JP3966699B2 - Cab locking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cab locking device used in a truck, and more particularly to a locking device that limits the amount of cab movement forward due to a load acting in front of a vehicle.
[0002]
[Prior art]
For trucks with a cab that can be tilted around the bottom of the front end, the rear end of the cab and the chassis can be detachably connected via a lock mechanism, and the lock mechanism can be released as necessary. The cab can be tilted up.
[0003]
However, in such a locking device, since the cab and the chassis are not fixed, when a large forward load represented by, for example, a seat belt load acts on the cab, the load is locked to the tilt hinge. In order to concentrate on the mechanism, there is a concern that the tilt hinge or the lock mechanism or the mounting portion thereof may be deformed.
[0004]
Therefore, in the prior art, as seen in Japanese Utility Model Publication No. 62-125682, for example, by providing a cab hook on the cab side facing the chassis hook provided on the chassis side with play from the rear in the operating state of the locking mechanism, Only when the load is increased, the cab hook is engaged with the chassis hook to disperse the load, thereby limiting the maximum amount of forward movement of the cab and avoiding deformation of the tilt hinge or lock mechanism, etc. It was like that.
[0005]
However, in such a conventional example, since the cab hook is tightened and fixed to the cab side with a bolt, it is necessary to insert the tightening bolt with the cab hook positioned on the floor frame of the cab, for example. There was a problem of poor workability.
[0006]
[Problems to be solved by the invention]
This invention is made | formed in view of the said situation, Comprising: It makes it the subject to improve the assembly | attachment workability | operativity of the latching device by a chassis hook and a cab hook.
[0007]
[Means for Solving the Problems]
The present invention for solving the above-tiltably mounted cab rear end and through the locking mechanism and the chassis side members linked to allow disengagement of the chassis around the front end lower portion, the cab floor The lower end engaging portion of the cab hook formed in a U shape when viewed from the front holding the frame is opposed to the chassis hook attached to the chassis side with play from the rear in the operating state of the lock mechanism, and is fixed to the cab side. An engagement groove that engages with the pin from above is provided at the upper end of the cab hook. Then, by fixing the cab hook to the cab side with a bolt arranged behind the pin, the engagement portion of the cab hook is moved to the chassis hook only when the amount of forward movement of the cab exceeds the range of play. To limit the maximum amount of forward movement of the cab .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of an essential part showing an embodiment of a cab locking device according to the present invention, and FIG.
[0009]
In these drawings, the rear end of the cab 1 and the rear arch 2 fixed to the chassis are detachably coupled to each other via a lock mechanism (not shown) while being tiltably mounted on a chassis (not shown) around the lower portion of the front end of the cab 1. Thus, a tilt cab type track is configured.
[0010]
Further, a cab hook 5 that is inclined rearward and lower is attached to the rear end of the floor frame 4 along the front-rear direction along the lower surface of the floor panel 3 of the cab 1. The cab hook 5 is formed in a U shape so as to hold the floor frame 4 when viewed from the front as shown in FIG. 2, and an engagement groove 5 a that opens downward is provided at the upper end of the cab hook 5. ing.
[0011]
Then, after engaging the engaging groove 5a from above with the pin 6 fixed on both sides of the rear portion of the floor frame 4 and temporarily holding the cab hook 5 on the cab side, the cab hook 5 is moved backward with the pin 6 as the center. And the cab hook 5 is provided with a bolt 7 disposed behind the pin 6 in a state where the engaging portion 5b provided at the lower end of the cab hook 5 is opposed to the chassis hook 8 with play from behind. The hook 5 is fastened and fixed to the floor frame 4. 9 is a rear mount and 10 is a back panel.
[0012]
In the cab locking device having the above-described configuration, when the locking mechanism (not shown) is operated, the engaging portion 5b of the cab hook 5 is opposed to the chassis hook 8 with play from behind, so that the cab hook 5 The chassis hook 8 does not interfere, and the cab 1 can be tilted up by releasing the lock mechanism.
[0013]
Further, when the cab hook 5 is attached to the floor frame 4, the engagement groove 5 a of the cab hook 5 is engaged with the pin 6 from above, and the floor frame is interposed via the pin 6 as shown by a two-dot chain line in FIG. The cab hook 5 is suspended and temporarily placed at the rear part. Subsequently, the cab hook 5 is rotated in the counterclockwise direction in the figure around the pin 6, and when the bolt holes coincide with each other, the bolt 7 is inserted and the cab hook 5 is fastened and fixed to the floor frame 4. The engaging portion 5b provided at the lower end of the cab hook 5 is opposed to the chassis hook 8 with play from behind.
[0014]
When tightening the bolt 7, the cab hook 5 tends to rotate around the bolt 7 due to the frictional force between the bolt 7. However, the pin 6 does not rotate around and engages with the cab hook 5 with respect to this rotation, so that the cab hook 5 does not rotate as the bolt 7 is tightened.
[0015]
That is, conventionally, the cab hook 5 is aligned with the floor frame 4 and the bolts 7 are inserted and fastened and fixed, so that the assembling workability is poor. However, when the cab hook 5 is temporarily placed and held on the floor frame 4 using the pin 7 as in the present embodiment, the position of the bolt hole only by rotating the cab hook 5 around the pin 6. The cab hook 5 can be easily assembled and the cab hook 5 can be prevented from rotating as the bolt 7 is tightened, so that the workability of the cab hook 5 is improved.
[0016]
On the other hand, when a large load is applied to the cab 1, the cab 1 tends to move to the left side in FIG. When the amount of movement at that time exceeds the play amount between the cab hook 5 and the chassis hook 8, the engaging portion 5b of the cab hook 5 engages with the chassis hook 8 and bears a part of the forward load. The load applied to the cab hinge or the lock mechanism (not shown) is reduced, and the tilt hinge or the lock mechanism or the mounting portion thereof is prevented from being deformed.
[0017]
Further, the load reaction force applied to the cab hook 5 and the rotational force due to this load reaction force are distributed and borne as a shear force on the pins 6 and the bolts 7. Therefore, until the pin 5 or the bolt 7 is cut by the shearing force, the mounting posture of the cab hook 5 with respect to the floor frame 4 does not change carelessly, and the function of restricting the maximum movement amount of the cab 1 forward is provided. It is kept stable.
[0018]
In the above-described embodiment, the cab hook 5 having a U-shape when viewed from the front so as to hold the floor frame 4 of the cab and the chassis hook 8 formed in a key shape are used, but the shape of the chassis hook 8 is the same as that of the embodiment. It is not limited to things.
[0019]
【The invention's effect】
As is apparent from the above description, the present invention uses a cab hook formed in a front U shape so as to hold the floor frame of the cab, so that the strength of the cab hook and its support stability are excellent, Reliability as a locking device is increased. In addition, the pin can be used to temporarily place the cab hook and tighten and fix it with bolts, and the pin used for temporary placement can prevent the rotation of the cab hook, which is a concern during bolt tightening and load application. This can improve the workability of assembling the cab hook.
[Brief description of the drawings]
FIG. 1 is a side view of essential parts showing an embodiment of a cab locking device according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cab 2 Rear arch 3 Floor panel 4 Floor frame 5 Cab hook 5a Engaging groove 5b Engaging part 6 Pin 7 Bolt 8 Chassis hook 9 Rear mount 10 Back panel

Claims (1)

The rear end portion of the cab (1) mounted so as to be tiltable on the chassis centering on the lower portion of the front end and the chassis side member are detachably coupled via a lock mechanism, and the floor frame (4) of the cab (1) is attached. The lower end engaging portion (5b) of the cab hook (5) formed in a U-shape as viewed from the front is opposed to the chassis hook (8) attached to the chassis side with play from the rear in the operating state of the lock mechanism. On the other hand, an engagement groove (5a) that engages with the pin (6) fixed on the cab (1) side from above is provided at the upper end of the cab hook (5), and the bolt ( 7) By tightening and fixing the cab hook (5) to the cab (1) side in step 7), the cab hook (5) is engaged only when the forward movement amount of the cab (1) exceeds the play range. Join the joint (5b) to the chassis hook ( ) To be engaged cab locking device being characterized in that so as to limit the maximum amount of movement in the front of the cab (1).

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