Boom for linkage assembly of machine with fork reinforcement plate

• US 9,376,783 B2
• Filed: 07/28/2014
• Issued: 06/28/2016
• Est. Priority Date: 07/28/2014
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Ulrich, William J., Lyu, Naesung, Appalla, Balasubramanyam, Forck, James A.
• Primary Examiner(s): McClain, Gerald
• Application Number:
  US14/444,514
• Publication Number:
  US 20160024743A1
• Time in Patent Office: 701 Days
• US Class Current: 1/1
• CPC Class Codes: E02F 3/32 working downwardly and towards the machine, e.g. with backhoes
• CPC Class Codes: E02F 3/38 Cantilever beams , i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms for booms with cable suspension arrangements E02F9/14 takes precedence; Dipper-arms , e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms E02F3/34 takes precedence

Abstract

A boom for a linkage assembly of an implement system includes a boom body and a fork reinforcement plate. The boom body includes a pair of sidewalls, a top portion, and a bottom portion. The top portion and the bottom portion extend between the pair of sidewalls. The top portion and the bottom portion define a boom nose at a distal body end. The sidewalls each include a fork portion disposed at the distal body end and extending in outward relationship to the boom nose. Each fork portion defines therein a stick mounting opening. The fork reinforcement plate is connected to the inner surface of one of the pair of sidewalls at the fork portion. A proximal plate end of the fork reinforcement plate is in abutting relationship with the boom nose.

Claims

1. A boom for a linkage assembly of an implement system, the boom comprising:

a boom body, the boom body having a proximal body end and a distal body end, the boom body including a pair of sidewalls, a top portion, and a bottom portion, the pair of sidewalls in lateral spaced relationship to each other, the pair of sidewalls each including an inner surface in confronting relationship with each other, the top portion extending between the pair of sidewalls, the bottom portion extending between the pair of sidewalls, the top portion and the bottom portion defining a boom nose at the distal body end of the boom body, the pair of sidewalls, the top portion, the bottom portion, and the boom nose defining an interior cavity, the pair of sidewalls each including a fork portion disposed at the distal body end and extending in outward relationship to the boom nose, each fork portion defining therein a stick mounting opening; and

a fork reinforcement plate, the fork reinforcement plate connected to the inner surface of one of the pair of sidewalls at the fork portion, the fork reinforcement plate including a proximal plate end and a distal plate end, the proximal plate end of the fork reinforcement plate being in abutting relationship with the boom nose;

wherein the fork reinforcement plate defines a pin opening, the pin opening in aligned relationship with the stick mounting opening of the one of the pair of sidewalls to which the fork reinforcement plate is connected;

wherein the fork reinforcement plate includes a perimeter having a pair of tip segments, the pair of tip segments converging together at the distal plate end to define a tip disposed at the distal plate end of the fork reinforcement plate;

wherein the perimeter of the fork reinforcement plate includes a pair of tail segments, the pair of tail segments respectively adjoining the pair of tip segments and converging toward each other moving from the pair of tip segments toward the proximal plate end of the fork reinforcement plate;

wherein the pair of tip segments of the fork reinforcement plate define a tip angle therebetween, and the pair of tail segments of the fork reinforcement plate define a tail angle therebetween, the tip angle being greater than the tail angle.

2. The boom for a linkage assembly according to claim 1, wherein the boom body is substantially free of structural weldments disposed within the interior cavity of the boom body.

3. The boom for a linkage assembly according to claim 1, wherein the fork reinforcement plate comprises a first fork reinforcement plate, and the boom further comprises a second fork reinforcement plate, the second fork reinforcement plate connected to the inner surface of the other of the pair of sidewalls at the fork portion, the second fork reinforcement plate including a proximal plate end and a distal plate end, the proximal plate end of the second fork reinforcement plate being in abutting relationship with the boom nose.

4. The boom for a linkage assembly according to claim 1, wherein the pair of tip segments of the fork reinforcement plate define a tip angle therebetween, the tip angle being in a range between 40°

and 60°

.

5. The boom for a linkage assembly according to claim 1, wherein the pair of tail segments of the fork reinforcement plate define a tail angle therebetween, the tail angle being in a range between 10°

and 30°

.

6. The boom for a linkage assembly according to claim 1, wherein the perimeter of the fork reinforcement plate includes a proximal segment, the proximal segment disposed between the pair of tail segments at the proximal plate end of the fork reinforcement plate, the proximal segment being concave and being in abutting relationship to a portion of the boom nose and having a complementary shape thereto.

7. A machine comprising:

a frame, the frame including a power system configured to supply power to the machine and an operator station configured to selectively operate the machine; and

an implement system pivotally connected to the frame, the implement system in operable arrangement with the power system and the operator station such that the implement system is selectively movable by the operator station from power supplied by the power system, the implement system including a boom pivotally coupled to the frame, a stick pivotally coupled to the boom, and an implement pivotally coupled to the stick;

wherein the boom includes a boom body and a fork reinforcement plate;

the boom body having a proximal body end and a distal body end, the boom body including a pair of sidewalls, a top portion, and a bottom portion, the pair of sidewalls in lateral spaced relationship to each other, the pair of sidewalls each including an inner surface in confronting relationship with each other, the top portion extending between the pair of sidewalls, the bottom portion extending between the pair of sidewalls, the top portion and the bottom portion defining a boom nose at the distal body end of the boom body, the pair of sidewalls, the top portion, the bottom portion, and the boom nose defining an interior cavity, the pair of sidewalls defining a fork end at the distal body end of the boom body, the pair of sidewalls each including a fork portion disposed at the distal body end and extending in outward relationship to the boom nose, each fork portion defining therein a stick mounting opening; and

a fork reinforcement plate, the fork reinforcement plate connected to the inner surface of one of the pair of sidewalls at the fork portion, the fork reinforcement plate including a proximal plate end and a distal plate end, the proximal plate end of the fork reinforcement plate being in abutting relationship with the boom nose, the stick pivotally coupled to the boom at the fork end such that the stick is disposed inward of the fork reinforcement plate;

wherein the fork reinforcement plate defines a pin opening, the pin opening in aligned relationship with the stick mounting opening of the one of the pair of sidewalls to which the fork reinforcement plate is connected;

wherein the fork reinforcement plate includes a perimeter having a pair of tip segments, the pair of tip segments converging together at the distal plate end to define a tip disposed at the distal plate end of the fork reinforcement plate;

wherein the perimeter of the fork reinforcement plate includes a pair of tail segments, the pair of tail segments respectively adjoining the pair of tip segments and converging toward each other moving from the pair of tip segments toward the proximal plate end of the fork reinforcement plate;

wherein the pair of tip segments of the fork reinforcement plate define a tip angle therebetween, and the pair of tail segments of the fork reinforcement plate define a tail angle therebetween, the tip angle being greater than the tail angle.

8. The machine according to claim 7, wherein the fork reinforcement plate comprises a first fork reinforcement plate, and the boom includes a second fork reinforcement plate, the second fork reinforcement plate connected to the inner surface of the other of the pair of sidewalls at the fork portion, the second fork reinforcement plate including a proximal plate end and a distal plate end, the proximal plate end of the second fork reinforcement plate being in abutting relationship with the boom nose, the stick pivotally coupled to the boom at the fork end such that the stick is disposed between the first fork reinforcement plate and the second fork reinforcement plate.

9. The machine according to claim 7, wherein the boom includes a proximal boom pivot end, a stick actuator pivot bracket, and a boom actuator joint assembly, the boom pivotally connected to the frame at the proximal boom pivot end;

the stick includes a proximal stick actuator pivot end and an implement actuator pivot bracket; and

the implement system includes a boom actuator, a stick actuator, and an implement actuator, the boom actuator pivotally connected at a proximal end thereof to the frame and at a distal end thereof to the boom actuator joint assembly, the stick actuator pivotally connected at a proximal end thereof to the stick actuator pivot bracket of the boom and at a distal end thereof to the proximal stick actuator pivot end of the stick, and the implement actuator is pivotally connected at a proximal end thereof to the implement actuator pivot bracket of the stick and at a distal end thereof to the implement, the boom actuator, the stick actuator, and the implement actuator in operable arrangement with the power system and the operator station for selective movement thereof.

10. The machine of claim 9, wherein the implement comprises a bucket with a bucket linkage assembly, the distal end of the implement actuator being pivotally connected to the bucket linkage assembly.

11. The machine of claim 9, further comprising:

an undercarriage, the frame pivotally connected to the undercarriage, the undercarriage in operable arrangement with the power system to selectively propel the machine.

12. A method of making a boom for a linkage assembly of an implement system, the method comprising:

fabricating a boom body, the boom body having a proximal body end and a distal body end, the boom body including a pair of sidewalls, a top portion, and a bottom portion, the pair of sidewalls in lateral spaced relationship to each other, the pair of sidewalls each including an inner surface in confronting relationship with each other, the top portion extending between the pair of sidewalls, the bottom portion extending between the pair of sidewalls, the top portion and the bottom portion defining a boom nose at the distal body end of the boom body, the pair of sidewalls, the top portion, the bottom portion, and the boom nose defining an interior cavity, the pair of sidewalls each including a fork portion disposed at the distal body end and extending in outward relationship to the boom nose, each fork portion defining therein a stick mounting opening; and

connecting a fork reinforcement plate to the inner surface of one of the pair of sidewalls at the fork portion, the fork reinforcement plate including a proximal plate end and a distal plate end, the fork reinforcement plate connected such that the proximal plate end of the fork reinforcement plate is in abutting relationship with the boom nose;

wherein the fork reinforcement plate defines a pin opening, the pin opening in aligned relationship with the stick mounting opening of the one of the pair of sidewalls to which the fork reinforcement plate is connected;

wherein the fork reinforcement plate includes a perimeter having a pair of tip segments, the pair of tip segments converging together at the distal plate end to define a tip disposed at the distal plate end of the fork reinforcement plate;

wherein the perimeter of the fork reinforcement plate includes a pair of tail segments, the pair of tail segments respectively adjoining the pair of tip segments and converging toward each other moving from the pair of tip segments toward the proximal plate end of the fork reinforcement plate;

wherein the pair of tip segments of the fork reinforcement plate define a tip angle therebetween, and the pair of tail segments of the fork reinforcement plate define a tail angle therebetween, the tip angle being greater than the tail angle.

13. The method according to claim 12, wherein the boom body is fabricated by welding the pair of sidewalls to the top portion and to the bottom portion such that the interior cavity of the boom body is substantially free of structural weldments.

14. The method according to claim 13, wherein the boom body is fabricated such that the interior cavity is free of:

a transverse structural member that both extends between the pair of sidewalls and has a structural weldment disposed within the interior cavity of the boom body.

15. The method according to claim 12, wherein the fork reinforcement plate comprises a first fork reinforcement plate, and the method further comprising:

connecting a second fork reinforcement plate to the inner surface of the other of the pair of sidewalls at the fork portion, the second fork reinforcement plate including a proximal plate end and a distal plate end, the second fork reinforcement plate connected such that the proximal plate end of the second fork reinforcement plate is in abutting relationship with the boom nose.

16. The method according to claim 12, wherein the fork reinforcement plate includes a perimeter having a pair of tip segments, the pair of tip segments converging together at the distal plate end to define a tip disposed at the distal plate end of the fork reinforcement plate, and the perimeter of the fork reinforcement plate includes a pair of tail segments, the pair of tail segments respectively adjoining the pair of tip segments and converging toward each other moving from the pair of tip segments toward the proximal plate end of the fork reinforcement plate.