Browse Prior Art Database

Tool Holder Assembly

IP.com Disclosure Number: IPCOM000091440D
Original Publication Date: 1968-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Ditson, JA: AUTHOR

Abstract

Tool assembly 10 comprises rotor 11 with cylindrical recess 12 for receiving collet 13 which holds shank 14 of a tool such as a drill. Collet 13, which is assembled as a unit within recess 12, comprises collapsible cylindrical sleeve 15 fixedly attached at opposite ends to spaced cylindrical collet blocks 16 and 17. Aperture 18 in block 17 is in alignment with recess 19 in the front surface of block 16 for receiving shank 14 of the drill. Air-flow channel 20 in rotor 11 connects through radial channel 21 and longitudinal channels 22 and 23 in block 16 to circumferential pressure chamber 24 concentric with sleeve 15. Sleeve 15 is formed of polyurethane material and is slightly collapsed so that there is an initial frictional engagement with shank 14 upon insertion while pressure is not applied.

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Tool Holder Assembly

Tool assembly 10 comprises rotor 11 with cylindrical recess 12 for receiving collet 13 which holds shank 14 of a tool such as a drill. Collet 13, which is assembled as a unit within recess 12, comprises collapsible cylindrical sleeve 15 fixedly attached at opposite ends to spaced cylindrical collet blocks 16 and 17. Aperture 18 in block 17 is in alignment with recess 19 in the front surface of block 16 for receiving shank 14 of the drill. Air-flow channel 20 in rotor 11 connects through radial channel 21 and longitudinal channels 22 and 23 in block 16 to circumferential pressure chamber 24 concentric with sleeve 15. Sleeve 15 is formed of polyurethane material and is slightly collapsed so that there is an initial frictional engagement with shank 14 upon insertion while pressure is not applied. When pressure is applied to chamber 24, from channels 20...23, sleeve 15 collapses to firmly grip shank 14 thus enabling the drill to be operated without any rotational lippage at any speed.

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