发明名称 |
BOHRMASCHINE MIT MAGNETFUSS MIT BOHRUNTERBRECHUNG BEIM ABHEBEN DES MAGNETFUSSES |
摘要 |
A drill apparatus with an electromagnet base, which has an electric drill directed downwards, is provided with an electromagnet base having an electromagnet for attaching the apparatus to a to-be-worked object by magnetic force. The electric drill is rotated by a drill motor and moved by a feed motor towards the object. A Hall element is situated on the electromagnet base. Two comparators detects whether or not a Hall voltage output from the Hall element falls in a predetermined range of voltage values. When the Hall voltage does not fall in this range, a transistor is turned on. Consequently, a relay is operated, a contact is opened, and power supply to the drill motor and the feed motor is stopped. |
申请公布号 |
DE4102201(A1) |
申请公布日期 |
1991.10.31 |
申请号 |
DE19914102201 |
申请日期 |
1991.01.25 |
申请人 |
NITTO KOHKI CO., LTD., TOKIO/TOKYO, JP |
发明人 |
SHOJI, MICHIHIRO, OOTA, TOKYO/TOKIO, JP |
分类号 |
B23B39/14;B23B41/00;B23B45/14;B23B47/24;B25H1/00;H01F7/20 |
主分类号 |
B23B39/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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