EP0246212A2 - Schutz gegen Vibrationen für ein motorangetriebenes, vibrationerzeugendes Handwerkszeug - Google Patents

Schutz gegen Vibrationen für ein motorangetriebenes, vibrationerzeugendes Handwerkszeug Download PDF

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Publication number
EP0246212A2
EP0246212A2 EP87850151A EP87850151A EP0246212A2 EP 0246212 A2 EP0246212 A2 EP 0246212A2 EP 87850151 A EP87850151 A EP 87850151A EP 87850151 A EP87850151 A EP 87850151A EP 0246212 A2 EP0246212 A2 EP 0246212A2
Authority
EP
European Patent Office
Prior art keywords
housing
arrangement
handle
resilient element
vibration
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Withdrawn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
EP87850151A
Other languages
English (en)
French (fr)
Other versions
EP0246212A3 (de
Inventor
Eskil Sundström
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0246212A2 publication Critical patent/EP0246212A2/de
Publication of EP0246212A3 publication Critical patent/EP0246212A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/006—Vibration damping means
    • 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 an arrangement for a power-­driven, vibrating hand equipment, to prevent injurious vibrations from being transmitted to the operator, the equipment comprising a tool designed to operate directly on a work area, a housing containing drive means for transmitting driving energy to the tool, a handle movably connected to the housing, to be gripped by one hand, and an anti-vibration means arranged between housing and handle, by means of which vibration between housing and handle is reduced.
  • the operator is here forced to guide the equipment by gripping the machine housing, which is an element sub­jected to considerable vibration and the risk of injury to the hand in contact with the machine housing is thus considerable.
  • the object of the invention is, in equipment of the type specified in the introduction, to provide an arrangement which with relatively simple means protects the operator from injurious vibrations when he is forced to guide the equipment by gripping the machine housing. This is achieved by arranging a protective element movable in relation to the housing of the drive means, to at least partially cover the housing, and connecting the pro­tective element to the antivibration means arranged between handle and housing, in a manner reducing vibration.
  • Such an arrangement enables an unprotected equipment or an equipment where only the handle is protected, to be re-constructed in a relatively simple manner.
  • the equipment shown in Figure 1 consists of a chisel hammer 1, comprising a handle 2, a chisel tool 3 and a machine housing 4, holding the drive means of the chisel tool 3.
  • Said drive means may comprise a piston operated by blast air, the blast air being supplied through a pipe 5.
  • the drive means itself is conventional and is not described further here, particularly since the antivibration arrangement is not limited to the application shown and can be used for many types of vibration-generating gear.
  • the upper part of the motor housing 4 is provided with radially projecting flanges 6 with guide holes 7, each lined with a flange bushing 47 of low-friction material, taking a control bolt 8.
  • the control bolt comprises a screw-tapped portion 10 which is screwed into a correspondingly tapped hole either directly in the handle 2 or in a connecting element 11 attached to the handle, and a head 9 on the lower side of the flanges 6.
  • a number of anti­vibration inserts 12 are arranged between the handle 2 and the upper side of the flanges 6, one insert for each bolt 8.
  • the inserts 12 are hollow, allowing the bolts 8 to pass through and abut the upper side of the flanges 6 and against the handle 2 or the connecting element 11 attached to the handle 2. The handle 2 is thus buffered with respect to the machine housing 4.
  • An upper sleeve 14 is arranged around the upper part of the machine housing 4, in order to protect the hand not holding the handle 2, but gripping the machine housing 4.
  • a lower sleeve 15 is removably joined to the upper sleeve 14, via a bayonet catch 16, for instance.
  • the lower sleeve 15 surrounds the lower part of the machine housing 4 and can be released from the upper sleeve 14 to allow access to a catch 17 for removing the chisel 3 from the upper part of the equipment 1.
  • the upper sleeve 14 is provided with a flange section 18 having a number of axial through-holes. The number of holes is the same as the number of bolts 8.
  • Each bolt head 9 is provided with a tapped hole into which a screw 13 with head is screwed, thus firmly securing the upper sleeve 14 to the bolts 8 and thus to the handle 2.
  • the sleeves 14 and 15 are thus protected from vibrations generating in the machine housing, via the antivibration elements 12 absorbing the vibrations transmitted from machine housing to handle 2.
  • the machine housing may be provided with an antivibration ring 20 which prevents the lower sleeve 15 from coming into direct contact with the machine housing 4.
  • the antivibration ring 20 is manufactured of a suitably absorbent material such as rubber, and a layer 19 of friction-reducing material such as polytetrafluorethylene, may suitably be arranged between ring 20 and lower sleeve 15, to prevent unnecessary friction between these parts.
  • Figures 3 and 4 show in more detail the sleeve arrangement used to isolate the machine housing 4.
  • Figure 3 is a view from above and Figure 4 a side view.
  • the flange 18 con­nected to the upper sleeve 14 is here in the form of two flanges 18a and 18b, flange 18b being provided with two attachment holes and flange 18a being provided with one hole.
  • the part 18 may equally well be an unbroken, peripheral flange, or it may be divided into several flanges, one for each bolt 8, for instance.
  • FIGS. 3 and 4 also show the bayonet catch used. Three catches are utilized here. They are of conventional type consisting of a dowel 21 attached to the upper sleeve 14 and co­operating with an angled slit 22 in the lower sleeve. Other equivalent means such as a screw joint may of course be used instead of the bayonet catch, the lower sleeve 15 being screwed onto the upper sleeve 14.
  • the invention is naturally not limited to the double-­sleeve embodiment shown here.
  • the lower sleeve 15 may be omitted and the single, upper sleeve 14 being allowed to extend to cover the machine housing 4.
  • the antivibration element need not necessarily be in the form of a sleeve totally surrounding the machine housing 4. For some applications it may be quite suf­ficient to use a support element which only partially covers the housing 4, such as the side of the housing the operator uses to align and support the equipment.
  • the antivibration member comprises a single element 23 arranged centrally between machine housing 4 and handle 2.
  • the antivibration element 23 consists here of a pneumatic ring comprising a cavity 24 which can be pressurized by a suitable medium, e.g. air, via a channel 26.
  • the channel 26 contains valve elements, not shown, ensuring that the medium remains in the cavity 24 or permits it to be withdrawn to lower the pressure.
  • the antivibration element 23 includes a central guide consisting of an inner guide ring 27 and an outer guide ring 28, the inner guide ring 27 being slidable inside the outer guide ring 28.
  • the antivibration element 23 is also provided with resilient walls 29, of rubber, for instance. Since the pressure in the cavity 24 of the element 23 can be altered, the ab­sorption properties can easily be adjusted to the existing requirements. Furthermore, arranging control centrally in the element 23, offers a compact arrangement which takes very little space, especially in radial direction. As in the embodiment shown in Figure 1, two sleeves 14, 15 are provided, each surrounding a part of the machine housing 4. However, the sleeve 14 is different from that in the first example and is here in direct contact with the handle 2.
  • the upper part of the upper sleeve 14 is therefore provided with a circular flange 30 facing radially inwards and clamped between the upper portion of the guide ring 27 and the handle 2. Screws 25 are used to secure the handle 2 in the inner guide ring 27, thus securing the flange 30 of the upper sleeve 14 between the inner guide ring 27 and the handle 2.
  • the upper sleeve 14 hangs down from the flange 30, close to the antivibration element 23, its lower part surrounding a part of the machine housing 4.
  • the lower sleeve 15 is then screwed onto the lower part of the upper sleeve 14.
  • the sleeve 14 may of course be similar to that in the first embodiment, and be secured to control bolts radially surrounding the central anti­vibration element 23. In this case, of course, the element 23 requires no central guide.
  • the upper sleeve 14 in the first embodiment may be similar to that described above and may be secured directly to the handle.
  • the upper sleeve 14 must then be adjusted to the rest of the arrangement and will be considerably larger in diameter than in the second embodiment, so that it can surround the bolts 8.
  • Figures 5 - 8 show an embodiment of an antivibration element particularly suitable for use in manual equip­ment to achieve the vibration protection described, since it absorbs not only vibrations in the axial direction of the equipment but also vibrations trans­verse to this direction.
  • the handle and the protective element at least partially surrounding the machine housing, are connected to the machine housing, the vibration from the housing thus being absorbed by these elements.
  • the unit 31 shown in Figures 5 and 6, comprises a first resilient element 32 of rubber, substantially in the form of a ring.
  • a hole 33 extends transversely through the resilient element 32, perpendicular to the cylinder axis.
  • Each end of the hole at the outer surface is provided with a sleeve 34 of low-friction material, such as polytetrafluorethylene. Thanks to the sleeves 34, the first resilient element 32 is slidable on a bolt 35 provided with a head, which acts as guide to the resilient element and prevents it from becoming deformed across its direction of spring action.
  • the tapped end 36 of the bolt 35 is screwed into a sliding block 37 which can move counter to two springs 38, trans­versely to the axial direction of the bolt 35, inside a casing 39.
  • the sliding block 37, casing 39 and two springs 38 form a second resilient element.
  • the casing 39 comprises two attachment flanges 40 provided with holes, with the aid of which the antivibration unit is secured.
  • An upper and a lower angular element 42 is vulcanized to the upper and lower side, respectively, of the first resilient element 32.
  • Each angular element 41, 42 is provided with a slot 43, 44 initiating in the vicinity of the free end of the angular element and extending axially towards the flange vulcanized to the rubber element 32.
  • the two angular elements 41, 42 can slide in relation to each other and are secured to each other across the sliding direction with the aid of a guide and attachment element 45 passing through the slots 43, 44.
  • This latter element comprises a dowel with two annular flanges suitably spaced.
  • the dowel is provided with a tapped central hole and one of the flanges is in one piece with the dowel while the other annular flange is screwed onto an external thread on the dowel and secured thereto.
  • a plate 46 of low-friction material such as polytetrafluorethylene is arranged on the dowel between the free flanges of the angular elements 41, 42.
  • the guide bolt 35 can be used to give the first re­silient element 32 suitable pre-stressing. The shorter the bolt length, the higher will be the pre-stressing.
  • the resilient element 32 may also be pre-stressed by having the slots 43, 44 start at a suitably selected distance from the edge of the free flanges.
  • An essential advantage of the antivibration unit 31 is that the spring action of the first resilient element 32 is independent of the direction of load.
  • the bolt 35 is primarily res­ponsible for the guidance, but this could also be taken care of by only the angular elements sliding against each other. If the control bolt 35 is omitted, the elements which are then responsible for guidance must of course be dimensioned accordingly.
  • the first re­silient element can then be secured to the second re­silient element by means of a tapped dowel projecting from the flange vulcanized to the lower angular element 42, said dowel being screwed into the sliding block 37.
  • U-shaped yoke ele­ments may be vulcanized to the upper and lower sides, respectively of the first resilient element 32.
  • Each yoke element comprises free shanks provided with slits, each extending along the first resilient element 32. The portion between the shanks is vulcanized to the first resilient element.
  • the free shanks of the lower yoke element are slidably secured to the free shanks of the upper yoke element by an attachment and guide element, in the same way as the free flanges of the angular elements 41, 42 are connected in the embodi­ment described earlier.
  • This antivibration unit is extremely suitable for use in manual equipment, particularly a power saw, but its field of application is also considerably wider. It can be used, for in­stance, to absorb vibrations in machine tools or as suspension element for the engines in vehicles.
EP87850151A 1986-05-12 1987-05-08 Schutz gegen Vibrationen für ein motorangetriebenes, vibrationerzeugendes Handwerkszeug Withdrawn EP0246212A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8602165 1986-05-12
SE8602165A SE460266B (sv) 1986-05-12 1986-05-12 Vibrationsskydd vid ett motordrivet vibrationsalstrande handredskap

Publications (2)

Publication Number Publication Date
EP0246212A2 true EP0246212A2 (de) 1987-11-19
EP0246212A3 EP0246212A3 (de) 1989-05-24

Family

ID=20364508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87850151A Withdrawn EP0246212A3 (de) 1986-05-12 1987-05-08 Schutz gegen Vibrationen für ein motorangetriebenes, vibrationerzeugendes Handwerkszeug

Country Status (2)

Country Link
EP (1) EP0246212A3 (de)
SE (1) SE460266B (de)

Cited By (6)

* 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
EP0680399A1 (de) * 1993-01-27 1995-11-08 Lord Corporation Schwingungabsorber für handvibrationsapparate
US5839517A (en) * 1993-01-27 1998-11-24 Lord Corporation Vibration isolator for hand-held vibrating devices
ES2200655A1 (es) * 2001-11-20 2004-03-01 Kaaz Corp Cosechador vibratorio para arboles frutales.
GB2429257A (en) * 2005-08-20 2007-02-21 Bryar Group Ltd An anti-vibration unit for a petrol impact wrench and an impact wrench incorporating such a unit
IT202100005933A1 (it) * 2021-03-12 2022-09-12 Cembre Spa Avvitatore ad impatto

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191220091A (en) * 1912-09-03 1913-09-03 George Lawson Robertson Improvements in Pneumatic Hammers.
US1667271A (en) * 1925-05-16 1928-04-24 Chicago Pneumatic Tool Co Handle attachment for drills
US1792894A (en) * 1928-04-03 1931-02-17 Chicago Pneumatic Tool Co Manually-supported power tool
US2109964A (en) * 1935-06-05 1938-03-01 Ingersoll Rand Co Regulating device for centrifugal compressors
DE1503193B1 (de) * 1964-08-13 1970-02-19 Erich Hahn Pressluftschlagwerkzeug
GB1462659A (en) * 1974-05-20 1977-01-26 Vni I Pk I Pneumatic hammers
FR2504440A1 (de) * 1981-04-28 1982-10-29 Permon Np
GB2098121A (en) * 1981-05-07 1982-11-17 Mo Vysshee Teknicheskoe Uchili Shock-absorbing pneumatic percussive tool
EP0207034A1 (de) * 1985-06-19 1986-12-30 Eskil Sundström Schwingungen absorbierender Griff

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2019964A (en) * 1933-02-20 1935-11-05 Independent Pneumatic Tool Co Cushion means for tools

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191220091A (en) * 1912-09-03 1913-09-03 George Lawson Robertson Improvements in Pneumatic Hammers.
US1667271A (en) * 1925-05-16 1928-04-24 Chicago Pneumatic Tool Co Handle attachment for drills
US1792894A (en) * 1928-04-03 1931-02-17 Chicago Pneumatic Tool Co Manually-supported power tool
US2109964A (en) * 1935-06-05 1938-03-01 Ingersoll Rand Co Regulating device for centrifugal compressors
DE1503193B1 (de) * 1964-08-13 1970-02-19 Erich Hahn Pressluftschlagwerkzeug
GB1462659A (en) * 1974-05-20 1977-01-26 Vni I Pk I Pneumatic hammers
FR2504440A1 (de) * 1981-04-28 1982-10-29 Permon Np
GB2098121A (en) * 1981-05-07 1982-11-17 Mo Vysshee Teknicheskoe Uchili Shock-absorbing pneumatic percussive tool
EP0207034A1 (de) * 1985-06-19 1986-12-30 Eskil Sundström Schwingungen absorbierender Griff

Cited By (9)

* 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
EP0680399A1 (de) * 1993-01-27 1995-11-08 Lord Corporation Schwingungabsorber für handvibrationsapparate
EP0680399A4 (de) * 1993-01-27 1996-01-10 Lord Corp Schwingungabsorber für handvibrationsapparate.
US5839517A (en) * 1993-01-27 1998-11-24 Lord Corporation Vibration isolator for hand-held vibrating devices
ES2200655A1 (es) * 2001-11-20 2004-03-01 Kaaz Corp Cosechador vibratorio para arboles frutales.
GB2429257A (en) * 2005-08-20 2007-02-21 Bryar Group Ltd An anti-vibration unit for a petrol impact wrench and an impact wrench incorporating such a unit
IT202100005933A1 (it) * 2021-03-12 2022-09-12 Cembre Spa Avvitatore ad impatto
EP4056326A1 (de) * 2021-03-12 2022-09-14 CEMBRE S.p.A. Schlagwerkzeug
WO2022190025A1 (en) * 2021-03-12 2022-09-15 Cembre S.P.A. Impact tool

Also Published As

Publication number Publication date
SE8602165L (sv) 1987-11-13
EP0246212A3 (de) 1989-05-24
SE8602165D0 (sv) 1986-05-13
SE460266B (sv) 1989-09-25

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