KR970001729B1 - Excavating tooth assembly - Google Patents

Abstract

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Description

Excavation Tooth Replacement Points

1 is a perspective view of US Pat. No. 4,355,532.

2 is a perspective view of US Pat. No. 4,761,900.

3 is a perspective view of the tooth portion of the present invention.

4 is a top plan view of the assembly device of the present invention.

FIG. 5 is a cross-sectional and partial side cross-sectional view of the FIG. 4 assembly with corresponding section along line 5-5 of FIG.

FIG. 6 is a cross-sectional view as shown along lines 6-6 as applied to FIG.

7 is a side view of the nose with points shown in non-impact and impact phase.

8 is a side view of the adapter nose portion of the embodiment of the present invention in FIGS.

9 is a side view of another embodiment of the present invention, similar to FIG. 8, wherein the nose face supported against the pin is an arc.

FIG. 10 is a perspective view of the nose of FIG.

11 is a perspective view of an alternative form of the point of the invention in which only one sidewall is mounted with the rearward extending means.

12 is a partial side cross-sectional view of a modified tooth assembly embodying the present invention.

* Explanation of symbols for main parts of the drawings

26,26: Ear 27: Socket

28,29: Lug 36,37: Lug Wall

40: Nose defect 41: Inclined surface

42: followed by 46: keeper opening

The present invention relates to an excavation tooth, in particular a point, which is an improvement of US Patent No. 4,761,900, which is an improvement of co-owned US Patent No. 4,353,532.

In U.S. Patent No. 4,761,900, a new locking system is provided to replace the U-type fasteners used in the trade name HELILOK tooth (see Patent No. 4,353,532, supra). The system of US Pat. No. 4,761,900 uses a drive through pin held in place by a plug member or cover that extends transversely, ie horizontally, so as not to be stressed by the impact rod. The vertical locking pins described in patent 4,761,900 are clamped in place by ear lugs on point rears that interact with a pair of vertically spaced ears on the adapter. These are engaged to hold the pin with the arch shape in the rear, ie the convex side towards the rear.

It has been found that significant improvements in operation can be achieved by using a pair of vertically spaced ear lugs on the point ear, despite the pin convexity.

Although using discrete ear rigs on points, point and nose assembly geometries have been developed that provide improved life of the nose. The life of any excavated tooth system nose is generally determined by two types of failure: .

1. Destruction of the nose that holds the point, which is caused by the wear of the nose that loosens or breaks the point too loosely causing the fit of the point on the nose during use.

2. The structural destruction of the nose by fatigue.

The improved nose life provided by the point and nose structures of the present invention is caused by reducing the causes of both types of destruction.

With regard to nose wear, the structure of the present invention provides a longer bearing surface (bearing surface), thereby reducing the bearing pressure of the point on the nose, thereby lowering the nose wear rate and loosening the point fit. It also provides a locking type bearing at the point that holds the pin against the nose, thereby reducing wear of the pin bearing face on the nose. The pin of U.S. Patent No. 4,761,900 rubs the nose ear through the up and down micro-movement induced by the point under load, but the spaced ear lugs of the present invention point can absorb the movement of the point caused by locking. Allow pin shape. This locking movement has a slower wear rate compared to the wear rate of the pin support surface of the nose of U.S. Patent No. 4,761,900, as in the relationship of rolling wheel to sliding block. In addition, the structure of the present invention allows the rear side wall of the point to completely protect the nose pin support surface and pin from all external wear, ie from rough soil and rock while the tooth system is excavating.

It is obvious that a tight fit is desirable for keeping the point on the adapter in place. Despite this fact, there is a relative movement of the point relative to the adapter nose under high effect (see US Pat. Nos. 2,919,506 and 3,079,710). The basic heli-lock tooth system of US Pat. No. 4,335,543 can support points on the nose after a significant amount of loosening occurs from nose wear. In this respect the tooth system of US Pat. No. 4,761,900 and the tooth system of the present invention are superior to other tooth systems. However, there is a limit of looseness, which changes inversely depending on the application, and beyond this limit the tooth system cannot support the point. The tooth of the present invention is directed to extending the life before reaching this limit.

With regard to nose fatigue failure, the use of spaced ear lugs on a point can eliminate the ear protruding on the nose. This protruding ear may be a stress concentration source. Therefore, the removal of the protruding ears not only allows longer support surfaces but also provides greater nose fatigue strength. These two advantages compensate for the slight material loss in the nose by providing a flaw for the new side lock pins.

These advantages are achieved by obtaining a larger point on the nose bearing length while achieving tighter fit over the adapter life and stress concentration at the critical junction of the shank and the nose of the adapter.

Points with vertically spaced and rearwardly extending ear portions are already used in Applicant's US Patent No. 4,326,348, where the ear function is to stabilize by interaction with the ear cap,

The prior art forms the locking pin in its original locked position and does not describe the beneficial action of the spaced rear extension ear means.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Referring to FIG. 1, the U.S. Patent No. 4,353,532 shows a HELILOK tooth. It consists of the point A, the adapter B which has a nose part, and the U type lock C. As shown to FIG. This tooth structure has the advantage of providing a more powerful nose due to the absence of the locking pin opening.

However, there is a difficulty in removing the U-shaped lock C, but this is overcome by the use of the drive-through pin C ′ of US Pat. No. 4,761,900 shown in FIG. An advantage of this patent 4,761,900 is the use of an unstressed keeper or cross plug (D). The tooth point of FIG. 2 is the same as that of FIG. 1, and is designated by reference numeral A. FIG. However, the adapter nose of FIG. 2 is changed from the nose of FIG. 1, and the drive-through pin of FIG. 2 is designated as C '.

In accordance with the present invention, Applicants have changed all points, adapter noses and locking pins, which are designated A ', B' 'and C' ', respectively, and the keepers are designated D since they have not changed.

The present invention is based on the fact that the pin normally moves with the point when the point is under impact loading. This can be seen from the drawing shown in FIG. Here, the adapter nose is shown at 20 with a solid line. The locking pin is also shown in solid lines and is indicated at 21 in a non-impact situation. However, the tooth point is designated dashed line 22, which is also in a non-impact or static situation.

The downwardly directed impact rod or stress as indicated at 23 is pivoted to the dotted position indicated by 22 'in the form of a dotted line on the nose. This illustrates the aforementioned locking or rolling operation, which also provides the advantage of not wearing the front wall 24 of the nose groove supported on the middle of the pin 21 as shown in FIG.

Based on the fact that it is desirable for the pin to move with the point in the system under the structure, several changes have been made in the locking mechanism, the most important of which is to provide a pin support surface spaced on the point.

Point lugs supporting the pin can first be understood with reference to the third ones. In this embodiment, the sidewalls of point A 'provide ears 25 and 26 extending rearward beyond the socket 27. The rear end of the ear or means is provided with integral lugs 28 and 29 for the ear 25 and lugs 30 and 31 for the ear 26. The lug 29 is shown in the lower right of FIG. 4 and the lug 31 is shown in the upper right. All these lugs are shown in FIG. These lugs protrude inwardly, ie extend the length of the socket 27, ie approximately perpendicular to the interior of the tooth.

6, the vertical distance between the top 33 of the upper lug 31 and the bottom 32 of the lower lug 30 is the length of the rear diameter of the socket 27 having a circular cross section at the rear end, i. It is almost equal to the length of the diameter of the nose cone shown by the reference numeral E of FIGS.

This relationship provides the advantage of allowing the proper size of the integral lug in terms of structural strength and bearing area.

The inward faces 34, 35 of the lugs 30, 31, as shown in FIG. 6, are partially inclined surfaces provided with respect to the minimum tolerance of the nose coon face E of FIG. 28, 29). Therefore, this is also called inclined surface below. This is clearly shown in FIG. 6, where the face E ′ is an extension of the nose coon extending back to the region of FIG. 6. When twisting and disassembling points on the nose, the inward, beveled surfaces of the lugs easily assemble and disengage the nose coons and extensions E and E '. By engaging the circular socket / nose coon cross section with flat tall point ears of FIGS. 3-7, a space is arranged on the outer side of this inward boundary for a point ear lug of a suitable size.

In a particular invention, the inwardly inclined surface of the ear lug is an arc, but a satisfactory function can be achieved with a straight inclined surface.

Referring to FIG. 5, in a preferred configuration, the pair of forward facing lug walls 36, 37 may be partially recessed to provide a rigid engagement with the longitudinal separation zone of the block rear edge 38 of the pin 21. I make it to the surface. Only a pair of lugs are engaged with the pins on a given assembly, the other pair being installed at points in the 180 degree pivot direction. Turning the point when half worn out is sometimes performed when very sharp digging shapes are required.

Prior to assembly, the radius of the convex back edge 38 of the pin 21 is smaller than the radius of the pair of lug walls 36 and 37 of the arc or the pair corresponding to the lugs 28 and 29. Thus, if the pin 21 is located in contact with the lug walls 36 and 37 of the arc, but not assembled on the nose, the contact is located near the end of the lug face indicated by 32,33. . Upon assembly of the pin into the point and nose assembly, this contact of the pin on the lug wall of the arc is such that the pin is in contact with the front wall 24 of the nose groove 40, shown in the fifth, eight, and ten degrees. Since it is bent through the contact of the front convex edge 39, it contacts more widely. Finally, under the operating load received on the point during service, the pin can still be bent and, consequently, the radius of its concave rear edge 38 is equal to the lug wall 36, 37 of the arc for contact of the entire face. Coincides with the radius of.

Of course, the flexing of these pins provides a tight assembly force.

The operation (driving) of the pin into the point / nose assembly is easy since it is not disturbed by the inclined surface of the lug wall 36 facing forward, as indicated by reference numeral 41 in FIG. When the inlet end of the pin 21 passes past this inclined surface 41, the pin is deflected or bent to reach the forward facing lug wall 36.

Instead of using the ear 42 of FIG. 2 to support the new fin C, the present invention uses the front wall 24 of the nose groove 40 shown in FIGS. 4 and 5. The nose support surface is planar as in reference numeral 24 in FIG. 8 or slightly arcuate as in reference numeral C124 in FIG. 9 with respect to the groove 140. Normally, the pin is supported on the nose face indicated by reference numeral 24,124 near the longitudinal center-plane of the nose, but during the stress stress the support surface moves up and down the center-plane.

An integral ridge 43 is formed in the rear wall of the groove 40 in the nose as compared with FIGS. 3 and 4. These ridges are immersed in the nose and top and bottom, which can be seen by comparing the reference numerals 144,145 in FIG. 9 and 44, 45 in FIGS. 3 and 8 with respect to the ridge 143. The arc of the front wall 124 of FIG. 9 is tangent to the keeper opening 146 at the center point, in contrast to the relationship between the keeper opening 46 and the wall 24 of FIG. Here, the wall 24 has a groove 47 for adjusting the insertion of the keeper as shown in FIG.

The ridge 43 (or 143) acts as a guide during insertion of the locking pin. In this connection, it is suitable to use the single ear point structure of FIG. 11 with the nose of FIG. 9, and this tooth is mainly used for dredging and cannot be installed in or out. Here, the structure of the lugs 28 and 29 is the same as that of FIG. 3, but the ear means for providing the lugs 30 and 31 are omitted.

As mentioned above, pin C is different from pin C '(compare FIGS. 2 and 3), wherein the pin used at the point of the invention has a forward curve, ie it is normally curved. This facilitates the desired locking action to minimize nose wear in zone 24.

The locking pin 221 of another structure is shown in FIG. The point ear of this structure is the same length as the rear aperture of the point socket 27, but the forward facing lug walls 236 and 237 are not arcs. These lug walls are flat and parallel for use with sandwich type pins. This sand locating pin as used for many years in the art is a layered body of steel plates 248 and 250 forming a rubber core 249. This structure does not provide the benefit of locking engagement with the nose lock groove wall 224, but would be suitable for some light duty applications and would also provide the advantage of operating without a plug (D). Retention of the pins in the assembly is provided by engagement of the inward edges 236 and 237 of the lugs 228 and 229 with the rear protrusion 251 on the rear steel layered body 248. Here, the corresponding lugs are provided on both sides of the point, and likewise provided in the corresponding grooves on the nose.

While the detailed description of the invention has been provided above, modifications and variations may be made by those skilled in the art without departing from the spirit of the invention.

Claims (10)

A long integral body formed by a top, a bottom, and a pair of surveys, the front end having an edge that engages the ground and the rear end having an adapter nose receiving socket 27, wherein at least one of the side walls is a top and bottom wall. At the excavation tooth replacement point A 'extending rearward beyond, the rear extension sidewalls are vertically spaced top and bottom ear lugs 28,29 aligned to use locking pins 21 near the top and bottom. ; Excavation tooth replacement point using tweezing having 31, 32). The excavation according to claim 1, wherein each of the ear lugs (28, 29; 31, 32) extends inwardly at right angles to the socket (27) from the side wall to support the locking pin (21). Tooth replacement point. 3. The socket 27 according to claim 2, wherein the socket 27 has a circular section at the rear end, and the upper part 33 of the upper lug 29 and the bottom part 32 of the lower lug 28 are the diameter length of the circular section. Excavation tooth replacement point, characterized in that spaced apart. 3. Excavation tooth replacement point according to claim 2, characterized in that each lug (28,29) comprises inwardly inclined surfaces (34,35) at adjacent portions to match the shape of the socket (27). 5. The lug wall of claim 4, wherein each lug comprises forward facing lug walls 36, 37, wherein a portion of the lug wall 36 of the lower lug 28 adjacent the upper lug 29 slopes backwards. Excavation tooth replacement point is formed, characterized in that guide the locking pin during the installation of the locking pin (21). 2. Excavation tooth replacement point according to claim 1, characterized in that both side walls extend beyond the top and bottom walls, each side wall having the lugs (28,29). 2. Excavation tooth replacement point according to claim 1, characterized in that each lug comprises forward facing lug walls (36,37), said walls being arcs. 10. An excavation tooth replacement point according to claim 1, wherein each lug comprises forward facing lug walls (236,237), said walls being planar. 2. The nose of claim 1 wherein the nose at the combination of the point and the nose mounting adapter (B) comprises a vertical extension (40; 140) for receiving the locking pin (21) and a substantially vertically long locking pin in the groove. (21), the groove (40; 140) has a front wall (24; 124) that is in engagement with the intermediate portion of the locking pin (21), the point ear lugs (28, 29; 30, 31) is a digging tooth replacement point, characterized in that the locking pin is in engagement with the locking pin adjacent to the end. 10. The adapter (B) according to claim 9, wherein said adapter (B) has said locking pin (21), an alignment and horizontally extending opening (46), and an elastic keeper for the locking pin in said opening, said opening being inward from said fault. Excavation tooth replacement point, characterized in that extending to.

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