EP 2076364 A1 20090708 - HYDRAULIC IMPACT MECHANISM
Title (en)
HYDRAULIC IMPACT MECHANISM
Title (de)
HYDRAULISCHE SCHLAGEINRICHTUNG
Title (fr)
MÉCANISME DE FRAPPE HYDRAULIQUE
Publication
Application
Priority
- SE 2007000932 W 20071024
- SE 0602237 A 20061025
Abstract (en)
[origin: WO2008051146A1] In a hydraulic impact device an impact piston (12) is reciprocated in a cylinder bore (10) and has a central drive portion (20) energised in an activation section (16) of the cylinder bore (10), and a forward end portion (23) and a rear end portion (25) of the impact piston (12) form clearance seals (24,26) visavi the cylinder bore (10), and at the ends of the cylinder bore (10) there are provided low pressure chambers (34,35) which together with a communication passage (36) form a low pressure circuit which is continuously connected to the tank (28). The low pressure chambers (34,35) at the ends of the cylinder bore (10) enables the impact piston (12) to be sealed off by clearance seals only, whereby piston leakage is prevented without the use of seal rings.
IPC 8 full level
B25D 9/04 (2006.01); B25D 9/14 (2006.01); B25D 9/18 (2006.01); B25D 17/11 (2006.01)
CPC (source: EP SE)
B25D 9/04 (2013.01 - EP SE); B25D 9/145 (2013.01 - EP); B25D 9/18 (2013.01 - EP); B25D 17/00 (2013.01 - SE); B25D 17/11 (2013.01 - EP SE); B25D 2217/0019 (2013.01 - EP); B25D 2250/365 (2013.01 - EP)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2008051146 A1 20080502; EP 2076364 A1 20090708; EP 2076364 A4 20121114; SE 0602237 L 20080426; SE 530617 C2 20080715
DOCDB simple family (application)
SE 2007000932 W 20071024; EP 07835133 A 20071024; SE 0602237 A 20061025