JPH0333774Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a wheel shoe oscillation support device for a snow plow for a snow removal truck.

[Prior Art and Problems to be Solved] Snow plows for snow removal trucks are extremely heavy, and it is practically impossible to propel the snow plow by directly contacting the road with the snow plow. For this reason, this type of snow plow for snow removal trucks has been equipped with a metal sled-type shoe device. However, even if these sled-type shoes are made of steel, they are subject to strong friction with the road surface during movement, so they wear out rapidly and do not last long, and the sled must be replaced after a short period of time. I had to.

For this reason, wheel shoes have recently been developed and put into practical use in place of sled-type shoes, and have solved the above-mentioned durability problem caused by friction with the road surface.

However, the wheel shoe of a snow plow of a snow removal truck must have a sufficiently strong structure to withstand the weight and weight of the plow as well as the propulsion force of the snow removal truck, so the support device of the wheel shoe alone weighs a considerable amount of weight. I'm getting used to it. Moreover, the roads targeted for snow removal are not necessarily flat, straight roads, but usually curve to the right. Therefore, the wheel shoe support device needs to have a swinging function so that it can smoothly follow the progress of the snow removal truck as it moves along the twisting and turning roads.

Therefore, in the past, as shown in FIG. 5, the mounting bracket 6 at the rear of the snow plow 1
, attach the screw shaft 7 so that it can pivot,
Screw shaft 7 and screw boss 12
A wheel shoe swinging support device has been generally used which connects the leg frame 4 of the wheel shoe W so as to be able to swing from side to side via the wheel shoe W, and supports and moves the snow plow 1 on the road surface with the wheel shoe W at the lower end.
In this case, the connection position of the wheel shoe W to the screw shaft 7 is a lock nut 15 screwed onto the screw boss 12.
By loosening and separating the screw shaft 7 from the screw boss 12 and rotating the screw shaft 7, the snow plow 1 can be set at a level suitable for snow removal. Therefore, stopper plates 14 (fixed to the mounting bracket 6) are arranged on both outer sides of the leg frame 4 to prevent the leg from swinging beyond a predetermined angle.

However, when the snow plow 1 is lifted off the road surface and transported by a snow removal truck, the snow plow W is also lifted off the road surface and is transported while violently swinging from side to side.
Then, the weight of the wheel shoe W, which is designed and manufactured to be strong enough to support the snow plow 1, is naturally large, and the connection position of the wheel shoe W is locked due to the inertial resistance of the wheel shoe W, which swings violently. The lock nut 15 that is in place and the stopper plate 13 that regulates the swing angle will be destroyed. If this happens, the level adjustment function of the snow plow 1 will malfunction, and the wheel shoe W will swing due to even greater inertia resistance and violently collide with the snow plow 1, the carrier section 17, and the hoist section 18 while driving, and the mechanism section In addition to destroying the vehicle, it may also cause traffic accidents in some cases.

The present invention was developed in an attempt to eliminate the above-mentioned drawbacks of conventional wheel shoe oscillation support devices, and the mechanism for adjusting the height of the wheel shoe is stable, and the wheel shoe does not oscillate more than necessary. It is an object of the present invention to provide a wheel swing support device for a snow plow for a snow removal truck that is safe, highly reliable, and practical.

[Means adopted to solve the problem]

The means adopted by the present inventor to solve the above technical problem will be explained with reference to the attached drawings.
It is as follows.

That is, in the present invention, the leg frame 4 is swingably supported on the screw shaft 7 which is rotatably supported vertically on the mounting bracket 6 at the rear of the snow plow 1, and the wheel shoe W at the lower end of the leg frame 4 is moved left and right. Based on the technical premise of a wheel show oscillation support device for a snow plow for a snow removal truck which is well known in the art and is supported in a swingable manner, a link plate 2 is fixed to the upper end of the screw shaft 7 so as to face the wheel show W. A vertical shaft pin 3 extending vertically is connected and fixed to the free end of the link plate 2 to connect it to the wheel shoe W, and near the center of the rear surface of the snow plow 1 is a connector having a regulation elongated hole 10 at the free end. The connecting bar 9 is pivotally supported, and the upper end of the vertical shaft pin 3 is loosely connected to the regulating hole 10 of the connecting bar 9, and a stopper plate 13 is attached to the outside of the leg frame 4. The above-mentioned technical problem was solved by employing a clever mechanism in which a buffer means 14 is disposed on the mounting bracket 6 so as to restrict the rotation range of the mounting bracket 6.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on embodiments shown in the accompanying drawings.

First, in FIG. 4, the wheel shoe W constituting the wheel shoe W device M is rotatably mounted on the lower end of the leg frame 4. As shown in FIG. This wheel show W is connected to the snow plow 1 with the following structure and is able to swing around the left and right axis. That is, a mounting bracket 6 is protruded from the back of the snow plow 1, a screw shaft 7 is vertically installed so as to pass vertically through the mounting bracket 6, and a screw shaft 7 is rotatably mounted on the screw shaft 7. The leg frame 4, which is provided with the wheel shoe W at the lower end, is fixed to the screw boss 12 by screwing into the screw boss 12. With this structure, the leg frame 4 and the wheel shoe W are attached to the screw shaft 7. It can swing freely around its axis.

In this embodiment, the leg frame 4 is bent in a "h" shape, and an L-shaped bracket 5 is attached to the bent shoulder portion of the leg frame 4, and a vertical pin 3 is connected to the bracket 5. On the other hand, the upper end of the screw shaft 7 has a square head shape, and the link plate 2 is fixed to the square head at the upper end of the screw shaft 7. The vertical pin 3 is fixed to the free end side of the link plate 2, which is rotated in accordance with the rotational movement of the axis.
It is constructed so that the swing angle of the wheel shoe W and the rotation angle of the screw shaft 7 do not deviate.

Further, a connecting bar 9 is pivotally supported near the center of the back of the snow plow 1, and a regulating long hole 10 is opened at the free end side of the connecting bar 9. 2 and the vertical shaft pin 3 connected to the bracket 5 can freely move.

Therefore, the swinging of the link plate 2 is regulated by the length of the regulating elongated hole 10.
In addition, in this embodiment, the screw boss 12
A stopper plate 13 is provided approximately in the center of the snow plow 1, and by bringing it into contact with buffer ribs 14 provided on both sides of the mounting bracket 6 on the back of the snow plow 1, the swing angle of the wheel show W is regulated within a predetermined range. be done. In other words, the swing angle of the wheel shoe W and the leg frame 4 is subject to range regulation by the regulation slot 10 of the connecting bar 9 and double regulation by the collision between the stopper plate 13 and the buffer rib 14. Destruction of mechanical parts can be reliably prevented by regulating heavy swinging.

Note that the reference numeral 16 in the figure indicates the screw shaft 7.
This is a protective bellows that destroys the exposed parts of the screw shaft 7 and the screw boss 12, and is installed to prevent the screw shaft 7 and the screw boss 12 from rusting due to splashes of antifreeze and chemical solutions.

The "wheel swing swing support device" of this embodiment constructed as described above is a folding type snow plow in which the snow plow 1 is foldably connected with the side plow plates 1b, 1b on both sides of the center plow plate 1a. This is particularly effective in the case of To explain this point in more detail, a pair of left and right hydraulic cylinders 1 are installed on the vehicle side of the carrier 17.
By the contraction operation of 9a and 19b, the hinge pin 2
Plows 1 at both left and right ends with 0a and 20b as fulcrums
b, 1b are rotated toward the carrier 17 side, and hinge pins 20 on both ends of the plow central portion 1a
The connecting bar 9, which is pivotally supported by pins 8 provided near a and 20b, also rotates toward the carrier 17 using the pin 8 as a fulcrum, similar to the plows 1b at both left and right ends. A pin 3 fixed to the link plate 2 is pivotally attached to a regulation slot 10 at the tip of the connecting bar 9, and as the connecting bar 9 rotates, the pin 3 moves freely within the regulation slot 10. The long hole 10
The link plate 2 is allowed to rotate about the screw shaft 7 within the range of the terminal end. By this rotation of the link plate 2, the vertical pin 3
The wheel shoe W swings through the bracket 5 that engages with the leg frame 4 and the leg frame 4. Together with the regulation of the stopper plate 13 provided at the center of the screw boss 12 that is integrated with the leg frame 4, the snow removal truck is securely locked, and is prevented by the vibration of the snow removal truck while it is moving or the centrifugal force at the curve. It is possible to surely prevent the wheel show W from swinging its head unnecessarily.

[Effects of this invention]

As explained above with reference to the embodiments, in the "wheel shoe swing support device" constructed by applying the present invention, the link plate and the connecting bar are clearance-coupled as described above. In addition to regulating the angle, the stopper plate and shock absorbing means are arranged in combination to double regulate and support the swing angle of the wheel show.
Even when the snow removal truck runs at high speed during forwarding, the wheel shoe does not oscillate due to dangerous inertia force, and damage to mechanical parts and occurrence of traffic accidents can be effectively prevented.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment in which the present invention is applied to a folding type snow plow, Fig. 2 is a plan view of the plow with both ends folded to which the device of the present invention is attached, and Fig. 3 4 is a side view showing the main components of the device of this embodiment, and FIG. 5 is a side view schematically showing a conventionally known wheel swing oscillation support device. , 6th
7 is a detailed plan view showing the wheel shu neutral state of the device of this embodiment. FIG. 8 is a detailed plan view showing the left side of the wheel shu of the device of this embodiment. FIG. 3 is a detailed plan view showing a swing limit state. 1...Snow plow, 2...Link plate,
3...Pin, 4...Leg frame, 5...Bracket, 6...Mounting bracket, 7...Screw shaft, 8...Pin, 9...Connecting bar, 10...Regulation slot, 12... Screw boss, 13...stopper plate, 14...buffer means (rib), 15...lock nut, 16...
Bellows, 17...Carrier, 18...Hoist part, 19a, 19b...Fluid pressure operated cylinder,
20a, 20b...hinge pins.

Claims (1)

[Claims for Utility Model Registration] A leg frame 4 is swingably supported on a screw shaft 7 which is rotatably supported vertically on a mounting bracket 6 at the rear of the snow plow 1, and a wheel shoe W at the lower end of the leg frame 4 is supported. In a wheel shoe swinging support device for a snow plow for a snow removal truck which is supported so as to be able to swing left and right, a link plate 2 is fixed to the upper end of the screw shaft 7 so as to face the wheel shoe W, and this link plate 2 A vertical shaft pin 3 extending vertically is connected and fixed to the free end of the snow plow 1 to connect it to the wheel show W, and a connecting bar 9 having a regulating hole 10 at the free end is mounted near the center of the rear surface of the snow plow 1. The upper end of the vertical pin 3 is loosely connected to the regulating hole 10 of the connecting bar 9, and a stopper plate 13 is attached to the outside of the leg frame 4, while regulating the rotation range of the stopper 13. A wheel shoe oscillation support device for a snow plow for a snow removal truck, characterized in that the mounting bracket 6 is provided with a buffer means 14 so as to do so.