JPH0645426Y2 - Cab lock alarm device - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention relates to a cab lock alarm device, and more specifically, a cab lock alarm for alerting a driver of forgetting to apply a cab lock mechanism of a tilt cab vehicle. It relates to the device.

<Prior art> In tilt-cab automobiles, the cab is mounted on the chassis so that it can be tilted in order to improve the maintainability of the engine etc.
At the time of maintenance, the cab is tilted up and upward with the center of the tilt (hinge pin) as the center. Further, normally, the cab is lowered to the normal position and the cab side is engaged and fixed (locked) to the chassis side by the cab lock mechanism.

In a cab-over automobile equipped with such a cab lock mechanism, if the cab is used for traveling without the cab lock, the cab may be tilted up due to traveling vibration or the like. Therefore, in the past, for example,
As can be seen in 50-13288 or Japanese Utility Model Laid-Open No. 61-64090, a switch for detecting the position of the main hook that engages with the eyebolt or the lock lever that operates the main hook is provided. Was working properly to detect whether the cab was securely locked in its normal position.

<Problems to be solved by the invention> However, in the cab lock mechanism, even when the cab is tilted, the main hook or the lock lever may move to the lock position due to external vibration or the like. . Therefore, in the case where the operating state of the cab lock mechanism is judged based on the position of the main hook or the lock lever as in the above-mentioned conventional example, the main hook or the lock lever moves to the lock position due to external vibration or the like. If so, there is a possibility that the main hook may be erroneously recognized as a locked state even when the main hook is not engaged with the eyebolt.

The present invention has been made in view of the above problems, and provides a cab lock alarm device capable of accurately detecting and notifying whether or not a main hook is securely engaged with an eyebolt. Is intended.

<Means for Solving Problems> In order to achieve the above object, the present invention provides a spring for downwardly urging an eyebolt attached to a chassis, and a pivot end of a cab tiltably mounted on the chassis. A main hook, which is hung and held rotatably up and down and rotatably via a main latch at a lower portion, and operating means for swinging the main latch are provided, and the swinging operation of the main latch is performed by the operating means. In a cab lock mechanism in which a main hook engaged with an eyebolt is moved upward against a spring to hold and hold a cab untilt, an operating piece facing a contact body provided on the eyebolt from below. After attaching the switch having the switch to the chassis, the alarm device is connected to the switch. Then, a rubber spring and a coil spring are arranged in series between the lower end of the shaft portion for mounting the eyebolt on the chassis so as to be able to move up and down, and the eyebolt is urged downward, and the maximum compression amount of the coil spring is increased. The feature is that a stopper for regulating is provided.

<Operation> When the cab lock is released, the main hook is disengaged from the eyebolt, so the eyebolt is held down by the urging force of the rubber spring and the coil spring. However, when the main hook is engaged with the eyebolt and the cab is securely locked, the main hook lifts the eyebolt against both springs by the pulling action of the main latch.

Also, when the main hook moves to the lock position under the influence of external vibration while the cab is tilted up, that is, the main hook is held at the engagement position with the eyebolt. Even when the eyebolt is not moved upward, since the eyebolt is elastically held in the lowered position by the urging force of the rubber spring and the coil spring, the state of the cab lock and the position of the eyebolt correspond exactly.

When the eyebolt moves up and down in this way, the contact body provided on the eyebolt moves up and down to move the operating piece of the switch up and down, so that the state of the cab lock and the state of the switch change accurately in correspondence with each other. As a result, the operating state of the alarm device changes based on this. Therefore, it is possible to accurately ascertain from the operating state of the alarm device whether or not the cabling is surely performed, and it is possible to accurately prevent a defect caused by forgetting to apply the lock.

Further, a rubber spring and a coil spring are arranged in series to urge the eyebolt downward, and a stopper is provided to regulate the maximum compression amount of the coil spring. For this reason, deformation of the coil spring gives a large play stroke to the eyebolt to prevent erroneous operation of the switch, while deformation of the rubber spring ensures a tightening margin by the main hook to ensure sufficient engagement force between the main hook and the eyebolt. Since the size can be increased, it is possible to prevent the main hook from coming off due to traveling vibration or the like.

<Embodiment> An embodiment of the present invention will be described in detail below with reference to the drawings.

In the figure, a cab 1 is mounted on a front end of a frame 2 on the chassis side so as to be tiltable around a tilt center 3. The tilt operation is facilitated by providing a tilt device such as a torsion bar or a hydraulic cylinder.

The cab 1 through a cab mounting (not shown)
A rear arch 4 that supports the rotating end (rear end) of the above is spanned between a pair of frames 2. Then, the main hook 6 of the cab lock mechanism 5 provided on the rear surface of the cab 1 is engaged with an eyebolt 7 that is vertically movable at the center of the rear arch 4, so that the rear end of the cab 1 is moved to the rear arch 4.
It is designed so that it can be engaged and fixed.

A main latch 9 pivotally attached to the cab 1 via a pin 8 so as to be swingable left and right is attached to the main hook 6 via a pin 11.
When a cab lock lever (not shown) provided as an operating means is pivotally operated, the main latch 9 oscillates in the left-right direction in FIG. The hook 6 moves up and down while moving left and right in the figure so as to be engaged with and disengaged from the eyebolt 7.

On the other hand, a shaft portion 12 is provided below the eyebolt 7 so as to vertically pass through the rear arch 4. A rubber spring 14 and a coil spring 15 are provided between the nut 13 screwed to the lower end of the shaft portion 12 and the lower surface of the rear arch 4.
These springs 14,1
The urging force of 5 urges the eyebolt 7 downward. Therefore, when the main hook 6 is not engaged with the eyebolt 7, the eyebolt 7 is pulled down and held at the lower end position shown in FIG. 3 by the urging force of the rubber spring 14 and the coil spring 15.

However, when the main hook 6 is engaged with the eyebolt 7 and is moved upward by the main latch 9, the coil spring 15 is first compressed and deformed. Then, after the stopper 17 for controlling the maximum compression amount of the coil spring 15 is seated on the lower surface of the rubber spring 14 as shown in FIGS. 1 and 2, the rubber spring 14 is deformed by compression. . Therefore, the hook 6 and the eyebolt 7
The engaging force of (1) coincides with the sum of the reaction forces of both springs 14 and 15 and a cab mounting (not shown). 16 is eyebolt 7
This is a dust cover that prevents foreign matter from being caught by the vertical movement of the.

A switch 19 is attached to the rear arch 4 via a stay 18, and an operating piece 20 of the switch 19 is projected upward. Then, the contact body 22, which is mounted on the side surface of the eyebolt 7 via a stay 21 so as to be able to move up and down, is opposed to the operating piece 20 of the switch 19 from above, and the contact body 22 is downwardly biased by a spring 23. I am letting you.

In such a configuration, the eyebolt 7 does not move the main hook 6 upward when the cab 1 is tilted or when the cab is lowered to the normal position but not locked. Therefore, in this state, the contact body 22 attached to the eyebolt 7 contacts the operation piece 20 of the switch 19 and pushes it down as shown in FIG. 3, so that the switch 19 is closed.

Further, when the eyebolt 7 is not pulled up even though the main hook 6 is rotated to the lock position, the tension of the coil spring 15 holds the eyebolt 7 at the lower end position.

Therefore, in such a released state, the contact body 22 provided on the eyebolt 7 keeps pressing the operating piece 20, and the switch 19 is closed. Therefore, even if the cab lock lever is operated to the lock position, the main hook 6
When is not securely engaged with the eyebolt 7, an alarm means provided in the driver's cab activates an alarm, thereby warning that the cab lock device is not properly locked.

On the other hand, when the cab 1 is lowered and the cab lock lever is moved to the lock position, the rod 10 moves in the direction of arrow a in FIG. 1 and swings the main latch 9 in the direction of arrow b in FIG. The main hook 6 suspended and held by the main latch 9 engages with the eyebolt 7.

When the rod 10 is further moved in the a direction in this state by the cab lock lever, the main latch 9 is further rotated, so that the main hook 6 engaged with the eyebolt 7 is moved upward to resist the coil spring 15. And pull up the eyebolt 7. Then, the contact body 22 provided on the eyebolt 7 rises together with the eyebolt 7, and a gap is eventually created between the operating piece 20 of the switch 19 and the contact body 22.
19 opens the circuit to stop the alarm operation of the alarm means.

In this state of the cab lock, the coil spring 15 is compressed to the maximum position, and the urging force of the rubber spring 14 is directly transmitted to the nut 13 via the stopper 17. Therefore, even if the pulling force acting on the eyebolt 7 (the tightening force of the cab with respect to the rear arch 4) is sufficiently large, the coil spring 15 is not compressed and deformed more than necessary, and the main hook 6 comes off. Is also prevented.

Further, when the cab 1 is displaced relative to the frame 2 due to traveling vibration or the like, the contact body 22 causes the operating piece of the switch 19 to move.
There is concern that it will hit 20. However, the deformation of the coil spring 15 gives a large play stroke to the eyebolt 7 to operate the switch 19, while the elastic deformation of the rubber spring 14 ensures the tightening margin by the main hook 7. Therefore, although the cab lift amount due to traveling vibration can be made smaller than the play stroke of the eyebolt 7 to prevent erroneous operation of the switch 19, a large elastic force (urging force) by the rubber spring 14 causes the main hook 6 and the eyebolt 6 to slam. Since the engaging force of 7 can be made sufficiently large, the main hook 6 is prevented from coming off. In the embodiment, by lowering the spring constant of the spring 23 for urging the contact body 22 downwardly than the spring constant of the spring provided inside the switch 19, the operating piece 20 of the switch 19 is
The impact applied to is reduced.

<Effect of the Invention> As is apparent from the above description, according to the present invention, the eyebolt is configured to be pulled up against the spring only when the cab lock mechanism is reliably operated, and the lock is performed based on the position of the eyebolt. I try to judge whether or not. Therefore, even if the cab lock lever or the main hook is moved to the lock position, respectively, if the main hook is securely engaged with the eyebolt and is not pulled up to the lock position, the alarm is activated to activate the cab lock. In order to notify the user that the lock has not been released, there is no chance of inconvenience caused by forgetting to lock.

Further, a rubber spring and a coil spring are arranged in series to urge the eyebolt downward and a stopper is provided for restricting the maximum compression amount of the coil spring. Therefore, although the play stroke of the eyebolt secured by the deformation of the coil spring can prevent the malfunction of the switch, the deformation of the rubber spring secures the tightening margin by the main hook and the engagement force between the main hook and the eyebolt. Since it can be made sufficiently large, it is possible to prevent the main hook from coming off due to traveling vibration or the like.

[Brief description of drawings]

FIG. 1 is a front view of a working state of a cab lock mechanism showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a front view of the same non-operating state, and FIG. 1 is a schematic side view showing an example of an automobile to which the present invention is applied. In the figure, 1 is a cab, 2 is a chassis (frame), 3 is a tilt center, 4 is a rear arch, 5 is a cab lock mechanism, 6
Is a main hook, 7 is an eyebolt, 8 is a pin, 9 is a main latch, 10 is a rod, 11 is a pin, 12 is a shaft part, 13 is a nut, 14 is a rubber spring, 15 is a coil spring, 16
Is a dust cover, 17 is a stopper, 18 is a stay, 19 is a switch, 20 is an operating piece, 21 is a stay, 22 is a contact body, and 23 is a spring.

Claims (1)

[Scope of utility model registration request] 1. A spring for urging and lowering an eyebolt attached to a chassis so as to be able to move up and down, and a cab which is tiltably mounted on the chassis. A main hook and an operating means for swinging the main latch. By swinging the main latch by the operating means, the main hook engaged with the eyebolt moves upward against a spring. In the cab lock mechanism in which the cab is engaged and held in a non-tiltable manner, a switch having an operating piece that opposes the abutment body provided on the eyebolt from below is attached to the chassis, and an alarm device is connected to the switch. At the same time, attach a rubber spring and a coil spring between the chassis and the lower end of the shaft that attaches the eyebolt to the chassis. With lowering urging the eyebolt by disposing the ring in series, cab warning device, characterized in that a stopper for restricting the maximum amount of compression of said coil spring.