EP0884139B1 - Hydraulischer Schlaghammer - Google Patents

Hydraulischer Schlaghammer Download PDF

Info

Publication number
EP0884139B1
EP0884139B1 EP98110511A EP98110511A EP0884139B1 EP 0884139 B1 EP0884139 B1 EP 0884139B1 EP 98110511 A EP98110511 A EP 98110511A EP 98110511 A EP98110511 A EP 98110511A EP 0884139 B1 EP0884139 B1 EP 0884139B1
Authority
EP
European Patent Office
Prior art keywords
substance
hammer
casing
interspace
wall
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
EP98110511A
Other languages
English (en)
French (fr)
Other versions
EP0884139A3 (de
EP0884139A2 (de
Inventor
Nello Gazza
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.)
Socomec SA
Original Assignee
Socomec SA
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 Socomec SA filed Critical Socomec SA
Publication of EP0884139A2 publication Critical patent/EP0884139A2/de
Publication of EP0884139A3 publication Critical patent/EP0884139A3/de
Application granted granted Critical
Publication of EP0884139B1 publication Critical patent/EP0884139B1/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
    • B25D17/11—Arrangements of noise-damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/69—Foamed polymers, e.g. polyurethane foam

Definitions

  • the present invention relates to an oleohydraulic demolition hammer, i.e, a tool which is actuated by means of oil or other adapted pressurized fluid, which can be advantageously installed in machines such as excavators, without restrictions, to demolish rock or masonry even if made of reinforced concrete.
  • Prior art devices include demolition hammers provided with an outer casing in which recesses or hollows are internally provided in order to insert therein sheets of foamed materials such as cellular polyurethane meant to be crushed due to the forced insertion of the body of the hammer in order to reduce transmission of vibrations from said body to the casing, so as to decrease noise pollution.
  • Conventional hammers have, between said body and the outer casing, sheet-like elements made of elastomeric material which are interposed between said body and the outer casing, which is suitably thickened, in order to act as a guide for the axial oscillation of said body, reducing the transmission of vibrations and therefore noise pollution in this case as well.
  • CH 453252 discloses a demolition hammer having the above cited drawbacks.
  • the conventional devices are susceptible of numerous improvements in relation to the possibility of avoiding the above drawbacks.
  • the aim of the present invention is to solve the problem of drastically reducing the noise emission of the hammer, not only to avoid exceeding the allowed values but to actually advantageously drop below the limits prescribed by statutory provisions, further avoiding the early breaking of components which occurs in the current state of the art due to the extent of the vibrations: all this being achieved at a modest cost and without structural complications.
  • the above aim is achieved by adopting the insertion by pouring, into an interspace which is coaxial and external to the body of the hammer, of a noncellular polyurethane substance adapted to produce tension among the parts that are separated by said substance during the shrinkage that follows polymerization in an oven, thus eliminating or in any case drastically reducing the vibrations that are the source of noise emission.
  • the reference numeral 1 designates the body of the hammer, which is constituted in any manner and is assembled by means of braces whose axis is designated by 2.
  • the body is inserted between an upper circular shock-absorbing pad 3 and a lower ring 4, both of which are made of elastic material in order to cushion the stroke limit impacts of the tool 5.
  • the reference numeral 6 designates an upper flange of the casing 7 (optionally divided into multiple parts along its length) for coupling to the arm of an earth-moving machine or the like.
  • the reference numeral 8 designates a wear-resistant bottom plate of the casing 7.
  • the reference numeral 9 designates a guide made of elastomeric material or in any case of a material which is adapted to guide the axial oscillation of the body 1.
  • the reference numerals 10 and 11 respectively designate the outer wall and the inner wall of the casing 7, which have a different thicknesses.
  • the inner wall 11 is thicker, said walls being separated by an interspace 12 formed by two coaxial surfaces.
  • the interspace is filled by pouring by means of a noncellular polyurethane substance 13 ( Figure 1a), for example the one currently marketed by Uniroyal Chemical under the name Diprene LF Esters, advantageously having a Shore hardness between 65 and 95, depending on the increasing thicknesses of the casing, and meant to polymerize in an oven.
  • the reference numeral 14 designates the casing that encloses the interspace 15, which is part of a medium-to-low power hammer without braces.
  • the two coaxial surfaces between which the substance 13 is poured are constituted by the inner surfaces of the outer wall 10 and, respectively, of the inner wall 11, which are separated by the interspace 12 and constitute the casing 7.
  • the inner wall 11 of the casing 7 is thicker than the corresponding outer wall 10; the two walls are separated by the substance 13 along at least part of the interspace 12.
  • the two coaxial surfaces between which the substance 13 is poured are constituted by the inner surface of the wall constituted by the casing 14 which faces the outer surface of said body.
  • Preparation for drastic reduction in noise emission by the oleohydraulic demolition hammer occurs during a hot polymerization step (for example at a temperature of approximately 90°) due to the shrinkage of the substance used, which acts between the body of the hammer and the thinner outer casing, as in the case of Figure 2, in any case mutually tensioning two structures which have different vibration frequencies, so as to eliminate or greatly reduce vibrations, i.e., the source of the noise rather than just the transmission of said noise, as usually occurs.
  • the tension develops between the walls 10, 11 which have different thicknesses.
  • the substance 13 may be poured along the entire extension of the interspace 15 of Figure 2; vice versa, the substance 13 may be poured only along part of the extension of the interspace 12 of Figure 1.
  • the substance used may be different from the above cited polyurethane substance, so long as it is adapted to produce tension between the body 1 and the casing 14 and/or between the walls of the casing 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Saccharide Compounds (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Earth Drilling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Vibration Prevention Devices (AREA)
  • Building Environments (AREA)

Claims (7)

  1. Hydraulischer Schlaghammer mit einem Schlagkörper (1), einem äußeren Hammergehäuse und einer in einen Zwischenraum (12, 15) eingeführten Substanz (13), welche innerhalb des Gehäuses oder zwischen der inneren Oberfläche des Gehäuses und der äußeren Oberfläche des Schlagkörpers definiert wird, dadurch gekennzeichnet, dass die Substanz (13), welche so anpassungsfähig ist, um Spannung zwischen zwei gegenüber liegenden Oberflächen des Zwischenraumes (12, 15) zu erzeugen, durch Eingießen in den Zwischenraum eingeführt wird, welcher zwischen zwei koaxialen Oberflächen ausgebildet ist, der sich entlang der Länge des Schlaghammers erstreckt, um so ein Element für die wechselseitige Spannung der Wände auszubilden, zu denen die Oberflächen gehören.
  2. Schlaghammer nach Anspruch 1, dadurch gekennzeichnet, dass die Substanz (13) eine Polyurethansubstanz ist.
  3. Schlaghammer nach Anspruch 2, dadurch gekennzeichnet, dass die Polyurethansubstanz (13) in dem Zwischenraum (12, 15) des Schlaghammers heiß polymerisierbar ist.
  4. Schlaghammer nach Anspruch 3, dadurch gekennzeichnet, dass die heiß polymerisierbare Substanz (13) eine Härte zwischen 65 und 95 Shore aufweist.
  5. Schlaghammer nach Anspruch 1, dadurch gekennzeichnet, dass die zwei koaxialen Oberflächen, zwischen denen die Substanz (13) eingegossen wird, durch die Innenflächen der Außenwand (10) und respektive durch die der Innenwand (11) ausgebildet werden, welche durch den Zwischenraum (12) getrennt sind, und welche das Hammergehäuse (7) ausbilden.
  6. Schlaghammer nach Anspruch 5, dadurch gekennzeichnet dass die Innenwand (11) des Hammergehäuses (7) stärker als die korrespondierende Außenwand (10) ist; wobei die zwei Wände durch die Substanz (13) zumindest teilweise entlang des Zwischenraumes (12) getrennt sind.
  7. Schlaghammer nach Anspruch 1, dadurch gekennzeichnet, dass der Zwischenraum (12) zumindest teilweise durch die Substanz (13) belegt ist.
EP98110511A 1997-06-12 1998-06-09 Hydraulischer Schlaghammer Expired - Lifetime EP0884139B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97MO000109A IT1292747B1 (it) 1997-06-12 1997-06-12 Martello demolitore oleoidraulico
ITMO970109 1997-06-12

Publications (3)

Publication Number Publication Date
EP0884139A2 EP0884139A2 (de) 1998-12-16
EP0884139A3 EP0884139A3 (de) 1999-06-23
EP0884139B1 true EP0884139B1 (de) 2003-02-26

Family

ID=11386363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98110511A Expired - Lifetime EP0884139B1 (de) 1997-06-12 1998-06-09 Hydraulischer Schlaghammer

Country Status (5)

Country Link
EP (1) EP0884139B1 (de)
AT (1) ATE233152T1 (de)
DE (1) DE69811569T2 (de)
ES (1) ES2192719T3 (de)
IT (1) IT1292747B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7948008B2 (en) 2007-10-26 2011-05-24 Micron Technology, Inc. Floating body field-effect transistors, and methods of forming floating body field-effect transistors
US10344861B2 (en) 2015-04-24 2019-07-09 Caterpillar Inc. Hammer having composite piston sleeve

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1055048A (en) * 1964-10-19 1967-01-11 Atlas Copco Ab Improvements in noise deadening means for percussive tools
GB1254522A (en) * 1968-08-20 1971-11-24 Robert David Adams Devices used in vibratory or impact machines
CA2102708A1 (en) * 1991-05-09 1992-11-10 Dan T. Moore, Iii Method for producing a sound-dampened automotive enclosure and article produced thereby

Also Published As

Publication number Publication date
DE69811569T2 (de) 2003-09-04
ATE233152T1 (de) 2003-03-15
DE69811569D1 (de) 2003-04-03
ITMO970109A1 (it) 1997-09-12
ES2192719T3 (es) 2003-10-16
EP0884139A3 (de) 1999-06-23
IT1292747B1 (it) 1999-02-11
EP0884139A2 (de) 1998-12-16

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