EP3393719A1 - Pyrotechnic driving tool - Google Patents
Pyrotechnic driving toolInfo
- Publication number
- EP3393719A1 EP3393719A1 EP16819544.4A EP16819544A EP3393719A1 EP 3393719 A1 EP3393719 A1 EP 3393719A1 EP 16819544 A EP16819544 A EP 16819544A EP 3393719 A1 EP3393719 A1 EP 3393719A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spring
- hammer
- ignition
- igniter
- tacker
- 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
- B25C1/008—Safety devices
-
- 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
- B25C1/10—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
- B25C1/14—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil
- B25C1/146—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil operated by a hammer blow
-
- 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
- B25C1/10—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
- B25C1/14—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil
- B25C1/143—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil trigger operated
Definitions
- the invention relates to a tacker, in particular a hand-held tacker, according to the preamble of claim 1.
- the invention relates to tacking devices in which a driving piston is accelerated by a rapidly expanding gas as part of a combustion process of a propellant charge.
- Conventional types of such devices use this powder cartridges, caseless propellant charges in the form of charge stiffeners or the like.
- a voltage of a pin-shaped ignition hammer is usually carried out by pressing a Aufsetzgliedes of the device against a workpiece. By a corresponding stroke of the Aufsetzgliedes a cartridge bearing of the device is closed and the ignition hammer clamped against a spring.
- DE 102 53 668 B4 describes a pyrotechnic tacking device, in which an ignition unit is moved during a driving operation by the gas pressure in a part-tensioned against a spring and held by a detent position. A complete voltage of the ignition unit then takes place as in the device DX 460 by pressing a Aufsetzgliedes.
- the partial tensioning of the ignition unit by means of the gas pressure is structurally realized in that the ignition unit is integrally or functionally identical designed as a shock absorber bottom of the device.
- the relatively large mass of the impact floor / the ignition unit initially accelerates by a spring on the propellant charge, ignites it and then serves as a backward accelerated against the spring counter bearing for the gas pressure.
- a component which is set with a front end on the workpiece and pressed by a defined stroke to release a setting process serves as a reliable safety device in the operation of the tacker.
- the attachment member may be formed, for example, as a sleeve arranged concentrically to a central axis of the device. Alternatively, it may for example also be a laterally offset to the central axis arranged Friedeil.
- a cartridge chamber of the propellant charge is closed only by the impressions of the Aufsetzgliedes, so that a misfire of a propellant charge without depressed Aufsetzglied can not lead to a significant acceleration of the piston member.
- a firing hammer is understood to mean any element which is movably received with respect to the propellant charge and which is accelerated to trigger the propellant charge and moved against an igniter of the propellant charge.
- the primer may preferably be formed as a linearly movable pin.
- An igniter according to the invention may, for example, be a shock-sensitive charge in a firing plate, a firing edge in a rimfire cartridge, a strike-sensitive firing zone of a charge strip or the like.
- a shock absorber is understood to mean a component which supports the forces in the acceleration of the piston to the rear and thus initially absorbs part of a recoil of the device.
- the shock pad is movable received against a housing of the device, whereby the forces acting on an operator maximum forces can be reduced.
- each device by means of which the tensioned spring held and can be released if necessary by the operator. The release of the tensioned spring accelerates the ignition hammer.
- the first spring can be any suitable mechanical energy store, for example a metal spiral spring or a gas spring.
- the impact bottom is moved counter to the driving direction by the gas pressure and thereby tensions the first spring. This allows a simple and reliable mechanical realization of a voltage of the first spring by the gas pressure.
- the thrust floor can be subjected to a force in the driving direction by means of a shock-absorbing spring.
- a shock-absorbing spring usually has a larger spring constant than the first spring.
- the holding member comprises a spring-loaded locking catch.
- the detent lock engages and holds the first spring in the tensioned state.
- the first spring is alternatively brought by the pressing of the Aufsetzgliedes in the held and tensioned state.
- This allows a simple construction and intuitive operation. In general, only a first clamping operation of the spring is made by the pressing of the Aufsetzgliedes to allow the first ignition of a propellant charge.
- the first spring was then tensioned in each case by the gas pressure of the preceding setting process, so that this reduced contact pressure of Aufsetzgliedes be achieved. Finally, then the first spring can be specifically relaxed, for example, for the purpose storage or maintenance of the device.
- an additional tensioning lever or the like for tensioning the first spring can also be provided before a first setting operation.
- the ignition hammer is subjected to a force in the direction of the igniter by means of a second spring.
- the second spring has a smaller spring constant than the first spring.
- the primer can be kept even when the first spring tensioned first in a forward position, whereby a high reliability against a false triggering of a propellant charge, for example by dropping the device or the like, is achieved.
- the second spring is particularly preferably brought into a tensioned state exclusively by the pressing of the attachment member. Since the force of the second spring is not required for the acceleration of the ignition hammer, this can be dimensioned so weak that their resistance when pressing the device is irrelevant.
- the movement of the ignition hammer between a relaxed stop of the first spring and a contact of the igniter has a free path.
- the firing hammer thus moves in its last movement section no longer under the action of force of the first spring, but only as a result of its inertia.
- this allows the provision of effective security measures against a faulty deployment of the propellant charge.
- the propellant charge can not be triggered if the igniter is already at a forward position in the event of a faulty release of the first spring.
- Fig. 1 shows a schematic overall view of an inventive
- Fig. 2 shows a partial sectional view of a first embodiment of the
- FIG. 3 shows the embodiment of Fig. 2 in a cocked and non-mounted state.
- FIG. 4 shows the embodiment of FIG. 2 in a tensioned and attached
- Fig. 5 shows a partial sectional view of a second embodiment of
- FIG. 6 shows the embodiment of Fig. 5 in a tensioned and non-mounted state.
- a tacker according to the invention comprises a hand-guided housing 1, in which a piston member in the form of a piston 2 is received.
- a rear surface of the piston 2 defines a combustion chamber 3 in which the combustion gases of a pyrotechnic propellant charge 4 expand to accelerate the piston 2.
- the thus provided with kinetic energy piston 2 strikes with an end-side plunger on a fastener (not shown), which is thereby driven into a workpiece.
- the propellant charge 4 is presently received on a charge strip 5 with a plurality of cartridge-shaped charges (FIG. 3).
- the propellant charge 4 has a shock-sensitive igniter 4a in an edge region.
- a charge bearing 6, which adjoins the combustion chamber 3 is driven against the propellant charge 4 via a corresponding mechanism (see ignition-ready state in FIG. 4).
- a relative to the housing 1 slidable Aufsetzglied 7 is arranged at the front end of the device and connected to the charge bearing 6.
- the Aufsetzglied 7 is placed in the course of a driving operation on the workpiece and against a spring force by a defined stroke H (see FIG. 5) inserted.
- H a defined stroke
- the charge bearing 6 is pressed back against the propellant charge 4.
- the ignition takes place by impact of an accelerated against the igniter 4a a propellant charge 4 firing hammer 8.
- the firing hammer 8 is present essentially formed as a parallel to a driving direction movably mounted pin.
- the firing hammer 8 is arranged in a central recess of a likewise movable parallel to the driving direction shock bottom 9, the firing hammer 8 also is movable relative to the shock bottom 9.
- a tip 8a of the firing hammer 8 can pass through a front opening of the impact pad 9 and strike the igniter 4a.
- the firing hammer 8 is supported by means of a first spring 10 relative to the housing 1 and subjected to a force in the direction of the propellant charge 4.
- the first spring 10 is mounted on the front side in a sleeve 1 1, wherein the sleeve 1 1 is slidably guided on the thrust plate 9.
- a front stop 12 of the sleeve 1 1 at the joint bottom 9 defines a maximum relaxed position of the first spring 10.
- the stopper 12 is positioned so that the ignition hammer 8 at investment of the sleeve 1 1 on the stop 12 is still a free distance of about 2 mm to contact the igniter 4a has.
- the shock bottom 9 is in turn supported by a shock-absorbing spring 13 relative to the housing 1.
- the first spring 10 is structurally expediently arranged concentrically within the shock bottom spring 13.
- a damper 14 made of elastic material is attached.
- the first spring 10 can be held by means of a schematically illustrated holding member 15 in a cocked position.
- the holding member is presently designed as a spring button, in which a perpendicular to the driving direction movable detent 15a is forcebeauschlagt means of a detent spring 15b.
- a perpendicular to the driving direction movable detent 15a is forcebeauschlagt means of a detent spring 15b.
- Triggering of the first spring 10 is effected by lifting the catch 15a. This can be done by a corresponding mechanism (not shown) by operating a trigger 16 of the tacker, by an electromechanical actuator or otherwise.
- a first tensioning of the first spring 10 must first take place. In the present case this is achieved by pressing the Aufsetzgliedes 7 by the stroke H. Accordingly, an increased force must be applied by the operator for the first setting process or the first spring tension.
- Fig. 3 a non-patch position of the tacker with the tensioned first spring 10 is shown.
- the firing hammer 8 is held together with the spring 10 in a rear position. In this state, the device is usually during its use and between the setting processes.
- the device To trigger a setting process, the device is pressed against a workpiece and the Aufsetzgliedes 7 pushed by the stroke H, so that propellant charge 4 and charge chamber 6 are brought together. This condition is shown in FIG.
- the holding member 15 releases the first spring 10. This accelerates the firing hammer 8 forward in the direction of the igniter 4a until the sleeve 1 1 reaches the stop 12 on the thrust plate 9. The igniter 8 then lays back the last free distance without further acceleration and strikes the igniter 4a. According to the appropriate design of mass and speed of the ignition hammer 8 ignition takes place reliably.
- the piston 2 is accelerated forward and on the other hand, the gas pressure supporting butt 9 against the shock bottom spring 13 moves backwards.
- the spring-loaded detent 15a By passing the spring-loaded detent 15a, the first spring is again put into a tensioned and held state without the operator having to spend any force on this before the subsequent setting process.
- the first spring can be relaxed after completion of the work for storage of the device, for example by a blank shot without propellant charge.
- a further second spring 17 is provided on the ignition hammer 8, which presses the firing hammer 8 as the first spring 10 to the front. This ensures that the primer is permanently held in its forward position even when the first spring is tensioned in the non-attached state of the device. Due to the achievement of the stop 12 before attacking the igniter 8, a faulty release of the first spring would thus do not lead to an acceleration of the firing hammer or any other action on the propellant charge 4.
- FIG. 5 shows the second embodiment with unstressed first spring 10 in a non-attached state.
- FIG. 6 shows the unassembled state when the first spring 10 is tensioned, ie the typical state of use between two setting processes.
- the second spring 17 is disposed concentrically within the first spring 10 and has a significantly smaller spring constant. As a result, it represents a negligible resistance to the operator when placing the device. A contribution of the second spring 12 to accelerate the ignition hammer 8 is correspondingly insignificant, so that the second spring 17 only serves to position the ignition hammer for safety reasons.
- the holding member 15 releases the first spring 10 as in the first example.
- the second spring 17 is released at the same time, so that the ignition hammer 8 is accelerated by the springs 10, 17 to the front.
- the acceleration by the first spring 10 and the second spring 17 ends at the stop 12.
- the igniter is not subject to acceleration. Rather, he moves on only because of his inertia.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15202290.1A EP3184256A1 (en) | 2015-12-23 | 2015-12-23 | Pyrotechnic insertion device |
PCT/EP2016/082056 WO2017108877A1 (en) | 2015-12-23 | 2016-12-21 | Pyrotechnic driving tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3393719A1 true EP3393719A1 (en) | 2018-10-31 |
EP3393719B1 EP3393719B1 (en) | 2019-08-28 |
Family
ID=54936935
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15202290.1A Withdrawn EP3184256A1 (en) | 2015-12-23 | 2015-12-23 | Pyrotechnic insertion device |
EP16819544.4A Not-in-force EP3393719B1 (en) | 2015-12-23 | 2016-12-21 | Pyrotechnic insertion device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15202290.1A Withdrawn EP3184256A1 (en) | 2015-12-23 | 2015-12-23 | Pyrotechnic insertion device |
Country Status (3)
Country | Link |
---|---|
US (1) | US20200269402A1 (en) |
EP (2) | EP3184256A1 (en) |
WO (1) | WO2017108877A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1538256A (en) * | 1966-10-03 | 1968-08-30 | Impex Essen Vertrieb | Nail gun |
US4598851A (en) * | 1982-07-02 | 1986-07-08 | Uniset Corporation | Fastener driving tool |
DE4022673A1 (en) * | 1990-07-17 | 1992-01-23 | Hilti Ag | POWDER POWERED SETTING DEVICE |
DE19544105A1 (en) * | 1995-11-27 | 1997-05-28 | Hilti Ag | Bolt setting tool with shock absorber |
DE10251307B4 (en) * | 2002-11-04 | 2014-04-10 | Hilti Aktiengesellschaft | Internal combustion setting device |
DE10253668B4 (en) | 2002-11-19 | 2015-03-05 | Hilti Aktiengesellschaft | Internal combustion setting device |
-
2015
- 2015-12-23 EP EP15202290.1A patent/EP3184256A1/en not_active Withdrawn
-
2016
- 2016-12-21 EP EP16819544.4A patent/EP3393719B1/en not_active Not-in-force
- 2016-12-21 US US16/063,790 patent/US20200269402A1/en not_active Abandoned
- 2016-12-21 WO PCT/EP2016/082056 patent/WO2017108877A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP3393719B1 (en) | 2019-08-28 |
EP3184256A1 (en) | 2017-06-28 |
WO2017108877A1 (en) | 2017-06-29 |
US20200269402A1 (en) | 2020-08-27 |
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