EP2855090A1 - Brennkraftbetriebenes setzgerät - Google Patents
Brennkraftbetriebenes setzgerätInfo
- Publication number
- EP2855090A1 EP2855090A1 EP12723871.5A EP12723871A EP2855090A1 EP 2855090 A1 EP2855090 A1 EP 2855090A1 EP 12723871 A EP12723871 A EP 12723871A EP 2855090 A1 EP2855090 A1 EP 2855090A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston guide
- piston
- grooves
- tool according
- hand 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.)
- Granted
Links
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
- B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
Definitions
- the present invention relates to a combustion-powered setting tool, as known for example from DE 10 2008 000 909 A1.
- a nail or similar fastener can be driven by the setting tool in a background.
- the necessary energy is generated by burning a fuel in a combustion chamber.
- a driving piston converts the energy released during combustion into a movement and strikes a nail with a pestle.
- the drive piston is mounted in a piston guide, in which the hot combustion gases can escape from the combustion chamber.
- the pressure-tight piston guide ensures that the excess pressure of the combustion gases can only dissipate under propulsion of the driving piston.
- the piston guide and the driving piston must be made to fit accurately to ensure the pressure-tight closure.
- the preparation of both the piston guide and the piston is therefore made of a solid body, which are trimmed by machining to the desired inner diameter and outer diameter. The surfaces must be aftertreated to achieve a high quality, also to remove burrs caused by drilling.
- the fastener-setting tool of the present invention has a combustion chamber for burning a fuel into combustion gases.
- a driving piston is guided on an inner surface of a tubular piston guide.
- the driving piston is driven by the combustion gases in the combustion chamber and the piston guide.
- the piston guide is formed from a bent to a tube sheet metal strip whose two opposite longitudinal edges are connected by a seam and / or a toothed positive connection. An albeit smaller but sufficient dimensional accuracy and dimensional stability can be achieved by means of a metal strip.
- the manufacturing method according to the invention makes it possible to introduce a vent opening into the piston guide, without complicated post-processing steps such as Grooving, deburring etc ..
- the manufacturing method provides to introduce holes in a metal strip, cold form the metal strip to a piston guide and connect longitudinal edges of the metal strip by a seam material fit and / or positively connect by a toothing. Subsequently, a drive piston is inserted into the piston guide.
- the inventive method represents a departure from the prejudice, the piston guide must be made of a solid body machined.
- vent openings are punched through an end of the piston guide remote from the combustion chamber.
- the punching foot is on the inner surface piston guide. The punching starting from the later inner surface ensures a burr-free inner surface. Although the inner surface is slightly deformed by the vaulted conical punch foot, but requires no post-processing, in particular no deburring.
- the inner surface is adapted in shape to the outer contour of the piston, so that it is clean and sealed pressure-tight.
- a slight deviation through depressions proves to be advantageous in terms of friction, without affecting the guide and in particular the pressure-tight seal essential for the concept of propulsion by means of the combustion gases.
- An embodiment provides that the depressions have a depth between 10 ⁇ and 100 ⁇ . Smaller depressions show no influence, it is assumed that the lubricating film compensates for these depressions. Larger depressions increased the abrasion of the sealing elements and thus reduced the life.
- a dimension of the recess parallel to the working axis is preferably less than 200 ⁇ .
- the depressions have an area fraction between 1% and 10% of the inner surface.
- An inner surface of the guide tube may be provided with a plurality of grooves running obliquely to the working axis and / or circular, square or diamond-shaped dents.
- the grooves have a length at least an order of magnitude greater than width.
- the dents are about the same length as they are wide.
- the oblique grooves reduce the frictional force without, as initially feared, significantly worsening a seal of the pneumatic chamber for the air spring. Overall, the efficiency of the impact mechanism could be increased, ie the ratio of the impact energy delivered by the racket to the tool to the energy supplied by the motor via the exciter could be increased.
- An embodiment provides that the grooves cross each other diamond-shaped.
- One group of grooves has a different direction of rotation about the working axis than the grooves of another group.
- An angle of inclination of the grooves with respect to the working axis is preferably in the range between 30 degrees and 50 degrees. This is especially true when the inclination of the grooves is constant over their entire length. In one embodiment, it is provided that the angle of inclination decreases along a direction of impact. The inclination angle is in the range of the impact point at 20 degrees to 40 degrees.
- Fig. 1 a setting device
- Fig. 2 is a piston guide
- Fig. 5 is a rolled inner surface of the piston guide
- Fig. 1 shows an exemplary setting tool 1 for nails 2, which is operated by means of a combustible fuel.
- the fuel is preferably a gas or a volatile liquid fuel.
- the setting tool 1 has a handle 3, with which the user can guide the setting tool and hold when setting the nails 2.
- the handle 3 is inseparable, rigid or by means of damping elements, connected to a housing 4 of the setting device 1.
- a trigger switch 5 At or near the handle 3 is a trigger switch 5, which triggers a setting operation when actuated by the user.
- a safety mechanism for example, by pressing the setting device to a wall, unlock.
- a cartridge 6 with the fuel is insertable into the housing 4.
- the cartridge 6 can be exchanged or refilled to replenish fuel.
- a combustion chamber 7 can be supplied with a portion of the fuel.
- a valve 8 releases a supply line 9 between the cartridge 6 and the combustion chamber 7 for a predefined time.
- the valve 8 measures a flow rate through the supply line 9 and closes after a predefined amount has flowed into the combustion chamber 7.
- the combustion chamber 7 is provided with a spark plug 10 or similar ignition device to ignite the gas flowed into the combustion chamber 7 or gases of the fuel evaporated in the combustion chamber 7.
- the combustion chamber 7 has a single outlet 11 through which the combustion gases can flow.
- a pulverulent fuel can also be used.
- the powder is advantageously portioned into cartridges, which can be inserted into the combustion chamber 7.
- the ignition device is designed to ignite the cartridges.
- the driving piston 12 driving combustion gases.
- a piston guide 13 and a drive piston 12 arranged in the piston guide 13 close off the outlet 11.
- the piston guide 13 is essentially a cylindrical tube which adjoins the combustion chamber 7.
- a diameter of the piston guide 13 is equal to or greater than the outlet 11.
- the combustion gases can flow from the combustion chamber 7 only in the piston guide 13.
- the piston guide 13 is circumferentially closed.
- a vent opening 14 is provided at one end of the piston guide 13 facing away from the combustion chamber 7. The combustion gases can only flow out through this vent opening 14 provided.
- the driving piston 12 is inserted into the piston guide 13.
- the driving piston 12 is movably mounted in the piston guide 13 along the working axis 15 predetermined by the piston guide 13.
- the example of a cylindrical drive piston 12 is precisely matched to the inner cross section of the piston guide 13.
- the drive piston 12 is fully against an inner wall 16 of the piston guide 13.
- a sealing ring can span the circumference of the drive piston 12 to compensate for manufacturing tolerances.
- the drive piston 12 closes the defined by the piston guide 13 and the combustion chamber 7 cavity. Since the combustion gases can escape neither through the combustion chamber 7 nor the piston guide 13, the combustion gases push the driving piston 12 along the working axis 15 in a direction away from the combustion chamber 7 drive direction 17.
- the driving piston 12 is accelerated and preferably achieves a predefined kinetic energy with low losses .
- the drive piston 12 is provided with a rigidly connected plunger 18.
- the rod-shaped plunger 18 projects into a nail holder 19.
- the nail holder 19 is for example tubular.
- a user inserts a nail into the nail receiver 19, or an automatic or semi-automatic delivery inserts a nail into the nail receiver 19.
- the accelerated with the drive piston 12 plunger 18 strikes the nail and pushes it in the direction of drive 17, for example, in a workpiece.
- the movement of the drive piston 12 and the plunger 18 in the drive direction 17 are stopped by a stop 20.
- the drive piston 12 passes over the vent opening 14 when the stop 20 is reached. The combustion gases can then escape.
- the piston guide 13 is made of a bent sheet metal strip 21, which is closed by a seam and / or a toothed closure along the working axis 15 (Fig. 2).
- the opposite edges 22 of the sheet metal strip 21 may be provided with a toothing, which engage in the bent to the piston guide 13 sheet metal strip 21.
- the toothing 23 may additionally be hermetically sealed by a weld. Alternatively, the toothing 23 may be hermetically sealed with a plastic.
- the sheet metal strip 21 is shown unrolled in FIG. 3.
- Fig. 4 shows the piston guide 13 in a cross section.
- An exemplary manufacturing method for the piston guide 13 begins with an endless belt.
- the endless belt preferably has a width which is about 0.5% to 2% less than a circumference of the piston guide 13 to be produced.
- a punch punches the Vent holes 14 in the endless belt.
- the punch preferably presses outward from the later inner surface 16 so that the punching indentation forms on the inner surface 16.
- the stamping indentation is an approximately funnel-shaped depression in the material of the endless band, which arises when the stamp is pressed through.
- a plurality of rollers roll the endless belt in several stages to form an endless tube. The page with the Stanzeinzug comes to lie on the inner surface of the tube.
- the opposite edges 22 of the endless band after forming are welded together. The welding can be done for example by induction. A corresponding welding probe can be held in the area in which the two edges 22 begin to touch. By welding, a seam 24 forms, which connects the two edges material fit and airtight.
- a punch can provide the edges 22 with the teeth 23.
- the toothing 23 of the two edges 22 come into engagement with each other during rolling of the endless belt.
- the toothing 23 can be created with a high accuracy of fit to achieve a sufficiently pressure-tight closure for the piston guide 13.
- the toothing 23 may be used alternatively or in addition to the weld 24.
- the toothing 23 can be closed on the outside by a silicone compound or other sealing means.
- the tube for the piston guide 13 is cut to length from the manufactured endless tube.
- the piston guide 13 is pushed one or more times over a calibration cylinder or calibration cone and thereby expanded to the desired extent.
- the circumference of the calibration cylinder is preferably perfectly circular and slightly larger than the inner circumference of the endless tube.
- the piston guide 13 is welded at one end to the combustion chamber 7.
- the driving piston 12 is inserted into the piston guide 13.
- Another manufacturing process begins with an endless belt whose width corresponds for example approximately to the length of the piston guide.
- the vents and if necessary toothing 23 are punched.
- a sheet metal strip 21 is separated and wound to the piston guide 13.
- the sheet metal strip 21 may be rectangular or rhombic.
- the edges 22 are welded together and / or connected by the teeth 23 pressure-tight with each other.
- the friction losses of the drive piston 12 on the inner surface 16 of the piston guide 13 should be as minimal as possible.
- a first reduction in friction is achieved by a lubricating film.
- a structured inner surface 16 also proves to be advantageous opposite a completely smooth inner surface.
- the inner surface 16 is provided with obliquely to the working axis 15 extending grooves 25.
- Fig. 3 shows the unrolled inner surface 16 of the piston guide 13.
- the grooves 25 have a depth 26 of more than 10 ⁇ (microns) and a depth 26 of less than 100 ⁇ .
- a width 27 of the grooves 25 is in the region of the depth 26.
- the grooves 25 are about easy to five times as wide as deep.
- the depth 26 is the dimension of the groove 25 in the radial direction, the width 27 the smallest dimension of the groove 25 on the inner surface 16 and the length is the largest dimension on the inner surface 16.
- the grooves 25 can be over the entire length 28 of the piston guide 13 extend.
- the grooves 25 extend helically along the inner surface 16. An inclination of the grooves 25 relative to the working axis 15 preferably remains constant over the length thereof.
- a first group 29 of the grooves 25 extends in a positive direction of rotation and a second group 30 of the grooves 25 runs in a negative direction of rotation.
- the grooves 25 of the two groups 29, 30 intersect alternately.
- Adjacent grooves 25, a group 29, 30, are arranged offset to one another at a distance of between 5,000 ⁇ m to 20,000 ⁇ m along the working axis 15.
- the inner surface 16 between the adjacent grooves 25 is preferably smooth. Smooth means that a roughness of the inner surface 16 between the grooves 25 is at least an order of magnitude smaller than the depth 26 of the grooves 25th
- An amount of the inclination angle 31 of the grooves 25 with respect to the working axis 15 is in the range between 30 degrees and 50 degrees.
- the relationship between the inclination in interaction with the driving piston 12, the sealing ring, the lubricating film and the periodically changing temperature and pressure conditions is not fully understood. Tilt angles 31 out of range, both smaller and larger, however, result in greater losses of the setting tool 1.
- the angle of inclination 31 of the helical grooves 25 is the difference of the pitch angle to 90 degrees.
- the grooves 25 are preferably rolled in the sheet metal strip 21 or introduced by another non-cutting method.
- the inner surface 16 thus remains free of burrs.
- a further embodiment provides for a variation of the angle of inclination 31 along the working axis 15.
- the inclination angle 31 with respect to the working axis 15 increases in the direction of drive 17. Near the rear reversal point, the piston guide 13 against the high air pressure in the combustion chamber 7 to be tight.
- vertical grooves 25 are preferred. However, this orientation of the grooves 25 probably creates a greater frictional resistance than grooves 15 parallel to the working axis 15.
- the angle of inclination 31 is between 40 degrees and 60 degrees near the combustion chamber 7 and decreases towards the stop 20 to between 20 degrees and 30 degrees ,
- One embodiment has punctiform dents 32 (FIG. 5) instead of or in addition to the grooves 25.
- the dents 32 have a depth 26 between 10 ⁇ and 100 ⁇ .
- a diameter 33 of the dimples 32 is approximately in the region of their depth 26.
- the dimples 32 are preferably arranged regularly, e.g. on nodes of a grid with rectangular or rhombic cells.
- the total area of the dimples 32 is significantly less than the inner surface 16, e.g. less than 10%.
- the remaining inner surface 16 is preferably smooth, i. has a roughness of significantly less than 10 ⁇ .
- the drive piston 12 is guided by the smooth inner surface 16.
- the dents 32 can be embossed, for example, with a stamp in the inner surface 16.
- the Aufsch embossing can be leveled by a subsequent rolling or stamping.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2012/059995 WO2013178246A1 (de) | 2012-05-29 | 2012-05-29 | Brennkraftbetriebenes setzgerät |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2855090A1 true EP2855090A1 (de) | 2015-04-08 |
| EP2855090B1 EP2855090B1 (de) | 2016-01-20 |
Family
ID=46172791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12723871.5A Active EP2855090B1 (de) | 2012-05-29 | 2012-05-29 | Brennkraftbetriebenes setzgerät |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20150136826A1 (de) |
| EP (1) | EP2855090B1 (de) |
| WO (1) | WO2013178246A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206509978U (zh) * | 2016-12-08 | 2017-09-22 | 创科(澳门离岸商业服务)有限公司 | 气动工具 |
Family Cites Families (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3422295A (en) * | 1966-09-01 | 1969-01-14 | Gen Electric | Permanent magnet stator with split casing and method of making |
| US3781022A (en) * | 1969-12-01 | 1973-12-25 | Rikagaku Kenkyusho | Piston ring and cylinder liner having minute oil-retaining indentation |
| US3735615A (en) * | 1970-05-19 | 1973-05-29 | J Shneider | Method of making grooves on surface of articles and device for its realization |
| US3961104A (en) * | 1973-06-11 | 1976-06-01 | John Ernest Tanner | Internal cylindrical bearing surfaces |
| US4086844A (en) * | 1976-02-18 | 1978-05-02 | Homuth Kenneth C | Hydraulic cylinder utilizing corrugated running surfaces |
| US4196547A (en) * | 1978-02-22 | 1980-04-08 | Caterpillar Tractor Co. | Cylinder liner honing |
| CA1319301C (en) * | 1984-09-06 | 1993-06-22 | Joseph V. Gary | Finish for cylinder liners |
| US4793054A (en) * | 1985-11-12 | 1988-12-27 | Black & Decker Inc. | Alignment system for permanent magnet motors |
| GB2326952B (en) * | 1997-07-03 | 2002-06-12 | Gkn Sheepbridge Stokes Ltd | Method of providing microscopic features |
| US6522042B1 (en) * | 2000-01-27 | 2003-02-18 | Black & Decker Inc. | Anchoring system for injection molded magnets on a flux ring or motor housing |
| US6903475B2 (en) * | 2001-02-23 | 2005-06-07 | Black & Decker Inc. | Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing |
| DE10302107A1 (de) * | 2003-01-21 | 2004-07-29 | Fuchs Technology Ag | Zylinderoberfläche |
| DE10333799B3 (de) * | 2003-07-24 | 2005-02-17 | Wacker Construction Equipment Ag | Hohlkolbenschlagwerk mit Luftausgleichs- und Leerlauföffnung |
| US9214844B2 (en) * | 2003-11-13 | 2015-12-15 | Kollmorgen Corporation | Method for securing a motor housing to a motor assembly |
| GB2410313B (en) * | 2004-01-22 | 2007-08-08 | Ford Global Tech Llc | An engine and a method of making same |
| DE102004047606A1 (de) * | 2004-09-30 | 2006-04-06 | Hilti Ag | Bohr- und/oder Meisselhammer |
| JP4622717B2 (ja) * | 2005-07-19 | 2011-02-02 | 株式会社アドヴィックス | プランジャ型マスタシリンダ |
| GB2431976B (en) * | 2005-11-05 | 2011-04-13 | Ford Global Tech Llc | An engine and a method of making same |
| JP5110251B2 (ja) * | 2006-08-25 | 2012-12-26 | マックス株式会社 | ガス燃焼式打込み工具 |
| CN101809271B (zh) * | 2007-10-05 | 2013-06-12 | 日本活塞环株式会社 | 气缸 |
| DE102008000909A1 (de) | 2008-04-01 | 2009-10-08 | Hilti Aktiengesellschaft | Brennkraftbetriebenes Setzgerät |
| DE102009026542A1 (de) * | 2009-05-28 | 2010-12-09 | Hilti Aktiengesellschaft | Werkzeugmaschine |
| FR2953752B1 (fr) * | 2009-12-11 | 2012-01-20 | Prospection & Inventions | Outil de fixation a moteur a combustion interne a butee de chambre unique d'ouverture et de fermeture |
| DE102011103105A1 (de) * | 2011-05-25 | 2012-11-29 | Mahle International Gmbh | Kolben für einen Verbrennungsmotor und Verfahren zur Herstellung des Kolbens |
| DE102012208986A1 (de) * | 2012-05-29 | 2013-12-05 | Hilti Aktiengesellschaft | Meißelnde Werkzeugmaschine |
-
2012
- 2012-05-29 WO PCT/EP2012/059995 patent/WO2013178246A1/de not_active Ceased
- 2012-05-29 US US14/402,740 patent/US20150136826A1/en not_active Abandoned
- 2012-05-29 EP EP12723871.5A patent/EP2855090B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013178246A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20150136826A1 (en) | 2015-05-21 |
| WO2013178246A1 (de) | 2013-12-05 |
| EP2855090B1 (de) | 2016-01-20 |
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