EP0581726B1 - Werkzeug und Werkzeugaufnahme für Handwerkzeuggeräte - Google Patents

Werkzeug und Werkzeugaufnahme für Handwerkzeuggeräte Download PDF

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Publication number
EP0581726B1
EP0581726B1 EP19930810479 EP93810479A EP0581726B1 EP 0581726 B1 EP0581726 B1 EP 0581726B1 EP 19930810479 EP19930810479 EP 19930810479 EP 93810479 A EP93810479 A EP 93810479A EP 0581726 B1 EP0581726 B1 EP 0581726B1
Authority
EP
European Patent Office
Prior art keywords
flank
tool
drive
longitudinal extent
groove
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
EP19930810479
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0581726A1 (de
Inventor
Josef Obermeier
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 EP0581726A1 publication Critical patent/EP0581726A1/de
Application granted granted Critical
Publication of EP0581726B1 publication Critical patent/EP0581726B1/de
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
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0034—Details of shank profiles

Definitions

  • the invention relates to a tool for insertion into a tool holder for chiselling and / or impact drilling hand tool devices with a clamping shank which has at least one axially closed locking groove and at least one rotational driving groove open axially towards the free end of the clamping shaft with two essentially radially extending flanks.
  • the clamping shank of these tools having one or two axially closed locking grooves and one or two rotational driving grooves open axially towards the free end of the clamping shaft.
  • the tool holder which serves to hold these tools, has, according to the number of locking grooves, radially displaceable locking elements, which in the present case are designed in the form of balls.
  • these locking elements which can also be designed as cylinders, for example, ensure that the tools do not fall out of the tool holder.
  • the locking elements can be moved radially in such a way that they disengage from the locking grooves.
  • the aforementioned locking grooves, together with the locking elements interacting with them, are not subject to particularly high stresses, since in operation the tool located in the tool holder is practically floating relative to the locking elements, ie the locking elements, in cooperation with the locking grooves, do not have to transmit any significant forces during operation. Only when the tool is pulled out of a hole in a component do the locking grooves, in cooperation with the locking elements, ensure the connection between the tool and the tool holder.
  • the turning driver grooves which are open axially towards the free end of the clamping shank and in which corresponding driver bars of the tool holder engage, are subject to extremely high stress.
  • these rotary driving grooves are responsible for the entire torque transmission during the operation of the tool.
  • the invention has for its object to provide a tool which is particularly wear-resistant in cooperation with a suitable tool holder that reliable torque transmission is guaranteed.
  • the object is achieved in that the area of the driving-side flank of the rotary driving groove is larger in its projection in the circumferential direction than the corresponding area of the opposite flank.
  • the dimensioning of the rotary driving groove proposed according to the invention leads to an optimal compromise between increasing the transmission surface of the rotating driving groove which is decisive for the torque transmission and avoiding a cross-sectional weakening which has a detrimental effect on the strength of the tool.
  • the term projection in the circumferential direction expresses that the decisive factor for the torque transmission is the ultimately resulting, essentially radial surface, which for example coincides with a radius when the flanks are straight, provided the flanks run radially.
  • the fact that only the flank on the driving side is enlarged in its area means that there is no appreciable cross-sectional weakening of the clamping shank, which has a negative effect on the strength of the tool.
  • a simple possibility of increasing the area of the flank on the driving side expediently consists in the radial dimension of this flank on the driving side of the rotary driving groove being greater than the radial dimension of the opposite flank.
  • the radial dimension of the flank on the driving side corresponds approximately to 1.1 to 1.5 times the radial dimension of the opposite flank.
  • flanks on the driving side advantageously exceeds the longitudinal extent of the opposite flank.
  • the flanks are therefore of unequal length, which leads to a rear wall of the rotary driving groove which is inclined with respect to the circumference of the clamping shaft.
  • the longitudinal extent of the flank on the driving side preferably corresponds to 1.05 to 1.3 times the longitudinal extent of the opposite flank.
  • a respective paired arrangement of locking grooves and rotary driving grooves is provided, with rotary driving grooves and locking grooves expediently being approximately diametrically opposed to one another.
  • the tool holder provided for holding these tools is provided with at least one radially displaceable locking element and at least one driving bar, the driving-side flank of the driving bar having a surface which is larger in projection in the circumferential direction than the corresponding surface of the opposite flank .
  • the area of the driving bar which is decisive for the torque transmission is thereby increased, which on the one hand leads to a reduction in wear and on the other hand enables the driving bars to be made stronger and therefore less susceptible to destruction.
  • the radial dimension of the flank of the driving bar on the driving side is greater than the radial dimension of the flank on the opposite side
  • the longitudinal extent of the flank of the driving bar on the driving side be greater than the longitudinal dimension of the opposite flank.
  • the dimensions of the surfaces of the flank on the driving side can be increased within the scope of the tool, ie the radial dimension of the flank on the driving side can be 1.1 to 1.5 times the radial dimension of the flank on the opposite side and the longitudinal extent of the flank on the driving side can be 1.05. correspond to 1.3 times the length of the opposite flank.
  • FIG. 1 and 2 show a clamping shank 1 of a tool according to the invention.
  • This clamping shaft 1 has two axially closed locking grooves 2 and two rotational driving grooves 3 which are open axially towards the free end of the clamping shaft 1.
  • FIG. 2 shows in particular, flanks 3a, 3b of the rotary driving grooves 3 run essentially radially.
  • the area of the flank 3a on the driving side is larger than the area of the opposite flank 3b, which is caused by an increase in the radial dimension at the flank 3a.
  • FIG. 3 and 4 show a clamping shank 4 of a further embodiment of the tool according to the invention.
  • This clamping shaft 4 is provided with two axially closed locking grooves 5 and two rotational driving grooves 6 which are open axially towards the free end of the clamping shaft 4.
  • the rotary driving grooves 6 have essentially radially extending flanks 6a, 6b, as is particularly illustrated in FIG. 4.
  • the flanks 6a on the driving side of the rotary driving grooves 6 have a larger area than the opposite flanks 6b, which is due to the greater longitudinal extent of the flanks 6a on the driving side compared to the longitudinal extent of the opposite flanks 6b.
  • a tool holder is shown schematically, in which the tool according to Fig. 1 is inserted with the holding shaft 1, locking grooves 2 and driving grooves 3.
  • the tool holder has a guide 7, an actuating sleeve 8 and a cage 9 surrounding the actuating sleeve 8.
  • recesses By displacing the actuating sleeve 8 either axially or in the circumferential direction, recesses (not shown) can be made in the radial projection of locking elements 10, so that these locking elements 10 can yield. This means that the locking elements 10 can disengage from the locking grooves 2 and thereby release the clamping shank 1, so that the tool can be removed from the guide 7 and thus from the tool holder.
  • the guide 7 has driving bars 7a which are provided with essentially radially extending flanks 7b, 7c.
  • the flank 7b on the entraining side has a larger area than the opposite flank 7c, which in the present example comes about by increasing the radial dimension.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP19930810479 1992-07-10 1993-07-06 Werkzeug und Werkzeugaufnahme für Handwerkzeuggeräte Expired - Lifetime EP0581726B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924222744 DE4222744A1 (de) 1992-07-10 1992-07-10 Werkzeug und Werkzeugaufnahme für Handwerkzeuggeräte
DE4222744 1992-07-10

Publications (2)

Publication Number Publication Date
EP0581726A1 EP0581726A1 (de) 1994-02-02
EP0581726B1 true EP0581726B1 (de) 1996-08-21

Family

ID=6462950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930810479 Expired - Lifetime EP0581726B1 (de) 1992-07-10 1993-07-06 Werkzeug und Werkzeugaufnahme für Handwerkzeuggeräte

Country Status (3)

Country Link
EP (1) EP0581726B1 (US06815460-20041109-C00097.png)
DE (2) DE4222744A1 (US06815460-20041109-C00097.png)
DK (1) DK0581726T3 (US06815460-20041109-C00097.png)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPP053097A0 (en) * 1997-11-26 1997-12-18 Ramset Fasteners (Aust.) Pty. Limited Drill bits and holders therefor
AU742424B2 (en) * 1997-11-26 2002-01-03 Illinois Tool Works Inc. Drill bits and holders therefor
DE10357380A1 (de) * 2003-12-05 2005-06-30 Hilti Ag Einsteckende für ein drehendes und/oder schlagendes Werkzeug

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2551125C2 (de) * 1975-11-14 1987-04-23 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung an Handwerkzeugmaschinen zur Drehmomentübertragung
FR2424408A1 (fr) * 1978-04-24 1979-11-23 Stenuick Freres Taillant de perforation pour marteau pneumatique fond-de-trou

Also Published As

Publication number Publication date
DK0581726T3 (US06815460-20041109-C00097.png) 1997-02-24
DE59303488D1 (de) 1996-09-26
EP0581726A1 (de) 1994-02-02
DE4222744A1 (de) 1994-01-13

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