EP1446266B1 - Support d'outil pour marteau - Google Patents

Support d'outil pour marteau Download PDF

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Publication number
EP1446266B1
EP1446266B1 EP02781180A EP02781180A EP1446266B1 EP 1446266 B1 EP1446266 B1 EP 1446266B1 EP 02781180 A EP02781180 A EP 02781180A EP 02781180 A EP02781180 A EP 02781180A EP 1446266 B1 EP1446266 B1 EP 1446266B1
Authority
EP
European Patent Office
Prior art keywords
tool
tool holder
locking
locking body
axially
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.)
Expired - Lifetime
Application number
EP02781180A
Other languages
German (de)
English (en)
Other versions
EP1446266A1 (fr
Inventor
Norbert Hahn
Andreas Hanke
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP1446266A1 publication Critical patent/EP1446266A1/fr
Application granted granted Critical
Publication of EP1446266B1 publication Critical patent/EP1446266B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0076—Angular position of the chisel modifiable by hand
    • 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
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • 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
    • B25D2217/0057—Details related to cleaning or cooling the tool or workpiece
    • B25D2217/0065—Use of dust covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/57—Elastomers, e.g. rubber
    • 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
    • B25D2250/101—Emitting warning signals, e.g. visual or sound
    • 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
    • B25D2250/131—Idling mode of tools

Definitions

  • This invention relates to a tool holder for a hand held electrically powered hammer and to a hand held electrically powered hammer incorporating such a tool holder.
  • this invention relates to tool holders for demolition hammers.
  • Such hammers generally comprise a housing within which is located an electric motor and a gear arrangement for converting the rotary drive of the motor to a reciprocating drive to drive a piston within a hollow spindle or cylinder, which spindle is located within the hammer housing.
  • a ram is located in front of the piston within the spindle so as, in normal operating conditions, to form a closed air cushion within the spindle between the piston and the ram.
  • the reciprocation of the piston reciprocatingly drives the ram via the air cushion.
  • a hollow piston arrangement may be used.
  • a beatpiece is generally located within the spindle and transmits repeated impacts that it receives from the ram to a tool or bit releaseably mounted for limited reciprocation in front of the beatpiece in a tool holder portion. The impacts on the tool or bit are transmitted to a workpiece against which the tool or bit is pressed in order to break up or make a bore in the workpiece.
  • Some hammers may also be employed in combination impact and drilling mode in which the tool holder, and hence the tool inserted therein, will be caused to rotate at the same time as the tool is struck by the beatpiece.
  • the present invention is also applicable to such hammers.
  • a common form of chiselling tool or bit, for performing heavy duty work is a so called hex-shanked tool or bit.
  • An example of the shank end, ie. the end inserted into the tool holder portion of a hammer is shown in Figures 6a to 6d .
  • the portion of the tool which is locked within the tool holder of the hammer has a hexagonal transverse cross-section.
  • the bore in the tool holder which receives the hexagonal shank portion generally has a corresponding hexagonal transverse cross-section. Accordingly, the tool can be fitted within the tool holder in one of six orientations.
  • the hexagonal portion is formed on one of its flats with an axially extending groove which is closed at both its ends.
  • the hex-shanked tool can be locked within the tool holder by a locking body of the tool holder engaging in the groove to enable limited reciprocation of the tool within the tool holder.
  • a cross bolt arrangement is used to lock the tool within the tool holder.
  • the bolt extends tangentially of the toolholder to engage the groove in the tool.
  • the bolt can be retracted or pivoted outwardly to allow insertion or removal of the tool.
  • Such tool holders do not provide any damping of the forward impact from the tool when the hammer enters idle mode.
  • a type of tool holder comprising a radially shiftable locking body which can be releaseably locked within the groove of a tool inserted into the tool holder.
  • Such a tool holder is ergonomic and can be designed to provide damping of the forward impact from the tool when the hammer enters idle mode. This reduces the maximum impact force which has to be withstood by the tool holder main body.
  • the SDS-type bits have a tool shank which is insertable into the bit holder in one orientation only because the bits are provided with suitably positioned axially extending grooves, open at their rearward end in the tool shank which co-operate with radially inwardly extending splines in the bore of the tool holder.
  • the standard tool shank is the hex-shanked tool described above and the problem arises that it is possible to insert a hex-shanked bit completely into a tool holder in a wrong orientation so that the axial groove in the tool does not face the locking body of the tool holder.
  • the present invention aims to overcome at least some of the problems discussed above by providing an ergonomic design of tool holder with a radially moveable locking body suitable for use with a hex-shanked tool or bit and which prevents inadvertent insertion of the tool into the tool holder in the incorrect orientation for the locking body to engage the groove of the hex-shanked tool holder.
  • the invention also aims to provide such a tool holder design which can absorb the forward impact from the tool on entry into idle mode.
  • a tool holder for an electrically powered hammer comprising the combined features of claim 1.
  • the tool holder release sleeve has to be manually axially shifted in order to enable a hex-shanked bit to be inserted into the forward end of the tool holder body. Then if the hex-shanked bit is inadvertently inserted into the forward end of the tool holder in the incorrect orientation, so that the locking body cannot engage in the groove in the tool to lock the tool in the tool holder, the user of the tool is warned by the continued positioning of the manually actuable tool holder release sleeve in its released position.
  • the rearward end of the slot in the forward end of the tool holder body prevents the locking body from moving to a radially outward position rearward of the locking member which means that the tool release sleeve has to be axially shifted manually to enable the locking body to move into a radially outward position to allow insertion of a tool.
  • An impact damping arrangement which is mounted on the tool holder body against axially forward movement is located forwardly of the locking bodv to prevent the locking body from moving into a radially outward position forward of the locking member when the locking member is in its locked position.
  • the forward impact from the tool is transferred to the locking body and the forward impact from the locking body is damped by the impact damping arrangement before it is transmitted to the tool holder body. This means that the maximum impact that has to be absorbed by the tool holder body is significantly reduced.
  • the tool release sleeve is biased by at least one spring member into the locked position, thus after the sleeve has been axially shifted into its release position and a hex-shanked bit correctly inserted into the tool holder body, when released by a user the sleeve is urged back into its locked position by the spring member(s).
  • the tool holder may additionally include a biasing member for biasing the locking body forwardly within the slot. The biasing force provided by the biasing member helps to guide the locking body between its radially outward and inward positions.
  • the biasing member can also be used to bias the locking member forwardly and thereby to biases the tool release sleeve forwardly.
  • the tool release sleeve is axially rearwardly slideable to axially shift the locking member from its locked to its release position.
  • the tool release sleeve can be biased forwardly into its locked position.
  • the locking member may be a locking ring which fits non-rotatably around the forward end of the tool holder body and the tool release sleeve may be non-rotatably mounted on the locking ring to thereby non-rotatably fix the tool release sleeve onto the tool holder body.
  • the use of a locking ring provides a robust locking member for absorbing impacts transmitted from the locking body during use of the hammer when the locking ring locks the locking body in the groove in the hex-shanked tool.
  • the radially outermost surface of the locking body engages the radially innermost surface of the locking member in the locked position and a sloping surface on the locking body which extends radially inwardly of the radially outermost surface of the locking body engages a sloping surface of the locking member which extends radially outwardly of the radially innermost surface of the locking member in the release position.
  • the use of the sloping surfaces prevents the locking body becoming jammed in its movement between its radially inward and radially outward position.
  • the sloping surfaces may be forward and/or rearward facing.
  • a preferred feature of the tool holder is that the forward movement of the locking body within the slot is limited by a damping arrangement which arrangement is axially fixed against forward movement on the forward portion of the tool holder body.
  • the damping arrangement may comprise a metal ring located directly in front of the locking body, a resilient ring for damping the impact, located forwardly of the metal ring and a fixing ring located forwardly of the resilient ring by which axially forward movement of the damping arrangement on the tool holder body is limited.
  • the forward end of the tool holder may be of reduced diameter and may have a radially inward facing surface which has a hexagonal transverse cross-section.
  • an electrically powered hammer preferably having a pneumatic striking mechanism comprising a piston and ram located so as to reciprocate within a hollow spindle, and additionally including a tool holder according to any one of the preceding claims.
  • the tool holder may be located forward of and co-axially with the hollow spindle.
  • a demolition hammer incorporating a tool holder (2) according to the present invention is shown in Figure 5 .
  • the hammer comprises an electric motor (13), a gear arrangement and a piston drive arrangement which are housed within a metal gear housing (not shown) surrounded by a plastic housing (4).
  • a rear handle housing incorporating a rear handle (6) and a trigger switch arrangement (8) is fitted to the rear of the housing (4).
  • a cable (not shown) extends through a cable guide (10) and connects the motor to an external electricity supply.
  • the motor (2) is actuated to rotationally drive the armature of the motor.
  • the motor pinion rotatingly drives a first gear wheel of an intermediate gear arrangement which is rotatably mounted on a spindle, which spindle is mounted in an insert to the gear housing.
  • the intermediate gear has a second gear wheel which rotatingly drives a drive gear.
  • the drive gear is non-rotatably mounted on a drive spindle (5) which spindle is rotatably mounted within the gear housing.
  • a crank plate (30) is non-rotatably mounted at the end of the drive spindle (5) remote from the drive gear, which crank-plate is formed with an eccentric bore for housing an eccentric crank pin (32).
  • the crank pin (32) extends from the crank plate into a bore at the rearward end of a crank arm (34) so that the crank arm (34) can pivot about the crank pin (32).
  • the opposite forward end of the crank arm (34) is formed with a bore through which extends a trunnion pin (36) so that the crank arm (34) can pivot about the trunnion pin (36).
  • the trunnion pin (36) is fitted to the rear of a piston (38) by fitting the ends of the trunnion pin (36) into receiving bores formed in a pair of opposing arms which extend to the rear of the piston (38).
  • the piston is mounted in a cylindrical hollow spindle (40) so that it can reciprocate within the hollow spindle.
  • An O-ring seal is fitted in an annular recess formed in the periphery of the piston (38) so as to form an air tight seal between the piston (38) and the internal surface of the hollow spindle (40).
  • the armature pinion rotatingly drives the intermediate gear arrangement via the first gear wheel and the second gear wheel of the intermediate gear arrangement rotatingly drives the drive spindle via the drive gear.
  • the drive spindle rotatingly drives the crank plate (30) and the crank arm arrangement comprising the crank pin (32), the crank arm (34) and the trunnion pin (36) convert the rotational drive from the crank plate (30) to a reciprocating drive to the piston (38).
  • the piston (38) is reciprocatingly driven back and forth along the hollow spindle (40) when the motor is actuated by a user depressing the trigger switch (8).
  • a ram (58) is located within the hollow spindle (40) forwardly of the piston (38) so that it can also reciprocate within the hollow spindle (40).
  • An O-ring seal is located in a recess formed around the periphery of the ram (58) so as to form an air tight seal between the ram (58) and the spindle (40).
  • a closed air cushion is formed between the forward face of the piston (38) and the rearward face of the ram (58).
  • the hammer After a period of hammering, when the tool (3) fitted in the tool holder is removed from the workpiece, the hammer enters idle mode. With no workpiece to urge the tool rearwardly, the next forward impact from the ram (58) meets with no rearward resistance and the ram (58), beatpiece (64) and tool (3) move forwardly until the forward movement of the tool is halted by the engagment of the locking body (52) with the rearward end of the groove (88) in the tool. As the ram (58) moves forwardly in the hollow spindle (40) it passes over venting holes on the hollow spindle and the air cushion between the piston (38) and the ram (58) is vented.
  • the ram (58) is no longer reciprocatingly driven by the piston (38).
  • Some mechanism is generally employed for holding the ram (58) and/or beatpiece (64) in their forward positions until the tool (3) is again urged against a workpiece to urge the ram (58) and beatpiece (64) into their rearward working positions again in which the air cushion is closed.
  • the last forward impact from ram (58) to the beatpiece (64) is transmitted to the tool (3) which tool transfers the forward impact to the locking body (54) when the rearward end of the groove (88) impacts the rearward end of the locking body (54).
  • a beatpiece (64) is guided so that it can reciprocate within a tool holder body (66) which tool holder body is mounted at the forward end of the hammer housing co-axially with the spindle.
  • the tool holder body is mounted within a flange (68) which is fitted to the main housing of the hammer by a plurality of bolts (not shown) which extend axially through receiving bores (70) in a collar located at the rearward end of the flange (68).
  • the bolts extend into co-operating receiving screw threaded bores formed in the forward part of the main housing of the hammer.
  • a hex-shanked hit or tool (3) can be releasably mounted within the tool holder body (66) so that the tool can reciprocate to a limited extent within the tool holder body (66).
  • the ram (58) When the ram (58) is in its operating mode and is reciprocatingly driven by the piston (38) the ram repeatedly impacts the rearward end of the beatpiece (64) and the beatpiece (64) transmits these impacts to the rearward end of the tool (3) as is known in the art. These impacts are then transmitted by the tool (3) to the material being worked.
  • the tool holder (2) of the hammer of Figure 5 is shown in more detail in Figures 1 to 4 .
  • the tool holder (2) comprises a tube-like tool holder body (66).
  • the tool holder body had a relatively large internal diameter cylindrical portion at its rearward end for housing the beatpiece (64) and a relatively small diameter hexagonally cross-sectioned portion at its forward end for receiving the shank of a hex-shanked tool (3) of the type shown in Figures 6A to 6D .
  • a single axially extending slot (10) is formed in the hexagonally cross-sectioned portion of the tool holder body (66) through which a single locking body (54) extends.
  • the locking body (54) is prevented from radially outward movement by a locking ring (52) which extends around the hexagonally cross-sectioned portion of the tool holder body (66).
  • the locking ring (52) has a radially inward facing face which has a generally hexagonal transverse cross-section, except for a recess in said face for accommodating the locking body (54).
  • the locking ring Due to the hexagonal transverse cross-section of the radially outwardly facing face of the hexagonally cross-sectioned portion of the tool holder body (66), the locking ring is non-rotatable on said portion of the tool holder body.
  • the locking ring (52) has an irregularly shaped radially outwardly facing surface which is non-rotatably received within a co-operating recess of a tool release sleeve (50).
  • the recess in the tool release sleeve (50) is formed by a rearwardly facing internal shoulder formed in the tool release sleeve. In this manner the tool release sleeve (50) is non-rotatably mounted on the tool holder body via the locking ring (52).
  • the locking body (54) and locking ring (52) are urged axially forwardly by a biasing sleeve (27) which has a recessed forward facing face (27a) with a raised rim (27b).
  • the recessed forward face (27a) bears on the rearward end of the locking body (54) and the raised rim (27b) bears on the locking ring (52).
  • the biasing sleeve (27) is urged forwardly by a first small diameter compression spring (26).
  • a second larger diameter compression spring (24) bears against the tool release sleeve (50) to urge it axially forwardly.
  • the tool holder release sleeve (50) is also forwardly biased by the biasing sleeve (27) via the locking ring (52).
  • the forward end (24a) of the compression spring (24) is mounted within an axially extending recess formed in the tool release sleeve (50).
  • the springs (24, 26) are mounted at their rearward ends on parts of an arrangement for adjusting the orientation of the tool holder body (66) within the flange (68), which arrangement comprises an actuation sleeve (12) and a lock ring (4) and is not described further here.
  • the forward movement of the locking body (54) is limited by a damping mechanism for damping the forward impact to the locking body (54) when the hammer enters idle mode.
  • the damping arrangement comprises an axially tapered metal ring (72) located in front of the locking body (54) and the locking ring (52) which is non-rotatably mounted over the hexagonal portion of the tool holder body (66).
  • a resilient ring (74) In front of the metal ring (72) is located a resilient ring (74) which is also mounted over the hexagonal portion of the tool holder body (66).
  • the rings (72, 74) are held in place against axially forward movement by a washer (78) which is non-rotatably fitted over the hexagonal portion of the tool holder body (66) and held in place by a snap ring (79) which is fitted into an annular recess (80) formed in the radially outwardly facing surface of hexagonal portion of the tool holder body (66).
  • a resilient rubber nose ring (82) is snap fitted over the forward portion of the hexagonal portion of the tool holder body (66) so that part of the nose ring (82) is retained in an annular recess (84) formed in the radially outwardly facing surface of hexagonal portion of the tool holder body (66).
  • the locking ring (52) is held against axially forward movement by the damping mechanism (72, 74, 78) and by the tool release sleeve (50) which is itself prevented against axially forward movement by the resilient ring (74) of the damping mechanism and by the nose ring (82).
  • the last impact is transmitted to the locking body (54).
  • This impact is transmitted via the metal ring (72), the resilient ring (74) and the washer (78) to the tool holder body (66).
  • the resilient ring damps this impact, so that the impact transmitted to the tool holder body is less that the impact transmitted to the locking body (54). This means that the maximum force that has to be withstood by the tool holder body is reduced, which eases the design constraints regarding for example, materials and dimensions, for the tool holder body.
  • the axially extending slot (10) formed in the hexagonal portion of the tool holder body (66) extends only a small distance rearwardly of the rearward end of the locking body (54). This means that the locking body cannot be pushed rearwardly of the locking ring (52) when a tool (3) is inserted into the tool holder body (66) and so cannot be moved radially outwardly automatically by the insertion of a tool. Instead to insert a hex-shanked tool the locking sleeve (50) must be moved axially rearwardly against the force of the springs (24,26) into the position shown in Figures 3 and 4 .
  • a pocket (42) formed within the sleeve (50) is moved radially outwardly of the locking body (54), thus enabling the locking body (54) to move radially outwardly to allow a hex shanked tool to be fitted into the tool holder body (66). If the hex-shanked tool is inserted into the tool holder in the correct orientation, then once the locking groove (88) in the hex-shanked tool (3) is aligned with the locking body (54), the sleeve (50) can be released and moves forwardly into its locked position by the action of the springs (24,26).
  • the locking body (54) As the sleeve moves forwardly (to the left in the Figures) into its locked position the locking body (54) is pushed radially inwardly into its locked position by the locking ring (52) due to the engagement of the sloped edges of the locking ring (52) and locking body (54). In the locked position the locking body (54) and the tool release sleeve (50) are in the position shown in Figures 1 and 2 . The locking body (54) is maintained in the locking groove (88) of the hex shanked tool by the locking ring (52).
  • the location of the locking body (54) in the pocket (42) prevents forward motion of the tool release sleeve (50) and so when the tool release sleeve (50) is released by a user, it remains in its rearward position, as shown in Figures 3 and 4 .
  • the tool release sleeve (50) will not move forwardly into its unlocked position unless the orientation of the tool is correct. This is because if the hex-shanked tool is not correctly oriented there is no locking groove (88) radially inwardly of the locking body (54) for the locking body (54) to move into.
  • a flat side (89) of the hex shanked tool prevents the locking body (54) from moving radially inwardly from its locked position and so the locking body is locked in the pocket (42) in the sleeve (50) by a flat side of the tool.
  • the user will notice that the tool release sleeve (50) has not moved forwardly into its locked position, firstly because the user will notice that the sleeve (50) has not moved forwardly on release and secondly because it will remain positioned axially shifted from its locked position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (17)

  1. Porte-outil (2) pour marteau électrique, comprenant :
    ■ un corps de porte-outil (66) de forme tubulaire qui peut être adapté sur l'avant du marteau ou formé sur celui-ci, et ayant une extrémité avant pour recevoir de manière non rotative une tige (3) de coupe transversale hexagonale d'un outil ou embout à tige hexagonale, ladite extrémité avant étant formée avec une seule fente (10) s'étendant dans le sens axial ;
    ■ un corps de verrouillage unique (54) s'étendant à travers ladite fente pour venir en prise de manière libérable avec une rainure (88) s'étendant dans le sens axial formée dans un outil à tige hexagonale adapté dans ladite extrémité avant du corps de porte-outil (66) ;
    ■ un élément de verrouillage (52) qui, dans une position verrouillée, verrouille le corps de verrouillage dans une position orientée vers l'intérieur dans le sens radial dans laquelle le corps de verrouillage peut venir en prise avec la rainure dans l'outil, et qui, dans une position de dégagement, permet le déplacement du corps de verrouillage dans une position orientée vers l'extérieur dans le sens radial pour permettre à un outil d'être inséré dans l'extrémité avant du corps de porte-outil ou d'être retiré de celle-ci ;
    ■ un manchon de dégagement d'outil à actionnement manuel (50) qui est déplaçable pour déplacer l'élément de verrouillage de sa position verrouillée à sa position de dégagement afin de permettre l'insertion d'un outil et de permettre le retrait d'un outil de l'extrémité avant du corps de porte-outil ;
    ■ le manchon de dégagement d'outil à actionnement manuel (50) pouvant coulisser dans le sens axial pour décaler dans le sens axial l'élément de verrouillage (52) de sa position verrouillée à sa position de dégagement de sorte que lorsqu'un outil à tige hexagonale est inséré dans l'extrémité avant du corps de porte-outil dans une orientation non correcte, le corps de verrouillage (54) est piégé par la tige de l'outil dans sa position orientée vers l'extérieur dans le sens radial pour empêcher le mouvement axial du manchon de dégagement d'outil (50) de sa position de dégagement à sa position verrouillée ;
    caractérisé en ce qu'une bague d'amortissement d'impact (72) qui est montée sur le corps de porte-outil (66) contre un mouvement vers l'avant dans le sens axial, est positionnée en avant du corps de verrouillage (54) et empêche le corps de verrouillage (54) de se déplacer dans une position orientée vers l'extérieur dans le sens radial en avant de l'élément de verrouillage (52) quand l'élément de verrouillage (52) est dans sa position verrouillée.
  2. Porte-outil selon la revendication 1, dans lequel l'extrémité arrière de la fente (10) dans l'extrémité avant du corps de porte-outil (66) empêche le corps de verrouillage (54) de se déplacer vers une position orientée vers l'extérieur dans le sens radial en arrière de l'élément de verrouillage (52).
  3. Porte-outil selon l'une quelconque des revendications précédentes, dans lequel le manchon de dégagement d'outil (50) est sollicité par au moins un élément de ressort (24, 25) dans la position verrouillée.
  4. Porte-outil selon l'une quelconque des revendications précédentes, comprenant en outre un élément de sollicitation (27, 27') pour solliciter le corps de verrouillage (54) vers l'avant à l'intérieur de la fente (10).
  5. Porte-outil selon la revendication 4, dans lequel l'élément de sollicitation (27, 27') sollicite l'élément de verrouillage (52) vers l'avant et sollicite ainsi le manchon de dégagement d'outil (50) vers l'avant.
  6. Porte-outil selon l'une quelconque des revendications précédentes, dans lequel le manchon de dégagement d'outil (50) peut coulisser axialement vers l'arrière pour décaler axialement l'élément de verrouillage (52) de sa position verrouillée à sa position de dégagement.
  7. Porte-outil selon la revendication 6 en ce qu'elle dépend de la revendication 4, dans lequel le manchon de dégagement d'outil (50) est sollicité dans le sens avant.
  8. Porte-outil selon l'une quelconque des revendications précédentes, dans lequel l'élément de verrouillage est une bague de verrouillage (52) qui est montée de manière non rotative autour de l'extrémité avant du corps de porte-outil (66).
  9. Porte-outil selon l'une quelconque des revendications précédentes, dans lequel la surface la plus externe dans le sens radial du corps de verrouillage (54) vient en prise avec la surface la plus interne dans le sens radial de l'élément de verrouillage (52) dans la position verrouillée, et une surface inclinée sur le corps de verrouillage qui s'étend radialement vers l'intérieur de la surface la plus externe du corps de verrouillage vient en prise avec une surface inclinée de l'élément de verrouillage qui s'étend radialement vers l'extérieur de la surface la plus interne dans le sens radial de l'élément de verrouillage dans la position ou les positions de dégagement.
  10. Porte-outil selon la revendication 9, dans lequel les surfaces inclinées sont orientées vers l'avant et/ou vers l'arrière.
  11. Porte-outil selon l'une quelconque des revendications précédentes, dans lequel le mouvement avant du corps de verrouillage (54) dans la fente (10) est limité par un dispositif d'amortissement (72, 74, 78), ledit dispositif étant axialement fixé contre un mouvement vers l'avant sur la partie avant du corps de porte-outil (66).
  12. Porte-outil selon la revendication 11, dans lequel le dispositif d'amortissement comprend une bague métallique (72), une bague élastique (74) située en avant de la bague métallique et une bague de fixation (78) située en avant de la bague élastique (74).
  13. Porte-outil selon l'une quelconque des revendications précédentes, dans lequel l'extrémité avant du corps de porte-outil est de diamètre réduit.
  14. Porte-outil selon l'une quelconque des revendications précédentes, dans lequel l'extrémité avant du porte-outil a une surface orientée vers l'intérieur dans le sens radial qui a une coupe transversale hexagonale.
  15. Marteau électrique comprenant un porte-outil selon l'une quelconque des revendications précédentes.
  16. Marteau selon la revendication 15, comprenant un mécanisme de percussion pneumatique comprenant un piston et un vérin positionnés de manière à effectuer un mouvement de va-et-vient à l'intérieur d'une broche creuse.
  17. Marteau selon la revendication 16, dans lequel le porte-outil est positionné en avant de la broche creuse et de manière coaxiale à celle-ci.
EP02781180A 2001-09-12 2002-09-09 Support d'outil pour marteau Expired - Lifetime EP1446266B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB0121955.9A GB0121955D0 (en) 2001-09-12 2001-09-12 Tool holder for hammer
GB0121955 2001-09-12
PCT/EP2002/010076 WO2003022531A1 (fr) 2001-09-12 2002-09-09 Support d'outil pour marteau

Publications (2)

Publication Number Publication Date
EP1446266A1 EP1446266A1 (fr) 2004-08-18
EP1446266B1 true EP1446266B1 (fr) 2009-04-01

Family

ID=9921901

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02781180A Expired - Lifetime EP1446266B1 (fr) 2001-09-12 2002-09-09 Support d'outil pour marteau

Country Status (5)

Country Link
EP (1) EP1446266B1 (fr)
AT (1) ATE427192T1 (fr)
DE (1) DE60231824D1 (fr)
GB (1) GB0121955D0 (fr)
WO (1) WO2003022531A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007028486A1 (de) * 2007-06-21 2008-12-24 Robert Bosch Gmbh Werkzeughalter für ein Elektrowerkzeug, insbesondere für einen Meißel- und/oder Bohrhammer
JP5290825B2 (ja) 2009-03-24 2013-09-18 株式会社マキタ 電動ハンマ
JP5534940B2 (ja) * 2010-05-25 2014-07-02 株式会社マキタ 打撃工具
US10814468B2 (en) 2017-10-20 2020-10-27 Milwaukee Electric Tool Corporation Percussion tool
EP3743245B1 (fr) 2018-01-26 2024-04-10 Milwaukee Electric Tool Corporation Outil à percussion

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7429418U (de) * 1974-08-31 1976-03-11 Robert Bosch Gmbh, 7000 Stuttgart Werkzeughalter an einer handwerkzeugmaschine
DE3536132A1 (de) * 1985-10-10 1987-04-16 Bosch Gmbh Robert Werkzeughalter
DE4310835A1 (de) * 1993-04-02 1994-10-06 Bosch Gmbh Robert Bohr- und/oder Schlaghammer
DE19827172B4 (de) * 1998-06-18 2006-11-09 Robert Bosch Gmbh Werkzeughalter, insbesondere für Bohr-oder Schlaghämmer
JP3759322B2 (ja) * 1998-10-08 2006-03-22 株式会社マキタ 携帯工具のビット装着装置
GB9910599D0 (en) * 1999-05-08 1999-07-07 Black & Decker Inc Rotary hammer
DE19950393B4 (de) * 1999-10-12 2013-07-11 Black & Decker, Inc. Werkzeugaufnahme für einen Bohr- oder Meisselhammer
DE10105406A1 (de) * 2001-02-07 2002-08-08 Bosch Gmbh Robert Werkzeughalter für eine Handwerkzeugmaschine

Also Published As

Publication number Publication date
EP1446266A1 (fr) 2004-08-18
ATE427192T1 (de) 2009-04-15
WO2003022531A1 (fr) 2003-03-20
DE60231824D1 (de) 2009-05-14
GB0121955D0 (en) 2001-10-31

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