JPH04265319A - Width variable blade - Google Patents

Abstract

PURPOSE:To make it possible to project and retract an extension blade instantaneously without removing any bolt or nut and without a tool in the case where the width of the blade attached to a back-hoe, etc., can be changed. CONSTITUTION:Up and down pivots 24 are provided to the rear of a main blade 11, and an extension blade 10 is turned by 180 deg. horizontally. A turning bearing lever 33 is projected from the extension blade 10, and the extension blade 10 is turned by 180 deg. up and down with the turning bearing lever 33 as the center. According to the constitution, the extension blade 10 can be retracted to the rear of the main blade 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a blade used when removing soil by a backhoe or the like can be changed according to the width of a crawler.

0002

2. Description of the Related Art Conventionally, techniques for configuring blades of backhoes and the like to vary the width of the blades have been known. However, the conventional technology was constructed as shown in FIGS. 11, 12, and 13. Figure 1
1 is a perspective view of a conventional variable width blade, FIG. 12 is a sectional plan view of the extension blade 10 in a wide width state, and FIG. 13 is a sectional plan view of the extension blade 10 in a narrow state. That is,
With respect to the main blade 11, when the extension blade 10 is fixed facing outward, it becomes wide, and when it is overlapped towards the inside, it becomes narrow. In this way, the extension blade 10 can be attached and detached from the main blade 11 using bolts and nuts. However, since it is troublesome to attach and detach the extension blade 10 using bolts and nuts, it has not been used much.

0003

SUMMARY OF THE INVENTION The present invention solves the problems of the prior art, and is constructed so that it can be easily attached and detached without the need for tools. Also, when storing the extension blade, the configuration is such that it can be easily changed to the stored state by simply slightly moving the extension blade in the protruding state.

0004

[Means for Solving the Problems] The problems to be solved by the present invention are as described above, and next, the means for solving the problems will be explained. In other words, in a configuration in which the width of the blade for soil removal is variable by extending the extension blade to the main blade, the extension blade can be moved horizontally around the vertical pivot shaft fitted to the pivot bracket on the back of the main blade. The main blade can be rotated to switch between extension and storage, and the extension blade can be fixed by inserting and removing a locking pin that engages the main blade and the extension blade. In addition, a retaining rod is provided on the top surface of the pivot bracket at an upper position where the grip knob of the retaining pin engages to prevent the retaining pin that retains the extension blade from the main blade from coming off upward. A grip knob rotation prevention stopper is provided upright on a pivot bracket to prevent the grip knob from rotating to a portion without a retaining rod. Also, the rotation support rod is horizontally protruded from the extension blade, inserted into the extension blade support tube fixed on the back side of the main blade, and the rotation support rod is rotated 180 degrees up and down within the extension blade support tube. This makes it possible to switch between a state in which the extension blades extend to the left and right ends of the main blade and a state in which they overlap and can be stored at the rear of the main blade.

[0005]

[Operation] Next, the operation will be explained. The backhoe of the present invention is
The width and height of the crawler devices 18L and 18R can be changed, and the width of the blade can be adjusted according to the change in the width of the crawler. The main blade 11 is a blade with a normal width, and extension blades 10 can be extended to the left and right sides of the main blade 11. The extension blade 10 can be extended by rotating horizontally around the vertical pivot shaft 24, or by rotating 180 degrees vertically around the rotation support rod 33 and sliding the main blade 11. There is a way to store them in an overlapping state on the back.

[0006]

[Example] Next, an example of the present invention will be described. FIG. 1 is a rear perspective view of a backhoe equipped with a variable width blade of the present invention, FIG. 2 is a plan view of the blade portion, FIG. 3 is a side view of the blade portion, and FIG. 4 is a rear sectional view showing a crawler width adjustment device. 5 is a plan view showing the pivot portion of the extension blade 10,
6 is a plan view of the pivot portion of the vertical pivot shaft 24, FIG. 7 is a side sectional view, and FIG. 8 is a side sectional view of the locking pin 21.
FIG. 9 is a perspective view showing another embodiment of the extension blade 10, and FIG. 10 is a side sectional view of the same.

A backhoe will be explained with reference to FIG. As shown in FIG. 4, the left and right crawler devices 18L and 18R are configured so that their widths can be adjusted in the left and right directions, and by adjusting the crawler widths, the vertical positions of the crawlers can be adjusted at the same time. When the width of the crawler changes in this way, it is necessary to change the width of the blade accordingly. In the present invention, the blade is divided into a main blade 11 and an extension blade 10, and the extension blade 10 can be freely extended and retracted with a single touch. This will be explained with reference to FIGS. 2 and 3. A swivel base bearing 20 is arranged between the left and right crawler devices 18L and 18R, and a blade support rod 3 is disposed in front of the swivel base bearing 20.
1 rear pivot 28 is provided. Further, a blade cylinder 26 for moving the blade up and down is arranged between the left and right pivots 28. The present invention also relates to a blade mechanism that can be divided into a main blade 11 and an extension blade 10.

FIG. 4 discloses a width adjustment device for crawler devices 18L and 18R. A swivel base bearing 20 is arranged in the center of the traveling base, and lower frames 16 are provided at the front and rear positions of the traveling base. A pivot pin 8, which is a pivot portion of the variable leg links 2 and 3, is provided in the lower frame 16.
・10 is provided. The variable leg links 2 and 3 protrude left and right, and are also arranged front and rear. A total of four pairs are arranged in the front, rear, left and right, and support the track frame 7 in a vertically adjustable manner. Left and right adjustment cylinders 1L and 1R are arranged on the side closer to the front between the front and rear variable leg links 2 and 3. As shown in FIG. 4, the pivot positions of the adjustment cylinders 1L and 1R are the variable leg links 2 and 1R.
There is a discrepancy between the pivot position in No. 3 and the plan view.

Pivot pin 9 of the adjustment cylinders 1L and 1R
is extended and protruded from the position of the bracket 29 of the adjustment cylinders 1L and 1R to the lower frame 16, and the variable leg link 2
・It is arranged on the same plane as the pin heads 4 and 6 of the pivot pins 8 and 10 of 3. The variable leg links 2 and 3 are pivot brackets 13
It is pivotally supported by pivot pins 11 and 14. In addition, the adjustment cylinders 1L and 1R are attached to the pivot bracket 15 with the pivot pin 1.
It is supported by 2. 7 is a track frame, and 22 is a track roller.

Next, the protruding and retracting mechanism of the extension blade 10 will be explained with reference to FIGS. 5, 6, 7, and 8. Up and down pivot brackets 25 and 2 are provided on the back side of the main blade 11.
5 protrudes, and a vertical pivot shaft 24 is pivotally supported between the pivot brackets 25. The pivot brackets 25, 25
An extension blade bracket 23 is fitted in between, and is pivotally supported by a vertical pivot shaft 24. By rotating the extension blade bracket 23 around the vertical pivot shaft 24,
The extension blade 10 is in the protruding state shown in FIG. 5 and in the retracted state 10'.
This means that it can be stored in. A locking pin 21 is provided for fixing the locking pin 21 in the stored state and the extended state, and one hole for inserting the locking pin 21 is provided in the extension blade bracket 23. Two holes are provided on the left and right sides of the vertical pivot shaft 24.

In the case of FIGS. 6 and 7, a grip knob 30 is provided at the upper end of the locking pin 21, and a retaining rod 32 that locks the grip knob 30 and prevents it from coming off upward is provided. The pivot brackets 25, 25 are erected in an inverted U shape on the upper surface. The grip knob 3 is placed below the inverted U-shaped retaining rod 32.
A grip knob rotation prevention stopper 29 is provided upright to prevent the 0 from moving from side to side. The structure is such that there is no need to insert a locking pin into the portion where the locking pin 21 protrudes downward from the pivot brackets 25, 25. That is, above the locking pin 21, a grip knob rotation prevention stopper 29 and a removal prevention rod 32 are provided as a locking portion of the grip knob 30. When inserting the locking pin 21 after rotating the extension blade bracket 23 by 180 degrees, first grasp the grip knob 30, insert the locking pin 21 into the hole, and then rotate the grip knob 30 as shown in the figure. 6, 30', the grip knob is lowered to a state where it is placed on the rotation prevention stopper 29. After that, slide over the grip knob rotation prevention stopper 29 to the lower surface of the retaining rod 32.
The grip knob 30 is rotated around the locking pin 21. At this time, there is a gap between the retaining rod 32 and the grip knob rotation prevention stopper 29 that allows the grip knob 30 to move.
It rotates downward, then comes off the upper surface of the grip knob rotation prevention stopper 29 and falls between the upright portion of the grip knob 30 and the grip knob rotation prevention stopper 29. As a result, the grip knob 30 cannot be moved left or right, and even if it tries to come out upwards, it cannot come out because of the stopper rod 32.

Next, the embodiments shown in FIGS. 9 and 10 will be explained. In this configuration, the extension blade 10 is supported by a rotation support rod 33 which is a horizontal axis, and the rotation support rod 3
3 is fitted into an extended blade support tube 34 fixed to the rear surface of the main blade 11. The rotation support rod 33 rotates up and down 180 degrees within the extension blade support cylinder 34, so that the extension blade 10 is stored in the rearward state as shown in FIG. 10. In the storage state 10', the main Since it will not interfere with the blade 11, remove the locking pin 35 and then rotate the rotation support rod 33 by 180 degrees.
By inserting the extension blade 10 into the storage hole 36, the extension blade 10 is stored in the rear part of the main blade 11 in an overlapping manner.

[0013]

[Effects of the Invention] Since the present invention is constructed as described above, the following effects can be achieved. In other words, since the structure is configured as claimed in claim 1, it is possible to change the blade width with a single touch when changing the width of the crawler devices 18L and 18R, without having to manipulate bolts and nuts with tools as in the past. It is. As a result, when the width of the crawler is increased, work can be performed using a wider blade. Further, when the extension blade 10 is configured to have a narrow width, the extension blade 10 can be stored in an overlapping state at the rear of the main blade 11, so that the storage space for the extension blade 10 is not taken up.

[0014] Since the structure is as set forth in claim 2, the locking pin 2
It is now possible to prevent the locking pin 21 from coming off by the locking rod 32 provided above the locking lever 32 and the grip knob rotation prevention stopper 29 installed on the side. It is no longer necessary to insert a retaining pin such as a pine needle pin into the protruding part, and there is no longer a need to lose the pine needle pin as was the case in the past.

[0015] Since the structure is configured as in claim 3, the storage state can be achieved simply by rotating 180 degrees up and down about the center of the rotary support rod 33, so that the locking pin 35 can be easily replaced by simply replacing the locking pin 35. , the extension blade 10 can be protruded and stored.

[Brief explanation of the drawing]

FIG. 1 is a rear perspective view of a backhoe equipped with a variable width blade of the present invention.

FIG. 2 is a plan view of a portion of the blade.

FIG. 3 is a side view of a portion of the blade.

FIG. 4 is a rear sectional view showing the crawler width adjusting device.

FIG. 5 is a plan view showing the pivot portion of the extension blade 10. FIG.

6 is a plan view of the pivot portion of the vertical pivot shaft 24. FIG.

FIG. 7 is a side sectional view as well.

FIG. 8 is a side sectional view of the locking pin 21 portion.

9 is a perspective view showing another embodiment of the extension blade 10. FIG.

FIG. 10 is a side sectional view as well.

FIG. 11 is a perspective view of a conventional variable width blade.

FIG. 12 is a plan sectional view of the conventional extension blade 10 in a wide state.

FIG. 13 is a plan cross-sectional view of the extension blade 10 in a narrow state.

[Explanation of symbols]

10 Extension blade 11 Main blade 21 Locking pin 23 Extension blade bracket 24 Vertical pivot axis 25 Pivot bracket 29 Grip knob rotation prevention stopper 30 Grip knob 32 Preventing rod 33 Rotating support rod 34 Extension blade support tube 35 Locking pin

Claims (3)

[Claims] Claim 1: In a configuration in which the width of the soil removal blade is made variable by extending an extension blade to the main blade, the width of the blade is extended around a vertical pivot shaft fitted to a pivot bracket on the back of the main blade. A variable width blade, characterized in that it can be switched between extension and storage by horizontally rotating the blade, and the extension blade is fixed by inserting and removing a locking pin that engages the main blade and the extension blade. 2. The variable width blade according to claim 1, wherein the grip knob of the locking pin engages a retaining rod that prevents the locking pin that locks the extension blade from being pulled out upwardly. A variable width pivot bracket, characterized in that a grip knob rotation prevention stopper is provided upright on the upper surface of the pivot bracket at an upper position to prevent the grip knob from rotating to a portion without a retaining rod. blade. Claim 3: In a configuration in which the width of the blade for soil removal is made variable by extending an extension blade to the main blade, a rotary support rod is horizontally protruded from the extension blade and is fixed to the back surface of the main blade. By inserting the extension blade into the extension blade support cylinder and rotating the rotary support rod 180 degrees up and down within the extension blade support cylinder, the extension blade can be extended to the left and right ends of the main blade, and the main blade can be extended to the left and right ends of the main blade. A variable-width blade that can be switched between an overlapping state and a retractable state at the rear.