JP2008239118A - Snow plough cover opening/closing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a snow plough cover opening/closing device capable of reducing noise, adopting a mechanism opened/closed by using a minimal drive device, reducing the number of components and simplifying operation. <P>SOLUTION: An upper edge part of each main cover 2 is mounted along an outer edge part of each upper face 51b of a snow plough 51 to be deployed via a hinge member 4, and an air cylinder device 5 is installed so that a piston rod 5a facing forwards advances/retracts in the backward and forward direction. A bending part of each "V-shaped" link arm 12 is horizontally rotatably supported on a front end part of each upper face 51b of the snow plough 51. One end of each link arm 12 is supported and connected to the front end part of the piston rod 5a. A slide bracket 7 is slidably arranged in each direction orthogonal to an approximately intermediate position in the longitudinal direction of the snow plough 51. A tip of each slide bracket 7 is connected to each main cover 2 so that each main cover 2 is vertically deployed due to the advancement/retraction, and the other end of each link arm 12 is supported and connected to each slide bracket 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  Cover both sides of the snowplow for snow removal provided near the front edge of the bottom of the body of the leading vehicle in high-speed railway vehicles such as the Shinkansen running in cold regions such as the Tohoku region with covers except during snow removal. The present invention relates to a snow plow cover opening / closing device that can be opened to expose both sides of the snow plow.

For example, for a Shinkansen running in a cold region, a snow plow having a snow removal function formed of steel, aluminum alloy, FRP, or the like, behind the coupler of the leading vehicle, below the body frame and in front of the obstacle device. Is attached. However, in a railway vehicle that travels at a high speed, when the snow plow is exposed, noise is generated during traveling, air resistance during traveling (running resistance) increases, and the appearance is poor. .

Therefore, the portion of the vehicle body that covers the snow plow is configured as a movable cover that is separated from the side structure, and this movable cover is connected to the side structure via a link member so that it can be raised and lowered. There has been proposed a snow plow cover opening / closing device configured to selectively take one of a lowered position covering the snow and a raised position where the snow plow is exposed (see, for example, Patent Document 1).
JP 2005-221740 A (paragraphs 0012 to 0015, 0017 to 0019, 0036 and FIG. 3)

  However, in the snow plow cover opening / closing device described in Patent Document 1, the cover that covers the snow plow is a movable cover that is separated from the side structure, but is connected to the side structure through a link member so as to be movable up and down. And that the actuator is configured to selectively take one of a lowered position that covers the snow plow by the actuator and a raised position that exposes the snow plow. Since no structure is disclosed, it is difficult to implement.

  In addition, if there is a space around the snow plow to accommodate the snow plow cover by sliding it in the vertical direction or inside the outer shell of the vehicle, it is possible to use the slide method. Cannot be adopted if the space is large and there is not enough room.

  The present invention has been made in view of the above-mentioned points. 1) Covering a large uneven portion on both sides of the snow plow causing noise, and 2) Opening and closing the cover with a minimum driving device. Adopting a mechanism to reduce the number of parts and simplifying the operation, and 3) integrating the openable cover and its drive unit into the snow plow and its support device in an integrated manner to save space, 4) A snow plow cover that can be implemented by implementing the cover structure that covers or exposes the snow plow and the structure of the drive device that opens and closes the cover. It is intended to provide a switchgear.

In order to achieve the above object, a snow plow cover opening / closing device according to the present invention is a pair of opening / closing types that covers both side surfaces of a substantially V-shaped snow plow fixed to a front vehicle body bottom front end of a leading vehicle via a support device. Each cover is formed from a substantially plate-like body extending in parallel with each side surface of the snow plow, and a plurality of hinge members are provided with an upper end edge of each cover along each upper outer edge portion of the snow plow. The cylinder device is installed in the vehicle width direction central portion on the support device so that the forward piston rod advances and retreats in the front-rear direction. On each upper surface of the snow plow or on the front end portion of the supporting plate material fixed on the upper surface, the refracting portion of the "<"-shaped link arm is pivotally supported so as to be horizontally rotatable, and the front end portion of the piston rod is One end of each link arm is pivotally connected, and a slide bracket is slidably arranged in a direction orthogonal to each side surface of the snow plow at a substantially intermediate position in the longitudinal direction of each side of the snow plow, The front end of each slide bracket is connected to each cover so that each cover expands in the vertical direction as the slide bracket advances and retreats via a connecting member, and the other end of each link arm is pivotally connected to each slide bracket. It is characterized by that.

  According to the snow plow cover opening / closing device having the above-described configuration, the cover that covers both sides of the snow plow is attached to each side of the snow plow with a hinge member so as to be openable and closable, and the cover on both sides is mounted with the cylinder device provided on the support device. Since it opens and closes all at once, the number of parts is small and a minimum (one) cylinder device is required, and the structure is simplified.

Further, when the snow plow is in the open state (when exposed), the covers on both sides are held almost horizontally on both sides of the snow plow, so that a space for storing the cover around the snow plow is unnecessary and space saving can be achieved. Furthermore, all the components such as the cover on both sides, the hinge member, the cylinder device for opening and closing the cover, and the link arm and slide bracket, which are related parts, are provided in the snow plow (including its support device). It is not necessary to adjust the dimensions with the side structure (vehicle outer shell), and it is possible to perform attachment work and adjustment work separately from the vehicle body, thereby simplifying the work.

  A pair of auxiliary covers separately from each of the openable and closable covers according to claim 2, wherein a part of the auxiliary cover is provided above the rear end of each cover via a hinge member at the rear end of each upper surface of the snow plow. The base end of the cylinder device for deploying each auxiliary cover is suspended from the vehicle body frame. It is characterized in that it is connected to the support member provided so as to be rotatable in the vertical direction, the tip end portion of the piston rod is inclined upward in the lateral direction, and is pivotally connected to the substantially intermediate position in the vertical direction of the inner surface of each auxiliary cover.

  A pair of auxiliary covers having a substantially L-shaped cross section are overlapped with a rear end portion of the upper surface of each side of the snow plow via a hinge member, and a part of the auxiliary cover is placed on the upper rear end portion of each open / close cover in a downwardly closed state. Mounted so that the upper surface of each side of the snow plow can be unfolded substantially horizontally, and the cylinder device base end portion for deploying each auxiliary cover is vertically mounted on a support member suspended from the vehicle body frame. The piston rod tip can be tilted sideways upward, and can be pivotally connected to a substantially intermediate position in the vertical direction inside each auxiliary cover.

  If comprised in this way, when the both sides | sides of a snow plow are not linear form, for example, when it sees from the upper part, it will become possible to cover including the curved location.

  A pair of lock pin receivers are provided on one side surface of each slide bracket so as to be able to move forward and backward integrally with each other, with the open / close cover closed with respect to the lock pin receiver. It is preferable that a locking cylinder device provided with a lock pin which can be selectively inserted in the open state and the open state is provided on the upper surface of the snow plow or on a support plate material fixed on the upper surface.

If constituted in this way, the lock pin can be inserted into the lock pin receiver by the cylinder device for locking in both the closed state and the open state of the open / close covers on both sides, and can be securely fixed. The cover does not close or open carelessly.

  Since the snow plow cover opening / closing device according to the present invention has the above-described configuration, it has the following excellent effects.

That is, during normal running, which is during non-snow draining that does not require snow plows, it is possible to reduce noise generated by high speed running and reduce running resistance. In addition, all the members that make up the cover opening and closing device can be installed on a snow plow (including its support device), so there is no need to adjust the dimensions of the vehicle body or the side structure as its outer shell, and installation work And simplification of operations such as dimension adjustment, and space saving of the entire apparatus can be achieved. In addition, a snow plow cover is supported on the snow plow by a hinge member so that it can be opened and closed, and a mechanism that opens and closes with a minimum (one) cylinder device is adopted, reducing the number of parts and simplifying the operation. Since the cover is in the open state, it takes a posture that extends almost horizontally outward on both sides of the snow plow, so it occupies less space than the method of storing and opening the cover in the car body (side structure). Even if there is not enough room around the snow plow, it can be applied.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a snow plow cover opening / closing device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a front end portion of a leading vehicle equipped with a snow plow cover opening / closing device according to an embodiment of the present invention, and FIGS. 2 and 3 are perspective views showing the snow plow cover opening / closing device of the present embodiment. 2 represents a closed state of the cover, and FIG. 3 represents an opened state of the cover. FIG. 4 is a plan view showing the snow plow cover opening / closing device according to this embodiment, and the right half is omitted. 5A is a cross-sectional view taken along line AA in FIG. 4, FIG. 5B is a cross-sectional view taken along line BB in FIG. 4, FIG. 5C is a cross-sectional view taken along line CC in FIG. FIG. 6E is a cross-sectional view taken along line EE in FIG. 4, FIG. 6F is a cross-sectional view taken along line FF in FIG. 4, FIG. 6G is a cross-sectional view taken along line LL in FIG. 4 is a sectional view taken along line MM. 7A is a sectional view taken along line GG in FIG. 4, FIG. 7B is a sectional view taken along line HH in FIG. 4, FIG. 7C is a sectional view taken along line JJ in FIG. It is K sectional drawing. 8 is a pneumatic circuit diagram of the snow plow cover opening / closing device according to the present embodiment, FIGS. 9 and 10 are control flow diagrams of the snow plow cover opening / closing device, FIG. 9 shows when the cover is opened, and FIG. 10 is when the cover is closed. Represents.

  As shown in FIG. 1, in this embodiment, near the vehicle body bottom front end of a leading vehicle 1 for a high-speed railway vehicle such as a Shinkansen, snow is removed when it snows, and damage to the vehicle body is prevented when it collides with an obstacle. Therefore, a snow plow 51 having a substantially V shape in plan view is attached via a support device 52. The support device 52 is supported by a plurality of support members 53 from the vehicle body frame 1a. The snow plow cover opening / closing device 10 includes a main cover 2 and an auxiliary cover 3 on the left and right sides as shown in FIGS. 2 and 3, respectively. The main cover 2 extends from the front to the rear of both side surfaces 51a of the snow plow 51. The auxiliary cover 3 is configured to cover the rear portions of both side surfaces 51a of the snow plow 51 so as to be openable and closable. Reference numeral 1b in FIG. 1 denotes an outer shell of the vehicle, 1c denotes a combined cover, 55 denotes a wheel, and 56 denotes a rail (track).

4 to 7, each main cover 2 is formed from a substantially plate-like body extending in parallel with each side surface 51a of the snow plow 51, and the upper end of the main cover 2 is the outer edge of the snow plow upper surface 51b. Can be expanded vertically between a downward (vertical direction) closed state (see FIG. 2) and a laterally (horizontal direction) open state (see FIG. 3) via a plurality of (six) hinge members 4 It is attached. As shown in FIGS. 5C, 6D, 6F, G, and H, the cross-sectional shape of the main cover 2 is a substantially plate-like body, and the upper end portion is curved outwardly, and the longitudinal direction. Are provided with two ribs 2a and 2b projecting inwardly, the main body 4a side of the hinge member 4 being attached at regular intervals along the longitudinal direction of the snow plow upper surface 51b, and the other hinge portion 4b being the main cover It attaches to the upper end part of the inner surface 2b, and is comprised so that it may expand | deploy centering on the hinge pin 4c.

  On the connecting plate 54 (see FIGS. 4 and 5A) of the left and right support devices 52, an air cylinder device 5 for simultaneously opening and closing the left and right main covers 2 is installed with the piston rod 5a facing forward. The base end of the Y-shaped joint 5b is connected to the tip of the piston rod 5a by a pin 5c. In addition, the LM guide 6 is installed in a direction orthogonal to the substantially middle position in the length direction of the snow plow upper surface 51b, and the slide bracket 7 is slidably disposed on the LM guide 6. A base end portion of a connecting rod 8 as a connecting member is pivotally attached to the slide bracket 7 with a pin 8a, and a tip end portion of the connecting rod 8 is attached to an upper end portion of a hinge stay 9 attached to an upper end portion of the inner surface 2b of the main cover. Are connected. With this configuration, as shown in FIG. 6E, the slide bracket 7 moves backward along the LM guide 6 so that the main cover 2 is expanded upward from the closed state in the vertical posture and is in the open state in the horizontal posture. . On the other hand, when the slide bracket 7 moves forward from the open state, it returns to the closed state of the original vertical posture. As shown in FIGS. 4 and 5B, the link bracket 11 is attached on the inner edge portion of the snow plow upper surface 51b. Each link bracket 11 supports a bent portion of a "<"-shaped link arm 12 by a pin 12a so as to be horizontally rotatable. As shown in FIG. 5A, the left and right sides of the Y-shaped joint 5b at the tip of the piston rod 5a One end of the link arm 12 is connected to each tip by a pin 12b. The other end of each link arm 12 is connected to the slide bracket 7 by a pin 12c as shown in FIG.

  With this configuration, when the piston rod 5a of the air cylinder device 5 is extended and moved forward, the left and right link arms 12 rotate clockwise (or counterclockwise) about the pin 12a, and the left and right slides The bracket 7 is retracted and the main cover 2 is simultaneously opened as shown in FIG. When the piston rod 5a of the air cylinder device 5 is contracted and retracted from this open state, the left and right link arms 12 rotate counterclockwise (or clockwise) about the pin 12a, and the left and right slide brackets 7 move forward. As shown in FIG. 2, the main cover 2 is simultaneously closed.

  As shown in FIGS. 4, 7 </ b> C, and 7 </ b> D, a pair of lock pin receivers 13 and 14 are attached to the front and rear to be slidable integrally with each slide bracket 7. Then, the forward position of the slide bracket 7 shown in FIG. 4, that is, the lock air cylinder device 15 is opposed to the lock pin receiver 14 located on the rear side in the closed state of the main cover 2 so that the lock air cylinder device 15 can move forward and backward. It is provided on the inner edge. A lock pin 16 is integrally attached to the tip of the piston rod 15a of the air cylinder device 15. When the piston rod 15a moves forward, the lock pin 16 is inserted into one of the lock pin receivers 14 and 13, and the main cover 2 is opened. Hold in state or closed state respectively. In order to release the open state or the closed state of the main cover 2, it is necessary to retract the piston rod 15 a and extract the lock pin 16 from one of the lock pin receivers 14 and 13.

  Next, the auxiliary cover 3 has a cross-sectional shape that curves outwardly as shown in FIG. 7B, and fixes the base 21 as a support plate on the rear end portion of the snow plow upper surface 51b. The base 21 is mounted in a freely deployable manner in a vertical posture (closed state) and a horizontal posture (open state) via a plurality (four) of hinge members 22. The auxiliary cover 3 is partially curved in a substantially L shape as shown in FIG. 7A, and the hinge stay 22a side of the hinge member 22 is mounted on the base 21 as shown in FIG. The other hinge portion 22b side is attached to an approximately middle position in the vertical direction on the inner surface of the auxiliary cover 3, and is configured to expand around the hinge pin 22c.

A suspension frame 23 is suspended from the vehicle body frame 1a, and a base end portion of an air cylinder device 25 is pivotally attached to a lower end portion of the suspension frame 23 via a clevis bracket 24 so as to be vertically rotatable. The air cylinder device 25 is inclined upward on the piston rod 25a side, and one link 26b rotatably connected by a pin 26c as shown in FIG. 7A is attached to the intermediate position in the vertical direction of the auxiliary cover inner surface 3b. The end fitting 27 of the piston rod 25a is connected to one end of the other "<"-shaped link 26a by a pin 27a. With this configuration, when the piston rod 25a is contracted, the auxiliary cover 3 is closed in a vertical posture, the piston rod 25a is extended, and the auxiliary cover 3 is developed around the hinge pin 22c, and is in a horizontal posture open state.

  The auxiliary cover 3 is opened and closed while partially overlapping the main cover 2. For this reason, the auxiliary cover 3 is positioned on the main cover 2 in a state where the main cover 2 is opened, and there is no risk of closing unless the main cover 2 is closed. On the other hand, in the closed state of the main cover 2, the auxiliary cover 3 may be opened carelessly even in the closed state. Therefore, when the piston rod 25a of the air cylinder device 25 is contracted, the base end surface of the air cylinder device 25 is engaged with the clevis bracket 24 as shown in FIG. ing.

  As shown in FIG. 8, in this embodiment, the left and right main cover 2 open / close air cylinder device 5, the main cover 2 opened and closed paired lock air cylinder devices 15 and 15 and left and right auxiliary cylinders are provided. A total of five air cylinder devices including a pair of air cylinder devices 25 for opening and closing the cover 3 are used. Each of the five air cylinder devices has a built-in limit switch LS that regulates the expansion and contraction, and the air pressure source common to the five air cylinder devices 5, 15, 15, 25, and 25 (see FIG. (Not shown), the pressurized air supply pipe 31 is divided into supply / exhaust pipes 31a and 31b via a main manual valve 34 and a sub manual valve 35, and via an electromagnetic valve 37, and is connected to the supply / exhaust port of the air cylinder device 5. ing. The air supply pipe 31 is branched downstream of the auxiliary manual valve 35, and the branched air supply pipe 32 is divided into supply / exhaust pipes 32 a and 32 b via the electromagnetic valve 38, and the pair of air cylinder devices 25 for opening and closing the auxiliary cover 3. -It is connected to 25 air supply / exhaust ports. Further, an air supply pipe 33 in which the air supply pipe 31 is branched downstream of the main manual valve 34 is divided into supply / exhaust pipes 33a and 33b via a lock manual valve 36 and an electromagnetic valve 39. It is connected to the air supply / exhaust port of the air cylinder device 15.

  The snow plow cover opening / closing device 10 according to the present embodiment is configured as described above. Here, the opening / closing operation of the main cover 2 and the auxiliary cover 3 will be described.

As shown in FIG. 2, in the closed state of the main cover 2 and the auxiliary cover 3, large portions on the upper side of the both side surfaces 51 a of the snow plow 51 are covered with the main cover 2 and the auxiliary cover 3. At this time, both covers 2 and 3 are in a vertical posture. In this state, the piston rod 5a of the air cylinder device 5 is retracted and is in a contracted state. The slide bracket 7 has advanced to the foremost position on the LM guide 6, and the main cover 2 is in a closed state in the vertical direction around a plurality of hinge pins. At this time, as shown in FIG. 4, the lock pin 16 of the lock air cylinder device 15 is inserted into the lock receiver 14 on the rear side, and the main cover 2 is held (locked) so as not to rise. The piston rod 25a of the air cylinder device 25 of the auxiliary cover 3 is retracted and is in a contracted state. The base end surface of the air cylinder device 25 is engaged with the clevis bracket 24, and the auxiliary cover 3 is held so as not to be lifted (locked).
Has been.

From this closed state, the auxiliary cover 3 is opened, and then the main cover 2 is opened, resulting in the open state shown in FIG. As shown in FIG. 9, the opening operation of the auxiliary cover 3 and the main cover 2 confirms whether or not the snow plow cover 51 is opened when an opening command is issued. Whether it is 5 km / h or less is confirmed. If YES, the opening of the auxiliary cover 3 is commanded and held, a 10-second timer is set, and it is confirmed whether the time is up. If the opening command is NO and the vehicle speed is 5 km / h or higher, the process returns to the first step. If the time-up is NO, it is confirmed whether or not the opening of the auxiliary cover 3 is completed, and the timer is reset. The opening command for the auxiliary cover 3 is released, and the unlocking command for the main cover 2 is held. If the timer is set for 10 seconds and the time-up is NO, it is confirmed whether or not the unlocking of the main cover 2 has been completed, and the timer is reset. The lock release command step of the main cover 2 is released, a timer for 10 seconds is set, and it is confirmed whether or not the time is up. If the time-up is NO, it is confirmed whether or not it is a command to open the main cover 2, and if it is YES, the timer is reset. The release command for the main cover 2 is released, and a lock insertion command for the main cover 2 is issued and held. A 10-second timer is set and it is checked whether the time is up. If the time-up is NO, it is confirmed whether or not the lock of the main cover 2 has been inserted. If YES, the timer is reset, the lock insertion command for the main cover 2 is released, and the opening operation is completed.

  On the other hand, in the control from the open state of the covers 2 and 3 of the snow plow 51 to the closing operation, it is confirmed whether or not the snow plow cover 51 is closed following the closing start step, as shown in FIG. If it is, it is confirmed whether or not the vehicle speed is 5 km / h or less. If YES, the unlocking of the main cover 2 is instructed and held, a 10-second timer is set, and whether or not the time is up Is confirmed. Note that if the command for opening operation is not issued and the answer is NO, or if the vehicle speed is not 5 km / h or less, the first step is returned. If the time is not up, it is confirmed whether or not the unlock command for the main cover 2 is released. If YES, the timer is reset, the unlock command for the main cover 2 is released, and then the main cover 2 is unlocked. The opening of the cover 2 is commanded and held. A timer for 10 seconds is set and it is confirmed whether the time is up or not. If NO, it is confirmed whether or not the main cover 2 is closed. If the main cover 2 is closed, the timer is reset and the main cover 2 is reset. Is closed, and the lock insertion of the main cover 2 is instructed and held. A timer for 10 seconds is set, and it is confirmed whether the time is up or not. If NO, it is confirmed whether or not the lock of the main cover 2 is inserted. If YES, the timer is reset, the lock insertion command for the main cover 2 is released, and then the auxiliary cover 3 is instructed to be closed. A timer for 10 seconds is set and it is confirmed whether or not the time is up. If NO, it is confirmed whether or not the auxiliary cover 3 is closed. If the auxiliary cover 3 is closed, the timer is reset and the auxiliary cover 3 is closed. Is closed and the closure is completed.

  In this way, the opening and closing operations of the main cover 2 and the auxiliary cover 3 are controlled by the computer or the sequence according to the control flow.

  Although the embodiment of the snow plow cover opening / closing device 10 according to the present invention has been described above, it can also be implemented as follows.

・ If both sides of the snow plow are close to a straight line when viewed from above, in other words, if the degree of curvature is small, the main cover 2 alone can be used. The cover 3 can also be used in two places on one foot.

-Although an air cylinder device is used as a drive actuator, a hydraulic cylinder device can be used.

When the installation space for the link bracket 11 and the locking air cylinder device 15 is not sufficient on the snow plow upper surface 51b, for example, a support plate material such as the base 21 can be attached and installed on the upper surface 51b.

It is a side view which shows the front-end | tip part of the head vehicle provided with the snow plow cover opening / closing apparatus concerning the Example of this invention. It is a perspective view which shows the snow plow cover opening / closing apparatus of the Example of this invention, and represents the closed state of the cover. The perspective view similar to FIG. 2 which shows the snow plow cover opening / closing apparatus of the Example of this invention is represented, and the open state of a cover is represented. In the top view which shows the snow plow cover opening / closing apparatus concerning the Example of this invention, the right half is abbreviate | omitted. 4A is a cross-sectional view taken along line AA in FIG. 4, FIG. 4B is a cross-sectional view taken along line BB in FIG. 4, FIG. 4C is a cross-sectional view taken along line CC in FIG. FIG. 4E is a cross-sectional view taken along line EE in FIG. 4, FIG. 4F is a cross-sectional view taken along line FF in FIG. 4, FIG. 4G is a cross-sectional view taken along line LL in FIG. FIG. 4A is a sectional view taken along line GG in FIG. 4, FIG. 4B is a sectional view taken along line HH in FIG. 4, FIG. 4C is a sectional view taken along line JJ in FIG. FIG. 1 is a pneumatic circuit diagram of a snow plow cover opening / closing device according to an embodiment of the present invention. The control flow diagram of the snow plow cover opening / closing device shows when the cover is open. The control flow diagram of the snow plow cover opening / closing device represents the time when the cover is closed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lead vehicle 1a Body frame 1b Outer shell 1c Combined cover 2 Main cover 3 Auxiliary cover 5 Air cylinder device 5a Piston rod 5b Y-shaped joint 6 LM guide 7 Slide bracket 8 Connecting rod 9 Hinge stay 10 Snow plow cover opening / closing device 11 Link bracket 12 Link arm 13/14 Lock pin holder 15 Lock air cylinder device 16 Lock pin 21 Base (support plate)
22 Hinge member 23 Suspension frame 24 Clevis bracket 25 Air cylinder device 27 Tip fitting 51 Snow plow

Claims (3)

A pair of openable and closable covers covering both side surfaces of a substantially V-shaped snow plow fixed to the front vehicle body bottom front end of the leading vehicle via a support device;
Each cover is formed from a substantially plate-like body extending in parallel with each side surface of the snow plow, and an upper end edge of each cover is directed downward along a plurality of hinge members along each upper outer edge portion of the snow plow. Attached so that it can be deployed between a closed state and a laterally open state,
On the front end portion of the support plate fixed on each upper surface or upper surface of the snow plow, the cylinder device is installed at the center in the vehicle width direction on the support device so that the forward piston rod moves forward and backward. In addition, each of the refracting portions of the "<"-shaped link arm is pivotally supported so as to be horizontally rotatable, and one end of each link arm is pivotally connected to the front end portion of the piston rod,
A slide bracket is slidably disposed in a direction perpendicular to each side surface of the snow plow at a substantially intermediate position in the longitudinal direction of each side of the snow plow, and the tip of each slide bracket is slid through a connecting member. Connect to each cover so that each cover expands in the vertical direction by the advancement and retraction of the bracket,
A snow plow cover opening and closing device characterized in that the other end of each link arm is pivotally connected to each slide bracket. A pair of auxiliary covers separately from the openable / closable covers are partially overlapped with the rear end portions of the upper surfaces of the snow plows via hinge members and overlapped with the upper end portions of the cover. Attached to the open state that covers each side of the plow almost horizontally,
The base end portion of the cylinder device for deploying each auxiliary cover is connected to a support member suspended from the vehicle body frame so as to be vertically rotatable, and the piston rod tip portion is inclined sideways upward, 2. The snow plow cover opening / closing device according to claim 1, wherein the snow plow cover opening / closing device is pivotally connected to a substantially intermediate position in the vertical direction of the inner surface of the auxiliary cover.   A pair of lock pin receivers are provided on one side surface of each slide bracket so as to be able to advance and retreat integrally with a space in the front and rear direction, and selectively with respect to the lock pin receivers in a closed state and an open state of the openable cover. The snow plow according to claim 1 or 2, wherein a locking cylinder device having a lock pin that can be inserted at a tip thereof is provided on an upper surface of the snow plow or a support plate material fixed to the upper surface so as to face each other. Cover opening and closing device.

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