JPS6331604B2 - - Google Patents

Description

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

<Prior Art> Generally, when removing snow 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, drivers are unable to spot snow-covered obstacles because they are covered with snow, such as curbs next to walkways, utility poles, and large stone manhole covers on the ground. Therefore, during snow removal work, a part of the blade (especially the cutting edge fixed to the blade body) that is attached to the earthmoving vehicle accidentally collides with an obstacle on the road, causing damage to the blade (especially the cutting edge). There have been many accidents that have deformed or damaged the hydraulic cylinder mechanisms of earthmoving vehicles.

Therefore, in order to eliminate the above-mentioned accidents, blades have been proposed and put into practical use in which various improvements have been made to the blade so that when a large impact is applied to the blade, this impact can be buffered. 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 against the force of the spring due to impact, but these have a large structure if the entire blade is moved. If the cutting edge is moved, there is a risk of the blade swinging during operation, and since the cutting edge is held in the working state by the action of a spring, there is a risk of the blade swinging during operation. It is difficult to resist the force and the blade may swing during operation.

<Object of the Invention> An object of the present invention is to provide a cutting edge that is capable of reliably holding the cutting edge in a working state, and also capable of reliably absorbing a large impact when it is applied to the cutting edge. An object of the present invention is to provide a blade for an earthmoving vehicle having a simple configuration.

<Summary of the invention> According to the present invention, in order to achieve the above object,
A blade body to be mounted on an earthmoving vehicle, a cutting edge support having a cutting edge fixed to the lower side thereof, and one end thereof connected to the blade body so as to be rotatable about a first axis extending laterally to the blade body. interposed between the blade body and the cutting edge support; a tension bolt mechanism that holds the cutting edge support in a working state by a tension bolt, and an impact force that causes the cutting edge to pivot in a predetermined direction about the second axis; When the impact is applied, the impact acts on the tension bolt of the tension bolt mechanism, and when the impact force from the impact is large, the tension bolt is cut and the cutting edge is connected to the cutting edge support. A blade for an earthmoving vehicle is provided, characterized in that the blade is pivoted integrally about the first axis and the second axis, and thus the impact is dynamically damped.

<Preferred Embodiments of the Invention> Hereinafter, preferred embodiments of the blade for earthmoving vehicles constructed according to the present invention will be described with reference to the accompanying drawings.

The first figure is a bottom view of a part of the blade for an earthmoving vehicle.
In the figure, the illustrated blade 2 for an earthmoving vehicle includes a blade body 4, a cutting edge support 6, and a cutting edge 8, which are attached to the front end of an earthmoving vehicle (not shown). The cutting edge support 6 and cutting edge 8 are
As can be understood from Fig. 1, the earthmoving vehicle blade 2 is divided into two parts in the lateral direction (the left-right direction in Fig. 1, the direction perpendicular to the plane of the paper in Figs. 2 to 4), and each cutting edge Cutting edges 8 are fixed to the lower ends of the supports 6 (Figure 1 shows the left half of the earthmoving vehicle blade 2, and the cutting edge support 6 and cutting edge 8 located on the left side and the cutting edge 8 on the right side are shown in Fig. 1. The cutting edge support 6 and a part of the cutting edge 8 (i.e., the left end portion) are shown. 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.

Referring further to FIGS. 2-4 in conjunction 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 body 12, and on the back side of the plate body 12, mounting brackets 18 consisting of a pair of plates 16 (in the specific example, four brackets are disposed on one plate body 12) are spaced apart. It is placed and fixed. On the other hand, a mounting bracket 22 (corresponding to the above-mentioned mounting bracket 18) is provided at the rear end of the bottom surface of the blade main body 10 of the blade main body 4.
(4 pieces are provided on the left half of the board) are fixed at intervals. Each of these mounting brackets 22
One end of a connecting member 26 is rotatably connected between the plates 20 via connecting pins 24, respectively. The other end of the connecting member 26 is pivotally connected between the plates 16 of the mounting bracket 18 via a laterally extending connecting rod 28. A connecting rod 28 is fixed to an end plate 27 with one end fixed to the inner end of the plate body;
The other end is fixed to the plate 16 located on the outside of the mounting bracket 18 disposed at the left end (therefore, the right end in FIG. 1), and the intermediate part is disposed at the intermediate part of the plate body 12 It extends laterally through plate 16 of mounting bracket 18. In the illustrated example, as shown in FIGS. 2 and 3, an opening 29 is formed in a portion of the plate body 12 so that the plate body 12 can freely pivot relative to the connecting member 26. . As described above, the cutting edge support 6 rotates with respect to the blade body 4 together with the connecting member 26 about the central axis of the connecting pin 24 (constituting the first axis extending in the lateral direction). and is pivotable relative to the connecting member 26 about the central axis of the connecting rod 28 (which constitutes a second laterally extending axis) (see also FIG. 5).

A laterally extending locking rod 30 is further fixed to the upper end of the rear surface of the plate body 12 of the cutting edge support 6 described above. To further explain, the illustrated locking rod 30 is composed of two rod members, one end of which is fixed to the end plate 27 of the plate body 12.
The other end is fixed to a mounting block 46 (described later) fixed to the plate body 12, and the middle part thereof is fixed to the upper end of the back surface of the plate body 12 and the upper end of the plate 16 of the mounting bracket 18.
The other rod member has one end fixed to the mounting block 46 (described later), the other end fixed to the upper end of the plate 16 located outside the mounting bracket 18 disposed at the left end, and is fixed to the upper end of the back surface of the plate body 12 and to the upper end of the plate 16 of the mounting bracket 18. As such, the locking rod 30 of the rod member extends laterally across substantially the entire width of the plate body 12. On the other hand, the blade body 4
At its lower end, receivers are defined at laterally spaced intervals in which the locking rods 30 are received. In a specific example, a space is provided in the lateral direction at the front of the bottom surface of the blade main body 10 of the blade main body 4 in the longitudinal direction (in the vertical direction in FIG. 1, in the direction perpendicular to the plane of the paper in FIGS. 2 to 4). Place and receive member 3
2 (as shown in FIG. 1, four are provided on the left half of the blade main body 10) are fixed.
The three receiving members 32 (excluding the receiving member 32 disposed at the left end of the plate body 12) are composed of a pair of plates 36, and correspond to each mounting bracket 22 except for the mounting bracket 22 located on the outside. and are arranged on both sides of the pair of plates 20. The remaining receiving member 32 is composed of a single plate 37, and is disposed at the left end of the plate body 12 in correspondence with the mounting bracket 18 located at the left end. As shown in FIGS. 2 and 3, each of the plates 36 and 37 has a recess 38 defining a receiving portion that is open to the front.

In connection with the locking rod 30 fixed to the plate body 12 and the receiving portion defined in the blade body 4, there is a gap between the blade body 4 and the cutting edge support 6 as shown in FIGS. 1 and 4. As shown, a tension bolt mechanism 42 is interposed. Although the tension bolt mechanism 42 may be disposed at the end of the cutting edge support 6, it is preferably disposed approximately at the center in the lateral direction of the plate body 12 of the cutting edge support 6 as shown. Referring to FIG. 4, the tension bolt mechanism 42 includes a tension bolt 44, and a shaft portion 44a of the tension bolt 44 has a V-shaped notch 44b formed around it. This tension bolt 44 is interposed between the blade body 4 and the cutting edge support 6, and holds the cutting edge support 6 in the working condition shown in FIGS. 1 to 4. To explain further, a mounting block 46 is fixed to the upper end of the back surface of the plate body 12 at approximately the center in the lateral direction, and a through hole 48 is formed in the mounting block 46. The rear upper end of the mounting block 46 is formed in an arc shape. Further, a mounting block 50 is fixed to the bottom surface of the blade main body 10, and this mounting block 5
A through hole 52 is also formed in 0. The tension bolt 44 described above is attached to the mounting block 4.
6 through hole 48 and through hole 5 in mounting block 50
2 and screwing a nut 56 through a washer 54 to a male threaded portion formed at one end of the shaft portion 44a as required. As such, the cutting edge support 6 is held in the working state by the tension bolt 44 of the tension bolt mechanism 42, the connecting rod 28, the connecting member 26 and the connecting pin 24. In such a working state, as is clear from FIG. 3, the plate main body 12
A locking rod 30 fixed to the back side of the blade body 4 is connected to the receiving portions defined in the blade body 4, that is, the plates 36 and 3.
It is received in a recess 38 formed in 7, thus ensuring that the cutting edge support 6 is held in the above-mentioned working condition. As shown in FIG. 4, the tension bolt 44 is arranged so that its axis is substantially perpendicular to the direction in which the cutting edge support 6 is rotated about the connecting rod 28 in the working state. Preferably, it is attached.

The cutting edge 8 is fixed to the cutting edge support 6 attached to the blade body 4 as described above. Referring to FIGS. 1, 2, and 3, a plurality of holes are formed at the lower end of the plate body 12 of the cutting edge support 6 at intervals in the lateral direction; A plurality of holes are formed at intervals in the width direction in the middle part of the cutting edge 8 in the vertical direction, and the cutting edge 8 is attached to the main body by a plow bolt 58 and a nut 60 that are fitted through these holes. It is fixed to the lower end of the front surface of 12. and,
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 62 is further provided on the bottom surface of the blade body 10 (see FIGS. 1 and 1). (See Figure 3). The guide means 62 is disposed corresponding to each connecting member 26 other than the connecting member 26 located on the outside, and is arranged in correspondence with the connecting member 26 located outside the blade body 10.
It has a pair of guide plates 64 hanging downward from the bottom surface of the. This pair of guide plates 6
4 are arranged on both sides of the connecting member 26. Therefore, the guide means 62 guides the connecting member 26 when it is pivoted, as will be described later.

Further, an elastic buffer means 66 is provided on the bottom surface of the blade main body 10 (see FIGS. 1 and 3). The elastic buffer means 66 is disposed corresponding to the connecting member 26 guided by the guide means 62, and includes an elastic buffer means 68 made of, for example, synthetic rubber. The elastic buffer means 68 is attached to the mounting bolt 70
is fixed to the blade body 10 at both ends by being screwed onto a boss 72 (FIG. 4) provided on the bottom surface of the blade body 10, and the connecting member 26 is fixed to the blade body 10 as described later. When pivoted, the connecting member 26 abuts the intermediate portion of the elastic buffer member 68.

Further, a stop piece 74 is fixed to one end of each connecting member 26 guided by the guide means 62 (see FIGS. 1 and 3). Stop piece 7
4 has a contact surface that comes into contact with the rear end of the bottom surface of the blade main body 10, and the contact surface of the stop piece 74 contacts the blade main body 10 when the cutting edge support 6 is in the above working state. The connecting member 26 is prevented from turning in a predetermined direction (counterclockwise in FIGS. 2 to 4).

Furthermore, an abutting piece 76 is fixed to the lower surface of each connecting member 26 guided by the guide means 62 (see FIGS. 1, 3, and 4).
The lower surface of the abutting piece 76 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.

Next, mainly referring to FIGS. 3 to 5,
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 (not shown) and is used, for example, as a snow removal blade. During work using the blade 2 (for example, snow removal work), the earth moving vehicle is moved forward (progressing in the direction shown by arrow 78 in FIGS. 3 to 5), and the blade 2 is disposed on the left side of the blade 2. When the lower end of the cutting edge 8 collides with an obstacle on the ground E (FIGS. 2 to 5), the collision causes the cutting edge 8 to be cut around the central axis (second axis) of the connecting rod member 28. The cutting edge support 6 to which the cutting edge 8 is fixed is indicated by the arrow 80.
An impact force (moment force) is generated that causes the tension bolt mechanism to rotate in a predetermined direction (counterclockwise in Figures 3 to 5) as shown in Figures 3 to 5. 42 tension bolts 44. Then, the impact force acting on the tension bolt 44 is large (for details, see
When the impact force is greater than the strength of the tension bolt 44, the tension bolt 44 is cut by the impact force. In the illustrated embodiment, since the tension bolt 44 is mounted so that its axis is substantially perpendicular to the direction of rotation of the cutting edge 6 in the working state, the impact force is applied to the tension bolt 44. This acts as a tensile force that pulls the bolt 44 in the axial direction, and the tension bolt 44 is cut by this tensile force.
When the tension bolt 44 is cut, the notch 44b of the tension bolt 44 is cut, as is easily understood.

When the tension bolt 44 is cut as described above, the holding function of the cutting edge support 6 (more specifically, the holding function of the cutting edge support 6
function to maintain the above working state) is lost,
The cutting edge support 6 is connected to the central axis (second axis) of the connecting rod member 28 and the connecting pin 24.
It is possible to freely turn around the central axis (first axis) of the. In the illustrated example, when the cutting edge support 6 is held in the working state, the locking rod 30 fixed to the back surface of the plate body 12 engages with the receiving part of the blade body 4 (the plate 36
Since the contact surface of the stop piece 74, which is received in the recess 38) formed in and 37 and fixed to one end of the connecting member 26, is in contact with the bottom surface of the blade main body 10, the tension bolt 44 is cut. Then, the cutting edge support 6 can be turned only in a predetermined direction shown by an arrow 80 (counterclockwise in FIGS. 3 to 5), and the connecting member 26 can be turned in a direction opposite to the predetermined direction. It is possible to turn only in the direction indicated by 82 (clockwise in FIGS. 3 to 5).

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 pivoted around the connecting rod 28 in the direction shown by an arrow 80 (counterclockwise in FIGS. 3 to 5), and due to the pivoting, the connecting member 26 uses the lower end of the cutting edge 8 as a fulcrum. By being pushed upward as
4 in the direction shown by arrow 82 (clockwise in FIGS. 3 to 5). When the connecting member 26 is pivoted, the connecting member 26 is guided by a pair of guide plates 64. When the connecting member 26 is rotated in this manner and 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 means 62, and the impact caused by the connecting member 26 is thus buffered.

Further, as the earthmoving vehicle moves forward, the connecting member 26 is further turned around the connecting pin 24 in the direction shown by the arrow 82, as shown by the two-dot chain line in FIG. It is pivoted about member 28 in the direction shown by arrow 80. 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 lower end of the back surface of the plate body 12 is connected to the connecting member 2.
6 (in the state shown by the two-dot chain line in FIG. 5), the tip of the cutting edge 8 is prevented from coming into contact with 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 tension bolt of the tension bolt mechanism provided at the right end of the blade 2 is cut.

In the blade 2, as is easily understood, by preparing several types of tension bolts with different strengths, the set load to be cut by the impact force can be changed as appropriate.

As described above, in the blade 2 described above, when a large impact force is applied to the cutting edge 8, the tension bolt 44 is cut, and the cutting edge 8 is integrally connected to the cutting support 6 and connected to the connecting pin 24 and the connecting rod. 28, the impact force can be dynamically buffered, thereby 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 tension bolt 44 is cut, the cutting edge support 6 is rotated around the second axis, and the connecting member is rotated around the first axis. 26 (thus, the cutting edge support 6 is pushed upward), the impact force caused by the thrust accompanying the forward movement of the earthmoving vehicle can also be buffered. It can be conveniently applied to a type that is attached to an earthmoving vehicle.

Further, in the blade 2, the cutting edge support 6 is restrained in the working state by the tightening force of the tension bolt 44 of the tension bolt mechanism 42 and the nut 56. The blade body 4 and the cutting edge support 6 can be held in this position reliably, and generation of so-called backlash between the blade body 4 and the cutting edge support 6 can be prevented.

Further, since the tension bolt mechanism 42 is employed, it is possible to easily replace the tension bolt 44 when it is cut.

Furthermore, in the illustrated blade 2, since the tension bolt mechanism 42 is disposed approximately in the center of the plate body 12 in the lateral direction, even if an impact is applied to the end of the cutting edge 8, the plate body 12 The tension bolt 4 reliably absorbs the impact force by reducing the absorption of impact force due to the torsional action of the tension bolt 4.
4, thereby making it possible to reduce the strength of the cutting edge support 6.

Although specific examples of the earthmoving vehicle blade configured according to the present invention have been described above, the present invention is not limited to such specific examples, and various changes and modifications can be made without departing from the scope of the present invention. is possible.

For example, in the illustrated embodiment, the cutting edge support and the cutting edge are
Although they are divided, they may be divided laterally into three or more parts if desired, or the desired effect can be achieved without any division.

[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. FIG. 2 is a left side view of the blade in FIG. 1. FIG. 3 is a sectional view taken along the - line in FIG. 1. FIG. 4 is a sectional view taken along the - line in FIG. 1. Figure 5 shows the first
A diagram for explaining the effect when an impact force is applied to the blade shown in the figure. 2... Blade for earthmoving vehicle, 4... Blade body, 6... Cutting edge support, 8...
Cutting edge, 10...blade body,
12... Plate body, 24... Connection pin, 26
... Connection member, 28 ... Connection rod, 42 ... Tension bolt mechanism, 44 ... Tension bolt.

Claims (1)

[Scope of Claims] 1. A blade body mounted on an earthmoving vehicle, a cutting edge support having a cutting edge fixed to the lower end thereof, and one end thereof centered on a first axis extending laterally to the blade body. a connecting member that is rotatably connected to the blade body and the cutting edge support, the other end of which is rotatably connected to the cutting edge support about a second axis extending in the lateral direction; a tension bolt mechanism for holding the cutting edge support in a working state by a tension bolt interposed therebetween; When a sudden impact is applied, the impact acts on the tension bolt of the tension bolt mechanism, and when the impact force from the impact is large, the tension bolt is cut and the cutting edge is A blade for an earthmoving vehicle, characterized in that the blade is pivoted integrally with a cutting edge support about the first axis and the second axis, so that the impact is dynamically damped. 2. The cutting edge and the cutting edge support are divided into at least two parts in the lateral direction, and the tension bolt mechanism is interposed between each cutting edge support and the support body. The blade for earthmoving vehicles as described in item 1. 3. The blade for an earthmoving vehicle according to claim 2, wherein the tension bolt mechanism is disposed approximately in the lateral center of each cutting edge support. 4. The tension bolt is mounted such that its axis is substantially perpendicular to the direction of rotation of the cutting support about the second axis in the working state. A blade for an earthmoving vehicle according to any one of items 1 to 3. 5. A locking rod extending in the lateral direction is provided at the upper end of the back surface of the cutting edge support, while a receiving portion open to the front is provided at the lower end of the blade body and spaced apart in the lateral direction. wherein the locking rod is received in the receptacle when the cutting support is held in the working condition;
A blade for an earthmoving vehicle according to any one of claims 1 to 4.