EP0978625A3 - Percussive drill - Google Patents

Percussive drill Download PDF

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Publication number
EP0978625A3
EP0978625A3 EP99115321A EP99115321A EP0978625A3 EP 0978625 A3 EP0978625 A3 EP 0978625A3 EP 99115321 A EP99115321 A EP 99115321A EP 99115321 A EP99115321 A EP 99115321A EP 0978625 A3 EP0978625 A3 EP 0978625A3
Authority
EP
European Patent Office
Prior art keywords
percussion piston
slides
central bore
outer tube
control pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP99115321A
Other languages
German (de)
French (fr)
Other versions
EP0978625A2 (en
Inventor
Hans-Philipp Walter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0978625A2 publication Critical patent/EP0978625A2/en
Publication of EP0978625A3 publication Critical patent/EP0978625A3/en
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/06—Means for driving the impulse member
    • B25D9/08—Means for driving the impulse member comprising a built-in air compressor, i.e. the tool being driven by air pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/16—Valve arrangements therefor
    • B25D9/20—Valve arrangements therefor involving a tubular-type slide valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D2209/005—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously having a tubular-slide valve, which is coaxial with the piston

Abstract

Ein pneumatisch angetriebener Bohrhammer (10) hat eine Anschlußkappe (11) für eine Druckluftquelle und ein Außenrohr (15), das mit einer Gewindebüchse (50) fest verbunden ist. Gestützt mit einer Zwischenhülse (51) sitzt auf einem Büchsenaufsatz-Oberteil (55), ein Steuerzapfen (40), der unten ein verjüngtes Endstück hat und berührungslos in eine Zentralbohrung (82) eines Schlagkolbens (75) ragt. Dieser hat zwei außen offene Ringnuten (76, 76'), die mittels nach oben und unten verlaufender Axialbohrungen (78, 78') mit einem Kompressionsvolumen (82) bzw. einem den Bohrkronenkopf (91) umgebenden Ringraum (94) strömungsverbunden sind. Der Schlagkolben (75) gleitet in einer Zylinderbüchse (70), die mit dem ebenfalls außengerippten Büchsenaufsatz-Oberteil (55) und dem Außenrohr (15) zumindest teilweise formschlüssig zu einer Einheit fest verbunden, z.B. aufgeschrumpft ist. Der Schlagkolben (75) hat eine Zentralbohrung (82), die unten mit einer Ventilfläche (79) auf ein Fußventil (97) und oben mit einer weiteren Ventilfläche (110) auf einen Schaft (44) des Steuerzapfens (40) aufgleitet. Dieser ist hierzu mit einer Durchmesserstufe (46) versehen, die gerundete Übergänge aufweisen kann.

Figure 00000001
A pneumatically driven hammer drill (10) has a connection cap (11) for a compressed air source and an outer tube (15) which is firmly connected to a threaded bush (50). Supported with an intermediate sleeve (51), a control pin (40) sits on an upper bush part (55), which has a tapered end piece at the bottom and projects into a central bore (82) of a percussion piston (75) without contact. This has two externally open annular grooves (76, 76 '), which are flow-connected by means of upward and downward axial bores (78, 78') with a compression volume (82) or an annular space (94) surrounding the drill bit head (91). The percussion piston (75) slides in a cylinder liner (70), which is at least partially positively connected, for example shrink-fit, to the unit with the outer cap (55) and the outer tube (15), which is also ribbed. The percussion piston (75) has a central bore (82) which slides on the bottom with a valve surface (79) on a foot valve (97) and on the top with a further valve surface (110) on a stem (44) of the control pin (40). For this purpose, this is provided with a diameter step (46) which can have rounded transitions.
Figure 00000001
EP99115321A 1998-08-03 1999-08-03 Percussive drill Ceased EP0978625A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29813825U 1998-08-03
DE29813825U DE29813825U1 (en) 1998-08-03 1998-08-03 Hammer drill

Publications (2)

Publication Number Publication Date
EP0978625A2 EP0978625A2 (en) 2000-02-09
EP0978625A3 true EP0978625A3 (en) 2001-06-06

Family

ID=8060759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99115321A Ceased EP0978625A3 (en) 1998-08-03 1999-08-03 Percussive drill

Country Status (2)

Country Link
EP (1) EP0978625A3 (en)
DE (1) DE29813825U1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003031761A1 (en) * 2001-10-10 2003-04-17 Reginald Frederick Taylor Down-the-hole drill hammer
DE10352747A1 (en) * 2003-11-12 2005-06-16 Rolf Bartholet Percussion drill for drilling deep bore has cylinder with two sets of control apertures inside outer casing and has pressure air reservoir and striker piston with valve system
DE102005015886B4 (en) * 2005-04-06 2008-06-19 Hans-Philipp Walter Rotary Hammer
NO335354B1 (en) * 2013-02-18 2014-12-01 Pav Holding As High frequency liquid driven drill hammer for percussion drilling in hard formations
CN105804657A (en) * 2016-05-16 2016-07-27 山东天瑞重工有限公司 High-air-pressure down-the-hole drill bit with sealing structure
CN115977525B (en) * 2023-02-02 2024-04-05 重庆大学 Positive circulation pneumatic down-the-hole hammer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2705191A1 (en) * 1976-02-09 1977-08-11 Reed Tool Co IMPACT DRILLING TOOL
EP0837214A2 (en) * 1996-10-18 1998-04-22 Hans-Philipp Walter Percussive drill

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2705191A1 (en) * 1976-02-09 1977-08-11 Reed Tool Co IMPACT DRILLING TOOL
EP0837214A2 (en) * 1996-10-18 1998-04-22 Hans-Philipp Walter Percussive drill

Also Published As

Publication number Publication date
EP0978625A2 (en) 2000-02-09
DE29813825U1 (en) 1998-10-22

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