File:Design of a universal portable electric drill (1920) (14758480096).jpg

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Identifier: designofuniversa00conn (find matches)
Title: Design of a universal portable electric drill
Year: 1920 (1920s)
Authors: Connell, Edwin Lewis
Subjects: Electric drills Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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6to .37 JlP maximum must be attributed to the superiority of thenew design. The na,/ tool weighs the seme as the old one, 20f-pounds. All perfoimance data on alternating current is made onthe basis of 60 cycles frequency which is the highest frequencyfor which the tool is recommended. On lower frequencies the al-terna-ting current perfoimance would, of course, approach moreclosely the direct current perfoimance. 2. PATEIIT STATUS The patent status of this motor is very important in viev/ ofthe present litigation over the Burke patent. The use of thedivided pole to intdrjduce a reluctance into the path of the arma-ture flux has been knovm for sane time. This feature is concededby patent attorneys to be covered by Kudolf i^iickemeyer s patenti^o. 664733 which expired in 1917. Thus far Jiurke has had nosuccess in collecting damages from manufacturers of the salientpole ty-pe of universal motor but pmding court settlement ananalysis of the patent and a conclusion bared thereon is our only
Text Appearing After Image:
U. OF 1. S. S. FORM 3 60 means of giving the patent status of the motor described. An analysis of the ten claims of the -i^urke patent shows thatthere are seven features appearing v/ith slight variations in tencombinations. CLfilM I. in a commutator type of electric motor, the combinationof (aj A TOUlHSD STATOR xiAVIi^U A //lL^lj3IlJ(:r PRUDUGIMQ DI^THIBUTEDjeOLj^S. (bj .VI.11 IMEKVi!;iailU TEETH 02 lEUTRAL POLAHITl and (c) AliARIvIriTUiiE connected in series v/ith the winding of the stator andHAVIlJi; A MUCH GREATEH I^IUMhEH OF TUKlJo, (d) THE AHI.IATURE y/IiroilTGBEING INGLIIJED TO THE ^RI^ATUHE AXIS, a commutator rmdi (ej BRUSiH^SDISPLACED A L.^RGE A^IOUUT BACK OF TuE NEUTRAL POSITION TO A POIirT;YHERE the SPEED CURVES UNDER APPLIED ALTERNATING OR DI?J£CT CUR-RENT THE SAI^ VOLTAGE APPROACH COINCIDENCE, v/hereby the motor ay be operated efficiently under alternating or direct currentof the same voltage. CLAIM 2. In an electric motor for altematirig or direct current,the combination

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https://www.flickr.com/photos/internetarchivebookimages/14758480096/

Author Connell, Edwin Lewis
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Flickr tags
InfoField
  • bookid:designofuniversa00conn
  • bookyear:1920
  • bookdecade:1920
  • bookcentury:1900
  • bookauthor:Connell__Edwin_Lewis
  • booksubject:Electric_drills
  • booksubject:Theses
  • bookcontributor:University_of_Illinois_Urbana_Champaign
  • booksponsor:University_of_Illinois_Urbana_Champaign
  • bookleafnumber:132
  • bookcollection:university_of_illinois_urbana-champaign
  • bookcollection:americana
Flickr posted date
InfoField
30 July 2014


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