JPS635525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blade for an earthmoving vehicle as a working device mounted on the earthmoving vehicle.

Generally, when removing snow that has accumulated on a road or the ground, a blade is attached to an earth-moving vehicle (for example, a wheeled loader) as a working device, and the earth-moving vehicle is used as a snow-removing machine. During snow removal work, obstacles such as roadside curbs, utility poles, large stones on the ground, and manhole covers are covered with snow, making it difficult for drivers to spot snow-covered obstacles. As a result, during snow removal work, some of the blades (especially the cutting edges fixed to the blade body) that are attached to the earthmoving vehicle accidentally collide with obstacles on the road, causing damage to the blades (especially the cutting edges). ), there were many accidents that deformed or damaged the hydraulic cylinder mechanisms of earthmoving vehicles.

Therefore, in order to eliminate the above-mentioned accidents, various improvements have been made to the blade so that when a large impact is applied to the blade, the blade is configured to soften the impact, and this has been proposed and put into practical use. Improved blades include, for example, blades in which the entire blade including the blade body and cutting edge moves back and forth or reversely upon impact, and blades in which the entire cutting edge attached to the blade body ( (or a part of the blade) moves up and down or reverses due to impact, etc. However, in these cases, when the entire blade is moved, the structure becomes larger and the blade moves during work. There is a risk that the cutting edge may swing, and in cases where the cutting edge is moved, it is difficult to withstand large forces because the cutting edge is held in the working state by the action of a spring. In addition, there is a risk that the blade may swing during operation.

The present invention has been made in view of the above facts, and its purpose is to be able to reliably hold the cutting edge in a working state, and also to reliably buffer the impact when a large impact is applied to the cutting edge. It is an object of the present invention to provide a blade for an earthmoving vehicle which is further improved and has a simple structure.

According to the present invention, a blade main body mounted on an earthmoving vehicle, a cutting edge support having a cutting edge fixed to the lower end thereof, and one end thereof connected to the blade main body so as to be pivotable about a first axis. and a connecting member whose other end is pivotally connected to the cutting edge support about a second axis, and a shear pin interposed between the blade body and the cutting edge support. a shear pin mechanism that holds the cutting edge support in a working state, and when an impact is applied to the cutting edge to cause the cutting edge to pivot in a predetermined direction about the second axis, the impact is applied to the cutting edge. If the impact force acting on the shear pin of the shear pin mechanism is large, the shear pin is severed, and the cutting edge is moved along the first axis and the second axis integrally with the cutting edge support. Provided is a blade for an earthmoving vehicle, which is characterized in that the blade is pivoted about the center of the earth and the impact is dynamically damped.

Hereinafter, a specific example of a blade for an earthmoving vehicle constructed in accordance with the present invention will be described with reference to the accompanying drawings.

Referring to Figure 1, the blade for an earthmoving vehicle, generally designated by the number 2 (Figure 1 shows the bottom view of blade 2, so the left half thereof is shown in Figure 1), is located at the front end of the earthmoving vehicle. The blade main body 4, cutting edge support 6, and cutting edge 8 are provided. As can be understood from FIG. 1, the cutting edge support 6 and the cutting edge 8 are arranged in the width direction (the left-right direction in FIGS. 1 and 2, and the direction perpendicular to the plane of the paper in FIGS. 3 and 4). It is divided into two parts, and a cutting edge 8 is fixed to each cutting edge support 6. In the following description, the configuration of the left half of the earthmoving vehicle blade 2 will be explained, but the configuration of the right half is substantially the same as the configuration of the left half.

Next, referring to FIGS. 2 to 4 together with FIG. 1, the blade body 4 includes a blade body portion 10 having a concave curved front surface. The cutting edge support 6 is attached to the blade body 4 in the following manner. The cutting edge support 6 includes a plate main body 12, and end plates 14 are fixed to both ends of the back surface of the plate main body 12.
2 (therefore, between both end brackets 14), there are mounting brackets 18 (5 mounting brackets are provided on one of the plate main bodies 12 which is divided into two), which are made up of a pair of plates 16 and are spaced apart from each other. It is placed and fixed. In the illustrated example, the mounting bracket 18 disposed at the left end (therefore, the right end in FIG. 1) of the plate body 12 is composed of one end plate 14 and one end plate 16. Therefore, even in the right half of the blade 2 (not shown), the mounting bracket disposed at the right end of the plate main body is composed of one end plate and a plate). On the other hand, at the rear end of the bottom surface of the blade main body 10 of the blade main body 4, there are mounting brackets 22 consisting of a pair of plates 20 (five mounting brackets 22 are provided on the left half of the blade main body 10 in correspondence with the above-mentioned mounting brackets 18). ) are fixed at intervals. One end of a connecting member 26 is rotatably connected between the plates 20 of each of the mounting brackets 22 via a connecting pin 24. The other ends of the connecting members 26 each include a connecting rod extending from one end fixed to one end plate 14 through the plate 16 of the mounting bracket 18 to the other end fixed to the other end plate 14. Between the plates 16 of each mounting bracket 18 fixed to the plate main body 12 via the member 28 (in the case of the mounting bracket 18 fixed to the left end of the plate main body 12, one end plate 14 and the plate 16 (Therefore, in the right half of the blade 2 (not shown), the mounting bracket disposed at the right end of the plate body also has a connection between the end plate and the plate. (The other end of the connecting member is pivotally connected to the connecting member.)
Therefore, the cutting edge support 6 is
The connecting rod member 2 is rotatable with respect to the blade body 4 integrally with the connecting member 26 about the central axis of the connecting pin 24 (constituting the first axis).
The connecting member 26 is rotatably attached to the connecting member 26 about the central axis (constituting the second axis) of the connecting member 8 (see also FIG. 6).

To further explain mainly with reference to FIGS. 1, 2, and 4, the cutting edge support 6
A locking rod member 30 is fixed to the upper end of the back surface of the plate body 12, and extends across the entire width thereof (in the left-right direction in FIG. 1, in the direction perpendicular to the plane of the paper in FIGS. 3 and 4). ing. More specifically, the locking rod member 30 extends in the width direction from one end fixed to one end plate 14 to the other end fixed to the other end plate 14, and the intermediate portion thereof is connected to the plate body. 12 and the upper end of the plate 16 constituting the mounting bracket 18. On the other hand, a receiving portion is defined at the lower end of the blade body 4, in which the locking rod member 30 is received as described below. In a specific example, the front part of the bottom surface of the blade main body part 10 of the blade main body 4 in the front-rear direction (up-down direction in FIGS. 1 and 2, left-right direction in FIGS. 3 and 4) has a lateral direction. Receiving members 32 (as shown in FIG. 1, five receiving members 32 are provided on the left half of the blade main body 10) are fixed at intervals. The receiving members 32, excluding the receiving member 32 fixed to the right end of the blade main body 10, are composed of a pair of plates 36 each having a recess 34 defining a receiving portion open to the front. The plates 36 are disposed on both sides of the pair of plates 20 in correspondence with the mounting brackets 22, respectively. Further, the receiving member 32 fixed to the left end of the blade body 10 is composed of a single plate 40 in which a recess 38 defining a receiving portion open to the front is formed. A mounting bracket 22 is disposed substantially between a pair of plates 20 of a mounting bracket 22 secured to the left end of the section 10. (Therefore, in the right half of the blade 2 (not shown), the blade main body 10
The receiving member fixed to the right end of the blade is also composed of a single plate, and this plate is connected to the blade body 1.
(located approximately between a pair of plates of a mounting bracket secured to the right end of the 0).

In connection with the locking rod member 30 fixed to the plate body 12 and the receiving portion defined in the blade body 4, there is also a gap between the blade body 4 and the cutting edge support 6 as shown in FIG. As shown in FIGS. 3 and 5, shear pin mechanisms 42 are provided (although only one shear pin mechanism 42 is shown in the drawings, they are provided on both the left and right sides of the blade 2). Shear pin mechanism 4
2 includes a shear pin 44, and this shear pin 44 is formed with spaced apart notches 44a (two in the specific example). Shear pin 4
4, as shown in FIGS. 2 and 5, a sleeve member 46 fixed to a hole in the plate 16 constituting the mounting bracket 18 fixed to the left end of the plate main body 12; and a bottom surface of the blade main body 10. A sleeve member 48 is fixed to a hole formed in the plate 40 fixed to the left end of the plate, and a sleeve member 48 is fixed to a hole formed in an auxiliary plate 50 fixed to the inside of the plate 16 on the back side of the plate main body 12. The sleeve member 52 is inserted through the sleeve member 52 in this order, and the notch 4 on one side of the shear pin 44 is inserted.
4a is located between the plate 16 and the plate 40, and the other notch 44a is located between the plate 40 and the auxiliary plate 50 (therefore, the cutout 44a is located at the right end of the blade 2). Although not shown, the shear pin of the shear pin mechanism shown in FIG.
A sleep member is fixed to a hole formed in a plate fixed to the right end of the blade main body 10, and a sleep member is fixed to a hole formed in an auxiliary plate fixed to the inside of the plate on the back side of the plate main body. (through the sleeve member in this order and positioned as described above). Thus, the above-mentioned cutting edge support 6
is the shear pin 44 of the shear pin mechanism 42,
The connecting rod member 28, the connecting member 26 and the connecting pin 24 hold it in the working condition shown in FIGS. 2, 3 and 4. In such a working state, as is clear from FIGS. 3 and 4, the locking rod member 30 fixed to the back surface of the plate body 12 is connected to the receiving portion (more specifically, the plate 36) defined in the blade body 4. recess 34 formed in
and a recess 38) formed in the plate 40 to ensure that the cutting edge support 6 is held in the working condition.

The cutting edge 8 is fixed to the cutting edge support 6 attached to the blade body 4 as described above. As shown in FIGS. 1, 2, and 4, the lower end of the plate body 12 of the cutting edge support 6 has a
A plurality of holes are formed at intervals in the left-right direction in FIGS.
A plurality of holes are formed at intervals in the width direction in the middle part of the plate body in the vertical direction, and the cutting edge 8 is connected to the plate body by a plow bolt 52 and a nut 54 that are fitted through these holes. 12
is fixed to the lower edge of the front surface. The lower end of the cutting edge 8 projects further downward beyond the lower end of the plate body 12.

In the blade 2 having the blade body 4, the cutting edge support 6, and the cutting edge 8 configured as described above, a guide means 56 is further provided on the bottom surface of the blade body 10 (see FIGS. 1 and 1). (See Figure 2). The guide means 56 is disposed corresponding to the connecting members 26 except for the connecting member 26 disposed at the left end of the blade body 10 (therefore, in the right half of the blade 2, the guide means 56 is provided at the right end of the blade body 10). The blade body 10 has a pair of guide plates 58 depending downwardly from the bottom surface of the blade main body 10. Each of the pair of guide plates 85 is disposed on both sides of the connecting member 26, one guide plate 58 has a guide surface 60 that guides one side of the connecting member 26, and the other guide plate A guide surface 60 for guiding the other side of the connecting member 26 is defined at 58 . Therefore, when the connecting member 26 is pivoted as described below, the connecting member 26 will move toward the guide plate 58.
is guided along a guide surface 60.

Furthermore, an elastic buffer means 62 is provided on the bottom surface of the blade main body 10 (see FIGS. 1, 2, and 4). The elastic buffer means 62 is disposed corresponding to the connecting member 26 guided by the guide means 56, and includes an elastic buffer member 64 made of synthetic rubber, for example. The elastic buffer member 64 is fixed at both ends to the blade body 10 by screwing a mounting bolt 66 into a boss 68 (FIG. 4) provided on the bottom surface of the blade body 10. When the connecting member 26 is rotated in this manner, the connecting member 26 comes into contact with the intermediate portion of the elastic buffer member 64.

Further, a stop piece 70 is fixed to one end of each connecting member 26 guided by the guide means 56 (see FIGS. 1, 2, and 4).
The stop piece 70 has a contact surface that comes into contact with the rear end of the bottom surface of the blade main body 10.
The contact surface 0 contacts the bottom surface of the blade main body 10 when the cutting edge support 6 is in the above-mentioned working state, and rotates the connecting member 26 in a predetermined direction (clockwise in FIGS. 4 and 6). prevent.

Furthermore, an abutting piece 72 is fixed to the lower surface of each connecting member 26 guided by the guide means 56 (see FIGS. 1, 2, and 4).
The lower surface of the abutment piece 72 has a plate main body 12 of the cutting edge support 6 when the cutting edge support 6 is rotated as described later.
The lower end of the back surface is brought into contact with the lower end of the back surface.

Furthermore, the cutting edge support 6 is provided with a plurality of reinforcing plates 74 and 76 spaced apart from each other in the width direction between the plate body 12 and the connecting rod member 28.

Next, mainly referring to FIGS. 3 to 6,
The functions and effects of the earthmoving vehicle blade 2 having the above-described configuration will be explained.

The blade 2 described above is attached to the front end of an earthmoving vehicle and is used, for example, as a snow removal blade.
During work using the blade 2 (for example, snow removal work), the forward movement of the earthmoving vehicle (arrow 7 in Fig. 6)
8), when the lower end of the cutting edge 8 disposed on the left side of the blade 2 collides with an obstacle on the ground E (Figs. 4 and 6), this Connecting rod member 28 due to collision
The cutting edge support 6 to which the cutting edge 8 is fixed about the central axis (second axis) of An impact force (moment force) is generated that causes the shear pin mechanism 4 to rotate (counterclockwise).
It acts on the second shear pin 44. If the impact force is large (or even greater than the strength of the shear pin 44), the shear pin 44 is cut by the impact force. When the shear pin 44 is cut, the notch 44a of the shear pin 44 is cut, as understood from FIGS. 3 and 5. When the shear pin 44 is cut as described above, the holding function of the cutting edge support 6 (further, the function of holding the cutting edge support 6 in the above working state) is lost, and the cutting edge support 6 is pivotable about the central axis (second axis) of the connecting rod member 28 and the central axis (first axis) of the connecting pin 24. In the illustrated example, when the cutting edge support 6 is held in the working state, the locking rod member 30 fixed to the back surface of the plate body 12 is attached to the receiving portion of the blade body 4 (formed on the plate 36). Since the contact surface of the stop piece 70 received in the recess 34 and the recess 38 formed in the plate 40 and fixed to one end of the connecting member 26 is in contact with the bottom surface of the blade body 10, the shear pin 44 When the cutting edge support 6 is cut, the cutting edge support 6 can be turned only in a predetermined direction shown by an arrow 80 (counterclockwise in FIGS. 4 and 6), and the connecting member 26 can be rotated in a direction opposite to the predetermined direction. It is possible to turn only in the direction shown by arrow 82 (clockwise in FIGS. 4 and 6).

As the earthmoving vehicle moves further forward after the holding function is lost as described above (progressing in the direction shown by arrow 78), the cutting edge support to which the cutting edge 8 is fixed, as shown by the solid line in FIG. 6 is an arrow 80 centered on the connecting rod member 28.
(counterclockwise in FIGS. 4 and 6), and due to the rotation, the connecting rod member 28 is pushed upward using the lower end of the cutting edge 8 as a fulcrum, thereby making the connection. The member 26 is moved in the direction of the arrow 82 with the connecting pin 24 as the center.
(clockwise in FIGS. 4 and 6). When the connecting member 26 is turned, the connecting member 26 is reliably turned around the connecting pin 24 because it is guided by the guide surfaces respectively defined on the pair of guide plates 85 as described above. Further, when the amount of rotation of the connecting member 26 exceeds a predetermined value, the upper surface of the connecting member 26 comes into contact with the elastic buffer member 62 as described above, and the impact caused by the connecting member 26 is buffered. Further, as the earthmoving vehicle moves forward, the connecting member 26 further pivots about the connecting pin 24 in the direction shown by the arrow 82, as shown by the two-dot chain line in FIG. Arrow 80 centering on member 28
It will be rotated in the direction shown. When the cutting edge support 6 is rotated as described above and the amount of rotation of the cutting edge support 6 exceeds a predetermined value, the plate body 12 is rotated as described above.
The lower end of the back surface of the cutting edge 8 contacts the contact piece 72 of the connecting member 26 (indicated by the two-dot chain line in FIG. 6), and the cutting edge 8 is prevented from contacting the connecting member 26.

In the above description, a case has been described in which an impact force is applied to the cutting edge 8 disposed on the left side of the blade 2. However, an impact force is applied to the cutting edge 8 disposed on the right side of the blade 2. Substantially the same effect will be obtained if it is added. In this case, the shear pin of the shear pin mechanism provided at the right end of the blade 2 is cut off.

As described above, in the blade 2 described above, when a large impact force is applied to the cutting edge 8, the shear pin 44 is cut, and the cutting edge 8 is integrally connected to the cutting edge support 6 and the connecting pin 24. Connecting rod member 2
8, the impact force can be dynamically buffered, thus preventing the blade 2 including the cutting edge 8 from being deformed or damaged in the event of a collision.

Further, in the blade 2, when the earthmoving vehicle moves further after the shear pin 44 is cut,
Because the cutting edge support 6 is pivoted about the second axis and together with the connecting member 26 about the first axis (thus, the cutting edge support 6 is pushed upward). It is also possible to buffer the impact force caused by the thrust caused by the forward movement of the earthmoving vehicle, and it is particularly advantageous for use in a type in which the blade 2 is attached to the earthmoving vehicle via a hydraulic cylinder mechanism.

In addition, in the illustrated blade 2, the cutting edge 8 and the cutting edge support 6 are
is divided into two in the width direction, and the shear pin mechanism 42 is connected between the left end of one cutting edge support 6 and the left end of the blade body 4, and between the right end of the other cutting edge support 6 and the right end of the blade main body 4. Since the shear pins 44 are disposed in between, the shear pins can be easily replaced when the shear pins 44 are broken.

[Brief explanation of the drawing]

FIG. 1 is a bottom view of the left half of an earthmoving vehicle blade constructed in accordance with the present invention. 2 is an enlarged bottom view showing the left end of the blade in FIG. 1; FIG. Third
The figure is a left side view of the blade in FIG. 1. Figure 4 shows
Sectional view taken along the - line in FIG. 2. FIG. 5 is a sectional view taken along the - line in FIG. 2. 6th
The figure is a diagram for explaining the action when an impact force is applied to the blade of FIG. 1. 2...Blade, 4...Blade body, 6...
Cutting edge support, 8... cutting edge, 24... connecting pin, 26... connecting member, 28... connecting rod member, 42... shear pin mechanism, 44... shear pin.

Claims (1)

[Scope of Claims] 1. A blade body to be mounted on an earthmoving vehicle, a cutting edge support having a cutting edge fixed to its lower end, and a cutting edge support having one end attached to the blade body so as to be rotatable about a first axis. a connecting member whose other end is pivotally connected to the cutting edge support about a second axis; and a shear pin interposed between the blade body and the cutting edge support. a shear pin mechanism that holds the cutting edge support in a working state, and when an impact is applied to the cutting edge to cause it to pivot in a predetermined direction about the second axis, the impact is If the impact force acting on the shear pin of the shear pin mechanism is large, the shear pin is severed, and the cutting edge is rotated integrally with the cutting edge support along the first axis and the second axis. A blade for an earthmoving vehicle, characterized in that it is pivoted about an axis so that the impact is dynamically buffered. 2 The cutting edge and the cutting edge support are divided into two in the width direction, and the shear pin mechanism is located between the left end of one of the cutting edge supports and the left end of the blade body and between the other cutting edge. A blade for an earthmoving vehicle according to claim 1, wherein the blade is disposed between a right end portion of the blade body and a right end portion of the blade body. 3. A locking rod member is fixed to the upper end of the rear surface of the cutting edge support, and a receiving part that is open to the front is defined at the lower end of the blade body, so that the cutting edge support can be Claim 1 or 2, wherein the locking rod member is received in the receptacle when held in this position.
Blades for earthmoving vehicles as described in section. 4 At one end of the connecting member, when the cutting edge support is in the working state, the connecting member contacts a part of the blade body and pivots in a predetermined direction about the first axis. The blade for an earthmoving vehicle according to any one of claims 1 to 3, wherein a stop piece is provided to prevent the blade from moving. 5. An elastic buffer means is provided on the bottom surface of the blade body, with which a part of the connecting member comes into contact when the connecting member is rotated about the first axis in a direction opposite to the predetermined direction. A blade for an earthmoving vehicle according to any one of claims 1 to 4. 6 A contact piece is provided on the lower surface of the connecting member, with which a portion of the cutting edge support comes into contact when the cutting edge support is rotated in the predetermined direction about the second axis. A blade for an earthmoving vehicle according to any one of claims 1 to 5.