EP0194347B1 - Gefederte Anbringung einer die Haltegriffe tragenden Schutzhaube an einem Schlagwerkzeug - Google Patents

Gefederte Anbringung einer die Haltegriffe tragenden Schutzhaube an einem Schlagwerkzeug Download PDF

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Publication number
EP0194347B1
EP0194347B1 EP85115109A EP85115109A EP0194347B1 EP 0194347 B1 EP0194347 B1 EP 0194347B1 EP 85115109 A EP85115109 A EP 85115109A EP 85115109 A EP85115109 A EP 85115109A EP 0194347 B1 EP0194347 B1 EP 0194347B1
Authority
EP
European Patent Office
Prior art keywords
hammer
cowl
motor
housing
swing arms
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
Application number
EP85115109A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0194347A1 (de
Inventor
Gmbh & Co. Kg Wacker-Werke
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.)
Wacker Werke GmbH and Co KG
Original Assignee
Wacker Werke GmbH and Co KG
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 Wacker Werke GmbH and Co KG filed Critical Wacker Werke GmbH and Co KG
Publication of EP0194347A1 publication Critical patent/EP0194347A1/de
Application granted granted Critical
Publication of EP0194347B1 publication Critical patent/EP0194347B1/de
Expired legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04Handles; Handle mountings
    • B25D17/043Handles resiliently mounted relative to the hammer housing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/11Arrangements of noise-damping means

Definitions

  • the invention relates to a motor-driven hammer according to the preamble of patent claim 1.
  • the protective hood has the task of protecting the operator from the heat radiation from the hot engine parts and of direct contact with them, damping the noise radiation from the engine into the environment, in particular also towards the operator, and the operator To protect against current surges, which can occur in devices of this type by z. B. when working with a chisel, an underground cable is struck or - with electric hammers - carelessness damages the own supply cable from the motor and dangerous voltages are transmitted to the motor parts of the hammer.
  • the protective hood fulfills the further task of cushioning the handle and thus preventing health damage from the operator and increasing the ease of use for the operator.
  • the protective hood is supported at several points on the hammer housing by means of simple springs. Under certain operating conditions, this can cause the protective hood to tilt relative to the hammer housing. The protective hood is then in direct contact with the hammer housing and largely loses its functionality with regard to the fulfillment of the task assigned to it according to the above.
  • the protective hood of the known hammers is also largely reduced in function with increasing working pressure exerted by the operator on the handles. The same also applies to a pull on the handles, which the operator z. B. has to spend when trying to rip out a chisel that has jammed in the concrete while working with the hammer.
  • hammers with handles sprung by means of torsion springs are known, for example from GB-A-1071643.
  • the invention has for its object to design hammers according to the preamble of claim 1 so that the protective hood has no way to come into contact with the hammer housing that both handles, so left and right, regardless of the size of the operator Exerted pressure are always cushioned equally that a bumping of the sprung hood with the hammer housing is excluded even under high pressure and tensile forces exerted by the operator on the handles and that the handle cushioning in the normal working area is very soft in normal work, so that for the Operators can hardly feel any vibrations.
  • the swing arms provided according to the invention, arranged and attached to the protective hood and motor housing result in permanent forced parallel guidance of the protective hood with respect to the hammer housing and reliably prevent any tilting.
  • the suspension of the swing arms via torque bushings enables a very flat, largely linear spring characteristic in the normal working area, and the limitation of this normal working area by elastic stops with progressively increasing spring characteristics allows the application of high tensile and compressive forces on the handles without the risk of bumping.
  • With the protective hood hammers can be operated in an unprecedented way, be it with a combustion engine, be it with an electric motor or other motors.
  • the hammer according to FIGS. 1 to 3 has a hammer housing 1, which also includes the motor parts to which other parts can be attached.
  • motor not shown, it can be a combustion or electric motor, in principle also a different type of energy source, e.g. B. act a hydraulic motor or pneumatic motor.
  • the hammer housing 1 is enclosed on all sides by a protective hood 2, which at least surrounds the motor area, but can also extend over at least part of the hammer shaft 3 in which the hammer mechanism is located.
  • the protective hood 2 is inevitably guided parallel to the longitudinal axis of the hammer and carries the normal handles 5 arranged on both sides as well as the additional handle 6 which the operator requires to implement the device and to direct the hammer.
  • the parallel guidance between the hammer 1, 3 and the protective hood 2 is provided by two pairs of swing arms 7a, 7b and 8a, 8b, which are arranged on one or the other side parallel to one another and one above the other in it and one end each on the protective hood 2 and the other end are each rotatably mounted on the hammer housing 2.
  • the arms 7a, 7b, 8a and 8b each have stub axles 9 which extend from them perpendicular to the protective hood or to the hammer housing.
  • the stub axles 9 at the corresponding one ends of the swing arms simply engage in bearing bores in bearing blocks 10 on the protective hood 2, while the stub axles located at the corresponding other ends of the swivel arms with torsion bushes fastened in the hammer housing 1 11 are rotatably connected, the z. B. sit circumferentially rotatably in the hammer housing 1.
  • the torsion bushes have a relatively large elasticity, so that they provide a soft cushioning of the swing arms 7a, 7b, 8a and 8b against the hammer housing 1, the spring force of which changes only little over a relatively large range of mutual parallel displacement of the hammer housing 1 and protective hood 2.
  • the aforementioned range of movement with soft cushioning between the hammer housing 1 and protective hood 2 or the corresponding pivoting range of the swing arms is elastically limited by resiliently cooperating stops 12, 13 and 14, 15 between the protective hood 2 and the hammer housing 1, the stops 12, 13 the Limitation in one relative movement direction and the stops 14, 15 effect the limitation in the opposite direction.
  • the cooperating stops 12, 13 on the one hand and 14, 15 on the other hand each consist of a rigid stop 12 or 14 attached to the inside of the protective hood and a counter stop 13 or 15 made of an elastic material, which is fastened to the hammer housing 1 in each case. Shape and material of these elastic stops 13 and 15 are chosen so that for the interacting stops 12, 13 and 14, 15 a progressive spring characteristic, for. B. that shown in Fig. 7 results. A particularly suitable for creating such a spring characteristic is z.
  • Elastic polyurethane is also particularly suitable for the torsion bushings, but is not foamed.
  • the respective upper and the lower swing arms 7a, 8a, and 7b, 8b are rigidly connected to one another by connecting links 16, which each form a swing arm with them.
  • Such a rigid connection is particularly recommended where the protective hood 2 does not have such inherent rigidity that it alone can force the swing arms to be forced.
  • the protective hood 2 is so high that it does not come into contact with the upper side of the hammer housing 1 even with the strongest rated pressure or rated pull on the handles 5.
  • the interacting stops 12, 13 on the one hand and 14, 15 on the other hand can be designed with different progressive spring characteristics for different consideration of tension and pressure. It is also advisable to set up these interacting stops in an adjustable manner (not shown) in order to be able to adapt the spring characteristics to different application tasks of the hammer.
  • FIGS. 4-6 largely corresponds to that according to FIGS. 1-3. The only difference is the arrangement of the pivot and spring points for the swing arms 7a, 7b, 8a, 8b.
  • the stub axles 9 ' engage not only at one end of the respective swing arm in a torsion bushing 11', but also at both ends in such a torsion bushing. At one end are the torsion bushes in the hammer housing and at the other end in bearing blocks 10 'attached to the wall of the protective hood 2 facing the operator. On the protective hood side, the respective upper and lower stub axles 9 'are connected to one another to form a continuous rod, which at the same time effects the rigid connection between the two-sided swing arms 7a, 8a and 7b, 8b.
  • the distribution of the torsional elasticity over all eight stub axles or pivot points does require a greater effort, but results in an even more favorable suspension characteristic for the normal working area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP85115109A 1984-12-24 1985-11-28 Gefederte Anbringung einer die Haltegriffe tragenden Schutzhaube an einem Schlagwerkzeug Expired EP0194347B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843447401 DE3447401A1 (de) 1984-12-24 1984-12-24 Hammer mit schutzhaube
DE3447401 1984-12-24

Publications (2)

Publication Number Publication Date
EP0194347A1 EP0194347A1 (de) 1986-09-17
EP0194347B1 true EP0194347B1 (de) 1989-02-01

Family

ID=6253896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85115109A Expired EP0194347B1 (de) 1984-12-24 1985-11-28 Gefederte Anbringung einer die Haltegriffe tragenden Schutzhaube an einem Schlagwerkzeug

Country Status (4)

Country Link
US (1) US4673043A (enrdf_load_stackoverflow)
EP (1) EP0194347B1 (enrdf_load_stackoverflow)
JP (1) JPS61159387A (enrdf_load_stackoverflow)
DE (1) DE3447401A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105965447A (zh) * 2015-03-10 2016-09-28 松下知识产权经营株式会社 旋转冲击工具

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DK168471B1 (da) * 1987-06-01 1994-04-05 Breakers As Tohåndsbetjent, vibrationsdæmpet maskinhåndtag.
GB8907410D0 (en) * 1989-04-01 1989-05-17 Macdonald Pneumatics Paving breakers and supports therefor
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JP2003501282A (ja) * 1999-06-10 2003-01-14 マクドナルド、エアー、トゥールズ、リミテッド 空気ツール
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DE10136015A1 (de) * 2001-07-24 2003-02-13 Bosch Gmbh Robert Handwerkzeugmaschine mit vibrationsgedämpftem Handgriff
JP2003145446A (ja) * 2001-11-09 2003-05-20 Yamada Kikai Kogyo Kk エンジンブレーカ
US8047302B2 (en) * 2001-12-21 2011-11-01 Wacker Neuson Produktion GmbH & Co. KG Drilling and/or striking hammer with a lubricating device
GB2402098B (en) * 2003-05-21 2007-10-17 Black & Decker Inc Vibration reduction apparatus for power tool and power tool incorporating such apparatus
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GB2407790A (en) * 2003-11-04 2005-05-11 Black & Decker Inc Vibration reduction apparatus for a power tool
DE10357758A1 (de) * 2003-12-10 2005-07-21 Wacker Construction Equipment Ag Aufbruch- und/oder Bohrhammer mit linear geführter Griffeinrichtung
DE102004019776A1 (de) * 2004-04-23 2005-11-17 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer
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DE102004041219A1 (de) * 2004-08-26 2006-03-02 Robert Bosch Gmbh Handwerkzeugmaschinengriffvorrichtung mit einer Vibrationsabschirmeinheit
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SE529839C2 (sv) * 2005-05-26 2007-12-04 Atlas Copco Constr Tools Ab Brytverktyg med avvibrerad handtagsanordning
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JP5728338B2 (ja) 2011-09-07 2015-06-03 株式会社マキタ 電動工具用集塵装置及び電動工具
DE102011089718A1 (de) * 2011-12-23 2013-06-27 Robert Bosch Gmbh Werkzeugmaschine
JP6125392B2 (ja) * 2013-09-27 2017-05-10 株式会社マキタ 打撃工具
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GB201518088D0 (en) * 2015-10-13 2015-11-25 Black & Decker Inc Pavement Breaker
CN106089029A (zh) * 2016-07-31 2016-11-09 成都聚合追阳科技有限公司 一种聚光光伏发电系统石头地基打孔机
CN106246100A (zh) * 2016-07-31 2016-12-21 成都聚合追阳科技有限公司 一种聚光光伏发电系统石头地基打孔工艺
WO2018153226A1 (en) * 2017-02-23 2018-08-30 The Hongkong Polytechnic University Improved passive vibration reducing apparatus
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Publication number Priority date Publication date Assignee Title
CN105965447A (zh) * 2015-03-10 2016-09-28 松下知识产权经营株式会社 旋转冲击工具

Also Published As

Publication number Publication date
JPH0375314B2 (enrdf_load_stackoverflow) 1991-11-29
US4673043A (en) 1987-06-16
JPS61159387A (ja) 1986-07-19
DE3447401A1 (de) 1986-07-03
EP0194347A1 (de) 1986-09-17
DE3447401C2 (enrdf_load_stackoverflow) 1988-09-08

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