EP1289715B1 - Kompakter drucklufthammer - Google Patents

Kompakter drucklufthammer Download PDF

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Publication number
EP1289715B1
EP1289715B1 EP01934082A EP01934082A EP1289715B1 EP 1289715 B1 EP1289715 B1 EP 1289715B1 EP 01934082 A EP01934082 A EP 01934082A EP 01934082 A EP01934082 A EP 01934082A EP 1289715 B1 EP1289715 B1 EP 1289715B1
Authority
EP
European Patent Office
Prior art keywords
hammer
cylinder
air chamber
hammer according
handle
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
EP01934082A
Other languages
English (en)
French (fr)
Other versions
EP1289715A1 (de
Inventor
Robert Lassartesses
Louise Buquet
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP1289715A1 publication Critical patent/EP1289715A1/de
Application granted granted Critical
Publication of EP1289715B1 publication Critical patent/EP1289715B1/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
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/041—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with fixed main cylinder

Definitions

  • the invention relates to a pneumatic hammer having a small footprint.
  • Pneumatic one-shot hammers are well known in the art.
  • the body typically comprises an inner cylinder and an outer shell between which there is an air reserve chamber.
  • a piston or a pair of spaced pistons mounted on an axial shaft whose front end forms the striker can move in the cylinder under the effect of compressed air stored in the chamber.
  • the chamber is itself placed in communication with a source of compressed air, when the trigger is actuated, by a pipe connecting a connection provided on the hammer to said source of compressed air.
  • the reserve of air between the cylinder and the envelope must have a volume large enough for the hammer to work well.
  • the one-shot pneumatic hammer is a tool that has been designed for this purpose. This tool is used to hit the fasteners holding plastic parts (shields, door bins ...) present in cars. By a simple percussion it allows to release the plastic parts virgin of any other material.
  • the dismantling tools are modeled and the car design incorporates the space that will be needed for the tool to be used.
  • the constraints it imposes today during the design are important given the size of the tool.
  • the present invention aims to satisfy this need.
  • the present invention relates to a pneumatic hammer comprising a single body comprising a cylinder and a casing surrounding the cylinder and leaving between them a first air chamber, a hollow handle integral with said body and housing a second air chamber communicating with the first, at least one piston mounted on an axial shaft whose front end forms the striker and can move in the cylinder under the effect of compressed air stored in the air chambers, and means for actuating the hammer controlled by a trigger, said hammer being connected to a flexible hose connecting one of said chambers to a source of compressed air, characterized in that the rear part of the hammer is formed by the hollow handle whose internal cavity forms a second air chamber communicating with the first air chamber.
  • the handle is mounted at the rear of the body.
  • the handle has, seen from the side, the general shape of an inverted U, one of whose branches is secured to a rear face of the body.
  • the hose connects the second air chamber to the source of compressed air.
  • the envelope surrounding the rear portion of the cylinder has a cross section decreasing from the back to the front of the hammer.
  • the necessarily reduced volume of the first air chamber is compensated, resulting from the fact that the envelope does not extend around the anterior part of the cylinder, by the second air chamber formed in the handle, on the one hand, and by the additional air chamber in the oversized end section of the hose, on the other hand.
  • the front part of the cylinder is no longer surrounded by an envelope, the front portion of the hammer is much less bulky than in the case where the entire cylinder is surrounded by an envelope as in the hammers of the art prior.
  • the figure 1 illustrates a pneumatic hammer of known type marketed by the American company PNEUTEK.
  • This hammer comprises a body 1 comprising a cylinder 2 and an outer casing 3 surrounding the cylinder and leaving between them an air chamber 4.
  • a pair of pistons 5, 6 secured on a shaft 7 of which anterior end 8, itself slidably mounted in a nose 9, forms the striker.
  • the hammer may be connected by the connector 10 to a flexible hose 11 connected to a source of compressed air (not shown) so as to continuously supply compressed air to the chamber 4.
  • the hammer comprises, in addition, a handle 12 and a trigger 13 whose pressing controls the actuation of the hammer, that is to say the rapid forward movement of the pair of pistons and, therefore, the striking of the striker. The release of this trigger causes the displacement in the opposite direction of the piston and, therefore, the return of the firing pin.
  • Such a hammer is bulky and heavy.
  • the figure 2 illustrates a hammer according to the present invention.
  • the outer shell 3 surrounds only the rear portion 2b of the cylinder 2 and leaves bare the front portion 2a of the cylinder, which is about 0.5 times the total length of said cylinder.
  • the envelope 3 surrounding the rear portion is profiled, having a cross section decreasing from the rear to the front of the hammer.
  • the rear part of the hammer is formed by a hollow handle 22 whose internal cavity forms a second air chamber 23 communicating with the chamber 4 by passages 24.
  • the handle 22 has, from the side, the general shape of an inverted U and is secured to the rear face of the body 1 by one branches of the U, as shown. This arrangement at the rear of the handle helps to clear the front of the hammer and, therefore, increases its ability to penetrate areas of poor accessibility.
  • the hammer also has a trigger 25 for controlling its operation.
  • Said trigger 25 is fixed inside the U formed by the handle 22, on the wall opposite to the gripping zone.
  • the handle 22 is, moreover, connected to its base, by means of a screw connection 26, to a flexible hose 27 which can be connected to a source of compressed air (not shown).
  • This flexible pipe 27 has the particularity of having a terminal section 28 adjacent to the handle 22, of oversized cross section relative to the section of the remainder of the pipe.
  • the oversized terminal section of the flexible pipe may have an internal diameter of 10 to 30 mm while, over the rest of its length, the pipe conventionally has an internal diameter of 5 to 10 mm.
  • the length of the oversized terminal section may be, for example, 50 to 150 mm.
  • This oversized section 28 forms an additional air chamber 29 immediately adjacent and communicating with the chamber 23.
  • the air chambers 23 and 29 serve to compensate for the reduced volume of the chamber 4 and allow satisfactory operation of the hammer. Room 23 would be insufficient on its own to
  • the invention makes it possible to produce a lighter hammer and especially much less bulky than the hammers of the prior art, which allows to use it in places that would be inaccessible to the latter.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (10)

  1. Einzelschlag-Presslufthammer, mit einem Körper (1), der einen Zylinder (2) und ein den Zylinder (2) umgebendes Gehäuse (3) enthält und zwischen beiden eine erste Luftkammer (4) bildet, einem mit dem Körper (1) fest verbundenen hohlen Griff (22), wenigstens einem Kolben (5, 6), der an einer Axialwelle (7) angebracht ist, deren vorderes Ende (8) den Schlagbolzen bildet und sich in dem Zylinder (2) unter der Wirkung der Druckluft, die in den Luftkammern gespeichert ist, verlagern kann, und Mitteln zum Betätigen des Hammers, die durch einen Drücker (25) gesteuert werden, wobei der Hammer mit einem flexiblen Schlauch (27) verbunden ist, der ihn mit einer Druckluftquelle verbindet, dadurch gekennzeichnet, dass der hintere Teil des Hammers durch den hohlen Griff (22) gebildet ist, dessen Innenhohlraum eine zweite Luftkammer (23) bildet, die mit der ersten Luftkammer (4) kommuniziert.
  2. Hammer nach Anspruch 1, dadurch gekennzeichnet, dass der Griff (22) bei Betrachtung von der Seite die allgemeine Form eines umgedrehten U hat, wovon einer der Schenkel mit einer Rückseite des Körpers (1) fest verbunden ist.
  3. Hammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zweite Luftkammer (23) die allgemeine Form eines L hat.
  4. Hammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der flexible Schlauch (27) an seinem mit dem Hammer verbundenen Ende ein überdimensioniertes Teilstück aufweist, das eine zusätzliche Luftkammer (29) für den Hammer bildet.
  5. Hammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das überdimensionierte Teilstück (29) eine Länge im Bereich von 50 bis 150 mm hat.
  6. Hammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das überdimensionierte Teilstück (29) einen Durchmesser im Bereich von 10 bis 30 mm hat.
  7. Hammer nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass der Drücker (25) an dem hinteren Teil des Hammers innerhalb des durch den Griff (22) gebildeten U gelenkig befestigt ist.
  8. Hammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Gehäuse (3), das den hinteren Teil (2b) des Zylinders (2) umgibt, einen transversalen Querschnitt besitzt, der vom hinteren Teil des Körpers zum vorderen Teil (2a) des Zylinders (2) abnimmt.
  9. Hammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der vordere Teil (2a) des Zylinders (2) auf einer Länge, die wenigstens gleich der 0,4-fachen Länge des Zylinders (2) ist, unabgedeckt ist.
  10. Hammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Länge des Zylinders (2) wenigstens gleich dem Außendurchmesser des Zylinders (2) ist.
EP01934082A 2000-05-10 2001-05-10 Kompakter drucklufthammer Expired - Lifetime EP1289715B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0005949 2000-05-10
FR0005949A FR2808717B1 (fr) 2000-05-10 2000-05-10 Marteau pneumatique d'encombrement reduit
PCT/FR2001/001418 WO2001085397A1 (fr) 2000-05-10 2001-05-10 Marteau pneumatique d'encombrement reduit

Publications (2)

Publication Number Publication Date
EP1289715A1 EP1289715A1 (de) 2003-03-12
EP1289715B1 true EP1289715B1 (de) 2008-07-02

Family

ID=8850062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01934082A Expired - Lifetime EP1289715B1 (de) 2000-05-10 2001-05-10 Kompakter drucklufthammer

Country Status (5)

Country Link
EP (1) EP1289715B1 (de)
DE (1) DE60134642D1 (de)
ES (1) ES2305074T3 (de)
FR (1) FR2808717B1 (de)
WO (1) WO2001085397A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471604A (en) * 1947-03-07 1949-05-31 Charles F Boyer Safety device for pneumatic tools
BE536815A (de) * 1954-03-26
GB826644A (en) * 1955-11-14 1960-01-13 Modernair Corp Pneumatically operated fastener driving machine
FR1498705A (fr) * 1966-10-04 1967-10-20 Bostitch Inc Outil pneumatique d'enfoncement

Also Published As

Publication number Publication date
ES2305074T3 (es) 2008-11-01
EP1289715A1 (de) 2003-03-12
DE60134642D1 (de) 2008-08-14
FR2808717B1 (fr) 2002-07-12
WO2001085397A1 (fr) 2001-11-15
FR2808717A1 (fr) 2001-11-16

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