HAMMER ASSEMBLY

• US 20170087703A1
• Filed: 09/28/2015
• Published: 03/30/2017
• Est. Priority Date: 09/28/2015
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Moore, Cody
• Granted Patent: US 10,363,651 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B25D 17/00 Details of, or accessories for, portable power-driven percussive tools details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00
• CPC Class Codes: B25D 2250/121 Housing details
• CPC Class Codes: B25D 2250/365 Use of seals
• CPC Class Codes: B25D 9/04 of the hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member
• CPC Class Codes: B25D 9/145 for hydraulically actuated hammers having an accumulator
• CPC Class Codes: E02F 3/966 of hammer-type tools arrangements for breaking-up hard ground E02F5/305; percussion -type rippers E02F5/323
• CPC Class Codes: E02F 9/22 Hydraulic or pneumatic drives for dipper or bucket arm position control E02F3/43, for blade position control for graders E02F3/844; for turntables E02F9/121; for fork-lift trucks B66F9/22

Abstract

A hammer including a housing and a piston arranged for reciprocating movement within the housing is disclosed. The hammer further includes a head assembled on the housing and defining a chamber for holding a pressurized gas and a wall configured to abut the housing and defining a gas discharge passage extending between the chamber and the housing. A plug is positioned in the gas discharge passage and configured to move or deform under pressure of the pressurized gas in the chamber.

Claims

1. A hammer comprising:

a housing;

a piston arranged for reciprocating movement within the housing;

a head assembled on the housing and defining a chamber for holding a pressurized gas;

the head comprising a wall configured to abut the housing and defining a gas discharge passage extending between the chamber and the housing; and

a plug positioned in the gas discharge passage and configured to move or deform under pressure of the pressurized gas in the chamber on separation of the head from the housing.

2. The hammer of claim 1, wherein the plug abuts the housing.

3. The hammer of claim 1, wherein the plug defines a clearance with the gas discharge passage.

4. The hammer of claim 3, wherein the plug comprises of a seal configured to engage the gas discharge passage.

5. The hammer of claim 1, wherein the head is assembled on the housing by bolts.

6. The hammer of claim 1, wherein the pressurized gas is nitrogen.

7. The hammer of claim 1, wherein the gas discharge passage has a first end exposed to the chamber and a second end having a receptacle configured to receive the plug.

8. A hammer comprising:

a first member and a second member configured for attachment to each other and defining a chamber for holding a pressurized gas;

a gas discharge passage defined in the first member and extending between the chamber and an outside surface of the first member;

a plug inserted in the gas discharge passage, the plug retained in the gas discharge passage against the pressure of the gas in the chamber by the second member such that the plug permits escape of the gas through the gas discharge passage on separation of the first member from the second member.

9. The hammer of claim 8, wherein the plug abuts the second member.

10. The hammer of claim 8, wherein the plug defines a clearance with the gas discharge passage.

11. The hammer of claim 8, wherein the plug comprises of a deformable seal.

12. The hammer of claim 8, wherein the first member is attached to the second member by bolts.

13. The hammer of claim 8, wherein the pressurized gas is nitrogen.

14. The hammer of claim 8, further comprising a sound indication device placed in the passage.

15. A method of assembling a hammer, the hammer comprising a housing for holding a piston and a head for mounting on the housing, the head defining a chamber for holding a pressurized gas;

the head comprising a wall configured to abut the housing and defining a gas discharge passage extending between the chamber and the housing;

the method comprising;

placing a plug in the gas discharge passage, the plug configured to be moved or deformed under pressure of the gas in the chamber on separation of the head from the housing;

mounting the head on the housing to seal the gas discharge passage; and

pressurizing the chamber with a gas.

16. The method of claim 15 comprising placing the plug abutting the housing in the gas discharge passage.

17. The method of claim 15, further comprising placing the plug with a deformable seal in the gas discharge passage.

18. The method of claim 15, wherein the gas is nitrogen.

19. The method of claim 15, further comprising placing a sound indication device in the gas discharge passage.

20. The method of claim 15, wherein the head is mounted on the housing with bolts.