Greaseless hydraulic hammer
US12325116B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2024 |
| Grant date | Jun 10, 2025 |
| Priority date | — |
| Expiry date | May 8, 2044 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/966
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A hydraulic hammer includes a housing and a plurality of splines. The housing defines a chamber extending along a longitudinal axis configured to receive a tool. The splines are disposed on an inner surface of the chamber and extend parallel to the longitudinal axis. Each of the splines has a contact surface configured to slidably guide the tool when disposed within the chamber. A treated layer is applied to the contact surface of each spline, the treated layer configured to withstand approximately between 100 MPa to 320 MPa of pressure applied during an operation of the hydraulic hammer without galling. An interface is defined between the contact surface of the splines and a surface of the tool and is configured to facilitate sliding engagement between the treated layer of the contact surface of the splines and the surface of the tool without lubricant during the operation of the hydraulic hammer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.