EP0551719B1 - Hand-held percussive tool incorporating apparatus for reducing vibration transmission to the user - Google Patents

Hand-held percussive tool incorporating apparatus for reducing vibration transmission to the user Download PDF

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Publication number
EP0551719B1
EP0551719B1 EP19920309846 EP92309846A EP0551719B1 EP 0551719 B1 EP0551719 B1 EP 0551719B1 EP 19920309846 EP19920309846 EP 19920309846 EP 92309846 A EP92309846 A EP 92309846A EP 0551719 B1 EP0551719 B1 EP 0551719B1
Authority
EP
European Patent Office
Prior art keywords
tool
tool according
balls
working
female
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 - Lifetime
Application number
EP19920309846
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0551719A1 (en
Inventor
Anthony Best
Stephen John Neads
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.)
Ingersoll Rand Co
Original Assignee
Ingersoll Rand Co
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 Ingersoll Rand Co filed Critical Ingersoll Rand Co
Priority to AU33227/93A priority Critical patent/AU651269B2/en
Priority to JP5511156A priority patent/JPH06507847A/ja
Priority to US08/104,106 priority patent/US5400860A/en
Priority to KR1019930702455A priority patent/KR100274746B1/ko
Publication of EP0551719A1 publication Critical patent/EP0551719A1/en
Application granted granted Critical
Publication of EP0551719B1 publication Critical patent/EP0551719B1/en
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
    • 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

Definitions

  • This invention relates to a hand-held percussive tool incorporating apparatus for reducing vibration transmission to the user of the tool.
  • EP-A-336 261 discloses means for vibro-isolation of connections of structural units of pneumatic hand tools, the means including elastic guiding means.
  • a hand-held percussive tool incorporating apparatus for reducing vibration transmission from a working tool portion of the tool to the user of the tool, the apparatus comprising first means interposed between a handle portion of the tool and the working tool portion and second means for reducing vibration transmission from the working tool portion to a casing of the tool, said second means being located adjacent the working tool portion and between the casing and the working tool portion, characterised in that said first means includes a floating, resilient ball arrangement.
  • the tool may be a percussive tool, such as a chipper, digger, needle gun, scaler, hammer drill or a demolition tool.
  • a percussive tool such as a chipper, digger, needle gun, scaler, hammer drill or a demolition tool.
  • the tool may be air operated.
  • the tool could also be electrically operated.
  • the resilient ball arrangement of the first means comprises balls, preferably three, which can be of rubber, located between a male part on one of the portions and a female part on the other of the portions.
  • the male part can be a substantially frustoconical part joined to the handle portion and the female part can be a female bed joined to a working part of the tool or vice versa , the bed facing the frustoconical portion with the balls lying compressed on the bed and the external surface of the frustocone.
  • the balls can be located by pins or the like.
  • each ball may be provided with a bore through which air under pressure can be transmitted from the frustoconical portion to the female bed and thence to the action of the working part of the tool.
  • the resilient ball arrangement of the second means can be in the form of a set of balls in a ring around the internal periphery of the casing and around the outer periphery of part of the working portion of the tool, thereby separating and isolating the two portions.
  • the set of balls can be linked together.
  • the balls can be located within shells which are curved to urge the balls towards their mean positions.
  • a D-handled, air-operated percussive tool which incorporates apparatus for reducing vibration transmission from a working end portion 1 to a hand grip 2, thereby to reduce vibration transmission to the hand/arm of the user.
  • apparatus for reducing vibration transmission from a working end portion 1 to a hand grip 2, thereby to reduce vibration transmission to the hand/arm of the user.
  • Such apparatus will be briefly referred to hereafter as the "vibration isolator”.
  • the vibration isolator in the form illustrated comprises a male, substantially frustoconical portion 3 whose tip is located facing a female bed 4.
  • the base of the frustoconical part is attached to the handle grip 2, whilst the bed 4 is attached to the working end portion 1 of the tool.
  • Three substantially spherical rubber balls 5 are trapped between the portion 3 and bed 4, which is preferably of scalloped form, the number of scallops corresponding to the number of balls and each scallop serving to receive and locate its ball.
  • the apparatus as depicted in Figure 1 is carrying a mean static load.
  • the balls can be located in their mean positions under compression by means of nylon tubes 6A and 6B located in bores 7 of the balls 5, the tubes having portions protruding from the surfaces of the balls so that these protruding portions are located in corresponding bores 8A and 8B in the portion 3 and bed 4, respectively.
  • the tubes 6A and 6B in each bore 7 are spaced apart to give sufficient clearance for compression and expansion movement of the ball 5 in which the bore is located.
  • the tubes 6A, 6B may be nylon inserts which are glued, bonded or simply press fits.
  • the bores can form an integral part of the compressed air supply to the working end portion of the tool from an air supply conduit 9 in the handle grip 2, into a conduit 9A passing down the centre of the tapered portion 3 and communicating with the bores 8A, 7 and 8B.
  • the bores 8B lead on to a cycle valve illustrated generally at 10.
  • the portion 3 need not be pure frustoconical but can be given a gently curving taper and/or can incorporate an angular change in the direction of taper.
  • the tubes 6A and 6B serve to locate the balls 5 on the taper, especially when the parts 1 and 2 are driven off-centre.
  • the tubes 6A, 6B simply serve as locating means.
  • the modification shown in Figure 3 takes the form of three radially-extending wings 11 on the portion 3 which run in slots 4A parallel to the longitudinal axis of the tool. These wings also act as anti-rotation means if the rotational stiffness of the balls is overcome, thereby acting as a travel limiter. Also, they act as a rebound stop or travel limiter in the axial direction.
  • the percussive tool will oscillate at around ⁇ 4mm at 25 Hz/sec.
  • the acceleration levels experienced with the balls is very high and so the resilient material of the balls must be of a suitable hardness.
  • the apparatus provides a high radial stiffness and a low (soft) axial stiffness with rising rate. In comparison, a normal coil spring would have a constant rate.
  • the balls effectively provide a rising spring rate or stiffness. The rising rate can be varied by varying the degree of slope on the rolling surfaces.
  • the axial stiffness is intended to be lower, and with a constant rate, but the radial stiffness is intended to be higher than is the case with the vibrator isolator at the hand grip end of the tool.
  • the shells 15 and 16 are curved to urge the bracelet of balls towards their mean positions. The balls are compressed and in this case, they have a shallow curve.
  • Figure 6 shows a possible modification of the construction shown in Figures 1 to 3, in which the air line is not via the balls 5 but via a separate, flexible hose 18 connected between the hand grip 2 and the reciprocating portion 1. There are still three balls 5, each located in its own scalloped portion on the bed 4.
  • the male portion 3 can be provided with planar or substantially planar faces.
  • the reciprocating portion 1 is guided by three toughened pins 19 extending from the hand grip 2 parallel to the axis of the tool, each pin running as a loose fit in its own hardened bush 20. This construction provides guiding and anti-rotation means for the portion 1.
  • Figure 7 shows a possible modification of the construction shown in Figures 4 and 5, in which the bracelet of balls at the actual tool 14 end is replaced by a plain sliding bearing.
  • This comprises a bed 21 of polymer fitted around the portion 1 and a part-spherical, radiussed bearing tip 22 which can be of hardened steel flash chromium plated.
  • a slight clearance is provided to allow for "blow past", which provides self-cleaning and allows for expansion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
  • Auxiliary Devices For Music (AREA)
EP19920309846 1991-12-17 1992-10-28 Hand-held percussive tool incorporating apparatus for reducing vibration transmission to the user Expired - Lifetime EP0551719B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU33227/93A AU651269B2 (en) 1991-12-17 1992-12-15 Apparatus for reducing vibration transmission in hand-held tool
JP5511156A JPH06507847A (ja) 1991-12-17 1992-12-15 手持ち工具における振動伝達を低減する装置
US08/104,106 US5400860A (en) 1991-12-17 1992-12-15 Apparatus for reducing vibration transmission in hand-held tool
KR1019930702455A KR100274746B1 (ko) 1991-12-17 1992-12-15 손파지형 공구에서의 진동 전달 감소 장치

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9126979A GB2262467A (en) 1991-12-17 1991-12-17 Apparatus for reducing vibration transmission in hand-held tool
GB9126979 1991-12-17

Publications (2)

Publication Number Publication Date
EP0551719A1 EP0551719A1 (en) 1993-07-21
EP0551719B1 true EP0551719B1 (en) 1996-11-27

Family

ID=10706538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920309846 Expired - Lifetime EP0551719B1 (en) 1991-12-17 1992-10-28 Hand-held percussive tool incorporating apparatus for reducing vibration transmission to the user

Country Status (5)

Country Link
EP (1) EP0551719B1 (OSRAM)
DE (1) DE69215494T2 (OSRAM)
ES (1) ES2094884T3 (OSRAM)
GB (1) GB2262467A (OSRAM)
TW (1) TW224436B (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1961135B (zh) * 2004-04-30 2010-06-23 安斯波成就公司 外科手术气动马达

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2285763B (en) * 1994-01-11 1997-06-11 Ingersoll Rand Co Fluid metering device for compressed fluid operated tool
KR100260309B1 (ko) * 1997-06-11 2000-07-01 최해성 유압헤머
GB2431610A (en) * 2006-03-03 2007-05-02 Black & Decker Inc Handle Damping System
DE102009002589A1 (de) * 2009-04-23 2010-10-28 Hilti Aktiengesellschaft Handwerkzeugmaschine
EP3335838A1 (de) * 2016-12-15 2018-06-20 HILTI Aktiengesellschaft Handwerkzeugmaschine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB453213A (en) * 1934-11-29 1935-06-08 Jacques D Albay Improvements in resilient connections and joints
NL41026C (OSRAM) * 1936-02-21
US2440150A (en) * 1945-01-31 1948-04-20 Independent Pneumatic Tool Co Compression member
US2468901A (en) * 1945-10-20 1949-05-03 Gen Tire & Rubber Co Cushioning and virration damping support
GB721636A (en) * 1951-09-21 1955-01-12 Giulio Virgilio Scanzi Improvements relating to shock-absorbers for vehicles
BE527846A (OSRAM) * 1953-06-19
CS149009B1 (OSRAM) * 1971-02-01 1973-05-24
SE8107226L (sv) * 1981-01-28 1982-07-29 Byggergonomilaboratoriet Hb Vibrationsdempande anordning
GB8516839D0 (en) * 1985-07-03 1985-08-07 Isolated Systems Ltd Anti-vibration mount
CH669142A5 (de) * 1986-04-04 1989-02-28 Sig Schweiz Industrieges Presslufthammer.
PL153240B1 (en) * 1988-03-29 1991-03-29 Politechnika Poznanska Vibration damping arrangement for hand tools

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1961135B (zh) * 2004-04-30 2010-06-23 安斯波成就公司 外科手术气动马达

Also Published As

Publication number Publication date
GB2262467A (en) 1993-06-23
EP0551719A1 (en) 1993-07-21
GB9126979D0 (en) 1992-02-19
TW224436B (OSRAM) 1994-06-01
ES2094884T3 (es) 1997-02-01
DE69215494T2 (de) 1997-05-22
DE69215494D1 (de) 1997-01-09

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