Title:
DAMPER UNIT AND DRILL STRING SYSTEM COMPRISING SUCH A DAMPER UNIT
Document Type and Number:
WIPO Patent Application WO/2013/050231
Kind Code:
A3
Abstract:
A damper unit (1) and a drill string system comprising a DTH hammer and a damper unit. The damper unit comprises at least one first damping element (81, 82) for damping of tensional forces along an axial direction of the damper unit and at least one second damping element (11) for damping of compressive forces along the axial direction, wherein the first damping element is separate from the second damping element and at least one of the first and second damping elements (81, 82, 11) is axially divided. The stress level exerted on an individual damping element is low, the durability of the damping element is improved and mounting of a damper is facilitated.
Inventors:
RANTALA ESA (FI)
PARKKINEN TAPIO (FI)
KESKILAMMI JUHA (CH)
MAEKI JORMA (FI)
PARKKINEN TAPIO (FI)
KESKILAMMI JUHA (CH)
MAEKI JORMA (FI)
Application Number:
PCT/EP2012/068181
Publication Date:
October 17, 2013
Filing Date:
September 17, 2012
Export Citation:
Assignee:
SANDVIK INTELLECTUAL PROPERTY (SE)
RANTALA ESA (FI)
PARKKINEN TAPIO (FI)
KESKILAMMI JUHA (CH)
MAEKI JORMA (FI)
RANTALA ESA (FI)
PARKKINEN TAPIO (FI)
KESKILAMMI JUHA (CH)
MAEKI JORMA (FI)
International Classes:
E21B17/07
Foreign References:
| US5372548A | 1994-12-13 | |||
| US4192155A | 1980-03-11 | |||
| GB2025490A | 1980-01-23 | |||
| GB1339051A | 1973-11-28 | |||
| US2973996A | 1961-03-07 |
Attorney, Agent or Firm:
FRÖDERBERG, Oskar (Sandviken, SE)
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