JPS6242964Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a plow safety device that reverses the cutting edge of a plow provided at the bottom end of the plow body to avoid impact with an obstacle such as a curb during snow removal work.

Generally, there are two types of safety devices, a shear pin type and a spring type, for preventing a plow from being damaged by impact from an obstacle. The shear pin type plow safety device connects the plow body and the cutting edge by inserting a shear pin. When this cutting edge receives an impact from an obstacle, the shear pin is cut and the cutting edge is reversed to prevent damage. However, each time the shear pin is cut, it is necessary to interrupt the work and keep the shear pin on hand as a spare part, which hinders snow removal work in order to replace it. In addition, the operator had no choice but to rely on his intuition to determine whether the shear pin had broken. Next, Fig. 1 is a schematic diagram of this type of spring-type plow safety device, Fig. 2 is a side view of Fig. 1, Fig. 3 is a diagram of the main part of the link mechanism, and A is its front view. , B is a side view thereof, and FIG. 4 is an explanatory diagram of the operation of the link mechanism. In FIGS. 1 to 4, the plow safety device 1 mainly includes two sets of cutting edge locking mechanisms 2 and two sets of link mechanisms 3. The cutting edge locking mechanism 2 includes a lock lever 8 that is pivotally supported by a rotation shaft 7 and a cutting edge 9 attached to a hinge box 6 fixed to the back surface of the plow body 5 using fixing devices, that is, bolts 10 and nuts. an edge holder 12 fixed at 11;
A hinge box 6 is provided at the upper end of the edge arm 13 fixed to the back surface of the edge holder 12.
and a pivot support 15 rotatably supported by a pivot shaft 14. A notch groove 16 is provided on the outer peripheral surface of this shaft support 15, and a projection piece 17 provided at one end of the lock lever 8 locks the notch groove 16.
The edge holder 12 is held at the lower end of the plow body 5.

The link mechanism 3 includes a support frame 19 , a link lever 20 on which a pivot support 28 is rotatably supported by a rotation shaft 21 on the support frame 19 , and a link lever 20 having one end pivoted to the other pivot support 29 of the link lever 20 . axis 2
2, and as shown in FIG. 2, a support lever 23 is rotatably supported by It consists of a plurality of tensioned elastic members, four coil springs 27 in this embodiment. A through shaft 37 passing through the other end of the support lever 23 is connected to the lock lever 8 as shown in FIG.
It is fitted into a V-shaped groove 38 provided at the other end, transmits the compressive force of the coil spring 27 to the lock lever 8, and applies a pressing force in the direction of the arrow P to the protruding piece 17 of the lock lever 8. It is given to the notch groove 16 of. 9A is the inverted state of the edge 9, 8A is the rotating state of the lock lever 8, 22A is the rotating state of the rotating shaft 22, 24A is the rotating state of the support shaft 24, 23A is the rotating state of the support lever 23, 27A is the rotating state of the support lever 23.
shows the expanded state of the coil spring 27. Furthermore, as shown in FIG. 3, the support shaft 24 is provided with four grooves 39, each of which suspends a coil spring 27. Furthermore, 40 is a spacer inserted between the link lever 20 and the support lever 23, and 35 is a plow end confirmation rod for checking the left end of the plow body 5.

With the above-described configuration, the edge holder 12 is moved from the shaft support 15 by the impact of the edge 9 from an obstacle such as a curb.
The protruding piece 1 of the lock lever 8 with respect to the notch groove 16 of
7 in the arrow direction P, resisting the pressing force in the arrow direction P.
is rotated. Due to this rotation, the projection piece 17 is pushed out from the notch groove 16 to the outer circumferential surface of the shaft support 15. Therefore, the lock lever 8 rotates in the direction R of the arrow about the rotation shaft 7, and the support lever 23 rotates around the rotation shaft 3.
7 is pressed down. When the support lever 23 is pressed down, the link lever 20 rotates about the rotation shaft 21, and the support shaft 24 reaches the support shaft 24A while extending the coil spring 27. At this time, as shown in FIG. 4, the center line XX direction of the coil spring 27 is displaced in the center line X ₁ -X ₁ direction, and intersects the straight line YY connecting the shaft supports 21 and 22A. That is, since the spring 27 moves beyond the shaft support 22A (top dead center) by the rotation of the support shaft 24, the tension of the spring 27 is mainly supported by the rotation shaft 21. Therefore, although the reversal of edge 9 progresses to avoid the obstacle,
The outer edge of the shaft support 15 only rotates while contacting the protrusion piece 17. Therefore, the return force of the spring 27 does not increase further and remains at a predetermined return force. Next, in order to return this edge 9A, apply an external force in the opposite direction to the reversal direction Q and rotate the notch groove 16 to the position of the protrusion piece 17.
The restoring force of the spring 27 acts instantaneously, so that the cutout groove 16 is engaged with the projection piece 17, and the edge 9 is held at the lower end of the plow body 5. Therefore, such a spring type plow safety device 1 is easier to handle than a shear pin type plow safety device. However, as with the shear pin type, the fact that the edge 9 was reversed had to rely on the intuition of the operator. However, it has been difficult for operators to detect it quickly and reliably.

In view of the above points, it is an object of the present invention to provide a blade tip reversal confirmation device that eliminates the drawbacks of the prior art, has a simple configuration, and can quickly and reliably confirm that the blade tip has been reversed. purpose.

According to the present invention, this purpose is achieved by an edge reversal detection protrusion provided on the link mechanism and an edge reversal display means provided on the plow body that is capable of detecting and displaying the rotation of the edge reversal detection protrusion. This is achieved by providing

According to an embodiment of the present invention, the edge reversal display means is provided with a display return mechanism to automatically display that the edge has returned to the lower end of the plow body.

Next, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 5 is a schematic configuration diagram of an embodiment of the present invention, and FIG.
The figure shows an explanatory diagram of the operation of the edge reversal confirmation device shown in FIG. In FIGS. 5 and 6, parts having the same functions as those in FIGS. 1 and 4 are given the same reference numerals. The edge reversal confirmation device 4 includes a fan-shaped edge reversal detection protrusion (fan-shaped protrusion) 30 fixed to the outer peripheral surface of a shaft support 28 provided on the link lever 20 of the link mechanism 3, an edge reversal display means, and an edge reversal display means. Here, an L-shaped lever 31 provided on the support frame 19 to detect rotation of the fan-shaped protrusion 30 and a flexible wire 3 provided on the plow body 5 are shown.
2, an edge reversal display bar 33, and the like. Further, 30A is the rotating state of the fan-shaped protrusion produced by reversing the edge 9, and 31A is the rotating state of the L-shaped lever at this time. The edge locking mechanism 2 has a shaft support 15 that rotatably connects the plow body 5 and the edge 9, and has a projection piece 17 and a notch so as to hold the edge 9 at the lower end of the plow body 5. Groove 16
It is locked by. The link mechanism 3 has one end of the support lever 23 engaged with one end of the lock lever 8 of the edge locking mechanism 2, and a shaft body 24, which is the other end of the link lever 20, and a support metal fitting provided on the plow body 5. A coil spring 27 is tensioned between the coil spring 26 and the coil spring 26. Due to the impact of the obstacle, the locking state between the plow body 5 and the edge 9 in the edge locking mechanism 2 is released against the elasticity of the coil spring 27, and the edge 9 is reversed.

Due to this unlocked state, the rotational state that occurs in the link mechanism 3 is detected as the rotational position 30A of the fan-shaped protrusion 30 fixed to the shaft support 28 of the link lever 20. The outer edge 42 of this fan-shaped protrusion 30 is smoothly finished, and one end of the L-shaped lever 31 is attached to the outer edge 42.
It is formed so that it can rotate along. The edge reversal display bar 33 includes a display bar body 43, a display bar end portion 44 rotatably supported by a rotation shaft 36 at the tip of the display bar body 43, a display bar body 43, and a display bar end portion 44. In this embodiment, the display return member provided between the
It also serves as the plow left end confirmation rod 35 shown in the figure. Further, 31A shows the state of the L-shaped lever when the edge 9 is reversed, and 44A shows the state of the end of the display bar when the edge 9 is reversed.

As shown in FIG. 6, when edge 9 is reversed, L
One end of the letter-shaped lever 31 is connected to the outer edge 42 of the fan-shaped projection 30.
It rotates while contacting and reaches the fan-shaped protrusion 30A, but while maintaining the contact state, it reaches the L-shaped lever 31A shown by the chain line. Depending on the state of the lever 31A, the display rod end 44 is rotated to the display rod end 44A shown by the chain line through the flexible wire 32 against the spring 41, thereby displaying the reversal of the edge 9. Also, when the edge 9 returns, the fan-shaped protrusion 3
The state returns to the fan-shaped protrusion 30 state from 0A. At this time, one end of the L-shaped lever 31 is not pressed by the fan-shaped protrusion 30. Therefore, the return force of the spring 41 returns the indicator rod end 44A to the indicator rod end 44, and the L
The L-shaped lever 31A is returned to the L-shaped lever 31.

As described above, according to the present invention, there is provided an edge holding mechanism that rotatably connects the plow body and the edge and holds the edge at the lower end of the plow body; A safety device having a link mechanism for releasing the holding between the main body and the edge and reversing the edge is provided with an edge reversal detection protrusion and an edge reversal display means capable of detecting and displaying rotation of the protrusion. The present invention has the following advantages: edge reversal can be easily confirmed, the structure is robust, the handling is easy, and the display is reliable.

Although the embodiment of the present invention will be described with reference to an edge reversal confirmation device having a mechanical configuration, the present invention is not limited to this, but may include an electrical edge reversal detection device provided opposite to an edge reversal detection protrusion. means,
For example, it is easy to combine it with a limit switch and display means.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the spring-type plow safety device, Figure 2 is a side view of Figure 1, and Figure 3 is a diagram of the main parts of the link mechanism, with A being a front view and B being a side view. , FIG. 4 is an explanatory diagram of the operation of the link mechanism,
FIG. 5 is a schematic diagram of an embodiment of the present invention, and FIG. 6 is an explanatory diagram of the operation of the edge reversal confirmation device of FIG. 1: Spring type plow safety device, 2: Edge locking mechanism, 3: Link mechanism, 4: Edge reversal confirmation device, 8: Lock lever, 9: Edge, 20: Link lever, 27: Coil spring, 30: Fan-shaped protrusion, 31: L-shaped lever, 33: Edge reversal display bar.

Claims (1)

[Claims for Utility Model Registration] (1) A blade tip locking mechanism that rotatably connects the plow body and the blade tip and locks the blade tip to the lower end of the plow body; , provided on the plow body, one end of which is engaged with one end of the blade tip locking mechanism, and the other end of which suspends an elastic member between the plow body and the blade tip locking mechanism due to the impact of an obstacle. a rotatable link mechanism that releases the engagement between the plow body and the blade edge against the elasticity of the elastic member and reverses the blade edge; A blade tip reversal confirmation device comprising a protrusion and a blade tip reversal display means that is provided on the plow body and is capable of detecting and displaying rotation of the blade tip reversal detection protrusion. (2) In the statement of claim 1 of the utility model registration claim, the blade tip reversal display means is characterized by having a display return mechanism to automatically display that the blade tip has returned to the lower end of the plow body. Blade tip reversal confirmation device.