EP3496903A1 - Porte-outil - Google Patents

Porte-outil

Info

Publication number
EP3496903A1
EP3496903A1 EP17743363.8A EP17743363A EP3496903A1 EP 3496903 A1 EP3496903 A1 EP 3496903A1 EP 17743363 A EP17743363 A EP 17743363A EP 3496903 A1 EP3496903 A1 EP 3496903A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
tool holder
holder according
receiving space
holes
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
Application number
EP17743363.8A
Other languages
German (de)
English (en)
Other versions
EP3496903B1 (fr
Inventor
Josef Fünfer
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP3496903A1 publication Critical patent/EP3496903A1/fr
Application granted granted Critical
Publication of EP3496903B1 publication Critical patent/EP3496903B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B25D17/08—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
    • 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
    • B25D2217/0042—Ball-shaped locking members
    • 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
    • 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
    • B25D2222/42—Steel
    • 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
    • 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
    • B25D2250/065—Details regarding assembling of the tool
    • 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

Definitions

  • the present invention relates to a tool holder for a hand-held machine tool, in particular a chiselling hand-held machine tool.
  • US 2013 056940 describes a tool holder for a chisel hammer.
  • the tool holder has a tubular body made of steel.
  • the main body has a prismatic-hexagonal receiving space for receiving a chisel.
  • the chisel is secured by spherical locking bodies, which partially engage in the receiving space.
  • An actuating ring forces in a locking position the engagement of the locking body in the receiving space.
  • a user may move the actuating ring to an unlocking position to allow the locking bodies to completely exit the receiving space, whereupon the bit may be withdrawn from the receiving space.
  • the body is exposed to considerable mechanical stress.
  • the user drives the chisel into the ground and supports the cracking of the ground by a pressure transverse to the longitudinal axis.
  • the occurring static and dynamic shear forces are transmitted through the main body of the tool holder.
  • a high dynamic load results with empty strikes of the chisel.
  • the chisel is accelerated by the percussion mechanism, but releases its kinetic energy to the main body, as it is not pressed against the ground.
  • the repetitive movement of the bit in the receiving space in the typically dusty environment leads to abrasive wear and concomitant heat development.
  • the main body can heat up to temperatures of over 100 ° C.
  • the tool holder according to the invention for a portable power tool has a base body, one or more locking bodies and an actuating ring movably arranged on the base body between a locking position and an unlocking position.
  • the main body has a receiving space for Picking up a tool.
  • the locking body are arranged lying in radial openings of the body.
  • the actuating ring forces in the locking position engagement of the locking body with the receiving space and triggers in the unlocked position the forced engagement of the locking body with the receiving space.
  • the main body is formed from a metallic framework with at least one perforated sleeve and a plastic body in which the metallic framework is embedded.
  • the rigid metallic sleeve gives the basic body in conjunction with the plastic sufficient mechanical stability.
  • the perforation improves the embedding in the plastic.
  • the sleeve is perforated by a plurality of holes, the proportion of which is on the surface of the sleeve between 10% and 50%.
  • a diameter of the holes preferably corresponds to a maximum of five times a wall thickness of the further sleeve.
  • the plastic body fills the holes.
  • An embodiment provides that a length of the sleeve corresponds at least to the length of the receiving space.
  • the framework has a cage made of guide rails, which are arranged adjacent to the sleeve on the sleeve.
  • the cage is positively connected directly to the sleeve.
  • the cage is partially flat against the sleeve in order to improve heat exchange.
  • the cage and the sleeve are formed of different steels.
  • the framework has a further perforated sleeve, which surrounds the sleeve in the radial direction.
  • An embodiment provides that the further sleeve is perforated with a plurality of holes, the proportion of which is on the surface of the sleeve between 10% and 50%.
  • a diameter of the holes corresponds to a maximum of five times a wall thickness of the further sleeve.
  • An embodiment provides that the plastic body fills a closed in the radial direction between the sleeve and the other sleeve gap.
  • Fig. 1 a chisel hammer
  • Fig. 2 is a tool holder
  • Fig. 3 is a framework
  • Fig. 4 is a carrier sleeve
  • Fig. 6 is an outer sleeve
  • Fig. 1 shows schematically, as an example of a chiseling hand tool, a chisel hammer 1.
  • the chisel hammer 1 has a tool holder 2 into which a shank end of a tool, e.g. one of the chisel 3, can be used.
  • a primary drive of the chisel hammer 1 is a motor 4, which drives a striking mechanism 5.
  • a battery pack or a power line 6 supplies the motor 4 with power.
  • a user can lead the chisel hammer 1 by means of a handle 7 and take the chisel hammer 1 into operation by means of a system switch 8.
  • the striking mechanism 5 beats repetitively in the direction of impact 9 on the chisel 3 locked in the tool holder 2.
  • a hammer drill may be provided with an additional rotary drive which rotationally drives the tool holder 2 about the working axis 10.
  • the impact mechanism 5 is a pneumatic striking mechanism 5.
  • An excitation piston 11 and a racket 12 are guided in a guide tube 13 in the striking mechanism 5 along the working axis 10 movable.
  • the excitation piston 11 is coupled via an eccentric 14 to the motor 4 and forced to a periodic, linear movement.
  • a connecting rod connects the eccentric 14 with the excitation piston 11.
  • An air spring formed by a pneumatic chamber 15 between the exciter piston 11 and the racket 12 couples a movement of the racket 12 to the movement of the exciter piston 11.
  • the racket 12 can strike directly on a rear end of the chisel 3 or indirectly transfer part of its momentum to the chisel 3 via a substantially resting striker 16.
  • the Schlagtechnik 5 and preferably the other drive components are arranged within a machine housing 17.
  • Fig. 2 shows schematically the structure of the tool holder 2.
  • the tool holder 2 has a tubular base body 18.
  • the base body 18 is rigidly connected to the machine housing 17, e.g. by a screw connection of a flange 19 of the base body 18.
  • a cavity 9 open in the direction of impact of the main body 18 forms a receiving space 20 for the chisel 3, more precisely its insertion end.
  • the receiving space 20 is cylindrical or prismatic, here for example with a hexagonal cross-section.
  • the cross section corresponds to insertion ends of commercial chisels 3.
  • the chisel 3 can be inserted into the receiving space 20.
  • the bit 3 can be locked and unlocked in the receiving space 20 by means of the locking body 21 and an actuating ring 22.
  • the locking bodies 21 engage in the receiving space 20 and, if necessary, in the locking grooves of the chisel 3 arranged in the receiving space 20 for locking the same.
  • the locking body 21 are radially movable in radial openings 23 of the base body 18.
  • the exemplary locking body 21 are balls, other designs are cylindrical or prismatic.
  • the actuating sleeve 22 prevents in its locking position, that the locking body 21 dodge in the radial direction of the receiving space 20 and out of engagement with the receiving space 20.
  • the exemplary actuating ring 22 holds the locking body 21 adjacent to a radial locking surface 24.
  • the actuating ring 22 can be moved to unlock the bit 3 by the user in an unlocked position, whereupon the locking body 21 relative to the locking surface 24 is moved along the working axis 10 and the receiving space 20 can completely leave in the radial direction. For example, by moving the actuating sleeve 22 in the radial direction of the locking body 21 adjacent cavity is released. In other embodiments, in the locking position in the receiving space 20 engaging pawls can be pivoted in the unlocked position from the receiving space 20. A spring 25 biases the actuating sleeve 22 preferably in the locking position.
  • the main body 18 is constructed of a plastic body 26 and a 26 embedded in the plastic body metal frame 27.
  • the metallic framework 27 consists of several nested and connected shells.
  • a shell is formed by a prismatic (carrier) sleeve 28.
  • a length 29 of the carrier sleeve 28 is preferably equal to or greater than the receiving space 20 of the tool holder 2.
  • the carrier sleeve 28 is preferably perforated.
  • the carrier sleeve 28 has a plurality of holes 30 distributed over the entire surface of the carrier sleeve 28.
  • the holes 30 break through the wall 31 of the carrier sleeve 28.
  • the exemplary holes 30 are circular.
  • a diameter 32 of the holes 30 is between twice to five times the wall thickness 33 of the wall 31.
  • the holes 30 may have other shapes, eg elliptical, rectangular, square, triangular.
  • the surface area of the holes corresponds to the circular holes 30 with the mentioned diameter 32.
  • the holes 30 of the carrier sleeve 28 are preferably of identical design.
  • the holes 30 may be arranged regularly, for example in parallel rows. Alternatively, the holes 30 may be irregularly arranged.
  • the holes 30 preferably have a minimum distance to adjacent holes 30 which is greater than half the diameter 32 of the holes 30, eg greater than the diameter 32.
  • a maximum distance of a hole 30 to the next hole 30 is less than five times the diameter 32, for example, preferably less than three times.
  • the holes 30 have a proportion of at least 10%, for example 20%, 25% of the surface of the carrier sleeve 28.
  • the holes 30 have a proportion of at most 50%, for example 33%, 25% of the surface of the carrier sleeve 28.
  • the carrier sleeve 28 may be bent from a perforated sheet metal
  • a cage 34 of a plurality of guide rails 35 forms an innermost shell.
  • the guide rails 35 form the longitudinal edges of the prismatic receiving space 20.
  • the guide rails 35 have for example an angled profile with an inner angle of about 120 degrees adapted to the hexagonal receiving space 20.
  • a length of the guide rails 35 corresponds to the length of the receiving space 20.
  • the guide rails 35 can be perforated be. The perforation is the same or analogous to the perforation of the support sleeve 28, wherein shape, diameter and arrangement of the holes 36 different, but within the limits mentioned above, to the holes 30 of the support sleeve 28 may be.
  • the guide rails 35 may be directly connected to each other annularly, ie by bridges of the same material as the guide rails 35 themselves.
  • the guide rails 35 are preferably individual separate elements.
  • the guide rails 35 are spaced from each other in the circumferential direction.
  • the cage 34 of guide rails 35 is disposed within the carrier sleeve 28.
  • the guide rails 35 directly contact the carrier sleeve 28.
  • the guide rails 35 can lie flat against the carrier sleeve 28 in the radial direction.
  • the guide rails 35 are anchored in the prismatic support sleeve 28.
  • the guide rails 35 are preferably secured in a form-fitting manner along the working axis 10 in the carrier sleeve 28.
  • the guide rails 35 may have hooks 37, which engage in complementary receiving openings 38 of the support sleeve 28.
  • the guide rails 35 and the carrier sleeve 28 are soldered or welded together.
  • the guide rails 35 are preferably made of a hardened steel.
  • the guide rails 35 may be through hardened. The material of the carrier sleeve 28 and the guide rails 35 differs.
  • An outer shell is formed by a cylindrical (outer) sleeve 39.
  • the outer sleeve 39 surrounds the carrier sleeve 28.
  • the outer sleeve 39 touches the carrier sleeve 28.
  • the outer sleeve 39 is in the radial direction positively against edges 40 of the carrier sleeve 28 at.
  • the carrier sleeve 28 and the outer sleeve 39 may each have an opening 41, 42 for the locking body 21.
  • the size of the openings 41, 42 corresponds to the dimensions of the locking body 21.
  • the expediently equally large openings 41, 42 are arranged opposite one another.
  • the carrier sleeve 28 and the outer sleeve 39 are soldered or welded together.
  • the outer sleeve 39 may be shorter than the carrier sleeve 28.
  • the outer sleeve 39 may protrude on one side over the carrier sleeve 28 along the working axis 10.
  • a wall thickness of the outer sleeve 39 is approximately equal to the wall thickness 33 of the support sleeve 28.
  • the cylindrical outer sleeve 39 is perforated. The perforation is the same or analogous to the perforation of the carrier sleeve 28.
  • the holes 43 of the outer sleeve 39 may differ in shape, diameter 32 and arrangement of the holes 30 of the carrier sleeve 28, but they are subject to the same limits for the dimensions and distances as in a wall thickness 44 of the outer sleeve 39 is preferably equal to the wall thickness 33 of the support sleeve 28.
  • the material of the support sleeve 28 and the outer sleeve 39 are preferably the same, for example, unhardened steel.
  • the metallic framework 27 formed from the three shells carrier sleeve 28, cage 34 and outer sleeve 39 is embedded in a plastic body 26.
  • the plastic body 26 fills the gaps 45 between the individual shells.
  • the plastic body 26 fills in particular the holes 30, 36, 43.
  • the circumscribed by the cage 34 receiving space 20 is hollow.
  • the outer sleeve 39 may also be on the outside of the Be covered plastic body 26.
  • the framework 27 may comprise further sleeves, for example a sleeve 46 forming the flange 19.
  • the wide sleeves 46 are also preferably perforated.

Landscapes

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

Abstract

L'invention concerne un porte-outil (2) pour une machine-outil portative (1), comprenant un corps de base (18), un ou plusieurs corps de verrouillage (21) et une bague d'actionnement (22) agencée sur le corps de base (18) de manière mobile entre une position de verrouillage et une position de déverrouillage. Le corps de base (18) présente un espace de réception (20) destiné à recevoir un outil (3). Les corps de verrouillage (21) sont agencés en position horizontale dans des ouvertures radiales (23) ménagées dans le corps de base (18). Dans la position de verrouillage, la bague d'actionnement (22) provoque de manière forcée un engagement des corps de verrouillage (21) dans l'espace de réception (20) et met fin dans la position de déverrouillage à l'engagement forcé des corps de verrouillage (21) dans l'espace de réception (20). Le corps de base (18) est constitué d'une carcasse métallique (27) comportant au moins un manchon perforé (28) et d'un corps en plastique dans lequel est intégrée la carcasse métallique (27).
EP17743363.8A 2016-08-08 2017-07-31 Porte-outil Active EP3496903B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16183221.7A EP3281750A1 (fr) 2016-08-08 2016-08-08 Porte-outil
PCT/EP2017/069306 WO2018029024A1 (fr) 2016-08-08 2017-07-31 Porte-outil

Publications (2)

Publication Number Publication Date
EP3496903A1 true EP3496903A1 (fr) 2019-06-19
EP3496903B1 EP3496903B1 (fr) 2022-07-20

Family

ID=56681981

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16183221.7A Withdrawn EP3281750A1 (fr) 2016-08-08 2016-08-08 Porte-outil
EP17743363.8A Active EP3496903B1 (fr) 2016-08-08 2017-07-31 Porte-outil

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP16183221.7A Withdrawn EP3281750A1 (fr) 2016-08-08 2016-08-08 Porte-outil

Country Status (2)

Country Link
EP (2) EP3281750A1 (fr)
WO (1) WO2018029024A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI697390B (zh) * 2019-03-26 2020-07-01 程岱有限公司 敲打工具

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2844110A1 (de) * 1978-10-10 1980-04-24 Bosch Gmbh Robert Handwerkzeugmaschine, insbesondere meisselhammer
DE19800998C2 (de) * 1998-01-14 2001-05-17 Roehm Gmbh Bohrfutter mit einem Futterkörper aus Kunststoff
DE10044387A1 (de) * 2000-09-08 2002-04-04 Bosch Gmbh Robert Werkzeughalterung für eine Handwerkzeugmaschine
US9636815B2 (en) 2011-02-23 2017-05-02 Hilti Aktiengesellschaft Tool receptacle

Also Published As

Publication number Publication date
EP3496903B1 (fr) 2022-07-20
WO2018029024A1 (fr) 2018-02-15
EP3281750A1 (fr) 2018-02-14

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