Coupling joint for the teeth of excavating machines

• US 5,918,391 A
• Filed: 06/19/1997
• Issued: 07/06/1999
• Est. Priority Date: 07/01/1996
• Status: Expired due to Term

• Current Assignee: Metalogenia, S.A., Hughes Electronics Corporation (Rtx Corporation)
• Original Assignee: Metalogenia, S.A.
• Inventors: Vinas Peya, Juan
• Primary Examiner(s): SHACKELFORD, HEATHER CHUN
• Application Number:
  US08/878,992
• Time in Patent Office: 747 Days
• Field of Search: 37/450, 37/452, 37/453, 37/454, 37/455, 37/456, 37/457, 37/458, 37/459, 37/460, 37/451
• US Class Current: 37/452
• CPC Class Codes: E02F 9/2825 using adapters
• CPC Class Codes: E02F 9/2833 Retaining means, e.g. pins

Abstract

The coupling joint has on the mating contact surfaces between the tooth and the tooth holder the following characteristics: the upper and lower surfaces which define the stabilisation planes comprise a substantially flat central surface and another two flat surfaces, one on each side of the said central surface, so that the interstice between the central flat surface and the corresponding facing surface of the tooth holder is smaller than the respective interstices between the lateral flat surfaces and the corresponding facing surfaces of the receiving cavity of the tooth; the upper and lower rear edges of the lugs of the tooth have a convex transverse structure; the internal vertical rear edge of the rear lugs of the tooth have surfaces of a shape matching the opposed faces of the tooth holder, giving rise to higher bearing surfaces in the case of transverse bearing on the tooth.

Claims

1. A coupling joint for the teeth of excavating machines, the coupling joint including a tooth and a tooth holder, the tooth holder including a projecting portion intended to fit into a cavity of the tooth and the coupling joint further including corresponding facing surfaces between the tooth and the tooth holder, the coupling joint comprising:

the tooth holder including upper and lower surfaces which define stabilization planes of the projecting portion, the upper and lower surfaces including a substantially flat central surface and two flat lateral surfaces, one on each side of the central surface, wherein the central surface and lateral surfaces are oriented so that the gap between the central surface and the corresponding facing surface of the tooth is smaller than the respective gaps between the lateral surfaces and the corresponding facing surfaces of the tooth;

the tooth including two lateral lugs extending from the rear edge of the tooth, for a predetermined length, the lateral lugs adapted to fit into corresponding lateral seatings of the tooth holder corresponding facing surfaces; and

the lateral lugs including upper and lower edges and internal vertical edges, each of the upper and lower edges including a convex transverse structure corresponding to an equivalent structure of the facing surface of the tooth holder and each internal vertical edge including a flat surface of equivalent structure to the corresponding facing surface of the tooth holder, wherein said convex transverse structure on said upper and lower edges have a constant radius along said predetermined length.

2. The coupling joint for excavating machines according to claim 1, wherein the convex transverse section of the upper and lower edges of the lateral lugs comprising an arched transverse shape.

3. The coupling joint for excavating machines according to claim 1, wherein the convex transverse section of the upper and lower edges of the lateral lugs comprising a mixed section based on straight zones and arched zones.

4. The coupling joint for excavating machines according to claim 1, wherein the flat surface of the internal vertical edges of the lateral lugs and the corresponding facing surfaces of the tooth holder include the same angle of inclination.

5. The coupling joint for excavating machines according to claim 4, wherein the flat surface comprises a chamfer.

6. A coupling joint for the teeth of excavating machines, the coupling joint including a tooth and a tooth holder, the tooth holder including a projecting portion intended to fit into a cavity of the tooth and the coupling joint further including corresponding facing surfaces between the tooth and the tooth holder, the coupling joint comprising:

the tooth holder including upper and lower surfaces which define stabilization planes of the projecting portion, the upper and lower surfaces including a substantially flat central surface and two flat lateral surfaces, one on each side of the central surface, wherein the central surface and lateral surfaces are oriented so that the gap between the central surface and the corresponding facing surface of the tooth is smaller than the respective gaps between the lateral surfaces and the corresponding facing surfaces of the tooth;

the tooth including two lateral lugs extending from the rear edge of the tooth for a predetermined length, the lateral lugs adapted to fit into corresponding lateral seatings of the tooth holder corresponding facing surfaces; and

the lateral lugs including upper and lower edges, each of the upper and lower edges including a convex transverse structure corresponding to an equivalent structure of the facing surface of the tooth holder, wherein said convex transverse structure on said upper and lower edges have a constant radius along said predetermined length.

7. A tooth for use in an excavating machine, the tooth coupled with a tooth holder to form corresponding facing surfaces between the tooth and the tooth holder and the tooth including, the tooth comprising:

two lateral lugs extending from the rear edge of the tooth for a predetermined length, the lateral lugs adapted to fit into corresponding lateral seatings of the tooth holder corresponding facing surfaces; and

the lateral lugs including upper and lower edges and internal vertical edges, each of the upper and lower edges including a convex transverse structure adapted to correspond to an equivalent structure of the facing surface of the tooth holder and each internal vertical edge including a flat surface of equivalent structure adopted to correspond to the facing surface of the tooth holder, wherein said convex transverse structure on said upper and lower edges have a constant radius along said predetermined length.