US3766455A - Electromagnetically operated stapler - Google Patents

Electromagnetically operated stapler Download PDF

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Publication number
US3766455A
US3766455A US3318-135*7A US3766455DA US3766455A US 3766455 A US3766455 A US 3766455A US 3766455D A US3766455D A US 3766455DA US 3766455 A US3766455 A US 3766455A
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US
United States
Prior art keywords
tool
housing
winding
capacitor
tool according
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 - Lifetime
Application number
US3318-135*7A
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English (en)
Inventor
C Zakrewsky
W Taubken
E Muller
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.)
ERWIN MULLER DT
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Individual
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Filing date
Publication date
Priority claimed from DE19712141776 external-priority patent/DE2141776C/de
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3766455A publication Critical patent/US3766455A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B25C1/06—Hand-held nailing tools; Nail feeding devices operated by electric power

Definitions

  • ABSTRACT The operating winding of an electromagnetically operated stapler is in the period of time during the working stroke connected with a capacitor the discharge cur rent of which energizes said winding with a strong current surge whereby a high impact power for'driving staples into a work piece is achieved. During the charging period the capacitor is separated from said winding and joined to an alternating current source.
  • PATENTEDUDT 16 I973 3,766L455 sum 2 or 2 1 ELECTROMAGNETICALLY OPERATED STAPLER DESCRIPTION OF THE INVENTION
  • the invention relates to an electromagnetically operated tool and, more particularly, to an electromagnetically operated stapler for driving fastener means such as staples, nails or similar means into a work piece. It is desirable to complete the operation performed by such tools in a single power stroke rather than to apply repeated blows to the staple, nail or other fastening means. This necessitates with electromagnetically operated tools a large induced magnetic field acting on an armature of the operating winding in order to deliver a sufficient amount of output power.
  • Another object is to provide an electromagnetically operated tool that is capable of delivering a highly output power.
  • a further object is to provide a portable tool which is easy to manipulate and is protected from heavy mechanical stress.
  • one embodiment of the invention comprises an electromagnetically operated stapler or fastener the operating winding of which during the working stroke for driving a nail or similar fastening means into a work piece by a changeover switch starting the working stroke is connected to the discharge current circuit of a capacitor which is disconnected from the operating winding during charging and connected to an alternating current mains.
  • Thisdischarge current may assume a considerable value depending on the capacity of the capacitor; it occurs only during a very short span of time such that the operating winding receives, all of a sudden, a strong energizing current and develops a magnetic field of corresponding magnitude. This field then transmits on the armature of the operating winding a large mechanical power so as to provide a high impact effect.
  • the changeover switch is constructed as a manually actuated switch which in its position of rest has the charging circuit of the capacitor connected to the mains. When a working stroke is to be operated the changeover switch is actuated whereby the capacitor is connected to the operating winding and is discharged.
  • the capacitor may either be mounted within the housing of the device which is preferable especially for stationary devices.
  • the capacitor may be mounted within the supply line or directly within the mains plug resulting in a particularly light weight structure for the electromagnetic hand tool.
  • the weight must be as small as possible so as to permit easy handling.
  • the stapler housing is often made of thin sheets of light metal or of plastic material and is consequently heavily stressed during every working stroke by the impacting and recoil action taking place.
  • the armature of the electromagnet is designed as a plunger type armature communicating via' a prolonging pin in force transmitting relationship with a lever pivotally mounted at its rear end portion on an axis of the stapler housing, the anterior end of which lever being coupled to the driver.
  • this pin is made of an antimagnetic material, e.g., of nickel-manganese steel.
  • the end of said pin abutting the lever may preferably be provided with a hardened insert so as to prevent, to a large extent, exposure to wear and tear.
  • FIG. 1 is a schematic circuit diagram of an embodiment of the invention
  • FIG. 2 is an elevational sectional view of a portable stapler embodying the present invention.
  • FIG. 3 is a cross sectional view taken on the line III- III of FIG. 2.
  • the operating winding 11 of an electromagnetically operated stapler has one end connected via a conductor 12 to the fixed contact 13 of a changeover switch 14, the opposite contact 15 of which is connected via a diode 16 and an Ohmic resistance 17 and a conductor 18 to one pole 19 of a monophase alternating current mains 20.
  • the other end of the operating winding 11 is connected to the other pole 21 of the alternating current mains via conductor 22 to which the negative pole of a capacitor 23 preferably of the electrolyte type commonly employed in photoflash lamps is also joined.
  • the positive pole of the capacitor 23 is joined to the center contact 24 of the change-over switch 14.
  • a quenching resistance 25 is connected parallel to the capacitor 23 which is discharged by said quenching resistance 25 when the capacitor 23 is disconnected from the mains 20.
  • FIGS. 2 and 3 The constructive development of this electromagnetically operated stapler according to the invention is illustrated in FIGS. 2 and 3.
  • the operating winding 11 is mounted in the housing 26 composed of plastic material.
  • the hollow housing 26 is provided with a hollow handle 27 and encloses the changeover switch 14 together with its contacts 13, 15 and 24 as well as the diode 16, the conductors 12, 18, 22 and an earth connection 28. These conductors are united to form a cable 29 and are ending in a plug 30 to be connected to both poles 19 and 21 of the alternating current mains 20, and which plug contains the capacitor 23, the charging resistance 17 and the quenching resistance 25.
  • the frontal portion 40 of the housing 26 encloses the electromagnetic drive.
  • the cylindrical operating winding 11 of which comprises a plunger type armature 31 connected in power transmitting relationship via a pin 32 to a one-armed lever 33.
  • This lever is pivotally mounted at its rear end onto an axis 34 of the housing 26.
  • the front end portion of the lever 33 projects beyond the front face of the housing 26 and is flexibly coupled with a drive 35 which during the working stroke drives a staple (not shown) from a magazine 36 into a work piece.
  • the lever 33 is maintained by means of a torsion spring 37 in its initial position illustrated in FIG. 2 of the drawings.
  • the change-over switch 14 is actuated by a fingertype lever 38 which pivots the center contact 24 of the changeover switch 14 via a resilient link member 39 from the position of rest shown in the drawings in upward direction until the contacts 24 and 13 are closed, whereby the capacitor 23 is discharged via the operating winding 11.
  • the strong surge current occuring at this instant energizes the operating winding 11 and causes it to attract its armature 31 immediately, leading the lever 33 to move the driver 35 downwardly and drives a staple from the magazine 36 into the work piece with great force so that even large and long staples and nails are driven but with a single stroke.
  • the operating winding 1 1 is supported by a frame 41 made of strong iron sheets.
  • the prismatic front portion of the stapler housing 26 encloses the frame 4,1, the inner side of which has an insert 42 mounted thereon, e.g., welded thereto, to which a crosspiece 43 has been fixedly secured.
  • the operating winding 11 rests over an interposed insulating sleeve 44 on said insert 42 as well as on the crosspiece 43 and is clamped by means of an upper crosspiece 45.
  • the lower crosspiece 43 is formed as a guide for the pin 32 being an extension of armature 31 while the upper crosspiece 45 provides guidance for the armature 31.
  • a cover plate 48 is secured to the crosspiece 45.
  • This cover plate 48 abuts the inner side wall of the frame 41 and serves as a strike plate for the return-stroke of the armature 31. Additionally, the cover plate 48 protects the housing portion 40 in this manner against the recoiling action of the armature 31.
  • the pin 32 transmitting the movement of armature 31 onto lever 33 is composed of non-magnetic material, e.g., of a nickel-manganese-steel alloy and carries on its lower end portion a hardened insert 49 resting on lever 33 and serving as protection against wear and tear.
  • the stapler constructed so as to be portable and have little weight has its operating winding 11 wound of oxidized aluminium foil which is resistant even to overheating on account of the insulating qualities of the oxide coating.
  • a rip 50 is secured which rip covers the driver 35 and its guide portion 51.
  • the housing portion 40 is closed off on its front and rear side by a cover plate 52 for each side.
  • cover plates are connected by means of screws and bolts to the housing portion 40 so as to permit easy access to the magnetic system.
  • the handle 27 may be provided with a protective covering 53.
  • An embodiment of the electromagnetically operated means as described may also be used with stationary staplers, e.g., with staplers, nailing or block stitching means or similar of the bench or table type.
  • an electromagnetically operated tool adapted to be energized by an alternating current potential source and controlled to provide a single power stroke
  • a housing winding means disposed in the housing, magnetically actuating means movably arranged adjacent the winding means, a manually actuated switch means carried by the housing and adapted to be joined to said winding means for initiation a working stroke of the tool, a capacitor means with one pole connected to said switch means and with the other pole connected to said alternating current potential source, and means controlled by actuation of said switch means for energizing said winding means by the discharge current of said capacitor means and separating said capacitor means from said alternating current potential source.
  • capacitor means comprise an electrolytic condenser.
  • winding means is mounted between two crosspieces inserted in said frame, which crosspieces form a guide for the armature and an extension pin of said armature, which extension pin is adjacent the magnetically actuating means.
  • the frame is made of ferromagnetic material, particularly sheet iron.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US3318-135*7A 1971-08-20 1972-08-09 Electromagnetically operated stapler Expired - Lifetime US3766455A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19712141776 DE2141776C (de) 1971-08-20 Nagler mit von dem Anker eines Elek tromagneten angetriebenem Eintreibstoßel
DE2226788A DE2226788C2 (de) 1971-08-20 1972-06-02 Nagler mit von dem Anker eines Elektromagneten angetriebenem Eintreibstößel

Publications (1)

Publication Number Publication Date
US3766455A true US3766455A (en) 1973-10-16

Family

ID=25761625

Family Applications (1)

Application Number Title Priority Date Filing Date
US3318-135*7A Expired - Lifetime US3766455A (en) 1971-08-20 1972-08-09 Electromagnetically operated stapler

Country Status (8)

Country Link
US (1) US3766455A (enExample)
JP (1) JPS4835470A (enExample)
CA (1) CA953353A (enExample)
DE (1) DE2226788C2 (enExample)
ES (1) ES405869A1 (enExample)
FR (1) FR2151286A5 (enExample)
IT (1) IT964113B (enExample)
SE (1) SE398833B (enExample)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215297A (en) * 1976-06-28 1980-07-29 Georges Jacquemet Electromagnetic percussion appliance
US4349143A (en) * 1980-05-12 1982-09-14 Parker Manufacturing Co. Electric stapler and driver assembly therefor
US4556803A (en) * 1984-02-29 1985-12-03 Electro-Matic Staplers, Inc. Trigger switch circuit for solenoid-actuated electric hand tool
US6135337A (en) * 1999-01-15 2000-10-24 Hunt Holdings, Inc. Electric stapler
US6246131B1 (en) * 1999-12-07 2001-06-12 Chih-Sheng Sheng Magnetic power apparatus
US20030183670A1 (en) * 2000-08-25 2003-10-02 Barber John P. Impact device
US6857549B1 (en) * 2003-11-21 2005-02-22 Navtor Technology Corporation Nail driving gun with a shock-absorbing member
US20140130365A1 (en) * 2012-11-13 2014-05-15 Kristine M. Dineen Multiple purpose hair dryer
US20170105734A1 (en) * 2015-10-16 2017-04-20 Tsung-Wen Huang Staples push unit for tackers
US20210170559A1 (en) * 2018-06-06 2021-06-10 Hilti Aktiengesellschaft Setting tool
US20210237244A1 (en) * 2018-06-06 2021-08-05 Hilti Aktiengesellschaft Setting tool
US20210237243A1 (en) * 2018-06-06 2021-08-05 Hilti Aktiengesellschaft Fastener driving tool
US11712792B2 (en) * 2018-06-06 2023-08-01 Hilti Aktiengesellschaft Setting tool

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57132976A (en) * 1981-02-13 1982-08-17 Max Co Ltd Striking tool
DE3444015A1 (de) * 1984-12-03 1986-06-05 Robert Bosch Gmbh, 7000 Stuttgart Batteriebetriebenes nagel- oder klammergeraet
CA2252691C (en) 1997-11-07 2005-12-06 Kyowa Hakko Kogyo Co., Ltd. Protein-containing acidic foods and drinks

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1940692A (en) * 1933-12-26 Electric
US3179866A (en) * 1961-12-22 1965-04-20 Fastener Corp Electromagnetically operated tool
US3345546A (en) * 1964-07-20 1967-10-03 Michigan Bank Nat Ass Electric stapler and stapler trigger circuit
US3346163A (en) * 1965-10-22 1967-10-10 Fed Tool Engineering Co Automatic electric stapler
US3347441A (en) * 1965-11-24 1967-10-17 Electric Stapler Corp Electric fastening tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1940692A (en) * 1933-12-26 Electric
US3179866A (en) * 1961-12-22 1965-04-20 Fastener Corp Electromagnetically operated tool
US3345546A (en) * 1964-07-20 1967-10-03 Michigan Bank Nat Ass Electric stapler and stapler trigger circuit
US3346163A (en) * 1965-10-22 1967-10-10 Fed Tool Engineering Co Automatic electric stapler
US3347441A (en) * 1965-11-24 1967-10-17 Electric Stapler Corp Electric fastening tool

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215297A (en) * 1976-06-28 1980-07-29 Georges Jacquemet Electromagnetic percussion appliance
US4349143A (en) * 1980-05-12 1982-09-14 Parker Manufacturing Co. Electric stapler and driver assembly therefor
US4556803A (en) * 1984-02-29 1985-12-03 Electro-Matic Staplers, Inc. Trigger switch circuit for solenoid-actuated electric hand tool
US6135337A (en) * 1999-01-15 2000-10-24 Hunt Holdings, Inc. Electric stapler
US6246131B1 (en) * 1999-12-07 2001-06-12 Chih-Sheng Sheng Magnetic power apparatus
US20030183670A1 (en) * 2000-08-25 2003-10-02 Barber John P. Impact device
US6830173B2 (en) 2000-08-25 2004-12-14 Senco Products, Inc. Impact device
US6857549B1 (en) * 2003-11-21 2005-02-22 Navtor Technology Corporation Nail driving gun with a shock-absorbing member
US20140130365A1 (en) * 2012-11-13 2014-05-15 Kristine M. Dineen Multiple purpose hair dryer
US20170105734A1 (en) * 2015-10-16 2017-04-20 Tsung-Wen Huang Staples push unit for tackers
US10004503B2 (en) * 2015-10-16 2018-06-26 Tsung-Wen Huang Staples push unit for tackers
US20210170559A1 (en) * 2018-06-06 2021-06-10 Hilti Aktiengesellschaft Setting tool
US20210237244A1 (en) * 2018-06-06 2021-08-05 Hilti Aktiengesellschaft Setting tool
US20210237243A1 (en) * 2018-06-06 2021-08-05 Hilti Aktiengesellschaft Fastener driving tool
US11590640B2 (en) * 2018-06-06 2023-02-28 Hilti Aktiengesellschaft Setting tool
US11667022B2 (en) * 2018-06-06 2023-06-06 Hilti Aktiengesellschaft Fastener driving tool
US11712792B2 (en) * 2018-06-06 2023-08-01 Hilti Aktiengesellschaft Setting tool
US12059785B2 (en) * 2018-06-06 2024-08-13 Hilti Aktiengesellschaft Setting tool

Also Published As

Publication number Publication date
DE2226788B1 (de) 1973-10-18
SE398833B (sv) 1978-01-23
DE2141776B2 (de) 1972-12-07
IT964113B (it) 1974-01-21
DE2141776A1 (enExample) 1972-12-07
ES405869A1 (es) 1976-01-16
FR2151286A5 (enExample) 1973-04-13
JPS4835470A (enExample) 1973-05-24
CA953353A (en) 1974-08-20
DE2226788A1 (enExample) 1973-10-18
DE2226788C2 (de) 1974-05-22

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