JPH0512368Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a lifting device for an attachment mounted on a construction machine such as a motor grader.

BACKGROUND TECHNOLOGY Conventionally, construction machines such as motor graders have been equipped with attachments c such as an angle plow or a front blade, which can be attached to the front of a vehicle body a via a lifting device b, as shown in FIG. There is. The elevating device b is provided with a lift cylinder e on the diagonal of the four-bar parallel link d, and is configured to extend and retract the lift cylinder e to elevate and lower an attachment c attached to the tip of the parallel link d.

Problems that the invention aims to solve In construction machines equipped with the above-mentioned attachment C, the lifting height of the attachment C is limited so that it does not obstruct the forward view when forwarding. The height is set so that the lower edge does not interfere.

However, when carrying out snow removal work while discharging snow from the railings of a bridge, for example, there have been problems such as the inability to perform the work with the above-mentioned lifting device with a limited lift height.

This invention was made for the purpose of improving the above-mentioned problems.

Means and action for solving the problem In an attachment that is movable up and down through a lift device body consisting of a four-bar parallel link and a lift cylinder at the front of the vehicle body, there is a gap between the mounting member of the attachment and the lift cylinder. An attachment elevating device for construction machinery in which the lifting height of the attachment can be arbitrarily set by providing means for varying the stroke of a lift cylinder.

Embodiment To explain in detail one embodiment of this invention shown in the drawing, 1 is the main body of a lifting device attached to the front part of the vehicle body 2 of a construction machine such as a motor grader, and there are four parallel sections spaced apart in the vertical direction. It consists of a link 3 and a lift cylinder 4. One end of each parallel link 3 is pivotally connected to a bracket 5 attached to the vehicle body 2 side by a pin 6, and the other end of each parallel link 3 is pivotally connected to a mounting member 8 of an attachment 7 by a pin 9. ing.

The attachment 7 is, for example, an angling plow, a V-shaped plow, or a front blade, and is attached to the front surface of the mounting member 8. The lift cylinder 4 is provided between the upper portion of the mounting member 8 and a shock absorbing mechanism 10 provided on the bracket 5 side so as to be positioned approximately on the diagonal line of each parallel link 3. The shock absorbing mechanism 10 has an inverted L-shaped lever 11 whose bent portion is pivoted to the bracket 5.
A shock absorbing member 12 such as a spring is provided between one end of the bracket 5 and the upper part of the bracket 5 to absorb shock.

The tip of the piston rod 4a of the lift cylinder 4 is pivotally attached to the other end of the lever 11, and the proximal end of the lift cylinder 4 is pivotally attached to the upper part of the movable bracket 13 by a pin 14. The lower part 13 of the movable bracket 13 is rotatably supported on the upper part of the mounting member 8 by a pin 15, and the movable bracket 13 has a plurality of, for example three, Pin holes 13 ₁ , 13 ₂ , 13 ₃ are bored.
These pin holes 13 ₁ , 13 ₂ , 13 ₃ are formed by rotating the movable bracket 13 around the pin 15 so that a bracket 16 protruding from the mounting member 8 can be formed.
By selecting one of these pin holes 13 ₁ , 13 ₂ , 13 ₃ and inserting the locking pin 17 through the pin hole 16 a of the bracket 16, The rising height of the attachment 7 can be set as follows.

Next, to explain the action, the normal movable bracket 1
3 is fixed at the position shown by the solid line in FIG. ₂ by inserting the locking pin 17 into the pin hole 132.
At this time, the maximum lifting height of the attachment 7 is X mm, and the maximum excavation depth is Y mm.

Next, if a higher lifting height is required for work reasons, the movable bracket 13 can be rotated to the position shown by the broken line in FIG. 2 by pulling out the locking pin 17 and contracting the lift cylinder 4. Insert the stop pin 17 into the pin hole ₁₃₁ . As a result, the distance between both ends of the lift cylinder 4 is shortened, and the lift cylinder 4 is elongated in the direction of increasing the lifting height of the attachment 7, and the stroke of the excavation depth is conversely shortened. becomes equivalent to As a result, the lifting height of the attachment 7 becomes X+αmm, and the excavation depth becomes Y−αmm. Since the excavation depth becomes high, it becomes possible to cross over the railing of a bridge and to discharge snow, for example.

Conversely, if it is desired to further deepen the excavation depth of the attachment 7, the locking pin 17 can be inserted into the pin hole ₁₃₃ of the movable bracket 13.

Pin holes 13 ₁ , 1 into which the locking pin 17 is inserted
When 3 ₂ and 13 ₃ are changed, the trajectory of the pin 14 that connects the movable bracket 13 and the lift cylinder 4 is as follows.
It changes for each pin hole 13 ₁ , 13 ₂ , 13 ₃ . This allows the operating range of the attachment 7 to be made larger or smaller depending on the attachment 7, so attachments that require a large operating range can have a large operating range, and attachments that require a small operating range can have a large operating range. A small operating range can be easily selected by replacing the locking pin 17.

Effects of the invention As detailed above, with this invention, the rising height of the attachment can be set arbitrarily according to the work content, so there are fewer restrictions on the work content, and it is possible to simply attach and remove the locking pin. If the height can be set, operability will be greatly improved.

In addition, by replacing the locking pin, a large operating range can be selected for attachments that require a large operating range, and a small operating range can be selected for attachments that require a small operating range, so selecting a large operating range can improve efficiency. By performing tasks or selecting a small operating range, you can move the attachment slightly to easily perform delicate tasks.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, with FIG. 1 being a side view, FIG. 2 being an enlarged view of the main parts, and FIG. 3 being an explanatory diagram of the conventional device. 1 is the lifting device main body, 2 is the vehicle body, 3 is the parallel link, 4 is the lift cylinder, 7 is the attachment,
8 is a mounting member.

Claims (1)

[Scope of utility model registration request] An attachment mounting member 8 is provided at the front of the vehicle body 2 via a four-bar parallel link 3, and a lift cylinder 4 with one end pivoted to the vehicle body 2 is provided diagonally to the four-bar parallel link 3. The other end of the cylinder 4 is pivoted by a pin 15 to the other end of a movable bracket 13 which is rotatably supported on the upper part of the attachment mounting member 8, and is pivoted to the movable bracket 13 about the pin 15. A plurality of pin holes 13 ₁ , 13 ₂ , 13 on the circumference
₃ , and these pin holes 13 ₁ , 13 ₂ , 13 ₃
The movable bracket 13 and the attachment mounting member 8 are connected by the locking pin 17 selectively inserted into one of the
An attachment elevating device for construction machinery that connects the two.