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Paper shredder with switch-off retardation

  • US 5,167,374 A
  • Filed: 02/07/1992
  • Issued: 12/01/1992
  • Est. Priority Date: 02/09/1991
  • Status: Expired due to Fees
First Claim
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1. A paper shredder, comprising:

  • a housing;

    means in said housing forming a paper-feed shaft for paper to be shredded and having a mouth into which paper to be shredded is insertable and an outlet end;

    shredding means in said housing juxtaposed with said outlet end of said shaft for comminuting paper discharged through said outlet end;

    a switch in said housing electrically connected to said shredding means for turning said shredding means on and off;

    a paper sensor positioned along said shaft and actuatable by the insertion of paper into said shaft, said paper sensor being operatively connected to said switch for actuating same; and

    a switch-off retarder operatively connected to said sensor for delaying turn-off of said shredding means after said sensor is disengaged by paper traversing said shaft, said retarder comprisinga cylinder in said housing formed with a venting valve and means forming an air-bleed inlet, anda piston reciprocatable in said cylinder and so connected to said sensor that actuation of said sensor by insertion of paper into said shaft displaces said piston in said cylinder from a starting position and discharges air through said valve, said piston returning slowly to said starting position upon bleeding of air into said cylinder through said air-bleed inlet, thereby enabling said sensor to operate said switch to turn off said shredding means.

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