8 is a flowchart illustrating control contents of a control unit in the embodiment.

FIG. 9 is a side view illustrating an example of a conventional cab tilt stopper device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cab 11 Cab member 12 Frame 13 Tilt cylinder device 14 Tilt pump device 15 Tilt pump 16 Tilt pump switch 19 Safety rod 20 Cab side support 21 Frame side support 22 Hinge pin 24 Hydraulic lock cylinder device 25 Lock switch 26 Hydraulic control valve device 27 Solenoid control switch 28 Warning buzzer 29 Control unit

Claims (6)

[Claims] 1. A cab tilt stopper device for holding a cab, which is raised and lowered by a cylinder device and selectively positioned at a fixed position on a frame side and an upper position tilted up, in a tilt-up state, wherein the cab is tilted up. A safety rod as a stopper member for supporting the cab, a cab-side support for supporting the safety rod on the cab side, a frame-side support for supporting the safety rod on the frame side, and a cab in which the safety rod is tilted up. A locking device for locking in a supported state, wherein the cab-side support is fixedly attached to a side surface of a cab member, and an upper end portion of a safety rod is attached to a tip end of a support shaft fixedly attached to a lower portion thereof. The frame-side support is fixedly mounted on the upper surface of the frame and is supported in a direction in which the frame extends. A long side portion extending from the front end portion of the long side portion and a short side portion extending diagonally forward and upward and having a lower end portion opened, and a thin groove extending along the long side portion is formed on an outer wall portion thereof. The safety rod is formed movably inserted therein, and a hinge pin projecting from the lower end side surface of the safety rod is inserted through and supported by the narrow groove. When the cab is tilted, the hinge pin extends along the narrow groove. The lower end of the safety rod is slid along the long side and slid between the inside position of the long side and the inside position of the short side. A cab tilt stopper device which is selectively moved to the cab tilt stopper device. 2. The lock device comprises a cylinder device that locks a lower end portion of a safety rod in a state where a cab tilt-up state is maintained and locks the safety rod in the above state. At the distal end of the piston rod, a locking portion for pressing and locking the lower end portion of the safety rod is provided. When the piston rod is extended, the locking portion is inserted into the short piece from the lower surface opening of the short side, The cab tilt stopper device according to claim 1, wherein the lower end portion of the safety rod is configured to be pressed and locked. 3. A cab fixed position detection switch for detecting that the cab is at a normal fixed position, a tilt switch for detecting completion of tilt up of the cab, and locking and unlocking of the safety rod by a lock device. A lock switch for enabling a tilt pump for detecting and supplying hydraulic pressure for operating a cab tilt cylinder device, an operation switch for the tilt pump, and an operation for switching and controlling an operation pressure direction of the cylinder device. A control switch of a solenoid that drives the pressure control valve device; a warning buzzer; and control means for controlling the solenoid control switch, the warning buzzer, and the tilt pump based on a detection signal from each of the switches. The cab according to claim 1 or 2, wherein Tilt stopper device. 4. A control means for the solenoid control switch controls the solenoid control switch based on signals from the pump operation switch, the tilt switch and the lock switch. In the case where the lock device is in the lock operation state and the lock switch is determined to be OFF and the lock device is determined to be in the lock release operation state even though the lock device is not operated, 4. The cab tilt stopper device according to claim 3, wherein a failure determination control is performed for determining that a failure has occurred in the lock device. 5. The warning buzzer control means controls the warning buzzer based on signals from the home position detection switch and the tilt switch, and determines whether the cab tilt or the lock device has failed. 5. The cab tilt stopper device according to claim 3, wherein a control to activate a warning buzzer is performed when the warning is given. 6. The tilt pump control means controls the tilt pump based on signals from the pump operation switch, the lock switch, and the tilt switch. The cab tilt stopper device according to any one of claims 3 to 5, wherein when the determination is made, the tilt pump is controlled to operate.