EP 1261459 B1 20040929 - PNEUMATIC PISTON PERCUSSIVE MECHANISM WITH A HOLLOW PERCUSSION PISTON
Title (en)
PNEUMATIC PISTON PERCUSSIVE MECHANISM WITH A HOLLOW PERCUSSION PISTON
Title (de)
LUFTFEDERSCHLAGWERK MIT HOHLEM SCHLAGKOLBEN
Title (fr)
OUTIL DE PERCUSSION PNEUMATIQUE A PISTON FRAPPEUR CREUX
Publication
Application
Priority
- DE 19929183 A 19990625
- EP 0005752 W 20000621
Abstract (en)
[origin: DE19929183A1] The invention relates to a pneumatic piston percussive mechanism for a percussion drill and/or a drill hammer. The inventive mechanism comprises, housed in the housing (2) of the percussive mechanism, an axially reciprocating percussion piston (3). A drive piston (4) is axially reciprocated in a guide cylinder (8) of said percussion piston (3). Said guide cylinder (8) is provided on its inner face with one or more air compensation pockets (7). At least one idle opening (12) extends through the guide cylinder (8). In the percussive action, the idle opening (12) does not communicate with the ambience while in the idle mode the idle opening (12) can be displaced via an idle channel (13) that leads to the ambience and thus connects a cavity (6) that receives a pneumatic piston with the ambience by way of the idle opening (12). The air compensation pockets (7) and the idle openings (12) allow an optimization of the piston return behavior and of the idle operation of the percussive mechanism.
IPC 1-7
IPC 8 full level
B23B 45/16 (2006.01); B25D 1/00 (2006.01); B25D 9/04 (2006.01); B25D 11/04 (2006.01); B25D 17/06 (2006.01); B25D 17/10 (2006.01)
CPC (source: EP US)
B25D 11/04 (2013.01 - EP US); B25D 17/06 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE ES LI SE
DOCDB simple family (publication)
DE 19929183 A1 20010104; DE 19929183 B4 20040729; DE 50008035 D1 20041104; EP 1261459 A2 20021204; EP 1261459 B1 20040929; ES 2225169 T3 20050316; JP 2003514675 A 20030422; US 6568484 B1 20030527; WO 0100368 A2 20010104; WO 0100368 A3 20020926
DOCDB simple family (application)
DE 19929183 A 19990625; DE 50008035 T 20000621; EP 0005752 W 20000621; EP 00942113 A 20000621; ES 00942113 T 20000621; JP 2001506063 A 20000621; US 1859001 A 20011212