MXPA99004507A - Tooth arrangement - Google Patents

Abstract

At their lower edge (6) excavators are provided with a tooth arrangement consisting of two parts (1 and 2), one part (2) being attached to the bucket (6) and the other part (1) being exchangeable. The two parts (1 and 2) are held together by means of a male and female relationship and a transverse aperture (3 and 25) with a locking body (4). When the exchangeable part (1) becomes worn it may start to become unstable. The object of the present invention is to eliminate this drawback and this is achieved in that the locking body (4) comprises two opposing flat surfaces, provided with one or more spacers (15-20) intended to restrict approach of the two surfaces towards each other.

Description

TOOTH DISPOSITION DESCRIPTION OF THE INVENTION The present invention relates to a tooth arrangement used in excavators, for example, attached to the lower edge of the bucket. The tooth arrangement consists of two parts, a part being attached to the bucket of the excavator through welding or other means, and constituting a male part. The other part of the tooth arrangement, which is the part that really works the earth, is the female part. The two parts are joined together and, when joined together, produce a transverse opening that runs through the arrangement. A closure body is then placed in said opening. It has been found that when the interchangeable working part of the tooth arrangement wears out, it becomes unstable due to the properties of the transverse opening and the closure body. The object of the present invention is to eliminate said instability and this is achieved by using an opening composed of an intermediate part and two identical end portions of the same width, the intermediate part, however, having a larger width. A closure body is developed for this opening, said body comprising two elongated portions located parallel to each other and having flat surfaces opposite one another. The width of the closure body is adapted along its length to be fixed to said opening. The two flat surfaces are provided with one or more spacers directed outwardly restricting the approach of the two flat surfaces. The space between the two flat surfaces is filled with an elastic material, such as vulcanized rubber. It has been found advantageous to provide each of the two parts of the closure body with a spacer at each end and a spacer therebetween. In this way the approach of the surfaces towards one another is restricted, thus eliminating the disadvantage of an unstable part of the tooth arrangement. It is advisable that the tip of the male part have a cross section in the shape of T, so that the tip is as stable as possible and so that the innermost end of the female part is designed to be fixed to the tip of the male part , so that the two parties assume a position in relation to each other, which remains as motionless as possible. The instability of the interchangeable part relative to the fixed part in this way is also reduced. The present invention will now be described in more detail with reference to the accompanying drawings, in which: Figures 1-2 show a complete tooth arrangement viewed from two different directions; Figures 3-4 reveal the relationship between the closure body and the transverse opening, certain parts of the interchangeable part having been removed; Figures 5-6 show the interchangeable part in the tooth arrangement; Figures 7-8 show the non-interchangeable part of the tooth arrangement; Figure 9 shows the closure body with the elastic material; Figure 10 shows the closure body without the elastic material: Figures 11-12 show the two fixed parts in the closure body; Figure 13 shows a cutter provided with tooth arrangements according to the present invention; Figure 14 shows the opening in the female part; Figure 15 shows the tip of the male part; and Figures 16-18 show the female and male parts joined together. The drawings show a tooth arrangement 5 comprising a male part 2 intended to be welded to a cutter or to the edge of an excavator bucket 6. Said male part is provided with a tip 26 to be inserted into an opening 24 in the female part 1. The female part 1 is a part to work the earth, which can be exchanged when it wears out. The male and female parts form an opening 3 located on each side of the inserted tip 26. Between these two openings 3 is an intermediate opening. The two openings 3 are identical and are arranged immediately opposite each other in two side walls of the female part. Between the two openings, the upper surface of the tip 26 of the male part 2 forms part of the intermediate opening 25 and the remaining part of the intermediate opening 25 is formed by the intermediate wall portions located between the side walls of the female part 1. The two openings 3 are narrower than opening 25. Openings 3 are formed in wall portions 22 and 23. A closure body 4 is placed in opening 3 and 25, this body comprises two metal parts 7 and 8, each one having opposite flat surfaces. Each part 7 and 8 is provided with an intermediate part 9 and 10, respectively, and two end parts 11, 12 and 13, 14, respectively. The two flat surfaces are provided with separators. In this way, the part 7 has spacers 16 and 17 at its ends 11 and 12 and a spacer 15 at its intermediate part 9. As the part 8, it is provided with spacers 18 and 19 at its ends 13 and 14 and with a separator 20 in its intermediate part 10. The space between the surfaces the bar-like parts shown in Figure 10 is filled with an elastic material, which may consist of vulcanized rubber. The closure body 4 shown in Figure 9 in this manner can be influenced in such a way that both flat surfaces of the parts 7 and 8 can move towards and away from each other. However, parts 7 and 8 can never get close to each other to stay in contact. The separators ensure that, at maximum compression, the two flat surfaces will follow at some distance from each other. If the closure body 4, according to Figure 9, is inserted into the opening 3 and 25, the two parts 7 and 8 will be compressed so that the closure body can be inserted through the opening 3. When the The closure body is fully inserted into the opening 3 and 25, the two parts 7 and 8 will move so that the intermediate part of the closure body fits the opening 25 and the ends to the openings 3. When a tooth arrangement is in operation, parts 7 and 8, of course, will come close. However, thanks to the spacers, the closure body will have such a width that any instability in the interchangeable part of the tooth will be avoided. Another contribution to avoid instability in the interchangeable part may be that the tip 26 of the male part has a cross section in the T-shape and that the cross section has been made as solid as possible. This can be achieved, for example, by making the straight part of the T as long as possible and as wide as possible and by adapting the innermost end 24 of the opening of the female part to the tip 26 of the male part, so that the walls of the female part at the tip of the male part meet the tip of the male part as hermetically as possible Since the tip of the male part has a cross section in the shape of T and the innermost part in the opening in the female part is configured to fix this T-shaped cross section, it is obvious that the transverse parts of the bar of the T will be clamped between the two surfaces within the innermost part of the female part and the real tooth can be used rather considerably from the bottom without falling off the male part. Figures 14-18 show the real core of the tooth arrangement, that is, both the parts of attachment to a cutter and the same part of the tooth have been removed. The real core part can be used in any type of joint part and together with any type of tooth part. The Figures thus show only the region of the tooth arrangement containing the tip of the male part and the opening of the female part, and the transverse opening with the closure body. It has already been explained that the male part 26 has a cross section in the form of a large T. The cross section in this way has a straight part and two crossed bars directed outward, which can be considered to form a fork. The lower side of each cross bar is machined in such a way that it acquires the character of an inclined surface forming an angle with the center line of the two bars in such a way that the surface has a shorter distance to said center line in a straight line since a longer distance at the outermost end of the bar. The interior of the female body is correspondingly configured so that when the male and female parts are joined, these inclined surfaces will function as a closing device for the male and female body, thus allowing increased wear of the real tooth from below, without Male and female parts separate from each other. These two inclined surfaces, of course, can be replaced with other types of surfaces by performing the same function, that is, by preventing the male and female parts from separating from each other due to wear.

Claims (3)

1. - A tooth arrangement consisting of a male part (2) and a female part (1) for joining a moving body (6) in the form of a cutter, the edge of an excavator or the like, wherein the female part (1) is interchangeable, wherein the male part (2) is attached to the mobile body, wherein the male part (2) and the female part (1) together form a transverse opening (3 and 25) wherein the two parts external parts of the running opening are arranged in the walls of the female part (1) and where the intermediate part (25) of the transverse opening (3 and 25) is arranged in the male part (2), wherein the part male (2) and female part (1) are held together through a longitudinal closure body (4) placed in the running opening, characterized in that the external parts (3) of the opening have the same dimension, which is smaller than the dimension of the intermediate opening (25), since the closure body (4) comprises two parallel parts s (7 and 8), each with a flat surface, said flat surfaces being opposed to each other and provided with one or more spacers directed outwards (16-19), the elastic material (21), such as vulcanized rubber, is arranged between the opposed flat surfaces, the ends of the closure body (4) have a dimension to cooperate and make contact with the external openings (3), the intermediate part of the closure body has a dimension that cooperates with and is in contact with each other. with the intermediate part (25) of the opening and the tip of the male part (2) is in close contact with the walls of the female part (1).

2. A tooth arrangement according to claim 1, wherein each of the two parts (7 and 8) of the closure body is provided with a separator (16, 17 and 18, 19, respectively) at each end. and one or more spacers (15 and 20) on the intermediate part (9, 10, respectively).

3. A tooth arrangement according to claim 1, wherein the tip (26) of the male part (2) has a cross section in the T-shape and the internal wall of the female part (1) is designed to fix the cross section of the male part (2).