EP3349946A1 - Brenngasbetriebenes eintreibgerät mit aufladung - Google Patents
Brenngasbetriebenes eintreibgerät mit aufladungInfo
- Publication number
- EP3349946A1 EP3349946A1 EP16760727.4A EP16760727A EP3349946A1 EP 3349946 A1 EP3349946 A1 EP 3349946A1 EP 16760727 A EP16760727 A EP 16760727A EP 3349946 A1 EP3349946 A1 EP 3349946A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- seal
- combustion chamber
- housing
- sub
- axial direction
- 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
-
- 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
- B25C1/008—Safety devices
Definitions
- the invention relates to a tacker, in particular a hand-held tacker, according to the preamble of claim 1.
- EP 1 995 022 A1 describes a rechargeable tacker in which a combustion chamber has a first combustion chamber part fixed to the housing and a second, in the manner of a sleeve
- slidable combustion chamber part comprises.
- the combustion chamber parts are in one
- any part of the combustion chamber which forms a wall section of the closed combustion chamber is considered to be a part housing of the combustion chamber, except for the driving piston itself.
- the relative movement of such sub-housings is used to close and / or clamp the combustion chamber, with the Movement is coupled with a safety mechanism that requires a correct placement of the device on a workpiece.
- the first sub-housing comprises elements which are stationary with respect to a device housing, wherein the second sub-housing is axially displaceable relative to the first sub-housing.
- the axial direction is identical to a piston axis of the driving piston, whereby the mechanical structure is simplified as a whole.
- a monotonous increase in the pressure force with the overpressure is understood to mean that at least over a range of an operational overpressure of the combustion chamber an increase in the force acting on the seal in the axial direction is associated.
- an overpressure of the fuel gas mixture in the context of the invention, an increased pressure to increase the driving energy is understood.
- the pressure of the fuel gas mixture is usually slightly above an ambient pressure, since the pressurized fuel gas is added to the air under atmospheric pressure in the combustion chamber. This is only a slight increase in pressure.
- An overpressure according to the invention is preferably at least 100 mbar, more preferably at least 200 mbar above atmospheric pressure.
- an axial loading of the seal is understood to be a force application of the seal by a sealing surface whose force component in the axial direction is at least equal to or greater than a radially directed force component perpendicular thereto.
- the axial force component is at least twice as large, more preferably at least three times as large as the radial component.
- the seal is made of a polymer, preferably an elastomer.
- a preferred elastomer may be, for example, a natural rubber, a silicone rubber, a fluororubber or other fluorinated elastomer.
- Such seals have a high sealing effect with good tolerance to contamination or aging of the sealing surfaces.
- the axially loaded seal is formed as a closed ring seal.
- the sub-housing have a stop in their relative movement, wherein a sealed state of the sub-housing over the length of a sealing path is present before reaching the stop.
- a sealing path is understood to mean the distance in the axial direction between a beginning of the sealing action and a mechanically defined end or the stop of the movement. This allows a reliable seal also with regard to thermally or other conditional length changes or tolerances.
- the sealing path is expediently greater than the range of tolerances occurring.
- the sealing path is at least 0.2 mm, particularly preferably at least 0.4 mm. Particularly preferred is the sealing distance between 0.2 mm and 1, 5 mm.
- such a sealing path can be achieved in that the seal is reversibly deformed over the entire sealing path.
- a wall part of one of the sub-housing is resiliently deformable or serves as a stop.
- the second sub-housing forms a displaceable sleeve in the axial direction, wherein the first seal acts on a first end of the sleeve and a second seal on a second end of the sleeve.
- the overpressure presses the sleeve with respect to the first seal in the closing direction and presses in an opposite opening direction with respect to the second seal, with a resultant total force acting in the closing direction. This can be achieved, for example, in that the first seal in axial projection encloses a larger area than the second seal.
- the second sub-housing forms a displaceable in the axial direction bottom of the combustion chamber.
- the combustion chamber can form a variable, but closed volume when moving the sub-housing.
- the sub-housings are additionally sealed to one another via a radial seal acting perpendicular to the axial direction.
- the Radial seal allows a displacement of the sub-housing to each other, without a seal is completely canceled.
- the radial seal forms a seal of the combustion chamber during a thermal return operation of the drive piston. This allows a simple construction of the device with respect to a piston return. In this case, the hot reaction products of the fuel gas cool after the driving operation in the closed volume of the combustion chamber, resulting in a negative pressure and a corresponding restoring force.
- the radial seal is exposed to only relatively small pressure differences, while the first seal can be located at the same time out of engagement with the sub-housings.
- Fig. 1 shows a schematic sectional view of a tacker according to a
- first embodiment of the invention in a state with open combustion chamber.
- FIG. 2 shows a detailed view of the combustion chamber of the tacker of FIG. 1 in FIG
- Fig. 3 shows a schematic sectional view of a tacker according to a
- Second embodiment of the invention in a state with charged combustion chamber.
- Fig. 4 shows the tacker of Fig. 2 with partially collapsed combustion chamber.
- FIG. 5 is a sectional view showing a detail of the combustion chamber of FIG.
- the driving piston 4 comprises a driving ram 5 for driving a nail member (not shown) into a workpiece, not shown.
- An ignitable fuel gas mixture is presently introduced by means of a fuel gas storage 6 in the combustion chamber 2.
- the fuel gas mixture is compressed by means of a charging member 7 to an overpressure.
- the charging member is designed as an electrically driven and powered by a battery 8 compressor, which is arranged as an integral part of the tacker within the housing 1.
- the charging member is a device separated from the tacker.
- charging may also take place by means of a provision of the driving piston 4 driven in particular by combustion, or in some other way.
- the fuel gas is introduced via a metering valve 9 from the fuel gas storage 6 into the air of the combustion chamber 2.
- the fuel gas injection can take place in the not yet compressed, partially compressed or completely compressed air.
- the driving piston 4 is held by a piston holder (not shown) against the overpressure in the combustion chamber.
- the drive motor 13a is accommodated in an additional protective housing 13c within the combustion chamber, in which, in particular, damping material for protecting the engine from high accelerations can be provided.
- the combustion chamber 2 is to be understood in the ignitable state as a closed space whose wall is formed of several parts or sections. One of the sections is formed by the driving piston 4, which is accelerated in the direction of a piston axis A after ignition. Another section is formed by a first sub-housing 2a of the combustion chamber 2, which consists of stationary relative to the housing 1 positioned elements.
- a second sub-housing 2b of the combustion chamber 2 is designed as a sleeve movable relative to the first sub-housing 2a. In the present case, the second sub-housing 2b is exclusively linear and axially displaceable in the direction of the piston axis A.
- the sleeve 2a comprises at axially opposite ends radially projecting collar 14, on which sealing surfaces are formed for engagement with a first seal 15 and a second seal 16.
- the seals 15, 16 are present in each case at a first radially extending
- each of the seals can also be accommodated on the movable, second part housing.
- the seals 15, 16 are made of an elastomer and are designed as circumferential ring seals.
- An overpressure in the combustion chamber acts in the closed position of the second sub-housing on the one seal 15 in the opening direction and on the other seal 16 in the closing direction.
- the axial projections of the surfaces F1, F2, which are encompassed by the seals 15, 16, have different sizes.
- the surface F2 of the first seal 15, which is loaded by the overpressure in the closing direction of the sleeve, is significantly larger than the surface F1 of the second seal 16, which is relieved of the pressure in the opening direction of the sleeve.
- the increase in force takes place starting from a first sealing position of the second part housing via a defined sealing path while continuously increasing
- the sealing path is preferably between about 0.4 and 1, 5 mm depending on the aging state and elasticity of the seals 15, 16. Taking into account dimension and material of the seals 15, 16 a minimum sealing path is ensured, which is greater than occurring structural tolerances and thermally induced Length changes of the sub-housing 2a, 2b.
- the second sub-housing 2b is made up of two housing halves 19, 20
- the pressure can be controlled by a valve member (not shown) drained until the second part of the housing 2b can be moved again without force.
- the second part of the housing 2b may be connected to a known safety mechanism (not shown), so that only a controlled placement of the tacker on a workpiece to a displacement of the second part of the housing and a corresponding closing of the combustion chamber volume leads.
- the second exemplary embodiment shown in FIGS. 3 to 5 is a collapsing combustion chamber.
- the first stationary to the housing 1 of
- sub-housing 2a of the combustion chamber formed substantially as a hollow cylinder.
- a displaceable in the direction of the piston axis bottom forms the second part of the housing 2b in the context of the invention. Accordingly, in this
- Embodiment only a single axially loaded ring seal 15 needed to ensure a reliable seal.
- the bottom 2b In a clamped position of the combustion chamber 2, the bottom 2b abuts against the seal 15 in the axial direction. The bottom 2b is pressed with increasing pressure with increasing pressure force against the seal 15.
- a stop may be formed, and it may be provided by means of the elastic deformability of the seal 15, a defined sealing path.
- sealing of the bottom 2b with respect to the first sub-housing 2a may be desired to provide thermal recovery of the body
- the hot gases are first reduced to normal pressure via the outlet opening 12 after ignition, wherein the piston in the rebound overflows the openings 12 and the volume in cylinder and
- Combustion chamber 2 closes again. As it cools, it creates a negative pressure in the closed volume, pulling the piston towards the home position.
- a further radial seal 22 (FIG. 5) is provided on the bottom, which on the inner wall of the first
- Partial housing 2a slides.
- Fig. 5 shows a possible structural detail of the bottom 2b with the seals 15, 22.
- the first, axially loaded seal by means of a retaining ring 23 and a support ring 24 on the inner circumference of the first part housing 2a is set.
- the bottom or the movable second part housing 2 b presses against the elastic seal 15 with a bead-like projecting sealing surface.
- the radial seal 22 is inserted in a circumferential circumferential groove 25 of the bottom 2b and slides on the inner wall of the first housing part 2a. Since the radial seal the
- the movable part housing 2b is preferably coupled to a security mechanism of the tacker.
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 (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP15185079.9A EP3141348A1 (de) | 2015-09-14 | 2015-09-14 | Brenngasbetriebenes eintreibgerät mit ventilglied |
| EP15201878.4A EP3184249A1 (de) | 2015-12-22 | 2015-12-22 | Brenngasbetriebenes eintreibgerät mit aufladung |
| PCT/EP2016/070951 WO2017045972A1 (de) | 2015-09-14 | 2016-09-06 | Brenngasbetriebenes eintreibgerät mit aufladung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3349946A1 true EP3349946A1 (de) | 2018-07-25 |
| EP3349946B1 EP3349946B1 (de) | 2020-08-05 |
Family
ID=56877047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16760727.4A Active EP3349946B1 (de) | 2015-09-14 | 2016-09-06 | Brenngasbetriebenes eintreibgerät mit aufladung |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20180243891A1 (de) |
| EP (1) | EP3349946B1 (de) |
| CN (1) | CN107921614A (de) |
| WO (1) | WO2017045972A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3141347A1 (de) * | 2015-09-14 | 2017-03-15 | HILTI Aktiengesellschaft | Brenngasbetriebenes eintreibgerät mit ventilglied |
| US11279014B2 (en) | 2018-01-19 | 2022-03-22 | Max Co., Ltd. | Gas combustion type driving tool |
| US11819989B2 (en) | 2020-07-07 | 2023-11-21 | Techtronic Cordless Gp | Powered fastener driver |
| CA3167425A1 (en) | 2021-07-16 | 2023-01-16 | Techtronic Cordless Gp | Powered fastener driver |
| US12395046B2 (en) | 2022-07-22 | 2025-08-19 | Techtronic Cordless Gp | Firmware control providing a soft stop on compression drive nailer |
Family Cites Families (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3351256A (en) * | 1965-10-05 | 1967-11-07 | Bostitch Inc | Fluid actuated driving apparatus |
| GB1499587A (en) * | 1974-11-20 | 1978-02-01 | Max Co Ltd | Internal combustion machines |
| US4483474A (en) * | 1981-01-22 | 1984-11-20 | Signode Corporation | Combustion gas-powered fastener driving tool |
| US4483473A (en) * | 1983-05-02 | 1984-11-20 | Signode Corporation | Portable gas-powered fastener driving tool |
| DE3769470D1 (de) * | 1987-05-18 | 1991-05-23 | Joseph S Adams | Mehrfach detonationsmaschine. |
| DE10222338A1 (de) * | 2002-05-21 | 2003-12-04 | Hilti Ag | Brennkraftbetriebenes Setzgerät |
| US6779493B2 (en) * | 2002-06-13 | 2004-08-24 | Illinois Tool Works Inc. | Combustion mechanism for generating a flame jet |
| DE10259816B4 (de) * | 2002-12-19 | 2005-01-20 | Hilti Ag | Brennkraftbetriebenes Arbeitsgerät, insbesondere Setzgerät mit volumetrischer, gasförmiger Dosierung |
| DE602004013860D1 (de) * | 2003-03-19 | 2008-07-03 | Hitachi Koki Kk | Verbrennungskraftbetriebenes Werkzeug mit Vorrichtung zur Vermeidung von Überhitzung der mechanischen Komponenten im Werkzeug |
| US6863045B2 (en) * | 2003-05-23 | 2005-03-08 | Illinois Tool Works Inc. | Combustion apparatus having improved airflow |
| DE602004023998D1 (de) * | 2003-06-02 | 2009-12-24 | Makita Corp | Verbrennungsmotorwerkzeug |
| JP4144472B2 (ja) * | 2003-08-11 | 2008-09-03 | 日立工機株式会社 | 燃焼式動力工具 |
| JP4930672B2 (ja) * | 2005-08-09 | 2012-05-16 | マックス株式会社 | ガス燃焼式打込み工具のファスナー送り機構 |
| DE102005000149A1 (de) * | 2005-11-04 | 2007-05-10 | Hilti Ag | Brennkraftbetriebenes Setzgerät |
| DE102005000200B4 (de) * | 2005-12-21 | 2014-07-03 | Hilti Aktiengesellschaft | Brennkraftbetriebenes Setzgerät |
| JP5055793B2 (ja) * | 2006-03-10 | 2012-10-24 | マックス株式会社 | ガス燃焼式打込み工具 |
| DE102006000127B4 (de) * | 2006-03-22 | 2015-05-13 | Hilti Aktiengesellschaft | Brennkraftbetriebenes Setzgerät |
| JP4992404B2 (ja) * | 2006-12-08 | 2012-08-08 | マックス株式会社 | ガス燃焼式打込み工具 |
| JP4957899B2 (ja) * | 2007-05-10 | 2012-06-20 | マックス株式会社 | ガスネイラの燃焼室構造 |
| DE102007000373A1 (de) * | 2007-07-11 | 2009-01-15 | Hilti Aktiengesellschaft | Brennkraftbetriebenes Setzgerät |
| AU2008346772B2 (en) * | 2008-01-04 | 2011-11-24 | Illinois Tool Works Inc. | Single component intake/exhaust valve member, fuel distribution system, and cooling system for combustion-powered fastener-driving tool |
| DE102010063177A1 (de) * | 2010-12-15 | 2012-06-21 | Hilti Aktiengesellschaft | Bolzensetzgerät und Verfahren zum Betreiben eines Bolzensetzgerätes |
| DE102010063173A1 (de) * | 2010-12-15 | 2012-06-21 | Hilti Aktiengesellschaft | Bolzensetzgerät und Verfahren zum Betreiben eines Bolzensetzgerätes |
| EP2851157A1 (de) * | 2013-09-19 | 2015-03-25 | HILTI Aktiengesellschaft | Eintreibvorrichtung mit pneumatischem Speicher |
| US9862083B2 (en) * | 2014-08-28 | 2018-01-09 | Power Tech Staple and Nail, Inc. | Vacuum piston retention for a combustion driven fastener hand tool |
-
2016
- 2016-09-06 US US15/758,000 patent/US20180243891A1/en not_active Abandoned
- 2016-09-06 WO PCT/EP2016/070951 patent/WO2017045972A1/de not_active Ceased
- 2016-09-06 EP EP16760727.4A patent/EP3349946B1/de active Active
- 2016-09-06 CN CN201680050129.0A patent/CN107921614A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN107921614A (zh) | 2018-04-17 |
| US20180243891A1 (en) | 2018-08-30 |
| WO2017045972A1 (de) | 2017-03-23 |
| EP3349946B1 (de) | 2020-08-05 |
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