EP2564985A1 - Sonnerie à coussin d'air pour marteau perforateur ou burineur motorisé - Google Patents
Sonnerie à coussin d'air pour marteau perforateur ou burineur motorisé Download PDFInfo
- Publication number
- EP2564985A1 EP2564985A1 EP12181795A EP12181795A EP2564985A1 EP 2564985 A1 EP2564985 A1 EP 2564985A1 EP 12181795 A EP12181795 A EP 12181795A EP 12181795 A EP12181795 A EP 12181795A EP 2564985 A1 EP2564985 A1 EP 2564985A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air cushion
- impact
- housing
- drive piston
- housing sleeve
- 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.)
- Granted
Links
- 238000005553 drilling Methods 0.000 claims abstract description 9
- 238000009527 percussion Methods 0.000 claims description 41
- 238000010304 firing Methods 0.000 claims description 22
- 230000033001 locomotion Effects 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 13
- 238000013016 damping Methods 0.000 claims description 9
- 238000013022 venting Methods 0.000 claims description 8
- 230000035939 shock Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 description 6
- 230000002028 premature Effects 0.000 description 4
- 238000010009 beating Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0011—Details of anvils, guide-sleeves or pistons
- B25D2217/0019—Guide-sleeves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/231—Sleeve details
- B25D2250/235—Sleeve couplings
Definitions
- the present invention relates to an air cushion percussion for a motor-driven drill or percussion hammer and a motor-driven drill or percussion hammer with an air cushion impact mechanism.
- an air impact impact mechanism essentially comprises a cylindrical tube, a drive piston which is axially movable in the tube, and a percussion body ("racket") which is also axially movable in the tube, an air cushion being enclosed in the tube between the drive piston and the impactor transfers the impact energy from the drive piston to the impactor and mechanically decouples the impactor from the drive piston.
- the drive piston is in this case driven via a connecting rod by a crankshaft, which is rotated by an electric motor, so that the drive piston in the tube performs an axially oscillating movement.
- the tool is received in a tool holder and can be driven directly by the impactor or indirectly via, for example, a striker ("striker"), which in turn is driven by the striker.
- a striker which in turn is driven by the striker.
- the moving impact mass of the impactor transmits on impact on the firing pin a pulse, which this in turn transmits to the tool.
- the firing pin also has the task to move the percussion and in particular the impactor when pressing the tool from an idle position to a working position.
- the sealing of the air cushion between the impactor and the drive piston is not absolutely leakage-free possible, so that to compensate for the leakage losses and to maintain the percussion function a ventilation of the air cushion is required.
- compensation holes are usually arranged in the wall of the tube in the region of the air cushion, which are released or closed in dependence on the axial position of the impactor and the drive piston and thereby allow ventilation of the air cushion.
- the ventilation of the air cushion is thus controlled by the impactor and possibly also by the drive piston.
- the disclosure DE 198 10 088 C1 a drill and / or percussion hammer, the housed in his housing air cushion impact comprising a reciprocating piston in a guide tube and a racket, between which an air cushion space is formed in the guide tube, which is vented in an idle position of the impact mechanism via at least one control port.
- the control opening can be closed by a control part located outside the guide tube in an impact position of the percussion mechanism in order to build up an air cushion in the air cushion space.
- the control part is formed as an annular member which is fixed to the housing and the guide tube receives axially displaceable in it.
- the guide tube is acted upon axially with the force of a return spring, which is supported on the one hand on the control part and on the other hand on a projecting on the jacket of the guide tube outwardly circumferential collar.
- the return spring tries to hold the guide tube in a front starting position, in which the control part covers the control opening.
- at least one additional opening is provided which is arranged on the tool side in front of the control openings and which is covered by the racket in impact mode. The prerequisite for the formation of an air cushion is that both the control openings and the additional openings are closed.
- the guide tube When idling, the guide tube is moved forward by a spring, so that the control port is free.
- An additional rotary drive for the tool holder via longitudinal teeth on the guide tube and a toothing between the guide tube and tool holder is a transmission of the rotational movement.
- the beater drive piston
- the seals overruns the breather bores in impact mode, which places a heavy load on the respective seal and therefore rapidly degrades the seal and decreases impact due to increased leakage leads.
- the German Utility Model DE 19 69 990 U is also a device for switching from impact drills on rotary drills and vice versa known for electro-pneumatic rotary hammers.
- the device comprises a guide sleeve with axially spaced apart ventilation holes, within which a percussion piston is received axially displaceable. This transmits its impact energy in beating operation immediately on a projecting into the cylinder space of the guide sleeve tool holder.
- the percussion piston is arranged in beating operation together with the tool holder in the cylinder chamber such that its sealing portion is located axially behind the vent holes, so that in a stroke forward towards the tool no damping this intercepting air cushion can arise while in the rear of the cylinder chamber a completed air cushion space is maintained to transmit the impact motion.
- the tool holder When idling, the tool holder is moved so far forward together with the percussion piston in the direction of the tool that the sealing portion of the percussion piston is located between the axially spaced vent holes.
- the rear vent holes serve to vent the driving air cushion space and prevent the required to drive the percussion piston pressure or negative pressure can build up. Recovery may in turn be accomplished by displacing the tool holder and percussion piston relative to the cylinder space, i. when pressing the tool, done.
- an object of the present invention to provide an air impact impactor for a power driven drill or percussion hammer, which at least reduces the known prior art disadvantages of the prior art and provides a simple and stable air cushion impact mechanism becomes.
- an air cushion impact mechanism for a motor driven drilling or percussion hammer, which comprises a two-part housing sleeve, in which at least one drive piston for the conversion of a drive energy into impact energy and at least one impactor and a firing pin for delivering the impact energy to a tool of the hammer or percussion hammer along a longitudinal axis of the housing sleeve are movably received.
- a switching device allows switching of the impact mechanism between an idling operation and a percussion operation, wherein in the impact mode between the drive piston and the impactor a first air cushion for transmitting the impact energy from the drive piston can be formed on the impactor and in idle operation, a second air cushion for impact damping between the Impact body and the firing pin can be formed, and wherein the housing sleeve has at least one first vent for venting the first air cushion and at least one second vent for venting the second air cushion.
- both parts of the housing sleeve according to the invention along its longitudinal axis are displaceable relative to each other, both parts of the housing sleeve having at least one vent hole, which are at least partially aligned with each other in a first position of the housing parts to each other to jointly form the second vent and a vent of the second Allow air cushion, and are closed in a second position respectively by the other part of the housing sleeve to allow a shock absorption.
- the housing sleeve is formed in two parts, wherein the second vent opening is formed only by the fact that the two housing parts occupy a particular position relative to each other, in which the respectively formed on the housing parts vent holes are aligned and thus form the second vent opening.
- the second air cushion is not for the transmission of impact energy, but for damping a shock from the racket on the Firing pin provided. This is particularly desirable when idling the racket or the drive piston trailing.
- blows of the impact mechanism to reduce the resulting significant burden of percussion components and avoid premature failure of the air cushion impact mechanism.
- the two housing parts are shifted from each other so that their respective vent holes offset from each other and so no air can escape from the space between the racket and the firing pin.
- the drive piston can therefore reach no compression of the air, which further shocks (blanking) can be avoided.
- the two housing parts When switching with the aid of the switching device from the idle mode to the impact mode, the two housing parts are shifted from each other so that the vent holes of the two housing parts are at least partially aligned with each other and together form the second vent for venting the second air cushion.
- the air cushion formed for shock absorption can be vented and beat the bat on the firing pin to transfer the impact energy from the drive piston to the tool.
- the drive piston and the impactor body may each have a sealing portion, which in sealing contact with the inner circumference of the housing sleeve is to limit between them the air cushion within the housing sleeve.
- the two-part housing sleeve may have a guide which allows an axial movement of the two housing parts relative to each other and blocks a radial movement of the two housing parts relative to each other.
- This is particularly desirable when the air cushion impact mechanism is used in a hammer drill, which is not only a beating movement (chisel operation), but also a rotary motion (drilling operation) to transfer to the tool.
- a toothing in which engages a drive wheel of the hammer drill.
- the rotational movement can be transmitted from the housing sleeve to the tool via a toothing.
- the guide is provided which allows transmission of the rotational movement of the drive-facing part of the housing sleeve on the tool-facing part of the housing sleeve.
- the guide may comprise according to an embodiment of the invention at least one guide pin on one of the housing parts, which is guided in a guide groove on the other of the housing parts.
- the guide groove may be formed in particular as a slot in the wall of one of the housing parts, in which the guide pin is guided.
- an elastic return element can be provided which is suitable for holding the two housing parts in one of the two positions or returning them to one of the two positions.
- the elastic return element may comprise a spring which biases the two housing parts in one of the two positions against each other.
- an air cushion impact mechanism which comprises a housing sleeve in which at least one drive piston for converting a drive energy into impact energy and at least one impact body for delivering the impact energy to a tool of the hammer or percussion hammer with a between the air piston located to the drive piston and the impactor for the transmission of the impact energy of the drive piston on the striker along a longitudinal axis of the housing sleeve are movably received.
- the air cushion percussion mechanism further comprises a switching device, which allows switching of the percussion mechanism between an idling operation and a striking operation, wherein the housing sleeve has at least one vent opening for venting the air cushion.
- the at least one vent opening according to the invention in the impact mode of drilling or percussion hammer along the longitudinal axis of the housing sleeve is arranged offset to the air cushion, so that the air cushion between the drive piston and the impactor is maintained, and the switching device is capable of switching to idle operation the impactor and / or axially displace the drive piston relative to the vent opening so that the air cushion can be vented through the vent opening during idling operation of the impact mechanism.
- the switching device may also include a striker (striker), which is driven in impact mode by the striker (racket) and emits the impact energy to the tool. If the tool is pressed against a resistance, firing pin and racket from the idle position of the air cushion impact mechanism to the rear, d. H. towards the drive piston within the housing sleeve, moved. As a result, the drive piston can be brought into a position in which the air cushion between the drive piston and the racket can be vented via the at least one vent opening.
- striker shtriker
- the invention further relates to a motor-driven drilling or percussion hammer with an air cushion impact mechanism with the above features.
- FIG. 1 a side view of the air cushion impact mechanism according to the invention, wherein the air cushion impact mechanism is generally designated by the reference numeral 10.
- the air cushion impact mechanism is generally designated by the reference numeral 10.
- adjoining components of a power driven hammer or percussion hammers and the attached tool in the FIG. 1 not shown.
- the air cushion impact mechanism 10 can be used both for a hammer drill, d. H. a driven hammer, which can also transmit a rotary motion to the tool, as well as used in a percussion hammer.
- the corresponding motor drive takes place for example via an electric motor, which can be connected to a battery or a power line as a power source.
- the air cushion impact mechanism 10 includes a housing 12 in which an axially movable drive piston (not shown), an axially movable impactor or racket 20 and a axially movable striker or striker 30 along a longitudinal axis L of the housing 12 back and forth are movably received.
- the housing 12 is sleeve-shaped and comprises two housing parts 14 and 16, which are axially displaceable relative to each other along the longitudinal axis L.
- a front ie the tool facing the end of the second housing part 16 is received, as in particular in FIGS. 2 to 4 is clearly visible.
- front refers to the end of the impact mechanism facing the tool (in FIG. 1 and 3a - 4 right), while “back” denotes the opposite end (in FIG. 1 and 3a - 4 left is.
- axial and radial in the present description are each related to the longitudinal axis L.
- the axially movable within the second housing part 16 drive piston (not shown) transmits via a trapped between the drive piston and the impactor 20, first air cushion 80 a striking energy, which drives the striker 20 in the direction of the firing pin 30.
- the drive piston is in this case driven, for example via a connecting rod by a crankshaft, which is rotated by the electric motor, so that the drive piston in the housing 12 performs an axially oscillating movement. In the same way, driven by the first air cushion 80, the striker 20 moves.
- the racket 20 has a sealing groove 22 in which a sealing element, for example an elastic sealing ring 52 (cf. FIG. 3a ), which is on the inner peripheral surface of the second housing part 16 abuts and thereby achieves a seal of the air cushion 80.
- a sealing element for example an elastic sealing ring 52 (cf. FIG. 3a ), which is on the inner peripheral surface of the second housing part 16 abuts and thereby achieves a seal of the air cushion 80.
- the drive piston may comprise a sealing element.
- the impactor 20 in turn drives the firing pin 30.
- the moving impact mass of the impactor 20 transmits upon impact with the firing pin a pulse, which this in turn on a tool 36 (FIG. FIG. 4 ) transmits.
- the tool 36 is attached to a tool holder 34 which is formed separately from the striker 30. Alternatively, however, other design options are conceivable.
- the tool holder 34 At rest, the tool holder 34 is located with its inclined contact surface 30a (see. FIG. 4 ) on a corresponding contact shoulder 12a of the housing sleeve 12 (cf. FIGS. 3a and 3b ). If a surface is now to be machined with the aid of the motor-driven drilling or percussion hammer, the tool 36 is pushed backwards, ie in the direction of the impactor 20, as a result of the resistance of this surface to be machined. In response, the striker 30 also displaces the striker 20 rearwardly and thus moves it from an idle position to a working position, as described in more detail below.
- a rebound damping with an elastic damping element 60, a bearing sleeve 62 for supporting the firing pin 30 and a stop plate 64 is provided.
- the elastic damping element 60 can also assume a sealing function, but essentially serves to damp a return pulse from the firing pin 30 on the stop plate 64.
- seals 54 and 56 are also seals 54 and 56 (FIGS. FIG. 3a )intended.
- the second air cushion 40 unlike the first air cushion 80 between the drive piston and the striker 20 is not intended to transmit a drive pulse, but instead damps a shock of the impactor 20 and so a transmission from the striker 20 to the striker 30 at idle to prevent the machine. This is particularly desirable when idle the percussion 10 of the striker 20 and the drive piston trailing. Here blank clearances of the impact mechanism 10 are to be prevented in order to reduce the resulting significant loads of percussion components, such as the impactor 20 and striker 30, and to avoid premature failure of the air cushion impact mechanism 10.
- the housing 12 on its housing parts 14 and 16 more vents 12b and 50 on.
- the first vent openings 50 which are arranged axially with respect to the tool 36 further back, serve for ventilation of the rear ie first air cushion 80, wherein the first air cushion 80 is to be vented at idle of the impact mechanism 10.
- the vent holes or vents 50 are formed on the second housing part 16 such that they are arranged offset in a drive position or impact position of the striking mechanism 10 relative to the air cushion 80 (see, for example FIG. 4 , here the vents 50 are arranged axially in front of the seal 52 of the racket 20).
- the drive piston moves the striker 20 in a last blank in the direction forward until the firing pin 30 comes with its contact surface 30a on the shoulder 12a of the housing sleeve 12 to the plant.
- the racket 20 passes over with its seal 52, the ventilation openings 50, whereby the first air cushion 80 is also displaced forward and can be vented through the vents 50.
- the front, second vent openings 12b shown are formed by vent holes in the respective housing parts 14 and 16.
- the first housing part 14 and the second housing part 16 each have vent holes 14b and 16b, which in an idle position (see. FIG. 3b ) are arranged offset relative to each other, whereby the second air cushion 40 is substantially sealed and allows damping of voids of the racket 20.
- an impact position of the air cushion impact mechanism 10 see. FIG.
- the two housing parts 14 and 16 are axially displaced relative to each other so that the two respective vent holes 14b and 16b at least partially aligned with each other and thereby together form the second vent openings 12b, through which the second air cushion 40 can be vented (indicated by the with Lu designated arrows in FIG. 4 ).
- guide grooves 14a are provided in the first housing part, engage in the corresponding guide pins 16a of the second housing part. Furthermore, between the housing part 14 and 16, a return spring 18 ( FIGS. 1 . 3a - 4 ) is provided, which in a relative movement of the housing parts 14 and 16 in a position in which the second ventilation holes 14b and 16b are aligned with each other, is biased. Then, when the air bag impact mechanism 10 enters a state of idling, in which the second vent holes 14b and 16b are not aligned with each other, the housing parts 14 and 16 are reset by means of the stored spring force. This is too Note that by pressing the tool (in the working position) and the front, first housing part 14 performs a relative movement in the direction of the second, rear housing part 16.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011081711A DE102011081711A1 (de) | 2011-08-29 | 2011-08-29 | Luftpolster-Schlagwerk für einen motorisch angetriebenen Bohr- oder Schlaghammer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2564985A1 true EP2564985A1 (fr) | 2013-03-06 |
EP2564985B1 EP2564985B1 (fr) | 2017-01-04 |
Family
ID=46934441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12181795.1A Not-in-force EP2564985B1 (fr) | 2011-08-29 | 2012-08-24 | Méchanisme de percussion à coussin d'air pour marteau perforateur ou burineur motorisé |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2564985B1 (fr) |
DE (1) | DE102011081711A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4353416A1 (fr) * | 2022-10-12 | 2024-04-17 | Hilti Aktiengesellschaft | Outil électrique |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1969990U (de) | 1967-07-31 | 1967-10-05 | Hilti Ag | Umschaltvorrichtung fuer elektro-pneumatische bohrhaemmer. |
DE2641070A1 (de) * | 1976-09-11 | 1978-03-16 | Bosch Gmbh Robert | Motorisch angetriebener schlaghammer mit luftfederung |
DE3826213A1 (de) | 1988-08-02 | 1990-02-15 | Bosch Gmbh Robert | Bohr- oder schlaghammer |
DE3932134A1 (de) * | 1989-09-27 | 1991-04-04 | Bosch Gmbh Robert | Hammer mit luftfederschlagwerk |
US5873418A (en) * | 1996-03-29 | 1999-02-23 | Makita Corporation | Percussive tool having a reduced impact at the start of percussive operation |
DE19810088C1 (de) | 1998-03-10 | 1999-08-26 | Bosch Gmbh Robert | Bohr- und/oder Schlaghammer mit in Abhängigkeit von der Einstecktiefe eines Werkzeuges aktivierbarem Schlagwerk |
EP1464449A2 (fr) * | 2003-04-01 | 2004-10-06 | Makita Corporation | Outil électrique |
DE102006056848A1 (de) | 2006-12-01 | 2008-06-05 | Robert Bosch Gmbh | Pneumatisches Schlagwerk einer Handwerkzeugmaschine |
WO2008126481A1 (fr) * | 2007-03-28 | 2008-10-23 | Makita Corporation | Outil à percussion |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009002238A1 (de) * | 2009-04-07 | 2010-10-14 | Robert Bosch Gmbh | Schlagsteuerungsvorrichtung |
-
2011
- 2011-08-29 DE DE102011081711A patent/DE102011081711A1/de not_active Ceased
-
2012
- 2012-08-24 EP EP12181795.1A patent/EP2564985B1/fr not_active Not-in-force
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1969990U (de) | 1967-07-31 | 1967-10-05 | Hilti Ag | Umschaltvorrichtung fuer elektro-pneumatische bohrhaemmer. |
DE2641070A1 (de) * | 1976-09-11 | 1978-03-16 | Bosch Gmbh Robert | Motorisch angetriebener schlaghammer mit luftfederung |
DE3826213A1 (de) | 1988-08-02 | 1990-02-15 | Bosch Gmbh Robert | Bohr- oder schlaghammer |
DE3932134A1 (de) * | 1989-09-27 | 1991-04-04 | Bosch Gmbh Robert | Hammer mit luftfederschlagwerk |
US5873418A (en) * | 1996-03-29 | 1999-02-23 | Makita Corporation | Percussive tool having a reduced impact at the start of percussive operation |
DE19810088C1 (de) | 1998-03-10 | 1999-08-26 | Bosch Gmbh Robert | Bohr- und/oder Schlaghammer mit in Abhängigkeit von der Einstecktiefe eines Werkzeuges aktivierbarem Schlagwerk |
EP1464449A2 (fr) * | 2003-04-01 | 2004-10-06 | Makita Corporation | Outil électrique |
DE102006056848A1 (de) | 2006-12-01 | 2008-06-05 | Robert Bosch Gmbh | Pneumatisches Schlagwerk einer Handwerkzeugmaschine |
WO2008126481A1 (fr) * | 2007-03-28 | 2008-10-23 | Makita Corporation | Outil à percussion |
Also Published As
Publication number | Publication date |
---|---|
DE102011081711A1 (de) | 2013-02-28 |
EP2564985B1 (fr) | 2017-01-04 |
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