GB2276578A - Hammer drill and/or percussion hammer - Google Patents

Hammer drill and/or percussion hammer Download PDF

Info

Publication number
GB2276578A
GB2276578A GB9404663A GB9404663A GB2276578A GB 2276578 A GB2276578 A GB 2276578A GB 9404663 A GB9404663 A GB 9404663A GB 9404663 A GB9404663 A GB 9404663A GB 2276578 A GB2276578 A GB 2276578A
Authority
GB
United Kingdom
Prior art keywords
hammer
locking members
percussion
hammer drill
drill
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.)
Withdrawn
Application number
GB9404663A
Other versions
GB9404663D0 (en
Inventor
Karston Blaier
Karl Frauhammer
Gerhard Meixner
Heinz Schnerring
Frank Mueller
Ulrich Muetschele
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB9404663D0 publication Critical patent/GB9404663D0/en
Publication of GB2276578A publication Critical patent/GB2276578A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084Rotating chucks or sockets
    • B25D17/088Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24Damping the reaction force
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2216/00Details 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
    • B25D2216/0076Angular position of the chisel modifiable by hand
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2217/00Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003Details relating to chucks with radially movable locking elements
    • B25D2217/0038Locking members of special shape

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Description

Hammer drill and/or percussion hammer
Prior Art
2276578 The starting point of the invention is a hammer drill and/or percussion hammer according to the preamble of Claim 1. From DE 35 06 008 Al (= GB 2171340) a similar drill or hammer is known in which the toolholder nevertheless comprises numerous individual component parts, which have to be assembled, and is not very suitable for heavy drills or hammers of the 10kg class. The guides f or the locking members are expensive to manufacture and under heavy loading are subject to wear, which may lead to a jamming or even to the loss of the locking members.
Advantages of the Invention The hammer drill and/or percussion hammer according to the invention having the characterizing features of the independent claim has in contrast thereto the advantage that the toolholder, while of simple construction, also durably withstands heavy loading by powerful percussion mechanisms. This is in particular achieved by improved mounting and guiding of the locking members, whereby the high kinetic energy of the tool during the idling stroke can be effectively dissipated without damage to the locking members, tool shanks and the toolholder.
The measures specified in the dependent cl IMS permit advantageous developments and improvements of the hammer drill and/or percussion hammer indicated in the independent claims. For the axial displacement of the locking members it is particularly advantageous to suspend them in an index ring. The actuating elements can R. 26074 act on the latter at radially far outward points without dispensing with important guide surfaces at the ends of the locking members. The selected position of the actuating elements provides space in the interior for the installation of a securing device for the toolholder.
The guiding of the locking members prevents a tilting of said members, particularly in the case of hard idling strokes. It is also particularly advantageous that the locking members are supported, both radially outwards and forwards, against a guide element mounted resiliently with axial elasticity. Wear on the closed grooves of the tool shank is thereby avoided. In particular a formation of burrs at the ends of the grooves, which otherwise would make it impossible to extract the tool from the toolholder, is prevented.
Drawing One exemplary embodiment of the invention is illustrated in the drawing and explained in greater detail in the following description. Figure 1 shows a partial section through a hammer drill without handles, Figure 2 a longitudinal section through a toolholder of the hammer drill, Figure 3 a cross-section through the mounting sleeve on the line III-III in Figure 2, and Figure 4 a side view of the index ring viewed in the direction IV in Figure 2.
Description of the Exemplary Embodiment
Figure 1 shows an electrically operated hammer'l having a casing 2 and a motor 3 disposed at the rear. The motor 3 drives a percussion mechanism 5 by means of a shaft 4. Said mechanism has a connecting rod 6 which reciprocatingly drives a piston 8 guided in a hammer tube 7. By means of an air cushion the piston 8 drives a striker 9 acting via a punch 10 on a tool which is received at the front in a toolholder 11 and the shank 12 of which, shown in Figure 2, is held in a mounting sleeve 1 -1 R.26074 13. The Punch 10 is shown in a rear position in the top halves of the sections in Figures 1 and 2, and in ' the bottom half of each section is shown in a forward position. Instead of a connecting rod, the percussion mechanism may however also be driven for example by swash plates or eccentrically mounted springs or the like. In addition, a rotary drive, not shown in the examplary embodiment, may be provided for the hammer tube 7, and the hammer 1 may be constructed as a hammer drill and/or percussion hammer.
In Figure 2 the toolholder 11 is shown on a larger scale. By means of a securing device 14 the mounting sleeve 13 can be joined to the casing 2 so as to be non-rotatable relative to the latter. For this purpose locking balls 16 engage in both parts and are movable radially outwards on actuation of a sleeve 15, so that the mounting sleeve 13 is then rotatable relative to the casing 2.
For the rotational driving of the tools the mounting sleeve 13 has striplike rotational drivers 17 which project into corresponding rotational drive grooves formed in the tool shank 12. The tools inserted are locked for example by means of two axially movable locking members 18 which engage in radial through-slots 19 which are cut smooth, with a constant width, in the mounting sleeve 13 and are longer than the locking members 18, so that the latter have considerable axial play. In the axial direction of the mounting sleeve 13 the locking members 18 have an elongated, somewhat parallelepipedal shape, while their inwardly pointing side is cylindrical and rounded at the ends. In the front region 20 of the locking members 18 two wings 21 disposed opposite one another project out laterally, preventing deeper penetration of the locking members 18 into the slots 19 and guiding the looking members 18 in the axial direction on the mounting sleeve 13 (see also Figure 3). In the rear region an actuating arm 22 projects radially outwards and is inserted into an opening 23 provided in an axially projecting tab 24a on an index ring 24 bent R.26074 over at right angles (see Figure 4). Between the actuating arm 22 and the wing 21 the locking member 1.8 is notched to make room f or a driving bow 24b of the tab 24a of the index ring 24. The locking members 18 are preferably precision castings or made by the metal injection moulding (mim) process, in which metal powder is poured into an injection moulding machine and then subjected to sintering treatment.
The index ring 24 lies against a sliding sleeve 25, which can be moved by hand in the axial direction against the force of a compression spring 26 bearing against the rear face of the index ring 24. By its other end the compression spring 26 is supported against the sleeve 15 and therefore against the casing 2.
The locking members 18 are supported radially against a sleeve-like guide element 28. The latter has a widened support portion 29 against which the actuating arms 22 lie radially, and also a support portion 30 which is narrower than said widened portion and against which lies, at least partially, the radially outwardly directed outer surface 27 (Figure 3) of the wings 21. The outer surface 27 and the actuating arms 22 accordingly form support points 22a, 27a for the radial support of the locking members 18 by the support portions 29, 30 of the guide element 28. In addition, the locking members 18 lie with their bevelled front end face 31 against the guide element 28 in the axial direction. The guide element 28 is axially movable within limits, since at the front it is supported against an annular damping element 32 of elastomer material. Said damping element is in turn supported at the front against a washer 33 and a circlip 34 inserted into the mounting sleeve 13. The damping element 32 reduces the mechanical loadings on the locking members 18 and the tool shank 12. In particular, during idling the hard blow between the closed grooves 35 in the tool shank 12 and the rear edges 36 of the locking members 18 is damped.
The axial mounting of the locking members 18 by means of the wings 21, in conjunction with their radial 6:
11 q k R.26074 support in the support portions 29, 30 of the guide element 28, prevents a tilting of the locking members 18. By means of the greatest possible axial distance between the support points 22a. 27a of the locking members 18. the guiding of the locking members 18 can be controlled in an advantageous manner.
The locking members 18 are installed by tilting them inwards by their ends on the side of the actuating arms 22, with the sliding sleeve 25 pulled back against the compression spring 26, and inserting them from the inside into the openings 23. The guide element 28 and the other parts are then pushed onto the mounting sleeve 13.
- 6

Claims (10)

Claims
1. Hammer drill and/or percussion hammer comprising a motor (3) housed in a casing (2), a percussion mechanism (5) guided in a hammer tube (7), and a toolholder (11) having a mounting sleeve (13) into which a shank (12) of a tool can be inserted,, said mounting sleeve (13) having openings for the insertion of axially movable locking members (18), characterized in that the openings are in the form of through-slots (19) which are cut smooth and into which the locking members (18) penetrate, "and in that the looking members (18) have wings (21) which project laterally out of the mounting sleeve (13) and which guide the locking members (18) axially on the mounting sleeve (13)..
2. Hammer drill and/or percussion hammer according to Claim 1, characterized in that the slots (19) are longer than the locking members (18) and the latter are mounted, by means of a damping element (32), elastically forwards in the- axial direction in such a manner as to dissipate energy.
3. Hammer drill and/or percussion hammer according to Claim 1 or 2, characterized in that the locking members (18) are supported at the front and radially outwards against a likewise axially movable guide element (28).
4. Hammer drill and/or percussion hammer according to one of the preceding claims, characterized in that the locking members (18) each have an actuating arm (22) projecting radially outwards and cooperating with a sliding sleeve (25) to open the toolholder (11).
S. Hammer drill and/or percussion hammer according to Claim 4, characterized in that for the movement of the locking members (18) the actuating arm (22) is inserted into an opening (23) in an axially projecting tab (24a) r, R.26074 of an axially movable index ring (24).
6. Hammer drill and/or percussion hammer according to Claim 4, characterized in that the index ring (24) lies against the sliding sleeve (25) on one side and is loaded by a compression spring (26) on the other side.
7. Hammer drill and/or percussion hammer according to one of the preceding claims, characterized in that the looking members (18) are supported radially at support points (22a, 27a) in order to prevent tilting.
8. Hammer drill and/or percussion hammer according to Claim 7, characterized in that the support points (22a, 27a) are spaced at an axial distance from one another.
9. Hammer drill and/or percussion hammer according to one of the preceding claims, characterized in that the locking members (18) are produced by the metal injection moulding (mim) process.
10. A hammer drill and/or percussion hammer sub- stantially as herein described with reference to the accompanying drawings.
GB9404663A 1993-04-02 1994-03-10 Hammer drill and/or percussion hammer Withdrawn GB2276578A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4310835A DE4310835A1 (en) 1993-04-02 1993-04-02 Hammer and / or percussion hammer

Publications (2)

Publication Number Publication Date
GB9404663D0 GB9404663D0 (en) 1994-04-27
GB2276578A true GB2276578A (en) 1994-10-05

Family

ID=6484570

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9404663A Withdrawn GB2276578A (en) 1993-04-02 1994-03-10 Hammer drill and/or percussion hammer

Country Status (5)

Country Link
CH (1) CH687965A5 (en)
DE (1) DE4310835A1 (en)
FR (1) FR2703279A1 (en)
GB (1) GB2276578A (en)
IT (1) IT1273412B (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313566A (en) * 1996-05-30 1997-12-03 Bosch Gmbh Robert Removable tool holder for a hand-held power tool
GB2313801A (en) * 1996-06-05 1997-12-10 Standall Tools Ltd Percussion tool
US5971403A (en) * 1996-12-13 1999-10-26 Hitachi Koko Co., Ltd. Holding device for percussion tool
US6131671A (en) * 1995-12-25 2000-10-17 Makita Corporation Power-driven tool having a mechanism for setting the rotary angle position of a tool bit
EP1052070A2 (en) * 1999-05-08 2000-11-15 Black & Decker Inc. Rotary hammer
CN1069249C (en) * 1995-08-05 2001-08-08 星蒂拉公开股份有限公司 Rotary-impacting-type electric rock drill
GB2360009A (en) * 2000-01-14 2001-09-12 Bosch Gmbh Robert Hand held percussive tool machine
EP1293304A1 (en) * 2001-09-12 2003-03-19 Black & Decker Inc. Tool holder for powered hammer
WO2003022531A1 (en) * 2001-09-12 2003-03-20 Black & Decker Inc. Tool holder for hammer
US6669206B2 (en) 2001-03-07 2003-12-30 Black & Decker Inc. Tool holder for a rotary hammer or chisel hammer
GB2414701A (en) * 2004-06-05 2005-12-07 Black & Decker Inc Rotary spindle for a power tool

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4419826A1 (en) * 1994-06-07 1995-12-14 Bosch Gmbh Robert Tool holder for a hand drill, in particular for a hammer drill, and hand drill with tool holder
DE19827172B4 (en) * 1998-06-18 2006-11-09 Robert Bosch Gmbh Tool holders, in particular for drills or impact hammers
DE10043416A1 (en) * 2000-09-04 2002-03-14 Hilti Ag Striking hand tool with tool holder
DE10243290B4 (en) * 2002-09-18 2007-04-05 Robert Bosch Gmbh tool holder
DE102007000081A1 (en) 2007-02-08 2008-08-21 Hilti Ag Hand tool with pneumatic percussion
DE102007000135A1 (en) 2007-03-08 2008-09-11 Hilti Ag Hand tool with pneumatic percussion
EP4378628A1 (en) * 2022-12-01 2024-06-05 Hilti Aktiengesellschaft Tool holding device for a rotary hammer or chisel hammer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029968A2 (en) * 1979-11-30 1981-06-10 Black & Decker Inc. Tool holder

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3506008A1 (en) * 1985-02-21 1986-08-21 Robert Bosch Gmbh, 7000 Stuttgart TOOL HOLDER
DE3516542A1 (en) * 1985-05-08 1986-11-13 Robert Bosch Gmbh, 7000 Stuttgart TOOL HOLDER
DE8601881U1 (en) * 1986-01-25 1986-03-06 Metabowerke GmbH & Co, 7440 Nürtingen Tool holder, in particular for hammer drill

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029968A2 (en) * 1979-11-30 1981-06-10 Black & Decker Inc. Tool holder

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1069249C (en) * 1995-08-05 2001-08-08 星蒂拉公开股份有限公司 Rotary-impacting-type electric rock drill
US6131671A (en) * 1995-12-25 2000-10-17 Makita Corporation Power-driven tool having a mechanism for setting the rotary angle position of a tool bit
GB2313566B (en) * 1996-05-30 1998-07-08 Bosch Gmbh Robert Coupling for releasably attaching a tool holder to a hand machine tool
GB2313566A (en) * 1996-05-30 1997-12-03 Bosch Gmbh Robert Removable tool holder for a hand-held power tool
GB2313801A (en) * 1996-06-05 1997-12-10 Standall Tools Ltd Percussion tool
GB2313801B (en) * 1996-06-05 2000-01-26 Standall Tools Ltd A tool
US5971403A (en) * 1996-12-13 1999-10-26 Hitachi Koko Co., Ltd. Holding device for percussion tool
EP1052070A3 (en) * 1999-05-08 2003-04-02 Black & Decker Inc. Rotary hammer
EP1052070A2 (en) * 1999-05-08 2000-11-15 Black & Decker Inc. Rotary hammer
GB2360009A (en) * 2000-01-14 2001-09-12 Bosch Gmbh Robert Hand held percussive tool machine
US6527280B2 (en) 2000-01-14 2003-03-04 Robert Bosch Gmbh Hand held power tool
GB2360009B (en) * 2000-01-14 2002-03-27 Bosch Gmbh Robert Hand-held tool machine
US6669206B2 (en) 2001-03-07 2003-12-30 Black & Decker Inc. Tool holder for a rotary hammer or chisel hammer
EP1293304A1 (en) * 2001-09-12 2003-03-19 Black & Decker Inc. Tool holder for powered hammer
WO2003022531A1 (en) * 2001-09-12 2003-03-20 Black & Decker Inc. Tool holder for hammer
EP1972413A2 (en) * 2001-09-12 2008-09-24 Black & Decker, Inc. Tool holder for powered hammer
EP1972413A3 (en) * 2001-09-12 2009-09-09 Black & Decker, Inc. Tool holder for powered hammer
GB2414701A (en) * 2004-06-05 2005-12-07 Black & Decker Inc Rotary spindle for a power tool
US7743846B2 (en) 2004-06-05 2010-06-29 Black & Decker Inc. Rotary spindle for power tool and power tool incorporating such spindle

Also Published As

Publication number Publication date
CH687965A5 (en) 1997-04-15
FR2703279A1 (en) 1994-10-07
ITMI940636A0 (en) 1994-04-01
IT1273412B (en) 1997-07-08
GB9404663D0 (en) 1994-04-27
ITMI940636A1 (en) 1995-10-01
DE4310835A1 (en) 1994-10-06

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)