Radio detector for detecting dull and broken tools

• US 4,090,802 A
• Filed: 12/27/1976
• Issued: 05/23/1978
• Est. Priority Date: 12/27/1976
• Status: Expired due to Term

• Current Assignee: Otto Bilz Werkzeugfabrik
• Original Assignee: Otto Bilz Werkzeugfabrik
• Inventors: Bilz, Reiner
• Primary Examiner(s): Vlachos, Leonidas
• Application Number:
  US05/754,367
• Time in Patent Office: 512 Days
• Field of Search: 408/6, 408/16, 408/9, 408/11, 408/710, 408/711
• US Class Current: 408/6
• CPC Class Codes: B23B 49/001 Devices for detecting or indicating failure of drills
• CPC Class Codes: B23Q 1/0009 Energy-transferring means or control lines for movable machine parts; Control panels or boxes; Control parts control handles for driving or feeding mechanisms B23Q5/54
• CPC Class Codes: B23Q 11/04 Arrangements preventing overload of tools, e.g. restricting load
• CPC Class Codes: F16D 7/06 with intermediate balls or rollers
• CPC Class Codes: Y10T 408/14 Responsive to condition of Tool or tool-drive
• CPC Class Codes: Y10T 408/165 to control Tool rotation
• CPC Class Codes: Y10T 408/172 Responsive to Tool
• CPC Class Codes: Y10T 408/21 with signal, indicator, illuminator or optical means

Abstract

A chuck unit for boring, drilling or cutting tools having a safety clutch so as to prevent overload resulting from broken or dull tools and wherein when the clutch is actuated by an overload a transmitter in the tool support is actuated to radiate a signal which is detected by a receiver so as to indicate the malfunction and/or stop the tool so as to prevent damage to the tool or workpiece.

Claims

1. A device for preventing overload of an axially loaded tool comprising, a tool supporting member for receiving a tool in one end and adapted to be received into a motor driven chuck at its other end, said tool supporting member formed of first and second parts, an overload clutch mounted between said first and second parts such that when overload occurs said first and second parts move toward each other to shorten said tool supporting member, a radiant energy transmitter connected to said tool supporting member and actuated when said first and second parts move toward each other, and wherein said tool supporting member is hollow and said transmitter is mounted therein, and an antenna mounted to said tool supporting member and electrically connected to said transmitter.

2. A device for preventing overload according to claim 1 wherein said transmitter is supported within said first part, a switching means connected to said transmitter, and said switching means actuated when said first and second parts move toward each other during overload conditions.

3. A device for preventing overload according to claim 2, wherein said switching means includes a magnetically operated switch connected to said transmitter and a magnet connected to said second part and moveable to actuate said magnetically operated switch during overload conditions.

4. A device for preventing overload according to claim 3, wherein said magnetically operated switch is a reed switch.

5. A device for preventing overload according to claim 4 including a potentiometer mounted between the output of said transmitter and said antenna.

6. A device for preventing overload according to claim 1 including a radiant energy receiver mounted so as to receive and detect radiant energy radiated from said transmitter and including output means responsive to radiant energy from said transmitter.

7. A device for preventing overload according to claim 6 wherein said output means is an indicator.

8. A device for preventing overload according to claim 6, wherein said output means is connected to control the motor of said motor driven chuck to stop said chuck when overload occurs.

9. A device for preventing overload of an axially loaded tool comprising, a first tool supporting member for receiving a tool in one end and adapted to be received into a motor driven chuck at its other end, said first tool supporting member formed of first and second parts, an overload clutch mounted between said first and second parts such that when overload occurs said first and second parts move toward each other to shorten said tool supporting member, a radiant energy transmitter connected to said first tool supporting member and actuated when said first and second parts move toward each other, further including a plurality of additional tool supporting members each including tools, radiant energy transmitters and overload clutches which energize said transmitters during overload, receiving means for receiving radiation from said transmitters, and wherein certain of said transmitters radiate different signals and said receiver means includes portions responsive to said different signals to detect and respond to signals from particular transmitters.

10. A device according to claim 9, wherein more than one transmitter radiates energy at the same frequency and said receiver responsive to said frequency.