EP 0658681 B1 20000322 - Drill hammer
Title (en)
Drill hammer
Title (de)
Bohrhammer
Title (fr)
Marteau à forage
Publication
Application
Priority
DE 9319223 U 19931215
Abstract (en)
[origin: US5564510A] According to the invention, a drill hammer (10) generally comprises an outer tube (55), a control casing jacket (60) inclusive of check valve (59) and a central tube (80) having radial passages (81, 83). A ram (75) is guided on central tube (80), onto the lower and preferably recessed end (84) of which the head of a drill steel (90) may slide. A cylinder liner (70) that may be provided with outer ribs (101) also guides ram (75) and is peripherally welded to outer tube (55) along a welding zone S of axial length l. Above control casing jacket (60), there is an adapter (40) comprising downstream channels (43) and carrying a blowing collar (50) provided with upwardly directed nozzles (53). A drive-transmitting sleeve (15) below a screw head (11) is joined to the adapter (40) either directly or via a shift unit (30) that guides a shaft (20) whose lower end (23) may form a slide valve relative to an upper adapter portion (41). From there, passages (42, 47) lead to a control casing jacket (62) having channels (63). Below a tubular body (61), there is between outer tube (55) and cylinder liner (70) a jacket chamber (68) of a free cross section at least as large as that of the narrowest among central passages (12, 22, 32, 42/47, 62, 82, 92) in the main components of the hammer, including the screw head (11), a shaft (20), a shift unit (30), an adapter (40), a tubular body (61), the central tube (80), and a shaft and the drill steel (87/90) of the drill hammer (10). Grooves, channels and bores (71, 72; 81, 83) in cylinder liner (70) and central tube (80) serve, together with recesses (76, 76') and bores (78, 78'), for controlling the movement of the ram (75).
IPC 1-7
IPC 8 full level
CPC (source: EP US)
E21B 4/14 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IE IT LI SE
DOCDB simple family (publication)
US 5564510 A 19961015; AT E191055 T1 20000415; AU 677874 B2 19970508; AU 8046794 A 19950622; CA 2138086 A1 19950616; CZ 285685 B6 19991013; CZ 316194 A3 19950712; DE 59409229 D1 20000427; DE 9319223 U1 19940224; EP 0658681 A2 19950621; EP 0658681 A3 19970102; EP 0658681 B1 20000322; ES 2147212 T3 20000901; ZA 949802 B 19951002
DOCDB simple family (application)
US 35600394 A 19941214; AT 94119216 T 19941206; AU 8046794 A 19941214; CA 2138086 A 19941214; CZ 316194 A 19941214; DE 59409229 T 19941206; DE 9319223 U 19931215; EP 94119216 A 19941206; ES 94119216 T 19941206; ZA 949802 A 19941208