JPH04287601A - Manufacturing method of elastic cover for rotary tiller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an elastic cover for a rotary tiller which is attached to the inner surface of a plate cover.

0002

[Prior art] As an elastic cover for a rotary tiller,
There is a method disclosed in Japanese Utility Model Application Publication No. 52-136007, in which a sheet-like elastic cover is arranged on the inner side of an iron plate cover fixed to the rotary machine frame to cover the upper part of the tilling section, and this elastic cover is It is bolted to the iron plate cover in the middle and left slack between the fixing positions, and this slack part absorbs the impact of scattered soil and prevents soil from adhering.

0003

[Problems to be Solved by the Invention] The elastic cover of the prior art is extremely easy to manufacture because it becomes a sheet-like product simply by vulcanizing it in a mold having a flat cavity. The steel plate cover has through-holes for bolt fixing, and cracks may occur from the through-holes, and although there is a gap between the steel plate cover and the slack part, it cannot be installed in a tensioned state. The fixed part is in direct contact with the steel plate cover, and if a stone etc. collides with it, the slack part may come into contact with the steel plate cover.
The iron plate cover may be subjected to impact or the elastic cover may be crushed by the stone and the iron plate cover, and it is very troublesome to attach and remove the elastic cover because it must be fixed with a large number of bolts. .

[0004] Therefore, an outwardly protruding engaging portion is formed on the outer surface of the elastic cover, and a locking portion that engages with the engaging portion is formed on the inner surface of the plate cover, so that the attachment is secured to the engaging portion. It is conceivable that this is done by engaging the engaging parts, and the gap is formed by protruding the engaging parts. However, it is difficult to provide the above-mentioned protruding engaging portions using the conventional elastic cover manufacturing method. Furthermore, the width of the plate cover varies depending on the model, and in order to manufacture elastic covers of different widths, all types of molds must be prepared, which raises the problem of increased product cost.

[0005] A first object of the present invention is to form a required number of engaging portions on the front, back, and middle portions of the surface of an unvulcanized flat elastic cover material to engage with locking portions on the inner surface of the plate cover. A rotary rotary that allows you to easily form a protruding engaging part on an elastic cover by simply placing unvulcanized engaging part materials through a core and vulcanizing and adhering them in a vulcanization mold. The present invention provides a method for manufacturing an elastic cover for a tiller.

[0006] A second object of the present invention is to provide a vulcanization mold that is divided into three parts in the left and right direction, the left and right side bodies and the middle body, and the middle body can be changed to have different lengths in the left and right direction. , disposed via cores at the front, back, and midway portions of the surface of the elastic cover material in order to form an unvulcanized flat elastic cover material and the required number of engaging portions that engage with the locking portions on the inner surface of the plate cover. By simply inserting the unvulcanized engaging part material and vulcanizing and adhering them, a protruding engaging part can be easily formed on the elastic cover, and elastic covers with different left and right widths can be formed. An object of the present invention is to provide a method of manufacturing an elastic cover for a rotary tiller.

[0007]

[Means for Solving the Problems] A first specific configuration for solving the problems of the present invention is that the plate cover 15 is placed along the inner surface of the tilling section 8 with a gap C therebetween, and the front, rear and middle portions thereof are A method for manufacturing an elastic cover for a rotary tiller, in which a required number of locking portions B on the inner surface of the plate cover 15 are engaged with the front, rear and middle portions of the surface of the unvulcanized flat elastic cover material 38. An unvulcanized engaging part material 39 forming the engaging part A is placed through a core 40, and these are vulcanized and bonded in a vulcanizing mold 41.

The second specific configuration is a method for manufacturing an elastic cover for a rotary cultivator, in which the cover 15 is attached along the inner surface of the plate cover 15 covering the cultivating part 8 with a gap C therebetween, and the front, rear and middle parts thereof are attached. A vulcanizing mold 41 is divided into three parts in the left and right direction, ie, a left and right side body 42 and an intermediate body 43, and the intermediate body 43 can be changed to one having a different length in the left and right direction.
In order to form an unvulcanized flat elastic cover material 38 and a required number of engaging portions A that engage with the locking portions B on the inner surface of the plate cover 15, the front, rear and middle portions of the surface of the elastic cover material 38 are The unvulcanized engaging portion material 39 is placed through the core 40.
and then vulcanize and bond them together.

[0009]

[Operation] A flat elastic cover material 38 and a required number of engaging portion materials 39 are formed in an unvulcanized state in advance, and the engaging portions are formed at the front, back, and middle portions of the surface of the flat elastic cover material 38. The member material 39 is placed through the core 40, and these are vulcanized and bonded in a vulcanization mold 41. The engaging portion material 39 is formed into a protruding engaging portion A without being deformed by the core 40. This elastic cover 14 is curved while cultivating the tilling section 8.
When the elastic cover 14 is fitted along the inner surface of the plate cover 15 covering the plate cover 15 and engaged with the locking part B on the inner surface of the plate cover 15, the elastic cover 14 is attached in a tensioned state and a gap C is formed between the elastic cover 14 and the plate cover 15. It turns out.

Further, the vulcanization mold 41 is divided into three parts in the left and right direction: left and right side bodies 42 and a middle body 43, and the middle body 43 is changed to one having different lengths in the left and right direction, and an elastic cover is provided. By matching the length of the material 38 and the number of engaging portion materials 39, elastic covers 14 with different left and right widths are formed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. In Figure 7, 1 is a tractor-mounted rotary tiller, which extends from the central gear case 2 to the left and right support arms 3.
A rotary machine frame 5 is formed by fixing the transmission case 4 and the side frame to the outer end of each support arm 3, and a claw shaft 6 is attached to the lower part of the transmission case 4 and the side frame so that it can freely rotate around a horizontal axis. A number of tilling claws 7 are attached to this claw shaft 6 to form a tilling section 8.

A cover device 10 that covers the tilling section 8 is attached to the rotary machine frame 5.
0 is a main plate cover 11 that covers the upper part of the tilling part 8, a rear plate cover 12 that covers the rear part, a front cover 13 that covers the front part, a front and rear side plate cover (not shown) that covers the left and right front and rear parts, and a main plate cover 11 that covers the upper part of the tilling part 8.
Inner side of rear plate covers 11, 12 (cultivating part 8 side)
and an elastic cover 14 disposed in the area.

In FIGS. 1 to 8, 15 is the main plate cover 11.
The main plate cover 11 is made of a steel plate or a reinforced plastic plate, and includes a rear plate cover 12 and a rear plate cover 12.
is formed by upper and lower walls 11a, 11b, left and right side walls 11c, front and rear beams 11d, 11e, etc., and the left and right side walls 11c are fixed to the transmission case 4 and the side frame. The main plate cover 11 is gradually thinned from the front and back to the middle, and is formed so that the diameter of the tilling section 8 can be made larger.

[0014] The rear plate cover 12 has a reinforcing wall 12b fixed to the front upper part of the main wall 12a, and has a reinforcing wall 12b fixed to the front upper part of the main wall 12a.
It is formed by fixing a plurality of reinforcing ribs 12c, and the rear part of the main plate cover 11 and the front upper part of the rear plate cover 12 are connected via a pivot part 16, and the rear lower part of the rear plate cover 12 can be moved up and down. I have to. A triangular notch 18 for arranging a cultivator is formed at the center of the rear lower part of the rear plate cover 12, and is closed by attaching a removable triangular plate 19 when the cultivator is not in use. In addition, rear gauge wheel escape notches 20 are formed on the left and right sides of the rear lower part, and when the rear gauge wheel is not used, an auxiliary plate 21 is provided.
is closed.

A support arm 23 is protruded rearward from the left and right support arms 3 via a bracket 22, and the rear end of this support arm 23 and the reinforcing rib 12c of the rear plate cover 12 are connected to each other.
An equalizing pressure adjusting means 24 is provided between the two. The elastic cover 14 is mainly made of rubber or elastic synthetic resin, and has a sheet shape, and as shown in FIGS. The formed hood cloth is arranged in a sandwich to form a three-layer structure consisting of the elastic layers 14a, 14a and the reinforcing layer 14b, which is easily elastically deformed but does not stretch much.
It is designed to be durable. The reinforcing layer 14b
It is desirable that the hood cloth is plain woven and its front and rear tensile strength is set higher than that of the left and right.

Furthermore, a large number of engaging portions A are formed on the outer surface of the elastic cover 14. This engaging portion A is made of a material that is the same as the elastic layer 14a and has high hardness, for example, the elastic layer 1
When 4a is made of synthetic rubber with a JIS hardness of around 35°, the engaging part A is made of synthetic rubber with a JIS hardness of around 70°, and is formed by forming hook-shaped blocks and joining them with vulcanization adhesive etc. It can be molded in a short time using a mold.

The elastic cover 14 has a main plate cover corresponding portion 26 facing the inner surface of the main plate cover 11 and a rear plate cover 1.
The rear plate cover 12 has a rear plate cover corresponding portion 27 facing the inner surface of the rear plate cover 12, and the rear plate cover 12 is bumped at a portion facing the pivot portion 16 in order to swing rearward and upward. The engaging portion 26A provided in an outwardly projecting shape on the outer surface of the main plate cover corresponding portion 26 includes front and rear engaging portions 26Af, 26Ag, at least one intermediate engaging portion 26Ah, and left and right side ribs 26Ak. have The front and rear engaging portions 26Af and 26Ag are formed to have a length that spans approximately the entire plowing width, and the engaging groove af of the front engaging portion 26Af is in the front and back opposite direction to the engaging grooves ag and ah of the other engaging portions 26Ag and 26Ah. It is opened and facing. Midway engagement part 2
6Ah is formed shorter than the total plowing width.

The side ribs 26Ak are formed on the left and right sides of the main plate cover corresponding portion 26 as protrusions having approximately the same height as the other engaging portions 26A. Both left and right ends of the rear engaging portion 26Ag are formed continuously with the rear ends of the side ribs 26Ak to prevent muddy water from entering from the outside from the rear of the elastic cover 14 to the sides. The front engaging portion 26Af
A notch-shaped opening 35 is formed at least at one location on the left and right sides or in the center. This opening 35 is for draining muddy water even if it enters the gap C between the elastic cover 14 and the main plate cover 11. Even though the front engaging portion 26Af forms the opening 35, it is connected at the lower thin portion 36, and is attached to the seat portion as a single length. This thin portion 36 may be formed above the opening 35.

Each of the engaging portions 2 are provided on the inner surface of the main plate cover 11.
Locking part 26Bf corresponding to 6Af, 26Ag, 26Ah
, 26Bg, and 26Bh are formed. Front locking part 26
Bf is formed by overlapping the front edges of the upper and lower walls 11a and 11b, and is engaged with the front engaging portion 26Af from the front. The rubber locking portion 26Bg and the midway locking portion 26Bh are formed by welding or gluing S-shaped plates to the main plate cover 11, and a plurality of short ones are provided at intervals in the plowing width direction. Engagement portions 26Ag, 26 corresponding to
Ah is engaged from behind. The main plate cover 11
A notch 37 is formed at the front of the elastic cover 14 to correspond to the opening 35 of the elastic cover 14 so as not to impede removal of muddy water.

A front cover 13 made of an elastic material is attached to the front part of the upper wall 11a of the main plate cover 11 via a restraining plate 29 and bolts 30, and the front engaging part 26Af is attached to the front part of the main plate cover 11 together with the front cover 13. It is held between the front edge and the restraining plate 29. This prevents the main plate cover corresponding portion 26 from shifting in the left-right direction with respect to the main plate cover 11. The protruding portion 28 can prevent the rear portion of the main plate cover corresponding portion 26 from shifting significantly from side to side.

The chevron-shaped member located on the rear side of the intermediate engagement portion 26Ah forms a retaining portion 31 fixed to the main plate cover 11, and prevents the engagement portion 26A from easily separating from the engagement portion 26B. to prevent Also on the outer surface of the rear plate cover corresponding part 27, engaging parts 27Af, 27Ag, and 27Ah are provided in the front and rear parts (more precisely, the front upper part and the rear lower part) and the middle part in an outwardly protruding manner, and the front engaging parts 27Af is formed to have a length extending substantially over the entire plowing width, and includes a rear engaging portion 27Ag and a mid-way engaging portion 27Ah.
A plurality of short ones are provided at intervals in the plowing width direction.

Each engaging portion 27 is provided on the inner surface of the rear plate cover 12.
Locking part 227Bf corresponding to Af, 27Ag, 27Ah
, 27Bg, 27Bh and a retaining portion 31 are formed. Further, side engaging portions 27Al are formed on the left and right sides of the outer surface of the rear plate cover corresponding portion 27, and continuous side engaging portions 27Al are formed in the front, rear, and midway portions, and the notch engaging portions 27 are also formed on the sides of the triangular notch 18.
Am is formed, and correspondingly, engaging portions 27Bl and 27Bm are formed on the rear plate cover 12. The rear plate cover corresponding part 27 engages with the locking part 27B from the rear except for the side engaging part 27Al.
27Al is engaged with the locking portion 27Bl from the left and right outer sides.

Since the elastic cover 14 has a protruding engaging portion A between it and the plate cover 15, a gap C is formed by approximately the amount of protrusion of the engaging portion A. Since there is no need to slacken the elastic cover 14 for this reason, the side of the elastic cover 14 facing the tilling section 8 can be in a polygonal shape but in a tensioned state, and that side can be kept in a tensioned state by the tilling section 8 without a protrusion. It has a smooth surface that roughly follows the
The soil and stones thrown away from the tilling claws 7 flow smoothly, and the generation of stuck soil is prevented by the sliding resistance.

Next, a method of manufacturing the elastic cover 14 will be explained. In the first embodiment shown in FIG.
A flat elastic cover material 38 in an unvulcanized (including semi-vulcanized) state is prepared in advance by sandwiching the hood cloths forming the hood and joining them together. Separately, an engaging portion material 39 is formed by making raw rubber into a hook block shape. still,
Although the side ribs 26Ak have different shapes, they are one of the engaging portion materials 39.

The elastic cover material 38 is inserted into the vulcanization mold 41, and a required number of engaging portion materials 39 are arranged on the front, back, and midway portions of its surface, and each engaging portion material 39 is The core 40 is arranged so as to fill the portion where the matching groove a is formed. The core 40 may have the same shape as the engagement groove a, instead of having a hook shape. After arranging the elastic cover material 38 and the required number of engaging portion materials 39 in the vulcanization mold 41, the vulcanization mold 41 is closed and vulcanized. This is vulcanized and bonded to form an elastic cover 14 having a required number of engaging portions A.

In the second embodiment shown in FIG.
It is divided into three parts. Further, the intermediate body 43 consists of three parts: a central body 43A and left and right intermediate bodies 43B. The vulcanization mold 41 consists of upper and lower molds 41U and 41D,
A flat cavity is formed in the lower mold 41D, and the upper mold 41U
Although a recess 44 is formed in which the engaging portion material 39 and core 40 are placed, the recess 44 may be formed in the lower mold 41D.

As shown in FIG. 4, the left and right side bodies 42, the center body 43A, and the left and right intermediate bodies 43B are connected to the elastic cover 1.
4 is divided into five parts: left and right side parts L, left and right intermediate parts M, and center part N. Materials such as the engaging part A and side ribs 26Ah and cores corresponding to each part are formed. It has a recess 44 in which 40 is placed. central body 4
3A is formed with a recess 45 in which a material for forming the notch engagement portion 27Am is placed, and for the left and right intermediate bodies 43B, replacement intermediate bodies 46 with different left and right widths are prepared, and these are used for replacement. By this, the vulcanization mold 41
The horizontal length of the elastic cover 14 is changed, and the elastic cover 14 has different widths.
is formed.

In the vulcanization mold 41 of the second embodiment, the center body 43A and the left and right intermediate bodies 43B may be integrated into one body without being separated, and a plurality of intermediate bodies 43 having different widths may be prepared. Alternatively, only one lower mold 41D with the maximum width may be prepared, and when molding a narrow elastic cover 14, spacers may be placed on the left and right sides of the divisible upper mold 41U. In the elastic cover 14 shown in FIGS. 3 and 4, the main plate cover corresponding part 26 and the rear plate cover corresponding part 27 are integrally formed, that is, integrally formed from the front end to the rear end of the plate cover 15, but they are formed separately. You can also. Such a separate elastic cover 14 can also be manufactured by the method of the present invention shown in FIGS. 1 and 2. This is useful for making it possible to remove the rear plate cover 12 for multi-purpose work or the like.

However, in order to separate the front and rear elastic covers 14, it is necessary to make a good joint between the main plate cover corresponding part 26 and the rear plate cover corresponding part 27 to prevent muddy water from entering. Two examples of elastic covers 14 that achieve this are shown in Figure 9.
10. In the first modification shown in FIG. 9, a tongue piece 47 is made to protrude from the rear plate cover corresponding part 27 side and is brought into contact with the main plate cover corresponding part 26 side, and this tongue piece 47 connects both parts 26, 2.
7 gaps are covered. In this case, the engagement direction of the engagement portion 27Af is opposite to that of the engagement portion 27Ah.

In a second modification shown in FIG. 10, an extension part 48 is projected from the rear plate cover corresponding part 27 side to the main plate cover corresponding part 26 side, and an engaging part 48A provided on this extension part 48 is connected to the main plate cover 11. It engages with a locking portion 48B provided at the rear end. The extension portion 48 has a slack portion, and the engagement portion 48A
The direction of engagement is opposite to that of the engagement portion 27Ah. FIG. 11 shows a first comparative example of an elastic cover mounting structure, in which a rib 51 having a U-shaped cross section is attached to the inner surface of the plate cover 15, and a washer 52 having a U-shaped cross section is embedded in the elastic cover 14, and the washer 52 is embedded in the elastic cover 14. It is fastened with bolts 53 (or rivets). The head of the bolt 53 is located within the washer 52 so as not to protrude to the inner surface of the elastic cover 14. Although this mounting structure is strong and has little damage to the bolts 53, it is more troublesome to attach and detach than the attachment using the engaging portion A.

FIG. 12 shows the second structure for attaching the elastic cover.
A comparative example is shown in which a nut 54 is embedded in the elastic cover 14, and a bolt 53 is screwed into the nut 54 from above the plate cover 15. Although this attachment structure causes less damage to the bolts 53, it is difficult to apply when the plate cover 15 has a double structure, and attachment and detachment work is more troublesome than attachment using the engaging portion A.

FIG. 13 shows an application example of the front cover mounting structure, in which the front cover 13 made of elastic material is attached to the main plate cover 1.
The structure in which the main plate cover 11 is attached to the front part of the upper wall 11a through the restraining plate 29 and bolts 30 can also be applied to a rotary cover device in which the elastic cover 14 is not provided on the inner surface of the main plate cover 11.

[0033]

According to the present invention described in detail above, the elastic cover 14 engages with the locking portion B on the inner surface of the plate cover 15 at the front, back, and midway portions of the surface of the unvulcanized flat elastic cover material 38. Unvulcanized engaging portion materials 39 forming the required number of engaging portions A are placed via a core 40, and these are placed in a vulcanization mold 4.
Since the elastic cover 14 is vulcanized and bonded within the elastic cover 14, even an elastic cover 14 having a protruding engaging portion A can be manufactured easily.

[0034] In addition, an uncured mold is placed in a vulcanization mold 41 which is divided into three parts in the left and right direction, the left and right side bodies 42 and an intermediate body 43, and the intermediate body 43 can be changed to one having different lengths in the left and right direction. In order to form a required number of engaging parts A that engage with the flat plate-shaped elastic cover material 38 and the engaging parts B on the inner surface of the plate cover 15, cores 40 are provided at the front, back, and midway portions of the surface of the elastic cover material 38. Since the unvulcanized engaging portion material 39 disposed through the vulcanized material 39 is inserted and vulcanized and bonded, even if the elastic cover 14 has different left and right widths, most of the vulcanization mold 41 can be used. , it can be manufactured at low product cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a second embodiment of the present invention.

FIG. 3 is a cross-sectional side view of the entire elastic cover manufactured according to the present invention.

FIG. 4 is a plan view of the elastic cover.

FIG. 5 is a sectional view of the elastic cover.

FIG. 6 is a perspective view of the front part of the elastic cover.

FIG. 7 is a side view of the rotary tiller.

8 is an enlarged sectional view of section K in FIG. 3. FIG.

FIG. 9 is a sectional view showing a first modification in which the elastic cover is divided into front and rear halves.

FIG. 10 is a sectional view showing a second modification in which the elastic cover is divided into front and rear halves.

FIG. 11 is a sectional view showing a first comparative example of an elastic cover mounting structure.

FIG. 12 is a sectional view showing a second comparative example of an elastic cover mounting structure.

FIG. 13 is a sectional view showing an application example of the front cover mounting structure.

[Explanation of symbols]

1 Rotary tiller 5 Rotary machine frame 8. Cultivation Department 10 Cover device 11 Main plate cover 12 Rear plate cover 14 Elastic cover 15 Board cover 26 Main plate cover compatible part 27 Rear plate cover compatible part C Gap 38 Elastic cover material 39 Engagement part material 40 Core 41 Vulcanization mold 42 Lateral body 43 Intermediate body 46 Exchange intermediate

Claims (2)

[Claims] [Claim 1] A board cover (15) covering the tilling section (8).
), the front and rear and middle parts of which are attached to the inner surface of the rotary tiller with a gap (C) in between, the surface of the unvulcanized flat elastic cover material (38) Board cover (15) at the front, back and middle of the
The required number of engaging portions (A) that engage with the locking portion (B) on the inner surface.
The unvulcanized engaging part material (39) forming the core (40
) and vulcanizing and adhering these in a vulcanizing mold (41). [Claim 2] A board cover (15) covering the tilling section (8).
) along the inner surface of the rotary tiller with a gap (C) in between, and the front, rear and midway parts thereof are attached. ) is divided into three parts and the intermediate form (4
The unvulcanized flat elastic cover material (3) is placed in a vulcanization mold (41) that can be used by changing the length of the material (3) in the left and right direction.
8), and in the front, back, and midway portions of the surface of the elastic cover material (38) to form the required number of engaging portions (A) that engage with the locking portions (B) on the inner surface of the plate cover (15). Child (40)
A method for producing an elastic cover for a rotary tiller, characterized by inserting an unvulcanized engaging portion material (39) disposed through the material, and vulcanizing and adhering these.