EP1519811A1 - Portable tool - Google Patents
Portable toolInfo
- Publication number
- EP1519811A1 EP1519811A1 EP02754825A EP02754825A EP1519811A1 EP 1519811 A1 EP1519811 A1 EP 1519811A1 EP 02754825 A EP02754825 A EP 02754825A EP 02754825 A EP02754825 A EP 02754825A EP 1519811 A1 EP1519811 A1 EP 1519811A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- portable
- percussion
- impact body
- tool
- striking
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/21—Metals
- B25D2222/36—Lead
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/21—Metals
- B25D2222/51—Hard metals, e.g. tungsten carbide
Definitions
- the invention relates to a portable implement, in particular chisel hammer or hammer drill, of the type specified in the preamble of claim 1.
- the invention has for its object to develop a portable implement of the generic type such that a high hammering or drilling performance is achieved.
- the increased mass of the striking body leads to an increase in the impact energy and thus to an increase in the hammering performance or, with a simultaneous rotating and striking drive, to an increase in the drilling performance. It has surprisingly been found that the output increases disproportionately compared to the engine output. Tests with an approximately 90% increase in the weight of the impact body resulted in an increase in the drilling performance by 30% and an increase in the engine output by only 10%. With the same size of an implement, in particular a rotary hammer, an increase in performance can thus be achieved. The weight gain is based on the total weight of the Hammer drill comparatively low. The disproportionate increase in impact energy leads to a better efficiency of the overall system.
- the mass of the impact body is advantageously at least 140%, in particular more than 160%, of an impact body of the same construction volume made of steel.
- the impact body made of hard metal is advantageous, the impact body having a density of 12.0 kg / dm 3 to 13.0 kg / dm 3 , in particular of approximately 12.85 kg / dm 3 .
- the percussion body is advantageously a percussion piston which is axially movable in a percussion cylinder and which is moved hydraulically in particular in the percussion cylinder.
- the impact power could be doubled compared to a steel impact piston.
- the pressure area of the percussion piston for the movement in the direction of the tool insert is larger than the pressure area for the movement in the opposite direction, in particular a multiple.
- 1 is a partial sectional side view of a portable hammer drill
- 2 shows a striking system consisting of striking cylinder and striking piston in partial section
- FIG. 3 is a perspective view of the impact system of FIG. 2,
- FIG. 5 shows a side view of the percussion piston from FIG. 5,
- FIG. 6 shows a perspective view of the percussion piston from FIG. 5.
- the portable hammer drill shown in FIG. 1 has a tool insert 6 which is driven to rotate about its longitudinal axis 5 and is moved back and forth in an oscillating manner in the direction of the longitudinal axis 5 during operation.
- the hammer drill 1 has a handle 2 and an operating lever 3 arranged on the handle 2.
- the operating mode that is to say rotating or striking machining, or the combination of rotating and striking machining in the position of the selector lever 4 shown in FIG. 1 can be set on the selector lever 4.
- the tool insert 6 is fixed in a chuck 13.
- a percussion piston 8 is provided as the striking element and is displaceably arranged in a striking cylinder 9 in the direction of the longitudinal axis 5. With the striking surface 24, the striking piston 8 strikes the die 7, which in turn strikes the tool insert 6.
- the impact piston 8 which represents the impact body, is made of hard metal with a density of approximately 12.85 kg / dm 3 .
- the mass of the percussion piston is expediently increased by at least 40%, in particular by more than 60%, compared to a steel percussion piston.
- FIG. 2 shows a variant of an impact system 14 which comprises an impact cylinder 9 and an impact piston 8.
- the percussion piston 8 is guided in the percussion cylinder 9 so as to be longitudinally displaceable along the axis 27 of the percussion system 14.
- the axis 27 of the percussion system 14 runs with the percussion system 14 arranged in a rotary hammer 1 along the longitudinal axis 5 of a tool insert 6 arranged in the rotary hammer 1.
- the percussion cylinder 9 has screws 22 for fixing the percussion cylinder 9 in a housing 28 of the rotary hammer 1 shown in FIG. 1 on.
- the percussion cylinder may also be expedient for the percussion cylinder to be fixed by means of an adapter sleeve and for securing against rotation on the percussion cylinder 9, a hexagon 29 is formed at the end facing a striker. Another flange connection can also be provided.
- the oil inlet 15 and the oil outlet 17 shown in perspective in FIG. 3 are provided.
- At least one control bore 16 is arranged in the axial direction between the oil inlet 15 and the oil outlet 17.
- Pressurized oil which flows through the oil inlet 15 into the annular gap 30 formed between the percussion piston 8 and the percussion cylinder 9, acts on the pressure surface 11 on the percussion piston 8 and thus causes a movement of the percussion piston in the direction of movement 32, which is opposite to the direction of movement 31 in the direction a tool insert 6 runs.
- the oil inlet 15 must not be completely closed towards the annular gap 30.
- the control bore 16 is opened or closed by the control surface 23 on the percussion piston 8 depending on the position of the percussion piston 8.
- the pressure surface 10 is pressurized.
- the pressure surface 10 is a multiple of the pressure surface 11 and extends in particular over the entire cross section of the percussion piston 8.
- a seal receptacle 18 is arranged on the percussion cylinder 9, in which a seal 19 is arranged.
- the seal 19 suitably consists of several sealing elements. The seal 19 rests on a spacer 20.
- the percussion piston 8 is shown separately in FIGS. 4 to 6.
- the percussion piston 8 is on the front guide surface. before 25, the control surface 23 and the rear guide surface 26 in the impact cylinder 9.
- the percussion piston 8 In the area of the rear guide surface 26 and the control surface 23, the percussion piston 8 each has a diameter d of approximately 39 mm.
- the length 1 of the percussion piston 8, ie the extent of the percussion piston 8 in the direction of the axis 27, is approximately 235 mm.
- a chamfer can be formed on the front guide surface 25, which merges into the striking surface 24.
- the striking surface 24 is spherical or rounded.
- the percussion piston 8 has an increased mass compared to a steel percussion piston of the same volume.
- the mass of the impact piston 8, which here represents the impact body, is 140%, in particular more than 160%, of the mass of a steel impact body with the same overall volume.
- the impact body made of hard metal is advantageous, in particular with a density of approximately 12.85 kg / dm 3 .
- densities from 12.0 kg / dm 3 to about 13.0 kg / dm 3 can be advantageous.
- the casing of the impact body is advantageously made of steel.
- the impact body can be used in mechanical as well as in pneumatic and hydraulic impact mechanisms.
- the impact body is expediently used in chisel hammers or rotary hammers. Chisel hammers are used in particular to refer to tools that do not have a rotating drive for a tool insert.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2002/007396 WO2004014616A1 (en) | 2002-07-04 | 2002-07-04 | Portable tool |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1519811A1 true EP1519811A1 (en) | 2005-04-06 |
Family
ID=31502664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02754825A Withdrawn EP1519811A1 (en) | 2002-07-04 | 2002-07-04 | Portable tool |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1519811A1 (en) |
WO (1) | WO2004014616A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2726214A1 (en) * | 1977-06-10 | 1978-12-21 | Hilti Ag | Rotary and impact drill with pneumatic piston - has buffer and seal with braking action, between piston and impact member |
SE7902872L (en) * | 1979-03-30 | 1980-10-01 | Atlas Copco Ab | PNEUMATIC BATTERY MECHANISM |
JPH06108770A (en) * | 1992-08-31 | 1994-04-19 | Sig (Schweiz Ind Ges) | Drill device for rock drill |
DE19508542A1 (en) * | 1995-03-10 | 1996-09-12 | Tracto Technik | Impact device |
-
2002
- 2002-07-04 WO PCT/EP2002/007396 patent/WO2004014616A1/en not_active Application Discontinuation
- 2002-07-04 EP EP02754825A patent/EP1519811A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2004014616A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2004014616A1 (en) | 2004-02-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20041125 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: A & M ELECTRIC TOOLS GMBH |
|
DAX | Request for extension of the european patent (deleted) | ||
RBV | Designated contracting states (corrected) |
Designated state(s): DE FR IT |
|
17Q | First examination report despatched |
Effective date: 20061115 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20070327 |