EP0152376B1 - Appareil à percussion - Google Patents

Appareil à percussion Download PDF

Info

Publication number
EP0152376B1
EP0152376B1 EP85810037A EP85810037A EP0152376B1 EP 0152376 B1 EP0152376 B1 EP 0152376B1 EP 85810037 A EP85810037 A EP 85810037A EP 85810037 A EP85810037 A EP 85810037A EP 0152376 B1 EP0152376 B1 EP 0152376B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
housing
percussion
anvil
tool
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
Application number
EP85810037A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0152376A1 (fr
Inventor
Paul Dummermuth
Jean-Pierre Budlinger
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.)
Von Arx AG
Original Assignee
Von Arx 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 Von Arx AG filed Critical Von Arx AG
Priority to AT85810037T priority Critical patent/ATE35101T1/de
Publication of EP0152376A1 publication Critical patent/EP0152376A1/fr
Application granted granted Critical
Publication of EP0152376B1 publication Critical patent/EP0152376B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/04—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously of the hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member
    • 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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/11—Arrangements of noise-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
    • B25D17/24—Damping the reaction force
    • 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
    • B25D2250/275—Tools having at least two similar components
    • B25D2250/285—Tools having three or more similar components, e.g. three motors
    • B25D2250/291—Tools having three or more parallel bits, e.g. needle guns
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/45—Scale remover or preventor
    • Y10T29/4572—Mechanically powered operator
    • Y10T29/4578—Tack or needle type

Definitions

  • the present invention relates to a percussion device comprising an elongated casing at the front end of which a bundle of metal needles protrudes axially, a needle holder mounted longitudinally sliding inside this casing, a spring for elastically pressing this needle holder against an anvil, a cylinder mounted longitudinally sliding inside said casing and the front end of which serves as a rear stop for this anvil and is open to allow an axially free piston mounted in this cylinder and playing the role percussion member, motor means for initiating and maintaining a series of percussion at a given frequency of said percussion member against said anvil and an elastic compression element disposed between the respective rear ends of this casing and of this cylinder.
  • Such devices are used for the stripping of surfaces and for this purpose comprise a bundle of metal needles such as the device described in US-A-4,134,193.
  • This invention also relates to another percussion device having an elongated casing at the front end of which a tool holder receives a tool which projects axially and is mounted longitudinally sliding in this tool holder, this casing containing a cylinder mounted longitudinally sliding inside said casing and the front end of which is adjacent to the tool holder and is open to allow an axially free piston mounted in this cylinder to pass and acting as a tool percussion member, motor means to initiate and maintain a series of percussions at a given frequency of said percussion member against said tool and two elastic compression elements arranged at the two respective ends of this casing by exerting their opposing forces on the cylinder.
  • percussion device is a device without anvil or free piston, but with two coaxial pistons pressed against each other by two springs and spreading one of the 'other then approaching alternately under the effect of a pneumatic motor mechanism.
  • Such a device is relatively silent, but is limited to low powers and its performance with respect to the flow of compressed air consumed is quite poor. Given their low power, these devices cannot be used for work such as pickling rusty sheets or attacking concrete surfaces.
  • the object of the present invention is precisely to provide a solution which makes it possible to effectively reduce the vibrations transmitted to the casing in this type of device, while retaining in particular the convenience of the supply of lateral compressed air by the handle.
  • the subject of the present invention is a percussion device of the aforementioned type as defined by claims 1 and 2.
  • the advantage of this device lies in a considerable damping of vibrations.
  • the measures taken to increase this depreciation do not involve costly modifications of the device, nor complications in terms of construction or use.
  • the solution object of this invention practically does not interfere with the motor mechanism and therefore does not reduce the initial useful power of the device, contrary to what has been proposed in the case of devices in which the tool is integral with a reciprocating piston.
  • Fig. 1 is a sectional elevation view of this first embodiment.
  • Fig. 2 is a similar view of the second embodiment.
  • Fig. 3 is a sectional view along line III-III of FIG. 2.
  • Fig. 4 is a partial sectional view of a variant of FIG. 1.
  • Fig. 5 is a detail view greatly enlarged along the circle in phantom line V of FIG. 1.
  • Figs 6 and 7 are two acceleration diagrams.
  • the apparatus illustrated in fig. 1 comprises a cylinder 1, the front end of which is open and the rear end of which is closed by a plug 2 held in place by an elastic ring 3
  • This cylinder 1 has two compartments 4 and 5.
  • a light 8 places the compartment 4 of the cylinder 1 in communication with an annular space 9 formed between the cylinder 1 and a casing 10 in which this cylinder is mounted axially sliding.
  • This annular space is sealed by two annular seals 11 arranged in the cylinder 1 on either side of this annular space 9.
  • Another light 12 passes through the wall of the casing 10 and serves to make the annular space 9 communicate with a supply duct 13 passing longitudinally through a handle 14 fixed laterally to the casing 10 and giving the device the appearance of a gun.
  • This supply duct 1.3 is intended to be connected to a source of compressed air (not shown).
  • a lever 15 articulated around a transverse axis 16 to the handle 14 is used to control the opening and closing of a valve 17 controlling the supply conduit 13.
  • the open front end of the cylinder 1 is in contact with an anvil 18 against the front face of which a tool holder 19 is pressed by a spring 20 which bears against a narrowing 10a of the diameter of the casing 10.
  • the tool holder 19 carries a bundle of needles 21 of which only one needle is shown, intended for the etching of surfaces.
  • the needles 21 are freely mounted through the tool holder 19 and have a head 21a intended to come into contact with the front face of the anvil 18 when the tool is applied against a surface to be worked.
  • the rear end of the cylinder 1 is biased by a spring 22 compressed between this cylinder and the rear end of the casing 10.
  • the diameter of the cylinder 1 is dimensioned so as to fit in this casing with sufficient clearance so that there is no contact between this cylinder and the casing.
  • the clearance is 0.2 mm over the diameter.
  • the guiding of the cylinder 1 and its suspension in the casing 10 are ensured by the seals 11, which are elastic annular bearings, and therefore serve two purposes.
  • these seals have a Z-shaped section so as to make the suspension of the cylinder sufficiently elastic and to absorb as much as possible the vibrations transmitted to the casing 10.
  • FIG. 5 A partial view in very enlarged section of the detail of the elastic suspension of the cylinder 1 in the casing 10 is illustrated in FIG. 5.
  • the casing 10 and the cylinder 1 are separated from each other, the internal surface of the casing 10 does not need to be treated by cementation, which constitutes a saving in manufacturing cost.
  • the proposed solution lends itself particularly well to the lateral supply of compressed air which constitutes the least costly solution.Also and unlike the axial supply, the cylinder 1 and the supply line 13 have no mechanical connection so that the cylinder cannot be subjected to stresses making an angle with the longitudinal axis of the apparatus as this occurs with the axial supply when the supply line feed is off center.
  • the needle holder 19 is preferably made of plastic as described in US-A-4,134,193, while the surface of the anvil 18 in contact with the casing 10 is also preferably made of plastic as described in Swiss Patent CH-A-654,513 published after the filing date of the present invention. Therefore, the housing 10 is not in contact with any metal part of the percussion mechanism.
  • the front end of the needles 21 is applied against the surface to be worked, so that their heads 2la come into contact with the front face of the anvil 18.
  • the spring 22 is more or less compressed.
  • compartment 4 In this position, the rear part of compartment 4 is no longer in contact with the pressurized air supply, but with compartment 5 open towards the front so that the pressurized air being in the rear part from compartment 4 escapes.
  • compartment 4 constituted by an annular space formed around the small diameter front section 6a of the free piston 6 remains in contact with the source of air under pressure, the pressure rises in this annular space and bring it back piston 6 back, after which the cycle begins again.
  • the presence of the spring 22 does not in any way interfere with the operation of the free piston engine mechanism.
  • This spring 22 is compressed as a function of the pressure exerted to apply the needles 21 against the surface to be worked.
  • the vibrations due to the impact of the free piston 6 against the anvil 18 and that of the needles 21 against the working surface are absorbed by the springs 20 and 22 between which the entire mechanism is mounted in the casing 10.
  • the absence of any rigid connection between the striking mechanism and the casing 10 has the effect that these vibrations are practically not transmitted to this casing and to the handle 14, thus considerably reducing the fatigue of the user, without significantly reducing the device performance.
  • This improvement does not, moreover, lead to a noticeable increase in the cost price since it requires only an additional spring, the presence of which has no effect on the cost of assembly, compensated by the fact that the inside of the casing 10 must not be case-hardened.
  • FIG. 2 relates to a device with a single tool consisting of a chisel 23 and a percussion mechanism identical to that of FIG. 1 and which, therefore, will not be described.
  • the chisel 23 is directly in contact with the free piston 6.
  • the rear part of square section is slidably mounted in a tool holder 24 fixed to the front end of the cylinder 1 and the chisel is held in place by a cap. 25 hooked at the front end of the tool holder 24 and to a flange 23a formed on this chisel 23.
  • the tool holder 24 still has two openings 26 for the exhaust of air leaving the cylinder 1.
  • the front end of the spring 20 presses against a ring 27 integral with the casing 10.
  • FIG. 4 shows an apparatus whose casing 10 is surrounded over a part of its length by a tubular element 30.
  • An acoustic absorbent material such as a plastic foam 31, in particular a polyurethane foam, fills the space between these tubular elements and is in contact with the inside of the casing 10 through openings 32.
  • This acoustic insulating casing makes it possible to dampen the parasitic vibrations which could remain in the area of the anvil 18 and of the needle holder 19. Such vibrations result from non-longitudinal components generated following the striking action of the free piston 6 on the anvil 18.
  • Such an acoustic insulating tubular element therefore completes the action of the shock-absorbing springs and of the suspension of the cylinder 1, further reduces the level residual vibrations and reduces the effect of the noise generated by the repeated impact of the free piston 6 on the anvil 18.
  • FIGS. 6 and 7 show two diagrams of the accelerations, measured in the band from 3 Hz to 1000 Hz on the device which is the subject of the invention, respectively on an identical device but devoid of elastic suspensions.
  • the increase in surface temperature was also measured at the fingertips after use of the device. It is 3-4 ° C for the three comparison devices and 2 ° C for the device according to the invention.
  • Another test carried out is the increase in the reflex time of the biceps after work, while this increase is 3 ms in the case of the device according to the invention, it is from 8 to 13 ms for the three devices. for comparison.
  • annular suspension seals 11 with an annular Z-shaped straight section has proved to be extremely important insofar as it makes it possible to produce an effective seal and a suspension which is sufficiently elastic to absorb vibrations. Indeed, the replacement of these seals by 0-rings with a full circular section has made it possible to note an already significant reduction in the vibration damping effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Saccharide Compounds (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP85810037A 1984-02-09 1985-02-04 Appareil à percussion Expired EP0152376B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85810037T ATE35101T1 (de) 1984-02-09 1985-02-04 Schlaggeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH605/84 1984-02-09
CH60584A CH655682B (enrdf_load_stackoverflow) 1984-02-09 1984-02-09

Publications (2)

Publication Number Publication Date
EP0152376A1 EP0152376A1 (fr) 1985-08-21
EP0152376B1 true EP0152376B1 (fr) 1988-06-15

Family

ID=4190862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810037A Expired EP0152376B1 (fr) 1984-02-09 1985-02-04 Appareil à percussion

Country Status (12)

Country Link
US (1) US4723610A (enrdf_load_stackoverflow)
EP (1) EP0152376B1 (enrdf_load_stackoverflow)
JP (1) JPS60180784A (enrdf_load_stackoverflow)
AT (1) ATE35101T1 (enrdf_load_stackoverflow)
AU (1) AU3853585A (enrdf_load_stackoverflow)
CA (1) CA1275601C (enrdf_load_stackoverflow)
CH (1) CH655682B (enrdf_load_stackoverflow)
DE (1) DE3563319D1 (enrdf_load_stackoverflow)
DK (1) DK55485A (enrdf_load_stackoverflow)
FI (1) FI80840C (enrdf_load_stackoverflow)
NO (1) NO159478C (enrdf_load_stackoverflow)
ZA (1) ZA85948B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7473432B2 (en) 2002-10-11 2009-01-06 Idea Ag NSAID formulations, based on highly adaptable aggregates, for improved transport through barriers and topical drug delivery
US7861798B2 (en) 2004-08-26 2011-01-04 Von Arx Ag Needle gun

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5325929A (en) * 1991-07-09 1994-07-05 Bretec Oy Hydraulic impact hammer
US5251367A (en) * 1991-08-21 1993-10-12 Equipment Development Company, Inc. Pneumatically driven descaling tools
SE469549B (sv) * 1991-11-04 1993-07-26 Atlas Copco Tools Ab Vibrationsdaempande organ foer ett handhaallet verktyg
US5259462A (en) * 1992-08-28 1993-11-09 Ingersoll-Rand Company Soft mount air distributor
US5588323A (en) * 1995-05-22 1996-12-31 U.S. Industrial Tool And Supply Hand-held rivet bucking tool using energy dissipative polymer
US5626199A (en) * 1995-07-05 1997-05-06 T.C. Service Company Pneumatic impact tool having improved vibration and noise attenuation
US5573075A (en) * 1995-07-05 1996-11-12 T.C. Service Company Pneumatic impact tool having improved vibration and noise attenuation
SE508812C2 (sv) * 1996-03-14 1998-11-09 Goeran Nilsson Tryckmediumdriven slagmekanism
US5813477A (en) * 1996-05-23 1998-09-29 Chicago Pneumatic Tool Company Vibration-reduced impact tool and vibration isolator therefor
US6622802B2 (en) 2001-03-29 2003-09-23 Intel Corporation Fastener installation tool and methods of use
US7013986B2 (en) * 2003-05-12 2006-03-21 Nitto Kohki Co., Ltd. Impact tool
JP4494042B2 (ja) * 2004-03-02 2010-06-30 株式会社テクノサカト ブレーカー
SE528469C2 (sv) * 2004-07-05 2006-11-21 Atlas Copco Constr Tools Ab Slående verktyg med en rörligt upphängd slagmekanism
SE528471C2 (sv) * 2004-07-05 2006-11-21 Atlas Copco Constr Tools Ab Vibrationsdämpat slående verktyg med tryckluftmatningsorgan
TWM296773U (en) * 2006-03-31 2006-09-01 Shuen Tai Prec Entpr Co Ltd Portable power drill with shock absorption protective sheath
US7806201B2 (en) * 2007-07-24 2010-10-05 Makita Corporation Power tool with dynamic vibration damping
US8240394B2 (en) * 2008-12-09 2012-08-14 Sp Air Kabushiki Kaisha Hammer with vibration reduction mechanism
CN102776860A (zh) * 2012-08-14 2012-11-14 韶关学院 气动冲击式破冰机
US20160271778A1 (en) * 2015-03-21 2016-09-22 Chih Kuan Hsieh Fixing Structure for Cylinder
EP4349534A3 (en) * 2018-01-26 2024-07-17 Milwaukee Electric Tool Corporation Percussion tool
US11628550B2 (en) 2020-02-07 2023-04-18 Storm Pneumatic Tool Co., Ltd. Vibration reducing structure of pneumatic hammer
TWI778908B (zh) * 2022-01-21 2022-09-21 大里興業股份有限公司 具有改良減振結構之氣動衝擊工具

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FR1154429A (fr) * 1956-01-19 1958-04-10 Perfectionnement aux outils à moteur
US4134193A (en) * 1976-06-30 1979-01-16 Von Arx Ag Maschinenfabrik Surface-cleansing tool

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US2392182A (en) * 1943-06-19 1946-01-01 Crane Packing Co Piston construction
US2638749A (en) * 1951-01-19 1953-05-19 Henry J Clay Electropneumatic hammering device
FR1059349A (fr) * 1951-09-07 1954-03-24 Marteau pneumatique
US3094900A (en) * 1956-12-27 1963-06-25 Fastener Corp Fastener driving apparatus
CH379433A (de) * 1960-08-18 1964-06-30 Wirz Friedrich Pressluftwerkzeug, insbesondere Pressluft-Abbauhammer
US3032998A (en) * 1961-05-05 1962-05-08 Black & Decker Mfg Co Ram catcher for piston-ram assembly
FR1348165A (fr) * 1963-02-15 1964-01-04 Outil à percussion
US3496840A (en) * 1968-01-29 1970-02-24 Fastener Corp Fastener driving apparatus
US3680643A (en) * 1969-03-01 1972-08-01 Nitto Kohki Co Fluid actuated tool having removable coil spring biasing means
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CS149009B1 (enrdf_load_stackoverflow) * 1971-02-01 1973-05-24
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JPS5867670U (ja) * 1981-10-30 1983-05-09 日東技研株式会社 衝撃工具
CH654513A5 (fr) * 1983-11-04 1986-02-28 Arx Ag Appareil a percussion.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1154429A (fr) * 1956-01-19 1958-04-10 Perfectionnement aux outils à moteur
US4134193A (en) * 1976-06-30 1979-01-16 Von Arx Ag Maschinenfabrik Surface-cleansing tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7473432B2 (en) 2002-10-11 2009-01-06 Idea Ag NSAID formulations, based on highly adaptable aggregates, for improved transport through barriers and topical drug delivery
US7861798B2 (en) 2004-08-26 2011-01-04 Von Arx Ag Needle gun

Also Published As

Publication number Publication date
CA1275601C (en) 1990-10-30
NO159478B (no) 1988-09-26
DE3563319D1 (en) 1988-07-21
AU3853585A (en) 1985-08-15
FI850547L (fi) 1985-08-10
ZA85948B (en) 1985-09-25
NO159478C (no) 1989-01-04
NO850479L (no) 1985-08-12
ATE35101T1 (de) 1988-07-15
CH655682B (enrdf_load_stackoverflow) 1986-05-15
DK55485D0 (da) 1985-02-07
EP0152376A1 (fr) 1985-08-21
DK55485A (da) 1985-08-10
FI80840B (fi) 1990-04-30
FI80840C (fi) 1990-08-10
US4723610A (en) 1988-02-09
JPS60180784A (ja) 1985-09-14
FI850547A0 (fi) 1985-02-08

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