Hammer tool

Patent metadata

Field	Value
Publication number	US-12269152-B2
Application number	US-202217948909-A
Country	US
Kind code	B2
Filing date	Sep 20, 2022
Priority date	Sep 20, 2022
Publication date	Apr 8, 2025
Grant date	Apr 8, 2025

Abstract

A tool for a hydraulic hammer of a work machine is disclosed herein. The tool comprises a spline section and a tool section. The spline section includes a first spline sector including at least six spline grooves and a second spline sector including at least six spline grooves. The first spline sector and second spline sector are separated by a spacer. The tool section diameter is 3.2-4.8 times larger than the spline groove diameter and the tool section diameter is smaller than a spline section diameter.

First claim

What is claimed is:

1. A hammer assembly comprising:
a hammer;
a hammer housing; and
a work chamber in the hammer housing having a plurality of splines, a locking ring, a retainer ring, a hammer tool removably insertable in an opening in the hammer housing and into the work chamber,
wherein the hammer tool includes:
a spline section, and
a tool section,
wherein the spline section of the hammer tool includes:
a first spline sector including at least six spline grooves, and
a second spline sector including at least six splines,

wherein the first spline sector and the second spline sector are separated by a spacer,
wherein the tool section has a tool section diameter,
wherein the first spline sector and the second spline sector are larger in diameter than the tool section diameter,
wherein the tool section diameter is smaller than a spline section diameter,
wherein each of the at least six splines of the second spline sector of the spline section transitions directly into the tool section, sloping from the spline section diameter to the tool section diameter,
wherein the tool section diameter is 3.2-4.8 times larger than a spline groove diameter of each of the spline grooves,
wherein the locking ring separates a first set of splines of the hammer housing from a second set of splines of the hammer housing,
wherein the locking ring is a ring having locking indents disposed across an interior of the locking ring and is configured to rotate around the spacer between a locked state and an unlocked state, whereby the locked state couples the hammer tool to the hammer housing,
wherein the locking indents are one chosen from the group consisting of pyramidal, squared, and trapezoidal, and
wherein the plurality of splines are cylindrical wear rods each having a circular cross-section at least at ends thereof facing toward the locking ring.

2. The hammer assembly of claim 1 , wherein
the first spline set has 6-12 splines and the second spline set has 6-12 splines, and
the first spline sector has 6-12 spline grooves configured to receive the first spline set and the second spline sector has 6-12 spline grooves configured to receive the second spline set.

3. The hammer assembly of claim 2 , wherein the first spline sector and the second spline sector are each configured to receive the first set of splines and the second set of splines, respectively.

4. The hammer assembly of claim 3 , wherein the first set of splines received by the first spline sector of the hammer tool are axially aligned with the second set of splines received by the second spline sector of the hammer tool.

5. The hammer assembly of claim 2 , the hammer assembly is connected to a bracket of a work machine, the work machine including:
a frame;
a ground engaging element supporting the frame;
an engine in the frame and powers the work machine;
a working mechanism extending from the frame;
a hydraulic circuit; and
the bracket being on an end of the working mechanism.

6. The hammer assembly of claim 1 , the tool section includes a tool tip opposite the spline section, and the tool tip is chosen from the group consisting of a chisel point, a moil point, a conical point, a spade, a compaction plate, and a wedge.

7. The hammer assembly of claim 6 , the plurality of splines of the work housing are configured to allow the hammer tool rotate about a central axis of the hammer tool.

8. The hammer assembly of claim 6 , the hammer assembly is hydraulically powered.

9. A method of securing and maintaining a hammer tool to a hammer assembly of a work machine, the method comprising:
providing the hammer assembly including a hammer housing and the hammer tool, the hammer housing including a hammer and a work chamber for receiving the hammer tool through an opening of the hammer housing, the work chamber having a plurality of splines and a locking ring;
configuring the hammer tool to have a spline section and a tool section, the spline section including a first spline sector having at least six spline grooves and a second spline sector having at least six spline grooves, the first spline sector and the second spline sector being separated by a spacer, and the tool section having a smaller diameter than the spline section, the first spline sector, and the second spline sector, each of the at least six spline grooves of the second spline sector of the spline section transitioning directly into the tool section and sloping from the spline section diameter to the tool section diameter, and the tool section diameter is 3.2-4.8 times larger than a spline groove diameter of each of the spline grooves;
inserting the hammer tool into the work chamber through the opening in the hammer housing; and
rotating the locking ring around the hammer tool until in a locked state,
wherein the locking ring separates a first set of splines of the hammer housing from a second set of splines of the hammer housing,
wherein the locking ring is a ring having locking indents disposed across an interior of the locking ring and is configured to rotate around the spacer between a locked state and an unlocked state, whereby the locked state couples the hammer tool to the hammer housing,
wherein the locking indents are one chosen from the group consisting of pyramidal, squared, and trapezoidal, and
wherein the plurality of splines are wear rods having a circular cross-section at least at ends thereof facing toward the locking ring.

10. The method of claim 9 , the method further comprising:
operating the hammer assembly until the hammer tool is worn;
rotating the locking ring around the hammer tool until in an unlocked state;
removing the hammer tool from the work chamber through the opening and out of the hammer housing;
inserting a second hammer tool into the work chamber through the opening in the hammer housing; and
rotating the locking ring around the replacement hammer tool until in a locked state.

11. The method of claim 9 , the method further comprising:
operating the hammer assembly with a tool tip of the hammer tool until the tool tip is chipped; and
rotating the hammer tool so the tool tip is in a new chisel angle direction during operation of the hammer assembly.

12. A hammer assembly comprising:
a hammer;
a hammer housing; and
a work chamber in the hammer housing having a plurality of splines, a locking ring, a retainer ring, a hammer tool removably insertable in an opening in the hammer housing and into the work chamber,
wherein the hammer tool includes:
a spline section, and
a tool section,
wherein the spline section of the hammer tool includes:
a first spline sector including at least six spline grooves, and
a second spline sector including at least six splines,

wherein the first spline sector and the second spline sector being are separated by a spacer,
wherein the tool section has a tool section diameter,
wherein the first spline sector and the second spline sector are larger in diameter than the tool section diameter,
wherein the tool section diameter is smaller than a spline section diameter,
wherein the spline section transitions directly into the tool section, sloping from the spline section diameter to the tool section diameter,
wherein the tool section diameter is 3.2-4.8 times larger than a spline groove diameter of each of the spline grooves,
wherein the locking ring is a ring having locking indents disposed across an interior of the locking ring and is configured to rotate around the spacer between a locked state and an unlocked state, whereby the locked state couples the hammer tool to the hammer housing,
wherein the locking indents are one chosen from the g

Assignees

• Caterpillar Inc

Inventors

• Moore Cody

Classifications

• B60Y2200/41

  Construction vehicles, e.g. graders, excavators · CPC title

• B25D2217/0007

  Shaft ends · CPC title

• B25D2216/0076

  Angular position of the chisel modifiable by hand · CPC title

• B25D17/08

  Means for retaining and guiding the tool bit, e.g. chucks {allowing axial oscillation of the tool bit (B25D17/005 takes precedence)} · CPC title

• B25D17/02 Primary

  Percussive tool bits {(drill bits for earth drilling E21B10/00)} · CPC title