EP2177321A1 - Manually operated fastening device - Google Patents

Abstract

The driver (10) has a driving tappet (14) movably mounted in a tappet guide. A tensioner has a tensioning element (76) provided with a profile. The tensioning element moves along a longitudinal axis of motion (A) using a rotatable counter-element engaged with the profile. Guide sections (78, 79) allow the tensioning element to swivel around longitudinal axis of the motion. A locking mechanism (50) is shifted into a release position by swiveling movement of the tensioning element. The tensioning element has a radially protruding guide element (81b) that interacts with the guide sections.

Description

The present invention relates to a hand-held tacker referred to in the preamble of claim 1. Art Such hand-held tackers have a displaceably guided Eintreibstössel about the fasteners are driven into a workpiece.

The tackers are z. B. electrically operated, wherein at least one drive spring serves as an energy storage for the drive ram, which is tensioned via an electrically operated clamping mechanism. An advantage of such Eintreibgeräte is their simple and inexpensive to manufacture structure.

A designed as an electronic nailer tackler is from the US 3,810,572 known. This tacker has a drive-in ram, which comprises a shaft section facing away from the drive-in direction and provided with a thread, and a ram section lying in the drive-in direction. The shaft portion carrying the thread is partially guided axially within a drive spring element. A radially outwardly disposed about the rotatably guided drive ram sleeve is rotatably movable via a drive motor, wherein in the sleeve running balls engage in the thread of the threaded portion to move the drive ram axially against the drive spring element and to tension this. To trigger a driving operation, a first locking sleeve is provided, which is displaceably guided outside on the sleeve and which can be displaced axially via the trigger in order to release locking balls radially outwards. Another locking sleeve, which is guided on the outside of the first locking sleeve controls the radial disengagement of the balls engaging in the thread. After triggering a driving operation of the driving ram is moved with its plunger portion and its shaft portion on the drive spring element in the driving direction.

The disadvantage of this tacker is, on the one hand, that the three sleeves are structurally very complex and make the tacker more expensive. On the other hand, when the tacker is triggered, the entire force of the drive spring is applied to a very small area at the edge of the thread, where the last blocking ball comes out. This creates the risk of edge breakage of the thread.

From the DE 32 37 087 A1 is known as an electric stapler tacker known. In this Eintreibgerät designed as a firing pin drive ram is moved by a rotating electric motor against a drive spring in a clamping position. At Eintreibstössel a toothing is provided, which can be brought into engagement with a driven via the electric motor threaded spindle. In a tensioned end position of the drive spring, the threaded spindle pivots out of engagement with the teeth on the drive ram. In this clamping position of the driving ram can be locked by a locking member. In order to trigger a driving operation, a trigger switch, such as a release lever or a push button must be actuated, over which the locking member is released from its locked position on the drive ram. The retractable with the electrotacker fasteners can, for. B. be stored in a magazine.

The disadvantage of this tacker is that the construction with a controlled swing-spindle is quite expensive and expensive. In addition, a swing-out spindle builds bigger and heavier, which is a big disadvantage for a hand-held tacker.

The object of the present invention is to develop a tacker of the aforementioned type, which avoids the aforementioned disadvantages and has a simple structure.

This object is achieved according to the invention by the measures mentioned in claim 1. Accordingly, guide means for the clamping element are provided, which have a first guide portion for rotationally fixed guidance of the clamping element along the longitudinal movement axis and the at least one pivoting of the clamping element about the longitudinal movement axis allowing further guide portion, wherein the locking device can be transferred via a pivoting movement of the clamping element in the release position. Since according to the invention, the clamping element can now be used in addition to its clamping function for unlocking the locking device, can be dispensed with further components for transferring the locking device in the release position and the construction or the device structure are significantly simplified. Further Now the locking device can be operated via the motor of the clamping device, so that no additional auxiliary drive is needed.

Advantageously, a release switch is provided, via which the pivoting movement of the clamping element for transferring the locking device can be initiated in the release position, whereby a work with the tacker can be done in the usual way and can be dispensed with additional switching elements.

It is also advantageous if the further guide portion has a stop which limits the pivoting of the clamping element about the longitudinal movement axis to a maximum pivoting angle in the range of 30 ° to 100 °, whereby the use of a switch is enabled, the achievement of the final position of the Can detect clamping element. Furthermore, by pivoting the clamping operation at a defined angle of 30 ° to 100 ° at the same time a pivot angle for pivoting the clamping element defined in the opposite direction, which is sufficient to achieve the transfer of the locking device in the release position during the triggering operation of the Eintreibgeräts. The stop also ensures that the clamping element always remains in a defined rotational position, so that the pivoting angle required for triggering is also precisely defined. This allows a simple and robust control of the tripping process.

In a structurally favorable solution at least one radially projecting guide element is provided on the clamping element, which cooperates with the guide sections. Advantageously, exactly two radially opposite and provided with guide rollers guide elements are provided, whereby an optimal guidance of the clamping element is achieved. By the guide rollers, the friction during the release process can also be reduced. Due to the two radially opposite guide elements, a uniform symmetrical distribution of the tensile forces is further achieved and thus reduces the acting loads. The components can therefore be dimensioned smaller.

Advantageously, a coupling and locking part of the locking device is arranged at a first end of the clamping element, which can be brought into engagement with a counter-coupling part of the drive-in ram. Furthermore, the at least one guide element is provided at a second end of the clamping element. As a result, a good space utilization is achieved, which allows a small building tacker.

It is also advantageous if a switchable over the release switch freewheel is provided between the coupling and locking part and the clamping element, thereby allowing not every pivoting movement in the switching direction of the locking device to an operation and thus to a transfer of the locking device in the release position leads. Thus, the drive spring element can also be relaxed when the drive ram is still coupled to the clamping element by the clamping element is slowly moved back to its original position (eg, when the tacker in the tensioned state of the drive spring is not triggered for a long time).

In a technically easy to implement variant of the freewheel is advantageously designed as a wrap spring clutch.

In an easy to manufacture and technically reliable design, the clamping element is formed as provided with a profiling in the form of a thread round rod, which passes through the designed as a counter-nut and provided with a thread of the clamping element complementary internal threaded rotatable counter-element.

A torque-free drive and clamping system is achieved when the clamping element is arranged coaxially to the driving ram. Advantageously, additionally or alternatively, the clamping element can be arranged coaxially with the at least one drive spring element in order to keep the drive and clamping system torque-free.

In the drawings, the invention is shown in one embodiment.

Fig. 1

ein erfindungsgemässes Eintreibgerät in der Ausgangsstellung,

Fig. 2

das Eintreibgerät aus Fig. 1 in einer für einen Eintreibvorgang bereiten Stellung,

Fig. 3

einen Schnitt entlang der Linie III - III aus Fig. 2,

Fig. 4

ein Detail des Eintreibgeräts gemäss der Markierung IV aus Fig. 2,

Fig. 5

einen Schnitt entlang der Linie V - V aus Fig. 4,

Fig. 6

das Eintreibgerät aus Fig. 1 nach dem Auslösen eines Eintreibvorgangs,

Fig. 7

ein Detail des Eintreibgeräts gemäss der Markierung VII aus Fig. 6,

Fig. 8

einen Schnitt entlang der Linie VIII - VIII aus Fig. 7,

Show it:

Fig. 1

an inventive tacking device in the starting position,

Fig. 2

the tacker off Fig. 1 in a ready for a driving operation position

Fig. 3

a section along the line III - III off Fig. 2 .

Fig. 4

a detail of the tacker according to the marking IV Fig. 2 .

Fig. 5

a section along the line V - V out Fig. 4 .

Fig. 6

the tacker off Fig. 1 after the triggering of a drive-in process,

Fig. 7

a detail of the tacker according to the mark VII Fig. 6 .

Fig. 8

a section along the line VIII - VIII from Fig. 7 .

That in the FIGS. 1 to 8 shown hand-held tacker 10 is electrically operated and has a housing 11 and disposed therein, a total of 30 designated drive arrangement for a drive-in ram 13 which guided in a guide 12 displaceable (see, in particular FIGS. 1 . 2 and 6 ). The drive assembly 30 includes a drive spring member 31 which is supported at one end to a support point 32 on the housing 11 and which engages with another end on the drive tappet 13. Instead of only one drive spring element could also z. B. be provided two drive spring elements, for. B. as in the DE 10 2007 000 226 A1 shown. There, the two drive spring elements are coupled to each other via a transmission device, which is coupled on the output side with the drive-in ram. The transmission device may have a translation between input movement and output movement of the drive spring elements, for. B. with a transmission ratio of about 1: 4, which is achieved with a given expansion path of the drive spring elements, a 4 times as long stroke of the drive-in ram.

At the end of the guide 12 located in the drive-in direction 27, a mouth part 15 with a driving-in channel 16 extending coaxially to the guide 12 adjoins the fastening elements 60. At the side of the mouth part 15 abragend a fastener magazine 61 is arranged, can be stored in the fasteners 60.

The tacker 10 further includes a handle 20 on which a trigger switch 19 is arranged to trigger a driving operation with the tacker 10. In the handle 20 is also still a total designated 21 power supply arranged, via which the tacker 10 is supplied with electrical energy. In the present case, the power supply 21 includes at least one accumulator. The power supply 21 is connected via electrical supply lines 24 both to an electrical control unit 23 and to the release switch 19. The trigger switch 19 is further connected via a switch line 85 to the control unit 23.

At the mouth portion 15 of the tacker 10 designed as Anpressfühler contact pressure element 14 of a safety device 25 is arranged, via which an electrical pressure switch 29 of the safety device 25 is actuated, which is electrically connected via a switching means 28 to the control unit 23. The electrical pressure switch 29 sends an electrical signal to the control unit 23 as soon as the tacker 10 is pressed with a mouth 18 of the mouth part 15 to a workpiece U, as from Fig. 2 can be seen, thus ensuring that the tacker 10 can be triggered only when it has been properly pressed against a workpiece U. For this purpose, the contact pressure element 14 is displaceable along a longitudinal movement axis A defined by the drive-in channel 16 or by the movement path of the drive-in ram 13 and between an initial position 36 (see FIG Fig. 1 ) and a pressing position 37 (see Fig. 2 and 6 ) displaceable. The pressing member 14 is z. B. acted upon by a not visible in the figures spring element in the direction of its initial position elastically.

Furthermore, a tensioning device for the drive spring element 31, designated overall by 70, is arranged on the tacker 10. This clamping device 70 comprises an electrically operated motor 71 via which an axially movably mounted clamping element 76 by means of a rotatably mounted counter-element 75 is axially displaceable. The clamping element 76 is z. B. as formed with a profiling in the form of an external thread round rod. The counter-element 75 is rotatably mounted on at least one bearing 77 and z. B. formed as a counter nut which is provided with an internal thread which is complementary to the external thread on the clamping element 76 and is engaged with this. The motor 71 is electrically connected to the control unit 23 via a second control line 74 and can be put into operation via this, z. B. when the Anpressschalter 29 is actuated via the contact pressure element 14 or already after successful Eintreibvorgang when the tacker 10 is lifted from a workpiece U again. The motor 71 is connected so that it can be operated in both possible directions of rotation. On an output shaft of the motor 71 sits a driven gear 72, which is provided with the counter element 75 via a transmission element 73 to enable the counter element 75 in the operation of the motor 71 in a rotational movement. The transmission element 73 is z. B. as belt, timing belt, chain, propeller shaft, push rod or gear. The motor 71 is arranged with its output shaft axis parallel to the axis of rotation of the counter element 75 and parallel to the longitudinal axis of movement A.

In the region of the housing 11 facing away from the mouth part 15, guide means for the clamping element 76 are provided, which comprise a first guide section 78 for the rotationally fixed guidance of the clamping element 76 along the longitudinal movement axis A and the at least one further guide section allowing the clamping element 76 to pivot about the longitudinal movement axis A. 79 have. The guide portions 78, 79 are z. B. on a housing-fixed guide sleeve 88 for the clamping element 76, wherein the guide portion 78 extends axially and parallel to the longitudinal axis of movement A, while the further guide portion 79 is arranged on the front side of the guide sleeve and is oriented transversely to the longitudinal axis of movement A - ie in the circumferential direction to the longitudinal axis of movement A. or to the clamping element 76. At least one stop 80 is provided on the further guide section 79, which limits the pivoting of the clamping element 76 about the longitudinal movement axis A to a maximum pivoting angle in the range of 30 ° to 100 °, preferably 90 °. The clamping element 76 has at a mouth portion 15 facing the axial first end 83 on a coupling and locking part 51 of a total of 50 designated locking device, which is engageable with a mating coupling part 17 of the driving ram 13 in engagement. In the FIGS. 1 . 2 . 4 and 7 the coupling and locking member 51 is shown in its coupled position 54 a, in which it is engaged with the counter-coupling part 17. The coupling and locking part 51 has a receptacle 53, projecting into the formed as balls coupling body 52. These coupling body 52 move in the coupling case in guideways 22 on the mating coupling part 17, where they can get caught in the manner of a bayonet lock (see in particular FIGS. 4 and 7 ). At its axial second end 84, the clamping element 76 at least one, in the illustrated embodiment exactly two guide elements 81 a, 81 b, which protrude laterally or radially from the clamping element 76 and in the in Fig. 1 shown position of the clamping element 76 in the guide portion 78 are. The guide elements 81 a, 81 b each carry guide rollers 82, which can roll on the guide surfaces of the guide portions 78, 79.

Functionally, the locking device 50, in addition to the coupling and locking part 51 and the counter-coupling part 17, are also assigned the guide elements 81a, 81b and the further guide section 79. The guide elements 81a, 81b lie in one of the Figures 2 and 3 apparent axial blocking position 54b on the stop 80 on the other guide portion 79 and thereby prevent the clamping element under the action of the drive spring 31 moves again in the setting direction 27. Are both the coupling and locking member 51 with the mating coupling member 17 in the coupled position 54a and the guide elements 81 a, 81 b on the stop 80 on the other guide portion 79 in its Axialsperrstellung 54b, then the locking device 50 is in their off Fig. 2 apparent blocking position in which the drive-in ram 13 is held in its eintreibbereiten position (see Fig. 2 ).

Between the coupling and locking part 51 and the clamping element 76 is in the FIGS. 4 and 7 arranged in detail freewheel 57, which is designed as a wrap spring clutch. The freewheel 57 has a trained as a switching ring, axially displaceably mounted switching element 58, a switching sleeve 59 with a switching flag 59a and a wrap spring 56 which is disposed within the switching sleeve 59 and the both end of the coupling and locking member 51 and an end of the clamping element 76 engages. On the inner circumference of the switching element 58 switching teeth 58a are arranged at regular intervals, in the interdental spaces, the switching flag 59a can engage (see Figures 5 and 8th ). The switching element 58 is coupled via a switching strand 39 with the trigger switch 19 and can be actuated via this, as will be described in more detail below.

In Fig. 1 the tacker 10 is shown in its initial position in which the drive spring element 31 is in its relaxed position 34. The clamping element 76 is coupled via the coupling and locking part 51 and the mating coupling part 17 with the driving ram.
If the tacker 10 is pressed with its mouth 18 to a workpiece U, as from Fig. 2 it can be seen, then the control unit 23 is first set to settling readiness via the contact pressure element 14 and the electrical contact pressure switch 29 and a switching command to the motor 71 is given, via the output gear 72 and the transmission element 73, the counter element 75 in a rotation in the direction of rotation of the first arrow 90 offset. Due to the rotation of the counter element 75, the clamping element 76, which is rotatably held on the guide elements 81 a, 81 b in the first guide portion 78 of the guide sleeve 88, axially offset against the driving direction 27. As soon as the clamping element 76 with its guide elements 81a, 81b emerges from the first guide section 78 and reaches the further guide section 79, the clamping element 76 is pivoted due to the rotation of the counter element 17 at an angle of 90 ° in the direction of rotation of the first arrow 90 or rotated until the guide elements 81 a, 81 b accumulate on the stops 80, as in the Figures 2 and 3 is shown. Via a switch, which is not visible in the figures, the motor 71, mediated by the control unit 23, is switched off when the guide elements 81a, 81b are applied to the stops 80. The drive spring element 31 is now in its cocked position 33, in which the tacker 10 is ready for a drive-in.

During the rotational movement of the mating member 75, the coupling and locking member 51 was on the freewheel 57 of the tensioning element 76 rotatably coupled, so that the coupling and locking member 51, the 90 ° pivotal movement of the clamping element 76 is not performed, since the freewheel 57 in this direction of rotation no Torque transfers.

The freewheel 57 is designed to be switchable, ie it can be switched off via the switching element 58. Due to the switchability of the freewheel, the drive spring element 31 can be transferred via a relaxation function of the tacker 10 without actuation of the trigger switch 19 from its cocked position 33 in its relaxed position 34 by z. B. during prolonged break, the control unit 23, the motor 71 in an opposite rotational movement switches, the counter element 75 in a rotation in the direction of the second arrow 91 (see Fig. 1 ), whereby the clamping element 76 is pivoted back again by 90 ° and the guide elements 81 a, 81 b retract again into the first guide section 78. The tensioning element 76 is then offset with relaxation of the drive spring 31 in the setting direction 27, without a driving operation is triggered.

In Fig. 4 is the freewheel 57 in its off position, in which the freewheel 57 transmits torque in both possible directions of rotation.

In Fig. 6 was the trigger switch 19 is actuated, whereby the switching element 39, the switching element 58 was axially offset against the setting direction 27 and the switching flag 59a of the switching sleeve 59 of the freewheel 57 released (see FIGS. 7 and 8 ). The freewheel 57 was thereby turned on, so that it can transmit a torque of the clamping element 76 to the coupling and locking part 51 in the direction of rotation of the arrow 91.

Via the trigger switch 19, an electrical switching signal was further transmitted to the control unit 23, which switched the motor 71 in an opposite rotational movement, the counter element 75 in a rotation in the direction of the second arrow 91 (see Fig. 6 ) offset. As a result, the clamping element 76 was pivoted back again by 90 ° and the guide elements 81 a, 81 b could retract again into the first guide portion 78 and were in their off Fig. 6 apparent unlocking position 55b transferred. This 90 ° rotation has now been performed due to the switched freewheel 57 and the coupling and locking part 51, whereby the coupling body 52 (see Fig. 7 ) could extend out of the guideways 22. The coupling and locking part 51 was thereby transferred to its release position 55 a, in which it is decoupled from the counter-coupling part 17. The driving ram 13 was then moved over the relaxing drive spring element 31 in the setting direction 27 to drive a fastener 60 in the workpiece U.

By means of a pivoting movement of the tensioning element 76, therefore, the locking device 50 was transferred into the release position, in that the coupling and locking part 51 was transferred into its release position 55a and the guide elements 81a, 81b into its unlocked position 55b.

After pressing the trigger switch 19, the clamping element 76 is moved as long as setting direction 27 until the coupling and locking member 51 engages again with the mating coupling member 17. The tensioning element 76 then takes off again Fig. 1 apparent position in which a re-tensioning of the drive spring element 31 can be initiated by the pressing of the tacker 10 to a workpiece U, as previously described.

Claims (11)

Hand-operated driving tool for fastening elements (60), with a drive rod (13) displaceably mounted in a slide guide (12) and drivable via at least one drive spring element (31), with a tensioning device (70) for the drive spring element (31) and with a locking device (50 ), in the blocking position of the drive spring element (31) in its clamping position (33) can be locked, wherein the clamping device (70) has a profiling provided with a clamping element (76), which via a standing with the profiling engaging, rotationsbewegliches and a Motor (71) drivable counter element (75) along a longitudinal axis of movement (A) is axially displaceable,
characterized,
in that guide means are provided for the tensioning element (76), which permit a first guide section (78) for the rotationally fixed guidance of the tensioning element (76) along the longitudinal movement axis (A) and the at least one pivoting of the tensioning element (76) about the longitudinal movement axis (A) further guide portion (79), wherein the locking device (50) via a pivoting movement of the clamping element (76) can be converted into the release position. A tacker according to claim 1, characterized in that a release switch (19) is provided, via which the pivoting movement of the clamping element (76) for transferring the locking device (50) into the release position can be initiated. A tacker according to claim 1 or 2, characterized in that the further guide portion (79) has a stop (80), the pivoting of the clamping element (76) about the longitudinal axis of movement (A) to a maximum pivot angle in the range of 30 ° to 100 ° limited. A tacker according to any one of claims 1 to 3, characterized in that on the clamping element (76) at least one radially projecting guide element (81 a, 81 b) is provided, which cooperates with the guide portions (78, 79). A tacker according to any one of claims 1 to 4, characterized in that two radially opposite and with guide rollers (82) provided guide elements (81 a, 81 b) are provided. A tacker according to any one of claims 1 to 5, characterized in that at a first end (83) of the clamping element (76) has a coupling and locking part (51) of the locking device (50) is arranged, which with a mating coupling part (17) of the driving ram (13) is engageable, and at a second end (84) of the clamping element (76) the at least one guide element (81 a, 81 b) is provided. A tacker according to any one of claims 1 to 6, characterized in that on the release switch (19) switchable freewheel (57) between the coupling and locking part (51) and the clamping element (76) is provided. A tacker according to claim 7, characterized in that the freewheel (57) is designed as a wrap spring clutch. A tacker according to any one of claims 1 to 8, characterized in that the clamping element (76) is formed as provided with a profiling in the form of a thread round rod, which designed as a counter nut and provided with a to the thread of the clamping element (76) complementary internal thread rotationsbewegliche Counter element (75) interspersed. A tacker according to any one of claims 1 to 9, characterized in that the clamping element (76) is arranged coaxially to the driving ram (13). A tacker according to any one of claims 1 to 10, characterized in that the clamping element (76) is arranged coaxially to the at least one drive spring element (31).

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