EP0035984A1 - Rückstossdämpfer - Google Patents

Rückstossdämpfer Download PDF

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Publication number
EP0035984A1
EP0035984A1 EP81850038A EP81850038A EP0035984A1 EP 0035984 A1 EP0035984 A1 EP 0035984A1 EP 81850038 A EP81850038 A EP 81850038A EP 81850038 A EP81850038 A EP 81850038A EP 0035984 A1 EP0035984 A1 EP 0035984A1
Authority
EP
European Patent Office
Prior art keywords
percussion tool
impact
recoil
mass
face
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Withdrawn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
EP81850038A
Other languages
English (en)
French (fr)
Inventor
Peter Holzmann
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.)
HOLZMANN SIV ANNA ELEONORA
Original Assignee
HOLZMANN SIV ANNA ELEONORA
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 HOLZMANN SIV ANNA ELEONORA filed Critical HOLZMANN SIV ANNA ELEONORA
Publication of EP0035984A1 publication Critical patent/EP0035984A1/de
Withdrawn legal-status Critical Current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
    • B25D17/24—Damping the reaction force
    • 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
    • B25D2217/0073—Arrangements for damping of the reaction force
    • B25D2217/0076—Arrangements for damping of the reaction force by use of counterweights
    • B25D2217/0092—Arrangements for damping of the reaction force by use of counterweights being spring-mounted

Definitions

  • the present invention relates to a recoil damper, i.e. a device which reduces the impact force of a percussion tool against a recoil receiving face.
  • a prior method of reducing the impact force of the- percussion tool against the recoil receiving face is that the movement of the percussion tool in the recoil direction is caught by resilient means, for example a spring, an air cushion or the like. By this means the released recoil force may be distributed over a longer time, whereby the impact effect is cushioned.
  • resilient suspension means which prevents the recoil forces from being transferred to the fastenings of the machine or to handles by means of which the machine or tool is held. In all the cases, however, the machine performs an equal work in both directions and the recoil force is regarded as an unavoidable and energy consuming secondary effect of the work carried-out.
  • a good resilient suspension of the machine/tool also reduces the possibilities of controlling the machine/tool with precision.
  • the invention aims at making use of the recoil force and turning it so that it will perform useful work in the working direction of the percussion tool. Accordingly, the novelty resides in the recoil force being conceived as a resource.
  • the characteristic feature of the invention is at least one additional mass which is movable in relation to the percussion tool and which is connected to the percussion tool by at least one resilient member, the resiliency of the resilient member being chosen so that the kinetic energy of the mass cooperates with that of the percussion tool at the impact of the percussion tool against the impact face while the kinetic energy of the mass is directed opposite to that of the percussion tool at the impact of the percussion tool against the recoil receiving face.
  • the resilient member there may be used, for example, a helical spring, a gas or air cushion or valve-controlled compressed air.
  • the percussion tool consists of a cylindrical piston having an axial boring into which the mass is inserted.
  • FIG. 1 illustrates the basic idea behind the invention.
  • a percussion tool 1 is movable to-and-fro in a cylindrical housing 2 having an impact face 3 and a recoil receiving face 4.
  • the percussion tool 1 is driven against the impact face 3, for example by means of compressed air, magnetic forces or corresponding means.
  • the drives are conventional and, therefore, are not shown in detail.
  • An axial boring 5 is made in the percussion tool 1, and in this axial boring 5 a recoil damping mass 6 according to the invention is introduced.
  • a spring member 7 in the form of a compression spring connects the mass 6 with the percussion tool 1.
  • One end of the spring 7 is fixed to the part of the mass 6 which is turned towards the recoil receiving face 4, while the other end of the spring is fixed to the end of the percussion tool 1 which is turned towards the recoil receiving face 4.
  • the axial boring 5 may also be covered with a cap 8.
  • FIG. 2 shows a modified embodiment of the recoil damper according to the invention.
  • the percussion tool is here braked gently at the impact against the recoil receiving face 4 by means of an additional compression spring 9 provided between the recoil receiving face 4 and the cap 8 or corresponding means.
  • Another additional compression spring 10 is provided between the part of the mass 6 which is turned towards the impact face 3 and the bottom 11 of the boring 5.
  • the resilient properties of the springs 7, 9 and 10 are adapted so that the mass 6 performs oscillatory movements of such frequency that the units 6 and 1 have the same direction and turn back simultaneously at the impact against the impact face 3, whereby the kinetic energies of these parts coact during performance of useful work, while the kinetic energies of the parts 1 and 6 counteract each other at the impact against the recoil receiving face 4.
  • the mass 6 may carry out one or more oscillations. It is seen that at the impact of the percussion tool 1 against the impact face 3 kinetic energy is released which is determined by the speeds and masses of the units 1 and 6. The efficiency of the device as a whole is accordingly increased.
  • Figure 3 shows a modification of the recoil damper shown in Figure 2.
  • a striking pin 12 extends through an opening 13 which is made centrally in the end of the percussion tool 1 which is turned towards the impact face 3.
  • a weak spring 14 pre-stresses the striking pin 12, so that this pin projects beyond the impact face of the percussion tool 1 which is turned towards the impact face 3.
  • the striking pin 12 is pressed inwards, towards the mass 6. All the springs have been dimensioned so that the mass 6 will engage the striking pin 12 at the same time as the percussion tool 1 engages the impact face 3. Furthermore, the mass 6 is to come into contact with the striking pin 13 when the mass 6 has got its maximum kinetic energy.
  • the percussion tool 1 and the mass 6 may.be made of metal, plastic or other materials, while the springs 7, 9, 10 may consist of helical springs of metal, elastic material, gas or liquid cushions, or valve-controlled compressed air.
  • the percussion tool 1 may be divided into two or more masses. Also the mass 6 may be divided into two or more masses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Vibration Dampers (AREA)
EP81850038A 1980-03-07 1981-03-06 Rückstossdämpfer Withdrawn EP0035984A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8001824 1980-03-07
SE8001824A SE8001824L (sv) 1980-03-07 1980-03-07 Rekyldempare

Publications (1)

Publication Number Publication Date
EP0035984A1 true EP0035984A1 (de) 1981-09-16

Family

ID=20340456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81850038A Withdrawn EP0035984A1 (de) 1980-03-07 1981-03-06 Rückstossdämpfer

Country Status (4)

Country Link
EP (1) EP0035984A1 (de)
JP (1) JPS5718833A (de)
SE (1) SE8001824L (de)
ZA (1) ZA811521B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1439038A1 (de) * 2003-01-16 2004-07-21 Makita Corporation Elektrischer Hammer
US7445056B2 (en) 2003-03-21 2008-11-04 Black & Decker Inc. Vibration reduction apparatus for power tool and power tool incorporating such apparatus
US7451833B2 (en) 2005-06-23 2008-11-18 Black & Decker Inc. Vibration dampening mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1281970B (de) * 1964-06-25 1968-10-31 Reichsbahn Vertreten Durch Den Schwingungstilger fuer Schlaghaemmer
DE2727639A1 (de) * 1977-06-20 1979-01-04 Hilti Ag Pulverkraftbetriebenes bolzensetzgeraet
DE7719277U1 (de) * 1977-06-20 1979-04-12 Hilti Ag, Schaan (Liechtenstein) Pulverkraftbetriebenes bolzensetzgeraet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1281970B (de) * 1964-06-25 1968-10-31 Reichsbahn Vertreten Durch Den Schwingungstilger fuer Schlaghaemmer
DE2727639A1 (de) * 1977-06-20 1979-01-04 Hilti Ag Pulverkraftbetriebenes bolzensetzgeraet
DE7719277U1 (de) * 1977-06-20 1979-04-12 Hilti Ag, Schaan (Liechtenstein) Pulverkraftbetriebenes bolzensetzgeraet

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1439038A1 (de) * 2003-01-16 2004-07-21 Makita Corporation Elektrischer Hammer
US6907943B2 (en) 2003-01-16 2005-06-21 Makita Corporation Electric hammer
US7445056B2 (en) 2003-03-21 2008-11-04 Black & Decker Inc. Vibration reduction apparatus for power tool and power tool incorporating such apparatus
US7533736B2 (en) 2003-03-21 2009-05-19 Black & Decker Inc. Vibration reduction apparatus for power tool and power tool incorporating such apparatus
US7562721B2 (en) 2003-03-21 2009-07-21 Black & Decker Inc. Vibration reduction apparatus for power tool and power tool incorporating such apparatus
US7451833B2 (en) 2005-06-23 2008-11-18 Black & Decker Inc. Vibration dampening mechanism

Also Published As

Publication number Publication date
ZA811521B (en) 1982-03-31
JPS5718833A (en) 1982-01-30
SE8001824L (sv) 1981-09-08

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT

17P Request for examination filed

Effective date: 19820317

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19831214

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HOLZMANN, PETER