Rock claw for demolition hammer

Patent metadata

Field	Value
Publication number	US-RE49552-E
Application number	US-202117240385-A
Country	US
Kind code	E1
Filing date	Apr 26, 2021
Priority date	May 7, 2018
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

A rock claw for attaching to a corner of a demolition hammer, the rock claw including a first wall having a first inner side surface, a second wall having a second inner side surface joined to the first inner side surface along a first intersection, and a third wall having a third inner side surface. The third inner side surface is joined to the first inner side surface along a second intersection and the third inner side surface is joined to the second inner side surface along a third intersection.

First claim

What is claimed is:

1. A rock claw for attaching to a corner of a demolition hammer, the rock claw comprising:
a first wall having a first inner side surface;
a second wall having a second inner side surface joined to the first inner side surface along a first intersection; and
a third wall having a third inner side surface, the third inner side surface joined to the first inner side surface along a second intersection and the third inner side surface joined to the second inner side surface along a third intersection;
wherein the first wall has a height that is larger adjacent the first intersection than at a location that is more distal from the first intersection.

2. The rock claw of claim 1 , wherein the first intersection, the second intersection, and the third intersection meet at a point.

3. The rock claw of claim 1 , wherein the third inner side surface is perpendicular to at least one of the first inner side surface and the second inner side surface.

4. The rock claw of claim 1 , wherein each of the first inner side surface, the second inner side surface, and the third inner side surface is perpendicular to the other two inner side surfaces.

5. The rock claw of claim 1 , wherein the first wall has a first end portion adjacent both the first intersection and the second intersection, and a second end portion opposite the first end portion, wherein the first end portion has a first thickness and the second end portion has a second thickness that is less than the first thickness.

6. The rock claw of claim 5 , wherein a ratio of the first thickness to the second thickness is in the range of 2.5 to 4.5.

7. The rock claw of claim 1 , wherein the third inner side surface is triangular.

8. The rock claw of claim 1 , wherein the rock claw is symmetric along an axis defined by the first intersection.

9. The rock claw of claim 1 , wherein the third wall has a first thickness adjacent the first wall, a second thickness adjacent the second wall, and a third thickness intermediate the first wall and second wall, and wherein the third thickness is less than at least one of the first thickness and the second thickness.

10. The rock claw of claim 1 , wherein the first inner side surface includes a semicircular recess adjacent the third inner side surface.

11. A demolition hammer, comprising:
a housing having first side wall, a second side wall, and a bottom wall, wherein an intersection of the first side wall, the second side wall, and the bottom wall define a corner;
a power cell positioned within the housing;
a tool disposed in the power cell and projecting from the housing through an opening in the bottom wall; and
a rock claw attached to an external surface of the housing, the rock claw comprising:
a first wall;
a second wall joined to the first wall; and
a third wall joined to both the first wall and the second wall;,

wherein the first wall of the rock claw covers a portion of the first side wall of the housing, the second wall of the rock claw covers a portion of the second side wall of the housing, and the third wall cover of the rock claw covers a portion of the bottom wall of the housing, and
wherein the housing first side wall of the housing has a height and the first wall of the rock claw extends further along the height of the first side wall of the housing at a location adjacent the second side wall of the housing than at a location on the first side wall of the housing that is more distal from the second side wall of the housing.

12. The demolition hammer of claim 11 , wherein the first side wall has a width and the first wall of the rock claw extends along less than half of the width of the first side wall.

13. The demolition hammer of claim 11 , further comprising:
a third side wall, wherein an intersection of the second side wall, the third side wall, and the bottom wall define a second corner;
a second rock claw attached to an external surface of the housing, the second rock claw comprising:
a first wall
a second wall joined to the first wall;
a third wall joined to both the first wall and the second wall;

wherein the first wall of the second rock claw covers a portion of the second side wall, the second wall of the second rock claw covers a portion of the third side wall, and the third wall of the second rock claw cover a portion of the bottom wall.

14. The demolition hammer of claim 13 , wherein the second rock claw is interchangeable with the rock claw.

15. The demolition hammer of claim 13 , wherein the rock claw is spaced apart from the second rock claw.

16. The demolition hammer of claim 13 , further comprising
a fourth side wall, wherein an intersection of the third side wall, the fourth side wall, and the bottom wall define a third corner and an intersection of the fourth side wall, the first side wall, and the bottom wall define a fourth corner;
a third rock claw attached to an external surface of the housing, the third rock claw comprising:
a first wall
a second wall joined to the first wall;
a third wall joined to both the first wall and the second wall;

wherein the first wall of the third rock claw covers a portion of the third side wall, the second wall of the third rock claw covers a portion of the fourth side wall, and the third wall of the third rock claw cover a portion of the bottom wall; and
a fourth rock claw attached to an external surface of the housing, the fourth rock claw comprising:
a first wall
a second wall joined to the first wall;
a third wall joined to both the first wall and the second wall;

wherein the first wall of the fourth rock claw covers a portion of the fourth side wall, the second wall of the fourth rock claw covers a portion of the first side wall, and the third wall of the fourth rock claw cover a portion of the bottom wall.

17. The demolition hammer of claim 13 , wherein the first wall of the second rock claw has a first end portion adjacent the third wall and a second end portion opposite the first end portion, wherein the first end portion has a first thickness and the second end portion has a second thickness that is less than the first thickness.

18. A rock claw for attaching to a corner of a demolition hammer, the rock claw comprising:
a first wall having a first inner side surface;
a second wall having a second inner side surface joined to the first inner side surface along a first intersection; and
a third wall having a third inner side surface, the third inner side surface joined to the first inner side surface along a second intersection and the third inner side surface joined to the second inner side surface along a third intersection,
wherein the rock claw is symmetric along an axis defined by the first intersection.

19. The rock claw of claim 18 , wherein the third inner side surface is triangular.

20. The rock claw of claim 1,
wherein the first and second inner side surfaces have respective heights from and respective widths along the second intersection and the third intersection, wherein the height of each of the first and second inner side surfaces is maximum adjacent the first intersection and the width of each of the first and second inner side surfaces is maximum adjacent the third wall, and wherein the height of each of the first and second inner side surfaces decreases in a width direction of the first and second walls from the maximum height at the first intersection away from the first intersection.

21. The rock claw of claim 1, wherein for each of the first wall an

Assignees

• Caterpillar Inc

Inventors

• Walker Jason R
• Beckhusen Jordan R

Classifications

• B25D17/28

  Supports; Devices for holding power-driven percussive tools in working position {(connections of hammers to backhoes E02F3/966)} · CPC title

• E01C23/124

  moved rectilinearly, e.g. road-breaker apparatus with reciprocating tools, with drop-hammers · CPC title

• B25D17/02

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

• E02F9/2883

  Wear elements for buckets or implements in general · CPC title

• E02F5/30 Primary

  Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil · CPC title