Hammer assembly

• US 10,363,651 B2
• Filed: 09/28/2015
• Issued: 07/30/2019
• Est. Priority Date: 09/28/2015
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Moore, Cody
• Primary Examiner(s): Long, Robert F
• Application Number:
  US14/867,130
• Publication Number:
  US 20170087703A1
• Time in Patent Office: 1,401 Days
• Field of Search: 173 47, 173184, 173200, 173218
• 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 hydraulic hammer comprising:

an elongated housing;

a removable head assembled on an end of the elongated housing and defining a chamber for holding a pressurized gas, the head including a wall extending transverse thereto and configured to abut the housing and defining a gas discharge passage extending between the chamber and the housing;

a fastener configured to removably attach the head to the housing;

a piston arranged for reciprocating movement within the head and the housing; and

an elastomeric plug positioned in the gas discharge passage and configured to move or deform under pressure of the pressurized gas in the chamber upon loosening of the fastener and removal or 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 fastener is at least one bolt.

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 hydraulic hammer, comprising:

a first member and a second member configured for attachment to each other and defining a chamber for holding a pressurized gas, the first member including a head and wall extending transverse thereto;

a fastener configured to removably attach the first member to the second member;

a piston arranged for reciprocating movement within the first member and the second member;

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

an elastomeric 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 upon loosening of the fastener and removal or separation of the first member from the second member without the use of a valve.

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 fastener is at least one bolt.

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.