EP4324598A1 - Dispositif de raccordement d'outil pour un marteau perforateur ou burineur - Google Patents

Dispositif de raccordement d'outil pour un marteau perforateur ou burineur Download PDF

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Publication number
EP4324598A1
EP4324598A1 EP22190885.8A EP22190885A EP4324598A1 EP 4324598 A1 EP4324598 A1 EP 4324598A1 EP 22190885 A EP22190885 A EP 22190885A EP 4324598 A1 EP4324598 A1 EP 4324598A1
Authority
EP
European Patent Office
Prior art keywords
tool
tool holder
blow
adjusting sleeve
impact
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.)
Pending
Application number
EP22190885.8A
Other languages
German (de)
English (en)
Inventor
Daniel Seltmann
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
Priority to EP22190885.8A priority Critical patent/EP4324598A1/fr
Publication of EP4324598A1 publication Critical patent/EP4324598A1/fr
Pending 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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/20—Devices for cleaning or cooling tool or work
    • 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
    • B25D2217/0061—Details related to cleaning or cooling the tool or workpiece related to cooling

Definitions

  • the present invention relates to a tool receiving device for a drill or chisel hammer, comprising a tubular tool receiving body with a distal receiving opening for a tool, for the end stop of which a coaxially rear-mounted impact ram of an impact unit is provided, the tubular tool receiving body interacting with a locking mechanism penetrating its wall area, whose pawl elements, which are arranged along the circumference of the tool holder body and held in the locked position by spring force, can be moved into the unlocked position by means of an external adjusting sleeve by axial displacement for removing the inserted tool.
  • the field of application of the invention extends primarily to hand-held power tools, such as in particular a hammer drill or a chisel hammer.
  • a chisel hammer the drive energy generated by a rotary drive unit, usually an electric motor, is converted into a linear back and forth movement to act on a chisel as a tool.
  • This linear working movement is additionally supplemented with a rotary working movement for the tool, which is designed in particular as a drill.
  • compressed air can also be used as drive energy.
  • a pneumatic drill or chisel hammer usually has higher performance than electrically powered devices.
  • a generic tool holder device for a drill or chisel hammer emerges.
  • This essentially consists of a tubular tool receiving body with a receiving opening extending backwards from its front end for a shaft of a drill or chisel as a tool, which has at least one axial groove.
  • This axial groove works together with a locking mechanism that penetrates the wall area of the tubular tool holder body.
  • the locking mechanism comprises a locking body inserted into a passage opening in the wall of the tool receiving body, which can consist of several pawl elements and, in a locked position, supports the tool against radial outward displacement and engages in the associated at least one axial groove when the tool is inserted.
  • the locking mechanism further comprises a support ring which is axially movable between a position supporting the locking body in the locked position and a position defining the unlocked position of the locking body.
  • the support ring is pressurized by a spring in the direction of displacement towards the locked position.
  • the tool holder device can be operated between the locked position and the unlocked position by manual axial displacement via an external adjusting sleeve.
  • Adjusting sleeves for tool holder devices of the type described above are usually designed in such a way that system separation from the rest of the device is achieved with an impact unit consisting of a drive motor and a downstream gearbox.
  • This conventional design serves, on the one hand, to ensure a relative movement between the adjacent components without the risk of a collision and, on the other hand, provides the prerequisite for easy interchangeability, which also simplifies assembly.
  • the cooling air flowing through the impact unit of the device must be kept Usually generated by a fan attached to the drive motor, it is blown out of the device before the tool holder device.
  • the adjusting sleeve of the tool holding device which essentially forms this outer surface, is usually made of a metal, the contact safety of the entire adjusting sleeve can also be impaired in extreme cases due to the thermal conductivity.
  • the invention includes the technical teaching that the adjusting sleeve of the locking mechanism of a drill or chisel hammer has at least one blow-out opening for discharging an air flow that cools the tool receiving area.
  • the tool receiving area is understood to mean the interior area of the tool receiving device, which is located essentially within the adjusting sleeve, which is located on the distal receiving opening for the Tool can be provided with an additional dust protection cap.
  • this functionality can also be integrated into the shape of the adjusting sleeve.
  • the cooling air flow for the tool holding area is preferably branched off from the cooling air flow for the impact unit, i.e. the drive motor and gear, and directed in the direction of the tool holding device.
  • the cooling air flow for the impact unit i.e. the drive motor and gear
  • gaps or grooves running in the axial direction must be provided between adjacent components or axial channels in them.
  • the solution according to the invention ensures the realization of an active local cooling function by redesigning the adjusting sleeve, which is usually provided solely for actuating the locking mechanism, by introducing at least one blow-out opening and a cooling air guide between relatively movable internal components of the tool holder device. Thanks to the functionally integrated adjusting sleeve and the cooling air-carrying components, the cooling performance in the tool receiving area is significantly improved, so that contact safety is always guaranteed, even at high performance. In addition, thanks to active cooling, the service life of elastomer seals and plastic parts is increased. In addition, the solution according to the invention offers the advantage that dust entry from the tool receiving area into the area of the impact unit is avoided, which reduces drive wear. In addition, the working area of the tool is constantly cleaned by the escaping cooling air, so that there is always a clear view of the processing area.
  • the adjusting sleeve preferably extends over the entire free length of the tool holder device up to the main body of the device surrounding the impact unit. In order to ensure a relative movement between the two components, the adjusting sleeve should protrude into the front end of the main body of the device, for which a slight clearance fit is sufficient. Alternatively, the adjusting sleeve can of course also create an overlap with the main body of the device on the outside. The axial extent of the area to be overlapped must be dimensioned so that electrical safety for the user is guaranteed.
  • the adjusting sleeve consists of several sleeve sections of different diameters, with the at least one blow-out opening being arranged in the shoulder area between adjacent sleeve sections.
  • the diameters of the sleeve sections expand from the receiving opening or its dust protection cap towards the main body of the device.
  • several blow-out openings with an axial flow direction can be introduced at several shoulders, which further increases the cooling performance and the blow-out performance of the tool holder device.
  • the at least one blow-out opening can each consist of a ring of individual openings distributed along the circumference of the associated shoulder section of the adjusting sleeve. This creates a cooling air flow that acts homogeneously along the circumference of the adjusting sleeve.
  • a first blow-out opening is introduced in a shoulder section of the adjusting sleeve arranged in the area of the locking mechanism in order to dissipate the frictional heat locally generated by the locking mechanism directly to the outside.
  • the pawl elements of the locking mechanism in positive interaction with the tool shaft and the resulting movement play, generate a significant proportion of the frictional heat in the tool receiving area, which can be dissipated to the outside in the shortest possible way through efficient heat convection.
  • a second blow-out opening can be introduced in a shoulder section of the adjusting sleeve arranged in the area of the impact plunger in order to Frictional heat generated by the impact unit is also dissipated directly to the outside. This is because the contact point between the impact plunger of the impact unit and the end face of the tool shank forms a further area within the tool holding device that generates frictional heat, which can also make a significant contribution to heat at higher outputs.
  • the impact unit is preferably designed electro-pneumatically in a manner known per se.
  • a chisel hammer essentially consists of an electro-pneumatic impact unit 2 housed in a main body 1, which consists of an electric drive motor 3 with a downstream gear 4.
  • the gearbox 4 converts the drive rotary movement of the drive motor 3 into an alternating linear impact movement, which is transmitted in the direction of the tool holder 5.
  • a tool 6 in the form of a chisel is inserted into the tool holder 5 and held there.
  • the tool receiving device 5 comprises a tubular tool receiving body 7 with a distal receiving opening 8 for inserting the tool 6 - not shown here. Its end stop is formed by a coaxially rearwardly arranged impact plunger 9 of the impact unit 2, which is only partially illustrated here.
  • the tubular tool holder body 7 cooperates with a locking mechanism 10 which penetrates radially into its wall area.
  • the locking mechanism 10 includes pawl elements 12 arranged along the circumference of the tool receiving body 7 and held in a locked position by a spring 11 and, among other components known per se, also an axial bearing 13 serving as a counter bearing and is actuated in a conventional manner by means of an outer adjusting sleeve 14. The actuation is carried out by an axial displacement of the outer adjusting sleeve 14, so that the locking mechanism 10 can be unlocked by axial displacement in the direction of the main body 1 of the chisel hammer in order to remove an inserted tool from it.
  • the adjusting sleeve 14 is also provided with blow-out openings 15a and 15b for discharging an air flow that cools the tool receiving area.
  • This cooling air flow for the tool receiving area is branched off from the cooling air flow of the impact unit 2 - which is only partially shown here - and transferred into the tool receiving area via axial grooves in a sliding sleeve 16 enclosed by the main body 1.
  • the adjusting sleeve 14 consists of several sleeve sections 14a to 14c, of different diameters, which gradually expand from the dust protection cap 16 in the area of the receiving opening 8 towards the main body 1 of the chisel hammer.
  • the blow-out openings 15a and 15b are arranged in assigned intermediate shoulder sections 14x and 14y between adjacent sleeve sections 14a to 14c and thereby ensure an essentially axial flow of the emerging cooling air towards the tool.
  • the first blow-out opening 15a is introduced into a shoulder section 14x of the adjusting sleeve 14 arranged in the area of the locking mechanism 10, in order specifically to achieve this to dissipate frictional heat generated by the locking mechanism 10 directly to the outside.
  • the second blow-out opening 15b is introduced into a branch section 14y of the adjusting sleeve 14 arranged in the area close to the impact plunger 9 in order to dissipate the frictional heat generated by the impact unit 2 directly to the outside.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP22190885.8A 2022-08-18 2022-08-18 Dispositif de raccordement d'outil pour un marteau perforateur ou burineur Pending EP4324598A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22190885.8A EP4324598A1 (fr) 2022-08-18 2022-08-18 Dispositif de raccordement d'outil pour un marteau perforateur ou burineur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22190885.8A EP4324598A1 (fr) 2022-08-18 2022-08-18 Dispositif de raccordement d'outil pour un marteau perforateur ou burineur

Publications (1)

Publication Number Publication Date
EP4324598A1 true EP4324598A1 (fr) 2024-02-21

Family

ID=82942694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22190885.8A Pending EP4324598A1 (fr) 2022-08-18 2022-08-18 Dispositif de raccordement d'outil pour un marteau perforateur ou burineur

Country Status (1)

Country Link
EP (1) EP4324598A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19626254A1 (de) * 1996-06-29 1998-01-08 Bosch Gmbh Robert Elektrohandwerkzeugmaschine
DE19915393A1 (de) 1998-04-07 1999-10-14 Denso Corp Fahrzeug-Heizgerät
EP1666213A1 (fr) * 2004-12-06 2006-06-07 HILTI Aktiengesellschaft Outil électrique
EP3875224A1 (fr) * 2020-03-03 2021-09-08 Hilti Aktiengesellschaft Dispositif de réglage d'un ciseau

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19626254A1 (de) * 1996-06-29 1998-01-08 Bosch Gmbh Robert Elektrohandwerkzeugmaschine
DE19915393A1 (de) 1998-04-07 1999-10-14 Denso Corp Fahrzeug-Heizgerät
EP1666213A1 (fr) * 2004-12-06 2006-06-07 HILTI Aktiengesellschaft Outil électrique
EP3875224A1 (fr) * 2020-03-03 2021-09-08 Hilti Aktiengesellschaft Dispositif de réglage d'un ciseau

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