EP1289715A1 - Marteau pneumatique d'encombrement reduit - Google Patents
Marteau pneumatique d'encombrement reduitInfo
- Publication number
- EP1289715A1 EP1289715A1 EP01934082A EP01934082A EP1289715A1 EP 1289715 A1 EP1289715 A1 EP 1289715A1 EP 01934082 A EP01934082 A EP 01934082A EP 01934082 A EP01934082 A EP 01934082A EP 1289715 A1 EP1289715 A1 EP 1289715A1
- 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.)
- Granted
Links
- 230000000694 effects Effects 0.000 claims abstract description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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 reduced bulk.
- One-shot pneumatic hammers are well known in the art. They consist of a body and a handle, and a trigger controlling the actuation of the hammer blow by blow.
- the body typically comprises an internal cylinder and an external envelope between which there is a chamber forming an air reserve.
- a piston or a pair of spaced pistons mounted on an axial shaft whose anterior 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 fitting provided on the hammer to said source of compressed air.
- the air reserve provided between the cylinder and the envelope must have a volume large enough for the hammer to work well.
- the air chamber formed between the cylinder and the outer casing is supplemented by a second air chamber formed in the handle of the hammer, as described for example in US-A-4,122,904.
- the pneumatic hammer is a tool that has been designed with this in mind. This tool is used to strike the fasteners retaining the plastic parts (shields, door trays ...) present in cars. By a simple percussion it makes it possible to release the virgin plastic parts of any other material.
- the dismantling tools are modeled and the car design incorporates the space that will be necessary for the tool to be used.
- the constraints it imposes today during the design are important given the size of the tool.
- the weight of the hammer (typically about 4 kg) makes it difficult to use and therefore impractical for operators.
- the present invention aims to satisfy this need.
- the present invention relates to a single blow pneumatic hammer comprising a body comprising a cylinder and an envelope surrounding the cylinder and providing between them a first air chamber, a handle integral with said body and housing a second air chamber communicating with the first, at less a piston mounted on an axial shaft whose anterior end forms the striker and which 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 pipe connecting one of said chambers to a source of compressed air, characterized in that: the front part of the cylinder is left exposed over a length of at least 0.4 times, preferably at minus 0.5 times, the length of said cylinder; and the flexible pipe has, at its end connected to the hammer, an oversized section relative to the rest of the pipe, said oversized section forming an additional air chamber for the hammer.
- the handle is mounted at the rear of the body.
- the handle has, viewed from the side, the general shape of an inverted U, one of the branches of which is integral with the rear of the body.
- the flexible hose connects the second air chamber to the source of compressed air.
- the envelope surrounding the rear part of the cylinder has a cross section decreasing from the rear towards the front of the hammer.
- the necessarily reduced volume of the first air chamber is compensated for, resulting from the fact that the envelope does not extend around the front part of the cylinder; by the second air chamber formed in the handle, on the one hand, and by the additional air chamber formed in the oversized end section of the flexible pipe, on the other hand. Since 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 art prior.
- Figure 1 is a schematic view in longitudinal section of a pneumatic hammer single shot according to the prior art.
- Figure 2 is a schematic view, partially in longitudinal section of a pneumatic hammer in accordance with the invention.
- FIG. 1 illustrates a pneumatic hammer of known type sold by the American company PNEUTEK.
- This hammer comprises a body 1 comprising a cylinder 2 and an external envelope 3 surrounding the cylinder and providing between them an air chamber 4.
- a pair of pistons 5, 6 secured on a shaft 7, the anterior end 8, itself slidably mounted in a nose 9, forms the striker.
- the hammer can be connected by the connector 10 to a flexible hose 11 connected to a source of compressed air (not shown) so as to supply compressed air, continuously, to the chamber 4.
- the hammer further comprises a handle 12 and a trigger 13, the pressing of which 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 piston to move in the opposite direction and, therefore, the return of the striker.
- Such a hammer is bulky and heavy.
- Figure 2 illustrates a hammer according to the present invention.
- the outer casing 3 no longer surrounds the rear part 2b of the cylinder 2 and leaves bare the front part 2a of the cylinder, which represents approximately 0.5 times the total length of said cylinder.
- the envelope 3 surrounding the rear part 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, the internal cavity forms a second air chamber 23 communicating with the chamber 4 by passages 24.
- the handle 22 has, viewed 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 contributes to clearing the front part of the hammer and, therefore, increases its ability to penetrate places of poor accessibility.
- the hammer also includes a trigger 25 used to control its operation.
- Said trigger 25 is fixed inside the U formed by the handle 22, on the wall opposite the gripping zone.
- the handle 22 is, moreover, connected to its base, by means of a screw connection 26, to a flexible pipe 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 rest of the pipe.
- the oversized end 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 can be, for example, from 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 alone would be insufficient to achieve this result.
- the invention makes it possible to produce a lighter hammer and above all much less bulky than the hammers of the prior art, which makes it possible to use it in places which would be inaccessible to the latter. As an indication, we could build a hammer whose diameter of the front part was only 64 mm, to compare with a diameter of 120 mm for a hammer of the kind of that of figure 1 and that for equivalent striking performances .
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0005949A FR2808717B1 (fr) | 2000-05-10 | 2000-05-10 | Marteau pneumatique d'encombrement reduit |
| FR0005949 | 2000-05-10 | ||
| PCT/FR2001/001418 WO2001085397A1 (fr) | 2000-05-10 | 2001-05-10 | Marteau pneumatique d'encombrement reduit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1289715A1 true EP1289715A1 (fr) | 2003-03-12 |
| EP1289715B1 EP1289715B1 (fr) | 2008-07-02 |
Family
ID=8850062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01934082A Expired - Lifetime EP1289715B1 (fr) | 2000-05-10 | 2001-05-10 | Marteau pneumatique d'encombrement reduit |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1289715B1 (fr) |
| DE (1) | DE60134642D1 (fr) |
| ES (1) | ES2305074T3 (fr) |
| FR (1) | FR2808717B1 (fr) |
| WO (1) | WO2001085397A1 (fr) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2471604A (en) * | 1947-03-07 | 1949-05-31 | Charles F Boyer | Safety device for pneumatic tools |
| DE1176579B (de) * | 1954-03-26 | 1964-08-20 | United Shoe Machinery Corp | Vorrichtung zum Zufuehren jeweils eines Nagels od. dgl. zu einem Nageleintreibwerkzeug |
| 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 |
-
2000
- 2000-05-10 FR FR0005949A patent/FR2808717B1/fr not_active Expired - Fee Related
-
2001
- 2001-05-10 ES ES01934082T patent/ES2305074T3/es not_active Expired - Lifetime
- 2001-05-10 WO PCT/FR2001/001418 patent/WO2001085397A1/fr not_active Ceased
- 2001-05-10 EP EP01934082A patent/EP1289715B1/fr not_active Expired - Lifetime
- 2001-05-10 DE DE60134642T patent/DE60134642D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0185397A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2808717B1 (fr) | 2002-07-12 |
| EP1289715B1 (fr) | 2008-07-02 |
| DE60134642D1 (de) | 2008-08-14 |
| WO2001085397A1 (fr) | 2001-11-15 |
| ES2305074T3 (es) | 2008-11-01 |
| FR2808717A1 (fr) | 2001-11-16 |
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