EP0068206B1 - Power-driven electric hand tool - Google Patents

Power-driven electric hand tool Download PDF

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Publication number
EP0068206B1
EP0068206B1 EP19820105053 EP82105053A EP0068206B1 EP 0068206 B1 EP0068206 B1 EP 0068206B1 EP 19820105053 EP19820105053 EP 19820105053 EP 82105053 A EP82105053 A EP 82105053A EP 0068206 B1 EP0068206 B1 EP 0068206B1
Authority
EP
European Patent Office
Prior art keywords
tool
characterized
hand tool
cylinder
bushing
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.)
Expired
Application number
EP19820105053
Other languages
German (de)
French (fr)
Other versions
EP0068206A2 (en
EP0068206A3 (en
Inventor
Ewald Kille
Heinrich Griebel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
J Wagner GmbH
Original Assignee
J Wagner GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE19813125860 priority Critical patent/DE3125860C2/de
Priority to DE3125860 priority
Application filed by J Wagner GmbH filed Critical J Wagner GmbH
Publication of EP0068206A2 publication Critical patent/EP0068206A2/en
Publication of EP0068206A3 publication Critical patent/EP0068206A3/en
Application granted granted Critical
Publication of EP0068206B1 publication Critical patent/EP0068206B1/en
Expired legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25CHAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00Hand-held nailing tools; Nail feeding devices
    • B25C1/06Hand-held nailing tools; Nail feeding devices operated by electric power
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00Chucks or sockets
    • Y10T279/35Miscellaneous

Description

  • The invention relates to an electrically operated manual tool, in particular a nailer, with an oscillating armature motor which can be actuated as a function of the mains frequency and whose oscillating armature, which is pivotably mounted on one side, acts on a part or a tool to be driven.
  • From the document DE-C-287819 a device of this type for regulating the impact strength in electromagnetic impact tools with stroke-limiting actuating stop is known. This striking tool is equipped with a submersible anchor that is pivotally suspended on one side and acts directly on a workpiece against the force of a compression spring. In this embodiment, the impact strength can be regulated within wide limits by adjusting the stop, but an impact body is not provided, so that the power losses are considerable. Furthermore, this device can only be used as a striking tool.
  • US-A-1 699 519 also shows a hand-held tool which has a mechanically operated impact body which is slidably inserted in a sleeve. Due to the force of springs, the impact body and the tool, on which it acts via an intermediate piece designed as a shaft, are returned to the starting position after each impact. In addition to the fact that this unwieldy device, which is large in its axial extension, can only function with a low impact frequency due to the large number of components that can be moved relative to one another, high power losses can also be accepted.
  • It is therefore an object of the invention to provide an electrically operated manual tool of the aforementioned type which is small in size, extraordinarily handy and light and can be used in a very versatile manner. In addition, the aim is to ensure that the energy drawn from the drive motor acts directly on the impact body without the intermediary of intermediate links, for example a transmission, so that the power losses are low, and thus high efficiency is achieved with little effort.
  • According to the invention, this is achieved in that an impact body, following the frequency of the armature, is inserted between the part to be driven or the tool, in a cylinder held in a stationary manner in a housing of the device, that an attachment sleeve can be detachably coupled to the cylinder receives a plunger which is displaceable relative to the striking body and acts on the part to be driven or the tool, and that the striking body is supported against the feed movement of the oscillating armature via a return spring on the cylinder.
  • This configuration makes it possible to build a hand-held tool extremely compactly and easily, since the cylinder provided with the impact body can be arranged directly next to the AC oscillating armature motor, which is known, for example, for driving paint spray guns. And since the armature of the oscillating magnet, which is attracted by the electromagnetic forces and preferably vibrates around an axis at twice the mains frequency, acts directly on the low-mass impact body with its free end, the power losses to be accepted are extremely small. The device can thus be easily held in one hand to drive in a nail or rivet. And since attachment sleeves that can be designed differently can be coupled with the cylinder, since they can be designed for different purposes, they can be used in a variety of ways and the method of operation can be changed quickly.
  • By using an AC oscillating armature motor as the drive member, which is extremely reliable, the device designed according to the invention is not only economical to manufacture, but it is also insensitive to interference and easy to handle, especially when working overhead. And since the striking body is supported by a return spring on the cylinder receiving it against the feed movement of the vibrating armature, contact with the vibrating armature is always ensured, so that the striking body is accelerated not by striking the vibrating armature but by its feed movement and thus reducing the striking noise are.
  • The stroke of the oscillating armature can be adjusted in a simple manner by means of a counter bearing which preferably interacts with its free end and can be inserted adjustably in the housing of the device, for example in the form of a threaded spindle screwed into a nut and provided with a buffer.
  • For coupling the attachment sleeve to the cylinder receiving the impact body, it is appropriate to use one or more clamping pieces in it, which can be displaced radially inward against spring force and into one by means of a rotatably mounted sleeve which overlaps the free end of the cylinder protruding from the housing of the device can be inserted into the annular groove.
  • The clamping pieces are expediently slidable in two grooves machined diametrically opposite one another in the cylinder and held by means of a semi-circularly bent compression spring supported on them, the spring being guided in a groove machined in the cylinder and axially formed on the ends Directed approaches in bores provided in the clamping pieces are supported on these and for actuating the clamping pieces the sleeve overlapping them on the inner lateral surface with the clamping pieces respectively assigned eccentrically running pressure or inclined surfaces should be provided.
  • In the coupling sleeve, which can be coupled to the cylinder, can be used, for example, for nails, rivets or the like. To accommodate parts, a guide bushing which can be displaced relative to the latter against the force of a spring supported on the plunger, the adjustment movement of which is limited by a stop which interacts with the attachment sleeve.
  • To lock the part to be driven in, a ring-shaped permanent magnet can be inserted into the guide bush, and this should also be provided at its free end with a sleeve or the like made of elastically deformable material in order to avoid damage to the workpiece to be machined.
  • According to a different type of design, the plunger can be supported on the attachment sleeve by means of a spring and this can be provided with a laterally projecting magazine for receiving clips, nails or the like, which can be moved axially against the force of a spring in the attachment sleeve and with a receiving channel is provided, into which a tongue connected to the plunger can be inserted, the tongue remaining in the receiving channel while a clip is being driven in.
  • Furthermore, it is possible to support the plunger on the attachment sleeve by means of a spring and to insert a tool, for example a chisel or the like, axially displaceably therein.
  • The attachment sleeve provided with the magazine or the tool can also be inserted into the cylinder in a position-oriented manner, for example by means of a molded polygon, so that an exact assignment is given.
  • In order to facilitate handling, it is also appropriate to provide the housing of the device preferably in the area of the introduction of the electrical connecting line with a suspension device, for example in the form of a molded perforated hook, and to provide the AC oscillating armature motor in the area of the impact body in switch one of the housing shells of the device arranged preferably as a tiltably mounted plate switch on and off.
  • In the drawing, an embodiment of the electrically operated hand-held tool designed according to the invention and some differently designed attachment sleeves are shown and explained in detail below. Show here:
    • 1, the hand tool with a usable for driving nails attachment sleeve, partly in section,
    • 2 shows a section along the line 11-11 of FIG. 1 on an enlarged scale,
    • 3 shows an attachment sleeve which can be coupled to the hand-held tool according to FIG. 1 and is provided with a magazine for holding clips, in axial section,
    • Fig. 4, the attachment sleeve according to Fig. 3 during a work process and
    • 5 and 6 a further attachment sleeve which can be coupled to the hand-held tool according to FIG. 1 and is provided with a tool in different sectional views.
  • The electrically operated manual tool shown in FIG. 1 and designated 1 for driving nails 2 into the wooden parts 3 and 4 essentially consists of an AC oscillating armature motor 12 used in a two-part housing 11 and a cylinder 31 likewise held in the housing 11, in which an impact body 32 is arranged. The stator 13 of the AC oscillating armature motor 12 is provided with a magnetic coil 14 which can be connected to a power supply via a line 18; in addition, the oscillating armature 15 is held on this by means of an angularly bent leaf spring 17, which can be pivoted about the edge designated by 16 by its force and the magnetic field. The individual sheets forming the stator 13 and also the oscillating armature 15 are held together by rivets 19 and 20.
  • The housing 11, which consists of two half-shells, only one of which is shown as 11 ', has a suspension 21 by means of which the device 1 can be easily held on pins or ropes in different ways. In addition, the half-shell 11 'is equipped with fastening eyes 22 into which screws penetrating the other half-shell can be screwed. Furthermore, a tiltable plate 27 is inserted into the half-shell 11 'in the area of the impact body 32, by means of which a switch (not visible) can be actuated, by means of which the lines 29 and 30 leading to the AC oscillating armature motor 12 can be connected to one another. In operation, the circuit is thus closed via lines 29, 30 and 30 ', lines 29 and 30' being connected to power supply line 18 by means of a clamp 28.
  • In order to be able to adjust the stroke of the oscillating armature 15, a nut 23 is inserted into the housing half-shell 11 ', into which a threaded spindle 24 is screwed. And this is equipped with a rubber buffer 26 against which the rocker armature 15 is pressed by the force of a return spring 33. With the help of a screwdriver or similar Tool that can be inserted into a slot 25 machined into the threaded spindle 24 can be rotated slightly and thus the stroke of the oscillating armature 15 can be changed.
  • In the embodiment according to FIG. 1, an attachment sleeve 41, in which a plunger 43 and a guide bushing 44 are guided, is connected to the stationary cylinder 31, in which the striking body 32 which can be actuated by the oscillating armature 15 is displaceable counter to the force of the return spring 33 are. The guide bush 44 is slidably inserted in the facing sleeve 41, against the force of a spring 45, which is supported on the plunger 43. The adjustment path of the guide bush 44 which receives the nail 2 to be driven is limited by means of a stop ring 46. It is also on the free end of which is fitted with a sleeve 48 in order to avoid damage to the wooden part 4 when the device 1 is placed on it. And in order to hold the nail 2 in the guide bush 44 in a simple manner, this is provided with an annular permanent magnet 47.
  • To connect the attachment sleeve 41 to the cylinder 31, as can be seen in particular in FIG. 2, diametrically arranged clamping pieces 35 are used, which are radially displaceable in grooves 34 machined into the cylinder 31, against the force of a semicircularly curved spring 38 , which engages with its angled ends 38 'provided in the clamping pieces 35 bores 40. In addition, the spring 38 is guided in a groove 39 of the cylinder 31.
  • For the radial displacement of the clamping pieces 35, a sleeve 36 is provided which is rotatably arranged on the free end of the cylinder 31 and which is equipped with eccentric pressure surfaces 37. If the sleeve 36 is rotated counterclockwise in the illustration according to FIG. 2, the clamping pieces 35 are displaced inward against the force of the spring 38 by the pressure surfaces 37 attached to the sleeve 36, so that they are inserted into an annular groove machined into the attachment sleeve 44 42 intervene. In this way, since the clamping pieces 35 are pressed against the cylinder 31, the attachment sleeve 41 is firmly connected to the latter. Nevertheless, this connection is easily detachable; all that needs to be done is to turn the sleeve 36 clockwise. Because of the force of the spring 38, the clamping pieces 35 are in turn pressed outwards as soon as there is a corresponding free space.
  • If, as shown in FIG. 1, a nail 2 is inserted into the guide bushing 44 and the AC oscillating armature motor 12 is switched on, the oscillating armature 15 is moved towards the stator 13 by the magnetic field that builds up at twice the mains frequency. The attraction force exerted on the rocker armature 15 is transmitted to the striking body 32, which acts on the plunger 43, through which the nail 2 is also driven into the wooden parts 3 and 4. The device 1 is thus immediately ready for operation, also no large masses need to be accelerated, the driving force of the AC oscillating armature motor 12 is rather transmitted directly to the nail 2 to be driven.
  • According to FIGS. 3 and 4, a plunger 53 is inserted into the attachment sleeve 51, designated 51 with an annular groove 52 for receiving the clamping pieces 35, and this is equipped with a magazine 56 for receiving clips, which is connected to the plunger 53 by means of a Tongue 54 can be driven. The plunger 53 is supported on the attachment sleeve 51 by means of a spring 55, and the magazine 56 is also supported on this by means of a spring 57.
  • For the non-rotatable mounting of the magazine 56 on the attachment sleeve 51, the latter is equipped with a slot 60 into which a screw 61 protruding from the magazine 56 engages. In addition, a polygon 59 is attached to the attachment sleeve 51, which interacts with a polygon formed in the cylinder 31. In this way, the magazine 56 can be inserted into the device 1 in an aligned manner.
  • The staples stored in the magazine 56, as shown in FIG. 1, are successively inserted into a channel 58 by means of a slide 62 and driven in by means of the tongue 54. As long as the tongue 54 (FIG. 4) is in the channel 58, it is impossible for a clamp to be pushed in.
  • The attachment sleeve 71 shown in FIGS. 5 and 6, provided in the same way with an annular groove 72 and a polygon 79 for position-oriented attachment to the cylinder 31 of the device 1, receives a tool 75 designed as a chisel. The blade 76 of the tool 75, which engages in a slot 78 of the attachment sleeve 71, is provided with a bolt 77 which is inserted into a push rod 73. The plunger 73, on which the striking body 32 acts, is supported on the attachment sleeve 71 by means of a spring 74.
  • If the attachment sleeve 71 is inserted into the cylinder 31, the tool 75, since it is driven by the impact body 32 acted upon by the oscillating armature 15 and is pressed back into the starting position by the spring 74, can be carried out in a simple manner.

Claims (14)

1. Power driven electric hand tool, particularly nailing device, with a power line frequency driven swinging lever motor, the swinging lever of which is acting on a part to be nailed or on a tool, characterized in that between the part (2) to be nailed or the tool (74) respectively an impact body (32), actuated with the power line frequency is inserted into a cylinder (31) stationary held in a housing (11) of the tool (1), that with the cylinder (31) an adapter bush (41; 51; 71) may be detachably coupled, taking over a plunger (43; 53; 73) engaging the nailing part (2) or the tool (74) and shiftable by means of the impact body (32) against the bush, and that the impact body (32) is biased to the cylinder (31) by means of a reset spring (33) in counter direction of the feed motion of the swinging lever (15).
2. Hand tool of claim 1, characterized in that the stroke of the swinging lever (15) is adaptable by means of a counter stop (23, 24, 26) being adjustable in the housing (11) of the tool (1) and co-operating with the free end of the swinging lever, for example in the shape of a threaded spindle (24) screwed into a nut (23) and having a buffer (26).
3. Hand tool of claim 1 or 2, characterized in that in order to couple the adapter bush (41; 51; 71) to the cylinder (31) incorporating the impact body (32) into the cylinder one or more clamping parts (35) are inserted, which by means of a turnable bushing (36) are shiftable towards the inner side against the power of a spring and further shiftable into a ring groove (42; 52; 72) in the adapter bush (41; 51; 71), which bushing (36) covers the free end of the cylinder (31) extending out from the housing (11) of the tool.
4. Hand tool of claim 3, characterized in that the clamping parts (35) are shiftably guided in two grooves (34) located diametrically opposed located in the cylinder (31) and which clamping parts are held by a pressure spring (8) biased to the grooves and semicircularly bowed.
5. Hand tool of claim 4, characterized in that the spring (38) is guided in a groove (39) in the cylinder (31) and is biased with endwise axially directed extensions (38') by means of bores (40) in the clamping parts (35).
6. Hand tool of one or more of the claims 3 through 5, characterized in that for the handling of the clamping parts (35) the bushing (36) covering the clamping parts (35) at its inner side of the surface is provided with excentrical pressure or inclined surfaces (37).
7. Hand tool of one or more of the claims 1 through 6, characterized in that in the adapter bush (41) which may be coupled with the cylinder (31) a guide bushing (44) is inserted shiftable against the adapter bush towards the power of a spring (45) biased to the plunger (43), the guide bushing is provided to take over the part (2) to be nailed, whereby the motion of the guide bushing is limited by a stop (46) co-operating with the adapter bush (41).
8. Hand tool of claim 7, characterized in that into the guide bushing (44) a permanent ring magnet (47) is inserted to lock the part (2) to be nailed.
9. Hand tool of claim 7 or 8, characterized in that the guide bushing (44) at its free end is provided with a collar (48) or the like made from resilient material.
10. Hand tool of one or more of the claims 1 through 6, characterized in that the plunger (53) is biased at the adapter bushing (51) by means of a spring (55) and that the adapter bushing has a lateral magazine (56) for clamps, nails or the like, which magazine against the power of the spring (57) in the adapter bushing (51) is axially shiftable and has a channel (58), into which a tongue may be inserted connected to the plunger (53), and that the tongue (54) remains in the channel (58) when nailing a clamp.
11. Hand tool of one or more of the claims 1 through 7, characterized in that the plunger (73) is biased to the adapter bushing (71) by means of a spring (74), and that in the adapter bushing a tool (75), for example a chisel or the like is shiftably inserted.
12. Hand tool of claim 10 or 11, characterized in that the adapter bushing (51; 71) with the magazine (56) or the tool (75) may be inserted into the cylinder (31) in a certain orientation, for example by means of a square (59; 79) attached thereto.
13. Hand tool of one or more of the claims 1 through 12, characterized in that the housing (11) of the tool (1) preferably where the electric line (18) comes into the housing is provided with a hanger (21) like a hook formed thereto having a hole.
14. Hand tool of one or more of the claims 1 through 13, characterized in that the alternating current swinging lever motor (12) is switchable on or off by means of a switch preferably designed as a toggle plate (27) located in one of the housing parts (11) of the tool in the area of the impact body (32).
EP19820105053 1981-07-01 1982-06-09 Power-driven electric hand tool Expired EP0068206B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19813125860 DE3125860C2 (en) 1981-07-01 1981-07-01
DE3125860 1981-07-01

Publications (3)

Publication Number Publication Date
EP0068206A2 EP0068206A2 (en) 1983-01-05
EP0068206A3 EP0068206A3 (en) 1983-10-12
EP0068206B1 true EP0068206B1 (en) 1987-04-01

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ID=6135804

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820105053 Expired EP0068206B1 (en) 1981-07-01 1982-06-09 Power-driven electric hand tool

Country Status (8)

Country Link
US (1) US4511074A (en)
EP (1) EP0068206B1 (en)
JP (1) JPS5810469A (en)
KR (1) KR860000208B1 (en)
AU (1) AU8513782A (en)
BR (1) BR8203827A (en)
DE (1) DE3125860C2 (en)
IN (1) IN156016B (en)

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Also Published As

Publication number Publication date
EP0068206A2 (en) 1983-01-05
KR860000208B1 (en) 1986-03-15
AU8513782A (en) 1983-01-06
US4511074A (en) 1985-04-16
EP0068206A3 (en) 1983-10-12
DE3125860A1 (en) 1983-01-27
BR8203827A (en) 1983-06-28
DE3125860C2 (en) 1983-12-15
IN156016B (en) 1985-04-27
JPS5810469A (en) 1983-01-21
KR840000333A (en) 1984-02-18

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