EP0055244B1 - Schlagendes, handgehaltenes Druckluftwerkzeug - Google Patents

Schlagendes, handgehaltenes Druckluftwerkzeug Download PDF

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Publication number
EP0055244B1
EP0055244B1 EP19810890197 EP81890197A EP0055244B1 EP 0055244 B1 EP0055244 B1 EP 0055244B1 EP 19810890197 EP19810890197 EP 19810890197 EP 81890197 A EP81890197 A EP 81890197A EP 0055244 B1 EP0055244 B1 EP 0055244B1
Authority
EP
European Patent Office
Prior art keywords
piston
ring
tool
hand
air
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
EP19810890197
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0055244A1 (de
Inventor
Florian Hasewend
Johann Neumüller
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.)
Vereinigte Edelstahlwerke AG
Original Assignee
Vereinigte Edelstahlwerke 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 Vereinigte Edelstahlwerke AG filed Critical Vereinigte Edelstahlwerke AG
Publication of EP0055244A1 publication Critical patent/EP0055244A1/de
Application granted granted Critical
Publication of EP0055244B1 publication Critical patent/EP0055244B1/de
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
    • B25D17/24—Damping the reaction force

Definitions

  • the invention relates to a striking, hand-held compressed air tool, as is used for a wide variety of purposes, for example for the construction industry in general in industry and mining. Demolition hammers are an example of such tools.
  • DE-OS 23 26 087 discloses the use of an O-ring for damping the movement of a striker, which is driven indirectly by an electric motor.
  • a similar damping element is described in DE-OS 25 51 292, where it is arranged between a fixed sleeve of an impacting pneumatic hammer and the housing thereof, which causes the crown to rotate in its up and down movement.
  • the percussion piston in the housing is not damped.
  • DE-AS 10 34 557 describes the use of a rubber buffer ring. which is arranged between the cylinder and the retaining cap of the insertion tool, for buffering both the insertion tool and a stepped piston. In the case of an air-buffered step piston, this rubber buffer ring only serves to dampen the counter-impact of the insert tool.
  • An empty stroke is understood to mean that the impact surface of the accelerated piston does not come into contact with the impact surface of an intermediate piston or the shaft of the working tool.
  • the energy imparted to the piston must be effectively reduced without causing damage or converted into heat.
  • the empty impact energy is usually reduced by air buffers with additional safety precautions.
  • the air buffering of the accelerated piston has been achieved in that it is designed in the form of a piston shaft which can reciprocate in the cylinder of the tool and which has a piston part of smaller diameter, the piston head, on its front side, that is to say in the form of a stepped piston.
  • An annular compression space remains free between the piston head and the inner wall of the cylinder of the tool, which is delimited at one end by the bush for the working tool and at the other end by the step in the step piston.
  • the air cushion located there ensures when the piston moves towards the rear end of the shaft of the actual percussion tool, that is, for. B. the chisel, moves, due to the compression for an effective buffering of the piston.
  • the aim of the invention is to create a striking, hand-held pneumatic tool which does not have the disadvantages mentioned above.
  • the hand-held compressed air tools differ from the others in that they are designed to be relatively small, so that the volume which is used for air buffering is also to be kept small, even with small ones Leaks the air buffering can no longer be effective.
  • the invention is based on the known compressed air tools just described and relates to a striking, hand-held compressed air tool with a tool cylinder, within the bore of which a movable, compressed air-operated, piston piston and piston rod is arranged, which serves to actuate the working tool and to buffer the air, and one Buffer ring and consists essentially in that a buffer ring is arranged in the bore of the tool cylinder, which serves as a sleeve for the piston skirt and by a deformable material, for. B. steel, holding member is held in the bore, which is deformable via the buffer ring by the stepped piston.
  • the kinetic energy of the stepped piston is absorbed by the buffer ring in the event of an empty stroke, which is converted into deformation work and heat in the holding part.
  • the holding part is an interchangeable construction element, through which destruction z. B. the tool cylinder is prevented.
  • a particularly simple construction is realized when a compression space for air buffering is formed by the stepped piston, tool cylinder and buffer ring, and at the same time, if the air buffering is reduced in use by wear of the bore or the piston, a better braking of the piston by simply replacing the buffer ring is available again.
  • the holding part for the buffer ring is provided in a recess in the bore, it can be arranged at any suitable point in the bore, the transmission of the forces from the holding part to the cylinder being able to be solved particularly well by appropriately designing the recesses.
  • the recess is an annular groove, in which a preferably cylindrical retaining ring is arranged, a uniform transmission of the forces from the stepped piston to the tool cylinder can be achieved, even if the stepped piston moves within the tool cylinder with greater play.
  • a structurally particularly space-saving and therefore low-weight solution is obtained if the retaining ring encloses the buffer ring in its entire height.
  • the retaining ring on the side facing the working tool protrudes beyond the buffer ring enclosed by it, particularly gentle buffering of the stepped piston can be achieved, the buffering at the same time having longer distances to reduce the forces.
  • the buffer ring may have slots, so that a particularly simple assembly, for. B. also by inexperienced forces, can be carried out at the construction site.
  • the holding part is made of several parts and consists of individual springs that are arranged in corresponding grooves in the tool cylinder, the piston can be particularly gently buffered, whereby tilting of the buffer ring can be avoided with certainty by a symmetrical arrangement of at least three holding parts .
  • the essential advantage of the compressed air tool according to the invention is that whenever the buffer spring has not been installed on the tool for any reason and / or the piston skirt and / or the piston skirt bore have already been worn and there is therefore an insufficient air buffer, the «soft catch and retaining ring when the piston is badly buffered converts its impact energy into deformation work.
  • the buffer ring moves in the direction of the impact surface of the working tool and, on the one hand, this increases the compression or buffer space, i.e. the air cushion, and on the other hand, due to the shifting of the impact positions between the piston and the working tool (chisel, hammer), rhythm disturbances occur, which make the need for a Make the exchange of the combination of buffer ring and holding part and, if necessary, the piston clearly recognizable.
  • the necessary replacement of parts inferior to wear can be provided in good time without difficulty and the damage described above or even the destruction of the expensive cylinder are practically impossible.
  • the replacement of the wearing parts in the pneumatic tools according to the invention is also relatively simple, and the new tools are particularly customer-friendly and service-friendly.
  • the pneumatic tool shown in FIG. 1 is formed by the cylinder 2, over the end part of which the retaining cap 5 is screwed.
  • the compressed air-operated step piston 1 With the piston shaft 1a and a piston head 1b having a reduced diameter.
  • the piston head 1 b lies with its end face on the end face of the shank of the working tool 8 pressed against it by means of the buffer spring 6, for. B. a chisel.
  • the insertion end or the shank of the tool 8 is guided in the tool sleeve 7.
  • Via the return stroke channel 9 the compressed air for return stroke of the piston is supplied after the work cycle.
  • the annular compression space X for buffering the piston is formed between the piston head 1b and the wall of the bore of the cylinder 2. From the figure it can be clearly seen that the cylinder bore has different diameters at different points and that the recess described above, which represents a dead space, is present at the end of the piston head bore.
  • the compressed air tool according to the invention differs from the previously usual tools, as shown in FIG. 2, in that the piston head 1b of the stepped piston 1 is elongated and in a buffer ring 4, which consists of a holding part or holding ring made of deformable material, usually a metal, preferably soft steel, is enclosed, is guided.
  • the retaining ring can either have a relatively low height 3a and can be pressed into a single-conical ring groove 2a in the cylinder or as a ring with a relatively greater height 3b in a double-conical recess 2b in the cylinder bore with a constant diameter.
  • a compression space X is defined by the end face of the buffer ring 4, the inner wall of the cylinder 2 and the step from the piston skirt to the piston head, which no longer adjoins the end of the shaft of the working tool 8 and the bridge part 7 used to guide the working tool .
  • the air cushion in the compression chamber X effectively buffers the piston.
  • the buffer ring 4 with the retaining ring 3b is made in one piece, the retaining ring part having axial slots, as a result of which the retaining ring can spring together, so that this unit can be assembled easily and quickly.
  • Springs can also be provided as holding parts, which correspond in section to the holding ring 3b or 3a and are arranged in axially aligned grooves, at least 3 grooves having to be evenly distributed around the circumference.
  • the buffer ring 4 is displaced in the direction of the work tool and the retaining or catch ring 3 takes it from Piston 1 exerted energy on the buffer ring with more or less large deformation.
  • the buffer ring is moved in the direction of the insertion end of the working tool, the above-mentioned rhythm disturbances occur, which clearly indicate the wear that occurred before, so that the parts inferior to the wear can be replaced in good time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP19810890197 1980-12-19 1981-12-09 Schlagendes, handgehaltenes Druckluftwerkzeug Expired EP0055244B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT620180A AT368801B (de) 1980-12-19 1980-12-19 Schlagendes, handgehaltenes druckluftwerkzeug
AT6201/80 1980-12-19

Publications (2)

Publication Number Publication Date
EP0055244A1 EP0055244A1 (de) 1982-06-30
EP0055244B1 true EP0055244B1 (de) 1985-04-24

Family

ID=3583921

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810890197 Expired EP0055244B1 (de) 1980-12-19 1981-12-09 Schlagendes, handgehaltenes Druckluftwerkzeug

Country Status (5)

Country Link
EP (1) EP0055244B1 (cs)
AT (1) AT368801B (cs)
CS (1) CS254308B2 (cs)
DD (1) DD208106A5 (cs)
DE (1) DE3170203D1 (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7401661B2 (en) 2006-07-01 2008-07-22 Black & Decker Inc. Lubricant pump for powered hammer
US7413026B2 (en) 2006-07-01 2008-08-19 Black & Decker Inc. Lubricant system for powered hammer
US7624815B2 (en) 2006-07-01 2009-12-01 Black & Decker Inc. Powered hammer with vibration dampener
US7726413B2 (en) 2006-07-01 2010-06-01 Black & Decker Inc. Tool holder for a powered hammer
US8590633B2 (en) 2006-07-01 2013-11-26 Black & Decker Inc. Beat piece wear indicator for powered hammer
RU2790125C1 (ru) * 2022-07-18 2023-02-14 Федеральное государственное бюджетное образовательное учреждение высшего образования Новосибирский государственный архитектурно-строительный университет (Сибстрин) Пневматический молот

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE444401B (sv) * 1983-01-24 1986-04-14 Atlas Copco Ab Energiabsorberande inspenningsenhet for slagverktyg
DE3309187A1 (de) * 1983-03-15 1984-09-20 Robert Bosch Gmbh, 7000 Stuttgart Hammer, insbesondere bohrhammer
DE3405980A1 (de) * 1984-02-18 1985-08-22 Günter Horst 7927 Sontheim Röhm Schlagbohreinrichtung
JPS61148580U (cs) * 1985-03-01 1986-09-12

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE332236A (cs) *
DE1034557B (de) * 1954-11-12 1958-07-17 Hauhinco Maschf Presslufthammer
DE1033148B (de) * 1956-10-03 1958-06-26 Eisen & Stahlind Ag Pressluftschlagwerkzeug mit einem zwischen der unteren Zylinderbruecke und dem Schlagkolben angeordneten, elastischen Pufferring
DE6809332U (de) * 1968-11-30 1969-08-07 Bosch R Gmbh Motorisch angetriebener tragbarer bohrhammer
DE2023913B2 (de) * 1970-05-15 1978-11-02 Hilti Ag, Schaan (Liechtenstein) Elektropneumatischer Bohrhammer
DE2351242A1 (de) * 1973-10-12 1975-04-17 Bosch Gmbh Robert Motorisch angetriebener schlaghammer mit luftfederung
DE2437023A1 (de) * 1974-08-01 1976-02-12 Duss Maschf Schlag- oder drehschlaghammer
DE2743155A1 (de) * 1977-09-24 1979-04-05 Impex Essen Vertrieb Schlaghammer
DE2756993A1 (de) * 1977-12-21 1979-07-05 Duss Maschf Elektropneumatischer hammer mit fangring fuer den schlagkolben

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7413026B2 (en) 2006-07-01 2008-08-19 Black & Decker Inc. Lubricant system for powered hammer
US7624815B2 (en) 2006-07-01 2009-12-01 Black & Decker Inc. Powered hammer with vibration dampener
US7726413B2 (en) 2006-07-01 2010-06-01 Black & Decker Inc. Tool holder for a powered hammer
US7814986B2 (en) 2006-07-01 2010-10-19 Balck & Decker Inc. Lubricant system for powered hammer
US8590633B2 (en) 2006-07-01 2013-11-26 Black & Decker Inc. Beat piece wear indicator for powered hammer
US7401661B2 (en) 2006-07-01 2008-07-22 Black & Decker Inc. Lubricant pump for powered hammer
RU2790123C1 (ru) * 2022-07-11 2023-02-14 Федеральное государственное бюджетное образовательное учреждение высшего образования Новосибирский государственный архитектурно-строительный университет (Сибстрин) Пневматический молот
RU2789977C1 (ru) * 2022-07-11 2023-02-14 Федеральное государственное бюджетное образовательное учреждение высшего образования Новосибирский государственный архитектурно-строительный университет (Сибстрин) Пневматический молот
RU2790125C1 (ru) * 2022-07-18 2023-02-14 Федеральное государственное бюджетное образовательное учреждение высшего образования Новосибирский государственный архитектурно-строительный университет (Сибстрин) Пневматический молот
RU2790852C1 (ru) * 2022-07-18 2023-02-28 Федеральное государственное бюджетное образовательное учреждение высшего образования Новосибирский государственный архитектурно-строительный университет (Сибстрин) Пневматический молот
RU2793242C1 (ru) * 2022-07-18 2023-03-30 Федеральное государственное бюджетное образовательное учреждение высшего образования Новосибирский государственный архитектурно-строительный университет (Сибстрин) Пневматический молот
RU2796481C1 (ru) * 2022-07-18 2023-05-24 Федеральное государственное бюджетное образовательное учреждение высшего образования Новосибирский государственный архитектурно-строительный университет (Сибстрин) Пневматический молот
RU2796480C1 (ru) * 2022-07-18 2023-05-24 Федеральное государственное бюджетное образовательное учреждение высшего образования Новосибирский государственный архитектурно-строительный университет (Сибстрин) Пневматический молот
RU2799469C1 (ru) * 2022-07-18 2023-07-05 Федеральное государственное бюджетное образовательное учреждение высшего образования Новосибирский государственный архитектурно-строительный университет (Сибстрин) Пневматический молот

Also Published As

Publication number Publication date
CS254308B2 (en) 1988-01-15
EP0055244A1 (de) 1982-06-30
ATA620180A (de) 1982-03-15
DE3170203D1 (de) 1985-05-30
AT368801B (de) 1982-11-10
DD208106A5 (de) 1984-03-28

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