EP0294351A2 - Maschinen Handgriff mit Vibrationsdämpfung - Google Patents

Maschinen Handgriff mit Vibrationsdämpfung Download PDF

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Publication number
EP0294351A2
EP0294351A2 EP88850192A EP88850192A EP0294351A2 EP 0294351 A2 EP0294351 A2 EP 0294351A2 EP 88850192 A EP88850192 A EP 88850192A EP 88850192 A EP88850192 A EP 88850192A EP 0294351 A2 EP0294351 A2 EP 0294351A2
Authority
EP
European Patent Office
Prior art keywords
rubber
machine tool
grip
hand part
rubber body
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.)
Granted
Application number
EP88850192A
Other languages
English (en)
French (fr)
Other versions
EP0294351B1 (de
EP0294351A3 (en
Inventor
Jorgen Schou
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.)
Breakers AS
Original Assignee
WEJRA AS
WEJRA AS
Breakers AS
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 WEJRA AS, WEJRA AS, Breakers AS filed Critical WEJRA AS
Publication of EP0294351A2 publication Critical patent/EP0294351A2/de
Publication of EP0294351A3 publication Critical patent/EP0294351A3/en
Application granted granted Critical
Publication of EP0294351B1 publication Critical patent/EP0294351B1/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
    • B25D17/04—Handles; Handle mountings
    • B25D17/043—Handles resiliently mounted relative to the hammer housing

Definitions

  • the invention relates to a vibration dampened machine handle by which a machine tool such as a hydraulic hammer may be pressed in a direction towards a work place.
  • Machine tools such as hydraulically or pneumatically opera­ted drilling hammers, pneumatic drills, screw tools and angle sander-grinders transmit strong vibrations to the handle by which the operator presses them against the work place.
  • the action of these vibrations on the operator's hands may in the course of time result in permanent occupa­tional injuries, a phenomemon known under the name "white fingers”. Efforts are therefore made to develop machine handle devices with improved vibrational dampening.
  • a design is known wherein the grips are connected to the machine tool via an elastic, shock absorbing rubber bo­dy.
  • the grips extend transversely to the longitudinal axis of the machine tool and are connected to these rubber bo­dies at one end and are furthermore covered by foam rubber or another shock absorbing material.
  • the amplitude of the machine tool vibrations is largest in the direction of its longitudinal axis and due to the elastic intermediate piece and the reduction by lever action these vibrations are only transmitted to the grips with attenuated intensity.
  • the effectiveness of the vibrational dampe­ning depends substantially on the elasticity properties of the rubber bodies.
  • the vibrational dampening will be the better the softer the rubber bodies are.
  • the rubber bodies may not be made too soft since the grips are to be used for pressing the machine tool against the work place and therefore may not be too yiel­ ding.
  • the described design moreover has the drawback that the grips make a swinging movement about the ends where they are connected to the machine tool, in such a manner that their mutual angular position is changed when the ope­rator presses against the machine tool or lifts it by gra­sping the grips.
  • the latter has proved to be of comparatively great inconvenience in the use of hydrau­lic hammers since the operator gets the impression that the tool will not properly follow the movements when lifted from or pressed against the work place.
  • European published specification no. 0 156 387 describes a vibration dampened machine handle of the kind mentioned above and which as described in the introduction to claim 1 comprises a grip which is connected to an intermediate mem­ber via a first body made of rubber or similar material, said intermedate member being connected to the machine tool via a second body made of rubber or similar material.
  • the machine handle device according to the published speci­fication is furthermore provided with an "impact body” ar­ranged loosely within the grip, said "impact body” serving to counteract the vibrations of the grip by striking the inner walls thereof.
  • the design and the arrangement of the individual units in the machine handle according to the mentioned specification must moreover be chosen and dimen­sioned such that there occurs a nodal point in the area of the grip where the operator will most probably take hold.
  • the rubber bodies used to provide resiliency are according to the invention axially symmetrical and mounted in such a manner that their axes extend parallelly to each other in a plane which is transverse to the direction in which the ma­chine tool is pressed towards the work place.
  • the grip and the intermediate member are connected to the first rubber body in such a manner that they are turned relatively to each other about the axis of the first rubber body under torsional stress thereof when the machine tool is pressed towards the work place.
  • the intermediate member and the ma­chine tool are connected to the second rubber body in such a manner that they are turned relatively to each other about the axis of the second rubber body under torsional stress thereof when the machine tool is pressed towards the work place.
  • the grip comprises a substantially axially symmetrical hand part extending in parallel to the axes of the rubber bodies, said hand part being connected to the first rubber body via at least one transverse part, and the hand part is arranged in such a manner relative to the rubber bodies that a line extending from the axis of the hand part in the direction towards the work place in­tersects the plane, wherein the axes of the rubber bodies are situated, between said axes.
  • the hand part of the grip will generally extend transversely to the di­rection towards the work place, and it will not swing rela­tive to the machine tool but be displaced parallelly there­to by its swinging about the axes of the two rubber bodies due to the machine tool vibrations or due to a pressing or pulling action on the hand part, which displacement is moreover combined with a quite negligible rotation of the hand part about its own longitudinal axis.
  • the rotation is far less inconvenient than the pivoting move­ment of the hitherto known grips with a free end about the rubber body by which they are connected to the machine tool.
  • the design of the machine handle device disclosed in the claim furthermore implies that there is a comparatively long lever arm between the vibration source and the hand part of the handle device, as said path is folded twice about the pivotal joints formed by the rubber bodies.
  • the improvement of the purely kinematic characteristic of mo­tion of the machine handle device is thus accompanied by improvements in the dampening properties. Practical expe­rience moreover shows that in torsion rubber shows dampe­ning and resiliency properties which are highly adapted to the present purpose.
  • the embodiment of the invention disclosed in claim 5 dis­closes a simple design of a hand part which may be grasped with both hands.
  • Figs. 1 and 2 show a vibration dampened machine handle in an end view and a top view, respectively. In the drawing screws and other components for assembling individual units have been left out to facilitate the survey.
  • the main units of the machine handle are two axially sym­ metrical rubber springs 1 and 2 the axes of which extend parallelly to each other and with a grip 3 extending be­tween the rubber springs.
  • the device comprised by the rub­ber springs and the grip is secured to two retaining plates 4 which are connected to a machine tool which is not shown in detail.
  • Both rubber springs 1 and 2 consist of a cylinder shaped rubber body 5 which surrounds an axle 6 and which is sur­rounded by a cover 7.
  • the rubber body 5 is fixedly connec­ted to the axle 6 and the cover 7 so that it is torsion loaded when the axle 6 and the cover 7 are turned relative to each other about the axis of the rubber body.
  • the parts forming the second rubber spring 2 are shown by reference designators provided with an apostrophe.
  • the two rubber springs 1 and 2 are connected via an inter­mediate member which in the shown embodiment of the inven­tion consists of two connecting plates 8 and 9 that are welded to the opposite sides of the covers 7, 7′.
  • the axle 6 of the first rubber spring 1 is secured to the retaining plates 4 of the machi­ne tool which is provided with two inwardly bent supporting webs 10.
  • the second rubber spring 2 is connected to the grip 3 via two transverse mounting fittings 11 which extend transversely to the grip 3.
  • the axles 6, 6′ in the rubber springs 1 and 2 are formed with rectangular ends.
  • the machine handle shown in the drawings is used for pres­sing the machine tool (not shown) in a direction towards the work place. This is effected by pressing the grip 3 in the direction shown by an arrow indicated by the reference numeral 12 in Fig. 1.
  • the force action on the grip 3 causes the axle 6′ in the rubber spring 2 to turn a little in the direction indicated by the arrow 13, and the cover 7 of the rubber spring 1 turns a little in the direction indicated by the arrow 14.
  • the turning of the cover 7 in the direc­tion of the arrow 14 causes the centre in the rubber spring 2 to travel a distance on a circular path about the centre in the rubber spring 1.
  • the rubber spring 2 therefore ap­proaches the machine tool somewhat against the opposite torsion moment built up thereby in the rubber body.
  • the grip 3 describes a circular path about centre in the rubber spring 2 against the torsional moment thereby built up in the rubber body 5′, said moment operating oppo­site the turning as shown by reference numeral 13.
  • the movement made by the grip 3 is composed by two oppo­sitely directed circular arc shaped movements in such a manner that the grip will approximately move on a straight line. It is therefore a parallel displacement of the grip 3 in the direction 12. i.e. in the direction towards the work place.
  • the design of the machine handle shown in Figs. 1 and 2 therefore means that the angle between the longitudinal axis of the grip 3 and the machine tool is not changed when pressing the machine tool in a direction towards the work place. This implies a very pleasant handling of the machine tool since the operator may apply his full weight in the pressure without thereby having to change the angular po­sition of his wrists relative to the tool.
  • the torsional rigidity in the springs 1 and 2 is substan­ tially determined by the properties of the rubber body and may be freely fixed by the production thereof.
  • the dimen­sioning should be such that the grip 3 lies approximately halfway between the two connecting plates 8 and 9 when the machine tool is used. This produces a wide clearance of movement for the grip 3 in both directions.
  • Fig. 3 the machine handle is shown in a view in the di­rection indicated by III in Fig. 2. Some units have been left out in Fig. 3 to facilitate the survey and moreover various control means for starting and stopping the machine tool have been included.
  • the grip 3 is provided with a release pawl 16 which is pivotable about an axle 17.
  • the pawl 16 engages a release pawl 18 which is pivotably su­spended in a bearing 19 on the retaining plates 4 which are in connection with the machine tool.
  • the release pawl 18 exerts a pressure on a starting button 20 starting the ma­chine tool.
  • the vibrations of the machine tool are practically exclusively converted into vertically reciprocating parallel displacements of the grip 3.
  • the pawl 16 thus slides up and down the pawl 18 but at no time is there any risk that the machine tool will stop because of the fact that the release mechanism on the grip 3 moves relative to the machine tool during the work.
  • the hold on the lever 21 on the pawl 16 is released whereby the release botton 20 which is spring loaded in the direction shown by the arrow 22 will swing both the pawl 18 and the release handle 16 in a direction towards the disengaged position.
  • the design of the machine handle thus makes it possible to provide a very simple solution ot the problem of designing the actuator mechanism on a vibration dampened machine handle.
  • Figs. 4A and 4B show two alternative embodiments of vibra­tion dampened machine handles according to the invention.
  • it is the axles of the rubber springs which are interconnected instead of the covers in that the covers then serve as connecting units to the ma­chine tool and the grip, respectively.
  • the embodiment shown in Fig. 4B will particularly be advantageous in cases where the grip is designed to be gripped by one hand only.
  • the rubber springs 1 and 2 may either be designed with through-going axles or with an axle journal vulcanised into both ends.
  • the specific design shown in the drawings of the individual structural compo­nents of the machine handle is moreover merely to be under­stood as examples in that the individual parts will always have to be adapted to the constructional limits set by the machine tool in question.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP19880850192 1987-06-01 1988-05-31 Maschinen Handgriff mit Vibrationsdämpfung Expired - Lifetime EP0294351B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK2790/87 1987-06-01
DK279087A DK168471B1 (da) 1987-06-01 1987-06-01 Tohåndsbetjent, vibrationsdæmpet maskinhåndtag.

Publications (3)

Publication Number Publication Date
EP0294351A2 true EP0294351A2 (de) 1988-12-07
EP0294351A3 EP0294351A3 (en) 1990-04-25
EP0294351B1 EP0294351B1 (de) 1993-08-04

Family

ID=8115811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880850192 Expired - Lifetime EP0294351B1 (de) 1987-06-01 1988-05-31 Maschinen Handgriff mit Vibrationsdämpfung

Country Status (3)

Country Link
EP (1) EP0294351B1 (de)
DE (1) DE3882811T2 (de)
DK (1) DK168471B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237528A (en) * 1989-10-31 1991-05-08 Breakers As Vibration-damped hydraulic hammer
WO1993011912A1 (en) * 1991-12-07 1993-06-24 Thor Tools Limited Handle assembly
DE4327067A1 (de) * 1993-08-12 1995-02-16 Bayerische Motoren Werke Ag Montagevorrichtung für ein auf einen Flansch aufzusteckendes Dichtungsprofil
EP1166972A2 (de) * 2000-06-27 2002-01-02 Framatome Connectors International Auslöserverbindung für angetriebenes Werkzeug

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE454835A (de) * 1900-01-01
US2630784A (en) * 1949-06-20 1953-03-10 Lord Mfg Co Cushion handle for percussive tools
GB1071643A (en) * 1964-09-15 1967-06-07 Westinghouse Air Brake Co An improved handle frame assembly for a percussive tool
EP0156387A2 (de) * 1984-03-30 1985-10-02 Makoto Minamidate Schwingungsdämpfende Griffvorrichtung
EP0194347A1 (de) * 1984-12-24 1986-09-17 Wacker-Werke GmbH & Co. KG Gefederte Anbringung einer die Haltegriffe tragenden Schutzhaube an einem Schlagwerkzeug

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE454835A (de) * 1900-01-01
US2630784A (en) * 1949-06-20 1953-03-10 Lord Mfg Co Cushion handle for percussive tools
GB1071643A (en) * 1964-09-15 1967-06-07 Westinghouse Air Brake Co An improved handle frame assembly for a percussive tool
EP0156387A2 (de) * 1984-03-30 1985-10-02 Makoto Minamidate Schwingungsdämpfende Griffvorrichtung
EP0194347A1 (de) * 1984-12-24 1986-09-17 Wacker-Werke GmbH & Co. KG Gefederte Anbringung einer die Haltegriffe tragenden Schutzhaube an einem Schlagwerkzeug

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237528A (en) * 1989-10-31 1991-05-08 Breakers As Vibration-damped hydraulic hammer
WO1993011912A1 (en) * 1991-12-07 1993-06-24 Thor Tools Limited Handle assembly
DE4327067A1 (de) * 1993-08-12 1995-02-16 Bayerische Motoren Werke Ag Montagevorrichtung für ein auf einen Flansch aufzusteckendes Dichtungsprofil
EP1166972A2 (de) * 2000-06-27 2002-01-02 Framatome Connectors International Auslöserverbindung für angetriebenes Werkzeug
EP1166972A3 (de) * 2000-06-27 2004-01-21 Framatome Connectors International Auslöserverbindung für angetriebenes Werkzeug

Also Published As

Publication number Publication date
DK279087D0 (da) 1987-06-01
EP0294351B1 (de) 1993-08-04
DK168471B1 (da) 1994-04-05
EP0294351A3 (en) 1990-04-25
DE3882811T2 (de) 1994-04-14
DE3882811D1 (de) 1993-09-09
DK279087A (da) 1989-03-02

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