JP2003013465A - Dozer device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable an extension blade to be held in an extension action posture and a storage posture without changing a position of an engagement body with respect to a main blade. SOLUTION: The main blade 2 has a support portion 2A on the rear side in the longitudinal direction end portion, and an extension blade 3 having an attachment portion 3A rotatably supported by the support portion 2A of the main blade 2. A detachable engagement member 4 is provided on a support portion 2A of the main blade 2, and the attachment portion 3A of the extension blade 3 is connected to the engagement member 4 when the extension blade 3 is in an extended action posture substantially along the main blade 2. An extended engagement portion that engages and a storage engagement portion that engages with the engagement body when the extension blade is in a retracted attitude on the rear side of the main blade are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dozer device mounted on a turning work machine such as a backhoe.

[0002]

2. Description of the Related Art A turning work machine such as a backhoe is provided with a pair of left and right traveling devices capable of changing a rut distance on a lower body, and an upper body rotatable around a vertical axis on the lower body. The dozer device is configured so as to project to the front, and the blades of the dozer device can be expanded and contracted so as to correspond to the expansion and contraction of the rut distance of the traveling device. That is, the dozer device is provided with a main blade having a support portion on the back side of both ends in the left-right direction, and an extension blade having an attachment portion pivotally supported by each support portion of the main blade. It is configured so as to have an extension action posture that is substantially along the main blade, or to have the extension blade be in a storage posture that is located behind the main blade and within the width of the main blade.

The prior art of this type of dozer device is as follows:
As disclosed in Japanese Patent No. 2855592, "the width in the left-right direction of the blade for soil removal is made variable by extending the extension blade to the main blade, and the extension blade is pivotally supported on the main blade. The rotation of the extension blade about the pivot shaft allows the extension blade to be housed behind the main blade and within the width of the main blade.
An extension locking hole for inserting the locking tool when the extension blade is extended and a storage locking hole for inserting the locking tool when the extension blade is stored are both provided on the main blade side,
On the side of the extension blade, an extension blade side locking hole that matches the extension locking hole and the storage locking hole is provided, and the same locking tool is inserted into the extension locking hole and the storage locking hole. Configured to do so. "

[0004]

In the above prior art, since the extension locking hole and the storage locking hole are provided on the side of the main blade, the position where the locking tool is locked is the extension of the extension blade. Since the time differs from the time of storage, the extension locking hole is in a state without a locking tool when the extension blade is stored.
This extension locking hole is located on the side end side of the main blade with respect to the pivotal support portion of the extension blade, and because the extension blade is not extended, mud is likely to be clogged,
If the mud is clogged, it may make it difficult to insert the locking tool when the extension blade is extended, or cause corrosion.

It is an object of the present invention to provide a dozer device capable of solving all the above problems. According to the present invention, the attachment portion of the extension blade is provided with an extension engagement portion that engages with the engagement body and a storage engagement portion, and the extension blade is stored in an extension action posture and storage without changing the position of the engagement body with respect to the main blade. An object of the present invention is to provide a dozer device that can be held in a posture and can reduce clogging of an engaging portion with which an engaging body engages.

[0006]

A first specific means for solving the problems in the present invention is a main blade 2 having a supporting portion 2A on the back side of the longitudinal end portion, and a supporting portion 2A of the main blade 2. And an extension blade 3 having a mounting portion 3A pivotally supported on the main blade 2 and a detachable engaging body 4 provided on the support portion 2A of the main blade 2 and extending to the mounting portion 3A of the extension blade 3. Blade 3 to main blade 2
An extension engaging portion 5 that engages with the engaging body 4 when in an extension action posture that is substantially in line with, and an engagement body 4 when the extension blade 3 is in a storage posture on the rear side of the main blade 2. The storage engagement portion 6 is provided.

Thus, the extension blade 3 can be held in the extended working posture and the storage posture without changing the mounting position of the engagement body 4 with respect to the main blade 2, and the support portion with which the engagement body 4 engages. The clogging of the engaging portion of 2A and the engaging portions such as the extended engaging portion 5 and the storage engaging portion 6 is reduced.
The second specific means for solving the problems in the present invention is
A traveling device 9 in which a pair of left and right rutted distances can be changed
In the swivel work machine, in which the upper body 10 is provided on the lower machine body 8 so as to be rotatable about the longitudinal axis, and the dozer device 1 is projected forward from the lower machine body 8, the dozer device 1 is provided with a rear surface at both left and right directions. Main blade 2 having support portion 2A on its side
And an extension blade 3 having a mounting portion 3A pivotally supported on each supporting portion 2A of the main blade 2, and an engaging body 4 which can be inserted into and removed from each supporting portion 2A of the main blade 2. Provided, the attachment portion 3A of each of the extension blades 3
And an extension engaging portion 5 that engages with the engaging body 4 when the extension blade 3 is placed in an extension action posture substantially along the main blade 2.
And a storage engagement portion 6 that engages with the engagement body 4 when the extension blade 3 is in a storage posture in which the extension blade 3 is accommodated behind the main blade 2 and within the width of the main blade 2.

Thus, the extension blade 3 can be held in the extension working posture and the storage posture without changing the insertion position of the engagement body 4 with respect to the main blade 2, and the support portion with which the engagement body 4 engages. The clogging of the engaging portion of 2A and the engaging portions such as the extended engaging portion 5 and the storage engaging portion 6 is reduced.
The third concrete means for solving the problems in the present invention is
In addition to the first or second specific means, the engaging body 4 is formed by a pin, the extension engaging portion 5 of the mounting portion 3A is formed by a pin hole, and the storage engaging portion 6 is formed on the outer periphery of the mounting portion 3A. It is formed by a notch.

As a result, only one pin hole is required. Since the pin hole is located inside the end of the main blade 2 when the extension blade 3 is in the storage posture, clogging is less likely to occur, and the storage engagement is ensured. Since the portion 6 is a notch, clogging of the soil does not occur.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 4 and 5 show the entire swivel work machine (rearward small swivel type backhoe) 7 including the dozer device 1 according to the present invention. The turning working machine 7 is provided with a pair of left and right traveling devices 9 capable of changing a rut distance on a lower machine body 8, an upper body 10 which is rotatable around a vertical axis 12 on the lower machine body 8, and is forward from the lower machine body 8. The hedder device 1 is projected and the excavation device 13 is provided at the front of the upper body 10.

In the lower body 8, side frames 16 are attached to the left and right sides of a central frame 15 having a slewing bearing 14, and the drive wheels 1 of the traveling device 9 are attached to the side frames 16.
7, a driven wheel 18, a plurality of rolling wheels 19, etc. are supported, and a crawler 20 made of rubber or metal is wound around these wheels to form a traveling device 9. The position of the side frame 16 can be adjusted in the left-right direction with respect to the center frame 15, and the distance between the left and right traveling devices 9 can be changed by adjusting the position with a hydraulic cylinder or the like. .

The upper body 10 has an engine, a fuel tank, an oil tank, etc. mounted on a swivel base 22 which is mounted on a swivel bearing 14 and swivels around a vertical axis 12, and a driver's seat 23 is mounted above and in front of the engine. The control unit 24 is mounted in front of the control unit 24, and the boom 2 of the excavator 13 is located in front of the control unit 24 at the right front.
The bracket 27 of No. 5 is mounted so that it can swing right and left around the vertical axis 26. The swivel base 22 has left and right side portions and a front portion that are substantially flat, and a rear portion and left and right front portions that have a substantially arc shape, and the maximum radius of the outer peripheral portion is set to be equal to or less than the maximum rut distance of the traveling device 9. . It is preferable that the distance between the right and left side portions of the swivel base 22 is substantially equal to the distance between the left and right outer ends when the traveling device 9 is set to the minimum rut distance.

1 to 5, the dozer device 6 is
An arm 30 that is pivotally supported on the front part of the lower body 8 so as to be swingable around a horizontal axis and protrudes forward, a main blade 2 fixed to the front end of this arm 30, and both left and right ends of this main blade 2. A pivoted extension blade 3 and the main blade 2
And a lower body 8 and a dozer cylinder 31 for moving the main blade 2 up and down. The main blade 2 has a blade plate having a rectangular shape in front view and an arc shape in side view,
A pair of upper and lower plate members are fixed to each other to form a support portion 2A on the back side of both ends in the left-right direction (longitudinal direction), and the support portion 2A is also fixed to the arm 30.

The extension blade 3 has a blade plate having a rectangular shape in a front view and an arc shape in a side view, and a mounting portion 3A is formed by fixing a pair of upper and lower plate materials to the rear surface side of the blade plate. It is substantially L-shaped in a plan view and has a blade plate fixed to one end and a round outer periphery at the other end. The attachment portion 3A is overlapped with the support portion 2A so as to be sandwiched from above and below. A hole 3B is formed at the center of curvature of the end of the mounting portion 3A, and the pivot 32 is inserted in the mounting portion 3A so as to be insertable and removable. A whirl stop plate 33 is fixed to the end of the pivot shaft 32, and the whirl stop plate 33 is attached to the mounting portion 3A by a screw 34 to prevent the pivot shaft 32 from coming off and the mounting portion 3A. It prevents relative rotation between the two.

The pivot shaft 32 is a support portion 2 of the main blade 2.
The extension blade 3 is inserted through a hole 2B formed in A, whereby the extension blade 3 can be swung with respect to the support portion 2A, and the posture (position) can be freely changed from the extended action posture to the stored (retracted) posture. The attachment portion 3A of the extension blade 3 is formed with an extension engagement portion (pin hole) 5 in the middle thereof, and a storage engagement portion (notch) 6 is formed in the arc outer peripheral portion of the end portion. It can be engaged with the united body (pin) 4. Engagement body 4
Has a U-shaped member fixed to the upper end of the pin to form a knob portion 4A, which can be inserted into and removed from a hole 2C formed in the support portion 2A of the main blade 2.

When the extension blade 3 is placed in an extension action posture substantially along the main blade 2, the extension engagement portion 5 faces the hole 2C, and the engagement body 4 is engaged with both of the extension engagement portion 5 and the extension blade 3 as shown by the solid line in FIG. As shown, it can be fixed (held) in the extended posture. At this time, the traveling device 9 can be set to the maximum rutted distance. By pulling out the engaging body 4 from the extension engaging portion 5, the extension blade 3 can be rotated about the pivot shaft 32, and the extension blade 3 can be rotated as shown by the phantom line in FIG. 1 and the solid line in FIG. When the storage position is such that the main blade 2 is located behind both widthwise ends and within the width of the main blade 2,
The storage engagement portion 6 faces the hole 2C, and the engagement body 4 is engaged with both of them, whereby the storage posture can be fixed. At this time, the traveling device 9 is set to the minimum rutted distance.

The extension blade 3 is fixed to the extension action posture and the storage posture by the engagement body 4 formed of one pin, and the insertion position of the engagement body 4 with respect to the main blade 2 is changed. The engaging body 4 is always inserted into the hole 2C formed in the support portion 2A, and the mud does not enter the hole 2C in either posture. Support part 2A
Since only one hole 2C is formed in the main blade 2, the processing of the main blade 2 is easier than in the conventional technique. When the extension blade 3 is fixed in the extension action posture, the engagement body 4 is not engaged with the storage engagement portion 6, but since it is not a hole, mud is not clogged. The storage engagement portion 6 is the main blade 2
Since it is located at a position recessed from the end (the center side of the blade), mud will not be clogged even if it is formed by a hole, but the distance from the pivot 32 to the outer periphery of the end of the mounting portion 3A must be set large. Therefore, in order to make the extension blade 3 rotatable, the distance from the main blade 2 to the pivot 32 must be increased.

In other words, if the storage engagement portion 6 is formed by the notch, the distance from the main blade 2 to the pivot shaft 32 can be shortened and the distance from the pivot shaft 32 to the engagement body 4 can be increased, so that the extension can be achieved. The attachment strength of the extension blade 3 to the main blade 2 in the working posture can be improved. Also,
Both the engaging body 4 and the pivot shaft 32, the support portion 2A and the mounting portion 3
Since it can be easily inserted and removed from A, both can be easily removed when the extension blade 3 is not used at all.

The present invention is not limited to the above embodiment, but can be variously modified. For example,
The storage posture of the extension blade 3 is approximately 10 from the extension action posture.
It may be a position rotated by 0 degrees or a position rotated by about 180 degrees as long as the extension blade 3 is hidden within the width of the main blade 2. Further, the swivel work machine 7 is an ultra-small swivel type in which the pivotal support portion of the boom 25 is near the center of the swivel base 22, a standard type in which the rear part thereof projects laterally from the traveling device 9 when the swivel base 22 swivels. May also be
The dozer device 1 may be applied to the case where the traveling device 9 has a fixed rut distance.

[0020]

According to the present invention described in detail above, the extension blade 3 is held in the extension working posture and the storage posture without changing the position of the engaging body 4 with respect to the support portion 2A of the main blade 2. Support part 2A that can be placed and is engaged by the engaging body 4
It is possible to reduce clogging of the engaging portions such as and the engaging portions such as the extended engaging portion 5 and the storage engaging portion 6 of the attachment portion 3A of the extension blade 3.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of an extension blade extension action posture showing an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the extended blade storage posture.

FIG. 3 is a side view of the extended blade extension action posture.

FIG. 4 is an overall plan view of a turning work machine.

FIG. 5 is an overall side view of a turning work machine.

[Explanation of symbols]

1 Dozer device 2 main blade 2A support 3 extension blade 3A mounting part 4 engagement body 5 Extension engagement part 6 Storage engagement part 7 Turning work machine 8 Lower fuselage 9 traveling devices 10 Upper body 32 pivot

Claims (3)

[Claims] 1. A support for a main blade, comprising: a main blade having a support portion on a rear surface side of a longitudinal end portion; and an extension blade having an attachment portion pivotally supported on the support portion of the main blade. A detachable engagement body, and the extension blade mounting portion has an extension engagement portion that engages with the engagement body when the extension blade is in an extension action posture substantially along the main blade; A dozer device, comprising: a storage engagement portion that engages with the engagement body when the blade is in the storage posture on the rear side. 2. A lower body is provided with a pair of left and right traveling devices capable of changing a rut distance, an upper body is provided on the lower body so as to be rotatable about a longitudinal axis, and a dozer device is projected forward from the lower body. In the working machine, the dozer device includes a main blade having a support portion on the back side of both end portions in the left-right direction, and an extension blade having an attachment portion pivotally supported on each support portion of the main blade, An extension member is provided at each support portion of the main blade, and an extension member that engages with the engagement member when the extension blade is placed in an extension action posture substantially along the main blade is provided at a mounting portion of each extension blade. A dozer device, characterized in that a dowel portion and a storage engagement portion that engages with the engagement body when the extension blade is in a storage posture that is located behind the main blade and within the width of the main blade are provided. . 3. The engagement member is formed of a pin, the extension engagement portion of the attachment portion is formed of a pin hole, and the storage engagement portion is formed of a notch on the outer periphery of the attachment portion. Item 3. The dozer device according to item 1 or 2.