JP2509808Y2 - Cab down prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a cab lowering prevention device for preventing a cab from inadvertently lowering in a cab-over-engine type automobile, and more particularly to lifting a cab by a cylinder device to cause a fall ( The present invention relates to a device suitable for being attached to a tilting device.

[Conventional technology]

Generally, in a cab-over type automobile, the cab is lifted and tilted so that maintenance and inspection work of the engine portion can be easily performed.

In such a case, since the cab is heavy and needs to be tilted beyond the load balance point, a cylinder device is provided between the cab and the vehicle body (frame), and the cab is expanded and contracted by the cylinder device. A cavitating device configured to perform the tilting operation of the may be used.

In such a cavitating device, a cab lowering preventive device is provided in order to avoid a risk of accidental accident caused by the cab descending above the operator's head when a failure occurs in the cylinder device. There is.

As such a cab lowering prevention device, one having a structure as shown in FIG. 5 is known. 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 stopper 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 engageable 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. Has been done.

[Problems to be solved by the device]

However, in such a cab lowering prevention device, when the weight of the cab acts on the stay 51, the lever stopper 56 generates a rotational moment in the counterclockwise direction in FIG. Causes a rotational moment in a clockwise direction around the pivot point of the piston rod 50, and therefore, the stay 51 receives a force in a direction away from the axis of the cylinder tube 53 in proportion to the magnitude of the load acting on the stay 51. Has a problem in that the buckling strength between the stay 51, the stopper guide 54, and the cylinder tube 53, and thus the buckling strength of the cylinder device, decreases.

An object of the present invention is to provide a cab lowering prevention device that can apply a force to a stay in a direction approaching the axis of the cylinder device in proportion to the load applied to the stay.

[Means for solving the problem]

A cab lowering prevention device according to the present invention is a cab lowering preventing device for preventing a cab tilted by a cylinder device interposed between a cab and a frame from being inadvertently lowered. At the tip of the piston rod pivotally attached to the cab, there is rotatably attached a stay having a plurality of teeth on the channel-shaped opening end side, and the end of the stay on the piston rod side is pivotally attached. Attached to the outer circumference of the cylinder tube of the cylinder device, a channel-shaped stopper guide is attached to the outer circumference of the cylinder tube so as to cover the overlapping portion of the stay and the cylinder tube. A lever stopper fixing portion is provided on a surface of the outer periphery opposite to the stay. In a cab lowering prevention device in which a lever stopper having a free end formed with a claw capable of engaging with the teeth of the stay is rotatably supported, the stay (of the outer circumference of the cylinder tube (16) 15), a stopper guide fixing portion (18) is projectingly provided at a position on the tip side of the lever stopper fixing portion (10) on the opposite side to the stopper stopper fixing portion (18). The tip end of the guide (22) is rotatably supported, and the stopper guide (22) is located at a position closer to the lever stopper fixing portion than the claw (27) of the lever stopper (26). A pressing portion (28) which can come into contact with the free end portion of the is protrudingly provided.

[Action]

According to the above-mentioned means, when the load of the cab acts on the stay, the lever stopper generates a rotational moment inward in the radial direction of the cylinder tube about the lever stopper fixing portion, and the lever stopper can press the free end portion. As a result, the stopper guide generates a rotational moment in the opposite direction about the stopper guide fixing portion.
Therefore, the claw of the lever stopper is pressed toward the teeth of the stay, and the cab side end of the stopper guide is pressed against the outer peripheral surface of the stay. As a result, the buckling strength between the stay, stopper guide, and cylinder tube,
Consequently, the buckling strength of the cylinder device can be improved.

〔Example〕

FIG. 1 is an enlarged perspective view of an essential part of a cab lowering prevention device according to an embodiment of the present invention, FIG. 2 is a side view showing the entire structure, and FIG. 3 is a cross section taken along line III-III in FIG. FIG. 4 is a schematic side view showing a cavitating device to which the present invention is applied.

In this embodiment, the cab lowering prevention device 10 is attached to the cab lint device shown in FIG. 4 and is provided with a stay 15. Stay 15 is cab 11 and frame 12
In the cylinder device 13 provided between the cab 11 and
The tip portion is pivotally attached to the tip portion of the piston rod 14 attached to the side. The stay 15 is made of a rigid metal material and is formed in an elongated channel shape. The stay 15 extends to the end of the cylinder device 13 on the cylinder tube 16 side and is slidably attached to the outer peripheral side of the cylinder tube 16. A plurality of pairs of stopper teeth 17 are formed on both end sides of the opening of the stay 15 and are arranged at substantially equal intervals in the length direction.

A piston rod 14 is inserted into the cylinder tube 16 so as to reciprocate, and an adapter 18 as a stopper guide fixing portion and a lever stopper fixing portion are provided on the tip end side of the cylinder tube 16 so as to straddle the opening of the stay 15. The bracket 19 as a part is welded separately from each other in the longitudinal direction. On the outer peripheral surface of the cylinder tube 16 between the adapter 18 and the bracket 19, a gap 20 for inserting a lever stopper is formed. The adapter 18 is formed in a substantially cylindrical shape, and a pin 21 is inserted into the adapter 18 so as to be orthogonal to the axis of the cylinder tube 16. A stopper guide 22 is rotatably supported at both ends of the pin 21. The stopper guide 22 has a substantially channel-shaped cross section and is formed so as to cover the overlapping portion of the stay 15 and the cylinder tube 16 between the adapter 18 and the bracket 19, and the free end portion of the stopper guide 22. A protrusion 23 is formed on the cylinder so as to protrude toward the cylinder tube 16.

The bracket 19 is formed in a substantially channel shape,
The opening side is arranged radially outward and is welded to the cylinder tube 16. A shaft hole 24 is formed in the opening end of the bracket 19 in a direction orthogonal to the axis of the cylinder tube 16.A pin 25 is inserted into the shaft hole 24, and lever stoppers 26 are provided at both ends of the pin 25. It is pivotally supported. The lever stopper 26 is formed in a substantially channel shape,
A pawl 27 is formed on the free end of the pawl 27 so as to engage with the teeth 17 and the rear end of the stay 15. That is, the lever stopper
The pin 26 rotates in the radial direction of the cylinder tube 16 with the pin 25 as a fulcrum, and the claw 27 is inserted into the gap 20 to engage with the rear end side of the stay 15 and the teeth 17. This claw 27 and teeth
The engagement with 17 prevents the piston rod 14 from shortening when the load of the cab 11 acts on the stay 15. A pair of pins 28 are provided at an intermediate portion of the lever stopper 26 so as to project outward in a direction orthogonal to the axis of the cylinder tube 16. The pins 28 oppose the protrusions 23 of the stopper guide 22 so as to be freely contactable. Has been done.

The lever stopper 26 is constantly urged in the counterclockwise direction by a spring (not shown) stretched between the lever stopper 26 and the cylinder tube 16, and the lever stopper 26 and The engagement is automatically performed by this spring, and the engagement is released by a releasing means (not shown) such as an operating wire linked to the lever stopper 26. After this release, the piston device 14 is expanded and contracted by the operation of the cylinder device 13.

 Next, the operation will be described.

When the cylinder device 13 is extended while the engagement between the claw 27 of the lever stopper 26 and the tooth 17 of the stay 15 is released,
The tilt operation of the cab 11 is performed by the extension operation of the piston rod 14. When the cab 11 reaches the specified upper limit position,
When the lever stopper 26 is rotated in the counterclockwise direction (hereinafter, the same) in FIG. 1 by the urging force of the spring, the pawl 27 is engaged with the rear end surface of the stay 15, so that the cab is rotated.
The stay 15 prevents the piston rod 14 from being shortened by the load of 11.

When the load of the cab 11 is applied to the stay 15 due to the engagement of the claw 27 and the rear end side of the stay 15, the lever stopper 26 is pinned to the lever stopper 26.
A rotational moment is generated in the counterclockwise direction with 25 as the fulcrum. At the same time, the pin 28 of the lever stopper 26 pushes the protrusion 23 of the stopper guide 22, so that the stopper guide 22 moves to the pin 21.
Is rotated clockwise about the fulcrum, and a rotational moment is generated in that direction. Therefore, the end surface of the stopper guide 22 on the stay 15 side presses the outer surface of the stay 15.
Therefore, the stay 15 is pressed against the outer peripheral surface of the cylinder tube 16 by the stopper guide 22.
The axial center line of the cylinder tube 16 and the axial center line of the cylinder tube 16 are matched as much as possible, and the buckling strength between the stay 15, the stopper guide 22, and the cylinder tube 16 is improved. As a result, the buckling strength of the cylinder device 13 is improved.

[Effect of device]

As described above, according to the present invention, when the stay is subjected to a load, the stay is pressed against the outer peripheral surface of the cylinder tube by the rotational moment acting on the stopper guide. The buckling strength of the device can be improved.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of an essential part showing a cab lowering prevention device according to an embodiment of the present invention, and FIG. 2 is a side view showing the entire structure,
3 is a sectional view taken along the line III-III of FIG. 2, FIG. 4 is a schematic side view showing a cavitating device to which the present invention is applied,
Is. FIG. 5 is an enlarged perspective view showing a conventional example. 10 …… Cab down prevention device, 11 …… Cab, 12 …… Frame, 13 …… Cylinder device, 14 …… Piston rod, 15
…… Stay, 16 …… Cylinder tube, 17 …… Tooth, 18…
… Adapter (stopper guide fixing part), 19 …… Bracket (lever stopper fixing part), 20 …… Air gap, 21 …… Pin, 22 …… Stopper guide, 23 …… Projection, 24 …… Through hole, 25 …… Pin, 26 …… Lever stopper, 27 …… Pawl, 28
...... Pin (holding part).

Claims (1)

(57) [Scope of utility model registration request] 1. A cab lowering prevention device for preventing a cab tilted by a cylinder device provided between a cab and a frame from being inadvertently lowered, the cab lowering prevention device being pivotally attached to the cab of the cylinder device. At the tip of the piston rod, there is rotatably mounted a stay in which a plurality of teeth are formed on the channel-shaped opening side, and the end of the stay on the piston rod side is the cylinder of the cylinder device. Attached to the outer circumference of the tube, a channel-shaped stopper guide is attached to the outer circumference of the cylinder tube so as to cover the overlapping portion of the stay and the cylinder tube. A lever stopper fixing portion is projected on the surface opposite to the lever stopper fixing portion. In a cab lowering prevention device in which a lever stopper having a pawl that can engage with the teeth of is rotatably supported, a surface of the outer periphery of the cylinder tube (16) opposite to the stay (15) A stopper guide fixing portion (18) is projected at a position closer to the tip end side than the lever stopper fixing portion (19), and the stopper guide fixing portion (18) has a tip end side of the stopper guide (22). The end is rotatably supported, and comes into contact with the free end of the stopper guide (22) at a position closer to the lever stopper fixing portion than the claw (27) of the lever stopper (26). A cab lowering prevention device characterized in that a free pressing part (28) is provided in a protruding manner.