JP2513695Y2 - Cab down prevention device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab lowering prevention device for preventing a cab from inadvertently lowering in a cab-over type automobile, and more particularly to a cab tilting device for lifting a cab by a cylinder device and tilting the cab. It relates to a suitable one to be attached.

[0002]

2. Description of the Related Art Generally, in a cab-over type automobile, maintenance and inspection work of an engine portion can be easily performed by lifting and tilting the cab.

In such a case, a cylinder device is provided between the cab and the vehicle body (frame), and the expansion / contraction operation of the cylinder device allows the cavitating operation to be performed around the pivot point of the front lower part of the cab. A configured cavitating device may be used.

In such a cavitating apparatus,
A cab lowering prevention device is provided in order to avoid a risk of accidental accident caused by the cab being lowered above the operator's head when a failure occurs in the cylinder device.

As such a cab lowering prevention device,
It is known to be configured as shown in FIG. A stay 51 is rotatably attached to the tip of a piston rod 50 which is reciprocally inserted into the cylinder device and pivotally attached to the cab. A base end portion of the stay 51 is formed in a channel shape, and a plurality of pairs of stopper teeth 52 are formed on both end sides of the opening.
The base end of the stay 51 is attached to the outer circumference of the cylinder tube 53 of the cylinder device. A channel-shaped stay guide 54 is attached to the outer periphery of the cylinder tube 53 so as to cover the overlapping portion of the stay 51 and the cylinder tube 53. Further, a lever stopper 56 having a claw 55 capable of engaging with the teeth 52 of the stay 51 is rotatably fixed to the outer periphery of the cylinder tube 53.

The pawl 55 of the lever stopper 56 is engaged with the teeth 52 of the stay 51 to support the weight of the cab by the stay 51, thereby preventing the piston rod 50 from being shortened by the weight of the cab. Is configured.

[0007]

However, in such a cab lowering prevention device, when the weight of the cab acts on the stay 51, the lever stopper 56 causes the pin 57 to move.
6, a rotation moment is generated in the counterclockwise direction in FIG.
Since a rotational moment is generated in the clockwise direction about the pivot point with respect to 0, a force acts on the stay 51 in the direction away from the axial center of the cylinder tube 53 in proportion to the magnitude of the load acting on the stay 51. Stay 51, stay guide 5
4, the buckling strength between the cylinder tube 53 and the piston rod 50, and consequently the buckling strength of the cylinder device, is reduced.

An object of the present invention is to provide a cab lowering preventive device capable of preventing a decrease in buckling strength due to a load acting on a stay.

[0009]

Means for Solving the Problems] cab lowering prevention device according to the present invention, the cab (11) and cab is tilted by the cylinder device (13) which is interposed between the frame (12) (11) A cab lowering prevention device (10) for preventing accidental lowering , the cylinder device
(13) The cylinder device is rotatably pivotally attached to a tip end portion of a piston rod pivotally attached to the cab (11) , and an end portion on a piston rod side is formed in a channel shape.
(13) and the stay, which is affixed to a substantially half of the cylinder tube outer periphery of the plurality of teeth that are arrayed in the axial direction of the scan tape, before Symbol stay and the cylinder tube Te outside smell of the cylinder tube a polymerization unit with the stay outer peripheral surface covers the stay guide which is fixed to the cylinder tube disposed are in such contact, rotatably supported one end by a pin to said cylinder tube wherein the self Yoshitan portion Lever stopper with pawls that can be engaged with stay teeth
In though Ruki catcher Bed lowering prevention device comprises a preparative, the stearate
-A pair of stoppers on both sides of the outer periphery of the opening of (16)
(17) and (17) are respectively provided so as to project along the axial direction.
And the stay in each stopper (17)
The tooth (18) is provided on the end surface opposite to the opening of (16).
The lever stoppers (25) are arranged in rows, respectively.
The pin (24) of the stay and the front of the stay (16)
With the axis of the cylinder tube (15) (CL) in between
The lever stopper is installed on the opposite side.
The claw (26) of (25) is the same as that of the stopper portion (17).
To the teeth (18) from the side opposite to the opening of the stay (16)
It is characterized in that it is configured to engage.

[0010]

According to the above-described means, when the pawl of the lever stopper is engaged with the teeth of the stay and the load of the cab acts on the stay, a rotational moment is generated in the stay in the direction approaching the cylinder tube. On the other hand, the lever stopper generates a rotational moment inward in the radial direction of the cylinder tube about the pin . The pawl of the lever stopper is pressed toward the teeth of the stay by the rotation moment of the lever stopper. Thus, stays, because the stay guide cylinder tube, a piston rod arranged in a straight line, the buckling strength between them, are not shed so that the decrease in buckling strength of the cylinder device can be prevented.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an enlarged perspective view of an essential part of a cab lowering prevention apparatus according to an embodiment of the present invention, FIG. 2 is a side view showing the entire structure, and FIG. FIG. 4 is a cross-sectional view, FIG. 4 is a perspective view showing a stay, and FIG. 5 is a schematic side view showing a cavitating device to which the present invention is applied.

In this embodiment, a cab lowering prevention device 1
0 is attached to the cavitating apparatus shown in FIG. 5 and includes a stay 16. In the cylinder device 13 provided between the cab 11 and the frame 12,
A tip end of a stay 16 is pivotally attached to a tip end of a piston rod 14 attached to the cab 11 side. Stay 1
6 is made of a metal material having rigidity and is formed in an elongated semi-cylindrical shape. The stay 16 extends to the cab side end (hereinafter, referred to as a tip end) of the cylinder tube 15 in the cylinder device 13, and is attached to a substantially semicircular side of the outer circumference of the cylinder tube 15. A pair of stopper portions 17, 17 are integrally provided on both side surfaces of the stay 16 on the outer peripheral side of the opening so as to integrally project. This stopper portion 17
Are arranged along the axial direction of the stay 16, and on the surface of the outer peripheral surfaces of both the stopper portions 17 and 17 opposite to the opening of the stay 16, the stopper portions 17 and 17 are a pair of stoppers. A plurality of sets of teeth 18 for use are formed at substantially equal intervals in the length direction. And stay 1
The central portion of the opening of 6 is formed in a substantially semicircular shape so as to be in close contact with the outer peripheral surface of the cylinder tube 15. A flat slide surface 19 is formed on the surface of the stay 16 opposite to the opening.

A piston rod 14 is inserted into the cylinder tube 15 so as to reciprocate, and a support block 20 is welded to the tip of the cylinder tube 15 so as to straddle the opening of the stay 16. A cylinder tube 15 and a stay 1 are provided at the end of the support block 20 on the tip side.
A stay guide 21 is integrally formed to cover the overlapping portion with 6 and to contact the slide surface 19 and both side surfaces 17 of the stay 16 to guide the movement of the stay 16. That is,
The stay guide 21 is fixed to the cylinder tube 15 via the support block 20.

On the other hand, a pair of lever stopper support pieces 22 are integrally formed at the rear end of the support block 20 so as to face each other. A shaft hole 23 is formed in each of the support pieces 22 and 22, and a pin 24 is inserted into each shaft hole so that the pin 24 is provided between the support pieces 22 and 22. A lever stopper 25 is rotatably mounted on the pin 24. That is, the lever stopper 25 is rotatably supported by the cylinder tube 15 via the support block 20, the support piece 22, and the like. The free end portion of the lever stopper 25 on the front end side is provided with a pawl 2 which is engageable with the teeth 18 of the stay 16.
A pair of 6 is formed. Further, a spring (not shown) is stretched between the lever stopper 25 and the support block 20, and the elastic force of the spring acts as a force for pressing the pawl 26 toward the tooth 18. ing. That is, the lever stopper 25 rotates in the radial direction of the cylinder tube 15 with the pin 24 as a fulcrum, and the claw 26 causes the teeth 1 of the stay 16 to move.
8 is to be engaged. The engagement of the claw 26 and the tooth 18 causes the load of the cab 11 to stay 16
It is designed to prevent the piston rod 14 from shortening when it acts on.

The lever stopper 25 is manually or automatically released by a releasing means (not shown) such as an operating wire linked to the lever stopper 25. After this release, the piston rod 14 is expanded and contracted by the rotation of the cylinder device 13.

Next, the operation will be described. Lever stopper 25
When the cylinder device 13 is extended in a state where the claws 26 and the teeth 18 of the stay 16 are released from each other, the extension operation of the piston rod 14 causes the pivot point 2 of the cab 11 to move.
A tilt operation centered on 8 is performed. When the cab 11 reaches the specified upper limit position, due to the urging force of the spring,
When the lever stopper 25 is rotated clockwise in FIGS. 1 and 2, the pawl 26 engages with the teeth 18 of the stay 16, so that the piston rod 14 is shortened by the load W of the cab 11. It is prevented by the stay 16 and the lever stopper 25.

When the load W of the cab is applied to the stay 16 by the engagement between the claw 26 and the teeth 18 of the stay 16, the lever stopper 25 starts to rotate clockwise around the pin 24 as a fulcrum, but at the same time, the lever The stopper claw 26 has teeth 18
Since the tooth bottom is pressed, the stay 16 starts rotating counterclockwise. Then, the semi-cylindrical inner surface portion of the tip portion of the stay 16 closes a gap with the tip outer peripheral portion of the cylinder tube 15 and abuts against this, and then the cylinder tube 1
5 is pressed. Therefore, the piston rod 14,
The connection between the support block 20 and the cylinder tube 15 is strengthened, the buckling strength is enhanced, and the safety of the cab lowering prevention device 10 is further improved.

That is, the lever stopper 25 acts so as to apply the pressing force F to the stay 16 with the contact point between the tip of the claw 26 and the tooth 18 of the stay 16 as the action point 27. The pressing force F increases in proportion to the load W of the cab 11. Therefore, the stay 16 is pressed against the outer peripheral surface of the cylinder tube 15 according to the rotation moment M generated by the lever stopper 25. This state is as close as possible to the point where the contact action point 27 between the claw 26 and the tooth 18 is the closest point within the range where the axial center line CL of the cylinder tube 15 does not exceed the slide surface 19 side. Therefore, the buckling strength between the stay 16, the piston rod 14, and the cylinder tube 15 is improved. As a result, the buckling strength of the cylinder device 13 is improved.

The above description of the operation has been made for the case where the claw 26 meshes with the tooth 18 located at the most distal end of the stay 16 on the cylinder tube 15 side. In this case, the chill of the cab is used.
The angle is the largest. However, when it is desired to set the tilt angle in the middle for various reasons, the claw 26 may be engaged with the subsequent tooth 18 on the cab side, and the operation is the same as that described above.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention.

For example, the stay guide and the lever stopper are not limited to being provided on the support block, but may be independently provided on the cylinder tube.

[0022]

As described above, according to the present invention,
When the cab load acts on the stay, the stay is pressed against the outer peripheral surface of the cylinder tube by the rotational moment acting on the lever stopper, and the point of action between the lever stopper and the stay is the axis of the cylinder tube. Since the load is applied in a state close to the core, it is possible to prevent the buckling strength of the cab lowering prevention device and the cylinder device from being lowered due to the load acting on the stay.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of a main part of a cab lowering prevention device according to an embodiment of the present invention.

FIG. 2 is a side view showing the overall configuration.

3 is an enlarged cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a perspective view showing a stay.

FIG. 5 is a schematic side view showing a cavitating apparatus to which the present invention is applied.

FIG. 6 is a perspective view showing a conventional example.

[Explanation of symbols]

10 ... Cab lowering prevention device, 11 ... Cab, 12 ... Frame, 13 ... Cylinder device, 14 ... Piston rod, 1
5 ... Cylinder tube, 16 ... Stay, 17 ... Stopper part, 18 ... Tooth, 19 ... Sliding surface, 20 ... Support block, 21 ... Stay guide, 22 ... Lever stopper support piece, 23 ... Shaft hole, 24 ... Pin, 25 … Lever stopper,
26 ... nails, 27 ... points of action.

Claims (1)

(57) [Scope of utility model registration request] 1. A cab lowering prevention device (10 ) for preventing a cab (11) tilted by a cylinder device (13) interposed between a cab (11) and a frame (12) from being accidentally lowered. ) comprising forming on the cab (11) pivots at the distal end of the pivotally mounted piston rod freely pivotally mounted to <br/> piston rod side end channel shape of the cylinder unit (13) a stay that is affixed to a substantially half of the cylinder tube outer periphery of the cylinder device (13) is a plurality of teeth that are arrayed in the axial direction of the scan tape, the outside of the cylinder tube <br/> a stay guide which is fixed to the cylinder tube is arranged to contact the pre-Symbol stay and the stay peripheral surface covers the overlapping portion of the cylinder tube Te odor, one end by a pin to said cylinder tube Contact to movably supported has been optionally Ruki catcher Bed lowering prevention device and a lever stopper which teeth engageable claws of the stay to the self Yoshitan portion is formed
The stay (16) has a pair of spaces on both sides of the outer circumference of the opening.
Toppers (17) and (17) are respectively arranged along the axial direction.
It is projecting and can be attached to each stopper (17).
The end of the stay (16) opposite the opening is
(18) are arranged in rows, and the pin (24) of the lever stopper (25) is
The opening of the stay (16) and the cylinder tube (1
It is arranged on the opposite side across the axis (CL) of 5).
Together with the claw (2) of the lever stopper (25)
6) attaches to the teeth (18) of the stopper portion (17) by the
-Constructed to engage from the side opposite the opening of (16)
A cab lowering prevention device characterized by being provided.