JPH0664562A - Cab tilting tilt stopper device - Google Patents

Abstract

PURPOSE:To enable a worker to operate lock mechanism within a hand action range in the stand-up state. CONSTITUTION:Link mechanism to be interposed between a frame 21 and a cab lower member 23 with its front end part pivotally fixed to each front lateral part of the frame 21 through a tilting shaft 22 so as to hold the cab lower member 23 to a specified tilt angle is formed by fixing an upper-lower link 27 pivotally in the bendable state to the cab lower member 23 and the frame 21 through an upper bracket 28 and a lower bracket 29. An upper link 30 is provided with lock mechanism formed of a locking arm 36 extended from the pivotally fixed part so as to be rotatable along the upper bracket 28 and pierced with a lock hole 37 in a specified radial position from the pivotally fixed part, and a lock pin 43 engaged in the state of protruding/receding to/from the upper bracket 28 side on the turning locus of the lock hole 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilt stopper device for a cab tilt in a tilt cab vehicle.

[0002]

2. Description of the Related Art Conventionally, in a tilt cab vehicle 1 of this type, as shown in FIG. 15, a cab tilt torsion stopper device 7 for holding a cab 5 in a tilted up state is provided by a cab tilt torsion bar device (not shown). It is provided. The tilt stopper device 7 is provided on one of the cab floor members 6 that supports the cab 5, one end of which is pivotally mounted via the tilt shaft 4 to the left and right cab hinge brackets 3 arranged near the front end of the frame 2 as illustrated. It is arranged between a predetermined position and a predetermined position of the frame 2, and one end of an upper link 9 of a predetermined length is rotatably supported by the cab floor member 6 via an upper bracket 8. One end of a lower link 11 is rotatably supported by the frame 2 via a lower bracket 10. Both links 9 and 11 are flexibly connected by a shaft pin 12, and both links 9 and 11 are extended near the pin attachment portion. A lock mechanism 13 for fixing is provided to form a tilt stopper device 7 for the cavit.

[0003]

However, in the conventional tilt stopper device 7, as shown in FIGS. 16 and 17, the tilt stopper is locked by the vehicle 1.
In this case, since the lock mechanism 13 is provided in the vicinity of the pin attachment portions of both links 9 and 11, in particular in a small frame vehicle, the ground height H of the lock mechanism 13 is as shown in the figure. Since the position becomes lower and the position is farther than the hand operating range in which the illustrated operator stands up, there is a problem that an unnatural posture is forced.

The present invention has been made in order to solve the above-mentioned conventional problems, and provides a tilt stopper device for a cavittist capable of operating a lock mechanism within the hand operation range of an operator while standing upright. The purpose is.

[0005]

SUMMARY OF THE INVENTION In order to solve the above technical problems, the present invention interposes between a frame and a cabroller member whose front end is pivotally attached to the front left and right of the frame via tilt shafts. A tilt stopper device for a cab tilt for holding the cab floor member at a predetermined tilt angle, wherein upper and lower links are pivotally movably attached to each other and pivotally attached to the cab blower member and the frame via the upper bracket and the lower bracket. A lock arm that forms a link mechanism, is extended from the pivotal portion of the upper link, is rotatable along the upper bracket, and has a lock hole penetrating from the pivotal portion to a predetermined radial position. A cabling cotch member having a lock mechanism composed of a lock pin engageably retractable on the upper bracket side on the rotation path of the lock hole. Resides in Tosutoppa apparatus.

[0006]

With the above-mentioned structure, the lock mechanism can be safely and easily unlocked because the lock mechanism can be positioned at the ground height position within the hand operating range while the operator is standing upright. it can.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to FIGS.
According to the explanation, the left and right cab floor members 2
Although not shown, 3 is pivotally attached to the tilt shaft 22 via cab hinge brackets on the left and right front portions of the frame 21, and the cab floor member 23 has a horizontal portion 24 on which the cab 5 can be placed and the horizontal portion 24. A bent portion 25 that bends at a predetermined angle is integrally formed on the rear side. Between the frame 21 and the cab floor member 23 thus provided, a tilt stopper device (hereinafter, referred to as a tilt stopper device) 26 for cabult is interposed.

The tilt stopper mechanism 26 is composed of a link mechanism 27 and a lock mechanism 35. The link mechanism 27 corresponds to the upper bracket 28 attached to the bent side end of the bent portion 25 of the horizontal portion 24 of the cab floor member 23 and the frame 2 corresponding to the upper bracket 28 when the cab floor member 23 is tilted down.
An upper link 3 having a predetermined length which is paired with a lower bracket 29 mounted on one side and which is vertically paired.
0 and the lower link 31, one end of each of the upper and lower links 30 and 31 has a bracket 28,
The link 29 is pivotally mounted to the shaft 29 by means of shaft pins 32 and 33, and the links 30 and 31 are pivotally connected to each other by a shaft pin 34 so that the links 30 and 31 can be extended by a cavitating torsion bar device (not shown). And the length of the cab floor member 23 that tilts up to, for example, about 45 degrees. In addition, the lock mechanism 3 has a predetermined length from the pivotally connected portion of the upper link 30 by the shaft pin 32.
The lock arm 36 that constitutes 5 is integrally formed to extend.

The lock arm 36 is composed of a lock bracket 38 and a lock mechanism 35, which are mounted on the bent portion 25 side at a predetermined distance from the upper bracket 28. The lock arm 36 is formed into a substantially fan shape. A lock hole 37 is formed at a predetermined radius r from the center of the shaft pin 32 near the lower edge of the lock arm 36.

The lock bracket 38 has a bent portion 25 of the cab floor member 23 as shown in FIGS.
A mounting web 39 and a support member 40 having a substantially bowl-shaped cross section are fixed to each other by welding means, and the mounting web 39 has a lock hole 37 at a radius r centered on the shaft pin 32. A lock pin hole 41 is provided at a predetermined position on the rotation locus, and a lock pin 43 is inserted into the support member 40 via a coil spring 42 having a predetermined spring pressure. The lock pin 43 is urged toward the outside of the lock pin hole 41. Further, a handle 44 is integrally attached to one end of the lock pin 43 in a T shape.

In the lock mechanism 35 thus formed, when the cab floor member 23 is tilted down, the lock pin 43 and the lock arm 36 are located on the side opposite to the lock hole 37 of the lock arm 36 as shown in FIG. Four
The pin 43 is pushed into the support member 40 side by abutting against the tip of the pin 3. In this state, the bent portion 25 of the lock hole 37
Has a distance L1. Then, when the cab floor member 23 is tilted up, the upper and lower links 30, 3 are
1 shifts from the bent state to the extended state, and the upper link 30
When the lock arm 36 is rotated counterclockwise about the shaft pin 32, the lock arm 36 is rotated along the lock bracket 38 and the lock hole 37 reaches the lock pin 43, the lock pin 43 is coiled. The cab floor member 23 is held at a tilt angle of approximately 45 degrees by being automatically engaged with the lock hole 37 by the urging force of the spring 42. In this state, the gap L2 between the lock position of the lock hole 37 and the lock pin 43 and the bent portion 25 is smaller than the tilt-down gap L1, and the upper link 30 is locked by the two points of the shaft pin 32 and the lock pin 43. It is in a broken state.

When tilting down from this tilt-up state, if the handle 44 of the lock mechanism 35 is grasped and pulled against the coil spring 42, the lock hole 37 of the lock pin 43 is pulled.
When the engagement with is released, the upper and lower links 30, 31 can be bent and can be tilted down.

As described above, the tilt stopper device 26 of this embodiment includes the cab blower member 23 whose front end is pivotally attached to the left and right of the front portion of the frame 21 via the tilt shaft 22 and the frame 21.
And a cab floor member 23 for holding the cab floor member 23 at a predetermined tilt angle, for example, 45 degrees. The upper and lower links 30 and 31 are pivotally attached by a shaft pin 32 so that they can be bent and extended. A link mechanism 27 pivotally attached to the cab floor member 23 and the frame 21 via a lower bracket 29 and a lower bracket 29 is formed, and a lock bracket 38 adjacent to the upper bracket 28 extends from the shaft pin 32 of the upper link 30. The lock arm 36 is rotatable along the lock pin 37 and has a lock hole 37 penetrating at a position of a predetermined radius r from the shaft pin 32. The lock mechanism 35 including the matching lock pin 43 is provided. Therefore, as shown in FIGS. 5 and 6, the lock mechanism 35 is located on the side of the upper bracket 28 of the link mechanism 27, so that the ground height Ha becomes high and the work is erected in the tilted-up state, as is apparent from the figure. Since the lock mechanism 35 is located at the position Ta close to the human hand operation range, the lock mechanism 35 can be unlocked and tilted down safely without causing an unnatural posture. As described above, according to the tilt stopper device 26 of this embodiment, the tilt-up lock is automatically performed at the time of tilt-up, and the lock pin 43 can be easily released at the time of tilt-down by pulling the lock pin 43 in an upright posture. The safety can be secured.

Next, a second embodiment of the present invention will be described with reference to FIGS. 7 to 12. In the second embodiment, a tilt stopper device 75 for cavitts using a torsion bar device 56 for cavitts is shown. , The left and right cab floor members 53a and 53b are the frame 5
Although not shown, the front and left front portions of the vehicle 1 are pivotally attached to the tilt shaft 52 via cab hinge brackets. The cab floor member 53 has a horizontal portion 54 on which the cab 5 can be placed and a rear side of the horizontal portion 54. A bent portion 55 that bends at a predetermined angle is integrally formed. Between the frame 51 and the cab floor members 53a and 53b provided in this way, a torsion bar device for cavitating (hereinafter referred to as a torsion bar device) 56 is interposed.

As shown in FIG. 7, the torsion bar device 56 includes left and right link arm mechanisms 57A and 57B and a pair of torsion bars 64 and 65 provided between the left and right link arm mechanisms 57A and 57B and the tilt operating link 7.
It is composed of 0 and. The right link arm mechanism 57B shown in the drawing is an upper link arm 58a having a predetermined length.
The lower link arm 58b and the lower link arm 58b are pivotally attached by a shaft pin 59a, a washer, a split pin, etc. (see FIG. 9), and the other end of the upper link arm 58a is pivotally attached by a shaft pin 59b to the right upper bracket 60a. Of the cab floor member 53b of the horizontal portion 54 on the bent portion 55 side, that is, near the center of gravity (not shown) of the cab 5, and the lower link arm 58b is attached to the right lower bracket 60b.
Is pivotally attached to the frame 51 via a shaft pin 59c and is attached to the frame 51 side in correspondence with the right upper bracket 60a.

Further, in the left link arm mechanism 57A, similarly to the right link arm mechanism 57B, an upper link arm 61a and a lower link arm 61b having a predetermined length are pivotally attached by a shaft pin 59a, and other parts of the upper link arm 61a. The end is pivotally attached to the left upper bracket 62 via a shaft pin 59b, and is attached to the horizontal portion 54 of the left cab floor member 53a at a position near the center of gravity of the cab 5 corresponding to the right upper bracket 60a. Lower link arm 61b
Is attached to the left lower bracket 63 via the shaft pin 59c on the frame 51 side in correspondence with the left upper bracket 62. The upper and lower right brackets 60a and 60b and the left lower bracket 63 are formed in a substantially U-shaped cross section as shown in FIG. 10, and have shaft pins 59b and 59c, which are washers, split pins, and the like, link arms 58a and 58b.
61b is pivotally attached. A pair of torsion bars 64 and 65 are horizontally mounted between the left and right link arm mechanisms 57A and 57B thus interposed.

The torsion bar 64 is provided between the upper link arms 58a and 61a, and the other torsion bar 6 is provided.
5 is attached between the lower link arms 58b and 61b, and the right end portions of the torsion bars 64 and 65 are directly fixed by welding means at predetermined positions from the shaft pins 59a of the upper and lower right link arms 58a and 58b. Or Fig. 11
As shown in FIG. 11, serration tubes 66A and 66B having serration holes 66a are attached at the same positions, and serration shafts 64a and 65a formed at the ends of the torsion bars 64 and 65 are fitted and fixed. Further, as shown in FIG. 12, serration shafts 64b and 65b are also formed at the other ends of the torsion bars 64 and 65, and the left link arm mechanism 57 is located on the serration shafts 64b and 65b side.
The upper and lower link arms 61a, 61b of A are penetrated through the insertion holes 67a, 67b at positions corresponding to the serration tubes 66A, 66B attached to the upper right lower link arms 58a, 58b, and the serration shaft 64b. , 65b are linked to the tilt operation link 70.

This tilt actuating link 70 is attached to the left link arm mechanism 57A side, and upper and lower links 71, 72 having a predetermined length are mutually linked as shown in FIGS. 7 and 12. Is pivotally connected by a shaft pin 59d, and serration tubes 66C and 66D similar to the serration tube 66A are fixed to the other ends of the links 71 and 72 by welding means, and end portions of the serration tubes 66C and 66D. Is the insertion hole 67
a and 67b are rotatably inserted and each serration hole 6
The serration shafts 64b and 65b are fitted and fixed to the 6a.

In the torsion bar device 56 constructed as described above, when the cab 5 is tilted up from the tilt down state, the right link arm mechanism 57 of the torsion bar 64 is formed.
On the B side, the counterclockwise torque T1 shown in the figure is applied to the upper right link arm 58a, and the torsion bar 65 is clockwise torque T shown in the figure to the lower right link arm 58b.
2 is given, so that both link arms 58a, 58
Forces in opposite directions are applied to the coupling portions 59a of b to cancel each other out, but the forces exerted on the upper and lower brackets 60a and 60b at the other ends of the link arms 58a and 58b become tilt acting forces. Further, on the left link arm mechanism 57A side, the torsion bar 64 is the upper link 7 of the tilt operation link 70.
1, a torque T3 clockwise in the drawing is given, and a torsion bar 65 gives a torque T4 counterclockwise in the drawing to the lower link 72, so that the vertical links 71, 72
A force in the opposite direction is applied to the shaft pin 59c of the connecting portion of the above, and the torques T3 and T4 of the torsion bars 65 and 65 are offset by the force to try to open and expand the upper and lower links 71 and 72. Link arms 61a, 61
Instead of the force for opening the upper bracket 62 and the lower bracket 63 on the shaft pin 59b of the connecting portion of b, the force acts as a tilting force. The left link arm mechanism 57A side of the torsion bar device 56 thus provided also serves as a tilt stopper device (hereinafter, tilt stopper device) 75 for the cavitt.

The tilt stopper device 75 is the upper left lower link arms 61a and 61b of the left link arm mechanism 57A.
Corresponds to the upper link 30 and the lower link 31 in the first embodiment, and the left upper bracket 62 is formed by integrally forming the upper bracket 28 and the lock bracket 38 in the first embodiment. Will be described.

The upper link arm 61a has a left upper bracket 62a as shown in FIG. 8 similarly to the first embodiment.
A lock arm 77 forming a lock mechanism 76 is formed so as to extend from the shaft pin 59b of the above with a predetermined length, and this lock arm 77 is also formed from the center of the shaft pin 59b formed in a substantially fan shape as in the first embodiment. Lock hole 7 at a predetermined radius r '
8 are pierced. Further, the left upper bracket 62 is formed in a flat plate shape, and the lock pin 80 is elastically attached to a predetermined position of the rotation locus of the lock hole 78 via the support member 79 as in the first embodiment. It can be locked and unlocked.

In the torsion bar device 56 thus provided, the lock hole 78 and the lock pin 80 are engaged with each other at an angle position of about 45 degrees as the torsion bar 64, 65 is tilted up by the acting force of the torque. Then, the tilt-up is locked. Therefore, also in the second embodiment, since the lock mechanism 76 is provided on the left footer bracket 62 of the left link arm mechanism 57A, the lock mechanism 76 is grounded in the tilt-up locked state as in the first embodiment. Since the height Ha becomes high and the lock mechanism 76 is located at the position Ta close to the hand movement range of the worker who has stood upright, the lock mechanism 76 can be unlocked without an unnatural posture. It is possible to safely tilt down, the same effect as that of the first embodiment is achieved, and in the case of the second embodiment, since the left link arm mechanism 57A is also used as the tilt stopper link, the conventional torsion bar is used. It is possible to eliminate the link mechanism of the tilt stopper device that was installed in parallel with the device and reduce the vehicle weight and cost. .

Although the lock arms 36 and 77 are integrally formed with the upper link 30 and the upper left link arm 61a in each of the above embodiments, the present invention is not limited to this, and for example, FIG. 13 and FIG. As shown in FIG. 14, a lock arm 81 is formed separately from the upper link 30 and the upper left link arm 61a,
By changing the position of the lock hole 82 with respect to the position P of the lock pin so as to be applied to a tilt angle, for example, 45 degrees, 35 degrees, etc., depending on the vehicle type, and fixing with the welding means W, more than one part can be obtained. It is possible to correspond to the tilt angle of.

[0024]

As described above, according to the present invention, since the lock mechanism is located on the upper bracket side of the link mechanism because of the above-described configuration, the worker who stands up with the ground height increased in the tilt-up locked state. Since the lock mechanism is located in the hand operation range, it does not have an unnatural posture, the lock mechanism can be unlocked, and tilt down can be performed safely. Further, when the tilt-up is performed, the tilt-up is automatically locked, and when the tilt-down is performed, the lock pin can be easily released by pulling the lock pin in a standing posture, and the safety can be secured. Further, by using this lock mechanism together with the link arm mechanism of the cavitating torsion bar device, the link mechanism of the conventional tilt stopper device can be eliminated and the weight and cost of the vehicle can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a tilt stopper device for cabult.

FIG. 2 is an enlarged view of a lock mechanism.

FIG. 3 is a cross-sectional view showing engagement between a lock pin of a lock mechanism and a lock arm during tilt-up lock.

FIG. 4 is a sectional view of a state in which a lock pin and a lock arm of the lock mechanism are tilted down.

FIG. 5 is a side view showing the relationship between the ground height position of the lock mechanism and the operator's hand operation range at the time of cabling up lock.

FIG. 6 is a rear view showing the relationship between the ground height position of the lock mechanism and the operator's hand operation range when the cab lock-up lock is used.

FIG. 7 is a perspective view in which a lock mechanism is attached to a torsion bar device for a cavitt.

FIG. 8 is an enlarged view of an upper bracket to which a lock mechanism is also attached.

FIG. 9 is a cross-sectional view of a pivotally connecting portion of left and right link arm mechanisms.

FIG. 10 is a sectional view showing pivotal attachment of a bracket and a link arm.

FIG. 11 is a cross-sectional view showing fitting of a torsion bar and a torsion tube.

FIG. 12 is a cross-sectional view showing the relationship between the left link arm mechanism, the tilt operation link, and the torsion bar.

FIG. 13 is a front view showing the attachment at a tilt angle of 45 degrees when the lock arm is provided separately.

FIG. 14 is a front view showing the attachment at a tilt angle of 35 degrees when the lock arm is provided separately.

FIG. 15 is a perspective view in which a tilt-up lock is performed by a conventional tilt stopper device for a cavitt.

FIG. 16 is a side view showing the relationship between the ground height position of the lock mechanism and the operator's hand operation range at the time of the conventional cab lock-up lock.

FIG. 17 is a rear view showing the relationship between the ground height position of the lock mechanism and the operator's hand operation range at the time of the conventional cab lock-up lock.

[Explanation of symbols]

 21, 51 Frame 22, 52 Tilt shaft 23, 53 Cab floor member 26 Tilt stopper device for cab tilt 27 Link mechanism 28 Upper bracket 29 Lower bracket 30 Upper link 31 Lower link 35 Lock mechanism 36 Lock arm 37 Lock hole 38 Lock bracket 43 Lock Pin 56 Cab torsion torsion bar device 57A Left link arm mechanism 61a Left upper link arm 61b Left lower link arm 62 Left upper bracket 64,65 Torsion bar 70 Tilt actuating link 76 Lock mechanism 77,81 Lock arm 78,82 Lock hole 80 Lock pin

Claims (1)

[Claims] 1. A tilt for a cavitt which holds the cab floor member at a predetermined tilt angle by being interposed between a cab blower member whose front end is pivotally attached to the front left and right sides of a frame via a tilt shaft and a frame. A stopper device,
A link mechanism is formed to pivotally connect the upper and lower links so as to be bendable and extendable, and to pivotally connect to the cabroller member and the frame via the upper bracket and the lower bracket, and the upper link is extended from the pivoting portion to form the upper bracket. A lock arm that is rotatable along the lock arm and that extends through the lock hole at a predetermined radial position from the pivot portion, and a lock arm that is retractably engaged with the upper bracket side on the rotation trajectory of the lock hole. A tilt stopper device for a cavit, which is configured to have a lock mechanism including a pin.