Road paving machine and upper cover used therein

Abstract

To eliminate a gap in a central part of an upper cover of a screed of a road paver.SOLUTION: An upper cover 3 of a screed 2 has left end brackets 3a, 3a protruding from the left end and right end brackets 3b, 3b protruding from the right end, and the right end brackets 3b, 3b have long holes 3j and are fastened with a margin. In addition, a gap D is provided as an absorbing margin between the screed 2 and the upper cover 3. As a result, since the upper cover 3 can be displaced in the gap D, the crown operation can be performed without providing a gap in the central portion of the upper cover 3.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to a top cover for use on top of a screed of a road paving machine. [Background technology]

[0002] To prevent water from pooling in the center of a paved road, it is necessary to create a gradient in the width direction of the road. For this reason, the screed of the road paving machine needs to be folded in a mountain shape at its center (hereinafter referred to as "crown operation"). Crown operation has been performed for a long time and is described in, for example, Patent Document 1.

[0003] During crown operation, the screed spreads out on both sides from its center, so it was necessary to leave a gap in the center of the cover above the screed (see, for example, Patent Document 2, Non-Patent Document 1, and Figure 12).

[0004] Thus, the upper cover of the screed typically had a gap in the center, which acted as a buffer when the screed was folded into a mountain shape during the crowning operation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Jpn. Jpn. Published No. 58-30815 [Patent Document 2] JP 2005-90043 A [Non-patent literature]

[0006] [Non-Patent Document 1] Internet, search date: December 27, 2021, Hantak Machinery Co., Ltd., https: / / www.hantak.co.jp / product / pdf / F45WJ5.pdf Summary of the Invention [Problem to be solved by the invention]

[0007] However, there was a possibility that foreign objects such as asphalt mixture or diesel could get in through the gaps. There was also a safety concern that workers could get stuck in the gaps.

[0008] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to eliminate gaps in the central portion of the upper cover of a screed for a road paving machine. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention has the following features: The present invention is an upper cover for a screed of a road paving machine, wherein at least the left end or the right end of the upper cover is attached to a frame of the screed with a gap provided therebetween, and the upper cover can be shifted into the gap during a crown operation of the screed.

[0010] In a preferred embodiment, the top cover includes a first bracket provided at one end thereof and a second bracket provided at the other end thereof, and at least one of the first bracket and the second bracket is attached to protrude from the right end or the left end of the top cover, so that a gap is provided between the screed frame and the right end or the left end of the top cover, and the top cover can be shifted into the gap during crowning of the screed.

[0011] In a preferred embodiment, the bracket providing the gap, either the first or second bracket, has an elongated hole which is fastened to the top cover with sufficient clearance to allow the top cover to slip into the gap when the screed is crowned.

[0012] Preferably, the elongated hole and the upper cover are fastened together via a vibration-isolating rubber.

[0013] The present invention is also a road paver comprising a screed having an upper cover. Effect of the Invention

[0014] At least the left or right end of the upper cover is attached with a gap between it and the screed frame, and by allowing the upper cover to shift into the gap during crown operation of the screed, it is possible to eliminate a gap in the central part of the upper cover of the screed of the road paving machine.

[0015] This reduces the possibility of foreign objects such as asphalt mixture or diesel getting into the gaps, and also eliminates safety concerns about workers getting stuck in gaps.

[0016] By configuring the bracket to protrude from the upper cover, it is possible to easily provide a structure for creating a gap between the screed and the upper cover.

[0017] By providing a slot in the bracket and fastening the slot to the upper cover with a sufficient margin, it is possible to easily achieve the misalignment of the upper cover when the crown is operated.

[0018] Using anti-vibration rubber can prevent the upper cover from rattling.

[0019] These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a rear view of a road paving machine 1 according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a left side view of the screed 2 portion of the road paving machine 1. [Diagram 3] FIG. 3 is a right side view of the screed 2 portion of the road paving machine 1. [Figure 4]FIG. 4 is a plan view of the upper cover 3 of the screed 2. [Diagram 5] FIG. 5 is a rear view of the upper cover 3. FIG. [Figure 6] FIG. 6 is a bottom view of the upper cover 3. FIG. [Figure 7] FIG. 7 is an enlarged left side view of the upper cover 3. As shown in FIG. [Figure 8] FIG. 8 is an enlarged right side view of the upper cover 3. As shown in FIG. [Figure 9] FIG. 9 is a perspective view of the upper cover 3 from diagonally above. [Figure 10] FIG. 10 is a perspective view of the upper cover 3 from diagonally below. [Figure 11] FIG. 11 shows an embodiment of the upper cover 3. In FIG. [Figure 12] FIG. 12 is a diagram showing a gap in a conventional upper cover. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] As shown in Figures 1 to 3, an upper cover 3 is provided on a screed 2 of a road paving machine 1. As shown in the shaded area D in the enlarged view shown in the upper right of Figure 1, a gap D (absorption allowance) is provided between the right end of the upper cover 3 and the frame of the screed 2.

[0022] As shown in FIG. 2, a frame 4a is provided on the upper left portion of the screed 2.

[0023] As shown in FIG. 3, a frame 4b is provided at the upper right portion of the screed 2.

[0024] The upper cover 3 is attached between the frame 4a and the frame 4b.

[0025] The structure of the upper cover 3 will be described with reference to Figures 4 to 10. The upper cover 3 has left end brackets (first brackets) 3a, 3a and right end brackets (second brackets) 3b, 3b. The left end brackets 3a, 3a and the right end brackets 3b, 3b are attached so as to protrude from the left and right ends of the upper cover 3.

[0026] In this embodiment, the left brackets 3a, 3a also protrude from the left end, but the left end does not have to protrude. As described later, the right end brackets 3b, 3b have a structure that allows for misalignment, so by having at least the right end brackets 3b, 3b protrude from the right end, it is possible for the upper cover 3 to be misaligned into the gap D during crown operation.

[0027] 7, the left end bracket 3a is fixed by a pin 3c via a vibration isolator 3d, and the end of the left end bracket 3a is fixed to the frame 4a by welding or the like.

[0028] As shown in Fig. 6, the right end bracket 3b has a long hole 3j in the width direction of the road paving machine 1. Ends of the right end bracket 3b are each fixed to the frame 4b by welding or the like.

[0029] As shown in Fig. 8, the right end bracket 3b is attached to the upper cover 3 by a pin 3e, a washer 3g, and a nut 3f, with a washer 3i and a vibration-proof rubber 3h sandwiched between them. However, since the upper cover 3 needs to shift when the screed 2 becomes mountain-shaped during crown operation, the nut 3f is fastened with a certain amount of leeway so that the pin 3e can shift within the long hole.

[0030] 10, a long hole 3j is provided on the right end bracket 3b side, and therefore, during crown operation, the right end of the top cover 3 is shifted into the gap D by the clearance of the nut 3f and the long hole 3j. As a result, even when the crown is operated, there is a place where the top cover 3 can escape, so there is no need to provide a gap in the center.

[0031] Figure 11 is a photograph showing the gap when actually manufactured. As shown in Figure 11, the gap in the center of the upper cover can be eliminated, which reduces the possibility of foreign objects such as asphalt mixture or diesel getting in, and also eliminates safety concerns about workers getting stuck in it.

[0032] (Modification) In the above embodiment, the gap D is provided at the right end of the upper cover 3. However, if the structure is reversed, the gap D can be provided at the left end.

[0033] In the above embodiment, the gap D is provided at the right or left end, but the gap D may be provided at both ends. In other words, it is sufficient that a gap is provided between at least one of the left and right frames at the top of the screed 2 and the upper cover 3.

[0034] The structures of the left and right brackets in the above embodiment are merely examples and do not limit the present invention. Also, an upper cover that causes a shift into the gap may be used by using means other than brackets, for example, by processing the upper cover into a shape that allows it to be directly attached to the frame.

[0035] In other words, in the present invention, at least the left end or the right end of the upper cover is attached with a gap between it and the screed frame, and the upper cover can shift into the gap when the screed is crowned.

[0036] Although the present invention has been described in detail above, the above description is merely illustrative of the present invention in every respect and is not intended to limit the scope of the present invention. It goes without saying that various improvements and modifications can be made without departing from the scope of the present invention. Each of the constituent elements of the invention disclosed in this specification is considered to be an independent invention. Inventions in which each of the constituent elements is combined in any combination method are also included in the present invention. [Industrial Applicability]

[0037] INDUSTRIAL APPLICABILITY The present invention relates to a road paving machine and an upper cover used therewith, and is industrially applicable. [Explanation of symbols]

[0038] 1. Road paving machines 2. Screed 3 Top cover 3a Left end bracket 3b Right end bracket 3c Pin 3d anti-vibration rubber 3e pin 3f Bolt 3g washer 3h Anti-vibration rubber 3i Washer 3j long hole

Claims

1. An upper cover for a screed of a road paving machine, comprising: At least the left end or the right end of the upper cover is attached to the frame of the screed with a gap provided therebetween, A top cover, characterized in that the top cover can be displaced into the gap during crowning of the screed.

2. The upper cover is a first bracket provided at one end thereof; and a second bracket provided at the other end, At least one of the first bracket or the second bracket is attached so as to protrude from the right end or the left end of the upper cover, so that the gap is provided between the screed frame and the right end or the left end of the upper cover, The top cover according to claim 1 , characterized in that the top cover can be displaced into the gap during crowning of the screed.

3. The bracket having the gap between the first bracket and the second bracket has a slot, The upper cover according to claim 2, characterized in that the slot and the upper cover are fastened with a sufficient clearance so that the upper cover can slip into the gap during a crowning operation of the screed.

4. 4. The upper cover according to claim 3, wherein the oblong hole and the upper cover are fastened together via a vibration isolating rubber.

5. A road paving machine comprising a screed and an upper cover as described in claim 1.

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