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WO1993011911A1 - Appareil permettant de reduire la transmission de vibrations dans un outil portatif - Google Patents

Appareil permettant de reduire la transmission de vibrations dans un outil portatif Download PDF

Info

Publication number
WO1993011911A1
WO1993011911A1 PCT/US1992/010871 US9210871W WO9311911A1 WO 1993011911 A1 WO1993011911 A1 WO 1993011911A1 US 9210871 W US9210871 W US 9210871W WO 9311911 A1 WO9311911 A1 WO 9311911A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
balls
tool according
working
bed
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.)
Ceased
Application number
PCT/US1992/010871
Other languages
English (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
Priority claimed from GB9126979A external-priority patent/GB2262467A/en
Priority claimed from US07/899,522 external-priority patent/US5213167A/en
Application filed by Ingersoll Rand Co filed Critical Ingersoll Rand Co
Priority to US08/104,106 priority Critical patent/US5400860A/en
Priority to JP5511156A priority patent/JPH06507847A/ja
Priority to KR1019930702455A priority patent/KR100274746B1/ko
Priority to AU33227/93A priority patent/AU651269B2/en
Publication of WO1993011911A1 publication Critical patent/WO1993011911A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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 generally to an apparatus for reducing vibration transmission in a hand-held tool and more particularly relates to apparatus for reducing vibration transmission from a working portion of a hand-held tool to the user of the tool.
  • an apparatus for reducing vibration transmission from a working tool portion of a hand-held tool to the user of the tool comprising a floating, resilient ball arrangement interposed between a handle portion of the tool and the working portion of the tool 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.
  • the tool may be a percussive tool, such as a chipper, digger, needle gun, sealer, hammer drill or a demolition tool.
  • a percussive tool such as a chipper, digger, needle gun, sealer, 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 the working portion 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.
  • each ball can be located by pins or the like.
  • at least one and preferably 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 then to the action of the working part of the tool.
  • an apparatus for reducing vibration transmission from a working portion of a hand-held tool to a casing of the tool including a floating, resilient ball
  • This 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.
  • Figure 1 is a sectional view of part of a hand-held percussive tool showing apparatus for reducing vibration transmission from a working portion thereof to the user thereof, the tool being illustrated at mid-stroke;
  • Figure 2 is a sectional view taken oh the line II-II in Figure 1;
  • Figure 3 is an exploded perspective view of part of the apparatus and showing a modification;
  • Figure 4 is a sectional view of another part of the tool showing apparatus for reducing vibration transmission from the working portion to a casing of the tool, this view also being illustrated at mid-stroke;
  • Figure 5 is a section view taken on the line V-V in Figure 4.
  • Figure 6 is a sectional view to part of Figure 1 and showing a modification of that part;
  • Figure 7 is a view similar to part of Figure 4 and showing a modification of that part.
  • 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 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, while the bed 4 is attached to the working end portion 1 of the tool.
  • the apparatus as depicted in Figure 1 is carrying a mean static load.
  • the balls are located in their mean 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 center 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-center.
  • 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 12 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 ⁇ 0.16 inches (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.
  • FIG. 1 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 is 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 of 21 of polymer fitted around the portion 1 and a part-spherical, radiussed bearing tip 22 which can be 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)

Abstract

Un outil à percussion pneumatique comprend un appareil permettant de réduire la transmission de vibrations entre l'extrémité active (1) et la poignée (2), réduisant ainsi la transmission de vibrations à la main ou au bras de l'utilisateur. L'appareil comprend une partie mâle à tronc de cône (3) dont l'extrémité fait face à un logement femelle (4), la base de la partie en tronc de cône étant fixée à la poignée (2) et le logement (4) étant fixé à l'extrémité active (1). Trois boules de caoutchouc (5) sont coincées entre la partie en tronc de cône (3) et le logement (4) et sont placées dans leur position moyenne lorsqu'elles sont comprimées. Le mouvement oscillatoire du logement femelle parallèlement à l'axe longitudinal de la partie en tronc de cône a pour effet que les boules roulent sur les surfaces mâles et femelles et permet d'améliorer considérablement la constante de rappel ou la raideur. Est également décrit un appareil permettant de réduire la transmission de vibrations entre la partie active et un boîtier (12) de l'outil.
PCT/US1992/010871 1991-12-17 1992-12-15 Appareil permettant de reduire la transmission de vibrations dans un outil portatif Ceased WO1993011911A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US08/104,106 US5400860A (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
KR1019930702455A KR100274746B1 (ko) 1991-12-17 1992-12-15 손파지형 공구에서의 진동 전달 감소 장치
AU33227/93A AU651269B2 (en) 1991-12-17 1992-12-15 Apparatus for reducing vibration transmission in hand-held tool

Applications Claiming Priority (5)

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
GB9126979.5 1991-12-17
US07/899,522 US5213167A (en) 1992-06-16 1992-06-16 Apparatus for reducing vibration transmission in hand-held tool
US07/899,522 1992-06-16
EP92309846.1 1992-10-28

Publications (1)

Publication Number Publication Date
WO1993011911A1 true WO1993011911A1 (fr) 1993-06-24

Family

ID=26300039

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/010871 Ceased WO1993011911A1 (fr) 1991-12-17 1992-12-15 Appareil permettant de reduire la transmission de vibrations dans un outil portatif

Country Status (2)

Country Link
KR (1) KR100274746B1 (fr)
WO (1) WO1993011911A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1695798A1 (fr) * 2005-02-24 2006-08-30 Black & Decker, Inc. Assemblage de poignée pour outil à percussion

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2870770B1 (fr) * 2004-05-27 2006-08-11 Prospection Et D Inv S Techniq Appareil de fixation a gaz a carter de moteur thermique monte flottant a l'avant

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3525373A (en) * 1966-12-10 1970-08-25 Kyoritsu Noki Co Ltd Chain saw
US4074777A (en) * 1974-08-08 1978-02-21 Atlas Copco Aktiebolag Pneumatic impact tool
US4217677A (en) * 1978-03-13 1980-08-19 Kure Tekko Company Ltd. Apparatus for preventing transmission of vibration of a vibration machine
US4385665A (en) * 1979-10-23 1983-05-31 Fritz Knoll Kinetic energy absorber
US4401167A (en) * 1980-07-18 1983-08-30 Hitachi Koki Company, Limited Vibratory tool with a vibration proof mechanism for the handle thereof
US4936394A (en) * 1988-04-30 1990-06-26 Hitachi Koko Company, Limited Vibroisolating handle joint structure for power tool
US5054562A (en) * 1990-05-02 1991-10-08 Honsa Ergonomic Technologies, Inc. Vibration-isolated power tool

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3525373A (en) * 1966-12-10 1970-08-25 Kyoritsu Noki Co Ltd Chain saw
US4074777A (en) * 1974-08-08 1978-02-21 Atlas Copco Aktiebolag Pneumatic impact tool
US4217677A (en) * 1978-03-13 1980-08-19 Kure Tekko Company Ltd. Apparatus for preventing transmission of vibration of a vibration machine
US4385665A (en) * 1979-10-23 1983-05-31 Fritz Knoll Kinetic energy absorber
US4401167A (en) * 1980-07-18 1983-08-30 Hitachi Koki Company, Limited Vibratory tool with a vibration proof mechanism for the handle thereof
US4936394A (en) * 1988-04-30 1990-06-26 Hitachi Koko Company, Limited Vibroisolating handle joint structure for power tool
US5054562A (en) * 1990-05-02 1991-10-08 Honsa Ergonomic Technologies, Inc. Vibration-isolated power tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1695798A1 (fr) * 2005-02-24 2006-08-30 Black & Decker, Inc. Assemblage de poignée pour outil à percussion

Also Published As

Publication number Publication date
KR100274746B1 (ko) 2000-12-15
KR930703121A (ko) 1993-11-29

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