EP1967328A2 - Machine-outil manuelle dotée d'une sonnette pneumatique - Google Patents

Machine-outil manuelle dotée d'une sonnette pneumatique Download PDF

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Publication number
EP1967328A2
EP1967328A2 EP08102001A EP08102001A EP1967328A2 EP 1967328 A2 EP1967328 A2 EP 1967328A2 EP 08102001 A EP08102001 A EP 08102001A EP 08102001 A EP08102001 A EP 08102001A EP 1967328 A2 EP1967328 A2 EP 1967328A2
Authority
EP
European Patent Office
Prior art keywords
hand tool
lever arm
lever
tool according
striking
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Withdrawn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
EP08102001A
Other languages
German (de)
English (en)
Other versions
EP1967328A3 (fr
Inventor
Josef Fünfer
Michael Schamberger
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 EP1967328A2 publication Critical patent/EP1967328A2/fr
Publication of EP1967328A3 publication Critical patent/EP1967328A3/fr
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • 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
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/191—Ram catchers for stopping the ram when entering idling mode

Definitions

  • the invention relates to an at least partially striking hand tool with pneumatic percussion referred to in the preamble of claim 1.
  • hand tool machines are for. B. formed as a chisel or combi hammer.
  • At least partially hitting hand tool machines tend when you lift off the ground or a workpiece or when breaking the tool of the power tool by the workpiece for reference.
  • a hand-held electropneumatic impactor or rotary hammer known which has a housing arranged in a striking mechanism, which has a striking element, such as a striker.
  • a catching device or braking device for the striking element has a catching element or braking element, which is penetrated by the striking element, wherein the catching element intercepts the striking element when the tool is empty.
  • the catch element is clamped in a guide area under elastic deformation and is still mounted axially displaceable in idle tool in the guide area, whereby a lookup should be prevented.
  • the present invention has for its object to provide an at least partially striking hand tool, which avoids the disadvantages mentioned and reliably avoids a lookup.
  • the at least one brake element is designed as a pivot lever which is pivotally controlled directly via the impact element, wherein the impact element z. B. may be formed as an anvil or as a percussion piston.
  • the impact element z. B. may be formed as an anvil or as a percussion piston.
  • a control contour for the pivot lever is arranged on the impact element, whereby the timing of the response of the braking device in dependence on the stroke of the striking element is preset.
  • a structurally particularly simple solution results when the control contour is arranged in the transition from a first section to a second section, wherein the first section has a larger diameter than the second section, so that the diameter or thickness change of the striking element, such as Doppers or percussion piston forming control contour.
  • the striking element such as Doppers or percussion piston forming control contour.
  • control contour is formed by at least one conical control surface, whereby a trouble-free, low-wear sliding of the adjusting portion of the pivot lever is ensured on the control contour.
  • pivot lever is mounted on an axially fixed pivot bearing the striking element radially opposite pivotally, whereby the pivot lever are axially fixed but pivotally held in the guide.
  • the pivot lever has a first lever arm and a second lever arm, wherein the second lever arm cooperates with the control contour of the striking element.
  • the first lever arm can act as a pure braking section of the pivot lever and have a brake shoe, which cooperates with a lateral surface of the striking element. Due to the design as a two-armed lever, the forces exerted on the first lever arm by the second lever arm forces can be optimized according to the lever set.
  • the second lever arm starting from the pivot bearing has a length which is at least 1.2 times as large as a length of the first lever arm starting from the pivot bearing.
  • the length of the second lever arm is about 2 to 3.5 times as large as the length of the first lever arm, whereby an optimal design of the pivot lever with respect to the force / displacement ratio is achieved.
  • the second lever arm is resiliently biased via an elastic element in the direction of an axial projection of the impact element or directly in the direction of the impact element.
  • the elastic element engages radially outward on the second lever arm and is supported radially outward z. B. on a component of the guide.
  • the elastic element can be z. B. also be set in a recess in the second lever arm, so that it is securely fixed in position.
  • FIG. 1 is a designed as a rotating and hammering combi hammer hand tool 10 reproduced, which has a housing 11 in which a on a can be arranged in a tool holder 14 tool 15 striking mechanism 20, a transmission 13 and a motor 12 are arranged.
  • the impact mechanism 20 is coupled via a shaft (not shown in the figure) with the transmission 13, which translates a rotational movement of the motor 12.
  • the striking mechanism 20 has a guide 21, in which a not shown exciter element, such. B. an excitation piston, is guided back and forth movable.
  • the excitation element is connected to generate a lifting movement during operation of the power tool 10 via a pivotally mounted on this connecting rod (not shown in the figures) with an eccentric on the output shaft of the transmission 13.
  • a percussion piston 23 is further guided axially movable, which cooperates with a likewise axially displaceable guided in the guide 21 and designed as an anvil 24 striking element, are transferred via the blows on the tool 15.
  • the guide 21 is formed in several parts and consists of at least a first guide tube 21 a and a first guide tube 21 a coaxially arranged second guide tube 21 b, wherein the percussion piston 23 in the first guide tube 21 a of the guide 21 is arranged.
  • the striker 24 is by means of further guide elements in the guide 21 the percussion piston 23 in the direction of the tool holder ( Fig. 1 ) led upstream.
  • the striker 24 has a percussion piston 23 facing first portion 26 which has a larger cross-section or diameter than the impact piston 23 facing away from the second section 27 of the striker 24. Between the two sections 26, 27 is a control contour 25 on the outside of the striker 24th trained, the z. B. has two substantially tapered from the first portion 26 to the second portion 27 control surfaces. The control surfaces are z. B. radially opposite locations outside on the striker 24.
  • a designated overall by 30 braking device for the striking element or the striker 24 is arranged.
  • This has at least two trained as a pivot lever 31 brake elements, the pivot bearings 32, which on a support structure 22, such. B. inside a sleeve, are arranged, are pivotally mounted.
  • the pivot lever 31 are arranged symmetrically radially outward around the striker 24 around.
  • the pivot levers 31 each have a pivot arm on both sides of the pivot bearing 32 lying in the axial direction, namely a first lever arm 33 facing the percussion piston 23, on which a brake shoe 36 is formed, and a second lever arm 34 facing away from the percussion piston 23 the control contour 25 on the striker 24 cooperates.
  • the second lever arm 34 At the second lever arm 34 while a further brake shoe 37 is arranged.
  • the brake shoes 36, 37 are arranged on the striker facing sides of the first lever arm 33 and the second lever arm 34.
  • the second lever arm 34 starting from the pivot bearing 32, a length L 2 , which is at least 1.2 times as large as a length L 1 of the first lever arm 33, starting from the pivot bearing 32.
  • the length L 2 of the second lever arm 34 is about 3 times as large as the length L 1 of the first lever arm 33rd
  • Fig. 2 is the hand tool 10 ( Fig. 1 ) in the chisel or hammer drill mode.
  • the striker 24 is impacted on the percussion piston 23 and transmits these shocks to the end of the tool 15.
  • the braking device 30 is inactive and the pivot lever 31 are connected to the brake shoes 36, 37 without force on each of the lateral surfaces 28, 29 of the two sections 26, 27 of the striker 24 at.
  • Fig. 3 beats the tool 15 in the void, ie it is not acted upon by a force in the direction of the striker 24, since the power tool 10 z. B. is no longer pressed by the user to the workpiece to be machined.
  • the striker 24 is hereby further displaced in the direction of the tool 15 while the reciprocating piston continues to move back and forth, whereby the control contour 25 moves against a setting section 38 of the pivot lever 31 and begins to pivot the pivot lever 31 in which the second lever arm 34 radially outside is pressed.
  • Fig. 4 is the braking device 30 with the at least two pivot levers 31 in its braking position, in which both the brake shoe 36 on the first lever arm 33 on the lateral surface 28 and the other brake shoe 37 rest on the second lever arm 34 on the lateral surface 29.
  • the striker 24 is securely held in this braking position of the braking device 30 via the pivot lever 31, whereby a lookup safe is prevented.
  • FIG. 5 is a further embodiment of an inventive impact mechanism 20 of a hand tool 10 ( Fig. 1 ), which thereby differs from that in the FIGS. 1 to 4 reproduced that the pivoting lever 31 designed as a braking element of the braking device 30 at one end of the second lever arm 34 via an elastic element radially outward, z. B. on the second guide tube 21 b or a part associated with this, is supported.
  • the function of the pivot lever 31 and the structure of the braking device 30 and the impact mechanism 20 are otherwise identical to that in the FIGS. 1 to 4 For this reason, full reference is made in this respect to the previous description of the FIGS.
  • the elastic elements 35 ensure that, even with a progressive wear of the brake shoes 36, 37, these in the braking position of the brake device 30 with a sufficient contact pressure (in particular with respect to the other brake shoes 37) on the lateral surfaces 28, 29 of the striker 24 attack.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP08102001A 2007-03-08 2008-02-26 Machine-outil manuelle dotée d'une sonnette pneumatique Withdrawn EP1967328A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007000135A DE102007000135A1 (de) 2007-03-08 2007-03-08 Handwerkzeugmaschine mit pneumatischem Schlagwerk

Publications (2)

Publication Number Publication Date
EP1967328A2 true EP1967328A2 (fr) 2008-09-10
EP1967328A3 EP1967328A3 (fr) 2008-09-24

Family

ID=39493634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08102001A Withdrawn EP1967328A3 (fr) 2007-03-08 2008-02-26 Machine-outil manuelle dotée d'une sonnette pneumatique

Country Status (3)

Country Link
US (1) US20080217039A1 (fr)
EP (1) EP1967328A3 (fr)
DE (1) DE102007000135A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2394793A1 (fr) * 2010-06-10 2011-12-14 HILTI Aktiengesellschaft Machine-outil manuelle dotée d'une sonnette pneumatique et son procédé de contrôle
EP2394794A1 (fr) * 2010-06-10 2011-12-14 HILTI Aktiengesellschaft Machine-outil manuelle dotée d'une sonnette pneumatique

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8636081B2 (en) 2011-12-15 2014-01-28 Milwaukee Electric Tool Corporation Rotary hammer
EP2921265A1 (fr) * 2014-03-18 2015-09-23 HILTI Aktiengesellschaft Machine-outil portative
US12005555B2 (en) * 2020-03-23 2024-06-11 Milwaukee Electric Tool Corporation Rotary hammer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4310835A1 (de) 1993-04-02 1994-10-06 Bosch Gmbh Robert Bohr- und/oder Schlaghammer

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US2308143A (en) * 1941-12-03 1943-01-12 Chicago Pneumatic Tool Co Snubber for tamper bars
US2836247A (en) * 1954-05-17 1958-05-27 Exxon Research Engineering Co Extension of effective length of tubing
DE1603852C3 (de) * 1968-01-29 1975-12-04 Hilti Ag, Schaan (Liechtenstein) Abfangvorrichtung für den Eintreibkolben eines pulverkraftbetriebenen Bolzensetzgerätes
US3915242A (en) * 1974-05-14 1975-10-28 Star Expansion Ind Corp Fastener driving power tool
US3952814A (en) * 1975-03-14 1976-04-27 Mikhail Lvovich Gelfand Impact wrench
FR2324417A1 (fr) * 1975-09-16 1977-04-15 Spit Soc Prospect Inv Techn Dispositif de maintien en position du piston d'un pistolet a tir indirect
US4162033A (en) * 1977-07-20 1979-07-24 Omark Industries, Inc. Powder actuated tool
US4222462A (en) * 1978-10-11 1980-09-16 Ottestad Jack Benton Brake to decelerate axially moving actuating rod
SU945412A2 (ru) * 1978-12-27 1982-07-23 Ордена Трудового Красного Знамени институт гидродинамики СО АН СССР Устройство ударного действи
DE3624153A1 (de) * 1986-07-17 1988-01-28 Bosch Gmbh Robert Motorbetriebener hammer
DE3627869A1 (de) * 1986-08-16 1988-02-18 Bosch Gmbh Robert Schlagwerkabschaltung
DE3819813A1 (de) * 1988-06-10 1989-12-14 Hilti Ag Pulverkraftbetriebenes setzgeraet
SU1662832A1 (ru) * 1988-09-23 1991-07-15 Московское Научно-Производственное Объединение По Механизированному Строительному Инструменту И Отделочным Машинам Машина ударного действи
US5029744A (en) * 1990-06-13 1991-07-09 Hsin-Ho Mfg. Co. Ltd. Mechanism for controlling the powder impact force on a projectile
DE4400779A1 (de) * 1994-01-13 1995-07-20 Duss Maschf Elektropneumatischer Schlag- oder Drehschlaghammer
DE19548870A1 (de) * 1995-12-27 1997-07-03 Hilti Ag Pulverkraftbetriebenes Setzgerät
DE19755730A1 (de) * 1997-12-15 1999-06-17 Hilti Ag Bolzensetzgerät
US6092710A (en) * 1998-06-09 2000-07-25 Berner Gmbh Explosive powder charge operated bolt-setting tool
DE10105886C2 (de) * 2001-02-09 2002-12-05 Hilti Ag Kolbenhalterung
DE10105882C2 (de) * 2001-02-09 2002-12-05 Hilti Ag Kolbenhalterung
DE10105885C1 (de) * 2001-02-09 2002-06-13 Hilti Ag Kolbenhalterung
DE10105880C2 (de) * 2001-02-09 2003-04-10 Hilti Ag Kolbenhalterung
DE10105884C2 (de) * 2001-02-09 2002-12-05 Hilti Ag Kolbenhalterung
DE10105879C2 (de) * 2001-02-09 2002-12-12 Hilti Ag Kolbenhalterung
JP4563812B2 (ja) * 2002-09-13 2010-10-13 ブラック アンド デッカー インク 回転工具
DE10254964B4 (de) * 2002-11-26 2014-02-13 Hilti Aktiengesellschaft Setzgerät
FR2848489B1 (fr) * 2002-12-11 2006-02-03 Prospection & Inventions Appareil de scellement a tir indirect
DE10259777B4 (de) * 2002-12-19 2016-06-30 Hilti Aktiengesellschaft Brennkraftbetriebenes Arbeitsgerät, insbesondere Setzgerät für Befestigungselemente
DE10358578A1 (de) * 2003-12-15 2005-07-14 Hilti Ag Brennkraftbetriebenes Setzgerät

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4310835A1 (de) 1993-04-02 1994-10-06 Bosch Gmbh Robert Bohr- und/oder Schlaghammer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2394793A1 (fr) * 2010-06-10 2011-12-14 HILTI Aktiengesellschaft Machine-outil manuelle dotée d'une sonnette pneumatique et son procédé de contrôle
EP2394794A1 (fr) * 2010-06-10 2011-12-14 HILTI Aktiengesellschaft Machine-outil manuelle dotée d'une sonnette pneumatique
US9044847B2 (en) 2010-06-10 2015-06-02 Hilti Aktiengesellschaft Power tool and control method
US9050713B2 (en) 2010-06-10 2015-06-09 Hilti Aktiengesellschaft Power tool

Also Published As

Publication number Publication date
EP1967328A3 (fr) 2008-09-24
US20080217039A1 (en) 2008-09-11
DE102007000135A1 (de) 2008-09-11

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