DE2226788C2 - Nailer with a driving ram driven by the armature of an electromagnet - Google Patents

Description

The main patent concerns: a nailer driven by the armature of an electromagnet Driving ram. This nailer is characterized in that the working winding of the electromagnet during the one nail or the like. Driving stroke of the nailer over a working stroke The triggering changeover switch is connected to the discharge circuit of a capacitor that is used when charging is separated from the working winding and connected to an alternating current network.

With these nailers, the weight must be as low as possible to allow easy handling. As a result, the nailer housing is made of thin-walled light metal or plastic and is therefore heavily stressed by the impact and recoil occurring with each working stroke.

The invention is based on the object that

Nailer housing for the nailer of the initially described

type of mechanical stress

largely to protect so that the housing wall

dung can be particularly easy and the

Handling of the nailer is thereby improved.

According to the invention, the magnet system is in

j ο arranged in a frame that is part of the Naglergehäuses is enclosed and this relieved of the mechanical forces of the magnet system. The considerable as a result of the use of the capacitor Impact forces of the discharge current

Magnets excited by the capacitor are therefore taken up by this frame, which is preferably made of ferromagnetic material, especially strong sheet iron, and the magnetic circuit closes. The working winding of the electromagnet between two inserted in the frame is useful Arranged cross pieces that form a guide for the anchor. On the upper cross piece a cover plate that absorbs the recoil of the anchor can be attached, which enables the transmission of the

mechanisehen occurring during the recoil of the anchor Forces on the nailer housing prevented.

A further weight saving of the portable nailer can be achieved within the meaning of the invention if the working winding of the electromagnet is made of aluminum. An aluminum foil is particularly suitable for this, the individual layers of which are insulated from one another by an oxide layer. Such an aluminum oxide layer can ^{withstand extremely high temperatures of up to about 1500 °} C. without damage, so that the working winding remains operational even in the event of severe overload. In some cases it can also be useful to manufacture the working winding from enamelled aluminum wire, which also enables weight savings of up to about two thirds of the spool weight of the working winding.

In one embodiment of the main patent, the armature of the electromagnet is designed as a plunger armature and is in force-transmitting connection with a pin forming its extension a lever mounted at its rear end on an axis of the nailer housing, the front of which End is coupled to the driving ram. So that this pin does not act against the magnet armature Can produce force, according to a further feature of the invention, this pin is an anti-magnetic one Material made, for example from a nickel-manganese steel. It is recommended that the to provide the end of this pin lying on the lever with a hardened insert to prevent wear largely to prevent.

An embodiment of the subject matter of the invention is illustrated in the drawing. "It shows
F i g. 1 shows the longitudinal section of an electromagnetic nailer designed as a hand-held device and

F i g. FIG. 2 shows a partial cross-section in the plane H-II of FIG. 1.

The basic structure of the nailer corresponds to the embodiment of the main patent. The working winding 11 is connected with its one end via a line 12 to the fixed contact 13 of a changeover switch 14, the counter contact 15 via a diode 16 and a charging resistor 17 as well

one line 18 is connected to a pole 19 of a single-phase alternating current network 20. The other End of working winding 11 is with. the other pole 21 of the alternating current network via a line 22 connected to which the negative pole of a capacitor 23 is connected, the positive pole of which is connected to the Mittelkoniakt 24 of the switch 14 connected is. The capacitor consists of an electrolytic capacitor, such as that used to operate photo flash lamps is common. In parallel with the capacitor 23 there is an »o Quenching resistor 25, which discharges the capacitor 23 when it is disconnected from the network 20.

The nailer housing 26 is made of plastic and encloses with its rear part, designed as a handle 27, the changeover switch 14 with its contacts 13, 15 and its movable central contact 24 as well as the diode 16, the lines 12, 18, 22 and a detection line 28. These lines are combined into a cable 29 and lead to sheet iron ^^ - J ^^ TeiMOIEfKgSrvon the front pnsrnat see leu * _des

housing 26 is unlocked

41 Zschgj »« « £ ^

housing

Frame 41 is em between

The Arbeitssw ™ |

tion of an insulating Hu He

stuck 42 and the ^ rsttK

he

« £ , ^ _is

? Intermediate shell

_{f the intermediate} «a ι« α

43 and κ

^ ^ ^^ S denAnker 31 stuck 43> ««!? F " ^h ™" ^f " ^r " bere cross piece 45 as a long-lasting pin 32 ^^^^^ u / geSdet. In the leadership for the armature ^ l ^ _{enstückes 46} cross stucco 45 is by means of a g £? 48 fix

and two ^ S ^ e ^ ^ gen, 41 abutting stigt, which on the inside de ^ anm ^

and as ^^ »" ^^ SSSureh the

31 serves ^ P ^^^^ SXlm 31. part of house 40 in front of the Ruckstobenaes ^ «n

The the movement of ^{the an} ^ ^r ^ f

The working winding 11 encloses a plunger 31, which forms an extension of its

^l _e ^e ^ ^t _{it low} weight of as a small "η _Arbeitsw ick-

End projects beyond the end face of the ^saw Naglergehauses 30 ^'is g · and is hingedly gekup- with a driving ram 35 D. all JJ

pelt, who picked out a nail on the working stroke of the Nagle

the magnet system existing Rah _also

Is used for the diffraction of the switch 14, a finger lever 38. the upper resilient connecting link

leichl at the

im _{still ei "e}

Oesu ™

Sd ^ S ^^ d ^ rS

tend sta.ken current impulse the armature 31 abruptly «star It can also ^ der

The work winding 11 is formed from a strong 50 stapling device, such as

1 sheet of drawings

Claims (9)

Patent claims: 1. Nagler with driven by the armature of an electromagnet driving ram, whose Work winding during a nail or the like. Driving stroke over a this triggering switch is connected to the discharge circuit of a capacitor, the is disconnected from the working winding during charging and connected to an alternating current network, according to patent 2141776, characterized in, that the magnet system (11, 31) is arranged in a frame (41) of a part (40) of the nailer housing (26) is enclosed and this from the mechanical Forces of the magnet system relieved. 2. Nailer according to claim 1, characterized in that the frame (41) made of ferromagnetic Material, in particular sheet iron, is made. 3. Nailer according to claim 1, characterized in that the working winding (11) between two in the frame (41) inserted cross pieces (43, 45) is arranged, which provide a guide for the armature (31) and its extension pin (32) form. 4. Nailer according to claim 3, characterized in that on the upper crosspiece (45) one the recoil of the armature (31) absorbing cover plate (48) is attached. 5. nailer according to claim 1, characterized in that the working winding (11) made of aluminum consists. 6. nailer according to claim 5, characterized in that the working winding (11) consists of a oxidized aluminum foil is wrapped. 7. nailer according to claim 1, characterized in that an armature (31) extending and on a lever (33) of the driving ram (35) resting pin (32) made of antimagnetic material consists. 8. nailer according to claim 7, characterized in that the pin (32) made of a nickel-manganese steel alloy consists. 9. nailer according to claim 7, characterized in that the on the lever (33) abutting the lower end of the pin (32) is provided with a hardened insert (49).