Patent ID: 9649770
Date: 2017-05-16
CPC Classifications: B25J,B65G,B66C,H01F

Claim:
1. A magnetic holding device comprising: a receptacle including a chamber formed therein and defined by an outer peripheral fence, an upper fence, and a bottom portion, an attracting device supported in said chamber of said receptacle and spaced from said bottom portion of said receptacle for forming a space between said bottom portion of said receptacle and said attracting device, a shielding device including a non-shielding element and a magnetic shielding member provided thereon and slidable and moveable through the space that is formed between said bottom portion of said receptacle and said attracting device, a driving device supported in said chamber of said receptacle and coupled to said shielding device for moving said shielding device through the space that is formed between said bottom portion of said receptacle and said attracting device, said driving device including a first pulley, said receptacle including a first spindle rotatably supported in said chamber of said receptacle and engaged with said shielding device, and said driving device including a second pulley attached to said first spindle and rotated in concert with said first spindle, and said second pulley being connected to said first pulley with a coupling device for allowing said first spindle to be rotated and driven relative to said receptacle by said driving device, and said attracting device being capable of attracting a work piece when said non-shielding element of said shielding device is located between said bottom portion of said receptacle and said attracting device, and said attracting device being shielded and prevented from attracting said work piece when said magnetic shielding member of said shielding device is located between said bottom portion of said receptacle and said attracting device.