Pile-driving hammer

• US 4,067,401 A
• Filed: 04/19/1976
• Issued: 01/10/1978
• Est. Priority Date: 04/11/1975
• Status: Expired due to Term

• Current Assignee: Van Kooten BV
• Original Assignee: Van Kooten BV
• Inventors: Schnell, Hans Gunther
• Primary Examiner(s): Hafer, Robert A.
• Application Number:
  US05/677,925
• Time in Patent Office: 631 Days
• Field of Search: 173/135, 92/153, 92/155, 92/159, 92/160, 184/6.8, 184/6.7, 184/6.14
• US Class Current: 173/135
• CPC Class Codes: E02D 7/06 Power-driven drivers tampers E02D3/061
• CPC Class Codes: F16C 17/18 with floating brasses or brushing, rotatable at a reduced speed F16C17/03, F16C17/06 take precedence
• CPC Class Codes: F16C 33/1075 Wedges, e.g. ramps or lobes, for generating pressure

Abstract

A pile-driving hammer comprises a hammer cylinder, a piston accomodated in said hammer cylinder in sealing relationship with a sliding face of the hammer cylinder and means for supplying lubricant to said sliding face which consists of a lining of wear-resistant material.

The pile driving hammer has a long lifetime, since cavities are provided in the lining distributed along the surface of the sliding face. In this hammer the lubricant is retained in the cavities.

Claims

1. A pile-driving hammer comprising a hammer cylinder having an inner sliding face, a piston received within said hammer cylinder in sealing relationship with said sliding face of the hammer cylinder and means for supplying a lubricant to said sliding face comprising a lining formed of wear-resistant material on said sliding face of the hammer cylinder having a plurality of recessed cavities formed therein distributed along the surface of said sliding face.

2. A pile-driving hammer as claimed in claim 1 wherein said cavities have the shape of elongated slots.

3. A pile-driving hammer as claimed in claim 1 wherein said cavities have the shape of elongated slots oriented at an angle of inclination to the axial direction of the hammer cylinder.

4. A pile driving hammer as claimed in claim 1 including a guide frame for guiding the hammer and means for suspending said guide frame at an angle of inclination to a vertical plane.

5. A pile driving hammer as claimed in claim 1 wherein said cylinder is a steel body and sliding face of the hammer cylinder comprises a surface lining galvanically applied to said steel body.

6. A pile driving hammer as claimed in claim 5 wherein said lining is formed of chromium.

7. A pile driving hammer as claimed in claim 5 wherein said lining is formed of cadmium.

8. A pile driving hammer as claimed in claim 1 wherein said hammer is of the diesel type;

said hammer cylinder has an open top end; and

said piston includes an oil reservoir at its top end;

said oil reservoir communicating through at least one channel with said sliding face of said hammer cylinder.

9. The method of treating the sliding face of a hammer cylinder in a pile driving hammer which comprises the steps of placing a lining on said hammer cylinder;

galvanically removing lining material from the lining of said cylinder to form cavities therein, and covering said lining with a cover layer having apertures therein located in alignment with the cavities in the lining whereby said cavities and holes will distribute lubricating fluid along said cylinder and a piston received therein.